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Beginner’s Guide to the BC817-40 Transistor

The BC817-40 transistor is a versatile component used in many electronics for switching and amplifying signals. In this article, you’ll learn about its features, uses, and how it can be applied in your projects.

Catalog

Overview of BC817-40 Transistor

The BC817-40 is a 45V NPN small signal transistor created by Diodes Incorporated, housed in a compact SC−59/SOT23 package. It's suited for switching and audio frequency amplifier applications, providing steady performance across various uses. This transistor is easy to integrate into automated production, offering a lead-free design that meets strict reliability standards. With its stable, efficient operation, the BC817-40 serves well in projects needing a dependable NPN transistor.

BC817-40 Pin Configuration

BC817-40 CAD Model

BC817-40 Symbol

BC817-40 Footprint

Key Features of BC817-40

Suitable for Automatic Insertion

The BC817-40 is designed to work well in automated manufacturing, making it ideal for high-volume production. Its structure allows for efficient placement in assembly lines, helping speed up production without compromising on quality.

Epitaxial Planar Die Construction

With its epitaxial planar die construction, this transistor offers stable performance in a variety of applications. This design also provides reliable electrical characteristics, so you can use it confidently in different types of circuits.

Compatible PNP Types Available

If your circuit needs both NPN and PNP transistors, you’ll find compatible PNP versions that pair easily with the BC817-40. This lets you design complementary circuits more easily while keeping your components consistent.

Ideal for Switching and AF Amplifier Applications

The BC817-40 works well in both switching and audio frequency (AF) amplifier applications. In switching, it ensures smooth transitions, while in AF amplifiers, it handles signals reliably, giving you flexibility to use it across different roles in your project.

Lead-Free and RoHS Compliant

This transistor meets RoHS standards and is lead-free, making it a safer choice for both people and the environment. Its compliance means you can use it in regions that require eco-friendly materials without any issues.

Halogen and Antimony Free

As a “green” device, the BC817-40 is free from halogen and antimony, which makes it a safer option for disposal and recycling. This eco-friendly feature supports sustainable design choices.

Qualified to AEC-Q101 Standards

This transistor meets AEC-Q101 standards, so you can trust its reliability in projects where you need dependable, long-term performance. It’s well-suited for areas like automotive, industrial, and consumer electronics, where consistency matters.

Mechanical Data of BC817-40

Case Type

The BC817-40 comes in a compact SOT23 case, a popular choice for small signal transistors. This size helps save space in your design, which is useful when you’re working with limited room on the circuit board.

Case Material

Its case is made from molded plastic with a “green” compound that meets UL Flammability Classification Rating 94V-0. This durable material keeps the transistor safe from environmental stress, giving it lasting protection.

Moisture Sensitivity

Rated at Level 1 per J-STD-020, the BC817-40 has low moisture sensitivity. This means you can store it in various environments without worrying about special handling, making it convenient to work with.

Terminal Finish

The terminals have a matte tin finish, which ensures good solderability with different soldering methods. This finish allows for strong connections that resist corrosion, giving you reliable bonding within the circuit.

Weight

At around 0.008 grams, the BC817-40 is extremely lightweight, making it a practical choice for portable or compact designs where every gram counts. Its minimal weight won’t affect your design’s overall weight.

Specifications of BC817-40

Technical specifications, features, characteristics, and components with comparable specifications of Diodes Incorporated BC817-40

Type	Parameter
Factory Lead Time	19 Weeks
Contact Plating	Tin
Mount	Surface Mount
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
Number of Pins	3
Weight	7.994566mg
Transistor Element Material	SILICON
Collector-Emitter Breakdown Voltage	45V
Current-Collector (Ic) (Max)	500mA
Number of Elements	1
Operating Temperature	-65°C~150°C TJ
Packaging	Tape & Reel (TR)
Series	Automotive, AEC-Q101
Published	2005
JESD-609 Code	e3
Pbfree Code	yes
Part Status	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Number of Terminations	3
ECCN Code	EAR99
Additional Feature	HIGH RELIABILITY
Max Power Dissipation	310mW
Terminal Position	DUAL
Terminal Form	GULL WING
Peak Reflow Temperature (Cel)	260
Frequency	100MHz
Time@Peak Reflow Temperature-Max (s)	40
Base Part Number	BC817
Pin Count	3
Element Configuration	Single
Power Dissipation	350mW
Transistor Application	SWITCHING
Gain Bandwidth Product	100MHz
Polarity/Channel Type	NPN
Transistor Type	NPN
Collector Emitter Voltage (VCEO)	45V
Max Collector Current	800mA
DC Current Gain (hFE) (Min) @ Ic, Vce	250 @ 100mA 1V
Current - Collector Cutoff (Max)	100nA
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA
Transition Frequency	100MHz
Max Breakdown Voltage	45V
Collector Base Voltage (VCBO)	50V
Emitter Base Voltage (VEBO)	5V
Height	1mm
Length	3.05mm
Width	1.4mm
REACH SVHC	No SVHC
Radiation Hardening	No
RoHS Status	ROHS3 Compliant
Lead Free	Lead Free

Equivalent Transistors for BC817-40

Model Number	Manufacturer	Description
BC817-40-R2-00001	PanJit Semiconductor	Small Signal Bipolar Transistor
BC817-40,215	NXP Semiconductors	BC817; BC817W; BC337 - 45 V, 500 mA NPN general-purpose transistors TO-236 3-Pin
BC817-40TRL	NXP Semiconductors	TRANSISTOR 500 mA, 45 V, NPN, Si, SMALL SIGNAL TRANSISTOR, BIP General Purpose Small Signal
BC817-40Q-7-F	Diodes Incorporated	Small Signal Bipolar Transistor, 0.5A I(C), NPN
BC817-40-R1-00001	PanJit Semiconductor	Small Signal Bipolar Transistor
BC817-40TC	Zetex / Diodes Inc	Small Signal Bipolar Transistor, 0.5A I(C), 45V V(BR)CEO, 1-Element, NPN, Silicon, SOT-23, 3 PIN
BC817-40-AU-R1-000A1	PanJit Semiconductor	Small Signal Bipolar Transistor
BC817.40	Central Semiconductor Corp	Small Signal Bipolar Transistor, 0.5A I(C), 45V V(BR)CEO, 1-Element, NPN, Silicon, SOT-23, 3 PIN
BC817-40E6327	Rochester Electronics LLC	500mA, 45V, NPN, Si, SMALL SIGNAL TRANSISTOR
BC817-40-13	Diodes Incorporated	Small Signal Bipolar Transistor, 0.8A I(C), 45V V(BR)CEO, 1-Element, NPN, Silicon, PLASTIC PACKAGE-3

Parts with Similar Specifications to BC817-40

The parts listed have specifications similar to the Diodes Incorporated BC817-40

Part Number	Manufacturer	Mount	Package / Case	Collector Emitter Breakdown Voltage	Max Collector Current	Transition Frequency	Collector Emitter Saturation Voltage	Max Power Dissipation	Power Dissipation
BC817-40-7-F	Diodes Incorporated	Surface Mount	TO-236-3, SC-59, SOT-23	45 V	800 mA	100 MHz	700 mV	310 mW	350 mW
BC817-16-7-F	Diodes Incorporated	Surface Mount	TO-236-3, SC-59, SOT-23	45 V	800 mA	100 MHz	700 mV	310 mW	350 mW
BC81716MTF	ON Semiconductor	Surface Mount	TO-236-3, SC-59, SOT-23	45 V	800 mA	100 MHz	700 mV	310 mW	350 mW
BC817-25-7-F	Diodes Incorporated	Surface Mount	TO-236-3, SC-59, SOT-23	45 V	800 mA	100 MHz	700 mV	310 mW	350 mW
BCW66G	ON Semiconductor	Surface Mount	TO-236-3, SC-59, SOT-23	45 V	1 A	-	700 mV	350 mW	350 mW

Package Details of BC817-40

BC817-40 Package View A

BC817-40 Package View B

BC817-40 Package View C

Marking Information for BC817-40

Recommended Pad Layout for BC817-40

The following diagram shows the BC817-40 Suggested Pad Layout.

About Diodes Incorporated

Diodes Incorporated delivers high-quality semiconductor products to major markets, including consumer electronics, computing, communications, industrial, and automotive sectors. Their product range covers discrete, analog, and mixed-signal devices, aimed at meeting diverse technology needs. With 25 global sites focused on engineering, testing, manufacturing, and customer support, Diodes Incorporated remains a trusted choice for industries looking for reliable, well-designed semiconductor solutions.

Datasheet PDF

BC817-40,215 Datasheet:

BC817-40,215.pdf

BC817-40Q-7-F Datasheet:

BC817-40Q-7-F.pdf

BC817-40-7-F Datasheet:

BC817-40-7-F.pdf

BC817-16-7-F Datasheet:

BC817-16-7-F.pdf

BC81716MTF Datasheet:

BC81716MTF.pdf

BC817-25-7-F Datasheet:

BC817-25-7-F.pdf

BCW66G Datasheet:

BCW66G.pdf