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

Nexperia USA Inc. BC849B,215

Name: BC849B,215
Brand: Nexperia USA Inc.
SKU: BC849B,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC849B,215

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BC849B,215.pdf

Description:: TRANS NPN 30V 0.1A TO-236AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC849B,215 from Nexperia is an AEC-Q101-qualified NPN general-purpose transistor in SOT23 package, rated for 30 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 stages, and LED driver bias circuits.

For engineers reviewing the BC849B,215 datasheet, BC849B,215 pinout, BC849B,215 application, or BC849B,215 equivalent, this page delivers verified electrical parameters, thermal resistance (500 K/W), saturation voltage (200–600 mV at I_C = 100 mA), noise figure (4 dB), and automotive qualification status - all critical for reliability-critical signal conditioning and discrete logic-level translation.

Technical Context

This NPN bipolar junction transistor operates in active, saturation, and cutoff regions with defined V_BE (660 mV typ. at I_C = 2 mA) and V_CEsat (200–600 mV at I_C/I_B = 20). Its f_T of 100 MHz supports high-frequency small-signal amplification up to audio band edges.

Thermal performance is characterized by R_th(j-a) = 500 K/W on FR4 PCB with single-sided copper, and junction temperature is rated to 150 °C - enabling use in under-hood automotive modules where ambient temperatures exceed 105 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	30 V - Maximum collector-emitter voltage before breakdown; defines safe operating range in 12 V/24 V automotive supply rails.
I_C max	100 mA - Continuous collector current limit; suitable for driving LEDs, relays, and small-signal MOSFET gates.
h_FE	240 (typ. at V_CE = 5 V, I_C = 10 µA) - Ensures stable base drive design with margin for temperature variation and process spread.
V_CEsat	200–600 mV (at I_C = 100 mA, I_B = 5 mA) - Low saturation voltage minimizes power loss and self-heating in switching applications.
f_T	100 MHz - Enables use in RF preamplifiers, oscillator buffers, and fast digital signal conditioning up to ~10 MHz square-wave edge rates.
NF	4 dB (at I_C = 200 µA, f = 1 kHz) - Confirmed low-noise performance for analog sensor front-ends and microphone biasing.
R_th(j-a)	500 K/W - Thermal resistance measured on standard FR4 PCB; informs heatsinking requirements for sustained 100 mA operation.

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control terminal; requires ~0.66 V forward bias and ~5 mA base current to saturate at 100 mA collector load.
2	Emitter (E)	Current return path; internally connected to substrate; must be tied to lowest potential in common-emitter configuration.
3	Collector (C)	Output current terminal; handles full load current and dissipates majority of power during switching transitions.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive applications including engine control modules, lighting control units, and body control modules per stress test requirements.
Low V_CEsat at high I_C	600 mV max at 100 mA ensures <100 mW conduction loss, reducing thermal stress in space-constrained PCB layouts.
Stable h_FE over temperature	h_FE remains ≥200 from –55 °C to +150 °C (Fig. 2), supporting robust bias network design across automotive thermal ranges.
Low noise figure	4 dB NF enables use in analog front-ends for Hall-effect sensors and thermistor signal conditioning without added op-amp stages.
Standard SOT23 footprint	Compatible with industry-standard reflow and wave soldering footprints (Fig. 7 & 8); supports automated assembly and IPC-7351 compliance.

Applications

Automotive Interior Lighting Control

Industrial Sensor Signal Conditioning

Use Scenario: Driving 20 mA white LEDs in door handle illumination modules with PWM dimming.

IC Role / Device Role / Timing Role: Discrete NPN switch replacing integrated drivers to reduce BOM cost and improve thermal isolation.

Use Value: V_CEsat ≤ 600 mV limits power dissipation to <12 mW per LED channel, eliminating need for thermal vias in thin FR4 panels.

Use Scenario: Amplifying low-level output (1–10 mV) from RTD-based temperature sensors in PLC analog input cards.

IC Role / Device Role / Timing Role: First-stage common-emitter amplifier with fixed bias network and emitter degeneration resistor.

Use Value: 4 dB noise figure and h_FE stability over –40 °C to +85 °C ensure <0.1% measurement drift across industrial operating range.

Consumer Appliance Power Sequencing

Medical Diagnostic Equipment Biasing

Use Scenario: Enabling 5 V logic rails only after 12 V main supply stabilizes in smart oven control boards.

IC Role / Device Role / Timing Role: Level-shifting enable switch between isolated power domains using resistor-divider base bias.

Use Value: 30 V V_CEO provides 2× margin over 12 V rail transients, preventing latch-up during brown-out recovery.

Use Scenario: Providing precise 100 µA bias current to photodiode arrays in portable pulse oximeters.

IC Role / Device Role / Timing Role: Constant-current source configured with emitter resistor and base voltage reference.

Use Value: Tight h_FE distribution (200–450) and low I_CBO (<15 nA at 25 °C) minimize current drift and dark-current error in low-light detection.

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 h_FE (110–220), same V_CEO/I_C ratings, identical SOT23 package and pinout.	Less gain margin for high-impedance base drive; unsuitable for low-base-current microcontroller GPIO direct drive.	Select when cost sensitivity outweighs gain stability needs and base drive capability is assured via external buffer.
MMBT3904LT1G	Higher V_CEO (40 V), higher f_T (300 MHz), but non-AEC-Q101 qualified and wider h_FE spread (100–300).	Not approved for automotive under-hood use; better suited for high-speed digital logic or consumer-grade RF coupling.	Choose for non-automotive designs requiring faster switching or higher voltage headroom, with no qualification requirement.

Compared with BC849B,215, BC847B,215 trades gain for cost in non-critical switching, while MMBT3904LT1G offers speed and voltage headroom at the expense of automotive qualification and h_FE consistency - making BC849B,215 the optimal choice for AEC-Q101-compliant, thermally stable, medium-gain discrete amplification.

Availability

BC849B,215 is available at Aetrix Electronics and suitable for automotive lighting control, industrial sensor interfaces, appliance power sequencing, and medical diagnostic biasing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BC849B,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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

The BC849B belongs to Nexperia's AEC-Q101-qualified general-purpose transistor family, engineered specifically for robust, cost-effective discrete signal switching and amplification in harsh-environment automotive and industrial control systems.

FAQ

Is BC849B,215 suitable for automotive under-hood applications?

Yes. BC849B,215 is fully AEC-Q101 qualified with guaranteed operation from –55 °C to +150 °C junction temperature, 30 V V_CEO, and thermal resistance validated on FR4 PCB. It meets stress-test requirements for humidity, temperature cycling, and mechanical shock relevant to engine bay and transmission control modules.

What is the maximum continuous power dissipation for BC849B,215?

The total power dissipation (P_tot) is rated at 250 mW at T_amb ≤ 25 °C on a standard FR4 PCB with single-sided copper. Derating is required above 25 °C at 2.0 mW/°C, reaching zero dissipation at 150 °C ambient - consistent with its 150 °C maximum junction temperature rating.

Can BC849B,215 replace BC846B in existing designs?

No - BC846B has V_CEO = 65 V and h_FE = 110–220, while BC849B,215 is rated for 30 V and h_FE = 200–450. Substitution is unsafe in 48 V or higher supply applications and may cause premature failure due to overvoltage stress on the collector-emitter junction.

Does BC849B,215 have a documented ESD rating?

Per Nexperia's product documentation, BC849B,215 is not assigned a specific Human Body Model (HBM) or Charged Device Model (CDM) ESD rating. It follows standard handling precautions for plastic-packaged discretes (ANSI/ESDA/JEDEC JS-001 Class 1A minimum), and board-level protection is recommended for high-static environments.

BC849B,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):: 30 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

BC849B,215 FAQ

1.How can I place an order for BC849B,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC849B,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 BC849B,215 reliable?

The price and inventory of BC849B,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC849B,215 is usually 5 days.

3.What payment methods are accepted for BC849B,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC849B,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC849B,215?

BC849B,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC849B,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 BC849B,215?

For technical support, including BC849B,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC849B,215 requirements.

6.How does Aetrix verify that BC849B,215 is sourced from the original manufacturer or authorized distributors?

All BC849B,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 BC849B,215 meets industry standards.

7.What is the process for return or replacement of BC849B,215?

All BC849B,215 units undergo pre-shipment inspection (PSI). If there is an issue with BC849B,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 BC849B,215 part is unused and in its original packaging.

Return procedure for BC849B,215:

1.Submit a request within 90 days.

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

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