onsemi BC214L_L34Z

Overview

BC214L_L34Z from Fairchild Semiconductor is a PNP general-purpose bipolar junction transistor (BJT) designed for 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 at I_C = −10 µA, f_T = 200 MHz, and TO-92 package - used in audio preamplifiers, discrete logic inverters, and load-switching stages.

For engineers reviewing the BC214L_L34Z datasheet, pinout, applications, or equivalent options, key selection considerations include its PNP polarity, −30 V V_CEO rating, −500 mA I_C capability, 200 MHz f_T, and TO-92 mechanical compatibility with legacy through-hole designs requiring discrete gain control or signal inversion.

Technical Context

This PNP BJT operates with reverse-polarity biasing: emitter is most positive, collector most negative in active mode. Its DC current gain (h_FE) varies from 100 to 400 across I_C = −10 µA to −100 mA, supporting both small-signal amplification and saturated switching. V_BE(sat) = −1.1 V at I_C = −100 mA / I_B = −5 mA confirms robust turn-on under moderate drive.

Thermal design relies on R_θJA = 200 °C/W and P_D = 625 mW at T_A = 25 °C, derating 5.0 mW/°C above ambient - suitable for non-heat-sinked PCB layouts. Noise figure of 2.0 dB at 15.7 kHz and 200 µA enables use in low-noise preamp front-ends where base-current stability matters.

Key Specifications

Pinout & Package

BC214L_L34Z is housed in a standard TO-92 plastic package with 3 leads, lead spacing 1.27 mm, body length 4.58 mm, and defined pin 1 = Emitter, pin 2 = Collector, pin 3 = Base per JEDEC TO-92 outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC214L_L34Z, BC212L trades V_CEO and h_FE margin for lower cost, while MPSA92 adds excessive voltage headroom and gain variability - making BC214L_L34Z optimal for 12–24 V analog and digital switching where precision, noise, and thermal predictability matter.

Availability

BC214L_L34Z is available at Aetrix Electronics and suitable for audio preamplifiers, discrete logic inverters, and relay driver circuits requiring stable component supply, long-term manufacturability, and through-hole assembly compatibility.

Supply support for BC214L_L34Z 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 BC214L_L34Z belongs to Fairchild's legacy "FACT Quiet Series™" PNP BJT family, engineered for low-noise amplification and reliable switching in consumer, industrial, and communication equipment where thermal stability and parameter consistency were critical.

FAQ

What is the maximum collector-emitter voltage rating for BC214L_L34Z?

The BC214L_L34Z has a maximum collector-emitter voltage (V_CEO) rating of −30 V at T_A = 25 °C. This rating is defined with I_C = −2 mA and I_B = 0, and reflects the device's ability to block reverse voltage in common-emitter configurations. Exceeding this value risks avalanche breakdown and permanent damage to the BC214L_L34Z junction.

Does BC214L_L34Z support linear amplification applications?

Yes, BC214L_L34Z supports linear amplification due to its specified noise figure (2.0 dB at 15.7 kHz), 200 MHz f_T, and stable h_FE across bias points. It is commonly used in Class-A audio preamplifier stages where low distortion and predictable gain are required - confirmed by its characterization in the BC214L_L34Z datasheet under small-signal conditions.

What is the pin configuration of BC214L_L34Z in the TO-92 package?

The BC214L_L34Z uses a standard TO-92 package with pin 1 = Emitter, pin 2 = Collector, pin 3 = Base when viewed with flat side facing outward and leads pointing downward. This configuration is explicitly documented in the BC214L_L34Z datasheet's package diagram and matches JEDEC TO-92 mechanical standards for PNP devices.

Can BC214L_L34Z replace BC212L in existing designs?

BC214L_L34Z can replace BC212L in most cases due to identical TO-92 packaging, same I_C rating (−500 mA), and overlapping h_FE range - but BC214L_L34Z offers superior V_CEO (−30 V vs. −25 V) and higher minimum h_FE (100 vs. 85). Review transient margins in the BC214L_L34Z application before substitution to confirm adequate voltage headroom.

What thermal derating applies to BC214L_L34Z above 25°C ambient?

BC214L_L34Z has a thermal derating factor of 5.0 mW/°C above 25°C ambient temperature. Its maximum power dissipation drops linearly from 625 mW at 25°C to zero at 150°C junction temperature. This derating is based on R_θJA = 200 °C/W and must be applied in layout thermal analysis for BC214L_L34Z to avoid exceeding T_J = 150 °C.