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

Diodes Incorporated BC846A-7-F

Name: BC846A-7-F
Brand: Diodes Incorporated
SKU: BC846A-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC846A-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

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

Datasheet:: BC846A-7-F.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:113,566

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Product details

Overview

BC846A-7-F from Diodes Incorporated is an NPN small-signal transistor in SOT23 package, rated for 80 V collector-base voltage (V_CBO), 65 V collector-emitter voltage (V_CEO), and 100 mA continuous collector current (I_C). It delivers DC current gain (h_FE) of 110–220 at I_C = 2 mA, V_CE = 5 V, and is optimized for switching and audio-frequency amplifier applications in space-constrained PCBs.

For engineers reviewing the BC846A-7-F datasheet, BC846A-7-F pinout, BC846A-7-F application, or BC846A-7-F equivalent, key selection criteria include V_CEO/V_CBO ratings, h_FE binning (A-grade), SOT23 thermal resistance (R_θJA = 403 °C/W), and RoHS-compliant lead-free construction with matte tin plating.

Technical Context

This NPN bipolar junction transistor operates in linear amplification and saturated switching modes, with verified V_BE(on) = 580–700 mV at I_C = 2 mA and V_CE = 5 V, and V_CE(sat) ≤ 250 mV at I_C = 10 mA / I_B = 0.5 mA. Its f_T = 100–300 MHz supports high-frequency AF and low-speed digital signal conditioning.

Thermal performance is defined for 1 oz copper FR4 layouts: R_θJA = 403 °C/W (minimum pad) and 357 °C/W (15 mm × 15 mm pad), with safe operating area limited by V_CEO = 65 V and P_D = 310 mW. ESD robustness includes 4 kV HBM and 400 V MM ratings per JEDEC JESD22-A114/A115.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CBO	80 V - Maximum reverse bias before breakdown between collector and base; defines high-side switch headroom
V_CEO	65 V - Maximum collector-emitter voltage under open-base condition; sets rail-to-rail switching limit
I_C (continuous)	100 mA - Max steady-state collector current; determines load drive capability in relay drivers or LED switches
h_FE @ 2 mA	110–220 - DC current gain range for A-grade bin; enables predictable base drive sizing in amplifier stages
V_CE(sat) @ 10 mA	≤ 250 mV - Low saturation voltage ensures <2.5 mW power loss in switching mode at 10 mA load
f_T	100–300 MHz - Gain-bandwidth product confirms suitability for audio preamps and RF detector front-ends up to ~100 MHz
P_D	310 mW - Power dissipation on standard FR4; requires thermal relief for >150 mW sustained operation

Pinout & Package

Package: SOT23 - Surface-mount plastic package (2.90 mm × 1.30 mm × 1.03 mm), UL 94V-0 rated, moisture sensitivity level 1, 0.008 g weight, matte tin-plated leads solderable per MIL-STD-202 Method 208.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Reference node for biasing; connects to ground or low-impedance return path in common-emitter configurations
2 (Base)	Control input	Receives current-limited drive (typically 0.05–5 mA); requires series resistor to limit I_B and prevent saturation overshoot
3 (Collector)	Current source terminal	Drives load toward V_CC; must remain ≤65 V under all operating conditions including inductive kickback

Key Features

Feature	Design Value
Automated insertion compatibility	SOT23 footprint and marking (K1Q) support pick-and-place accuracy and AOI verification
Lead-free & RoHS 3 compliant	No intentionally added lead, Br/Cl <1500 ppm total, Sb <1000 ppm - meets EU automotive and industrial compliance mandates
Complementary PNP pairing	Direct match with BC856A–BC858C series for push-pull output stages and differential amplifiers
High-temperature operation	Rated for T_J = –65°C to +150°C - supports under-hood and industrial control environments
Low-noise amplification	NF = 2–10 dB @ 1 kHz, 200 µA - suitable for microphone preamp and sensor signal conditioning

Applications

Audio Preamp Stage

General-Purpose Switch

Use Scenario: Amplifying low-level analog signals from electret microphones or piezoelectric sensors in portable audio devices.

IC Role / Device Role / Timing Role: NPN common-emitter amplifier with fixed bias network, providing 20–40 dB voltage gain at 1–20 kHz.

Use Value: h_FE = 110–220 and NF = 2–10 dB enable clean gain without introducing audible noise or distortion.

Use Scenario: Driving indicator LEDs, relays, or small solenoids from MCU GPIO pins in industrial HMIs and power supplies.

IC Role / Device Role / Timing Role: Saturated switch with base resistor limiting I_B to ensure I_C/I_B ≥ 20 for reliable turn-on.

Use Value: V_CE(sat) ≤ 250 mV at I_C = 10 mA minimizes power loss and self-heating during continuous duty cycles.

Level Translation Interface

Current Mirror Reference

Use Scenario: Translating logic levels between 3.3 V microcontrollers and 5 V or 12 V peripheral buses in embedded systems.

IC Role / Device Role / Timing Role: Common-emitter inverter with pull-up resistor, providing inverted, shifted output compatible with TTL or CMOS inputs.

Use Value: V_CEO = 65 V and fast f_T allow reliable operation across 3.3 V–12 V domains with sub-100 ns propagation delay.

Use Scenario: Establishing matched bias currents in analog ICs, op-amp input stages, or precision reference circuits.

IC Role / Device Role / Timing Role: One leg of a discrete two-transistor current mirror, leveraging matched h_FE and thermal tracking in same-package layout.

Use Value: Tight h_FE bin (A-grade) and identical SOT23 thermal mass improve current ratio accuracy to ±5% over temperature.

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
BC846B-7-F	Higher h_FE bin (200–450 vs. 110–220); identical V_CEO, V_CBO, and package	Preferred where higher gain reduces base drive burden, e.g., low-power sensor interfaces	Select BC846B if circuit requires lower I_B or improved β-stability at low I_C
MMBT3904LT1G	Same SOT23 package but lower V_CEO (40 V), higher I_C (200 mA), and wider h_FE spread (100–300)	Used in higher-current switching (e.g., fan control) where 65 V rating is unnecessary	Choose MMBT3904LT1G only when V_CEO < 45 V suffices and higher I_C margin is needed

Compared with BC846B-7-F and MMBT3904LT1G, BC846A-7-F provides the tightest h_FE tolerance for predictable bias design, maintains the highest V_CEO in its family, and offers superior thermal stability for precision analog use cases.

Availability

BC846A-7-F is available at Aetrix Electronics and suitable for audio preamplification, general-purpose switching, level translation interfaces, and current mirror references requiring stable component supply across industrial, consumer, and automotive-qualified designs.

Supply support for BC846A-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, headquartered in Plano, Texas, with design centers and manufacturing facilities across Asia and the Americas.

The BC846A–BC848C series belongs to Diodes' small-signal transistor product line, engineered for cost-sensitive, high-volume applications demanding consistent gain binning, robust ESD protection, and full RoHS/"Green" compliance in SOT23 packaging.

FAQ

What is the maximum allowable collector-emitter voltage for BC846A-7-F?

The absolute maximum collector-emitter voltage (V_CEO) for BC846A-7-F is 65 V at T_A = +25°C. This rating decreases with rising junction temperature and must not be exceeded under any operating condition, including transient events like inductive flyback. Derating follows the published thermal curve: power dissipation drops linearly above +25°C ambient.

Does BC846A-7-F have automotive qualification?

No - BC846A-7-F is not AEC-Q101 qualified. Diodes offers the automotive-compliant variant BC846AQ–BC848CQ under a separate datasheet (DS11108Q), which includes extended temperature testing (–40°C to +150°C), enhanced reliability screening, and PPAP documentation support for automotive Tier 1 suppliers.

How is the "A" suffix in BC846A-7-F defined?

The "A" suffix denotes the h_FE gain bin: BC846A guarantees DC current gain of 110–220 at I_C = 2 mA and V_CE = 5 V. This is distinct from BC846B (200–450) and BC846C (420–800), enabling precise bias network design without gain variation-induced drift in analog circuits.

Can BC846A-7-F replace BC847A-7-F in existing designs?

Yes, with verification - both share identical SOT23 package, pinout, and marking (K1Q), but BC847A has lower V_CEO (45 V) and V_CBO (50 V). Replacement is safe only if the application's maximum V_CE remains ≤45 V; otherwise, BC846A-7-F's higher 65 V rating provides additional margin against overvoltage transients.

BC846A-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:: 110 @ 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

BC846A-7-F FAQ

1.How can I place an order for BC846A-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BC846A-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 BC846A-7-F reliable?

The price and inventory of BC846A-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 BC846A-7-F is usually 5 days.

3.What payment methods are accepted for BC846A-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC846A-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC846A-7-F?

BC846A-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC846A-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 BC846A-7-F?

For technical support, including BC846A-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC846A-7-F requirements.

6.How does Aetrix verify that BC846A-7-F is sourced from the original manufacturer or authorized distributors?

All BC846A-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 BC846A-7-F meets industry standards.

7.What is the process for return or replacement of BC846A-7-F?

All BC846A-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BC846A-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 BC846A-7-F part is unused and in its original packaging.

Return procedure for BC846A-7-F:

1.Submit a request within 90 days.

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

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