Nexperia USA Inc. BC856A-QR

Overview

BC856A-QR from Nexperia is a PNP general-purpose bipolar junction transistor in SOT23 (TO-236AB) package, rated for −65 V V_CEO, −100 mA I_C, and DC current gain (h_FE) of 125–250 at V_CE = −5 V and I_C = −2 mA. It serves as a low-voltage switching or linear amplification element in automotive signal conditioning and power control stages.

For engineers reviewing the BC856A-QR datasheet, BC856A-QR pinout, BC856A-QR application, or BC856A-QR equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (500 K/W), saturation voltage (−250 mV min at I_C = −100 mA), and precise SOT23 terminal mapping - all critical for automotive-grade PCB layout and reliability validation.

Technical Context

This PNP BJT operates with an emitter-base breakdown voltage of −5 V and collector-base breakdown voltage of −80 V, supporting robust reverse-bias margin in automotive supply-rail interfaces. Its h_FE range (125–250) ensures predictable base drive requirements across temperature (−65 °C to +150 °C).

The device exhibits V_CE(sat) ≤ −250 mV at I_C = −100 mA / I_B = −5 mA and f_T = 100 MHz, enabling use in medium-speed switching (e.g., LED drivers, relay coils) while maintaining low conduction loss and adequate bandwidth for feedback loops.

Key Specifications

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; 1.9 mm × 1.1 mm footprint, 0.45 mm lead pitch, and 0.9 mm height - optimized for high-density automotive PCB assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose transistor applications.

Compared with BC856A-QR, BC857A-Q trades 20 V V_CEO margin for identical gain range in lower-voltage domains, while BC856B-Q retains full voltage rating but doubles h_FE span - impacting base-resistor selection rigor and worst-case saturation behavior.

Availability

BC856A-QR is available at Aetrix Electronics and suitable for automotive door modules, industrial sensor interfaces, dashboard LED drivers, and power supply enable control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BC856A-QR 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

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

The BC856A-QR belongs to Nexperia's AEC-Q101-qualified general-purpose transistor family, engineered specifically for robust, cost-effective switching and amplification in harsh automotive environments.

FAQ

What is the maximum allowable junction temperature for BC856A-QR?

The absolute maximum junction temperature (T_j) is 150 °C, as defined in the limiting values table. Operation at this limit requires strict thermal management - e.g., keeping ambient temperature ≤25 °C with no additional heatsinking - since R_th(j-a) is 500 K/W on standard FR4 PCB.

Is BC856A-QR suitable for reverse-battery protection circuits?

No. While its −80 V V_CBO and −5 V V_EBO provide reverse-bias tolerance, BC856A-QR lacks integrated protection features like integrated diodes or clamping. It may be used as a controlled switch in such circuits only when paired with external TVS or Schottky diodes to limit reverse voltage across terminals.

How does the h_FE of BC856A-QR vary with temperature?

h_FE increases with rising temperature: typical curves show ~2× higher gain at 150 °C versus −55 °C for the same I_C. At I_C = −2 mA and V_CE = −5 V, h_FE remains within 125–250 across −65 °C to +150 °C, but design must account for gain drift in precision bias networks.

Can BC856A-QR replace BC856A in non-automotive designs?

Yes - BC856A-QR is functionally identical to BC856A except for AEC-Q101 qualification and enhanced process controls. Its electrical specs, pinout, and package match exactly, making it a drop-in upgrade for existing BC856A designs where automotive reliability or extended temperature compliance is later required.