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

Nexperia USA Inc. BC847B/SNR

Name: BC847B/SNR
Brand: Nexperia USA Inc.
SKU: BC847B/SNR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC847B/SNR

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BC847B/SNR.pdf

Description:: TRANS NPN 45V 0.1A TO-236AB

Quantity:: RFQ Add To RFQ list

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Inventory:5,869

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Product details

Overview

BC847B/SNR from Nexperia is an NPN general-purpose bipolar junction transistor (BJT) in SOT23 (TO-236AB) package, rated for 45 V V_CEO, 100 mA I_C, and 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 compact consumer and industrial PCBs.

For engineers reviewing the BC847B/SNR datasheet, BC847B/SNR pinout, BC847B/SNR application, or BC847B/SNR equivalent, this page delivers verified pin functions, thermal limits, saturation voltage behavior, gain binning context, and real-world use cases - all aligned with Nexperia's Rev. 13 product data sheet.

Technical Context

The BC847B/SNR operates as a discrete NPN BJT with fixed gain binning (200–450), optimized for linear amplification and saturated switching in low-power analog and digital interface circuits. Its base-emitter and collector-emitter junctions are characterized across −55 °C to +150 °C, with V_BE(sat) = 900 mV typical at I_C = 100 mA / I_B = 5 mA.

Thermal resistance R_th(j-a) is 500 K/W on FR4 PCB with single-sided copper, limiting continuous power dissipation to 250 mW at T_amb ≤ 25 °C. Absolute maximum ratings include V_CBO = 50 V, V_EBO = 6 V, and peak pulse currents up to 200 mA (t_p ≤ 1 ms).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum safe collector-emitter voltage under open-base condition; defines upper rail limit in switching designs.
I_C	100 mA - Continuous DC collector current rating; sets load drive capability in relay drivers or LED switches.
h_FE	200–450 - Gain binning range at V_CE = 5 V, I_C = 2 mA; enables predictable biasing in amplifier stages.
V_CE(sat)	200–400 mV - Collector-emitter saturation voltage at I_C = 100 mA / I_B = 5 mA; determines conduction loss in switch mode.
P_tot	250 mW - Total power dissipation on standard FR4 PCB; constrains thermal design margin in high-duty-cycle operation.
f_T	100 MHz - Transition frequency at V_CE = 5 V, I_C = 10 mA; supports audio-frequency amplification and fast digital switching.

Pinout & Package

SOT23 (TO-236AB) surface-mount plastic package: 3-pin, 1.3 mm × 2.9 mm footprint, 0.95 mm height, tin-plated leads compatible with reflow and wave soldering per IPC-J-STD-020/001.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Current-controlled input node; requires ~5 mA base drive for full saturation at 100 mA collector load.
2	Emitter (E)	Common reference terminal; connected to ground or low-side return path in common-emitter configurations.
3	Collector (C)	Output current sink node; handles switched loads up to 45 V and 100 mA with <400 mV dropout.

Key Features

Feature	Design Value
Three h_FE bins	BC847B offers 200–450 gain spread - simplifies bias network design without trimming resistors in production.
Low V_CE(sat)	200–400 mV at I_C/I_B = 20 - reduces power loss and heat generation in battery-powered switch applications.
High f_T	100 MHz - supports stable small-signal amplification up to mid-audio band without external compensation.
Robust thermal rating	T_j max = 150 °C - enables reliable operation in enclosed industrial enclosures with limited airflow.

Applications

LED Driver Circuit

Microcontroller GPIO Expander

Use Scenario: Driving 20 mA indicator LEDs from 3.3 V MCU outputs with current-limiting resistor.

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

Use Value: V_CE(sat) ≤ 400 mV ensures >2.9 V forward voltage remains across LED, maintaining brightness consistency.

Use Scenario: Extending digital output count of an 8-bit microcontroller using discrete transistor arrays.

IC Role / Device Role / Timing Role: Low-gain, high-reliability switch translating logic-high to active-low load enable signals.

Use Value: Tight h_FE bin (200–450) guarantees consistent turn-on behavior across batches without recalibration.

Audio Pre-amplifier Stage

Power Supply Enable Control

Use Scenario: Single-transistor common-emitter amplifier boosting microphone signal before ADC input.

IC Role / Device Role / Timing Role: Small-signal linear amplifier biased at I_C = 2 mA, V_CE = 5 V.

Use Value: f_T = 100 MHz and NF = 2–10 dB support clean amplification up to 20 kHz with minimal added noise.

Use Scenario: Enabling/disabling a 5 V LDO regulator via MCU GPIO in a multi-rail power system.

IC Role / Device Role / Timing Role: High-side or low-side enable switch controlling EN pin or ground return path.

Use Value: V_CEO = 45 V provides 9× safety margin over 5 V rail, preventing latch-up during transient overvoltage events.

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
BC847BW/SNR	Same electrical specs but in SOT323 package (smaller footprint, higher thermal resistance).	Used where board space is constrained but thermal derating is acceptable.	Select when layout density outweighs thermal performance needs.
MMBT3904LT1G	h_FE = 100–300 (lower max gain); V_CEO = 40 V; slightly higher V_CE(sat) (300–600 mV).	Common in legacy automotive-qualified designs; wider availability in North American distribution.	Choose for cross-supply compatibility or where lower gain tolerance is acceptable.

Compared with BC847B/SNR, BC847BW/SNR trades thermal margin for size reduction, while MMBT3904LT1G offers broader global stock but narrower gain range and reduced voltage headroom - making BC847B/SNR optimal for new designs prioritizing gain stability and 45 V robustness.

Availability

BC847B/SNR is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller interface expansion, audio pre-amplifiers, and power supply enable control requiring stable component supply and consistent h_FE binning.

Supply support for BC847B/SNR 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 semiconductor expert focused on essential efficiency-enhancing components, delivering high-volume, high-reliability discrete and logic devices.

The BC847x series targets cost-sensitive, space-constrained applications needing dependable general-purpose switching and amplification - emphasizing manufacturability, thermal predictability, and binning consistency across consumer, industrial, and computing platforms.

FAQ

What is the marking code for BC847B/SNR?

The marking code for BC847B/SNR is "1F%", where "%" is a placeholder for the manufacturing site code. This laser-marked identifier appears on the top surface of the SOT23 package and aligns with Nexperia's standardized coding per Table 5 of the Rev. 13 datasheet.

Can BC847B/SNR replace BC847C in a circuit?

No - BC847B (h_FE = 200–450) and BC847C (h_FE = 420–800) have non-overlapping gain bins. Substituting B for C may cause insufficient drive in high-gain-dependent circuits like low-base-current amplifiers, risking distortion or cutoff.

Is BC847B/SNR qualified for automotive use?

No - BC847B/SNR is not automotive-qualified. Per Nexperia's Rev. 13 datasheet revision history, the BC847x_SER series was explicitly changed to non-automotive qualification in July 2022. Automotive alternatives (e.g., BC847B-Q) must be selected separately.

What is the maximum allowable PCB trace width for SOT23 thermal relief?

Nexperia specifies a standard SOT23 footprint on FR4 with single-sided copper and tin plating. Thermal relief is not defined by trace width alone; instead, the datasheet mandates a 500 K/W junction-to-ambient resistance under those conditions - achieved using the recommended land pattern (Fig. 15), not arbitrary trace dimensions.

BC847B/SNR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

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:: 250 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BC847B/SNR FAQ

1.How can I place an order for BC847B/SNR through Aetrix?

Please submit a Request for Quotation (RFQ) for BC847B/SNR 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/SNR reliable?

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

3.What payment methods are accepted for BC847B/SNR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC847B/SNR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC847B/SNR?

BC847B/SNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC847B/SNR 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/SNR?

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

6.How does Aetrix verify that BC847B/SNR is sourced from the original manufacturer or authorized distributors?

All BC847B/SNR 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/SNR meets industry standards.

7.What is the process for return or replacement of BC847B/SNR?

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

Return procedure for BC847B/SNR:

1.Submit a request within 90 days.

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

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