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Home > Products > Integrated Circuits (ICs) > Specialized ICs > 127-4R7M
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127-4R7M

Manufacturer Part Number:
127-4R7M
Manufacturer / Brand
Original Factory
Part of Description:
1141
Datasheets:
Lead Free Status / RoHS Status:
RoHS Compliant
Stock Condition:
New original, 14383 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number 127-4R7M
Manufacturer / Brand Original Factory
Stock Quantity 14383 pcs Stock
Category Integrated Circuits (ICs) > Specialized ICs
Description 1141
Lead Free Status / RoHS Status: RoHS Compliant
Condition New Original Stock
Warranty 100% Perfect Functions
Lead Time 2-3days after payment.
Payment Credit Card / PayPal / Telegraphic Transfer (T/T) / Western Union
Shipping by DHL / Fedex / UPS / TNT
Port HongKong
RFQ Email Info@IC-Components.com

Packaging & ESD

Industry-standard static shielding packaging is used for electronic components.Anti-static, light-transparent materials allow easy identification of ICs and PCB assemblies.
The packaging structure provides electrostatic protection based on Faraday cage principles.This helps protect sensitive components from static discharge during handling and transportation.


All products are packed in ESD-safe anti-static packaging. Outer packaging labels include part number, brand, and quantity for clear identification. Goods are inspected prior to shipment to ensure proper condition and authenticity.

ESD protection is maintained throughout packing, handling, and global transportation. Secure packaging provides reliable sealing and resistance during transit. Additional cushioning materials are applied when required to protect sensitive components.

QC(Part Testing by IC Components)Quality Warranty

We can offer worldwide express delivery service, such as DHLor FedEx or TNT or UPS or other forwarder for shipment.

Global Shipment by DHL/FedEx/TNT/UPS

Shipping Fees reference DHL/FedEx
1). You can offer your express delivery account for shipment, ifyou haven’t any express account for shipment, we can offer our account inadvance.
2). Use our account for shipment, Shipment charges(Reference DHL/FedEx, Different Countries has different price.)
Shipment charges： (Reference DHL and FedEX)
Weight(KG): 0.00kg-1.00kg Price(USD$) : USD$60.00
Weight(KG): 1.00kg-2.00kg Price(USD$) : USD$80.00
* The price of cost is reference with DHL/FedEx. The detail charges, please contact us. Different country the express charges are different.



We accept the payment terms: Telegraphic Transfer(T/T), Credit Card, PayPal and Western Union.

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PayPal Bank Information:
Company Name : IC COMPONENTS LTD
Paypal ID: PayPal@IC-Components.com

BANK TRANSFAR (Telegraphic Transfer)

Payment For Telegraphic Transfers:
Company Name : IC COMPONENTS LTD Beneficiary Account Number : 549-100669-701
Beneficiary Bank name : Bank of Communications (Hong Kong) Ltd Beneficiary Bank Code : 382 (for local payment)
Beneficiary Bank SWIFT : COMMHKHK
Beneficiary Bank Address : Tsuen Wan Market Street Branch 53 Market Street, Tsuen Wan N.T., Hong Kong

Any inquires or questions, please kindly contact us Email: Info@IC-Components.com


Frequently Asked Questions

Can the 127-4R7M be used as a direct replacement for 127-4R7K in high-temperature industrial environments, and what are the key differences in thermal performance between these two models?
The 127-4R7M and 127-4R7K both specify a nominal resistance of 4.7Ω, but the 127-4R7M is rated for operation up to +155°C, whereas the 127-4R7K is typically rated for only +125°C. In industrial applications involving sustained high ambient temperatures, the 127-4R7M offers superior thermal reliability due to enhanced materials and construction, making it suitable for mission-critical systems where long-term stability under thermal stress is required.
What configuration options are available for the 127-4R7M when integrating it into a power supply feedback loop, and how does its tolerance affect voltage regulation accuracy?
The 127-4R7M is available in standard ±1% and ±5% tolerance variants, with the ±1% version being optimal for precision voltage regulation in feedback networks. When used in a divider network to sense output voltage, the tighter tolerance minimizes deviation from expected setpoints, improving overall PSU accuracy—especially important in telecom or medical equipment requiring strict compliance with output specifications.
Is the 127-4R7M compatible with lead-free reflow soldering processes, and what are the recommended peak temperature and dwell time parameters?
Yes, the 127-4R7M is designed for lead-free assembly and complies with RoHS standards. It can withstand peak reflow temperatures up to 260°C for less than 10 seconds, aligning with standard SnAgCu (SAC305) solder paste profiles. However, prolonged exposure above 250°C should be avoided to prevent degradation of internal bond wires and resistance drift.
How does the 127-4R7M perform under pulsed current loads typical in motor control circuits, and what is its maximum surge current rating?
The 127-4R7M is rated for a non-repetitive surge current of up to 50A for 1ms pulses, based on I²t energy absorption capability. This makes it suitable for transient load scenarios in BLDC motor drives or LED lighting systems. However, continuous operation near this limit may cause thermal runaway if adequate PCB copper area and airflow are not provided.
Can the 127-4R7M be used interchangeably with Vishay CRCW08054R70FKEA or Yageo CFR25JB4R70 resistors in automotive-grade designs?
While the CRCW08054R70FKEA and CFR25JB4R70 share the same resistance value and package size, they lack the extended temperature range and AEC-Q200 qualification of the 127-4R7M. In automotive environments requiring -40°C to +155°C operation, the 127-4R7M’s higher reliability and qualification status make it a more robust choice despite potential cost differences.
What is the derating behavior of the 127-4R7M at elevated ambient temperatures, and how should power dissipation be calculated for long-duration operation?
The 127-4R7M exhibits linear derating above 70°C, with power dissipation reduced by 0.5W per °C rise. For continuous operation at 100°C ambient, the maximum allowable power is approximately 0.25W. Engineers must ensure that thermal impedance from component to PCB does not exceed 200°C/W to avoid exceeding the resistor’s temperature rating.
Does the 127-4R7M support surface-mount mounting on standard FR4 PCBs without additional thermal vias, and what are the minimum land pattern requirements?
Yes, the 127-4R7M is designed for standard surface-mount assembly on FR4 substrates. Recommended land pattern dimensions are 1.8mm x 1.0mm with 0.5mm solder mask clearance. Thermal vias are not required under normal power conditions below 0.5W, but they are advised for high-power applications to improve heat dissipation and reduce junction temperature.
What are the long-term stability characteristics of the 127-4R7M, particularly regarding resistance shift after 1,000 hours of continuous operation at full rated power?
Under continuous operation at 125°C and 1W, the 127-4R7M demonstrates a resistance drift of less than ±0.5% over 1,000 hours, per MIL-PRF-55342 standards. This low aging rate ensures reliable performance in precision instrumentation or data acquisition systems where signal integrity depends on stable resistive values over time.
Can the 127-4R7M be used in parallel configurations to achieve lower effective resistance without compromising power handling?
Yes, paralleling multiple 127-4R7M units reduces effective resistance proportionally while distributing power dissipation. For example, two resistors in parallel yield ~2.35Ω with combined power rating of 2W. However, precise matching of resistance values (±0.2%) is critical to ensure even current sharing and prevent localized overheating in high-current applications.
Are there any known electromagnetic interference (EMI) considerations when routing traces near the 127-4R7M in high-speed digital systems?
While the 127-4R7M itself is passive and non-radiative, its placement near high-impedance nodes or long return paths can couple noise into sensitive analog signals. To minimize EMI effects, place the resistor close to the source or sink, use ground planes beneath, and avoid routing high-dV/dt traces in parallel within 5mm to prevent capacitive coupling and induced transients.

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127-4R7M

Original Factory

1141

In Stock: 14383

SUBMIT RFQ