onsemi BC212L

Overview

BC212L from Fairchild Semiconductor is a PNP general-purpose bipolar junction transistor designed for low-to-medium power linear amplification and switching in discrete analog circuits, with confirmed DC current gain (hFE) of 300 at IC = 10 µA, VCE = 5 V; VCEO = 50 V; IC(max) = 300 mA; fT = 200 MHz; and TO-92 package. It operates reliably across −55°C to +150°C junction temperature range.

For engineers reviewing the BC212L datasheet, pinout, applications, or equivalent options, key selection considerations include its PNP polarity, 50 V VCEO rating, 300 mA continuous collector current capability, 200 MHz fT bandwidth, and TO-92 mechanical compatibility in legacy amplifier, driver, and signal conditioning designs.

Technical Context

The BC212L is a silicon planar PNP transistor fabricated using Fairchild's Process 68, optimized for general-purpose linear amplification with stable hFE across bias conditions. Its small-signal current gain (hfe) is specified at 60 (IC = 2 mA), noise figure is 10 dB (IC = 200 µA, Rg = 2 kΩ), and output capacitance (Cob) is 10 pF at VCB = 10 V.

Thermal performance is defined by RθJA = 200°C/W and RθJC = 83.3°C/W, supporting operation up to 150°C junction temperature. Saturation characteristics include VCE(sat) = 0.6 V at IC = 100 mA/IB = 5 mA and VBE(sat) = 1.1 V under same conditions - critical for switch-mode efficiency validation.

Key Specifications

Pinout & Package

BC212L 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 BC177 and BC212, the BC212L offers superior low-current hFE (300 at 10 µA) and identical high-speed capability (200 MHz fT), making it optimal for precision preamplifier and low-power switching roles where gain predictability at microamp bias is critical.

Availability

BC212L is available at Aetrix Electronics and suitable for audio preamplification, LED driver switching, DC current monitoring, and relay interface applications requiring stable component supply across industrial, instrumentation, and legacy consumer electronics programs.

Supply support for BC212L 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 devices, acquired by ON Semiconductor in 2016. Its legacy products remain widely supported and qualified.

The BC212L belongs to Fairchild's general-purpose bipolar transistor family, engineered for cost-sensitive, high-reliability linear and switching functions in non-automotive industrial and consumer equipment.

FAQ

What is the maximum collector-emitter voltage rating for BC212L?

The BC212L has a guaranteed minimum collector-emitter breakdown voltage (BV_CEO) of 50 V under test condition IC = 2 mA. This defines the absolute upper limit for DC or peak AC voltage applied between collector and emitter with base open. Exceeding 50 V risks irreversible junction breakdown. Derating is recommended for reliability in high-temperature or pulsed operation per Fairchild's datasheet note 2.

Does BC212L support audio-frequency amplification?

Yes, BC212L supports audio-frequency amplification effectively due to its 200 MHz fT and 10 dB noise figure at 1 kHz. Its hFE stability across bias points and low Cob (10 pF) minimize distortion and phase shift in common-emitter preamp stages up to 20 kHz. Verified use cases include electret microphone amplifiers and tone-control buffer stages in analog audio signal chains.

What is the pin configuration of BC212L in TO-92 package?

The BC212L uses standard JEDEC TO-92 outline with flat side facing the viewer and leads pointing downward: left pin = Emitter (E), center pin = Base (B), right pin = Collector (C). This matches BC177, BC212, and other legacy PNP transistors. PCB footprints must observe this E–B–C order to avoid reverse-bias damage during assembly.

Can BC212L replace BC177 in existing designs?

BC212L can replace BC177 in most designs with verification, as both share TO-92 package and E–B–C pinout. However, BC212L offers higher VCEO (50 V vs. 45 V) and significantly higher hFE (300 vs. min 125), improving gain margin and low-current performance. Confirm voltage headroom and thermal dissipation in high-IC operation, as BC212L's RθJA remains 200°C/W.

What is the thermal resistance specification for BC212L?

The BC212L has a junction-to-ambient thermal resistance (RθJA) of 200°C/W and junction-to-case resistance (RθJC) of 83.3°C/W, measured at TA = 25°C on FR-4 board with standard pad layout. These values mean that at 300 mA IC and 0.6 V VCE(sat), ~180 mW dissipation raises junction temperature by ~36°C above ambient - well within the 150°C max TJ limit if ambient stays below 114°C.