The Vishay Dale CMF55750R00JKR6 is a metal film through-hole resistor delivering 750 ohms resistance with ±5% tolerance and 0.5W power dissipation capability. This component belongs to the CMF series, an established product line recognized for combining reliable electrical performance with enhanced environmental protection features in axial-lead configurations.
Metal film construction provides this resistor with superior stability compared to carbon composition alternatives, achieving a temperature coefficient of ±100ppm/°C across an operating range from -55°C to 175°C. The precision-deposited resistive element maintains consistent resistance values under varying thermal conditions, which directly supports circuit stability in both analog signal conditioning and precision voltage division applications where resistance drift affects overall system accuracy.
The 750 ohm value positions this component effectively in sensor interface circuits, biasing networks, and current limiting functions where this specific impedance matches common design requirements. With 0.5W power handling, the resistor accommodates moderate current flows while maintaining thermal equilibrium in standard PCB mounting arrangements. The axial form factor measures 0.090" in diameter by 0.240" in length (2.29mm x 6.10mm), providing mechanical compatibility with automated insertion equipment and hand assembly processes while fitting within typical component spacing constraints.
Flame retardant coating and moisture resistant treatment enhance reliability in environments where humidity exposure or elevated temperature operation occurs. These protective layers reduce the risk of parametric drift and premature failure in industrial control equipment, automotive electronics, and outdoor instrumentation where environmental stress factors accelerate component aging. The safety designation indicates compliance with recognized construction standards that address electrical isolation and fire risk mitigation.
Two axial terminations facilitate straightforward PCB integration through conventional through-hole soldering processes. The component ships in tape and reel packaging, supporting volume manufacturing workflows with automated pick-and-place compatibility. Active product status ensures ongoing availability for both new designs and legacy system maintenance, while the 1199-piece inventory depth provides immediate fulfillment capability for prototype builds and small production runs.
The CMF55750R00JKR6 serves power supply filtering networks, op-amp feedback paths, LED current regulation, and general-purpose load applications requiring the 750 ohm resistance value with standard tolerance margins. Its metal film technology and protective features deliver consistent performance across the specified temperature range without requiring additional external protection in most circuit implementations.
When a specific axial metal film resistor becomes unavailable due to supply constraints, end-of-life announcements, or cost considerations, design and procurement teams must identify functionally equivalent components that maintain circuit performance without requiring PCB redesign. The Vishay Dale CMF55750R00JKR6—a 750Ω, 0.5W metal film resistor with ±5% tolerance and axial through-hole configuration—appears in power supply feedback networks, signal conditioning circuits, and current sensing applications where thermal stability and moisture resistance are specified. Direct replacements from Vishay BC Components MRS25000C7500FRP00, Yageo MFR-50FRF52-750R, KOA Speer MF1/2CCT52R751J, and TE Connectivity H8750RB represent the primary alternatives discussed in this analysis. Each offers similar electrical characteristics within the same axial form factor but differs in coating materials, lead-free compliance status, and procurement availability.
CMF55750R00JKR6 (1)
Original Component Technical Foundation
The CMF55750R00JKR6 belongs to Vishay's CMF55 series, designed for industrial and telecommunications equipment requiring stable resistance over temperature and environmental stress. Metal film construction provides ±100ppm/°C temperature coefficient, maintaining resistance drift below 0.5% across its -55°C to +175°C operating range. The 0.5W power rating at 70°C ambient, combined with flame retardant and moisture-resistant coating, addresses applications subject to MIL-STD-202 method 106 humidity testing or UL94V-0 flammability requirements.
Physical dimensions measure 2.29mm diameter by 6.10mm body length with axial leads extending from both ends, compatible with 0.4-inch lead spacing on standard through-hole layouts. This footprint directly interchanges with most military and commercial axial resistor standards, simplifying replacement integration. The ±5% tolerance suffices for bias networks, pull-up/pull-down functions, and RC timing circuits where precision below 1% is unnecessary.
Current RoHS non-compliance reflects legacy manufacturing processes using lead-based solder terminations. Designs requiring RoHS conformance must transition to alternative components during obsolescence planning or regulatory-driven redesigns.
Vishay BC Components MRS25000C7500FRP00 Direct Cross-Reference
Vishay BC Components MRS25000C7500FRP00 shares identical 750Ω resistance, 0.5W power rating, and ±5% tolerance specifications within the same axial package dimensions. Manufactured under the MRS25 series, this component uses metal film deposition on ceramic substrates with similar ±100ppm/°C temperature coefficient, ensuring predictable resistance behavior across the -55°C to +155°C operating range.
The primary differentiation lies in coating formulation—MRS25000C7500FRP00 employs epoxy-based conformal coating meeting IEC 60115-1 moisture resistance standards but lacks explicit flame retardant certification equivalent to UL94V-0. Applications in consumer electronics or commercial equipment without mandatory flammability compliance can substitute without functional impact. Power derating curves align within 5% between both series, maintaining equivalent thermal performance when mounted with identical lead lengths and airflow conditions.
Lead finish typically conforms to RoHS-compliant tin plating rather than tin-lead solder, requiring validation during wave soldering or hand assembly processes. Solderability testing per IEC 60068-2-20 confirms compatibility with lead-free reflow profiles up to 260°C peak temperature.
Yageo MFR-50FRF52-750R High-Volume Manufacturing Alternative
Yageo MFR-50FRF52-750R targets cost-sensitive applications requiring broad second-source availability and established automotive qualification. Rated at 0.5W with ±1% tolerance improvement over the original CMF55750R00JKR6, this component provides tighter resistance matching for differential pair networks or voltage divider applications where 5% variation exceeds allowable error budgets.
Temperature coefficient specification holds at ±100ppm/°C, matching Vishay performance across -55°C to +155°C ambient conditions. Axial body dimensions measure 2.3mm diameter by 6.5mm length—a 0.4mm length increase requiring verification against minimum component spacing rules in dense PCB layouts. Lead diameter remains consistent at 0.6mm, maintaining compatibility with existing wave solder stencils and automated insertion tooling.
Yageo's MFR series incorporates flame retardant epoxy coating certified to UL94V-0, directly replacing CMF55 safety characteristics in power supply designs subject to UL60950 or IEC 62368 compliance testing. Moisture resistance meets MIL-STD-202 Method 103B requirements, supporting outdoor equipment or high-humidity industrial environments without additional conformal coating.
The ±1% tolerance trades component cost increase for reduced calibration requirements in production test, potentially offsetting higher unit price through faster throughput in high-mix manufacturing.
KOA Speer MF1/2CCT52R751J Industrial-Grade Option
KOA Speer MF1/2CCT52R751J delivers 750Ω resistance at 0.5W power rating with ±5% tolerance, positioned for industrial control systems and instrumentation requiring extended temperature operation. The MF1/2 series specifies -55°C to +155°C ambient range with ±50ppm/°C temperature coefficient—a 50% improvement over CMF55 specifications that reduces resistance drift to 0.375% maximum across full temperature excursion.
Enhanced thermal stability benefits precision analog circuits where temperature-induced resistance variation introduces measurement error or reference voltage drift. Applications including 4-20mA current loop biasing, thermocouple cold junction compensation, and strain gauge excitation circuits gain accuracy improvement without requiring more expensive thin-film or precision wirewound alternatives.
Axial dimensions measure 2.5mm diameter by 7.0mm length, representing the largest physical profile among alternatives discussed. Board layouts with tight component pitch below 10mm center-to-center spacing should verify clearance to adjacent components, particularly electrolytic capacitors or power semiconductors generating localized heating. Increased thermal mass from larger body size provides improved pulse handling capability, absorbing transient power spikes up to 10x rated power for sub-millisecond durations without catastrophic failure.
Coating material conforms to flame retardant standards and moisture resistance per MIL-PRF-55182, qualifying for military and aerospace applications requiring formal qualification testing documentation.
TE Connectivity H8750RB General Purpose Replacement
TE Connectivity H8750RB offers 750Ω, 0.5W, ±5% specification in standard axial configuration targeting commercial electronics and general-purpose applications. The H8 series prioritizes procurement availability and cost optimization over extended environmental specifications, limiting operating temperature to -55°C to +130°C—a 45°C reduction compared to CMF55750R00JKR6.
This temperature constraint excludes H8750RB from applications experiencing sustained ambient conditions above 110°C, including motor control boards, power converter output stages, and automotive under-hood electronics. Consumer products, office equipment, and HVAC controls operating within room-temperature environments can substitute without performance degradation.
Temperature coefficient specification reaches ±200ppm/°C, doubling the drift rate of the original component. Resistance variation across 100°C temperature swing approaches 2% maximum deviation, requiring circuit margin analysis for voltage dividers or timing networks where cumulative error impacts system accuracy. Fixed-bias stages and pull-up networks tolerate this variation without functional impact.
Physical dimensions match 2.3mm diameter by 6.0mm length, closely aligning with CMF55 footprint and maintaining direct mechanical interchange. Moisture resistance meets commercial-grade testing per IEC 60068-2-78 without military qualification, suitable for indoor equipment but requiring additional protective measures in outdoor or marine environments.
Comparative Analysis of Replacement Options
Electrical performance across all alternatives maintains 750Ω nominal resistance and 0.5W power rating, ensuring functional compatibility within the same application voltage and current boundaries. Tolerance variation spans ±1% for Yageo MFR-50FRF52-750R to ±5% for remaining options, with tighter tolerance improving precision without affecting basic circuit function.
Temperature coefficient differences separate alternatives into three performance tiers: KOA Speer MF1/2CCT52R751J at ±50ppm/°C provides highest stability; CMF55750R00JKR6, MRS25000C7500FRP00, and MFR-50FRF52-750R maintain ±100ppm/°C mid-range performance; H8750RB at ±200ppm/°C serves cost-sensitive applications with relaxed drift requirements.
Operating temperature ranges impact application suitability significantly. CMF55750R00JKR6 leads with -55°C to +175°C capability, followed by Vishay MRS25, Yageo MFR, and KOA MF1/2 series at -55°C to +155°C. TE Connectivity H8750RB restricts usage to -55°C to +130°C, limiting deployment in elevated-temperature environments.
Physical dimensions remain within 0.5mm variance across diameter and 1mm variance in body length. Yageo and KOA alternatives extend length slightly beyond original specifications, requiring board layout verification in space-constrained designs. All maintain 0.6mm lead diameter and 0.4-inch lead spacing compatibility.
Environmental compliance separates RoHS-compliant alternatives (Vishay MRS25, Yageo MFR, KOA MF1/2) from legacy CMF55750R00JKR6 construction. Flame retardant and moisture resistance certifications remain consistent across Vishay, Yageo, and KOA products, while TE Connectivity H8750RB provides commercial-grade environmental protection without military specification compliance.
Practical Validation Using Yageo MFR-50FRF52-750R
Verifying Yageo MFR-50FRF52-750R as a replacement for CMF55750R00JKR6 begins with resistance measurement at room temperature using a four-wire ohmmeter to eliminate lead resistance effects. Measured values should fall within 742.5Ω to 757.5Ω range, confirming ±1% tolerance specification. Comparing against original component readings establishes baseline deviation, typically under 0.3% for properly matched batches.
Thermal performance validation requires mounting the component on test PCB with identical lead length and pad geometry as production design. Applying 0.4W load—80% of rated power—while monitoring case temperature with thermocouple attachment verifies thermal resistance consistency. Case temperature rise should stabilize within 5°C of CMF55750R00JKR6 baseline under identical ambient and airflow conditions. Significant deviation indicates insufficient board copper area or altered heat dissipation path requiring layout modification.
Temperature coefficient testing involves resistance measurement at 25°C, -40°C, and +125°C using environmental chamber with four-wire measurement capability. Resistance variation across 100°C span should remain below 1% for both components, confirming equivalent thermal stability. Applications requiring precise matching measure multiple samples from each lot, selecting units within 0.5% resistance spread to minimize temperature-induced circuit drift.
Moisture resistance undergoes accelerated testing per IEC 60068-2-78 at 85°C/85% RH for 168 hours. Post-test resistance shift below 1% and absence of coating degradation or lead corrosion validates environmental equivalence. Power supply applications benefit from additional surge testing at 2x rated power for 1 second duration, repeated 100 times to verify pulse handling capacity matches original component performance.
Solderability assessment involves hand soldering test samples using both tin-lead and lead-free solder profiles, measuring wetting time and joint appearance per IEC 60068-2-20 criteria. RoHS-compliant tin finish on MFR-50FRF52-750R requires slightly longer dwell time during wave soldering compared to tin-lead terminations, typically increasing process time by 0.5 seconds without affecting joint reliability.
Conclusion
Selecting an appropriate replacement for Vishay Dale CMF55750R00JKR6 depends on application thermal requirements, environmental exposure, and regulatory compliance mandates. Vishay BC Components MRS25000C7500FRP00 provides closest direct substitution with identical manufacturer lineage and minimal specification deviation, recommended when maintaining single-vendor sourcing simplifies supply chain management.
Yageo MFR-50FRF52-750R delivers best balance of performance, cost, and availability for moderate-volume production requiring RoHS compliance and UL94V-0 flame rating. The improved ±1% tolerance suits precision analog circuits while broad distributor inventory supports responsive procurement.
KOA Speer MF1/2CCT52R751J addresses high-reliability applications where ±50ppm/°C temperature coefficient and military qualification documentation justify premium pricing. Industrial instrumentation and aerospace systems benefit from enhanced thermal stability and formal test reporting.
TE Connectivity H8750RB serves cost-constrained commercial products operating within -55°C to +130°C range where extended temperature capability and military specifications exceed functional requirements. Consumer electronics and office equipment represent primary target applications.
