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

Diodes Incorporated BC846B-7-F

Name: BC846B-7-F
Brand: Diodes Incorporated
SKU: BC846B-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC846B-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

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

Datasheet:: BC846B-7-F.pdf

Description:: TRANS NPN 65V 0.1A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC846B-7-F from Diodes Incorporated is an NPN small-signal transistor in SOT23 package, rated for 80 V collector-base voltage, 65 V collector-emitter voltage, and 100 mA continuous collector current, with DC current gain (h_FE) of 200–450 at 2 mA/5 V; used in low-power switching and audio-frequency amplification stages in consumer and industrial control circuits.

For engineers reviewing the BC846B-7-F datasheet, BC846B-7-F pinout, BC846B-7-F application, or BC846B-7-F equivalent, key selection criteria include V_CEO/V_CBO ratings, h_FE spread at operating bias, V_CE(sat) at 10 mA/0.5 mA drive, thermal resistance (R_θJA = 403 °C/W), and RoHS/Green compliance status.

Technical Context

This device operates as a general-purpose bipolar junction transistor with fixed NPN polarity, optimized for linear amplification and saturated switching in low-voltage, low-current signal paths. Its h_FE binning (B-grade) guarantees minimum 200 and typical 290 gain at 2 mA/5 V, supporting stable biasing in discrete amplifier topologies.

Thermal performance is defined for standard SOT23 mounting on 1 oz copper FR4: R_θJA = 403 °C/W (minimum pad layout) and 357 °C/W (15 mm × 15 mm copper), enabling predictable derating above 25 °C ambient. ESD robustness includes 4 kV HBM and 400 V MM ratings per JEDEC standards.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CBO	80 V - maximum reverse-biased collector-base voltage before breakdown; sets upper limit for voltage swing in common-emitter switch configurations
V_CEO	65 V - maximum collector-emitter sustaining voltage under open-base condition; defines safe off-state blocking capability
I_C (continuous)	100 mA - maximum steady DC collector current; determines usable load drive capacity in active or saturation regions
h_FE @ 2 mA/5 V	200–450 - guaranteed DC current gain range for B-grade; enables predictable base drive calculation in amplifier and switch designs
V_CE(sat) @ 10 mA/0.5 mA	90–250 mV - collector-emitter saturation voltage at moderate drive; directly impacts power loss and logic-level compatibility
f_T	100–300 MHz - transition frequency; confirms suitability for audio-band amplification and low-MHz digital switching
R_θJA	403 °C/W - junction-to-ambient thermal resistance on minimal PCB pad; informs temperature rise under 310 mW max dissipation

Pinout & Package

Package: SOT23 - surface-mount plastic package with 3-pin configuration, 0.008 g mass, UL 94V-0 flammability rating, and matte tin-plated leads solderable per MIL-STD-202.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Reference node for base-emitter junction; connects to ground or low-impedance return path in common-emitter topology
2 (Base)	Control input	Receives forward bias current to modulate collector current; requires series resistor to limit I_B and ensure saturation or linear operation
3 (Collector)	Current source terminal	Delivers amplified or switched output current; connects to load and supply rail in standard configurations

Key Features

Feature	Design Value
NPN small-signal transistor	Enables discrete amplification and switching in space-constrained PCB layouts where integrated solutions are impractical
h_FE binning (B-grade)	Guarantees 200–450 gain at 2 mA/5 V, reducing design margin uncertainty versus un-binned transistors
SOT23 package with lead-free finish	Supports automated placement and reflow soldering while meeting RoHS 3 and halogen-free ("Green") compliance requirements
4 kV HBM ESD rating	Provides handling robustness during assembly and field operation without requiring external protection in low-risk environments

Applications

Audio Pre-amplifier Stage

Microcontroller GPIO Driver

Use Scenario: Amplifying weak microphone or sensor signals prior to ADC sampling in portable audio devices.

IC Role / Device Role / Timing Role: Discrete NPN transistor configured in common-emitter topology to provide voltage gain with low noise (NF = 2–10 dB).

Use Value: Delivers stable 200–450 h_FE at 2 mA bias, enabling precise gain setting and minimizing distortion in 20 Hz–20 kHz band.

Use Scenario: Driving LED indicators or small relays from microcontroller I/O pins with limited current sourcing capability.

IC Role / Device Role / Timing Role: Low-side switch with base driven by 3.3 V or 5 V GPIO; operates in saturation mode for minimal V_CE(sat).

Use Value: Achieves ≤250 mV V_CE(sat) at 10 mA/0.5 mA drive, ensuring efficient on-state power delivery and logic-level compatibility.

Power Supply Enable Circuit

Industrial Sensor Interface

Use Scenario: Enabling/disabling auxiliary rails (e.g., 3.3 V or 5 V) in multi-rail power systems using MCU-controlled enable signals.

IC Role / Device Role / Timing Role: High-side or low-side pass transistor controlled via base resistor network; handles up to 100 mA load current.

Use Value: Rated for 65 V V_CEO and 100 mA I_C, supporting reliable rail switching across wide input voltage ranges with low thermal rise.

Use Scenario: Level-shifting and buffering analog sensor outputs (e.g., thermistor, RTD, or Hall-effect) into ADC inputs in factory automation modules.

IC Role / Device Role / Timing Role: Emitter-follower buffer providing high input impedance and low output impedance for signal integrity preservation.

Use Value: Input impedance (h_ie) of 4.5 kΩ at 2 mA supports minimal loading of high-Z sensor sources without gain error.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN small-signal transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC847B-7-F	Lower V_CEO (45 V vs. 65 V) and same h_FE range; identical SOT23 package and pinout	Not suitable for 60 V rail switching; acceptable for ≤45 V signal paths and audio stages	Select when system voltage is capped at 45 V and higher gain consistency is required across temperature
MMBT3904LT1G	Higher V_CEO (40 V), wider h_FE range (100–300), and lower R_θJA (417 °C/W); same SOT23 footprint	Marginally lower voltage rating limits use in 65 V applications; better thermal performance on dense boards	Prefer for cost-sensitive designs where 40 V blocking suffices and tighter thermal management is needed

Compared with BC846B-7-F, BC847B-7-F trades 20 V V_CEO headroom for identical gain and package, while MMBT3904LT1G offers broader availability and slightly better thermal metrics but lacks 65 V capability-making BC846B-7-F optimal for legacy 60 V+ switching and precision AF amplification.

Availability

BC846B-7-F is available at Aetrix Electronics and suitable for audio pre-amplifiers, microcontroller GPIO drivers, and industrial sensor interfaces requiring stable component supply, consistent h_FE binning, and RoHS-compliant packaging.

Supply support for BC846B-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, industry-standard components for power management, signal integrity, and protection.

The BC846x series belongs to Diodes' broad portfolio of general-purpose bipolar transistors designed for cost-effective, high-volume switching and amplification in consumer, industrial, and automotive electronics.

FAQ

What is the maximum allowable collector-emitter voltage for BC846B-7-F?

The absolute maximum collector-emitter voltage (V_CEO) is 65 V at T_A = +25°C. This rating applies under open-base conditions and must be derated linearly above 25°C ambient per the datasheet's thermal curve. Exceeding this voltage risks avalanche breakdown and permanent device failure.

Is BC846B-7-F compatible with lead-free reflow soldering processes?

Yes. BC846B-7-F features matte tin-plated leads and is fully RoHS 3 compliant (2015/863/EU), with no intentionally added lead, halogens, or antimony. It meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for standard Pb-free reflow profiles up to 260°C peak temperature.

How does the h_FE binning of BC846B compare to BC846A and BC846C?

BC846B specifies h_FE = 200–450 at I_C = 2 mA and V_CE = 5 V; BC846A is 110–220, and BC846C is 420–800. The B-bin provides mid-range gain stability ideal for designs requiring predictable base drive without overdesigning for worst-case h_FE spread.

Can BC846B-7-F replace BC847B-7-F in existing designs?

Yes, with voltage margin verification. Both share identical SOT23 pinout and h_FE binning, but BC846B-7-F supports 65 V V_CEO versus 45 V for BC847B-7-F. Substitution is safe if the application's maximum V_CE remains ≤45 V; otherwise, BC846B-7-F offers superior voltage headroom.

BC846B-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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:: 600mV @ 5mA, 100mA

Current - Collector Cutoff (Max):: 15nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 2mA, 5V

Power - Max:: 300 mW

Frequency - Transition:: 300MHz

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BC846B-7-F FAQ

1.How can I place an order for BC846B-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BC846B-7-F 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-7-F reliable?

The price and inventory of BC846B-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC846B-7-F is usually 5 days.

3.What payment methods are accepted for BC846B-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC846B-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC846B-7-F?

BC846B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC846B-7-F 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-7-F?

For technical support, including BC846B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC846B-7-F requirements.

6.How does Aetrix verify that BC846B-7-F is sourced from the original manufacturer or authorized distributors?

All BC846B-7-F 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-7-F meets industry standards.

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

All BC846B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BC846B-7-F, 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-7-F part is unused and in its original packaging.

Return procedure for BC846B-7-F:

1.Submit a request within 90 days.

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

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