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

Nexperia USA Inc. BC847A,235

Name: BC847A,235
Brand: Nexperia USA Inc.
SKU: BC847A,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC847A,235

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BC847A,235.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC847A,235 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 and I_C = 2 mA. It serves as a low-voltage switching or small-signal amplification device in discrete bias networks, level-shifting stages, and LED driver current control circuits.

For engineers reviewing the BC847A,235 datasheet, BC847A,235 pinout, BC847A,235 application, or BC847A,235 equivalent, this part is selected for cost-sensitive, space-constrained designs requiring predictable h_FE spread, stable V_CE(sat) below 400 mV at I_C = 100 mA, and compatibility with standard SMT reflow profiles.

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 binning (110–220) targets mid-gain applications where moderate current drive and thermal stability across −55 °C to 150 °C are required.

Thermal resistance R_th(j-a) is 500 K/W on FR4 PCB with single-sided copper, and saturation performance is characterized at I_C/I_B = 20, supporting reliable switching in 3.3 V/5 V logic interface circuits without external gain compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum safe collector-emitter voltage with base open; defines upper rail limit in low-side switch or amplifier stage.
I_C	100 mA - Continuous DC collector current rating; supports LED drivers, relay coils, and signal buffering up to ~100 mW dissipation.
h_FE	110–220 @ V_CE = 5 V, I_C = 2 mA - Tighter gain band than BC847 (110–800), enabling more predictable base resistor sizing in linear and switching designs.
V_CE(sat)	200–400 mV @ I_C = 100 mA, I_B = 5 mA - Low saturation voltage reduces power loss and heat generation in saturated-switch operation.
P_tot	250 mW @ T_amb ≤ 25 °C - Power dissipation limit on standard FR4 PCB; derates linearly above 25 °C ambient.
f_T	100 MHz @ V_CE = 5 V, I_C = 10 mA - Transition frequency supports audio-frequency amplification and fast digital switching up to ~10 MHz.

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; 1.3 mm × 2.9 mm footprint, 1.1 mm height, and gull-wing lead form compatible with standard 0.95 mm pitch reflow soldering.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control terminal; requires current-limited drive (e.g., via series resistor) to bias transistor into active or saturation region.
2	Emiter (E)	Reference node for current flow; connected to ground or low-side return path in common-emitter configurations.
3	Collector (C)	Output/load terminal; sinks current from V_CC-side load (e.g., LED anode, relay coil top) when switched on.

Key Features

Feature	Design Value
Three gain bins (A/B/C)	Enables precise h_FE selection: BC847A (110–220) balances gain consistency and cost for general-purpose use.
Low V_CE(sat)	200–400 mV at full 100 mA load ensures <100 mW conduction loss in switching mode, reducing thermal stress on PCB.
JEDEC-standard SOT23	Ensures mechanical and thermal interoperability with existing pick-and-place equipment, stencil designs, and reflow profiles.
−65 °C to +150 °C operating range	Supports deployment in industrial control, automotive under-hood non-safety modules, and outdoor electronics without derating.

Applications

LED Current Control

Microcontroller GPIO Interface

Use Scenario: Driving 20 mA indicator LEDs from 3.3 V or 5 V MCU outputs.

IC Role / Device Role / Timing Role: NPN low-side switch controlled by MCU GPIO pin.

Use Value: V_CE(sat) ≤ 400 mV ensures >95% LED forward voltage utilization; h_FE ≥ 110 allows base current ≤ 200 µA, minimizing GPIO loading.

Use Scenario: Level-shifting or current boosting between 1.8 V/3.3 V logic domains.

IC Role / Device Role / Timing Role: Discrete buffer stage isolating sensitive logic from capacitive or resistive loads.

Use Value: f_T = 100 MHz supports clean edge transitions up to 10 MHz; low C_c (1.5 pF) minimizes signal distortion.

Relay Driver Circuit

Audio Pre-amplifier Stage

Use Scenario: Switching 12 V/50 mA electromechanical relays using 3.3 V microcontroller outputs.

IC Role / Device Role / Timing Role: Saturated switch providing galvanic isolation between logic and relay coil.

Use Value: I_C = 100 mA rating exceeds typical relay hold current; V_CEO = 45 V withstands flyback spikes up to 40 V with clamp diode.

Use Scenario: Single-stage small-signal amplification in microphone preamp or sensor signal conditioning.

IC Role / Device Role / Timing Role: Common-emitter amplifier with emitter degeneration for linearity.

Use Value: h_FE = 180 typ. enables stable 20–50× voltage gain at audio frequencies; NF = 2–10 dB supports SNR-critical front ends.

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
BC847B,235	h_FE = 200–450 (higher gain, wider spread)	Better suited for high-gain amplification or low-base-drive switching; less predictable at low I_C	Select when higher current gain is needed and tighter h_FE tolerance is not critical.
MMBT3904LT1G	h_FE = 100–300; V_CEO = 40 V; P_tot = 310 mW; same SOT23 package	Slightly lower voltage rating but higher power handling; different gain distribution and thermal profile	Choose for legacy design continuity or where 40 V rating suffices and marginally higher dissipation is beneficial.

Compared with BC847B,235 and MMBT3904LT1G, BC847A,235 offers the narrowest h_FE range in the BC847x family-ideal for designs requiring consistent base resistor values across production batches without gain binning or trimming.

Availability

BC847A,235 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller interface buffers, relay control modules, and audio preamplifiers requiring stable component supply, JEDEC-compliant packaging, and traceable manufacturing origin.

Supply support for BC847A,235 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 BC847x series targets cost-sensitive, high-yield consumer and industrial applications where proven SOT23 reliability, tight parametric binning, and seamless drop-in replacement capability are essential.

FAQ

What is the maximum junction temperature for BC847A,235?

The absolute maximum junction temperature (T_j) is 150 °C, per IEC 60134 limiting values. Operation at this temperature requires strict thermal management: R_th(j-a) = 500 K/W on standard FR4 means ambient must stay ≤ 87.5 °C at full 250 mW dissipation to avoid exceeding T_j.

Is BC847A,235 suitable for automotive applications?

No-BC847A,235 is not automotive-qualified. The datasheet explicitly states non-automotive qualification (Rev. 13, Section 13). For automotive use, Nexperia offers Q-qualified variants (e.g., BC847AQ series) with AEC-Q101 testing, extended temperature validation, and PPAP documentation.

How does BC847A,235 differ from BC847,235 in practical design?

BC847A has guaranteed h_FE = 110–220 at I_C = 2 mA, while BC847 spans 110–800. This narrower range simplifies base resistor calculation and improves batch-to-batch consistency in switching applications, avoiding overdesign or marginal turn-on in production.

Can BC847A,235 replace BC547 in existing designs?

Yes-with caveats. Both are NPN transistors in TO-92, but BC847A,235 is SOT23 surface-mount with different thermal and electrical characteristics: lower P_tot (250 mW vs. 500 mW), smaller package, and tighter h_FE. PCB layout and thermal relief must be updated; electrical behavior is otherwise functionally equivalent at I_C ≤ 100 mA.

BC847A,235 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:: Active

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,235 FAQ

1.How can I place an order for BC847A,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC847A,235 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,235 reliable?

The price and inventory of BC847A,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC847A,235 is usually 5 days.

3.What payment methods are accepted for BC847A,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC847A,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC847A,235?

BC847A,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC847A,235 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,235?

For technical support, including BC847A,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC847A,235 requirements.

6.How does Aetrix verify that BC847A,235 is sourced from the original manufacturer or authorized distributors?

All BC847A,235 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,235 meets industry standards.

7.What is the process for return or replacement of BC847A,235?

All BC847A,235 units undergo pre-shipment inspection (PSI). If there is an issue with BC847A,235, 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,235 part is unused and in its original packaging.

Return procedure for BC847A,235:

1.Submit a request within 90 days.

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

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