onsemi BC212_D26Z

Overview

BC212_D26Z from Fairchild Semiconductor is a PNP bipolar junction transistor designed for general-purpose 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 h_FE ranging from 40 to 60 at I_C = 2 mA, commonly used in low-power audio preamplifiers and discrete logic-level interface circuits.

For engineers reviewing the BC212_D26Z datasheet, pinout, applications, or equivalent options, key selection criteria 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 guaranteed minimum h_FE at low-current bias points.

Technical Context

The BC212_D26Z operates as a silicon PNP BJT with fixed-emitter biasing capability and exhibits predictable current gain across I_C = 10 μA to 2 mA. Its 150 °C maximum junction temperature and 625 mW power dissipation support continuous operation in ambient temperatures up to 25 °C without forced cooling.

Designed on Fairchild's Process 68, the device delivers stable V_BE(on) (0.6–0.72 V) and low output capacitance (C_ob = 6 pF @ 10 V), enabling use in medium-frequency small-signal amplification and linear switching applications below 100 MHz.

Key Specifications

Pinout & Package

BC212_D26Z is housed in a through-hole TO-92 package with 3 leads. The case outline conforms to JEDEC TO-92 variant A (flat side facing viewer, leads down), and thermal performance assumes mounting on 1.6" × 1.6" × 0.06" FR-4 PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC327-40 and MPSA92, BC212_D26Z provides optimal balance of voltage rating, gain predictability, and thermal performance for 24–48 V industrial signal conditioning-without over-spec'ing voltage or sacrificing manufacturability.

Availability

BC212_D26Z is available at Aetrix Electronics and suitable for industrial control interfaces, battery-powered audio front-ends, and relay driver circuits requiring stable component supply and long-term obsolescence management.

Supply support for BC212_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 devices before its acquisition by ON Semiconductor in 2016.

The BC212_D26Z belongs to Fairchild's legacy general-purpose bipolar transistor family, engineered for cost-sensitive, medium-frequency amplification and switching in industrial and consumer equipment.

FAQ

What is the maximum continuous collector current rating for BC212_D26Z?

The BC212_D26Z has a maximum DC collector current rating of 300 mA, as specified in its Absolute Maximum Ratings table. This value assumes operation within the device's thermal limits-specifically, that junction temperature remains ≤150 °C. At ambient temperatures above 25 °C, power dissipation must be derated at 5.0 mW/°C, limiting practical I_C in high-temperature environments. The BC212_D26Z is not rated for pulsed operation beyond steady-state conditions unless validated by Fairchild's application engineering team.

Does BC212_D26Z have a documented transition frequency (f_T) specification?

No, the BC212_D26Z datasheet does not specify transition frequency (f_T). Fairchild's BC212 Rev. 1.0.0 document omits f_T characterization, confirming the device is intended for DC and low-frequency applications-typically below 100 kHz. Designers requiring RF or high-speed switching should select alternatives such as the BC557 or PN2907, which include published f_T values. The BC212_D26Z remains appropriate for audio preamps, relay drivers, and logic interfaces where bandwidth is not critical.

Can BC212_D26Z be used as a direct replacement for BC212 in existing designs?

Yes, BC212_D26Z is a valid marking variant of the original BC212 PNP transistor and shares identical electrical specifications, pinout, and TO-92 package dimensions. The "D26Z" suffix reflects Fairchild's internal date/batch code and does not indicate functional deviation. All parameters-including V_CEO = 50 V, h_FE = 40–60, and R_θJA = 200 °C/W-are unchanged from the BC212 baseline. Therefore, BC212_D26Z can be substituted into any design qualified for BC212 without circuit or layout modification.

What is the typical base-emitter on voltage for BC212_D26Z at I_C = 2 mA?

The BC212_D26Z exhibits a typical V_BE(on) of 0.72 V at V_CE = 5 V and I_C = 2 mA, with a minimum of 0.6 V under the same conditions. This parameter defines the forward voltage required to bias the base-emitter junction into conduction and directly affects base resistor calculations in switching and amplifier designs. Because V_BE(on) varies with temperature and current, designers should verify bias stability across operating conditions using the BC212_D26Z's full electrical characteristics table.

Is BC212_D26Z suitable for automotive under-hood applications?

The BC212_D26Z supports an operating junction temperature range of −55 °C to +150 °C, meeting the thermal requirements of many automotive under-hood locations. However, it lacks AEC-Q101 qualification and was not released under Fairchild's automotive product program. For production automotive systems, designers must perform full reliability validation-including HTOL, temperature cycling, and ESD testing-before deploying BC212_D26Z. The BC212_D26Z remains appropriate for prototyping and non-safety-critical aftermarket modules where formal qualification is not mandated.