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

Nexperia USA Inc. BC850C,235

Name: BC850C,235
Brand: Nexperia USA Inc.
SKU: BC850C,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC850C,235

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BC850C,235.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC850C,235 from Nexperia is an NPN general-purpose bipolar junction transistor in SOT23 package, rated for 45 V V_CEO, 100 mA I_C, and DC current gain (h_FE) of 420–800 at 2–10 mA collector current. It serves as a low-voltage switching and small-signal amplification device in consumer power management, LED drivers, and logic-level interface circuits.

For engineers reviewing the BC850C,235 datasheet, BC850C,235 pinout, BC850C,235 application, or BC850C,235 equivalent, key selection criteria include verified h_FE spread across operating currents, thermal resistance (R_th(j-a) = 500 K/W on FR4), saturation voltage performance at I_C/I_B = 20, and SOT23 footprint compatibility with automated assembly.

Technical Context

This discrete NPN transistor operates in linear and saturated modes, with base-emitter turn-on voltage (V_BE) ranging 580–770 mV at 2–10 mA I_C, and exhibits predictable h_FE degradation above 100 °C - dropping to ~50% of room-temperature value at T_j = 150 °C. Its f_T of 100 MHz supports audio-frequency amplification and fast-switching digital interfaces.

Thermal behavior follows standard JEDEC FR4 PCB assumptions: R_th(j-a) is 500 K/W under single-sided copper, tin-plated conditions. Noise figure remains ≤4 dB at 1 kHz and 10 Hz–15.7 kHz bandwidths, confirming suitability for low-noise preamplifier stages where signal integrity matters.

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 designs.
I_C (continuous)	100 mA - Continuous collector current rating; sets load-driving capacity for LEDs, relays, and small solenoids.
h_FE	420–800 @ I_C = 2–10 mA - Confirmed DC current gain range ensures reliable base drive sizing without overdesign.
V_CE(sat)	200–600 mV @ I_C = 100 mA, I_B = 5 mA - Low saturation voltage minimizes conduction loss in switching applications.
f_T	100 MHz - Transition frequency enables stable operation up to mid-audio frequencies without phase inversion risk.
R_th(j-a)	500 K/W - Thermal resistance on standard FR4 PCB; informs derating curves for ambient temperatures >70 °C.

Pinout & Package

SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, 3-terminal configuration with gull-wing leads.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control terminal; requires current-limited drive (max I_B = 200 mA peak) to avoid thermal runaway.
2	Emiter (E)	Reference node for biasing; connected to ground or common return path in low-side switch configurations.
3	Collector (C)	Load connection point; handles switched current up to 100 mA with <200 mV drop when properly saturated.

Key Features

Feature	Design Value
Low-voltage switching capability	Rated for 45 V V_CEO and 50 V V_CBO; suitable for 3.3 V/5 V logic-controlled loads without level-shifting.
Stable h_FE across temperature	h_FE retains ≥450 at T_j = 150 °C (Fig. 2), enabling consistent gain in thermally constrained enclosures.
Predictable saturation behavior	V_CE(sat) ≤ 600 mV at full-rated I_C, supporting efficient power delivery in battery-powered sensor nodes.
Low noise performance	4 dB noise figure at 1 kHz confirms usability in analog front-end stages preceding ADC inputs.

Applications

LED Driver Circuit

Microcontroller GPIO Expander

Use Scenario: Driving 20 mA indicator LEDs from 3.3 V MCU outputs with current-limiting resistor.

IC Role / Device Role / Timing Role: NPN switch providing inverted logic-level control and current gain to reduce GPIO loading.

Use Value: Enables direct drive without external driver ICs; V_CE(sat) < 300 mV ensures >95% LED forward voltage utilization.

Use Scenario: Level-shifting and current boosting for legacy 5 V peripherals interfaced to modern 3.3 V microcontrollers.

IC Role / Device Role / Timing Role: Discrete level translator with gain, replacing dedicated buffer ICs in cost-sensitive designs.

Use Value: Eliminates need for dual-supply translators; h_FE > 420 ensures full saturation with ≤10 µA base current.

Audio Pre-amplifier Stage

Power Supply Enable Switch

Use Scenario: First-stage amplification of electret microphone output before filtering and ADC sampling.

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

Use Value: 4 dB NF and 100 MHz f_T preserve SNR and bandwidth up to 20 kHz without distortion.

Use Scenario: Enabling/disabling 12 V auxiliary rails in industrial controllers using 3.3 V logic signals.

IC Role / Device Role / Timing Role: Low-side enable switch controlling PMOS gate drive or relay coil ground path.

Use Value: 100 mA rating supports typical enable loads; 500 K/W R_th(j-a) allows continuous operation at 75 °C ambient.

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
BC849C	V_CEO = 30 V (vs. 45 V); h_FE min = 420 same, but tighter 420–630 range; lower f_T (80 MHz).	Not suitable for 40 V rail switching; acceptable only where supply voltage ≤24 V and bandwidth <100 kHz required.	Select BC849C only if board space allows identical SOT23 footprint and system voltage margin is ≥2× nominal rail.
MMBT3904LT1G	V_CEO = 40 V (5 V lower); h_FE min = 100 (much wider spread); R_th(j-a) = 400 K/W (better thermal dissipation).	Higher gain variability increases base resistor tolerance sensitivity; preferred where thermal headroom is critical over gain consistency.	Choose MMBT3904LT1G when thermal design dominates and gain calibration is handled digitally or via feedback.

Compared with BC850C,235, BC849C trades voltage headroom for tighter h_FE control, while MMBT3904LT1G offers better thermal performance at the cost of gain predictability - making BC850C optimal for voltage-critical, gain-stable 3.3/5 V switching.

Availability

BC850C,235 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, audio pre-amplifier stages, and power supply enable switches requiring stable component supply and SOT23 footprint consistency.

Supply support for BC850C,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 essential semiconductors for automotive, industrial, mobile, and computing markets.

The BC850C belongs to Nexperia's general-purpose bipolar transistor product line, engineered for cost-effective, robust switching and amplification in space-constrained consumer and industrial electronics.

FAQ

Is BC850C,235 automotive-qualified?

No. Per Nexperia's revision history (v.4, October 2024), BC850C is explicitly designated non-automotive qualified. It lacks AEC-Q101 stress testing and automotive-grade screening. For automotive use, Nexperia recommends the BC850C-Q series - which carries separate part numbers and qualification documentation.

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current (I_BM) is 200 mA, but continuous operation must respect the total power dissipation limit of 250 mW at T_amb ≤ 25 °C. At I_C = 100 mA and h_FE = 420, required I_B ≈ 238 µA - well within safe limits. Derating applies above 25 °C ambient per R_th(j-a) = 500 K/W.

Can BC850C,235 replace BC850B in existing designs?

Yes, with verification. BC850C has higher minimum h_FE (420 vs. 200 for BC850B) and identical voltage/current ratings. Circuits relying on guaranteed minimum gain ≥420 will function identically; those designed for BC850B's lower h_FE may exhibit faster switching but require checking V_CE(sat) and thermal margins at full load.

Does BC850C,235 have a built-in ESD protection diode?

No. The datasheet does not specify any integrated ESD protection structure. External protection (e.g., series resistor + TVS at base input) is recommended for handling environments exceeding ±2 kV HBM, especially in handheld or connector-exposed applications.

BC850C,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:: 600mV @ 5mA, 100mA

Current - Collector Cutoff (Max):: 15nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 420 @ 2mA, 5V

Power - Max:: 250 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BC850C,235 FAQ

1.How can I place an order for BC850C,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC850C,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 BC850C,235 reliable?

The price and inventory of BC850C,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC850C,235 is usually 5 days.

3.What payment methods are accepted for BC850C,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC850C,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC850C,235?

BC850C,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC850C,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 BC850C,235?

For technical support, including BC850C,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC850C,235 requirements.

6.How does Aetrix verify that BC850C,235 is sourced from the original manufacturer or authorized distributors?

All BC850C,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 BC850C,235 meets industry standards.

7.What is the process for return or replacement of BC850C,235?

All BC850C,235 units undergo pre-shipment inspection (PSI). If there is an issue with BC850C,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 BC850C,235 part is unused and in its original packaging.

Return procedure for BC850C,235:

1.Submit a request within 90 days.

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

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