RLR05C1004GRBSL19

The RLR05C1004GRBSL19 from Vishay Dale is a 1 megohm through-hole metal film resistor designed to meet stringent military specifications under MIL-PRF-39017/05. This axial-lead component delivers 2% tolerance and 0.125W power dissipation, positioning it for applications where controlled resistance performance and environmental reliability intersect with space-constrained circuit layouts.

Built on metal film technology, this resistor achieves tight tolerance characteristics while maintaining a temperature coefficient of ±100ppm/°C across its -65°C to 150°C operating range. The metal film construction provides stable resistance behavior under thermal cycling and sustained exposure to varying environmental conditions, making it suitable for instrumentation circuits, precision voltage dividers, and bias networks in analog signal conditioning stages.

The military-grade designation encompasses moisture resistance and weldable terminations, addressing requirements in sealed enclosures, high-humidity environments, and systems subjected to repeated thermal stress. Weldable leads support direct attachment methods in assemblies where mechanical robustness outweighs the flexibility of solder joints, particularly in vibration-prone installations or high-reliability systems with extended service life expectations.

Physical dimensions of 0.066" diameter by 0.150" length (1.68mm x 3.81mm) enable integration into compact printed circuit board layouts while maintaining adequate spacing for voltage isolation and thermal management. The axial package with two terminations allows both horizontal and vertical mounting orientations, providing layout flexibility in mixed-technology boards that combine through-hole and surface-mount components.

With a failure rate specification of R level (0.01%), this component targets systems where resistance drift or open-circuit failures would compromise operational integrity. This reliability classification aligns with long-term deployment scenarios in industrial control systems, aerospace instrumentation, and telecommunications infrastructure where field replacement costs justify upfront component selection based on predicted lifetime performance.

The 1 megohm resistance value serves high-impedance measurement circuits, sensor interface stages, and isolation networks where leakage current minimization and signal path impedance management directly affect measurement accuracy. In feedback networks for operational amplifiers or reference voltage dividers for analog-to-digital converters, the 2% tolerance supports initial calibration margins while the low temperature coefficient maintains performance across operating temperature excursions.

Bulk packaging indicates volume procurement pathways for production runs where tray or tape-and-reel handling automation is not required. This packaging approach suits prototyping phases, low-to-medium volume manufacturing, and field service inventories where component handling flexibility outweighs automated placement infrastructure.

RLR05C1004GRBSL19 (1)

Finding Reliable Alternatives for Military-Grade 1M Ohm Through-Hole Resistors

Design engineers working with military or high-reliability applications often encounter situations where direct procurement of specified components becomes challenging due to lead times, minimum order quantities, or lifecycle transitions. The Vishay Dale RLR05C1004GRBSL19 represents a military-qualified metal film resistor with specific performance characteristics that must be preserved when considering alternatives. This 1 MOhm, ±2%, 1/8W axial resistor meets MIL-PRF-39017/05 standards and incorporates moisture resistance with weldable terminations—features particularly relevant in defense, aerospace, and industrial control systems operating across extended temperature ranges.

When sourcing replacement components for this resistor, several alternatives warrant evaluation: the RLR05C1004GRB14 RLR05C1004GRB14 Vishay Dale RES 1M OHM 2% 1/8W AXIAL 6252 from the same manufacturer series, commercial-grade equivalents like the CMF551M0BETR or CCF071M00FKE36, and functionally similar options such as the MBB02070C1004FCT00 MBB02070C1004FCT00 Vishay Beyschlag/Draloric/BC Components RES 1M OHM 0.6W 1% AXIAL 17967 or RN55D1004FB14 RN55D1004FB14 Vishay Dale RES 1M OHM 1/8W 1% AXIAL 5100 . Each presents distinct tradeoffs in qualification status, physical dimensions, and procurement logistics that influence their suitability for specific applications.

Understanding the RLR05C1004GRBSL19 Specification Framework

The RLR05 series designation indicates compliance with MIL-PRF-39017/05, a specification governing established reliability metal film fixed resistors for space-level applications. The 1 MOhm resistance value combined with 2% tolerance places this component in a precision category suitable for voltage dividers, bias networks, and high-impedance sensing circuits. The 0.125W power rating at 70°C ambient allows approximately 350V maximum applied voltage under steady-state conditions, assuming resistive load derating.

The ±100ppm/°C temperature coefficient ensures resistance drift remains within 2.15% over the full -65°C to 150°C operating range—a performance level necessary for maintaining circuit accuracy in unconditioned environments. The moisture resistance feature addresses applications exposed to humidity cycling or storage in uncontrolled conditions, while weldable terminations support automated assembly processes in high-reliability manufacturing. The 0.01% failure rate classification (R level per MIL-STD-690) corresponds to approximately 100 FIT, establishing baseline reliability expectations.

Direct Series Alternative: RLR05C1004GRB14

The RLR05C1004GRB14 RLR05C1004GRB14 Vishay Dale RES 1M OHM 2% 1/8W AXIAL 6252 represents the most straightforward replacement path, sharing the identical base part number structure within the RLR05 series. This variant maintains the same 1 MOhm resistance, 2% tolerance, and MIL-PRF-39017/05 qualification status. The primary differentiation lies in the suffix code, which typically denotes packaging configuration, lead finish variation, or production lot qualification details rather than fundamental electrical parameters.

Both variants utilize the same 0.066" diameter by 0.150" body dimensions and metal film construction, ensuring mechanical interchangeability in existing PCB layouts or point-to-point wiring assemblies. The temperature coefficient, power rating, and environmental specifications remain identical, eliminating the need for circuit performance revalidation. This alternative proves most suitable when the original part number encounters temporary availability constraints but the application requires maintained qualification documentation and traceability to military specifications.

The procurement consideration centers on supplier-specific packaging codes—the GRB14 suffix may indicate bulk packaging with specific lead forming or tape-and-reel options that differ from the GRBSL19 variant. Verification of lead length, forming radius, and termination plating composition should precede large-volume orders to confirm compatibility with existing assembly tooling.

Commercial-Grade Metal Film Option: Vishay Dale CMF55 Series

The CMF551M0BETR offers a commercial-grade alternative manufactured by the same vendor, eliminating military qualification overhead while maintaining metal film construction. This 1 MOhm, ±0.1%, 1/4W resistor provides tighter tolerance than the RLR05 series, potentially benefiting precision applications where the 2% original tolerance represented conservative design margin. The increased power rating to 0.25W doubles thermal capacity, though the larger physical envelope (0.098" diameter by 0.350" length) requires PCB layout accommodation.

The temperature coefficient specification of ±50ppm/°C represents improved stability compared to the RLR05's ±100ppm/°C, reducing resistance drift to approximately 1.075% across a similar temperature range. However, the commercial qualification omits moisture resistance coatings and reduces the operating temperature range to -55°C to 155°C. Applications in environmentally controlled equipment enclosures or commercial instrumentation may accept these tradeoffs in exchange for broader distribution availability and lower unit costs.

This substitution requires evaluation of the relaxed environmental specifications against operational conditions. Equipment experiencing condensation cycles, salt spray exposure, or extended storage in uncontrolled environments should retain military-qualified components. Conversely, designs with controlled thermal environments and humidity management may benefit from the improved electrical tolerance without requiring MIL-PRF qualification documentation.

Cross-Manufacturer Alternative: Yageo MBB02070C1004FCT00

The Yageo MBB02070 series represents a cross-manufacturer option targeting similar application spaces with distinct construction methodology. This 1 MOhm, ±1%, 0.6W resistor employs metal oxide film technology rather than pure metal film, offering enhanced pulse handling capability and moisture resistance through alternative material chemistry. The physical dimensions (0.089" diameter by 0.350" length) fall between the RLR05 and CMF55 specifications, potentially fitting existing layouts depending on lead spacing constraints.

The 1% tolerance specification tightens initial accuracy requirements compared to the original 2%, while the ±100ppm/°C temperature coefficient matches the RLR05 performance. The increased power rating to 0.6W significantly expands thermal design margin, allowing operation at higher ambient temperatures or accommodating transient voltage spikes common in inductive load circuits. However, this alternative lacks explicit MIL-PRF-39017 qualification, limiting applicability in defense or aerospace programs requiring documented compliance to military specifications.

Metal oxide film construction provides inherent advantages in high-voltage, high-frequency applications where pure metal film resistors may exhibit voltage coefficient effects or parasitic reactance. The material structure tolerates moisture ingress more effectively than uncoated metal film, though it does not replace the formal moisture resistance qualification present in the RLR05 series. Selection of this alternative suits commercial high-reliability applications where performance characteristics matter more than procurement specification compliance.

Precision Commercial Equivalent: Vishay Beyschlag CCF071M00FKE36

The CCF07 series from Vishay Beyschlag addresses applications prioritizing physical compactness and tighter tolerance over military qualification. This 1 MOhm, ±1%, 0.25W resistor measures 0.079" diameter by 0.138" length—slightly shorter than the RLR05 while maintaining similar diameter. The metal film construction employs a different substrate and coating process optimized for automated insertion equipment in commercial manufacturing environments.

The ±50ppm/°C temperature coefficient improves upon the RLR05 specification, reducing thermal drift to approximately 1.075% over temperature. The 0.25W power rating doubles the RLR05 capacity, though the reduced body length may concentrate heat generation, requiring thermal analysis when replacing lower-power-rated components in thermally constrained assemblies. The operating temperature range of -55°C to 155°C matches commercial standards while omitting the extended low-temperature qualification present in military specifications.

This alternative proves suitable for instrumentation, measurement equipment, and precision analog circuits where tolerance and temperature stability drive component selection more than environmental qualification. The absence of moisture resistance coating and weldable termination features limits applicability in harsh environments but reduces cost and expands supplier diversity for commercial procurement channels.

Comparison Summary: Key Differentiation Points

The RLR05C1004GRB14 RLR05C1004GRB14 Vishay Dale RES 1M OHM 2% 1/8W AXIAL 6252 maintains complete electrical and environmental equivalence to the original specification with only packaging or process code variations, making it the default substitution when availability permits. The CMF551M0BETR trades military qualification for improved tolerance and temperature coefficient while requiring larger PCB footprint and omitting moisture resistance. The MBB02070C1004FCT00 MBB02070C1004FCT00 Vishay Beyschlag/Draloric/BC Components RES 1M OHM 0.6W 1% AXIAL 17967 provides significantly higher power handling through metal oxide construction at the cost of increased physical size and absence of MIL-PRF documentation. The CCF071M00FKE36 offers compact dimensions with enhanced stability but eliminates environmental qualification features.

Power rating differences span from 0.125W (original) to 0.6W (MBB02070), directly impacting maximum allowable voltage and thermal dissipation capacity. Tolerance specifications range from ±0.1% (CMF55) to ±2% (RLR05), affecting initial accuracy requirements in precision circuits. Temperature coefficient variations between ±50ppm/°C and ±100ppm/°C determine resistance stability across operational temperature ranges. Physical dimensions vary from 0.138" to 0.350" in body length, influencing PCB layout compatibility and lead spacing requirements.

Qualification status represents the most significant application boundary—only the RLR05C1004GRB14 RLR05C1004GRB14 Vishay Dale RES 1M OHM 2% 1/8W AXIAL 6252 maintains MIL-PRF-39017/05 compliance necessary for defense and aerospace programs with contractual specification requirements. Commercial alternatives provide performance equivalence or enhancement for applications where qualification documentation represents procurement overhead rather than functional necessity.

Practical Validation Methods Using the RLR05C1004GRB14

When implementing the RLR05C1004GRB14 RLR05C1004GRB14 Vishay Dale RES 1M OHM 2% 1/8W AXIAL 6252 as a direct replacement, validation focuses on confirming physical interchangeability and procurement documentation alignment rather than electrical requalification. The shared base part number structure and identical dimensional specifications eliminate mechanical fit verification, but lead finish composition should be examined through supplier documentation to confirm solder alloy compatibility with existing assembly processes. Tin-lead versus pure tin plating affects wetting characteristics and intermetallic formation during reflow or wave soldering.

Thermal performance verification becomes relevant primarily in applications operating near the 0.125W maximum rating. Measuring actual resistor body temperature during operation using infrared thermography or thermocouple contact establishes whether the alternative component exhibits similar thermal coupling to the mounting substrate. Identical physical construction should produce equivalent thermal resistance, but manufacturing process variations in film deposition or substrate density may introduce minor differences. Temperature rise above ambient exceeding 40°C when dissipating 0.1W would indicate potential derating concerns requiring further investigation.

Documentation validation represents the most critical verification step for military-qualified components. The Certificate of Compliance (C of C) accompanying the RLR05C1004GRB14 RLR05C1004GRB14 Vishay Dale RES 1M OHM 2% 1/8W AXIAL 6252 should explicitly reference MIL-PRF-39017/05 qualification and include the same failure rate classification as the original component. Traceability to specific manufacturing lots and test data enables correlation with reliability prediction models and lifecycle management databases. Any discrepancy in qualification status or test methodology compared to the original specification requires formal deviation analysis before implementation in controlled applications.

Decision Framework for Optimal Replacement Selection

Applications requiring maintained MIL-PRF-39017/05 qualification or operating in defense/aerospace programs with contractual compliance obligations should select the RLR05C1004GRB14 RLR05C1004GRB14 Vishay Dale RES 1M OHM 2% 1/8W AXIAL 6252 as the only directly qualified alternative. The identical specification status eliminates requalification burden and maintains procurement traceability necessary for configuration management systems.

Commercial equipment designs prioritizing precision over environmental qualification benefit from the CMF55 or CCF07 series, which provide tighter tolerance and improved temperature coefficients in exchange for relaxed environmental ratings. The CMF55 suits applications with available PCB space and requirements for 0.1% initial accuracy, while the CCF07 addresses space-constrained designs needing ±50ppm/°C stability.

High-reliability commercial applications experiencing voltage transients, pulse loads, or elevated operating temperatures should evaluate the MBB02070C1004FCT00 MBB02070C1004FCT00 Vishay Beyschlag/Draloric/BC Components RES 1M OHM 0.6W 1% AXIAL 17967 for its 0.6W power rating and metal oxide construction. The increased thermal capacity accommodates higher ambient temperatures or power dissipation without derating, while the alternative film chemistry provides moisture resistance through material properties rather than external coating.

Designs originally specifying the RLR05 for moisture resistance features but operating in controlled environments may substitute any of the commercial alternatives after verifying that humidity exposure remains within commercial component ratings. Conversely, uncontrolled storage or operation in marine, outdoor, or industrial environments should retain military-qualified components or select alternatives explicitly rated for moisture resistance through construction methodology rather than environmental specification alone.