onsemi BC212

Overview

BC212 from Fairchild Semiconductor is a PNP general-purpose bipolar junction transistor (BJT) designed for linear amplification and switching at DC collector currents up to 300 mA. It features a 50 V V_CEO, 60 V V_CBO, and 5 V V_EBO, with DC current gain (h_FE) ranging from 40 to 60 at I_C = 2 mA, operating across –55 °C to +150 °C junction temperature range.

For engineers reviewing the BC212 datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-92 package thermal resistance (R_θJA = 200 °C/W), saturation voltage (V_CE(sat) = 0.6 V @ I_C = 100 mA), and suitability for low-to-medium power analog amplification and discrete logic-level switching circuits.

Technical Context

The BC212 operates as a silicon PNP BJT fabricated using Fairchild's Process 68, optimized for stable DC amplification and reliable switching in non-critical industrial and consumer signal paths. Its base-emitter on voltage (V_BE(on)) is specified at 0.6–0.72 V, and output capacitance (C_ob) is 6 pF at 10 V and 1 MHz - supporting moderate-frequency small-signal operation.

Thermal design must account for its 625 mW total dissipation at 25 °C, derating at 5.0 mW/°C above ambient, with R_θJC = 83.3 °C/W indicating limited case-to-heatsink conduction capability. Cut-off leakage (I_CBO, I_EBO) is tightly controlled at ≤15 nA, enabling low-power bias stability.

Key Specifications

Pinout & Package

BC212 is housed in a through-hole TO-92 package with standardized lead configuration: flat side facing viewer, leads down, left-to-right pin order is Collector (1), Base (2), Emitter (3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC327 and 2N3906, the BC212 offers the highest V_CEO (50 V) and widest operational temperature range (–55 °C to +150 °C) among these three PNP transistors, making it uniquely suitable for ruggedized industrial amplification and relay driving where voltage headroom and thermal resilience are critical.

Availability

BC212 is available at Aetrix Electronics and suitable for industrial control panels, automotive body electronics, and consumer audio equipment requiring stable component supply and long-term manufacturability.

Supply support for BC212 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 BC212 belongs to Fairchild's legacy general-purpose BJT product line, engineered for cost-sensitive, medium-power linear and switching applications in industrial, automotive, and consumer electronics.

FAQ

What is the maximum continuous collector current rating for BC212?

The BC212 has a maximum DC collector current rating of 300 mA, as specified in its Absolute Maximum Ratings table. This value assumes proper thermal management - exceeding this current without adequate heat dissipation risks junction overheating beyond the 150 °C limit. Derating is required above 25 °C ambient per the 5.0 mW/°C specification. The BC212 is not rated for pulsed operation beyond steady-state limits without factory consultation.

Does BC212 have a documented DC current gain (h_FE) range, and under what test conditions?

Yes, the BC212 specifies h_FE min = 40 and max = 60 at V_CE = 5 V and I_C = 2 mA, per its Electrical Characteristics table. A second h_FE value of ≥60 is given at I_C = 10 μA. These values reflect typical small-signal amplification behavior and should be used for bias design - actual gain in circuit depends on operating point, temperature, and unit-to-unit variation within the stated range.

What is the pin configuration of BC212 in its TO-92 package?

The BC212 uses standard TO-92 pinout: with the flat side facing the viewer and leads pointing downward, the left-to-right pin order is Collector (1), Base (2), Emitter (3). This configuration is consistent across Fairchild's BC212 Rev. 1.0.0 datasheet and verified on distributor footprint diagrams. No alternate pinouts are documented for this part number.

Can BC212 be used in switching applications, and what saturation performance does it offer?

Yes, the BC212 is qualified for switching use, with V_CE(sat) = 0.6 V and V_BE(sat) = 1.4 V specified at I_C = 100 mA and I_B = 5 mA. These values confirm robust saturation under moderate drive, enabling low-loss on-state operation. However, its unspecified transition frequency and relatively high R_θJA (200 °C/W) limit suitability to low-to-moderate speed (<100 kHz) and thermally forgiving layouts.

Is BC212 suitable for automotive under-hood applications?

Yes, the BC212 supports junction temperatures from –55 °C to +150 °C, meeting extended temperature requirements for many automotive under-hood locations. Its 50 V V_CEO and 60 V V_CBO also provide margin against load-dump transients. However, it is not AEC-Q101 qualified - system-level validation including board-level thermal testing and transient immunity assessment is required before deployment in safety-critical automotive functions.