Infineon Technologies BCR 135 B6327

Overview

BCR 135 B6327 from Infineon Technologies is an NPN silicon digital transistor with integrated bias resistors (R1 = 10 kΩ, R2 = 47 kΩ), designed for switching, inverting, and interface driver functions in low-power logic-level translation circuits. It features V_CEO = 50 V, I_C = 100 mA, V_CE(sat) ≤ 0.3 V at I_C = 10 mA/I_B = 0.5 mA, and operates up to T_j = 150 °C. It is widely used in automotive body control modules for LED and relay driver stages.

For engineers reviewing the BCR 135 B6327 datasheet, BCR 135 B6327 pinout, BCR 135 B6327 application, or BCR 135 B6327 equivalent, key selection criteria include input threshold voltage (V_i(off) ≤ 1 V, V_i(on) ≤ 1.4 V), thermal resistance (R_thJS ≤ 240 K/W), AEC-Q101 qualification, and SOT23 package compatibility with automated PCB assembly.

Technical Context

This digital transistor integrates two precision bias resistors to enable direct TTL/CMOS-level signal interfacing without external components. Its R1/R2 ratio of 0.21 ensures stable saturation under varying temperature conditions (–40 °C to 125 °C) and supports reliable turn-on/turn-off behavior in pulsed load applications.

The device uses a monolithic NPN structure with defined cutoff characteristics: I_CBO ≤ 100 nA at V_CB = 40 V and I_EBO ≤ 167 µA at V_EB = 6 V. Its f_T = 150 MHz enables use in moderate-speed switching (≤ 10 MHz square-wave drive) while maintaining low input capacitance (C_cb = 3 pF).

Key Specifications

Pinout & Package

SOT23-3 plastic surface-mount package with gull-wing leads, JEDEC TO-236AB compliant, RoHS-compliant, and qualified to AEC-Q101 for automotive use.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital transistor switching applications.

Compared with BC847BW and NSVD120DP03MX, BCR 135 B6327 offers optimal balance of AEC-Q101 compliance, standardized R1/R2 ratio, and proven thermal robustness in 12–24 V automotive domains-making it the preferred choice where qualification and predictability outweigh raw gain or voltage headroom.

Availability

BCR 135 B6327 is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC input conditioning, and medical status indicator circuits requiring stable component supply across multi-year production cycles.

Supply support for BCR 135 B6327 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 is a German semiconductor manufacturer specializing in power management, automotive ICs, and industrial control solutions, with global manufacturing and quality certification to ISO/TS 16949 and IATF 16949.

The BCR series belongs to Infineon's automotive-qualified digital transistor product line, engineered specifically for robust, resistor-equipped switching in harsh-environment control nodes-replacing discrete BJT + resistor combinations in body electronics and powertrain subsystems.

FAQ

Is BCR 135 B6327 pin-compatible with standard SOT23 NPN transistors like BC847?

No. While both use SOT23-3 packages, BCR 135 B6327 has internal bias resistors connecting Pin 1 (B) to R1 and R2, whereas BC847 has bare base/emitter/collector terminals. Direct substitution without circuit redesign will cause incorrect biasing or failure to saturate.

What is the maximum allowable continuous collector current at 85 °C ambient?

At T_A = 85 °C, derating applies: P_tot = 200 mW at T_S ≤ 102 °C. Using R_thJA ≈ 350 K/W (typical for 2-layer FR4), maximum I_C is ~75 mA at V_CE(sat) = 0.3 V to maintain junction temperature below 150 °C.

Does BCR 135 B6327 support PWM dimming of LEDs at 1 kHz?

Yes. With f_T = 150 MHz and t_off < 100 ns (inferred from V_CE(sat) and C_cb), it fully supports 1 kHz PWM with >99.9% duty-cycle fidelity. Thermal limits (P_tot = 200 mW) allow 100 mA average current only if peak current is limited to 150 mA with ≤67% duty cycle.

How does the R1/R2 ratio affect switching behavior in noisy environments?

The fixed R1/R2 = 0.21 ratio stabilizes the effective input impedance and improves noise immunity: it raises the effective V_i(off) threshold relative to V_i(on), widening the noise margin to ≥0.5 V at 25 °C-critical for reliable operation near motors or solenoids emitting broadband EMI.