onsemi BC212L_D75Z

Overview

BC212L_D75Z from Fairchild Semiconductor is a PNP general-purpose bipolar junction transistor (BJT) designed for low-to-medium power linear amplification and switching at collector currents up to 300 mA. It features V_CEO = 50 V, h_FE = 60–300 (at I_C = 2 mA), f_T = 200 MHz, V_CE(sat) = 0.6 V (I_C = 100 mA, I_B = 5 mA), and TO-92 package - commonly used in audio preamplifiers, sensor interface stages, and discrete logic-level translators.

For engineers reviewing the BC212L_D75Z datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain range, saturation voltage under specified drive conditions, thermal resistance (R_θJA = 200°C/W), maximum junction temperature (150°C), and emitter-base breakdown (BVEBO = 5 V).

Technical Context

The BC212L_D75Z operates as a silicon PNP BJT fabricated on Fairchild's Process 68, optimized for general-purpose analog amplification with stable h_FE across I_C = 10 µA to 100 mA. Its f_T of 200 MHz supports high-frequency small-signal gain at V_CE = 5 V and I_C = 10 mA, while V_BE(sat) = 1.1 V ensures predictable base drive requirements in switching configurations.

Thermal design is constrained by R_θJA = 200°C/W and R_θJC = 83.3°C/W, requiring careful PCB copper area allocation for continuous 300 mA operation. The device exhibits Cob = 10 pF at V_CB = 10 V, limiting high-frequency stability in tuned amplifier designs without neutralization.

Key Specifications

Pinout & Package

BC212L_D75Z is housed in a standard TO-92 plastic package with 3 leads: Emitter (E), Base (B), Collector (C). Lead identification follows JEDEC TO-92 outline: flat side facing viewer, leads down, left-to-right = E-B-C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC212L_D75Z, BC557 offers wider h_FE but reduced voltage margin, while MPSA92 trades bandwidth and noise performance for extreme V_CEO - making BC212L_D75Z optimal for balanced gain, speed, and thermal behavior in 12–24 V embedded analog stages.

Availability

BC212L_D75Z is available at Aetrix Electronics and suitable for audio preamplifiers, sensor signal conditioning circuits, and discrete logic-level translation requiring stable component supply, consistent h_FE binning, and TO-92 mechanical compatibility.

Supply support for BC212L_D75Z 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 designer and manufacturer of analog and discrete semiconductors, acquired by ON Semiconductor in 2016. Known for robust process technologies and broad legacy product portfolios.

The BC212L_D75Z belongs to Fairchild's general-purpose bipolar transistor family targeting cost-sensitive, medium-speed linear and switching applications in consumer, industrial, and automotive subsystems.

FAQ

What is the maximum continuous collector current rating for BC212L_D75Z?

The BC212L_D75Z has an absolute maximum continuous collector current (I_C) of 300 mA at T_A = 25°C. Derating is required above 25°C at 5.0 mW/°C, and operation beyond this limit risks thermal runaway or permanent junction damage. Always verify actual power dissipation using V_CE(sat) and I_C under load in the final PCB layout before committing to BC212L_D75Z in production.

Does BC212L_D75Z have a specified noise figure, and under what conditions?

Yes, BC212L_D75Z specifies a noise figure (NF) of 10 dB at I_C = 200 µA, V_CE = 5 V, f = 1 kHz, R_g = 2 kΩ, and BW = 200 Hz. This value confirms its suitability for low-noise audio preamplifier stages, though system-level noise will also depend on external resistor selection and PCB layout. The BC212L_D75Z datasheet does not provide noise data at other frequencies or bias points.

What is the pin configuration of BC212L_D75Z in the TO-92 package?

BC212L_D75Z uses the standard TO-92 package with lead order E-B-C (Emitter-Base-Collector) when viewed with the flat side facing the user and leads pointing downward. This matches JEDEC TO-92 outline and is identical to BC557 and BC558. Confirm orientation using the molded dot or notch on the package body before soldering - incorrect placement will reverse polarity and prevent BC212L_D75Z from functioning.

Can BC212L_D75Z be used in switching applications, and what is its typical V_CE(sat)?

Yes, BC212L_D75Z is qualified for switching use with V_CE(sat) = 0.6 V at I_C = 100 mA and I_B = 5 mA. This low saturation voltage minimizes conduction loss and self-heating, supporting reliable 200 mA load switching at 25°C ambient. For BC212L_D75Z in switching designs, ensure base drive exceeds 5 mA and include adequate PCB copper for thermal relief per R_θJA = 200°C/W.

What is the guaranteed minimum h_FE for BC212L_D75Z at I_C = 2 mA?

The BC212L_D75Z guarantees h_FE ≥ 60 at I_C = 2 mA, V_CE = 5 V, and T_A = 25°C. The typical value is 120, with maximum up to 300. Designers must size base resistors assuming h_FE = 60 to ensure saturation across process and temperature extremes. This h_FE specification is explicitly defined in the "DC Current Gain" section of the BC212L_D75Z datasheet.