Infineon Technologies BCP49H6359XTMA1

Overview

BCP49H6359XTMA1 from Infineon Technologies is an NPN silicon Darlington transistor rated for 60 V V_CEO, 500 mA DC collector current, and 10,000 h_FE at I_C = 100 mA, used in automotive-grade general-purpose audio-frequency switching and amplification circuits requiring high current gain and AEC-Q101 qualification.

For engineers reviewing the BCP49H6359XTMA1 datasheet, BCP49H6359XTMA1 pinout, BCP49H6359XTMA1 application, or BCP49H6359XTMA1 equivalent, this part supports high-gain, low-base-drive switching in thermally constrained SOT223-mounted control stages for motor drivers, lamp ballasts, and power supply base drive circuits.

Technical Context

This Darlington pair integrates two NPN transistors in a single SOT223 package with emitter-follower configuration, delivering h_FE ≥ 2000 at I_C = 100 µA and ≥ 2000 at I_C = 500 mA, enabling microcontroller-level base drive for loads up to 500 mA. Its V_CE(sat) ≤ 1 V at I_C = 100 mA / I_B = 0.1 mA ensures low conduction loss in linear and switching modes.

Thermal design is supported by R_thJS ≤ 17 K/W and T_j = 150 °C maximum junction temperature, with derated P_tot = 1.5 W at T_S = 124 °C. The device meets AEC-Q101 stress testing for automotive under-hood applications and features Pb-free RoHS-compliant packaging.

Key Specifications

Pinout & Package

SOT223 surface-mount package with 4 terminals: Pin 1 = Base, Pin 2 = Collector, Pin 3 = Emitter, Pin 4 = Collector (dual-collector configuration). Exposed thermal pad on underside improves heat transfer to PCB copper.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN Darlington transistor applications.

Compared with BCP56-16TA and MMBT6427LT1G, the BCP49H6359XTMA1 uniquely combines AEC-Q101 qualification, dual-collector SOT223 construction, and h_FE ≥ 10,000 at 100 mA-making it the only option for automotive-grade, high-gain, medium-power Darlington switching in thermally demanding environments.

Availability

BCP49H6359XTMA1 is available at Aetrix Electronics and suitable for automotive lamp control, industrial relay drivers, DC motor speed control, and AC mains-referenced power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BCP49H6359XTMA1 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 and discrete devices.

The BCP49 series belongs to Infineon's automotive-qualified bipolar transistor product line, designed specifically for high-reliability, high-gain switching in engine control units, body electronics, and powertrain subsystems.

FAQ

What is the maximum continuous collector current for BCP49H6359XTMA1?

The maximum DC collector current is 500 mA at a heatsink temperature (T_S) of 124 °C. At lower board temperatures, current capability increases-e.g., up to 800 mA peak (I_CM) for short pulses (t ≤ 300 µs, duty cycle ≤ 2%). Derating curves in the datasheet define usable I_C versus T_S.

Is BCP49H6359XTMA1 pin-compatible with standard SOT223 NPN transistors?

No-it uses a 4-pin SOT223 configuration with dual collectors (Pins 2 and 4), unlike 3-pin SOT223 transistors. Pin 1 is Base, Pin 2 and Pin 4 are both Collector, and Pin 3 is Emitter. PCB layout must accommodate the fourth terminal and avoid misrouting to a 3-pin footprint.

Does BCP49H6359XTMA1 require a base resistor in all applications?

Yes-a base resistor is mandatory to limit I_B and prevent thermal runaway. For example, driving 100 mA collector current with h_FE = 10,000 requires ~10 µA base current; a 470 kΩ resistor from 5 V logic yields ~10.6 µA, well within safe operating limits. Values must be recalculated based on actual h_FE and V_CC.

Can BCP49H6359XTMA1 be used in linear amplifier mode?

It is rated for linear operation with V_CE ≤ 5 V and I_C ≤ 100 mA per datasheet test conditions, but its Darlington structure introduces higher V_BE(sat) (~1.5 V) and reduced f_T (200 MHz) compared to RF transistors. It is optimized for switching, not high-fidelity analog amplification.