onsemi BC212L_D27Z

Overview

BC212L_D27Z from ON Semiconductor (formerly Fairchild) is a PNP general-purpose bipolar junction transistor designed for low-to-medium power amplification and switching in discrete analog circuits, with confirmed DC current gain (h_FE) of 300 at I_C = 10 µA, V_CE = 5 V; V_CEO = 50 V; I_C = 300 mA continuous; packaged in TO-92. It is used in audio preamplifier stages, relay drivers, and level-shifting interfaces.

For engineers reviewing the BC212L_D27Z datasheet, pinout, applications, or equivalent options, key selection considerations include its PNP polarity, TO-92 mechanical compatibility, f_T = 200 MHz bandwidth capability, V_CE(sat) = 0.6 V at I_C = 100 mA/I_B = 5 mA, and thermal resistance R_θJA = 200°C/W.

Technical Context

The BC212L_D27Z operates as a silicon PNP BJT fabricated on Fairchild's Process 68, optimized for linear amplification and saturated switching. Its small-signal current gain h_fe is 60 at I_C = 2 mA, V_CE = 5 V, f = 1 kHz, and noise figure NF = 10 dB under specified conditions (I_C = 200 µA, V_CE = 5 V, R_g = 2 kΩ, BW = 200 Hz).

It exhibits V_BE(on) = 0.72 V at I_C = 2 mA, V_CE = 5 V, and Cob = 10 pF at V_CB = 10 V, f = 1 MHz - confirming suitability for medium-frequency analog signal paths and low-noise bias networks.

Key Specifications

Pinout & Package

BC212L_D27Z is housed in a through-hole TO-92 package with standard lead configuration: Emitter (E), Base (B), Collector (C) - leads arranged left-to-right as E-B-C when flat side faces viewer and leads point downward.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC212L_D27Z, BC327-40 offers higher guaranteed h_FE but reduced bandwidth, while PN2907A provides greater voltage headroom at the cost of lower typical gain - both require identical PCB footprint but differ in gain-bandwidth trade-offs and voltage safety margins.

Availability

BC212L_D27Z is available at Aetrix Electronics and suitable for audio signal conditioning, relay interface design, and discrete current mirror implementation requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production batches.

Supply support for BC212L_D27Z 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

ON Semiconductor is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The BC212L_D27Z belongs to ON Semiconductor's legacy general-purpose bipolar transistor product line, originally developed by Fairchild for cost-sensitive, high-reliability discrete analog functions in consumer and industrial equipment.

FAQ

What is the maximum collector-emitter voltage rating for BC212L_D27Z?

The BC212L_D27Z has a maximum collector-emitter voltage (V_CEO) rating of 50 V under standard test conditions (I_C = 2 mA). This rating defines the upper limit for safe operation in common-emitter configurations without risk of avalanche breakdown. Exceeding this voltage may cause irreversible device failure. The BC212L_D27Z must be operated within this limit in all designs, including those with inductive loads or transient spikes.

Does BC212L_D27Z support high-frequency amplification?

Yes, the BC212L_D27Z supports high-frequency amplification with a current gain–bandwidth product (f_T) of 200 MHz at V_CE = 5 V and I_C = 10 mA. This makes it suitable for VHF-band applications such as IF amplifiers and oscillator buffers. However, gain rolls off above f_T, so practical small-signal amplification is best limited to <100 MHz for stable phase margin. The BC212L_D27Z is not intended for GHz-range RF power stages.

What is the typical base-emitter saturation voltage for BC212L_D27Z?

The typical base-emitter saturation voltage (V_BE(sat)) for BC212L_D27Z is 1.1 V at I_C = 100 mA and I_B = 5 mA. This value reflects the forward-biased PNP junction voltage under hard saturation conditions and is critical for calculating base drive resistor values. The BC212L_D27Z requires sufficient base current to reach this condition reliably, especially in switching applications with inductive loads.

Is BC212L_D27Z available in surface-mount packaging?

No, BC212L_D27Z is exclusively offered in the through-hole TO-92 package. There is no official SMT variant (e.g., SOT-23 or SC-59) released by ON Semiconductor for this specific part number. Designers requiring surface-mount compatibility must select alternatives like the MMBT2907A or NSS2907, which are functionally similar but not pin-compatible replacements for BC212L_D27Z.

What is the thermal resistance junction-to-ambient for BC212L_D27Z?

The thermal resistance junction-to-ambient (R_θJA) for BC212L_D27Z is 200°C/W under standard free-air conditions (TA = 25°C). This value assumes no heatsinking or PCB copper area enhancement. In practice, adding 1 in² of 2-oz copper pour can reduce R_θJA by ~30°C/W. For reliable operation at full 300 mA current, the BC212L_D27Z must be thermally managed to keep junction temperature below 150°C.