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

onsemi BC547_J22Z

Name: BC547_J22Z
Brand: onsemi
SKU: BC547_J22Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC547_J22Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BC547_J22Z.pdf

Description:: TRANS NPN 45V 0.1A TO-92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC547_J22Z from ON Semiconductor is a general-purpose NPN epitaxial silicon transistor used for low-power switching and amplification in discrete analog and digital circuits. It features V_CEO = 45 V, I_C = 100 mA, P_C = 500 mW, h_FE = 200–450 (Class B), and TO-92 package - commonly deployed in signal conditioning stages of sensor interfaces and microcontroller I/O drivers.

For engineers reviewing the BC547_J22Z datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain classification, saturation voltage at defined drive conditions, noise figure in audio preamp use, and thermal derating behavior in PCB-constrained layouts.

Technical Context

This device operates as a bipolar junction transistor with epitaxial base construction, optimized for linear amplification and saturated switching. Its h_FE range (200–450) and low V_CE(sat) (≤250 mV at I_C = 10 mA / I_B = 0.5 mA) support stable biasing in Class-A amplifiers and reliable on/off control in logic-level interfacing.

Designed for ambient operation up to +150°C junction temperature, it uses standard TO-92 leadframe metallurgy and conforms to JEDEC TO-92 mechanical specifications. The BC547_J22Z belongs to the BC546–BC550 family, where BC547 variants are differentiated by h_FE grade and maximum voltage ratings - BC547B specifically targets mid-gain, mid-voltage applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum collector-emitter voltage before breakdown; sets safe operating range for 24 V rail switching and 36 V transient-tolerant designs.
I_C (DC)	100 mA - Continuous collector current limit; defines max load drive capability without forced cooling or derating.
P_C	500 mW - Total power dissipation at T_A = 25°C; requires thermal design margin above ~250 mW in enclosed enclosures.
h_FE	200–450 (Class B) - DC current gain range at V_CE = 5 V, I_C = 2 mA; enables predictable base resistor sizing for consistent switching thresholds.
V_CE(sat)	≤250 mV at I_C = 10 mA / I_B = 0.5 mA - Low saturation voltage ensures minimal power loss and heat generation in switch-mode operation.
f_T	300 MHz - Current gain bandwidth product at V_CE = 5 V, I_C = 10 mA; supports small-signal amplification up to ~100 MHz with adequate gain margin.
NF	2.0–10.0 dB - Noise figure at V_CE = 5 V, I_C = 200 μA, f = 1 kHz, R_G = 2 kΩ; suitable for low-noise preamplifier stages in audio and sensor front-ends.

Pinout & Package

BC547_J22Z is housed in a standard through-hole TO-92 package with straight leads (JEDEC TO-92 compliant), featuring three terminals: Collector (Pin 1), Base (Pin 2), Emitter (Pin 3). The package provides mechanical robustness and thermal dissipation suitable for manual soldering and wave soldering processes.

Pin/Terminal	Circuit Role	Design Meaning
1 (Collector)	Current sink node	Connected to load or higher-potential rail; carries full output current and must be routed with appropriate trace width for 100 mA DC.
2 (Base)	Control input	Receives forward-biased current to enable conduction; requires series resistor to limit I_B and ensure saturation under worst-case h_FE.
3 (Emitter)	Current source node	Typically tied to ground or reference potential; forms return path for collector current and defines emitter-follower output impedance.

Key Features

Feature	Design Value
High-voltage tolerance	V_CEO = 45 V enables use in 24 V industrial control systems and automotive body electronics with transient headroom.
Mid-range h_FE classification	Class B (200–450) balances gain stability and consistency across production lots, reducing need for binning in volume manufacturing.
Low V_CE(sat)	≤250 mV at rated I_C/I_B minimizes power loss and self-heating during sustained switching, improving reliability in fan control or relay driver circuits.
TO-92 mechanical standardization	JEDEC-compliant footprint allows direct replacement with BC546/BC548/BC549 and simplifies inventory management across legacy designs.
Low-noise performance	NF = 2.0–10.0 dB at 1 kHz supports clean amplification in microphone preamps and precision instrumentation front-ends without added filtering.

Applications

Audio Preamp Stage	Microcontroller GPIO Driver
Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors before ADC sampling. IC Role / Device Role / Timing Role: Discrete NPN amplifier in common-emitter configuration with emitter degeneration for linearity and gain control. Use Value: Low noise figure (2.0–10.0 dB) and stable h_FE ensure high SNR and repeatable gain calibration across temperature and unit variance.	Use Scenario: Driving LEDs, small relays, or MOSFET gates from 3.3 V or 5 V microcontroller outputs. IC Role / Device Role / Timing Role: Low-side switch with base-controlled saturation, providing galvanic isolation between MCU and load. Use Value: V_CE(sat) ≤250 mV at I_C = 10 mA ensures minimal voltage drop and heat rise, enabling reliable 100% duty-cycle operation.
Linear Voltage Regulator Pass Element	Signal Level Shifting
Use Scenario: Acting as pass transistor in adjustable 5–12 V linear regulators using LM317 feedback networks. IC Role / Device Role / Timing Role: Series-pass element regulating output current while dissipating excess power as heat. Use Value: P_C = 500 mW and T_J(max) = 150°C allow safe operation at ~250 mW dissipation with standard PCB copper area, avoiding heatsinks in low-current designs.	Use Scenario: Translating logic levels between 3.3 V microcontrollers and 5 V peripherals (e.g., UART lines, SPI slaves). IC Role / Device Role / Timing Role: Active pull-up/pull-down stage configured as emitter follower or common-base level translator. Use Value: High f_T (300 MHz) and low C_ob (3.5–6.0 pF) preserve signal edge integrity up to 10 Mbps, minimizing timing skew in bidirectional data paths.

Audio Preamp Stage

Microcontroller GPIO Driver

Use Scenario: Amplifying weak signals from electret microphones or piezoelectric sensors before ADC sampling.

IC Role / Device Role / Timing Role: Discrete NPN amplifier in common-emitter configuration with emitter degeneration for linearity and gain control.

Use Value: Low noise figure (2.0–10.0 dB) and stable h_FE ensure high SNR and repeatable gain calibration across temperature and unit variance.

Use Scenario: Driving LEDs, small relays, or MOSFET gates from 3.3 V or 5 V microcontroller outputs.

IC Role / Device Role / Timing Role: Low-side switch with base-controlled saturation, providing galvanic isolation between MCU and load.

Use Value: V_CE(sat) ≤250 mV at I_C = 10 mA ensures minimal voltage drop and heat rise, enabling reliable 100% duty-cycle operation.

Linear Voltage Regulator Pass Element

Signal Level Shifting

Use Scenario: Acting as pass transistor in adjustable 5–12 V linear regulators using LM317 feedback networks.

IC Role / Device Role / Timing Role: Series-pass element regulating output current while dissipating excess power as heat.

Use Value: P_C = 500 mW and T_J(max) = 150°C allow safe operation at ~250 mW dissipation with standard PCB copper area, avoiding heatsinks in low-current designs.

Use Scenario: Translating logic levels between 3.3 V microcontrollers and 5 V peripherals (e.g., UART lines, SPI slaves).

IC Role / Device Role / Timing Role: Active pull-up/pull-down stage configured as emitter follower or common-base level translator.

Use Value: High f_T (300 MHz) and low C_ob (3.5–6.0 pF) preserve signal edge integrity up to 10 Mbps, minimizing timing skew in bidirectional data paths.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC547BTA	Same die, identical h_FE Class B, TO-92 package, but supplied in ammo packaging instead of bulk.	No functional difference; differs only in packaging format and reel/tape compatibility for automated assembly.	Select BC547BTA when requiring tape-and-reel or ammo-packaged units for SMT-compatible through-hole placement equipment.
PN2222A	Higher V_CEO (40 V vs. 45 V), lower h_FE min (100 vs. 200), same TO-92 package and pinout.	Suitable for lower-gain, higher-current switching where tighter h_FE tolerance is not required.	Choose PN2222A only if design tolerates wider h_FE spread and reduced voltage margin; not a drop-in replacement for BC547_J22Z in gain-critical circuits.

Compared with BC547BTA and PN2222A, BC547_J22Z offers superior h_FE consistency and higher V_CEO, making it preferable for precision biasing and 24 V system interfacing - whereas BC547BTA matches exactly in electrical behavior, and PN2222A trades gain and voltage headroom for broader legacy availability.

Availability

BC547_J22Z is available at Aetrix Electronics and suitable for audio preamplifiers, microcontroller I/O drivers, linear regulator pass elements, and signal level-shifting circuits requiring stable component supply and long-term obsolescence management.

Supply support for BC547_J22Z 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

ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and discrete solutions for automotive, industrial, and consumer applications.

The BC547_J22Z belongs to ON Semiconductor's legacy general-purpose transistor product line, originally developed by Fairchild Semiconductor and maintained for backward-compatible replacements in cost-sensitive, high-volume linear and switching applications.

FAQ

What is the h_FE range specified for BC547_J22Z?

The BC547_J22Z is classified as a Class B transistor with a confirmed DC current gain (h_FE) range of 200 to 450 at V_CE = 5 V and I_C = 2 mA. This range is validated per the original Fairchild BC547 datasheet Rev. 1.1.1 and remains applicable to BC547_J22Z as a direct lineage part within the ON Semiconductor portfolio.

Does BC547_J22Z have the same pinout as other TO-92 NPN transistors like PN2222A?

Yes, BC547_J22Z uses the standard TO-92 pinout: Pin 1 = Collector, Pin 2 = Base, Pin 3 = Emitter - matching PN2222A and most JEDEC-compliant TO-92 NPN devices. However, electrical parameters such as h_FE, V_CEO, and V_CE(sat) differ, so functional substitution requires circuit validation.

What is the maximum junction temperature for BC547_J22Z?

The absolute maximum junction temperature (T_J) for BC547_J22Z is 150°C, as specified in the Fairchild/ON Semiconductor datasheet. Derating begins above 25°C ambient, with thermal resistance θ_JA ≈ 200°C/W typical for TO-92 on standard FR-4 PCBs - meaning power dissipation must be reduced by ~2.5 mW/°C above 25°C ambient.

Can BC547_J22Z be used in low-noise audio applications?

Yes, BC547_J22Z has a documented noise figure of 2.0–10.0 dB at V_CE = 5 V, I_C = 200 μA, f = 1 kHz, and R_G = 2 kΩ, making it suitable for low-noise preamplifier stages. Its performance is comparable to BC549/BC550 in this regard, though not as low-noise as those dedicated low-noise variants.

Is BC547_J22Z RoHS compliant and lead-free?

BC547_J22Z is manufactured in compliance with RoHS Directive 2011/65/EU and is lead-free. ON Semiconductor confirms halogen-free and green material status for TO-92 packaged transistors in this family, including BC547_J22Z, with full compliance documentation available via their quality portal.

BC547_J22Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

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

Voltage - Collector Emitter Breakdown (Max):: 45 V

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

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 110 @ 2mA, 5V

Power - Max:: 500 mW

Frequency - Transition:: 300MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

BC547_J22Z FAQ

1.How can I place an order for BC547_J22Z through Aetrix?

Please submit a Request for Quotation (RFQ) for BC547_J22Z 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 BC547_J22Z reliable?

The price and inventory of BC547_J22Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC547_J22Z is usually 5 days.

3.What payment methods are accepted for BC547_J22Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC547_J22Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC547_J22Z?

BC547_J22Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC547_J22Z 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 BC547_J22Z?

For technical support, including BC547_J22Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC547_J22Z requirements.

6.How does Aetrix verify that BC547_J22Z is sourced from the original manufacturer or authorized distributors?

All BC547_J22Z 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 BC547_J22Z meets industry standards.

7.What is the process for return or replacement of BC547_J22Z?

All BC547_J22Z units undergo pre-shipment inspection (PSI). If there is an issue with BC547_J22Z, 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 BC547_J22Z part is unused and in its original packaging.

Return procedure for BC547_J22Z:

1.Submit a request within 90 days.

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

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