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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi BC212B_J35Z

Name: BC212B_J35Z
Brand: onsemi
SKU: BC212B_J35Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC212B_J35Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: BC212B_J35Z.pdf

Description:: TRANS PNP 50V 0.1A TO-92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC212B_J35Z 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 - used in discrete audio preamplifier stages and signal-level logic interface circuits.

For engineers reviewing the BC212B_J35Z datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, 50 V V_CEO, guaranteed h_FE range at low I_C, saturation voltage under defined drive conditions, and thermal resistance of 357 °C/W in free-air operation.

Technical Context

This PNP BJT operates with emitter as common terminal in standard amplifier configurations and supports linear amplification up to f = 1 kHz with h_fe = 200–400. Its breakdown voltages (V_CEO, V_CBO, V_EBO) define safe operating limits for biasing in low-voltage analog circuits.

Thermal design requires attention to R_θJA = 357 °C/W and derating of 2.8 mW/°C above 25°C ambient; maximum power dissipation is 350 mW at T_A = 25°C. C_ob = 6 pF at V_CE = 10 V enables stable performance in audio-frequency small-signal applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum allowable collector-emitter voltage before breakdown; sets upper rail limit in PNP switch or amplifier stage.
h_FE	40–60 - DC current gain at V_CE = 5 V, I_C = 2 mA; determines base drive requirement for saturated switching.
V_CE(sat)	0.6 V - Collector-emitter voltage under forced conduction (I_C = 100 mA, I_B = 5 mA); impacts power loss and output swing in switching designs.
T_J Range	−55 to +150 °C - Validated junction temperature window; supports industrial ambient operation without derating below −40 °C.
P_D	350 mW - Total device dissipation at 25 °C ambient; defines maximum continuous power handling in TO-92 package.
C_ob	6 pF - Output capacitance at V_CE = 10 V, f = 1 MHz; contributes to high-frequency roll-off and stability margin in amplifier feedback networks.

Pinout & Package

BC212B_J35Z is housed in a through-hole TO-92 package with standardized lead configuration: Pin 1 = Collector, Pin 2 = Base, Pin 3 = Emitter (viewed with flat side facing user, leads down).

Pin/Terminal	Circuit Role	Design Meaning
1 (Collector)	Current sink node	Connected to higher-potential rail in PNP configuration; carries full load current in switching mode.
2 (Base)	Control input	Receives forward-biased current to enable conduction; requires current-limiting resistor in most applications.
3 (Emitter)	Common reference terminal	Typically tied to supply rail (e.g., V_CC) in common-emitter amplifier or switch; establishes bias reference point.

Key Features

Feature	Design Value
Guaranteed h_FE range	40–60 at I_C = 2 mA ensures predictable base drive sizing across production lots.
Low V_CE(sat)	0.6 V at I_C = 100 mA / I_B = 5 mA minimizes conduction loss in discrete switching nodes.
Low leakage	I_CBO ≤ 15 nA at V_CB = 30 V supports stable biasing in high-impedance amplifier inputs.
Audio-optimized noise	NF = 10 dB at I_C = 200 µA, R_G = 2 kΩ enables use in low-noise preamp front-ends.

Applications

Audio Preamp Stage	Level-Shifting Interface
Use Scenario: Amplifying microphone or line-level signals in battery-powered portable audio equipment. IC Role / Device Role / Timing Role: PNP BJT configured in common-emitter topology to provide voltage gain with inverted output polarity. Use Value: h_FE ≥ 40 and NF = 10 dB ensure adequate signal-to-noise ratio and gain stability at I_C = 200 µA–2 mA.	Use Scenario: Translating TTL logic outputs to higher-voltage rails (e.g., 12 V) in mixed-supply control systems. IC Role / Device Role / Timing Role: Discrete PNP switch driving pull-up loads where NPN alternatives require level-shifting circuitry. Use Value: V_CEO = 50 V and I_C = 100 mA support reliable on/off control of 12 V solenoids or LEDs without external protection.
Discrete Oscillator Core	Current Mirror Reference
Use Scenario: Building low-frequency relaxation oscillators (e.g., LED flashers, timing beacons) using RC feedback. IC Role / Device Role / Timing Role: Active element in emitter-coupled or phase-shift oscillator topologies requiring predictable turn-on threshold. Use Value: V_BE(on) = 0.6–0.72 V and tight V_CE(sat) tolerance enable repeatable timing cycle thresholds across temperature.	Use Scenario: Constructing matched current sources in analog sensor conditioning circuits with limited IC integration. IC Role / Device Role / Timing Role: One leg of a discrete two-transistor current mirror, biased at I_C = 2 mA for precision ratio tracking. Use Value: h_FE consistency and low I_CBO (≤15 nA) minimize mirror error and temperature drift in 0–70 °C operating range.

Audio Preamp Stage

Level-Shifting Interface

Use Scenario: Amplifying microphone or line-level signals in battery-powered portable audio equipment.

IC Role / Device Role / Timing Role: PNP BJT configured in common-emitter topology to provide voltage gain with inverted output polarity.

Use Value: h_FE ≥ 40 and NF = 10 dB ensure adequate signal-to-noise ratio and gain stability at I_C = 200 µA–2 mA.

Use Scenario: Translating TTL logic outputs to higher-voltage rails (e.g., 12 V) in mixed-supply control systems.

IC Role / Device Role / Timing Role: Discrete PNP switch driving pull-up loads where NPN alternatives require level-shifting circuitry.

Use Value: V_CEO = 50 V and I_C = 100 mA support reliable on/off control of 12 V solenoids or LEDs without external protection.

Discrete Oscillator Core

Current Mirror Reference

Use Scenario: Building low-frequency relaxation oscillators (e.g., LED flashers, timing beacons) using RC feedback.

IC Role / Device Role / Timing Role: Active element in emitter-coupled or phase-shift oscillator topologies requiring predictable turn-on threshold.

Use Value: V_BE(on) = 0.6–0.72 V and tight V_CE(sat) tolerance enable repeatable timing cycle thresholds across temperature.

Use Scenario: Constructing matched current sources in analog sensor conditioning circuits with limited IC integration.

IC Role / Device Role / Timing Role: One leg of a discrete two-transistor current mirror, biased at I_C = 2 mA for precision ratio tracking.

Use Value: h_FE consistency and low I_CBO (≤15 nA) minimize mirror error and temperature drift in 0–70 °C operating range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC212BL	Same die, tighter h_FE bin (60–120); otherwise identical absolute max ratings and electrical specs.	Preferred where higher and more consistent current gain is required without layout change.	Select BC212BL when designing for improved β stability across temperature or batch variation.
MPSA92	Higher V_CEO = 300 V, lower h_FE = 25–100, same TO-92 package and pinout.	Suitable for higher-voltage switching (e.g., flyback snubbers), but over-specified for low-voltage audio use.	Choose MPSA92 only if system requires >50 V collector swing; otherwise BC212B_J35Z offers better gain efficiency at 50 V.

Compared with BC212B_J35Z, BC212BL delivers higher and binned h_FE for tighter gain control, while MPSA92 trades gain consistency for extreme voltage capability - making BC212B_J35Z optimal for cost-sensitive, low-voltage linear and switching roles where 50 V rating suffices.

Availability

BC212B_J35Z is available at Aetrix Electronics and suitable for audio preamplifier stages, discrete logic-level translation interfaces, and low-frequency oscillator cores requiring stable component supply and long-term obsolescence management.

Supply support for BC212B_J35Z 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_J35Z belongs to Fairchild's legacy general-purpose PNP transistor family, engineered for cost-effective, robust amplification and switching in consumer, industrial, and instrumentation applications.

FAQ

What is the pin configuration of BC212B_J35Z?

The BC212B_J35Z uses a TO-92 package with pinout: Pin 1 = Collector, Pin 2 = Base, Pin 3 = Emitter (flat side facing user, leads pointing downward). This matches JEDEC standard TO-92 orientation and is confirmed in Fairchild's October 2002 datasheet Rev. A.

Is BC212B_J35Z suitable for switching applications?

Yes, BC212B_J35Z is qualified for switching use with V_CE(sat) = 0.6 V at I_C = 100 mA and I_B = 5 mA, and a maximum continuous collector current of 100 mA. Its PNP structure makes it ideal for high-side switching in low-voltage rails up to 50 V.

What is the maximum operating temperature for BC212B_J35Z?

The BC212B_J35Z has a specified junction temperature range of −55 °C to +150 °C. At ambient temperatures above 25 °C, power dissipation must be derated by 2.8 mW/°C, with a maximum of 350 mW at T_A = 25 °C.

Does BC212B_J35Z have documented noise performance?

Yes, BC212B_J35Z specifies a noise figure of 10 dB at V_CE = 5 V, I_C = 200 µA, f = 1 kHz, R_G = 2 kΩ, and BW = 200 Hz - confirming suitability for low-noise small-signal amplification in audio front-end designs.

How does BC212B_J35Z compare to BC212BL?

BC212B_J35Z and BC212BL share identical absolute maximum ratings and core electrical characteristics, but BC212BL is a binned version with h_FE = 60–120 (vs. 40–60 for BC212B_J35Z), enabling tighter gain control in production-critical analog circuits without changing layout or bill of materials.

BC212B_J35Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 50 V

Vce Saturation (Max) @ Ib, Ic:: 600mV @ 5mA, 100mA

Current - Collector Cutoff (Max):: 15nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 60 @ 2mA, 5V

Power - Max:: 350 mW

Frequency - Transition:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

BC212B_J35Z FAQ

1.How can I place an order for BC212B_J35Z through Aetrix?

Please submit a Request for Quotation (RFQ) for BC212B_J35Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BC212B_J35Z reliable?

The price and inventory of BC212B_J35Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC212B_J35Z is usually 5 days.

3.What payment methods are accepted for BC212B_J35Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC212B_J35Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC212B_J35Z?

BC212B_J35Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC212B_J35Z order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BC212B_J35Z?

For technical support, including BC212B_J35Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC212B_J35Z requirements.

6.How does Aetrix verify that BC212B_J35Z is sourced from the original manufacturer or authorized distributors?

All BC212B_J35Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BC212B_J35Z meets industry standards.

7.What is the process for return or replacement of BC212B_J35Z?

All BC212B_J35Z units undergo pre-shipment inspection (PSI). If there is an issue with BC212B_J35Z, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BC212B_J35Z part is unused and in its original packaging.

Return procedure for BC212B_J35Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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