Infineon Technologies BCR402WH6327XTSA1

Overview

BCR402WH6327XTSA1 from Infineon Technologies is a linear constant-current LED driver IC in SOT343-3D package, preset to 20 mA output with external resistor adjustment up to 60 mA, 1.2 V dropout voltage, −0.3 %/K thermal coefficient, and AEC-Q101 qualification for automotive rear lighting and CHMSL applications.

For engineers reviewing the BCR402WH6327XTSA1 datasheet, BCR402WH6327XTSA1 pinout, BCR402WH6327XTSA1 application, or BCR402WH6327XTSA1 equivalent, key selection criteria include guaranteed current accuracy over supply voltage variation (±5 % at VS = 5–18 V), thermal derating behavior, low-voltage overhead for high-efficiency low-power LED strings, and RoHS-compliant SOT343 footprint compatibility.

Technical Context

The BCR402W operates as a two-terminal adjustable current sink with internal reference and pass transistor, regulating LED current via external R_ext connected between IOUT and GND. Its negative temperature coefficient actively reduces output current above 25 °C to extend LED lifetime under thermal stress.

It requires no external capacitor or feedback loop, supports direct parallel operation for higher current, and accepts input voltages up to 18 V while maintaining stable current despite ±10 % supply variation and ±0.2 V forward voltage mismatch across LED strings.

Key Specifications

Pinout & Package

SOT343-3D (4-pin, 1.6 × 1.6 × 0.55 mm) surface-mount package with exposed thermal pad; JEDEC standard footprint, RoHS-compliant, Pb-free plating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant-current LED driver applications.

Compared with AL8805W50-7 and NSI45020AT1G, the BCR402WH6327XTSA1 uniquely balances adjustability, thermal protection, and minimal BOM count in space-constrained automotive and medical LED systems-without inductors or complex compensation.

Availability

BCR402WH6327XTSA1 is available at Aetrix Electronics and suitable for automotive CHMSL, aircraft interior lighting, and medical examination lamp designs requiring stable component supply, long-lifecycle support, and AEC-Q101 compliance.

Supply support for BCR402WH6327XTSA1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949.

The BCR402W belongs to Infineon's LED Linear Driver product line, engineered specifically for cost-sensitive, thermally constrained, low-power LED lighting in automotive and industrial environments where simplicity and reliability outweigh switching complexity.

FAQ

Can BCR402WH6327XTSA1 drive three white LEDs in series?

No. With typical VF ≈ 3.2 V per white LED, three in series require ≥9.6 V forward voltage. At VS = 12 V, the 1.2 V dropout leaves only 0.8 V margin-insufficient for stable regulation. It is validated for ≤2 white LEDs (max 7.6 V total VF) or ≤3 red/amber LEDs (VF ≤ 2.2 V each).

What is the minimum R_ext value for 60 mA output?

Per datasheet Equation 1, R_ext = 10 kΩ / ((I_OUT/20 mA) − 1). For 60 mA, R_ext = 10 kΩ / (3 − 1) = 5.0 kΩ. Standard 5.1 kΩ ±1 % resistor achieves 59.4 mA with <±0.5 % error at 25 °C.

Does it require an input capacitor?

No. The BCR402W is internally compensated and stable without input or output capacitors. Adding bulk capacitance at VS is optional for transient suppression in automotive environments but not required for regulation stability.

How does the −0.3 %/K coefficient affect brightness at 85 °C ambient?

At 85 °C junction temperature (ΔT = 60 K above 25 °C), output current reduces by 18 % (60 × 0.3 %), yielding ~16.4 mA from a 20 mA preset. This intentional derating lowers LED junction temperature, extending lumen maintenance to >90 % at 10,000 hours.