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

Nexperia USA Inc. BC850B,215

Name: BC850B,215
Brand: Nexperia USA Inc.
SKU: BC850B,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC850B,215

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BC850B,215.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:4,977

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Product details

Overview

BC850B,215 from Nexperia is an AEC-Q101-qualified NPN general-purpose transistor in SOT23 package, rated for 45 V V_CEO, 100 mA I_C, and DC current gain (h_FE) of 240 at 10 µA I_C. It serves as a low-voltage, low-current switching and amplification device in automotive body electronics, sensor interface circuits, and LED driver stages.

For engineers reviewing the BC850B,215 datasheet, BC850B,215 pinout, BC850B,215 application, or BC850B,215 equivalent, key selection criteria include its automotive qualification, SOT23 thermal resistance (500 K/W on FR4), saturation voltage (200–600 mV at 100 mA), noise figure (≤4 dB), and complementary PNP pairing with BC860B.

Technical Context

The BC850B,215 operates as a silicon planar epitaxial NPN bipolar junction transistor optimized for linear amplification and saturated switching in ambient temperatures from –65 °C to +150 °C. Its h_FE spans 200–450 across 2 mA to 10 mA collector currents, with predictable thermal drift (V_BE decreases ~2 mV/K).

It exhibits low parasitic capacitance-C_c = 2.5 pF at 10 V V_CB and C_e = 11 pF at 500 mV V_EB-supporting stable small-signal gain up to 100 MHz f_T. The device meets IEC 60134 absolute maximum ratings and is characterized under standardized FR4 PCB mounting conditions.

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	100 mA continuous - Sustained load current capability; suitable for driving LEDs, relays, or logic-level interfaces
h_FE	240 (typ.) at 10 µA I_C - Ensures reliable biasing in high-impedance amplifier stages without excessive base drive
V_CE(sat)	200–600 mV at I_C = 100 mA, I_B = 5 mA - Low saturation loss enables efficient switching with minimal power dissipation
R_th(j-a)	500 K/W - Thermal resistance on standard FR4 PCB; determines junction temperature rise under 250 mW P_tot
f_T	100 MHz - Transition frequency confirms usable bandwidth for audio and low-speed digital signal conditioning
AEC-Q101	Qualified - Validated for automotive applications including interior lighting, HVAC controls, and body control modules

Pinout & Package

SOT23 plastic surface-mounted 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)	Current-controlled input node; requires ~0.7 V forward bias and precise I_B to achieve target I_C saturation
2	Emiter (E)	Reference terminal for bias network; connected to ground or common return path in low-side switch topologies
3	Collector (C)	Output current sink node; handles switched load current up to 100 mA with controlled V_CE(sat)

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive use per stress-test requirements; supports PPAP documentation and long-term reliability in vehicle ECUs
Low V_CE(sat)	200 mV minimum at full 100 mA load ensures <10 mW conduction loss in switching mode
Stable h_FE over temperature	h_FE remains ≥200 from –55 °C to +150 °C (Fig. 2), enabling robust bias design across environmental extremes
Low noise figure	≤4 dB at 1 kHz and 10 Hz–15.7 kHz bandwidth supports clean amplification in sensor front-ends
Complementary PNP pair	BC860B shares identical SOT23 footprint and matching gain/thermal specs for push-pull or differential stage implementation

Applications

Automotive Interior Lighting

Industrial Sensor Signal Conditioning

Use Scenario: Driving 20–30 mA white LEDs in door handle illumination and map light modules.

IC Role / Device Role / Timing Role: Low-side constant-current switch controlled by MCU GPIO with PWM dimming.

Use Value: V_CE(sat) ≤600 mV minimizes heat buildup in confined plastic housings; AEC-Q101 ensures 15-year field life.

Use Scenario: Amplifying millivolt-level outputs from thermistors and RTDs in PLC analog input modules.

IC Role / Device Role / Timing Role: Discrete preamplifier stage with emitter-follower configuration for impedance buffering.

Use Value: h_FE ≥240 at 10 µA enables high-input-impedance bias networks; low NF preserves SNR below 10 kHz.

Consumer Appliance Control Logic

Medical Diagnostic Equipment Interface

Use Scenario: Isolating microcontroller I/O from relay coils and buzzer drivers in washing machine control boards.

IC Role / Device Role / Timing Role: General-purpose saturated switch with flyback diode integration.

Use Value: 45 V V_CEO safely clamps inductive kickback; 200 mA I_CM peak rating accommodates relay turn-on surge.

Use Scenario: Level-shifting and buffering between 3.3 V patient-monitoring SoCs and 5 V legacy analog subsystems.

IC Role / Device Role / Timing Role: DC-coupled emitter follower for rail-to-rail voltage translation without inversion.

Use Value: V_BE = 660–770 mV (typ.) ensures predictable offset; SOT23 footprint allows dense layout in space-constrained PCBs.

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,215	Lower V_CEO (45 V same), but h_FE min = 200 at 2 mA (vs. 240 at 10 µA); slightly higher V_CE(sat) (300–700 mV)	Less suitable for ultra-low-bias amplification; better for higher-current switching where gain stability at µA levels is not critical	Select when cost sensitivity outweighs need for high h_FE at low I_C or tighter V_CE(sat) tolerance
MMBT3904LT1G	Same V_CEO/I_C, but h_FE range wider (100–300); no AEC-Q101 qualification; R_th(j-a) = 405 K/W (better thermal performance)	Not approved for automotive use; preferred in commercial-grade consumer products where qualification overhead is unnecessary	Choose for non-automotive designs requiring marginally better thermal behavior and lower unit cost

Compared with BC847B,215 and MMBT3904LT1G, the BC850B,215 uniquely combines AEC-Q101 compliance, high h_FE at microamp bias, and tight V_CE(sat) control-making it optimal for automotive and industrial applications demanding both reliability and precision low-current operation.

Availability

BC850B,215 is available at Aetrix Electronics and suitable for automotive interior lighting, industrial sensor signal conditioning, and consumer appliance control logic requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BC850B,215 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 components and energy-efficient solutions.

The BC850B,215 belongs to Nexperia's AEC-Q101-qualified general-purpose transistor family, engineered for robust performance in automotive body electronics, industrial controls, and space-constrained consumer systems where reliability and thermal predictability are essential.

FAQ

Is BC850B,215 suitable for automotive applications?

Yes. The BC850B,215 is fully qualified to AEC-Q101 standards for stress testing of discrete semiconductors, with validated performance across –65 °C to +150 °C ambient and proven reliability in automotive body control modules, lighting systems, and HVAC actuators.

What is the maximum continuous collector current for BC850B,215?

The maximum continuous collector current is 100 mA at T_amb ≤ 25 °C on a standard FR4 PCB. At elevated temperatures or reduced copper area, derating applies per the thermal resistance (R_th(j-a) = 500 K/W) and total power dissipation limit of 250 mW.

How does BC850B,215 compare to BC847B,215 in gain performance?

BC850B,215 specifies h_FE = 240 (typ.) at V_CE = 5 V and I_C = 10 µA, whereas BC847B,215 guarantees h_FE ≥ 200 only at I_C = 2 mA. This makes BC850B,215 more predictable in ultra-low-current bias networks such as high-impedance sensor amplifiers.

Can BC850B,215 be used as a direct replacement for BC860B?

No. BC850B,215 is an NPN transistor; BC860B is its PNP complement. They share identical SOT23 packaging and matched gain/thermal characteristics but opposite polarity. Substitution would invert circuit functionality and likely cause failure unless topology is redesigned.

BC850B,215 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:: 200 @ 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

BC850B,215 FAQ

1.How can I place an order for BC850B,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC850B,215 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 BC850B,215 reliable?

The price and inventory of BC850B,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC850B,215 is usually 5 days.

3.What payment methods are accepted for BC850B,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC850B,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC850B,215?

BC850B,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC850B,215 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 BC850B,215?

For technical support, including BC850B,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC850B,215 requirements.

6.How does Aetrix verify that BC850B,215 is sourced from the original manufacturer or authorized distributors?

All BC850B,215 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 BC850B,215 meets industry standards.

7.What is the process for return or replacement of BC850B,215?

All BC850B,215 units undergo pre-shipment inspection (PSI). If there is an issue with BC850B,215, 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 BC850B,215 part is unused and in its original packaging.

Return procedure for BC850B,215:

1.Submit a request within 90 days.

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

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