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

Nexperia USA Inc. BC817-40-QVL

Name: BC817-40-QVL
Brand: Nexperia USA Inc.
SKU: BC817-40-QVL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC817-40-QVL

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: BC817-40-QVL.pdf

Description:: TRANS NPN 45V 0.5A TO-236AB

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Product details

Overview

BC817-40-QVL from Nexperia is a 45 V, 500 mA NPN general-purpose transistor in SOT23 (TO-236AB) package, with DC current gain (h_FE) of 250–600 at V_CE = 1 V and I_C = 100 mA, V_CE(sat) ≤ 700 mV at I_C = 500 mA/I_B = 50 mA, and AEC-Q101 qualified for automotive use. It serves as a low-voltage switching and amplification device in power management and signal conditioning circuits.

For engineers reviewing the BC817-40-QVL datasheet, BC817-40-QVL pinout, BC817-40-QVL application, or BC817-40-QVL equivalent, key selection criteria include its 45 V V_CEO, 500 mA continuous collector current, 250–600 h_FE range, SOT23 footprint compatibility, and AEC-Q101 qualification for under-hood automotive modules.

Technical Context

This NPN bipolar junction transistor operates in linear and saturation regions for analog amplification and digital switching. Its h_FE range (250–600) enables stable biasing across temperature (−55 °C to 150 °C) and supports base-driven current control with predictable V_BE ≈ 1.2 V at I_C = 500 mA.

The device features 50 V V_CBO, 5 V V_EBO, and thermal resistance R_th(j-a) of 500 K/W on standard FR4 PCB - enabling reliable operation in space-constrained, thermally unassisted applications such as LED drivers and sensor interface stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum safe collector-emitter voltage before breakdown; defines rail voltage headroom in 24 V automotive systems.
I_C	500 mA - Continuous collector current rating; supports driving small relays, LEDs, or logic-level MOSFET gates.
h_FE	250–600 at V_CE = 1 V, I_C = 100 mA - High and tightly binned current gain ensures consistent base drive requirements across production lots.
V_CE(sat)	≤ 700 mV at I_C = 500 mA, I_B = 50 mA - Low saturation voltage minimizes conduction loss and self-heating in switching applications.
P_tot	250 mW (standard footprint) / 345 mW (enhanced pad) - Power dissipation limits define PCB copper area requirements for thermal reliability.
f_T	100 MHz - Transition frequency supports high-speed switching up to ~10 MHz with adequate gain margin.
R_th(j-a)	500 K/W - Junction-to-ambient thermal resistance on standard FR4; informs derating curves for ambient temperatures above 25 °C.

Pinout & Package

SOT23 (TO-236AB) surface-mount plastic 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-020/001.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Current-controlled input node; requires ~12 mA base drive for 500 mA collector switching at h_FE = 40 minimum.
2	Emitter (E)	Reference terminal for bias network; connected to ground or low-side return path in common-emitter configurations.
3	Collector (C)	High-current output node; electrically isolated from PCB ground plane when used in high-side switch topologies with external pull-up.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, body electronics, and ADAS subsystems.
Three h_FE bins	BC817-40-Q offers 250–600 h_FE, enabling precise gain matching in feedback loops and reducing calibration overhead in production test.
Low V_CE(sat)	≤ 700 mV at full rated current ensures <150 mW conduction loss, easing thermal design in sealed enclosures or multi-device layouts.
SOT23 footprint	Industry-standard 3-pin SMT package enables drop-in replacement with BC847, MMBT3904, or ZTX653 without board redesign.
Thermal robustness	150 °C max junction temperature and defined derating curves support operation in under-hood environments up to 125 °C ambient.

Applications

Automotive Door Module

Industrial Sensor Interface

Use Scenario: Driving window lift motor relays and LED status indicators in door control units.

IC Role / Device Role / Timing Role: NPN switch controlling 12 V relay coils and 20 mA indicator LEDs via microcontroller GPIO.

Use Value: 45 V V_CEO withstands load-dump transients; AEC-Q101 qualification ensures 15-year field reliability in vibration-prone environments.

Use Scenario: Level-shifting and buffering analog signals from 3.3 V sensors to 5 V ADC inputs in PLC I/O modules.

IC Role / Device Role / Timing Role: Common-emitter amplifier with fixed-gain bias network for signal conditioning prior to digitization.

Use Value: 250–600 h_FE bin enables predictable gain stability over −40 °C to 85 °C operating range without active compensation.

Consumer Appliance Motor Control

Medical Diagnostic Equipment

Use Scenario: Switching small DC brush motors in smart home appliances (e.g., coffee grinders, air purifiers).

IC Role / Device Role / Timing Role: Low-side switch activated by MCU PWM output to regulate motor speed and direction.

Use Value: 500 mA I_C and 700 mV V_CE(sat) limit power loss to <350 mW, eliminating need for heatsinking in compact enclosures.

Use Scenario: Isolating and amplifying low-level biopotential signals (ECG, EMG) in portable diagnostic devices.

IC Role / Device Role / Timing Role: Pre-amplifier stage with emitter-follower configuration for high-input-impedance buffering.

Use Value: Low noise and stable h_FE ensure minimal signal distortion; SOT23 size supports high-density front-end analog routing.

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
MMBT3904LT1G	h_FE = 100–300 (lower gain), V_CEO = 40 V, not AEC-Q101 qualified	Consumer-grade only; unsuitable for automotive safety-critical functions	Select when cost sensitivity outweighs gain stability and automotive compliance.
ZTX653	h_FE = 200–800, V_CEO = 60 V, TO-92 package (through-hole), higher P_tot = 1 W	Requires PCB rework for SMT-to-through-hole conversion; better for high-power prototyping	Choose for legacy designs needing higher voltage margin and manual assembly flexibility.

Compared with MMBT3904LT1G, BC817-40-QVL delivers higher and binned h_FE, AEC-Q101 compliance, and superior transient voltage tolerance; versus ZTX653, it trades package size and thermal capacity for SMT scalability and automotive qualification.

Availability

BC817-40-QVL is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer appliance motor control, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for BC817-40-QVL 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, and consumer markets.

The BC817-Q series targets cost-sensitive, high-volume applications demanding AEC-Q101 reliability, tight h_FE binning, and proven SOT23 manufacturability - especially in automotive interior modules and industrial edge nodes.

FAQ

What is the maximum allowable base current for continuous operation?

The peak base current rating is 200 mA for single pulses (t_p ≤ 1 ms), but continuous operation must limit I_B to maintain junction temperature ≤ 150 °C. At I_C = 500 mA and h_FE = 250, nominal I_B = 2 mA; sustained I_B > 5 mA requires thermal analysis using R_th(j-a) = 500 K/W and ambient conditions.

Is BC817-40-QVL pin-compatible with BC847 variants?

Yes - both use identical SOT23 pinout (1 = B, 2 = E, 3 = C) and mechanical footprint. However, BC847 has lower V_CEO (45 V vs. 50 V), narrower h_FE range (110–800), and no AEC-Q101 qualification, so substitution requires validation of gain stability and automotive compliance.

How does thermal performance change with PCB copper area?

With a 1 cm² collector pad, R_th(j-a) improves from 500 K/W to 362 K/W, increasing allowable power dissipation from 250 mW to 345 mW at T_amb = 25 °C. Derating curves in Figure 1 show linear reduction beyond 25 °C, requiring ≥ 200 mm² copper for 400 mW operation at 70 °C ambient.

What marking code identifies BC817-40-QVL on the package?

The top-side marking is "6C%", where "6C" denotes the BC817-40-Q variant and "%" is a placeholder for the manufacturing site code (e.g., "6CA" for one facility). This matches Table 5 in the Nexperia datasheet and distinguishes it from BC817-16-Q ("6A%") and BC817-25-Q ("6B%").

BC817-40-QVL Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BC817-Q

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 45 V

Vce Saturation (Max) @ Ib, Ic:: 700mV @ 50mA, 500mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 250 @ 100mA, 1V

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

BC817-40-QVL FAQ

1.How can I place an order for BC817-40-QVL through Aetrix?

Please submit a Request for Quotation (RFQ) for BC817-40-QVL 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 BC817-40-QVL reliable?

The price and inventory of BC817-40-QVL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817-40-QVL is usually 5 days.

3.What payment methods are accepted for BC817-40-QVL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817-40-QVL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC817-40-QVL?

BC817-40-QVL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC817-40-QVL 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 BC817-40-QVL?

For technical support, including BC817-40-QVL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817-40-QVL requirements.

6.How does Aetrix verify that BC817-40-QVL is sourced from the original manufacturer or authorized distributors?

All BC817-40-QVL 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 BC817-40-QVL meets industry standards.

7.What is the process for return or replacement of BC817-40-QVL?

All BC817-40-QVL units undergo pre-shipment inspection (PSI). If there is an issue with BC817-40-QVL, 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 BC817-40-QVL part is unused and in its original packaging.

Return procedure for BC817-40-QVL:

1.Submit a request within 90 days.

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

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