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

onsemi BC212LB_D74Z

Name: BC212LB_D74Z
Brand: onsemi
SKU: BC212LB_D74Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC212LB_D74Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BC212LB_D74Z.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC212LB_D74Z 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 operates across –55°C to +150°C - used in discrete audio preamplifier stages and signal-level logic interface circuits.

For engineers reviewing the BC212LB_D74Z datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-92 package, PNP polarity, DC current gain range, saturation voltage under defined drive conditions, and thermal resistance (R_θJA = 357°C/W) for ambient-limited linear operation.

Technical Context

The BC212LB_D74Z is a silicon planar PNP transistor fabricated using Fairchild's Process 68, optimized for general-purpose linear amplification and low-speed switching. Its structure supports stable h_FE over I_C = 10 µA to 2 mA and exhibits low output capacitance (C_ob = 6 pF at V_CE = 10 V, f = 1 MHz), enabling use in audio-frequency small-signal amplifiers.

Thermal design is constrained by R_θJA = 357°C/W and P_D = 350 mW at T_A = 25°C, with derating of 2.8 mW/°C above ambient. The device's noise figure is specified at 10 dB (V_CE = 5 V, I_C = 200 µA, R_G = 2 kΩ, BW = 200 Hz), confirming suitability for low-noise preamp front-ends where signal integrity is critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum allowable collector-emitter voltage before breakdown; defines safe operating voltage headroom in common-emitter amplifier configurations.
h_FE	40–60 - DC current gain range at V_CE = 5 V, I_C = 2 mA; determines base drive requirements for saturated switching or linear biasing.
V_CE(sat)	0.6 V - Collector-emitter voltage under forced conduction (I_C = 100 mA, I_B = 5 mA); directly impacts power loss and efficiency in switching applications.
P_D	350 mW - Total power dissipation at 25°C ambient; sets maximum continuous power handling without heatsinking in TO-92 packages.
R_θJA	357°C/W - Junction-to-ambient thermal resistance; indicates temperature rise per milliwatt in still-air PCB mounting, limiting usable power at elevated ambient temperatures.
C_ob	6 pF - Output capacitance at V_CE = 10 V, 1 MHz; affects high-frequency gain roll-off and stability in RF-coupled or broadband amplifier designs.

Pinout & Package

BC212LB_D74Z is housed in a standard TO-92 plastic package with lead configuration: Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base (viewed with flat side facing outward, leads down).

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal for PNP operation	Connected to most positive rail in common-emitter switch; polarity reversal relative to NPN devices requires complementary bias network design.
2 (Collector)	Output current terminal	Drives load to ground in switching mode; in amplification, connects to load resistor and supply rail via pull-up.
3 (Base)	Control input for minority-carrier injection	Requires current-limited drive (e.g., series resistor) to achieve target I_C; base-emitter on-voltage is 0.6–0.72 V at I_C = 2 mA.

Key Features

Feature	Design Value
Low saturation voltage	V_CE(sat) = 0.6 V enables <100 mW conduction loss at 100 mA, improving efficiency in battery-powered switch-mode interfaces.
Stable DC current gain	h_FE = 40–60 across I_C = 10 µA–2 mA supports predictable biasing in Class-A preamplifiers without active feedback compensation.
Low noise performance	NF = 10 dB at 1 kHz with 200 µA collector current allows use in microphone preamp inputs where SNR > 60 dB is required.
Wide operating temperature	T_J = –55°C to +150°C supports deployment in automotive cabin electronics and industrial control modules exposed to thermal cycling.

Applications

Audio Preamp Stage	Level-Shifting Interface
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors in portable voice recorders. IC Role / Device Role / Timing Role: PNP BJT configured in common-emitter topology to provide 20–30 dB voltage gain with minimal distortion. Use Value: Low V_BE(on) (0.6–0.72 V) and h_FE consistency enable stable DC biasing from single 3.3 V or 5 V rails without trimming resistors.	Use Scenario: Translating TTL/CMOS logic outputs to higher-voltage analog control lines in mixed-signal instrumentation. IC Role / Device Role / Timing Role: Discrete PNP switch driving 12 V analog multiplexer enable pins from 3.3 V microcontroller GPIOs. Use Value: V_CEO = 50 V and I_C = 100 mA rating allow reliable operation with 12–24 V loads while maintaining fast turn-off due to low C_ob (6 pF).
Discrete Power Switch	Current Mirror Reference
Use Scenario: Controlling LED arrays or small solenoids in HVAC control panels with microcontroller-based PWM. IC Role / Device Role / Timing Role: Saturated PNP switch sinking load current to ground when base is pulled low. Use Value: V_CE(sat) = 0.6 V limits power dissipation to ≤60 mW at 100 mA, avoiding thermal runaway in unheatsinked TO-92 mounting.	Use Scenario: Building matched current sources in analog sensor conditioning circuits requiring precise 1:1 current replication. IC Role / Device Role / Timing Role: One BC212LB_D74Z as reference transistor, second as output transistor in emitter-coupled pair configuration. Use Value: Tight h_FE spread (40–60) and low I_CBO (15 nA) minimize mismatch error and drift over temperature in precision current mirrors.

Audio Preamp Stage

Level-Shifting Interface

Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors in portable voice recorders.

IC Role / Device Role / Timing Role: PNP BJT configured in common-emitter topology to provide 20–30 dB voltage gain with minimal distortion.

Use Value: Low V_BE(on) (0.6–0.72 V) and h_FE consistency enable stable DC biasing from single 3.3 V or 5 V rails without trimming resistors.

Use Scenario: Translating TTL/CMOS logic outputs to higher-voltage analog control lines in mixed-signal instrumentation.

IC Role / Device Role / Timing Role: Discrete PNP switch driving 12 V analog multiplexer enable pins from 3.3 V microcontroller GPIOs.

Use Value: V_CEO = 50 V and I_C = 100 mA rating allow reliable operation with 12–24 V loads while maintaining fast turn-off due to low C_ob (6 pF).

Discrete Power Switch

Current Mirror Reference

Use Scenario: Controlling LED arrays or small solenoids in HVAC control panels with microcontroller-based PWM.

IC Role / Device Role / Timing Role: Saturated PNP switch sinking load current to ground when base is pulled low.

Use Value: V_CE(sat) = 0.6 V limits power dissipation to ≤60 mW at 100 mA, avoiding thermal runaway in unheatsinked TO-92 mounting.

Use Scenario: Building matched current sources in analog sensor conditioning circuits requiring precise 1:1 current replication.

IC Role / Device Role / Timing Role: One BC212LB_D74Z as reference transistor, second as output transistor in emitter-coupled pair configuration.

Use Value: Tight h_FE spread (40–60) and low I_CBO (15 nA) minimize mismatch error and drift over temperature in precision current mirrors.

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
BC212L	No suffix variant; identical electrical specs and TO-92 package; D74Z denotes tape-and-reel packaging per Fairchild's internal ordering code.	No functional difference; same pinout, gain, and voltage ratings; suitable for identical circuit roles.	Select BC212L for non-tape-and-reel procurement or legacy BOM alignment where packaging format is not constrained.
MPSA92	Higher V_CEO = 300 V, lower h_FE = 25–100, similar V_CE(sat) = 0.5 V; TO-92 package with same pinout (E-C-B).	Better suited for high-voltage switching (e.g., flyback snubbers), less optimal for low-noise audio due to wider h_FE spread and no NF spec.	Choose MPSA92 only when >100 V collector swing is required; avoid in noise-sensitive preamps unless gain variation is acceptable.

Compared with BC212L, BC212LB_D74Z offers identical core performance in tape-and-reel form for automated assembly; versus MPSA92, it trades off voltage headroom for tighter gain control and documented noise performance - making it preferable for low-voltage, low-noise linear amplification where 50 V ceiling is sufficient.

Availability

BC212LB_D74Z is available at Aetrix Electronics and suitable for audio preamplifier stages, level-shifting interfaces, discrete power switches, and current mirror references requiring stable component supply and long-term obsolescence management.

Supply support for BC212LB_D74Z 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 designer and manufacturer of analog and discrete semiconductors, acquired by ON Semiconductor in 2016. Known for robust process technologies and broad portfolio coverage.

The BC212LB_D74Z belongs to Fairchild's general-purpose bipolar transistor family, engineered for cost-effective, reliable amplification and switching in consumer, industrial, and automotive auxiliary electronics where TO-92 footprint and moderate performance are prioritized.

FAQ

What is the pin configuration of BC212LB_D74Z?

The BC212LB_D74Z uses a TO-92 package with standardized pinout: Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base, viewed with flat side facing outward and leads pointing downward. This matches JEDEC TO-92 mechanical specification and ensures compatibility with existing PCB footprints for PNP transistors in that outline.

Is BC212LB_D74Z suitable for audio amplifier applications?

Yes, BC212LB_D74Z is explicitly designated as a PNP general-purpose amplifier with noise figure of 10 dB at 1 kHz and stable h_FE across low collector currents. Its V_BE(on) = 0.6–0.72 V and low C_ob = 6 pF support clean, low-distortion amplification in microphone preamp and line-level stages - confirmed in Fairchild's original application guidance for BC212LB_D74Z.

What is the maximum power dissipation of BC212LB_D74Z at 70°C ambient?

At T_A = 70°C, BC212LB_D74Z derates from 350 mW at 25°C by 2.8 mW/°C × (70 − 25) = 126 mW, yielding P_D = 224 mW. This limit assumes still-air conditions and standard PCB mounting; exceeding it risks junction temperature exceeding 150°C, triggering thermal degradation of BC212LB_D74Z performance.

Does BC212LB_D74Z have a documented replacement or cross-reference?

BC212LB_D74Z is functionally identical to BC212L, differing only in packaging (D74Z = tape-and-reel). No official drop-in replacement exists outside Fairchild's own part numbering; however, MPSA92 is a widely used alternative with higher voltage rating but broader h_FE tolerance - verified in distributor cross-reference tools and application notes referencing BC212LB_D74Z.

What is the guaranteed h_FE range for BC212LB_D74Z at I_C = 100 mA?

The datasheet specifies h_FE only at I_C = 10 µA and I_C = 2 mA (min 40, typ 60). At I_C = 100 mA, h_FE is not characterized or guaranteed for BC212LB_D74Z; operation at that current is limited to saturation switching, where h_FE is intentionally exceeded by forced β (I_B/I_C = 5%) - consistent with BC212LB_D74Z's intended use case.

BC212LB_D74Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Box (TB)

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

BC212LB_D74Z FAQ

1.How can I place an order for BC212LB_D74Z through Aetrix?

Please submit a Request for Quotation (RFQ) for BC212LB_D74Z 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 BC212LB_D74Z reliable?

The price and inventory of BC212LB_D74Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC212LB_D74Z is usually 5 days.

3.What payment methods are accepted for BC212LB_D74Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC212LB_D74Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC212LB_D74Z?

BC212LB_D74Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC212LB_D74Z 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 BC212LB_D74Z?

For technical support, including BC212LB_D74Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC212LB_D74Z requirements.

6.How does Aetrix verify that BC212LB_D74Z is sourced from the original manufacturer or authorized distributors?

All BC212LB_D74Z 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 BC212LB_D74Z meets industry standards.

7.What is the process for return or replacement of BC212LB_D74Z?

All BC212LB_D74Z units undergo pre-shipment inspection (PSI). If there is an issue with BC212LB_D74Z, 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 BC212LB_D74Z part is unused and in its original packaging.

Return procedure for BC212LB_D74Z:

1.Submit a request within 90 days.

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

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