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

Nexperia USA Inc. BC847B-QR

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

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Part No.:: BC847B-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BC847B-QR.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:44,466

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Product details

Overview

BC847B-QR from Nexperia is an AEC-Q101-qualified NPN general-purpose transistor 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-power switching and amplification device in automotive signal conditioning, LED driver biasing, and sensor interface stages.

For engineers reviewing the BC847B-QR datasheet, BC847B-QR pinout, BC847B-QR application, or BC847B-QR equivalent, this page delivers verified electrical parameters, thermal limits, automotive qualification status, and real-world use context - all aligned with Nexperia's Rev. 2 (24 June 2021) product data sheet.

Technical Context

This transistor operates as a silicon NPN bipolar junction device optimized for stable DC amplification and fast-switching duty in ambient temperatures from −65 °C to +150 °C. Its h_FE range (200–450) enables predictable base drive design across production lots, while its 45 V V_CEO rating supports 24 V automotive rail interfaces and 3.3/5 V logic-level control circuits.

Thermal resistance R_th(j-a) is 500 K/W on FR4 PCB with single-sided copper, and saturation performance is characterized at I_C/I_B = 20 (V_CEsat ≤ 400 mV @ I_C = 100 mA, I_B = 5 mA). Emitter-base breakdown voltage (V_(BR)EBO) is 6 V, limiting base bias headroom in high-side configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum collector-emitter voltage before breakdown; supports 24 V automotive systems with margin.
I_C	100 mA continuous - Suitable for driving small relays, LEDs, or logic-level MOSFET gates without heatsinking.
h_FE	200–450 @ V_CE = 5 V, I_C = 2 mA - Enables precise base resistor selection for consistent switching thresholds.
V_CEsat	≤ 400 mV @ I_C = 100 mA, I_B = 5 mA - Ensures low conduction loss in saturated switch applications.
P_tot	250 mW @ T_amb ≤ 25 °C - Limits usable power in compact SOT23 footprint without forced cooling.
T_j max	150 °C - Confirmed junction temperature limit for AEC-Q101 automotive qualification compliance.
R_th(j-a)	500 K/W - Thermal resistance defines maximum allowable power dissipation on standard FR4 PCB layout.

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package: 3-lead, 1.3 mm × 2.9 mm × 1.1 mm body, gull-wing leads, tin-plated terminations compatible with reflow and wave soldering per IPC-J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Current-controlled input node; requires series resistor to limit I_B and ensure saturation under worst-case h_FE.
2	Emitter (E)	Reference terminal for bias network; connected to ground or low-side return path in common-emitter configuration.
3	Collector (C)	Output node carrying switched load current; routed to V_CC or active load with flyback protection if inductive.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22-A110/A114.
Three h_FE gain bins	BC847B-Q offers mid-range 200–450 h_FE, enabling tighter base drive tolerance than broad-bin alternatives like BC847-Q (110–800).
Low V_CEsat at high I_C	400 mV max at 100 mA ensures <100 mW conduction loss, reducing thermal stress in space-constrained PCBs.
Standard SOT23 footprint	Compatible with industry-standard reflow profiles and automated placement; no custom tooling required for assembly.
150 °C T_j rating	Supports operation in engine bay or under-hood environments where ambient exceeds 105 °C.

Applications

Automotive Door Module Switching

Industrial Sensor Signal Amplification

Use Scenario: Controlling window lift motor enable lines and door lock solenoids in 12 V/24 V vehicle architectures.

IC Role / Device Role / Timing Role: Low-side switch for PWM-driven loads, interfacing microcontroller GPIO to higher-current paths.

Use Value: AEC-Q101 qualification ensures long-term reliability under vibration and thermal cycling; 45 V V_CEO accommodates load-dump transients up to ISO 7637-2 Pulse 5a.

Use Scenario: Amplifying weak analog outputs from pressure or temperature sensors before ADC sampling.

IC Role / Device Role / Timing Role: Common-emitter amplifier stage with fixed bias network, providing 20–30 dB voltage gain.

Use Value: Tight h_FE bin (200–450) reduces gain variation across units, minimizing calibration effort in production test.

LED Status Indicator Driver

Microcontroller GPIO Level Translation

Use Scenario: Driving multi-color status LEDs on dashboard or control panel PCBs with 3.3 V MCU outputs.

IC Role / Device Role / Timing Role: Saturated switch turning on 20 mA LED strings from 5 V supply rails.

Use Value: V_CEsat ≤ 400 mV minimizes forward voltage drop, preserving LED brightness and simplifying current-limiting resistor calculation.

Use Scenario: Converting 3.3 V logic signals to 5 V or 12 V levels for legacy peripherals or optocoupler inputs.

IC Role / Device Role / Timing Role: Inverting level shifter with pull-up resistor on collector, supporting >1 MHz toggle rates.

Use Value: f_T ≥ 100 MHz ensures clean edge response; low C_c (1.5 pF) prevents signal degradation in high-speed digital interfaces.

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,115 (Nexperia)	Non-automotive grade; same h_FE bin but lacks AEC-Q101 qualification and extended temperature validation.	Not suitable for automotive safety-critical modules; acceptable for consumer or industrial prototypes.	Select only when AEC-Q101 compliance is not required and cost sensitivity outweighs qualification assurance.
MMBT3904LT1G (onsemi)	40 V V_CEO, 200 mA I_C, h_FE 100–300; slightly lower voltage rating but higher current capability.	Better suited for 5 V logic systems with higher load currents; less margin for 24 V automotive transients.	Prefer when operating below 40 V and requiring >100 mA drive; verify V_CEO margin against system surge requirements.

Compared with BC847B-QR, BC847B,115 omits automotive qualification and thermal validation, while MMBT3904LT1G trades 5 V V_CEO margin for 100 mA extra collector current - making BC847B-QR optimal for AEC-compliant 24 V switching where voltage robustness and gain consistency are prioritized.

Availability

BC847B-QR is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, LED driver circuits, and microcontroller peripheral buffering requiring stable component supply across production lifecycles.

Supply support for BC847B-QR 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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.

The BC847x-Q series targets automotive signal switching and amplification, delivering AEC-Q101-compliant performance in miniature SOT23 packages for space- and reliability-constrained ECUs and sensor nodes.

FAQ

Is BC847B-QR pin-compatible with BC847B,115?

Yes - both use identical SOT23 (TO-236AB) package with base-emitter-collector pinout (1-2-3). Mechanical and electrical pin functions match exactly, allowing direct PCB substitution where qualification requirements permit.

What is the maximum safe operating current for BC847B-QR at 85 °C ambient?

At T_amb = 85 °C, derated power dissipation is ~125 mW (using linear derating from 250 mW at 25 °C), limiting continuous I_C to approximately 60 mA with V_CE ≈ 2 V to stay within thermal limits and avoid junction overheating.

Does BC847B-QR support pulsed operation beyond 100 mA?

Yes - peak collector current I_CM is rated at 200 mA for single pulses ≤ 1 ms. This enables short-duration surge handling in relay coil snubbing or capacitive load charging, provided duty cycle remains low to avoid thermal accumulation.

How does the 1F% marking code identify BC847B-QR on the device?

The top-side marking "1F%" (where % is a site-specific code) uniquely identifies BC847B-QR per Nexperia's ordering table; "1F" distinguishes it from BC847A-Q (1E%) and BC847C-Q (1G%), confirming the 200–450 h_FE bin and Q-series automotive qualification.

BC847B-QR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BC847x-Q

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:: 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:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BC847B-QR FAQ

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

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

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

3.What payment methods are accepted for BC847B-QR?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC847B-QR?

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

Once your BC847B-QR 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-QR?

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

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

All BC847B-QR 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-QR meets industry standards.

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

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

Return procedure for BC847B-QR:

1.Submit a request within 90 days.

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

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