Metal Alloy Current sense resistor

Design Advantages

The Metal Alloy Current Sense Resistor from RST Electric provides a highly stable, low-inductance solution for measuring DC and AC currents in modern power electronics. Designed specifically for applications where board space is limited and accuracy is paramount, this Low Ohm Resistor utilizes a precision metal alloy element (manganin or similar) that offers an excellent combination of low temperature coefficient, high surge capability, and long-term stability. The vertical, radial-lead package allows the resistor to stand upright, minimizing its footprint while promoting natural air circulation around the element—a critical advantage in dense layouts where heat dissipation is a concern.

Structural Optimization

The construction of this Metal Element Resistor is optimized for both electrical performance and mechanical reliability. The resistive element is manufactured from a high-stability alloy with a temperature coefficient as low as ±50 ppm/°C, ensuring that the resistance value remains virtually constant across the operating temperature range. The element is then welded to tinned copper leads and encapsulated in a flame-retardant housing that provides mechanical protection while allowing the open-air design to maximize cooling. The resulting component offers ultra-low inductance, making it suitable for high-frequency switching circuits where conventional wirewound resistors would introduce unwanted phase shift or voltage spikes.

Resistance & Current Rating Specifications

The FLQ53 series spans a resistance range of 2mΩ to 50mΩ, with current ratings from 2.5A up to 21A, corresponding to typical voltage drops of 50mV to 100mV at full scale—ideal for direct interface with analog-to-digital converters and operational amplifiers. Standard tolerances of ±1%, ±2%, and ±5% accommodate both precision instrumentation and general-purpose applications.

As a trusted Metal Alloy Current sense resistor manufacturer in China, RST Electric combines over 10 years of precision resistor engineering with rigorous quality control to deliver components that provide accurate, drift-free current feedback in the most demanding environments.

Technical Specification

Product Features

1.Ultra-Low Resistance Values – From 2mΩ to 50mΩ, enabling accurate measurement of currents from a few amperes to over 20A with minimal power loss and low voltage drop .

2.Low Temperature Coefficient (TCR) – ±50 ppm/°C to ±100 ppm/°C ensures stable resistance values across temperature variations, critical for precision current sensing .

3.Extremely Low Inductance – Metal alloy construction virtually eliminates parasitic inductance, making it ideal for high-frequency switching circuits and fast transient response .

4.Wide Current Range – Covers 2.5A to 21A in a single series, providing design flexibility across multiple power levels .

5.Compact Vertical Footprint – Radial-lead upright design minimizes PCB area consumption, allowing dense component placement .

6.High Stability & Reliability – Precision metal alloy element offers excellent long-term stability and resistance to thermal cycling .

7.Flame-Retardant Coating – Encapsulated in a durable, flame-retardant material that meets safety requirements for industrial and consumer electronics .

8.Precision Tolerances – Available in ±1%, ±2%, ±5%, and ±10% to accommodate both high-accuracy and cost-sensitive designs .

9.Customizable Parameters – Special resistance values, lead forming, and matched pairs available for application-specific requirements .

10.Easy PCB Integration – Standard radial lead pitch (5mm to 50mm depending on current rating) compatible with automated insertion equipment .

Product Applications

Drawing and dimensions

Package and shipment

RST Electric ensures safe delivery of every Metal Alloy Current Sense Resistor:

● Bulk Packaging: Resistors are packed in anti-static bags with foam padding, then placed in corrugated cartons to prevent lead bending and element deformation.

● Lead Protection: Leads are kept straight with foam end caps or plastic lead-forming spacers.

● Documentation: Packing lists and inspection certificates included with each shipment.

● Freight Options: Express courier (DHL/FedEx/UPS) for small quantities, air freight for medium volumes, sea freight for bulk orders.

FAQ

Q: Why did you choose RST Electric?

A: We have been deeply involved in the field of metal alloy current detection resistors for over 10 years. We have an ISO 9001-certified production base. We independently control every step from alloy selection, forming to detection throughout the process, without any intermediate steps. This ensures higher cost-effectiveness. Moreover, Metal Alloy Current Sense Resistor has high precision and good heat dissipation, and is suitable for various power electronic scenarios.

Q: What customization services are supported?

A: Full-dimensional customization is supported, including current rating (2.5A - 21A), resistance value (2mΩ - 50mΩ), tolerance (as low as ±0.5%), lead forming (including custom support height), lead coating (tin-lead, pure tin, gold plating), as well as personalized adjustments for parameters such as temperature coefficient, TCR, etc.

Q: What are the quality guarantees?

A: Each Metal Alloy Current sense resistor undergoes 100% electrical testing (resistance value, tolerance, TCR), and internal reliability tests are conducted to verify stability under temperature cycling and current cycling. We strictly follow the ISO 9001 standard to ensure that every product meets the industrial-grade quality requirements.

Q: What are the delivery and after-sales guarantees?

A: For standard specification products, the delivery period is 7-10 days; for customized products, it is 10-15 days. Complete test reports, material certificates, etc. will be provided with the goods. We offer a 12-month warranty. Remote fault diagnosis, spare parts supply, and technical support will be provided. Assistance in completing product integration and debugging can also be offered.