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

Nexperia USA Inc. BC847A-QR

Name: BC847A-QR
Brand: Nexperia USA Inc.
SKU: BC847A-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC847A-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BC847A-QR.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:6,130

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Product details

Overview

BC847A-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 110–220 at V_CE = 5 V, I_C = 2 mA. It serves as a low-voltage switching and small-signal amplification device in automotive body electronics, sensor interface stages, and LED driver bias circuits.

For engineers reviewing the BC847A-QR datasheet, BC847A-QR pinout, BC847A-QR application, or BC847A-QR equivalent, this page delivers verified electrical parameters, thermal behavior under FR4 PCB mounting, automotive qualification status, and real-world use context for reliable component selection in production-grade designs.

Technical Context

This transistor operates as a silicon-based NPN bipolar junction device with base-controlled current amplification. Its h_FE range (110–220) enables predictable biasing in linear amplifier configurations and robust saturation switching at I_C/I_B = 20, with V_CE(sat) ≤ 400 mV at I_C = 100 mA and I_B = 5 mA.

Designed for automotive environments, it meets AEC-Q101 stress test requirements including temperature cycling, HTRB, and ESD (HBM ≥ 2 kV). Thermal resistance R_th(j-a) is 500 K/W on standard FR4 PCB - a key constraint for power dissipation planning in compact layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum safe collector-emitter voltage before breakdown; defines upper rail limit in 12 V/24 V automotive supply interfaces.
I_C	100 mA continuous - Supports load switching up to ~1 W at 10 V, suitable for relay drivers and logic-level translators.
h_FE	110–220 @ V_CE = 5 V, I_C = 2 mA - Enables stable bias design with ±10% gain tolerance across temperature and unit variation.
V_CE(sat)	≤ 400 mV @ I_C = 100 mA, I_B = 5 mA - Ensures <100 mW conduction loss during switching, critical for thermally constrained modules.
P_tot	250 mW @ T_amb ≤ 25 °C - Limits usable power in ambient-restricted enclosures without heatsinking.
T_j(max)	150 °C - Allows operation in under-hood automotive zones where ambient reaches 105 °C with margin.
f_T	100 MHz @ V_CE = 5 V, I_C = 10 mA - Supports audio-frequency amplification and fast digital switching up to ~10 MHz.

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted 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.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Current-controlled input node; requires 5–10 mA drive for full saturation at 100 mA collector load.
2	Emitter (E)	Common reference terminal; tied to ground or low-side return path in switch configurations.
3	Collector (C)	Output current sink node; connects to load (e.g., LED anode, relay coil) referenced to positive supply.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive applications including engine control modules, lighting control units, and body ECUs.
Three h_FE grades (A/B/C)	Enables precise gain binning for consistent analog performance across production batches without circuit redesign.
Low V_BE(sat)	≤ 900 mV @ I_C = 100 mA, I_B = 5 mA - Reduces base drive power and improves efficiency in high-duty-cycle switching.
Thermal robustness	R_th(j-a) = 500 K/W on standard FR4 - Enables thermal modeling for PCB layout without copper pour extensions.
Small-outline packaging	SOT23 footprint supports high-density routing in space-constrained modules like door control units and sensor nodes.

Applications

Automotive Interior Lighting Control

Industrial Sensor Signal Conditioning

Use Scenario: Driving discrete LEDs in dashboard backlighting and ambient lighting modules with PWM dimming.

IC Role / Device Role / Timing Role: Low-side switch controlling LED current path; handles 50–100 mA loads at 12 V supply.

Use Value: V_CE(sat) ≤ 400 mV minimizes heat generation in sealed plastic housings, extending LED lifetime.

Use Scenario: Amplifying weak mV-level outputs from RTD or thermistor bridges in PLC analog input cards.

IC Role / Device Role / Timing Role: Common-emitter amplifier stage providing 10–20× voltage gain with stable h_FE binning.

Use Value: h_FE = 110–220 ensures predictable gain across -40 °C to +125 °C operating range.

Consumer Appliance Power Sequencing

Medical Device Status Indication

Use Scenario: Enabling/disabling auxiliary rails (e.g., display backlight, fan control) during startup/shutdown sequencing.

IC Role / Device Role / Timing Role: General-purpose switch triggered by microcontroller GPIO with 3.3 V logic level.

Use Value: Base-emitter voltage of 660 mV @ I_C = 10 mA ensures reliable turn-on with standard CMOS output drivers.

Use Scenario: Driving status LEDs on portable diagnostic equipment requiring low-power, long-life indicators.

IC Role / Device Role / Timing Role: Constant-current LED driver using emitter resistor feedback for intensity stability.

Use Value: Tight h_FE tolerance (±15%) maintains consistent LED brightness across production units.

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-Q	Same h_FE grade (A), but in SOT323 package (smaller footprint, higher R_th(j-a) = 625 K/W).	Preferred where board area is critical but thermal headroom allows higher junction rise.	Select when layout density outweighs thermal derating needs; verify trace width for 100 mA routing.
MMBT3904LT1G	h_FE = 100–300 (wider spread); not AEC-Q101 qualified; V_CEO = 40 V (5 V lower).	Suitable for commercial-grade consumer products but not automotive or industrial safety-critical functions.	Use only in non-automotive applications where qualification and tighter gain control are not required.

Compared with BC847A-QR, BC847BW-Q trades thermal performance for miniaturization, while MMBT3904LT1G offers broader gain range at the cost of automotive compliance and voltage margin - making BC847A-QR optimal for AEC-Q101–mandated systems needing predictable gain and 45 V headroom.

Availability

BC847A-QR is available at Aetrix Electronics and suitable for automotive lighting control, industrial sensor signal conditioning, and medical device status indication requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BC847A-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 energy-efficient solutions.

The BC847x-Q series targets automotive and industrial applications demanding AEC-Q101 reliability, consistent parametric performance, and SMT-compatible packaging for automated manufacturing.

FAQ

Is BC847A-QR pin-compatible with standard BC847A variants?

Yes - BC847A-QR uses the same SOT23 (TO-236AB) package and identical pin 1 (base), pin 2 (emitter), pin 3 (collector) assignment as non-Q (commercial) BC847A parts. Mechanical and electrical pinout alignment enables drop-in replacement where automotive qualification is added.

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current is 100 mA (single pulse, t_p ≤ 1 ms), but for continuous DC operation, I_B must be limited to ensure P_tot ≤ 250 mW and T_j ≤ 150 °C. At I_C = 100 mA and h_FE = 110, I_B ≈ 0.91 mA - well within safe limits with standard 10 kΩ base resistors from 3.3 V or 5 V logic.

Does BC847A-QR support operation at -65 °C?

Yes - the specified storage and operating ambient temperature range is -65 °C to +150 °C. Electrical characteristics including h_FE and V_CE(sat) remain functional at -65 °C, though h_FE decreases ~20% versus 25 °C values, as confirmed in Figures 2 and 6 of the datasheet.

How does the AEC-Q101 qualification impact supply chain handling?

AEC-Q101 qualification mandates lot-level traceability, extended reliability testing (HTOL, TC, UHAST), and controlled wafer fabrication - resulting in longer lead times and stricter change notification protocols. Aetrix Electronics maintains dedicated AEC-Q101 inventory buffers and provides full material declarations (RoHS, REACH, conflict minerals) with every shipment.

BC847A-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:: 110 @ 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

BC847A-QR FAQ

1.How can I place an order for BC847A-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for BC847A-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 BC847A-QR reliable?

The price and inventory of BC847A-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC847A-QR is usually 5 days.

3.What payment methods are accepted for BC847A-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC847A-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC847A-QR?

BC847A-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC847A-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 BC847A-QR?

For technical support, including BC847A-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC847A-QR requirements.

6.How does Aetrix verify that BC847A-QR is sourced from the original manufacturer or authorized distributors?

All BC847A-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 BC847A-QR meets industry standards.

7.What is the process for return or replacement of BC847A-QR?

All BC847A-QR units undergo pre-shipment inspection (PSI). If there is an issue with BC847A-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 BC847A-QR part is unused and in its original packaging.

Return procedure for BC847A-QR:

1.Submit a request within 90 days.

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

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