Infineon Technologies BCR 129T E6327

Overview

BCR 129T E6327 from Infineon Technologies is a dual NPN silicon digital transistor in SOT363 package, featuring two galvanically isolated transistors with matched characteristics, built-in 10 kΩ bias resistor (R1), 50 V V_CEO, 100 mA I_C, and 250 mW P_tot at T_S ≤ 109°C. It serves as a compact, space-saving switch or level-shifting interface in portable logic circuits.

For engineers reviewing the BCR 129T E6327 datasheet, BCR 129T E6327 pinout, BCR 129T E6327 application, or BCR 129T E6327 equivalent, this part is selected for dual-channel discrete logic interfacing where thermal efficiency, input threshold control (V_i(on) = 0.5–1.1 V), and guaranteed h_FE (120–630) are critical to reliable low-power switching.

Technical Context

This device implements two independent NPN transistors with integrated base bias resistors (R1 = 7–13 kΩ typ.) in a single SOT363 package, enabling matched switching behavior without external bias components. Each transistor supports common-emitter operation with V_CE(sat) ≤ 0.3 V at I_C = 10 mA / I_B = 0.5 mA and f_T = 150 MHz at I_C = 10 mA / V_CE = 5 V.

Thermal design is enabled by R_thJS = 165 K/W, allowing stable operation up to T_j = 150°C. Input thresholds are defined by V_i(on) (0.5–1.1 V) and V_i(off) (0.4–1 V), supporting TTL- and CMOS-compatible logic-level drive without additional level translation.

Key Specifications

Pinout & Package

SOT363 (SC-88) 6-pin plastic package with gull-wing leads; moisture sensitivity level (MSL) 1 per JEDEC J-STD-020; RoHS-compliant and halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BCR129S and BCR129W, the BCR129T offers balanced thermal capability (R_thJS = 165 K/W) and standardized SOT363 compatibility-making it optimal for consumer-grade portable designs requiring dual-channel integration without extreme thermal or space constraints.

Availability

BCR 129T E6327 is available at Aetrix Electronics and suitable for LED driver circuits, logic level translators, low-power sensor interfaces, and compact relay drivers requiring stable component supply across production volumes.

Supply support for BCR 129T 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, automotive ICs, and discrete devices, with global manufacturing and quality certification to ISO/TS 16949 and ISO 14001.

The BCR129 series belongs to Infineon's digital transistor product line, designed specifically for replacing discrete BJT + resistor combinations in space-constrained, cost-sensitive logic interface and switching applications.

FAQ

Is BCR 129T E6327 pin-compatible with other BCR129 variants?

Yes-BCR129T uses the SOT363 package with standardized pinout (1=B1, 2=E1, 3=C1, 4=E2, 5=B2, 6=C2), matching BCR129F, BCR129L3, and BCR129W in physical layout and terminal assignment. However, thermal resistance and power derating curves differ due to package construction, so electrical performance at elevated temperature must be verified per variant.

What is the maximum recommended continuous collector current per transistor?

The absolute maximum I_C is 100 mA, but continuous operation above 50 mA per transistor requires adherence to the P_tot = f(T_S) curve: at T_S = 109°C, total package dissipation must not exceed 250 mW. For 100 mA I_C, V_CE(sat) ≤ 0.3 V limits power per transistor to ≤30 mW-well within safe operating area.

Does the internal bias resistor R1 connect only to the base, or is it shared between both transistors?

R1 is implemented as two separate 10 kΩ resistors-one connected between pin 1 (B1) and the internal base of TR1, and another between pin 5 (B2) and the internal base of TR2. There is no electrical connection between the two bias networks; each transistor operates independently with its own dedicated bias path.

Can BCR 129T E6327 be used in linear amplifier configurations?

No-it is optimized for switching operation, with guaranteed parameters (h_FE, V_CE(sat)) specified only under saturated switching conditions. The integrated R1 prevents stable DC biasing for Class-A amplification, and f_T characterization assumes common-emitter switching, not small-signal gain linearity.