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

Diodes Incorporated BC847B-7-F

Name: BC847B-7-F
Brand: Diodes Incorporated
SKU: BC847B-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC847B-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BC847B-7-F.pdf

Description:: TRANS NPN 45V 0.1A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC847B-7-F from Diodes Incorporated is an NPN small-signal transistor in SOT23 package, rated for 45 V V_CEO, 100 mA I_C, and 310 mW P_D, with DC current gain (h_FE) of 200–450 at I_C = 2 mA, used in low-power switching and audio-frequency amplification circuits.

For engineers reviewing the BC847B-7-F datasheet, BC847B-7-F pinout, BC847B-7-F application, or BC847B-7-F equivalent, this page delivers verified electrical parameters, thermal derating behavior, SOT23 terminal mapping, and direct alternatives for discrete BJT selection in space-constrained consumer and industrial PCBs.

Technical Context

This transistor operates as a general-purpose NPN bipolar junction device optimized for automatic insertion and high-volume surface-mount assembly. Its 45 V collector-emitter breakdown voltage and 200–450 DC current gain range support stable biasing in linear amplifier stages and clean saturation in digital logic interface switching.

The SOT23 package enables thermal resistance of 403 °C/W (junction-to-ambient on minimal pad layout), and its 3 pF C_obo and 100–300 MHz f_T support operation up to mid-VHF frequencies in RF front-end preamps and oscillator buffer stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum safe collector-emitter voltage before avalanche conduction in common-emitter configuration.
I_C	100 mA - Continuous collector current limit defining maximum linear output drive capability.
h_FE	200–450 - DC current gain range at I_C = 2 mA, V_CE = 5 V, enabling predictable base drive sizing.
V_CE(sat)	90–250 mV - Saturation voltage at I_C = 10 mA / I_B = 0.5 mA, critical for low-loss switching efficiency.
f_T	100–300 MHz - Transition frequency indicating usable bandwidth for small-signal amplification.
P_D	310 mW - Maximum power dissipation on standard FR4 with 1 oz copper, setting thermal design margin.
C_obo	3 pF - Output capacitance at V_CB = 10 V, influencing high-frequency gain roll-off and stability.

Pinout & Package

SOT23 plastic surface-mount package with matte tin-plated leads, UL 94V-0 flammability rating, moisture sensitivity level 1, and approximate weight of 0.008 g.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	E	Current sink node; connects to ground or low-impedance return path in common-emitter amplifier or switch.
2 (Base)	B	Control input; requires ~0.66 V forward bias and precise current limiting for reliable turn-on/turn-off.
3 (Collector)	C	Current source node; interfaces with load (e.g., relay coil, LED, next-stage input) in active or saturated mode.

Key Features

Feature	Design Value
Lead-free & RoHS 3 compliant	Fully compliant with EU Directive 2015/863/EU; no intentionally added lead, bromine & chlorine <900 ppm each.
SOT23 mechanical compatibility	Standardized footprint matching JEDEC TO-236AB; supports automated pick-and-place and reflow soldering.
High h_FE consistency	Guaranteed 200–450 h_FE range at I_C = 2 mA ensures tight gain matching across production lots.
Low V_CE(sat)	Typical 90 mV at I_C = 10 mA / I_B = 0.5 mA reduces conduction loss in switching applications.

Applications

LED Driver Circuit

Microcontroller GPIO Interface

Use Scenario: Driving 20 mA indicator LEDs from 3.3 V or 5 V logic rails using microcontroller outputs.

IC Role / Device Role / Timing Role: NPN switch configured in common-emitter topology, sinking LED current to ground.

Use Value: Low 90 mV V_CE(sat) minimizes voltage drop and heat generation, preserving LED forward voltage margin.

Use Scenario: Level-shifting and current amplification between low-drive MCU pins and higher-current external peripherals.

IC Role / Device Role / Timing Role: Signal buffer and current booster, isolating MCU I/O from capacitive or resistive loads.

Use Value: 200–450 h_FE allows use of high-value base resistors (e.g., 10 kΩ), reducing MCU pin loading and power consumption.

Audio Pre-amplifier Stage

Power Supply Enable Switch

Use Scenario: Low-noise voltage amplification of microphone or sensor signals in portable audio devices.

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with emitter degeneration for linearity and gain stability.

Use Value: 2 dB typical noise figure at 1 kHz and 200 µA I_C supports high signal-to-noise ratio in battery-powered systems.

Use Scenario: Enabling/disabling auxiliary power rails (e.g., 12 V fan supply) via MCU-controlled ON/OFF command.

IC Role / Device Role / Timing Role: High-side or low-side enable switch controlling PMOS/NMOS gate drive or relay coil activation.

Use Value: 45 V V_CEO headroom accommodates transient spikes in 12 V automotive or industrial supply environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN small-signal transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT3904LT1G	V_CEO = 40 V, h_FE = 100–300, V_CE(sat) = 200 mV @ I_C/I_B = 10/1 mA	Lower gain range and higher saturation voltage reduce efficiency in low-voltage switching.	Select when cost sensitivity outweighs gain and saturation performance requirements.
PN2222A-AP	V_CEO = 40 V, h_FE = 100–300, P_D = 625 mW in TO-92, not SOT23	Larger through-hole package prevents use in dense SMT layouts; higher power rating irrelevant for same I_C.	Choose only for legacy through-hole designs or where thermal mass justifies TO-92 over SOT23.

Compared with MMBT3904LT1G and PN2222A-AP, BC847B-7-F offers superior h_FE consistency and lower V_CE(sat) in the same SOT23 footprint, making it preferable for compact, low-power switching and amplification where gain stability and efficiency are prioritized.

Availability

BC847B-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO interfacing, and audio pre-amplifier stages requiring stable component supply and consistent parametric performance across production batches.

Supply support for BC847B-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The BC846–BC848 series belongs to Diodes' general-purpose small-signal transistor product line, engineered for high-reliability, automated SMT assembly in consumer, industrial, and automotive electronics.

FAQ

What is the maximum operating temperature for BC847B-7-F?

The BC847B-7-F has an operating junction temperature range of –65 °C to +150 °C, with thermal resistance R_θJA = 403 °C/W on minimum recommended pad layout. Derating begins above +25 °C ambient, reaching zero power at +150 °C junction temperature per the published derating curve.

Is BC847B-7-F suitable for automotive applications?

The standard BC847B-7-F is not qualified to AEC-Q101. Diodes offers the automotive-grade BC847BQ-7-F variant, which undergoes additional stress testing and is documented in a separate datasheet (DS11108Q). Use BC847BQ-7-F for automotive under-hood or infotainment systems.

How does the marking "K1R" relate to BC847B-7-F?

"K1R" is the top-side laser marking code for BC847B-7-F on the SOT23 package, per Diodes' standard marking scheme. "K1" identifies the device type and gain group, while "R" denotes the BC847B variant within the BC846–BC848 family, confirmed in the official ordering information table.

Can BC847B-7-F replace BC847A-7-F in existing designs?

Yes - BC847B-7-F can directly replace BC847A-7-F, as both share identical absolute maximum ratings, package, and pinout. The only difference is h_FE: BC847A specifies 110–220, while BC847B guarantees 200–450. This higher gain improves base drive margin without altering circuit functionality or layout.

BC847B-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

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

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

Power - Max:: 300 mW

Frequency - Transition:: 300MHz

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BC847B-7-F FAQ

1.How can I place an order for BC847B-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BC847B-7-F 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 BC847B-7-F reliable?

The price and inventory of BC847B-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC847B-7-F is usually 5 days.

3.What payment methods are accepted for BC847B-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC847B-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC847B-7-F?

BC847B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC847B-7-F 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 BC847B-7-F?

For technical support, including BC847B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC847B-7-F requirements.

6.How does Aetrix verify that BC847B-7-F is sourced from the original manufacturer or authorized distributors?

All BC847B-7-F 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 BC847B-7-F meets industry standards.

7.What is the process for return or replacement of BC847B-7-F?

All BC847B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BC847B-7-F, 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 BC847B-7-F part is unused and in its original packaging.

Return procedure for BC847B-7-F:

1.Submit a request within 90 days.

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

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