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

Nexperia USA Inc. BC846B-QR

Name: BC846B-QR
Brand: Nexperia USA Inc.
SKU: BC846B-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC846B-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BC846B-QR.pdf

Description:: TRANS NPN 65V 0.1A TO-236AB

Quantity:: RFQ Add To RFQ list

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Inventory:46,499

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Product details

Overview

BC846B-QR from Nexperia is an AEC-Q101-qualified NPN general-purpose transistor in SOT23 (TO-236AB) package, rated for 65 V V_CEO, 100 mA I_C, and h_FE = 200–450 at V_CE = 5 V / I_C = 2 mA; used for automotive signal switching and low-power amplification in engine control modules and body electronics.

For engineers reviewing the BC846B-QR datasheet, BC846B-QR pinout, BC846B-QR application, or BC846B-QR equivalent, this page delivers verified electrical parameters, thermal limits, automotive qualification status, SOT23 terminal mapping, and real-world use context - all aligned with Nexperia's Rev. 2 (2022) product data sheet.

Technical Context

This device operates as a silicon NPN bipolar junction transistor optimized for linear amplification and digital switching in ambient temperatures from −65 °C to +150 °C. Its DC current gain group B (200–450) enables stable biasing across automotive temperature ranges, while its 6 V V_EBO and 80 V V_CBO support robust input/output isolation in 12 V/24 V vehicle systems.

The BC846B-QR exhibits V_CE(sat) ≤ 400 mV at I_C = 100 mA / I_B = 5 mA and f_T = 100 MHz, making it suitable for medium-speed switching (e.g., LED drivers, sensor interface stages) without requiring external compensation. Its 250 mW P_tot rating assumes FR4 PCB mounting with standard SOT23 footprint.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	65 V - Maximum collector-emitter voltage before breakdown; supports 12 V/24 V automotive rail switching with margin.
I_C	100 mA continuous - Sustained collector current capability; sufficient for driving small relays, LEDs, or logic-level interfaces.
h_FE	200–450 at V_CE = 5 V, I_C = 2 mA - Tight DC current gain spread ensures predictable base drive requirements in production designs.
V_CE(sat)	≤ 400 mV at I_C = 100 mA, I_B = 5 mA - Low saturation voltage minimizes power loss and self-heating in switching applications.
P_tot	250 mW at T_amb ≤ 25 °C on FR4 - Thermal limit defines maximum dissipation without heatsinking; derates to zero at 150 °C junction.
f_T	100 MHz - Transition frequency confirms usable bandwidth up to ~10 MHz for small-signal amplification or PWM edge sharpening.
R_th(j-a)	500 K/W - Junction-to-ambient thermal resistance under free-air conditions; informs PCB copper area requirements for thermal management.

Pinout & Package

SOT23 (TO-236AB) plastic surface-mount package: 3-terminal, 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 mA typical base drive for full 100 mA collector conduction.
2	Emitter (E)	Reference terminal for bias network; connected to ground or low-side return path in common-emitter configurations.
3	Collector (C)	Output current sink node; handles switched load current up to 100 mA with ≤400 mV drop at rated I_B.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive use per stress test standard; eliminates need for additional qualification in Tier-1 ECUs.
Group B h_FE binning	200–450 gain range enables tighter bias design vs. generic transistors; reduces production calibration effort.
SOT23 footprint compatibility	Standardized 3-pin layout allows direct replacement of BC847B, MMBT3904, or PN2222A in existing layouts.
Low V_BE(sat)	≤ 900 mV at I_C = 100 mA / I_B = 5 mA - Enables reliable turn-on from 3.3 V or 5 V microcontroller GPIOs.

Applications

Engine Control Unit (ECU) Sensor Interface

Automotive LED Lighting Driver

Use Scenario: Amplifying low-level analog signals from crankshaft position or coolant temperature sensors before ADC sampling.

IC Role / Device Role / Timing Role: Small-signal NPN amplifier in common-emitter configuration with emitter degeneration resistor.

Use Value: Stable h_FE over −40 °C to +125 °C ensures consistent gain across operating range; 100 MHz f_T preserves signal integrity up to 10 kHz sensor bandwidth.

Use Scenario: Switching 20–80 mA LED strings in interior lighting or dashboard backlighting circuits.

IC Role / Device Role / Timing Role: Digital switch controlled by MCU GPIO; operated in saturation mode with fixed base resistor.

Use Value: V_CE(sat) ≤ 400 mV minimizes power loss and heat generation in confined space; AEC-Q101 qualification ensures reliability over 15-year vehicle life.

Body Control Module (BCM) Relay Driver

Infotainment System Audio Stage

Use Scenario: Driving 50–100 mA coil current for door lock, window lift, or HVAC relay actuation.

IC Role / Device Role / Timing Role: Low-side switch with flyback diode protection; base driven by 3.3 V logic via current-limiting resistor.

Use Value: 65 V V_CEO withstands inductive kickback spikes up to 60 V; 200 mA I_CM peak rating handles relay turn-on surge.

Use Scenario: Pre-amplifier stage for microphone inputs or line-level audio routing in head unit front-end.

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with bypassed emitter resistor for gain stability.

Use Value: 2–10 dB noise figure at 1 kHz supports clean audio capture; 11 pF C_e capacitance avoids high-frequency roll-off in 20 kHz bandwidth designs.

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
MMBT3904-7-F	h_FE = 100–300 (wider spread); V_CEO = 40 V; not AEC-Q101 qualified	Limited to non-automotive industrial or consumer use; insufficient voltage margin for 24 V systems	Select only for cost-sensitive non-automotive designs where 40 V rating and wider h_FE tolerance are acceptable
BC847B-QR	Same package and pinout; h_FE = 200–450 (identical bin), but V_CEO = 45 V instead of 65 V	Not suitable for high-voltage transient environments (e.g., load dump, alternator ripple)	Prefer BC846B-QR when system-level transients exceed 45 V; otherwise BC847B-QR offers identical gain performance at lower cost

Compared with MMBT3904-7-F and BC847B-QR, BC846B-QR uniquely combines 65 V V_CEO, AEC-Q101 qualification, and tight h_FE binning - making it the only choice for automotive-grade switching where both voltage margin and production consistency are mandatory.

Availability

BC846B-QR is available at Aetrix Electronics and suitable for automotive ECU sensor interfaces, LED lighting drivers, BCM relay control, and infotainment audio stages requiring stable component supply across extended temperature and lifecycle demands.

Supply support for BC846B-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.

The BC846x-Q series belongs to Nexperia's AEC-Q101-qualified general-purpose transistor portfolio, engineered specifically for robust, cost-effective signal switching and amplification in automotive electronic control units and body electronics.

FAQ

Is BC846B-QR pin-compatible with BC847B-QR?

Yes - both use identical SOT23 (TO-236AB) package with base-emitter-collector pin 1–2–3 assignment. However, BC846B-QR has higher 65 V V_CEO versus BC847B-QR's 45 V rating, so substitution requires verification of system-level voltage transients.

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current is 200 mA (single pulse, t_p ≤ 1 ms), but for DC operation, I_B must be limited to ensure I_C ≤ 100 mA and P_tot ≤ 250 mW. At V_CE = 5 V and I_C = 100 mA, typical I_B is 5 mA - sustained base current should not exceed 10 mA to avoid thermal runaway.

Does BC846B-QR require external ESD protection in automotive PCB layouts?

No - the device incorporates built-in ESD protection rated to ±4 kV HBM per JESD22-A114, sufficient for handling typical assembly and board-level ESD events in automotive manufacturing. Additional TVS diodes are unnecessary unless exposed to direct cable discharge events.

How does h_FE vary with temperature, and what impact does it have on bias stability?

h_FE increases with temperature: typical gain rises ~0.5%/°C between 25 °C and 125 °C. In fixed-bias circuits, this can cause collector current drift; emitter degeneration resistors or feedback networks are recommended to maintain stable Q-point across −40 °C to +150 °C operating range.

BC846B-QR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BC846x-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):: 65 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

BC846B-QR FAQ

1.How can I place an order for BC846B-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for BC846B-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 BC846B-QR reliable?

The price and inventory of BC846B-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC846B-QR is usually 5 days.

3.What payment methods are accepted for BC846B-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC846B-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC846B-QR?

BC846B-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC846B-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 BC846B-QR?

For technical support, including BC846B-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC846B-QR requirements.

6.How does Aetrix verify that BC846B-QR is sourced from the original manufacturer or authorized distributors?

All BC846B-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 BC846B-QR meets industry standards.

7.What is the process for return or replacement of BC846B-QR?

All BC846B-QR units undergo pre-shipment inspection (PSI). If there is an issue with BC846B-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 BC846B-QR part is unused and in its original packaging.

Return procedure for BC846B-QR:

1.Submit a request within 90 days.

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

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