Diodes Incorporated BC847CQ-7-F

Overview

BC847CQ-7-F from Diodes Incorporated is an NPN small-signal transistor in SOT23 package, rated for V_CEO = 45 V, I_C = 100 mA, and h_FE = 420–800 at I_C = 2 mA, used in low-power switching and audio-frequency amplification stages of industrial control interfaces and sensor signal conditioning circuits.

For engineers reviewing the BC847CQ-7-F datasheet, BC847CQ-7-F pinout, BC847CQ-7-F application, or BC847CQ-7-F equivalent, key selection criteria include DC current gain consistency across temperature, V_CE(sat) ≤ 250 mV at I_C = 10 mA / I_B = 0.5 mA, ESD HBM rating of 4 kV, and automotive-compliant qualification per AEC-Q101.

Technical Context

This transistor operates as a general-purpose NPN amplifier/switch with a transition frequency f_T of 100–300 MHz at V_CE = 5 V and I_C = 10 mA, supporting AF and low-speed digital signal handling. Its complementary PNP counterpart is BC857CQ.

The device features a maximum power dissipation of 350 mW on 15 mm × 15 mm 1 oz copper PCB, with thermal resistance R_θJA = 357 °C/W and junction-to-lead R_θJL = 350 °C/W - enabling stable operation up to +150 °C ambient.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount plastic package with matte tin-plated leads, UL 94V-0 rated, moisture sensitivity level 1, weight ≈ 0.008 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC847CQ-7-F, BC847CW-7-F trades thermal performance for size reduction, while MMBT3904LT1G offers broader availability at lower gain consistency and no automotive qualification - making BC847CQ-7-F the preferred choice for temperature-stable, AEC-Q101–compliant designs.

Availability

BC847CQ-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive cabin controls, and consumer audio preamplifiers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BC847CQ-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.

The BC847CQ series belongs to Diodes' AEC-Q101–qualified small-signal transistor product line, designed specifically for automotive interior electronics and industrial control systems demanding robustness across -55 °C to +150 °C operation.

FAQ

Is BC847CQ-7-F pin-compatible with standard BC847C variants?

Yes - BC847CQ-7-F uses identical SOT23 pinout (Emitter-Base-Collector on pins 1-2-3) and shares mechanical dimensions with non-automotive BC847C-7-F. The "Q" suffix denotes AEC-Q101 qualification, not pin or footprint change.

What is the maximum allowable continuous collector current at 105 °C ambient?

At T_A = 105 °C, derating from the 350 mW maximum power dissipation yields ~200 mW usable power. With V_CE(sat) ≈ 200 mV, this supports I_C ≤ 100 mA continuously - matching the datasheet's I_C rating, which is valid up to +150 °C junction temperature.

Does BC847CQ-7-F require special PCB layout considerations for thermal performance?

Yes - to achieve the rated 350 mW power dissipation and R_θJA = 357 °C/W, Diodes specifies a 15 mm × 15 mm 1 oz copper pad on the collector pad (pin 3). Smaller pads increase thermal resistance and reduce safe operating current.

Can BC847CQ-7-F be used in linear amplifier configurations?

Yes - its f_T = 100–300 MHz, low noise figure (2–10 dB), and stable h_FE make it suitable for AF linear amplifiers. However, ensure V_CE remains ≥ 1 V and power dissipation stays within derated limits to avoid thermal runaway in Class-A biasing.