Infineon Technologies BC857BWE6327BTSA1

Overview

BC857BWE6327BTSA1 from Infineon Technologies is a PNP silicon small-signal transistor designed for audio-frequency input stages and driver circuits. It delivers high DC current gain (h_FE = 220–480 at I_C = 2 mA), low V_CE(sat) (max 300 mV at I_C = 10 mA/I_B = 0.5 mA), and low noise (1 dB typical at 1 kHz, 0.2 mA). It is used in automotive sensor signal conditioning and industrial level-shifting interfaces.

For engineers reviewing the BC857BWE6327BTSA1 datasheet, BC857BWE6327BTSA1 pinout, BC857BWE6327BTSA1 application, or BC857BWE6327BTSA1 equivalent, key selection criteria include guaranteed h_FE group B performance, AEC-Q101 qualification, SOT-323 package thermal resistance (R_thJS ≤ 90 K/W), and V_CEO = 45 V rating for 12 V rail compatibility.

Technical Context

This device operates as a general-purpose PNP bipolar junction transistor with fixed emitter-base and collector-base junctions optimized for linear amplification and switching below 250 MHz. Its h_FE grouping (B) ensures consistent current amplification across production lots, and its low C_cb (1.5 pF typ) supports stable high-frequency gain up to f_T = 250 MHz.

The transistor meets AEC-Q101 stress testing requirements for automotive use, including temperature cycling, HTRB, and ESD (HBM ≥ 2 kV). Its R_thJS of ≤90 K/W (TS ≤ 128 °C) enables reliable operation in thermally constrained PCB layouts without forced airflow.

Key Specifications

Pinout & Package

BC857BWE6327BTSA1 is housed in a RoHS-compliant SOT-323 plastic package with gull-wing leads, rated for T_j = 150 °C and optimized for thermal dissipation (R_thJS ≤ 90 K/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP small-signal transistor applications.

Compared with BC857BW and MMBT3906LT1G, BC857BWE6327BTSA1 provides superior thermal performance (R_thJS ≤ 90 K/W), guaranteed h_FE spread, and full AEC-Q101 validation-making it the preferred choice for safety-critical automotive and industrial signal conditioning where reliability and parametric consistency are mandatory.

Availability

BC857BWE6327BTSA1 is available at Aetrix Electronics and suitable for automotive door modules, industrial IO expanders, consumer audio input stages, and medical sensor signal conditioning requiring stable component supply and long-term lifecycle support.

Supply support for BC857BWE6327BTSA1 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 electronics, and industrial control ICs, with global manufacturing and quality certification infrastructure.

This part belongs to Infineon's BC856–BC860 family of AEC-Q101-qualified PNP transistors, engineered specifically for robust, low-noise signal amplification and switching in automotive and industrial environments.

FAQ

What is the maximum continuous collector current for BC857BWE6327BTSA1?

The absolute maximum continuous collector current (I_C) is 100 mA at T_S ≤ 128 °C. Derating applies above this case temperature: total power dissipation drops linearly to zero at 150 °C junction temperature. Pulse operation allows up to 200 mA (I_CM) with duty cycle ≤2% and pulse width <300 µs.

Is BC857BWE6327BTSA1 pin-compatible with BC857B in SOT-23?

No-BC857BWE6327BTSA1 uses the SOT-323 package (3-pin, smaller footprint, 0.65 mm lead pitch), while BC857B in SOT-23 has 0.95 mm pitch and different thermal pad layout. Pin numbering (E-B-C) is identical, but PCB land patterns and solder reflow profiles are not interchangeable.

Does this transistor support linear (analog) operation, or is it intended only for switching?

It supports both modes: its low noise (1 dB), tight h_FE grouping, and stable h_21e (330–600) make it suitable for linear amplification in audio and sensor front-ends; simultaneously, its low V_CE(sat) (≤300 mV) and fast turn-off (C_eb = 8 pF) support efficient switching in driver applications.

What does the "W" and "E6327" suffix indicate in BC857BWE6327BTSA1?

"W" denotes the SOT-323 package variant; "E6327" is Infineon's tape-and-reel ordering code indicating 3,000 units per reel, standard moisture sensitivity level (MSL3), and RoHS-compliant plating. "BTSA1" specifies the specific reel packaging and traceability format per Infineon's internal logistics system.