onsemi BC212B_D26Z

Overview

BC212B_D26Z from Fairchild Semiconductor is a PNP general-purpose bipolar junction transistor (BJT) designed for low-power amplification and switching at collector currents up to 100 mA. It features V_CEO = 50 V, V_CBO = 60 V, h_FE = 40–60 (at I_C = 2 mA), V_CE(sat) = 0.6 V (I_C = 100 mA, I_B = 5 mA), and TO-92 package - commonly used in audio preamplifier stages and discrete logic interface circuits.

For engineers reviewing the BC212B_D26Z datasheet, pinout, applications, or equivalent options, key selection considerations include its PNP polarity, DC current gain range, saturation voltage under defined drive conditions, thermal resistance (R_θJA = 357 °C/W), and suitability for linear amplification versus saturated switching roles in low-voltage analog subsystems.

Technical Context

This PNP BJT operates with a maximum junction temperature of 150°C and is rated for continuous collector current of 100 mA. Its breakdown voltages - V_CEO = 50 V, V_CBO = 60 V, and V_EBO = 5 V - define safe operating limits under reverse-biased and open-circuit conditions.

Small-signal parameters include h_fe = 200–400 at I_C = 2 mA and f = 1 kHz, Cob = 6 pF at V_CE = 10 V, and NF = 10 dB under specified bias and source impedance - confirming suitability for low-noise, mid-frequency amplification where gain stability and capacitance control matter.

Key Specifications

Pinout & Package

BC212B_D26Z is housed in a standard TO-92 plastic package with 3 leads. Lead identification (viewed from flat side, leads down): Pin 1 = Collector, Pin 2 = Base, Pin 3 = Emitter.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC212A_D26Z and MPSA92, BC212B_D26Z delivers optimal balance of gain predictability, low-noise operation, and 50 V breakdown for general-purpose PNP amplification - making it preferred over high-voltage alternatives when voltage headroom is modest and signal fidelity matters.

Availability

BC212B_D26Z is available at Aetrix Electronics and suitable for audio preamplifier stages, discrete logic level shifters, and low-power analog sensor interfaces requiring stable component supply and long-term manufacturability.

Supply support for BC212B_D26Z 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 BC212B_D26Z belongs to Fairchild's legacy general-purpose BJT family, engineered for cost-effective, reliable amplification and switching in consumer, industrial, and instrumentation applications.

FAQ

What is the pin configuration of BC212B_D26Z?

The BC212B_D26Z uses a TO-92 package with standardized pinout: Pin 1 is Collector, Pin 2 is Base, and Pin 3 is Emitter - verified from Fairchild's October 2002 datasheet Rev. A. This arrangement is consistent across all BC212B variants and enables direct PCB footprint compatibility with other TO-92 PNP transistors sharing the same lead assignment.

Does BC212B_D26Z support linear amplification?

Yes, BC212B_D26Z supports linear amplification, as confirmed by its specified h_FE (40–60), V_BE(on) (0.6–0.72 V), and noise figure (10 dB) under small-signal conditions. Its design intent - stated explicitly as "general purpose amplifier" - and stable gain at I_C = 2 mA validate use in Class-A audio and sensor signal conditioning where linearity and low distortion are required.

What is the maximum power dissipation for BC212B_D26Z?

The BC212B_D26Z has a maximum total device dissipation (P_D) of 350 mW at T_A = 25°C, with a thermal derating factor of 2.8 mW/°C above ambient. This means usable power drops to ~210 mW at 75°C ambient - a critical constraint when designing for enclosed or high-temperature environments without heatsinking.

Is BC212B_D26Z RoHS compliant?

BC212B_D26Z was manufactured prior to RoHS enforcement deadlines and predates formal RoHS certification; its datasheet (Rev. A, October 2002) contains no RoHS statement. For new designs requiring compliance, consult ON Semiconductor's modern equivalents (e.g., NSS20201MR6T1G) - but BC212B_D26Z remains viable for legacy repair and non-regulated industrial applications.

Can BC212B_D26Z replace BC212B in existing designs?

Yes, BC212B_D26Z is a valid marking variant of the BC212B transistor and shares identical electrical specifications, pinout, package, and thermal characteristics per Fairchild's documentation. The "_D26Z" suffix denotes date code and assembly lot information, not functional differentiation - so BC212B_D26Z may be used as a direct replacement for BC212B in all compatible designs.