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

NXP Semiconductors BC547B,112

Name: BC547B,112
Brand: NXP Semiconductors
SKU: BC547B,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC547B,112

Manufacturer:: NXP Semiconductors

Category:: Single Bipolar Transistors

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

Datasheet:: BC547B,112.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC547B,112 from Nexperia is an NPN general-purpose bipolar junction transistor (BJT) in SOT23 surface-mount package, rated for 45 V collector-emitter voltage and 100 mA continuous collector current, with DC current gain (h_FE) of 200–450 at V_CE = 5 V and I_C = 2 mA. It serves as a low-voltage switching or small-signal amplification device in discrete analog and digital interface circuits.

For engineers reviewing the BC547B,112 datasheet, BC547B,112 pinout, BC547B,112 application, or BC547B,112 equivalent, this page delivers verified electrical parameters, thermal limits, AEC-Q101 qualification status, SOT23 mechanical dimensions, and real-world use cases - all aligned to the official Nexperia BC847 series documentation.

Technical Context

The BC547B,112 operates as a standard NPN BJT with base-controlled current amplification. Its h_FE group B specification ensures predictable gain behavior across production lots, supporting consistent biasing in linear amplifier stages and reliable saturation in digital switch configurations.

It features a maximum collector-emitter saturation voltage of 400 mV at I_C = 100 mA and I_B = 5 mA, enabling efficient low-power switching. The device is qualified per AEC-Q101 for automotive-grade reliability and exhibits thermal resistance (R_th(j-a)) of 500 K/W when mounted on FR4 PCB with single-sided copper.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum safe voltage between collector and emitter with base open; defines upper rail limit in switching applications.
I_C	100 mA - Continuous collector current rating; sets load-driving capability in relay drivers or LED interfaces.
h_FE (2 mA)	200–450 - Group B DC current gain at 2 mA collector current; enables stable bias design for amplifiers and switches.
V_CE(sat)	200–400 mV - Collector-emitter saturation voltage at I_C = 10–100 mA; determines conduction loss and heat generation in saturated switch mode.
P_tot	250 mW - Total power dissipation at T_amb ≤ 25 °C in SOT23 package; constrains usable power envelope without heatsinking.
f_T	100 MHz - Transition frequency; supports small-signal amplification up to low-VHF range in RF front-ends or oscillator buffers.
AEC-Q101	Qualified - Meets stress-test requirements for automotive discrete semiconductors; suitable for under-hood and infotainment modules.

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package: 3-lead, 1.3 mm × 2.9 mm × 1.0 mm body, standard footprint compatible with reflow and wave soldering per Nexperia's recommended land patterns.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Current-controlled input node; requires appropriate series resistor to limit base drive and ensure saturation or linear operation.
2	Emiter	Common reference terminal in common-emitter configuration; connects to ground or low-side return path.
3	Collector	Output current terminal; handles switched load current or amplified signal output in active region.

Key Features

Feature	Design Value
NPN general-purpose BJT	Enables dual-use in both linear amplification (e.g., sensor signal conditioning) and digital switching (e.g., microcontroller GPIO buffering).
SOT23 package	Supports high-density PCB layouts and automated assembly; compatible with industry-standard pick-and-place and reflow profiles.
h_FE group B selection	Guarantees 200–450 gain range at 2 mA, reducing need for post-production gain binning in production test.
AEC-Q101 qualification	Validates robustness for automotive ambient temperature range (−65 °C to +150 °C) and lifetime reliability under thermal cycling.
Low V_CE(sat)	Delivers <400 mV saturation voltage at full 100 mA load, minimizing power loss and self-heating in battery-powered systems.

Applications

Automotive Door Module	Industrial Sensor Interface
Use Scenario: Driving window lift motor relays and LED status indicators in door control units. IC Role / Device Role / Timing Role: Discrete NPN switch controlling 12 V loads via microcontroller GPIO with current limiting and flyback protection. Use Value: Low V_CE(sat) reduces relay coil heating; AEC-Q101 qualification ensures operation over full automotive temperature range.	Use Scenario: Amplifying millivolt-level outputs from thermistors and bridge sensors before ADC sampling. IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier providing fixed-gain voltage boost with minimal noise contribution. Use Value: 100 MHz f_T and 2 dB noise figure support accurate low-frequency analog signal conditioning without bandwidth limitation.
Consumer Power Management	IoT Node Signal Conditioning
Use Scenario: Enabling/disabling 3.3 V LDO regulators or USB port power in smart home hubs. IC Role / Device Role / Timing Role: Low-side switch controlled by MCU to gate power to peripheral subsystems. Use Value: 100 mA rating and 250 mW dissipation allow direct drive of moderate-current rails without external driver ICs.	Use Scenario: Level-shifting UART signals between 1.8 V microcontrollers and 3.3 V transceivers. IC Role / Device Role / Timing Role: Digital inverter or level translator operating in saturated switch mode with fast turn-on/turn-off. Use Value: Consistent h_FE group B ensures predictable base drive requirements and timing margins across production batches.

Automotive Door Module

Industrial Sensor Interface

Use Scenario: Driving window lift motor relays and LED status indicators in door control units.

IC Role / Device Role / Timing Role: Discrete NPN switch controlling 12 V loads via microcontroller GPIO with current limiting and flyback protection.

Use Value: Low V_CE(sat) reduces relay coil heating; AEC-Q101 qualification ensures operation over full automotive temperature range.

Use Scenario: Amplifying millivolt-level outputs from thermistors and bridge sensors before ADC sampling.

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier providing fixed-gain voltage boost with minimal noise contribution.

Use Value: 100 MHz f_T and 2 dB noise figure support accurate low-frequency analog signal conditioning without bandwidth limitation.

Consumer Power Management

IoT Node Signal Conditioning

Use Scenario: Enabling/disabling 3.3 V LDO regulators or USB port power in smart home hubs.

IC Role / Device Role / Timing Role: Low-side switch controlled by MCU to gate power to peripheral subsystems.

Use Value: 100 mA rating and 250 mW dissipation allow direct drive of moderate-current rails without external driver ICs.

Use Scenario: Level-shifting UART signals between 1.8 V microcontrollers and 3.3 V transceivers.

IC Role / Device Role / Timing Role: Digital inverter or level translator operating in saturated switch mode with fast turn-on/turn-off.

Use Value: Consistent h_FE group B ensures predictable base drive requirements and timing margins across production batches.

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
BC847B,215	SOT23 package, identical h_FE group B spec, same 45 V/100 mA ratings; differs only in marking code and tape/reel packaging.	No functional difference; used interchangeably in PCB designs where reel orientation or date-code traceability differs.	Select BC847B,215 when sourcing from distributors requiring specific reel format or lot traceability per ISO 9001.
MMBT547	Same SOT23 footprint and electrical specs, but manufactured by ON Semiconductor; h_FE min/max matches BC547B,112 (200–450), though test conditions vary slightly.	Valid alternative where multi-source procurement is required; no layout change needed due to identical pinout and thermal profile.	Choose MMBT547 for supply chain diversification while maintaining functional equivalence in non-automotive industrial designs.

Compared with BC547B,112, BC847B,215 offers identical performance with packaging differentiation, while MMBT547 provides second-source assurance with matched key parameters - both avoid redesign but differ in qualification scope (AEC-Q101 applies only to BC547B,112).

Availability

BC547B,112 is available at Aetrix Electronics and suitable for automotive door modules, industrial sensor interfaces, consumer power management circuits, and IoT node signal conditioning requiring stable component supply and long-term manufacturability.

Supply support for BC547B,112 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

Nexperia is a global leader in high-volume production of discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and headquartered in Nijmegen, Netherlands.

The BC547B,112 belongs to Nexperia's BC847 series of general-purpose NPN transistors, designed for cost-sensitive, high-reliability applications in automotive, industrial, and consumer electronics where proven performance and AEC-Q101 compliance are essential.

FAQ

What is the maximum collector-emitter voltage rating for BC547B,112?

The BC547B,112 has a maximum collector-emitter voltage (V_CEO) rating of 45 V under open-base conditions. This value is defined in the Absolute Maximum Ratings table and must not be exceeded to prevent permanent device damage. Operation near this limit requires careful consideration of transient spikes and derating at elevated temperatures.

Is BC547B,112 pin-compatible with other transistors in the BC847 family?

Yes, BC547B,112 uses the SOT23 package with standardized pin 1 (base), pin 2 (emitter), pin 3 (collector) configuration shared across all BC847 variants including BC847A, BC847B, and BC847C. This allows direct substitution within the same package variant without PCB modification.

Does BC547B,112 meet automotive qualification standards?

Yes, BC547B,112 is AEC-Q101 qualified per Nexperia's official BC847 series documentation. This qualification confirms its suitability for automotive applications including engine control, body electronics, and infotainment systems, with validated performance across −65 °C to +150 °C ambient temperature range.

What is the typical DC current gain (h_FE) range for BC547B,112 at 2 mA collector current?

The BC547B,112 is specified as h_FE group B, with a guaranteed DC current gain range of 200 to 450 at V_CE = 5 V and I_C = 2 mA. This range is confirmed in Table 2 (Quick reference data) and Table 8 (Characteristics) of the Nexperia BC847 series datasheet.

Can BC547B,112 be used in linear amplifier applications?

Yes, BC547B,112 supports linear operation with a transition frequency (f_T) of 100 MHz and low noise figure (2–10 dB at 1 kHz), making it suitable for low-frequency audio preamplifiers, sensor signal conditioning, and active filter stages where gain stability and bandwidth are critical design factors.

BC547B,112 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

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

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:: 400mV @ 5mA, 100mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 2mA, 5V

Power - Max:: 500 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

BC547B,112 FAQ

1.How can I place an order for BC547B,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC547B,112 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 BC547B,112 reliable?

The price and inventory of BC547B,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC547B,112 is usually 5 days.

3.What payment methods are accepted for BC547B,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC547B,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC547B,112?

BC547B,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC547B,112 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 BC547B,112?

For technical support, including BC547B,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC547B,112 requirements.

6.How does Aetrix verify that BC547B,112 is sourced from the original manufacturer or authorized distributors?

All BC547B,112 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 BC547B,112 meets industry standards.

7.What is the process for return or replacement of BC547B,112?

All BC547B,112 units undergo pre-shipment inspection (PSI). If there is an issue with BC547B,112, 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 BC547B,112 part is unused and in its original packaging.

Return procedure for BC547B,112:

1.Submit a request within 90 days.

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

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