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

Nexperia USA Inc. BC846B/DG/B4R

Name: BC846B/DG/B4R
Brand: Nexperia USA Inc.
SKU: BC846B/DG/B4R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC846B/DG/B4R

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BC846B/DG/B4R.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC846B/DG/B4R from Nexperia is a 65 V, 100 mA NPN general-purpose transistor in SOT323 (SC-70) package, designed for low-power switching and linear amplification in space-constrained PCBs. It delivers h_FE = 200–450 at V_CE = 5 V / I_C = 2 mA, V_CE(sat) ≤ 400 mV at I_C = 100 mA / I_B = 5 mA, and f_T = 100 MHz - enabling reliable signal conditioning in sensor interfaces and logic-level translation circuits.

For engineers reviewing the BC846B/DG/B4R datasheet, BC846B/DG/B4R pinout, BC846B/DG/B4R application, or BC846B/DG/B4R equivalent, this page provides verified pin functions, thermal resistance (R_th(j-a) = 625 K/W), DC current gain group B specification, saturation voltage behavior across temperature, and validated alternatives for discrete BJT replacement in industrial control and consumer power management designs.

Technical Context

The BC846B/DG/B4R operates as a silicon NPN bipolar junction transistor with fixed emitter-base and collector-base junction structures optimized for stable DC gain and low saturation voltage in low-current analog and digital switching roles. Its base-emitter voltage is specified at 660 mV (typ.) at I_C = 2 mA and decreases ~2 mV/K with rising temperature.

It adheres to IEC 60134 absolute maximum ratings, including V_CEO = 65 V, V_CB0 = 80 V, and P_tot = 200 mW at T_amb ≤ 25 °C on FR4 PCB - defining its safe operating area for continuous and pulsed operation in non-automotive, commercial-grade applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	65 V - Maximum collector-emitter voltage before breakdown; sets upper rail limit for switch or amplifier stage.
I_C	100 mA - Continuous collector current rating; defines max load drive capability in switching applications.
h_FE	200–450 @ V_CE = 5 V, I_C = 2 mA - Gain group B tolerance; ensures predictable base drive sizing for bias networks.
V_CE(sat)	≤ 400 mV @ I_C = 100 mA, I_B = 5 mA - Low saturation voltage minimizes conduction loss in active-low switches.
f_T	100 MHz - Transition frequency enables use up to ~10 MHz small-signal amplification with stable gain.
R_th(j-a)	625 K/W - Junction-to-ambient thermal resistance on standard FR4; informs derating above 25 °C ambient.

Pinout & Package

SOT323 (SC-70) plastic surface-mount package: 1.3 mm × 1.8 mm footprint, 0.95 mm height, 3-terminal configuration with gull-wing leads. Designed for reflow soldering per IPC-J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control terminal; requires current-limited drive (I_B ≤ 5 mA typical) to saturate transistor reliably.
2	Emitter (E)	Reference node for bias network; connected to ground or low-side return path in common-emitter configurations.
3	Collector (C)	Output terminal; handles switched load current up to 100 mA; routed to V_CC or pull-up resistor in active-high logic interfaces.

Key Features

Feature	Design Value
Two gain selections	Group B (200–450 h_FE) enables tighter base-resistor tolerance in production designs vs. wide-range variants.
SOT323 package	0.95 mm profile and 1.3 × 1.8 mm footprint supports high-density routing in portable and IoT PCB layouts.
Low V_CE(sat)	≤ 400 mV at full rated current reduces power dissipation in battery-powered load switches and LED drivers.
150 °C max junction temp	Enables operation in enclosed enclosures or near heat sources without forced cooling in industrial environments.

Applications

Industrial Sensor Interface

Consumer Logic-Level Translation

Use Scenario: Amplifying microamp-level output from thermistors or photodiodes into clean 0–3.3 V signals for MCU ADC input.

IC Role / Device Role / Timing Role: Linear amplifier in common-emitter configuration with emitter degeneration resistor for stable gain.

Use Value: h_FE ≥ 200 ensures sufficient transconductance at I_C = 100 µA–1 mA; low noise figure (2–10 dB) preserves signal integrity.

Use Scenario: Converting 5 V TTL logic outputs to 3.3 V CMOS-compatible levels for microcontroller GPIO inputs.

IC Role / Device Role / Timing Role: Active-low level shifter using open-collector output with pull-up to 3.3 V rail.

Use Value: V_CE(sat) ≤ 200 mV at I_C = 10 mA guarantees <0.2 V drop, meeting 3.3 V logic '0' threshold (<0.8 V).

Portable Device Power Control

LED Indicator Driver

Use Scenario: Enabling/disabling 3.3 V subsystems (e.g., Bluetooth module, display backlight) via MCU GPIO.

IC Role / Device Role / Timing Role: Low-side switch with base driven by 3.3 V GPIO through current-limiting resistor.

Use Value: I_C = 100 mA rating supports typical subsystem loads; R_th(j-a) = 625 K/W allows >50 mA continuous drive at 50 °C ambient.

Use Scenario: Driving single-color indicator LEDs (red/green/yellow) from 5 V supply with current regulation.

IC Role / Device Role / Timing Role: Constant-current sink in emitter-follower configuration with sense resistor.

Use Value: Tight h_FE spread (200–450) enables ±5% LED current accuracy across production batches without trimming.

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	Same SOT323 package; h_FE = 200–450 (identical group B), but V_CEO = 45 V (vs. 65 V)	Limited to ≤45 V rail applications; unsuitable for 50 V industrial sensors or 48 V PoE-powered circuits	Select only if system voltage stays below 40 V and gain matching is critical
MMBT3904LT1G	Same SOT23 package (not pin-compatible); h_FE = 100–300, V_CEO = 40 V, R_th(j-a) = 405 K/W	Higher thermal performance but lower voltage and gain headroom; requires PCB layout change	Prefer when board space permits SOT23 and thermal budget is tight, not for direct replacement

Compared with BC846B/DG/B4R, BC847BW trades 20 V collector-emitter rating for identical gain range, while MMBT3904LT1G offers better thermal resistance but sacrifices voltage margin and requires footprint redesign - making BC846B/DG/B4R optimal for 65 V-capable, space-constrained, gain-stable switching.

Availability

BC846B/DG/B4R is available at Aetrix Electronics and suitable for industrial sensor interfaces, consumer logic-level translation, and portable device power control requiring stable component supply, consistent gain binning, and SOT323 footprint compatibility.

Supply support for BC846B/DG/B4R 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 and industrial-grade components.

The BC846xW series targets cost-sensitive, space-constrained applications needing robust general-purpose NPN transistors - emphasizing manufacturability, thermal stability, and consistent gain grouping for automated assembly and long-term reliability.

FAQ

Is BC846B/DG/B4R automotive qualified?

No. BC846B/DG/B4R is not AEC-Q101 qualified and lacks automotive-specific testing or qualification documentation. It is rated for commercial/industrial temperature range (−65 °C to +150 °C) but is not intended for safety-critical vehicle systems. Use only in non-automotive applications unless independently validated per ISO 26262 requirements.

What is the marking code for BC846B/DG/B4R on the device body?

The top-side marking is "1B%", where "1B" identifies the BC846BW variant (gain group B), and "%" is a placeholder for the manufacturing site code (e.g., "1BZ" for one facility). This matches Table 5 in the official Nexperia datasheet Rev. 12.

Can BC846B/DG/B4R replace BC546B in existing designs?

Only with layout verification. BC846B/DG/B4R uses SOT323 (SC-70), while BC546B uses TO-92 - differing in package size, thermal path, and lead pitch. Electrical specs align closely (V_CEO, h_FE, I_C), but thermal resistance increases from ~200 K/W (TO-92) to 625 K/W (SOT323), requiring derating above 25 °C ambient.

What is the maximum allowable peak collector current for short pulses?

The absolute maximum peak collector current is 200 mA for single pulses ≤1 ms (duty cycle ≤0.02), per Table 6 Limiting Values. Exceeding this risks permanent junction damage, even if average power remains within 200 mW limits. Pulse testing must confirm thermal recovery between events.

BC846B/DG/B4R Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BC846x

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:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BC846B/DG/B4R FAQ

1.How can I place an order for BC846B/DG/B4R through Aetrix?

Please submit a Request for Quotation (RFQ) for BC846B/DG/B4R 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/DG/B4R reliable?

The price and inventory of BC846B/DG/B4R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC846B/DG/B4R is usually 5 days.

3.What payment methods are accepted for BC846B/DG/B4R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC846B/DG/B4R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC846B/DG/B4R?

BC846B/DG/B4R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC846B/DG/B4R 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/DG/B4R?

For technical support, including BC846B/DG/B4R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC846B/DG/B4R requirements.

6.How does Aetrix verify that BC846B/DG/B4R is sourced from the original manufacturer or authorized distributors?

All BC846B/DG/B4R 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/DG/B4R meets industry standards.

7.What is the process for return or replacement of BC846B/DG/B4R?

All BC846B/DG/B4R units undergo pre-shipment inspection (PSI). If there is an issue with BC846B/DG/B4R, 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/DG/B4R part is unused and in its original packaging.

Return procedure for BC846B/DG/B4R:

1.Submit a request within 90 days.

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

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