Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Diodes Incorporated BC817-25-7-F

Name: BC817-25-7-F
Brand: Diodes Incorporated
SKU: BC817-25-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BC817-25-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

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

Datasheet:: BC817-25-7-F.pdf

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

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:11,783

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BC817-25-7-F from Diodes Incorporated is a 45V NPN small-signal transistor in SOT23 package, optimized for switching and audio-frequency amplifier applications. It delivers h_FE = 160–400 at I_C = 100mA, V_CE(SAT) ≤ 0.7V at I_C = 500mA/I_B = 50mA, and f_T = 100MHz, with AEC-Q101 qualification for automotive reliability.

For engineers reviewing the BC817-25-7-F datasheet, BC817-25-7-F pinout, BC817-25-7-F application, or BC817-25-7-F equivalent, key selection criteria include DC current gain range, saturation voltage under high-current drive, thermal resistance (R_θJA = 403°C/W), and SOT23 lead-free compliance for automated assembly.

Technical Context

This NPN bipolar junction transistor uses epitaxial planar die construction to ensure stable gain and low leakage across temperature. Its 50V V_CBO, 45V V_CEO, and 5V V_EBO ratings support robust operation in low-voltage control and signal amplification stages.

The device operates across –65°C to +150°C, with ESD HBM rating of 8kV and MM rating of 400V. Thermal derating begins above 25°C ambient, with maximum power dissipation dropping linearly to zero at 150°C junction temperature.

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 (I_C = 100mA)	160–400 - Confirmed DC current gain range enabling predictable base drive sizing for switching loads up to 500mA
V_CE(SAT)	≤ 0.7 V @ I_C = 500mA, I_B = 50mA - Ensures low conduction loss and minimal self-heating in saturated switch mode
f_T	100 MHz - Supports stable amplification and switching up to mid-AF range without gain roll-off
R_θJA	403 °C/W - Defines thermal rise per watt on standard FR-4 PCB; requires layout attention for >200mW continuous operation
ESD HBM	8,000 V - Enables handling without special ESD controls during board assembly and rework

Pinout & Package

Package: SOT23 - Surface-mount plastic case, 0.008g weight, UL 94V-0 rated, matte tin-plated leads solderable per MIL-STD-202 Method 208.

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 to modulate collector current; requires series resistor for digital GPIO interfacing
3 (Collector)	Current source terminal	Connects to load supply rail; carries switched load current up to 500mA DC or 1A peak

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per JEDEC standards
Lead-free & Halogen-free	Fully RoHS-compliant with <900ppm Br/Cl and <1000ppm Sb; supports "Green" manufacturing and end-of-life recycling
Epitaxial planar construction	Delivers tight h_FE distribution and low leakage (I_CES ≤ 100nA at V_CE = 45V) across production lots
Optimized for automatic insertion	SOT23 footprint and marking (K6B) enable high-yield pick-and-place and AOI inspection in SMT lines

Applications

LED Driver Circuit

Microcontroller GPIO Expander

Use Scenario: Driving 20mA–100mA indicator or status LEDs from 3.3V/5V logic rails.

IC Role / Device Role / Timing Role: NPN switch controlling LED anode-to-V_CC or cathode-to-ground paths with fast turn-on/turn-off.

Use Value: Low V_CE(SAT) minimizes voltage drop and power loss; h_FE ≥ 160 ensures full saturation with ≤5mA base drive from MCU pins.

Use Scenario: Amplifying weak sensor signals or buffering logic-level signals between mixed-voltage subsystems.

IC Role / Device Role / Timing Role: Common-emitter amplifier stage providing 20–30dB voltage gain at AF frequencies.

Use Value: f_T = 100MHz ensures flat gain response up to 10kHz; low noise and consistent h_FE improve signal fidelity in analog front-ends.

Automotive Door Module

Industrial Relay Interface

Use Scenario: Controlling window lift motors, mirror actuators, or interior lighting in AEC-Q101-compliant modules.

IC Role / Device Role / Timing Role: High-reliability load switch interfacing microcontroller outputs to 12V inductive loads.

Use Value: Qualified operation from –40°C to +125°C ambient; 8kV HBM ESD withstand protects against assembly and field handling events.

Use Scenario: Isolating PLC output cards from 24V relay coils in factory automation panels.

IC Role / Device Role / Timing Role: Solid-state replacement for mechanical relay drivers requiring fast, bounce-free switching.

Use Value: 500mA I_C rating supports direct coil drive; low R_θJA enables compact heatsink-free layout in dense I/O modules.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN small-signal transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC817-40-7-F	Higher h_FE (250–600), same V_CEO/I_C/package	Better suited for low-base-drive circuits; may require tighter bias tolerance to avoid overdrive	Select when base current is constrained (e.g., weak GPIO) and gain consistency at low I_C is critical
MMBT3904LT1G	h_FE = 100–300 (I_C = 10mA), lower f_T = 300MHz, same SOT23	Higher gain at low current but reduced linearity at >100mA; not AEC-Q101 qualified	Prefer for general-purpose non-automotive designs where cost or availability outweighs automotive qualification

Compared with BC817-40-7-F, this part trades gain headroom for tighter h_FE spread at mid-current; versus MMBT3904LT1G, it offers guaranteed automotive reliability and superior saturation performance at 500mA, justifying use in safety-critical or thermally constrained systems.

Availability

BC817-25-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, automotive door modules, and industrial relay interfaces requiring stable component supply and AEC-Q101 traceability.

Supply support for BC817-25-7-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 consumer markets.

The BC817 series belongs to Diodes' AEC-Q101-qualified small-signal transistor product line, designed specifically for robust switching and amplification in harsh-environment automotive ECUs and industrial control units.

FAQ

What is the maximum continuous collector current for BC817-25-7-F?

The absolute maximum continuous collector current is 0.5 A at T_A = +25°C. Derating applies above 25°C ambient: power dissipation drops linearly to zero at 150°C junction temperature, limiting usable I_C in high-temperature enclosures unless thermal relief is added.

Is BC817-25-7-F suitable for linear amplifier applications?

Yes - its f_T = 100MHz, low V_CE(SAT), and stable h_FE across I_C = 10–300mA make it appropriate for Class-A audio preamplifiers and sensor signal conditioning. However, thermal design must accommodate 310mW P_D on standard FR-4 to avoid gain drift.

Does BC817-25-7-F have a complementary PNP version?

Yes - the BC807 series (BC807-16/-25/-40) is the direct PNP complement, sharing identical SOT23 packaging, voltage ratings, and AEC-Q101 qualification. Pinout is mirrored: Emitter (Pin 1), Base (Pin 2), Collector (Pin 3).

What does the "-7-F" suffix indicate in BC817-25-7-F?

The "-7-F" denotes tape-and-reel packaging: 3,000 units per 7-inch reel, 8mm tape width, with "F" indicating Diodes Incorporated's green, halogen-free, RoHS-compliant construction. The "K6B" marking on the device body identifies the BC817-25 variant.

BC817-25-7-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:: 160 @ 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

BC817-25-7-F FAQ

1.How can I place an order for BC817-25-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BC817-25-7-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 BC817-25-7-F reliable?

The price and inventory of BC817-25-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC817-25-7-F is usually 5 days.

3.What payment methods are accepted for BC817-25-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC817-25-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC817-25-7-F?

BC817-25-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC817-25-7-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 BC817-25-7-F?

For technical support, including BC817-25-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC817-25-7-F requirements.

6.How does Aetrix verify that BC817-25-7-F is sourced from the original manufacturer or authorized distributors?

All BC817-25-7-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 BC817-25-7-F meets industry standards.

7.What is the process for return or replacement of BC817-25-7-F?

All BC817-25-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BC817-25-7-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 BC817-25-7-F part is unused and in its original packaging.

Return procedure for BC817-25-7-F:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…