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

Diodes Incorporated BC817-40Q-13-F

Name: BC817-40Q-13-F
Brand: Diodes Incorporated
SKU: BC817-40Q-13-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC817-40Q-13-F

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

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

Datasheet:: BC817-40Q-13-F.pdf

Description:: TRANS NPN 45V 0.5A SOT-23-3

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Product details

Overview

BC817-40Q-13-F from Diodes Incorporated is an AEC-Q101 qualified 45V NPN bipolar junction transistor in SOT23 package, delivering h_FE = 250–600 at I_C = 100mA, V_CE = 1.0V, with 500mA continuous collector current and 8kV HBM ESD rating. It serves as a switching and audio-frequency amplifier device in automotive body control modules, LED drivers, and sensor interface circuits.

For engineers reviewing the BC817-40Q-13-F datasheet, BC817-40Q-13-F pinout, BC817-40Q-13-F application, or BC817-40Q-13-F equivalent, key selection criteria include DC current gain spread (250–600), V_CE(sat) ≤ 0.7V at I_C = 500mA/I_B = 50mA, AEC-Q101 qualification, SOT23 thermal resistance (R_θJA = 403°C/W), and automotive-grade traceability.

Technical Context

This NPN BJT uses epitaxial planar die construction for stable gain and low leakage, optimized for automatic insertion in high-reliability automotive PCB assembly. Its 45V V_CEO, 50V V_CBO, and 5V V_EBO support robust operation in 12V/24V vehicle subsystems under load dump or transient overvoltage conditions.

The device exhibits f_T = 100MHz at V_CE = 5V, I_C = 10mA, enabling use in low-speed digital switching and AF amplification up to ~10MHz. Thermal derating begins at 25°C ambient, with full 310mW dissipation only achievable on minimal FR-4 pad layout.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration
h_FE	250–600 - DC current gain range at I_C = 100mA, V_CE = 1.0V, defining base drive sizing margin
I_C (cont)	0.5 A - Continuous collector current limit determining max load switching capability
V_CE(sat)	≤ 0.7 V - Saturation voltage at I_C = 500mA/I_B = 50mA, directly impacting conduction loss and heat generation
f_T	100 MHz - Transition frequency indicating usable bandwidth for small-signal amplification or fast switching
ESD HBM	8,000 V - Human Body Model rating confirming robustness against handling-induced electrostatic discharge
R_θJA	403 °C/W - Junction-to-ambient thermal resistance on standard FR-4, governing temperature rise under power dissipation

Pinout & Package

Package: SOT23 - Surface-mount plastic package with matte tin-plated leads, UL 94V-0 rated, 0.008g weight, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Reference node for biasing; connects to ground or low-side return path in switch configurations
2 (Base)	Control input	Receives current-limited drive signal to saturate or cut off the transistor; requires series resistor for current limiting
3 (Collector)	Current source terminal	Connects to load and supply rail; carries full switched current and dissipates power during saturation

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive applications including temperature cycling, mechanical shock, and humidity testing per JESD22
Epitaxial planar die construction	Ensures consistent h_FE distribution and low leakage across production lots and temperature ranges
Green, halogen-free packaging	Meets RoHS 3 (2015/863/EU) with Br+Cl < 1500ppm and Sb < 1000ppm, supporting eco-compliant manufacturing
1A peak pulse current (I_CM)	Supports short-duration inrush or surge loads without device failure, extending reliability in intermittent switching

Applications

Automotive Body Control Module

LED Driver Circuit

Use Scenario: Driving relays, solenoids, and window motor logic in 12V vehicle platforms with load dump transients.

IC Role / Device Role / Timing Role: NPN switch controlling high-side or low-side loads via microcontroller GPIO with current amplification.

Use Value: 45V V_CEO withstands ISO 7637-2 pulse 1 (−100V) clamped systems; 0.5A I_C supports typical 300–400mA relay coils.

Use Scenario: Constant-current dimming of interior lighting arrays using PWM-controlled base drive.

IC Role / Device Role / Timing Role: Linear or saturated switch regulating LED string current in response to MCU PWM duty cycle.

Use Value: Low V_CE(sat) ≤ 0.7V minimizes power loss and self-heating at 350mA typical LED current.

Sensor Signal Conditioning

Industrial Fan Speed Control

Use Scenario: Amplifying low-level analog outputs from Hall-effect or thermistor-based sensors in engine bay environments.

IC Role / Device Role / Timing Role: Common-emitter AF amplifier stage providing 20–40dB voltage gain before ADC input.

Use Value: h_FE ≥ 250 ensures stable gain at −40°C to +125°C; 100MHz f_T preserves signal fidelity up to 10kHz bandwidth.

Use Scenario: Controlling 24V DC brushless fan speed via microcontroller-driven PWM in HVAC control units.

IC Role / Device Role / Timing Role: Low-side switch modulating fan voltage by rapidly turning on/off collector current path.

Use Value: 1A I_CM handles startup inrush; AEC-Q101 qualification guarantees operation at 105°C ambient under hood conditions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC817-40,115 (Nexperia)	Same h_FE range (250–600), but not AEC-Q101 qualified; R_θJA = 390°C/W on same footprint	Lacks PPAP documentation and IATF 16949 traceability; unsuitable for Tier-1 automotive BOMs	Select when cost-sensitive industrial or consumer designs require identical gain and package without automotive compliance
MMBT4401LT1G (onsemi)	Higher V_CEO = 40V (vs. 45V); h_FE = 100–300 at I_C = 150mA; 600mW P_D	Lower gain consistency and reduced voltage margin limit use in 24V systems with transients	Prefer where higher power dissipation (600mW) is needed and 40V rating suffices for nominal 12V operation

Compared with BC817-40,115 and MMBT4401LT1G, the BC817-40Q-13-F uniquely combines AEC-Q101 qualification, 45V V_CEO, and guaranteed h_FE ≥ 250 - making it the only choice for automotive-grade switching where both reliability and parametric consistency are mandatory.

Availability

BC817-40Q-13-F is available at Aetrix Electronics and suitable for automotive body control modules, LED driver circuits, sensor signal conditioning, and industrial fan speed control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BC817-40Q-13-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.

The BC817-Q series belongs to Diodes' automotive-qualified small-signal transistor product line, engineered specifically for AEC-Q101 compliance, PPAP readiness, and operation in harsh environments including under-hood and chassis-mounted applications.

FAQ

What is the maximum operating temperature for BC817-40Q-13-F?

The BC817-40Q-13-F has an operating junction temperature range of −65°C to +150°C, validated per AEC-Q101 stress tests. Its thermal resistance (R_θJA = 403°C/W) means that at 310mW dissipation on standard FR-4, junction temperature rises ~125°C above ambient - limiting practical continuous operation to ≤ 25°C ambient unless heatsinking or derating is applied.

Is BC817-40Q-13-F pin-compatible with BC817-40?

Yes - both use identical SOT23 package with emitter-base-collector pinout (1-2-3). However, BC817-40Q-13-F is AEC-Q101 qualified, manufactured in IATF 16949 facilities, and includes PPAP documentation; standard BC817-40 lacks automotive change control and traceability, making them mechanically compatible but not functionally interchangeable in certified automotive designs.

What does the "Q" suffix indicate in BC817-40Q-13-F?

The "Q" suffix denotes Diodes Incorporated's automotive-grade product family: AEC-Q101 qualified, PPAP capable, manufactured in IATF 16949 certified facilities, and compliant with RoHS 3 and halogen-free requirements. It distinguishes this variant from commercial-grade BC817-40 parts, which lack automotive process controls and documentation.

Can BC817-40Q-13-F replace BC847B in existing designs?

No - BC847B has V_CEO = 45V but only h_FE = 200–450 and is not AEC-Q101 qualified. While pinout matches, BC817-40Q-13-F offers higher minimum h_FE (250), 8kV HBM ESD rating (vs. 4kV), and automotive qualification. Replacement requires validation of gain margin, thermal performance, and compliance documentation for target application.

BC817-40Q-13-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

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):: 500 mA

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

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

Current - Collector Cutoff (Max):: 100nA

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

Power - Max:: 310 mW

Frequency - Transition:: 100MHz

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BC817-40Q-13-F FAQ

1.How can I place an order for BC817-40Q-13-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BC817-40Q-13-F 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 BC817-40Q-13-F reliable?

The price and inventory of BC817-40Q-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817-40Q-13-F is usually 5 days.

3.What payment methods are accepted for BC817-40Q-13-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817-40Q-13-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC817-40Q-13-F?

BC817-40Q-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC817-40Q-13-F 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 BC817-40Q-13-F?

For technical support, including BC817-40Q-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817-40Q-13-F requirements.

6.How does Aetrix verify that BC817-40Q-13-F is sourced from the original manufacturer or authorized distributors?

All BC817-40Q-13-F 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 BC817-40Q-13-F meets industry standards.

7.What is the process for return or replacement of BC817-40Q-13-F?

All BC817-40Q-13-F units undergo pre-shipment inspection (PSI). If there is an issue with BC817-40Q-13-F, 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 BC817-40Q-13-F part is unused and in its original packaging.

Return procedure for BC817-40Q-13-F:

1.Submit a request within 90 days.

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

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