Fairchild BC517 NPN Darlington Transistor User Guide
Summary
The BC517 is a high-performance NPN Darlington Transistor engineered for applications demanding exceptionally high current gain up to 1.0A. This datasheet provides circuit designers and engineers with comprehensive technical specifications, including absolute maximum ratings, detailed electrical characteristics, and crucial thermal handling data. Use this guide to ensure reliable integration into your power control circuits and switching designs.
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517 N PN arlington Transistor
January 2005
BC517 NPN Darlington Transistor This device is designed for applications requiring extremely high current gain at currents to 1.0A. Sourced from process 05.
TO-921
1. Collector 2. Base 3. Emitter
Absolute Maximum Ratings * Ta = 25°C unless otherwise noted Symbol Parameter Value Units VCEO Collector-Emitter Voltage
VCBO Collector-Base Voltage
VEBO Emitter-Base Voltage
IC Collector Current - Continuous 1.2
TJ, TSTG Operating and Storage Junction Temperature Range -55 ~ 150 °C
* These ratings are limiting values above which the serviceability of any semiconductor device may impaired.
NOTES: 1. These ratings are based on a maximum junction temperature of 150 degrees C.
2. These are steady state limits. The factory should be consulted on applications involving pulsed or low duty cycle operations.
Electrical Characteristics Ta = 25°C unless otherwise noted Symbol Parameter Conditions Min. Max Units Off Characteristics V(BR)CEO Collector-Emitter Breakdown Voltage * IC = 2.0m A, IB = 0 V(BR)CBO Collector-Base Breakdown Voltage IC = 10µA, IE = 0
V(BR)EBO Emitter-Base Breakdown Voltage IE = 100n A, IC = 0
ICBO Collector Cut-off Current VCB = 30V, IE = 0 n A
On Characteristics * h FE DC Current Gain VCE = 2.0V, IC = 20m A 30,000
VCE(sat) Collector-Emitter Saturation Voltage IC = 100m A, IB = 0.1m A
VBE(on) Base-Emitter On Voltage IC = 10m A, VCE = 5.0V 1.4
Thermal Characteristics Ta = 25°C unless otherwise noted Symbol Parameter Value Units PD Total Device Dissipation m W
Derate above 25°C 5.0 m W/°C
RθJC Thermal Resistance, Junction to Case 83.3 °C/W
RθJA Thermal Resistance, Junction to Ambient °C/W
©2005 Fairchild Semiconductor Corporation www.fairchildsemi.com BC517 Rev. A
Page Summary Contents For Fairchild BC517 NPN Darlington Transistor User Guide
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 3 |
| File Size | 27.41 KB |
| Published | May 31, 2026 |
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Frequently Asked Questions
Can this transistor be used in life support devices or systems?
No. It is not authorized for use as a critical component in life-support devices unless you receive express written approval from Fairchild Semiconductor Corporation.
What does the maximum junction temperature range allow?
The operating and storage junction temperature range is specified as -55 to 150 °C.
Are the provided ratings safe for pulsed operations?
No, these are steady-state limits. For applications involving pulsed or low duty cycle operations, you must consult the factory.