Infineon Technologies BCR410WE6327HTSA1

Overview

BCR410WE6327HTSA1 from Infineon Technologies is a bias controller IC designed to supply stable, temperature-compensated collector current for NPN transistors and FETs. It operates from 1.8 V minimum supply voltage, delivers up to 20 mA output current, exhibits 110 mV voltage drop at 10 mA, and is housed in a RoHS-compliant SOT343 package. It is used in automotive lighting drivers and precision analog biasing circuits where low-voltage operation and current stability are critical.

For engineers reviewing the BCR410WE6327HTSA1 datasheet, BCR410WE6327HTSA1 pinout, BCR410WE6327HTSA1 application, or BCR410WE6327HTSA1 equivalent, key selection criteria include its 1.8 V minimum operating voltage, 110 mV dropout at 10 mA, ±2 %/V supply sensitivity, ±0.15 %/K temperature coefficient, and AEC-Q101 qualification for automotive use.

Technical Context

This bias controller uses an internal reference and feedback loop to maintain constant output current independent of transistor h_FE variation. Its architecture enables stable biasing across battery voltage fluctuations (1.8–18 V) and ambient temperatures (−65 °C to +150 °C), with thermal shutdown protection inherent in the junction temperature limit of 150 °C.

The device functions as a two-terminal current source when configured with external sense resistor, but operates as a four-terminal active bias regulator in standard application circuits-accepting Vs, GND, Iout, and Sense inputs to decouple load current sensing from power path, minimizing error due to PCB trace resistance.

Key Specifications

Pinout & Package

SOT343 (SC-82AB) surface-mount plastic package, 4-pin, 1.6 mm × 1.6 mm footprint, 0.95 mm height, lead-free (RoHS compliant), tape-and-reel packaging (3,000 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bias controller applications.

Compared with NSI45020AZT1G and LM334Z, BCR410WE6327HTSA1 uniquely combines AEC-Q101 qualification, four-terminal sensing, and 1.8 V start-up-enabling robust, production-ready biasing in space-constrained automotive and medical systems without calibration or external compensation.

Availability

BCR410WE6327HTSA1 is available at Aetrix Electronics and suitable for automotive LED drivers, industrial sensor signal chains, consumer audio amplifiers, and medical photodiode biasing requiring stable component supply and long-term lifecycle support.

Supply support for BCR410WE6327HTSA1 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 R&D and manufacturing infrastructure.

The BCR4xx family targets precision analog biasing in harsh-environment applications, specifically engineered to replace discrete resistor-transistor bias networks in automotive lighting, sensor interfaces, and safety-critical analog front-ends.

FAQ

What is the minimum supply voltage required for regulation?

The BCR410WE6327HTSA1 begins regulating output current at 1.8 V, verified per datasheet Section "Voltage drop" and "Lowest sufficient battery voltage" (VSmin = 1.8 V). Below this, output current drops nonlinearly and is not guaranteed. This enables direct use with LiFePO₄ cells and automotive cold-crank conditions without auxiliary regulators.

Can the output current be adjusted externally?

Yes-output current is set by an external sense resistor connected between the Sense and Iout pins. The relationship is I_OUT ≈ 100 mV / R_SENSE, with typical tolerance ±5 % across temperature. Resistor values from 5 Ω to 1 kΩ yield 100 µA to 20 mA, as confirmed in the "Collector Current IC = f (Rext.)" graph on page 3 of the datasheet.

Is the Sense pin required for basic operation?

Yes-the Sense pin is mandatory for closed-loop regulation. Omitting it disables current control; the device will not regulate. The four-terminal configuration separates sensing from power delivery to eliminate PCB trace resistance errors, as specified in the "Application Circuit" diagram (page 4) and Pin Configuration table.

Does this part support reverse-polarity protection?

No-BCR410WE6327HTSA1 has no built-in reverse-polarity protection. Applying reverse voltage (>−0.3 V on Vs relative to GND) may damage the IC. External protection (e.g., series Schottky diode or MOSFET-based ideal diode) is required in battery-connected applications where polarity reversal is possible.