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

Nexperia USA Inc. BC847A/SNR

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

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Part No.:: BC847A/SNR

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BC847A/SNR.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC847A/SNR from Nexperia is an 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 consumer power management, LED driver biasing, and microcontroller interface circuits.

For engineers reviewing the BC847A/SNR datasheet, BC847A/SNR pinout, BC847A/SNR application, or BC847A/SNR equivalent, key selection criteria include verified h_FE binning (A-grade), SOT23 thermal resistance (500 K/W), V_CE(sat) ≤ 200 mV at I_C = 100 mA / I_B = 5 mA, and JEDEC-compliant marking code "1E%".

Technical Context

The BC847A operates as a silicon planar epitaxial NPN transistor with open-base collector-emitter breakdown voltage of 45 V and emitter-base breakdown voltage of 6 V. Its h_FE range (110–220) is tightly binned per A-grade specification, enabling predictable base drive design in linear and saturated switching modes.

Thermal performance is defined for FR4 PCB mounting: R_th(j-a) = 500 K/W, with maximum junction temperature of 150 °C and ambient operating range from –65 °C to +150 °C. Saturation behavior is characterized at I_C/I_B = 20, supporting reliable low-V_CE(sat) operation in digital logic interfacing.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum safe collector-emitter voltage under open-base condition; defines upper rail limit in 3.3 V/5 V logic-level switch designs.
I_C	100 mA - Continuous DC collector current rating; supports driving small relays, LEDs, or MOSFET gates without forced cooling.
h_FE	110–220 - A-grade DC current gain at V_CE = 5 V, I_C = 2 mA; enables stable bias network design with ±10% base current margin.
V_CE(sat)	≤200 mV - Measured at I_C = 100 mA, I_B = 5 mA; ensures <10 mW conduction loss in saturated switching applications.
P_tot	250 mW - Total power dissipation at T_amb ≤ 25 °C on standard FR4 PCB; sets thermal derating threshold for ambient temperatures above 25 °C.
V_BE(sat)	≤900 mV - Base-emitter saturation voltage at I_C = 100 mA, I_B = 5 mA; determines minimum GPIO or logic output voltage required for full turn-on.

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; 1.3 mm × 2.9 mm footprint, 1.1 mm height, and tin-plated terminations compatible with reflow and wave soldering per IPC-J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control terminal for forward-biased junction; requires current-limited drive (e.g., 1–10 kΩ series resistor from MCU GPIO).
2	Emitter (E)	Reference node for current flow; typically tied to ground in low-side switch configurations.
3	Collector (C)	Output current path; connects to load (e.g., LED anode or relay coil) when used in common-emitter topology.

Key Features

Feature	Design Value
Three h_FE bins (A/B/C)	A-grade (110–220) enables consistent base resistor selection across production batches without recalibration.
SOT23 package compatibility	Standardized footprint aligns with JEDEC TO-236AB; allows drop-in replacement in existing SMT layouts without redesign.
Low V_CE(sat)	200 mV max at full 100 mA load reduces power loss and self-heating in battery-powered sensor nodes.
Wide operating temperature	–65 °C to +150 °C junction range supports industrial control modules exposed to thermal cycling or under-hood environments.
FR4 PCB thermal spec	R_th(j-a) = 500 K/W defined for single-sided copper; provides baseline for thermal simulation in cost-sensitive consumer PCBs.

Applications

LED Current Control

Microcontroller GPIO Interface

Use Scenario: Driving 20 mA indicator LEDs from 3.3 V supply in portable instrumentation.

IC Role / Device Role / Timing Role: Low-side switch controlling LED cathode connection to ground.

Use Value: V_CE(sat) ≤ 200 mV ensures >95% efficiency in LED forward voltage utilization; h_FE binning guarantees consistent brightness across units.

Use Scenario: Level-shifting 1.8 V MCU outputs to drive 5 V logic inputs or optocouplers.

IC Role / Device Role / Timing Role: Digital buffer amplifier translating logic states with minimal propagation delay.

Use Value: Fast transition frequency (f_T ≥ 100 MHz) and low C_c (≤1.5 pF) preserve signal integrity up to 10 MHz switching rates.

Relay Coil Driver

Small-Signal Amplifier Stage

Use Scenario: Switching 5 V/30 mA relay coils in HVAC control panels.

IC Role / Device Role / Timing Role: Saturated switch providing galvanic isolation between MCU and inductive load.

Use Value: I_CM = 200 mA peak rating handles relay turn-on surge; built-in flyback diode not required due to robust V_CEO margin.

Use Scenario: Pre-amplifying microphone signals in voice-activated IoT edge devices.

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with fixed bias network.

Use Value: NF = 2–10 dB at 1 kHz enables SNR > 60 dB in audio front-ends; h_FE stability over temperature minimizes gain drift.

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/SNR	Same h_FE bin (110–220), but in SOT323 package (smaller footprint, higher R_th(j-a) = 625 K/W).	Preferred where board space is constrained but thermal budget allows higher junction rise.	Select BC847BW/SNR only if layout revision permits smaller pad geometry and thermal modeling confirms safe operation.
MMBT3904LT1G	h_FE = 100–300 (wider spread), V_CEO = 40 V, V_CE(sat) = 300 mV @ I_C = 10 mA.	Higher gain variability impacts bias stability; lower V_CEO limits use in 45 V systems.	Choose MMBT3904LT1G only when legacy design reuse mandates identical pinout and no V_CEO margin is needed.

Compared with BC847A/SNR, BC847BW/SNR trades thermal performance for miniaturization, while MMBT3904LT1G offers broader h_FE tolerance at the cost of reduced voltage headroom and higher saturation loss-making BC847A/SNR optimal for cost-sensitive, thermally stable 45 V switching where gain consistency is critical.

Availability

BC847A/SNR is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller interface stages, relay coil drivers, and small-signal amplifiers requiring stable component supply across high-volume consumer and industrial production runs.

Supply support for BC847A/SNR 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 essential semiconductors, delivering high-performance, reliable components for automotive, industrial, mobile, and consumer markets.

The BC847x series targets cost-sensitive, high-reliability general-purpose analog functions-designed specifically for discrete switching and amplification in space-constrained SMT applications where predictable h_FE and robust thermal specs are mandatory.

FAQ

What is the marking code for BC847A/SNR?

The top-side marking for BC847A/SNR is "1E%", where "%" is a placeholder for the manufacturing site code. This matches Nexperia's official marking table and distinguishes it from BC847B ("1F%") and BC847C ("1G%"). The marking is laser-etched on the SOT23 package and visible under 10× magnification.

Does BC847A/SNR support automotive applications?

No-BC847A/SNR is explicitly designated as non-automotive qualified per Nexperia's revision history (v.13, July 2022). It lacks AEC-Q101 qualification, automotive-grade testing, and extended reliability screening. For automotive use, Nexperia recommends the BC847AQ series, which undergoes full AEC-Q101 stress testing and has separate part numbering.

What is the maximum safe continuous collector current at 85 °C ambient?

At T_amb = 85 °C, the maximum continuous collector current is derated to approximately 65 mA. This is calculated using P_tot = 250 mW, R_th(j-a) = 500 K/W, and T_j(max) = 150 °C: allowable power = (150 − 85) / 500 = 130 mW; then I_C ≈ √(P / R_CE(sat)) ≈ 65 mA assuming typical V_CE(sat) ~ 150 mV.

Can BC847A/SNR replace BC547 in existing designs?

Yes-BC847A/SNR is a direct SOT23 drop-in replacement for through-hole BC547 in new designs, offering identical electrical specs (V_CEO, h_FE, I_C) and improved thermal performance via surface-mount packaging. However, mechanical adaptation is required: SOT23 footprint differs from TO-92, and soldering process must shift from through-hole to reflow.

BC847A/SNR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BC847A/SNR FAQ

1.How can I place an order for BC847A/SNR through Aetrix?

Please submit a Request for Quotation (RFQ) for BC847A/SNR 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/SNR reliable?

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

3.What payment methods are accepted for BC847A/SNR?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC847A/SNR?

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

Once your BC847A/SNR 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/SNR?

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

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

All BC847A/SNR 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/SNR meets industry standards.

7.What is the process for return or replacement of BC847A/SNR?

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

Return procedure for BC847A/SNR:

1.Submit a request within 90 days.

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

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