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Engineer the Power Behind Modern Transportation

Measure high current, manage high voltage and withstand transient energy with resistor and variable-component technologies engineered for electrified, connected and increasingly automated transportation systems.

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The High Cost of Under-Specified Components

Passive components chosen on nominal specs alone carry risk that surfaces later — in prototyping, qualification, or the field. Here's where under-specification costs transportation engineers the most.


Unverified Electrical & Thermal Performance

Unverified Electrical & Thermal Performance

A component chosen on nominal resistance and power rating alone can fail once it meets the platform's actual voltage, current, transient and thermal conditions — driving late-stage redesign.

Measurement Error When It Matters Most

Measurement Error When It Matters Most

Resistance drift with temperature (TCR) erodes current and voltage measurement accuracy just as protection, control and diagnostics depend on it.

Competing Requirements, Late Discovery

Competing Requirements, Late Discovery

Lower resistance cuts power loss but shrinks the measurement signal; higher power density cuts thermal margin. These trade-offs surface only after prototyping if they aren't modeled up front.

Power, Measurement & Control Across Every Electrified Platform

EV & Hybrid Powertrains

Measure and control increasingly high currents in traction inverters, DC-DC conversion, on-board charging and auxiliary power systems — while minimizing power loss and heat.

Battery & Energy Management

Support accurate current and high-voltage measurement, pre-charge/discharge circuits, contactor monitoring and thermal-management controls across normal operation, charging and fault conditions.

Charging & High-Voltage Power Electronics

Enable voltage division, bleeder and pre-charge circuits, inrush management and power monitoring within higher-voltage on-board and DC fast-charging architectures.

Electric Steering, Braking & Actuation

Provide current-sense and precision feedback components for pumps, actuators, motor drives, electric power steering and brake-by-wire systems replacing traditional mechanical and hydraulic functions.

Commercial, Off-Highway & Specialty Vehicles

Withstand elevated temperature, repetitive electrical loading and vibration across electrified drivetrains, hydraulic pump control, auxiliary motor drives and power distribution.

Rail & Mass Transit

Support high-power traction, auxiliary conversion, braking energy dissipation, current monitoring and control electronics across long operating lifecycles.

Featured Solutions for Transportation

LRMAP3920 / LRMAP4026 — High-Current Measurement

LRMAP3920 / LRMAP4026 — High-Current Measurement

Metal-alloy current-sense resistors for high-current power electronics. 0.2 mΩ–3 mΩ, up to 5 W, LRMAP4026 rated to 170°C max ambient.

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ULR Series — Automotive-Qualified Low-Resistance Current Sensing

ULR Series — Automotive-Qualified Low-Resistance Current Sensing

From 0.5 mΩ, up to 2 W, TCR down to 50 ppm/°C, operation to 170°C, AEC-Q200 qualified.

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OARS Series — Current Sensing for High-Thermal Environments

OARS Series — Current Sensing for High-Thermal Environments

Open-air metal-element construction from IRC. OARS1: 2 mΩ, 2 W, TCR to 20 ppm/°C, 160°C max ambient, AEC-Q200 qualified.

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High-Voltage Resistor Technologies — HV Measurement & Control

High-Voltage Resistor Technologies — HV Measurement & Control

Support measurement and control as transportation architectures move to higher operating voltages.

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Pulse & Surge Resistor Technologies — Transient Energy Management

Pulse & Surge Resistor Technologies — Transient Energy Management

Wirewound and specialized pulse-resistant technologies for inrush, repetitive pulses and fault-energy conditions.

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BI Technologies Potentiometers — Position Feedback & Control

BI Technologies Potentiometers — Position Feedback & Control

Precision potentiometer technologies for analogue position and control functions requiring repeatable mechanical feedback.

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Your Trusted Passive Components Partner

Your Trusted Passive Components Partner

TT Electronics' Welwyn, IRC and BI Technologies brands bring decades of experience in resistor and variable-component technologies to the electrical, thermal and mechanical demands of transportation platforms.

  • Decades of Resistor & Variable-Component Expertise: Welwyn, IRC and BI Technologies combine current-sense, precision, high-voltage, pulse/surge and potentiometer technologies under one portfolio.
  • AEC-Q200 Qualified Portfolio: Selected current-sense and resistor families are qualified for elevated-temperature, high-current automotive and transportation environments.
  • Technology Breadth, Not One-Size-Fits-All:Metal-alloy SMD, open-air metal-element, thick-film, wirewound and potentiometer technologies, selected by the dominant engineering problem rather than treated as interchangeable.

Your Path from Specification to Deployment

We help you balance commercial off-the-shelf (COTS) speed with application-specific customisations to achieve optimal performance.

Define the Electrical & Operating Profile

Define the Electrical & Operating Profile

Determine nominal/maximum current and voltage, normal and fault power, pulse shape and duration, required measurement accuracy, TCR, thermal path, package/PCB area, and environmental, mechanical and qualification requirements.

Select the Technology from the Data

Select the Technology from the Data

Match the dominant engineering problem to the right technology — e.g., sub-milliohm metal-element for high current and efficiency, low-TCR current-sense with Kelvin layout for measurement accuracy, high-voltage resistor technology for compact high-voltage PCBs, or pulse/surge and wirewound technology for inrush and transient energy.

Validate for the Transportation Environment

Validate for the Transportation Environment

Use product data, application guidance, models, samples and engineering support to evaluate performance under the real operating profile, then specify with the required qualification, compliance, documentation and lifecycle support for production.

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Passive Components Engineered for Electrified Transportation

Passive Components Engineered for Electrified Transportation

As transportation becomes more electrified, passive components increasingly sit at the intersection of power, measurement, protection and control. TT Electronics' Welwyn, IRC and BI Technologies resistor and variable-component technologies help engineers measure more current with less loss, manage higher voltage, design for the transient, control heat, maintain measurement accuracy, and electrify motion and control — backed by the technical data and engineering expertise needed to move from specification through validation to production.

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