Infineon Technologies BCR402UE6327HTSA1

Overview

BCR402UE6327HTSA1 from Infineon Technologies is a linear constant-current LED driver IC in SC74 package, preset to 20 mA output with external resistor adjustment up to 65 mA, featuring 1.4 V minimum voltage overhead, -0.2 %/K negative thermal coefficient, and AEC-Q101 qualification for automotive lighting. It operates from 4.5 V to 40 V supply and delivers stable current across varying LED forward voltages and supply fluctuations.

For engineers reviewing the BCR402UE6327HTSA1 datasheet, BCR402UE6327HTSA1 pinout, BCR402UE6327HTSA1 application, or BCR402UE6327HTSA1 equivalent, key selection criteria include its low dropout (1.4 V), thermal derating behavior, SC74 footprint compatibility, and suitability for CHMSL, rear combination lamps, and low-power decorative LED strips where precision current control replaces resistive biasing.

Technical Context

This device functions as a three-terminal adjustable current source with internal reference and pass transistor. Its output current is set by an external resistor connected between Rext (Pin 6) and GND (Pin 1), while OUT pins (2, 3, 5) are internally paralleled to share load current and improve thermal distribution. The -0.2 %/K temperature coefficient ensures automatic current reduction above 25 °C, extending LED lifetime under thermal stress.

The SC74 package enables compact placement on PCBs with minimal thermal resistance (R_thJS = 180 K/W), supporting up to 750 mW total power dissipation at board-level mounting. Operation requires no external compensation, and dimming is implemented via PWM-controlled transistor at the ground path-leveraging the device's ground-referenced current sense architecture.

Key Specifications

Pinout & Package

BCR402UE6327HTSA1 uses the SC74 (SOT-26) thermally enhanced 6-pin package with exposed thermal pad (pin 4 is VS, not thermal pad). Pin 1 is GND; pins 2, 3, and 5 are paralleled OUT terminals sharing current path; pin 4 is VS (supply input); pin 6 is Rext (external current-setting resistor node).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSI45020AT1G and TLC59108IPWR, BCR402UE6327HTSA1 uniquely balances analog simplicity, automotive voltage range, thermal self-protection, and scalable current via Rext-making it optimal for cost-sensitive, thermally demanding, single-string LED loads where programmability is unnecessary.

Availability

BCR402UE6327HTSA1 is available at Aetrix Electronics and suitable for automotive CHMSL, rear combination lamps, and refrigerator interior lighting requiring stable component supply, AEC-Q101 compliance, and thermal resilience in compact form factors.

Supply support for BCR402UE6327HTSA1 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 sensor systems, with global R&D and manufacturing infrastructure.

BCR402UE6327HTSA1 belongs to Infineon's BCR family of linear LED drivers designed specifically for cost-sensitive, thermally robust, and AEC-Q101-compliant automotive and industrial lighting applications where precision analog current control replaces discrete solutions.

FAQ

Can BCR402UE6327HTSA1 drive multiple LEDs in series?

Yes - it regulates current through a single string of series-connected LEDs, provided the total forward voltage remains below (V_S – 1.4 V). For example, at V_S = 12 V, up to three white LEDs (3.2 V each) can be driven with 2.4 V headroom. The device does not support parallel LED strings without individual current-setting resistors or additional drivers.

What is the maximum allowable Rext value for 10 mA output?

Based on the internal reference voltage of 1.25 V, R_EXT = 1.25 V / 10 mA = 125 Ω. However, the datasheet specifies minimum R_EXT = 19 Ω (for 65 mA), and values above 1 kΩ are not characterized. For 10 mA, use R_EXT = 120 Ω ±1% metal film resistor with 0.5 W rating to ensure stability and thermal margin.

Does BCR402UE6327HTSA1 require input capacitance?

Yes - a minimum 1 µF X5R ceramic capacitor rated ≥50 V must be placed between VS (Pin 4) and GND (Pin 1), within 5 mm of the package. This suppresses supply transients and prevents oscillation during load switching, especially in automotive environments with load-dump events.

How is thermal performance affected when only two OUT pins are used?

Using fewer than all three OUT pins (2/3/5) increases current density per pin and raises local junction temperature. Derating curves in Figure 3-9 show up to 15% current reduction at 100 °C ambient if only one OUT is connected. Full thermal rating (750 mW) assumes all three OUT pins are soldered and thermally coupled to PCB copper.