Infineon Technologies BCR 133T E6327

Overview

BCR 133T E6327 from Infineon Technologies is an NPN silicon digital transistor with integrated bias resistors (R1 = R2 = 10 kΩ), designed for low-power switching, level translation, and interface circuitry in compact consumer and industrial electronics. 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, h_FE ≥ 30, and operates up to T_j = 150 °C in SOT-23 package.

For engineers reviewing the BCR 133T E6327 datasheet, BCR 133T E6327 pinout, BCR 133T E6327 application, or BCR 133T E6327 equivalent, key selection criteria include built-in resistor ratio tolerance (R1/R2 = 0.9–1.1), input on/off voltage thresholds (V_i(on) = 1–2.5 V, V_i(off) = 0.8–1.5 V), thermal resistance (R_thJS ≤ 165 K/W), and SOT-23 footprint compatibility with automated assembly.

Technical Context

This digital transistor integrates two precision 10 kΩ bias resistors (R1 from base to V_IN, R2 from base to emitter) to enable single-resistor drive logic-level interfacing without external components. Its common-emitter configuration supports direct connection to microcontroller GPIOs, with guaranteed turn-on at V_i(on) ≤ 2.5 V and reliable cutoff at V_i(off) ≥ 0.8 V under I_C = 100 µA.

The device uses a planar epitaxial silicon structure optimized for fast switching (f_T = 130 MHz typ.) and low saturation voltage. Thermal design is supported by validated junction-to-solder-point resistance (R_thJS ≤ 165 K/W) and derated power dissipation curves up to T_S = 109 °C.

Key Specifications

Pinout & Package

BCR 133T E6327 is housed in a standard SOT-23 (SC-59) plastic surface-mount package with 3 terminals and a moisture sensitivity level (MSL) of 1 per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC847B,115, BCR 133T E6327 reduces bill-of-materials and layout area by integrating bias resistors; compared with NSV133T1T1G, it offers identical electrical behavior at lower cost and without automotive qualification overhead.

Availability

BCR 133T E6327 is available at Aetrix Electronics and suitable for microcontroller interface circuits, LED driver stages, relay driver circuits, and legacy logic level translation requiring stable component supply and long-term production continuity.

Supply support for BCR 133T E6327 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, sensor, and automotive ICs, with leadership in high-reliability discrete transistors and integrated power stages.

BCR 133T E6327 belongs to Infineon's BCR family of digital transistors engineered for simplified logic interfacing in cost-sensitive, space-constrained applications across consumer, industrial, and automotive domains.

FAQ

Is BCR 133T E6327 pin-compatible with other SOT-23 digital transistors like MMBT2222A?

No. BCR 133T E6327 has Base-Emitter-Collector pinout (1-B, 2-E, 3-C) in SOT-23, whereas MMBT2222A follows standard BJT pinout (1-E, 2-B, 3-C). Swapping them causes functional failure due to reversed bias network connection. Always verify pin mapping using the official Infineon datasheet diagram.

What is the maximum recommended operating frequency for switching applications?

The BCR 133T E6327 has a typical transition frequency f_T of 130 MHz, but practical switching frequency is limited by stored charge and saturation delay. For reliable turn-off with <10% duty cycle, maximum usable frequency is ~1–2 MHz; for continuous PWM, keep below 500 kHz to maintain V_CE(sat) stability and thermal margin.

Can this device be used in linear amplifier configurations?

No. The integrated R1/R2 network fixes the base bias point and prevents external DC bias adjustment. Its electrical characteristics (e.g., h_FE min = 30, no linearity specs) and intended use case are strictly digital switching. Linear amplification requires externally biased BJTs such as BC847 or BC547 series.

Does BCR 133T E6327 require a flyback diode when driving inductive loads?

Yes. When switching relay coils or solenoids, a reverse-biased flyback diode (e.g., 1N4148) must be placed across the load to clamp inductive voltage spikes exceeding V_CEO = 50 V. The transistor itself provides no internal protection against inductive kickback.