onsemi BC214_J35Z

Overview

BC214_J35Z from Fairchild Semiconductor is a PNP bipolar junction transistor (BJT) designed for general-purpose amplification and switching in low-to-medium power analog and digital circuits, with V_CEO = −30 V, I_C = −500 mA continuous, h_FE = 100–400 at I_C = −10 µA to −100 mA, f_T = 200 MHz, and TO-92 package. It is commonly used in audio preamplifier stages, relay drivers, and discrete logic level translation.

For engineers reviewing the BC214_J35Z datasheet, pinout, applications, or equivalent options, key selection considerations include its PNP polarity, −30 V V_CEO rating, −500 mA I_C capability, thermal resistance of 200 °C/W, and suitability for linear amplification and saturated switching below 300 mA load.

Technical Context

The BC214_J35Z operates as a silicon PNP BJT with epitaxial planar construction, optimized for stable DC current gain across collector currents from 10 µA to 100 mA. Its f_T of 200 MHz and low noise figure (NF = 2.0 dB at 15.7 kHz) support medium-frequency analog signal amplification.

Thermal design is constrained by R_θJA = 200 °C/W and P_D = 625 mW at 25 °C, derating linearly at 5.0 mW/°C above ambient. Saturation performance is defined by V_CE(sat) = −0.25 V at I_C = −10 mA / I_B = −0.5 mA and −0.6 V at I_C = −100 mA / I_B = −5 mA.

Key Specifications

Pinout & Package

BC214_J35Z is housed in a standard through-hole TO-92 package (3.60 × 4.58 × 14.47 mm), with lead spacing matching JEDEC TO-92 outline. Pin 1 is Collector, Pin 2 is Base, Pin 3 is Emitter - verified per Fairchild Rev. A datasheet diagram and dimensioned drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC214_J35Z, BC212 offers reduced current handling and gain consistency, limiting use to light-load switching; MPSA92 trades gain stability and noise performance for extreme voltage tolerance, making it unsuitable for precision analog stages despite matching I_C rating.

Availability

BC214_J35Z is available at Aetrix Electronics and suitable for audio preamplifiers, relay driver modules, and discrete LED current sinks requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for BC214_J35Z 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The BC214_J35Z belongs to Fairchild's legacy general-purpose BJT family, engineered for cost-sensitive, medium-performance linear and switching applications in consumer, industrial, and automotive auxiliary systems.

FAQ

What is the maximum continuous collector current rating for BC214_J35Z?

The BC214_J35Z has a maximum continuous collector current (I_C) rating of −500 mA at T_A = 25 °C. This rating assumes proper PCB copper area and ambient conditions; derating applies above 25 °C per the 5.0 mW/°C thermal specification. Exceeding this current risks thermal runaway or permanent degradation of BC214_J35Z performance.

Is BC214_J35Z suitable for audio amplifier applications?

Yes, BC214_J35Z is suitable for low-noise audio preamplifier stages due to its specified noise figure of 2.0 dB at 15.7 kHz and stable h_FE across bias points. Its f_T of 200 MHz supports wide bandwidth, and V_CE(sat) ensures low distortion in Class-A configurations. For best results, pair BC214_J35Z with emitter degeneration and proper thermal layout.

What is the pin configuration of BC214_J35Z in the TO-92 package?

BC214_J35Z uses the standard TO-92 pinout: Pin 1 is Collector, Pin 2 is Base, Pin 3 is Emitter - confirmed by Fairchild's Rev. A datasheet mechanical drawing and terminal identification diagram. When viewing the flat side with leads downward, left-to-right order is Collector–Base–Emitter.

Does BC214_J35Z have a documented replacement or second-source part?

No direct second-source or pin-compatible replacement is documented by Fairchild for BC214_J35Z. While BC212 and MPSA92 serve overlapping functions, neither is pin- or gain-matched. BC214_J35Z remains a unique offering within its gain-bandwidth-leakage trade-off profile, and no manufacturer lists it as obsolete or superseded in official documentation.

What is the junction-to-ambient thermal resistance (R_θJA) of BC214_J35Z?

The junction-to-ambient thermal resistance (R_θJA) of BC214_J35Z is 200 °C/W under standard free-air test conditions (JEDEC JESD51-2). This value assumes no PCB copper heatsinking; adding 1 in² of 2-oz copper on the collector pad can reduce R_θJA by ~30–40 °C/W. Always verify BC214_J35Z junction temperature stays below 150 °C in final layout.