BD679 STMicroelectronics Transistor (Transistor Outline, Vertical) In Stock
BD679 is an NPN Darlington transistor from STMicroelectronics rated at 80 V collector-emitter voltage and 4 A collector current, featuring a built-in freewheeling diode and base resistors in a TO-126 package. Ideal for medium-power switching and motor control applications.
- Manufacturer
- STMicroelectronics
- Package
- Transistor Outline, Vertical
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- BD679 Datasheet PDF
- Category
- Transistor
- Price
- From $0.1310(MOQ 10)
- Temp Range
- ?°C to 150.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of BD679?
- NPN Darlington pair with minimum DC current gain (hFE) of 750, enabling high-current switching from low-level logic signals
- Integrated freewheeling diode and base-emitter resistors simplify circuit design and reduce external component count
- Rated 80 V collector-emitter voltage and 4 A collector current in a compact, isolated TO-126 (SOT-32) package
What is BD679 used for?
The BD679 is well-suited for medium-power motor drive circuits, relay drivers, and solenoid control where a single transistor must handle up to 4 A from a low-current logic source. Its built-in diode provides inductive-load protection, making it a practical choice for automotive auxiliaries, industrial control panels, and power supply regulation stages operating up to 80 V.
What are the specifications of BD679?
| Factory Lead Time | 14Weeks |
| YTEOL | 9 |
| Case Connection | ISOLATED |
| Collector Current-Max (IC) | 4A |
| Collector-Emitter Voltage-Max | 80V |
| Configuration | DARLINGTON WITH BUILT-IN DIODE AND RESISTOR |
| DC Current Gain-Min (hFE) | 750 |
| JEDEC-95 Code | TO-126 |
| JESD-30 Code | R-PSFM-T3 |
| JESD-609 Code | e3 |
| Number of Elements | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | FLANGE MOUNT |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Polarity/Channel Type | NPN |
| Power Dissipation Ambient-Max | 40W |
| Power Dissipation-Max (Abs) | 40W |
| Qualification Status | Not Qualified |
| Surface Mount | NO |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | THROUGH-HOLE |
| Terminal Position | SINGLE |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Transistor Application | SWITCHING |
| Transistor Element Material | SILICON |
| Transition Frequency-Nom (fT) | 10MHz |
| VCEsat-Max | 2.5V |
| ## BD679 Alternates Showing results | Image |
| Package | Transistor Outline, Vertical |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8541.29.00.95 |
| Country of Origin | India |
Where can I find the BD679 datasheet?
BD679 Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for BD679?
Compatible alternatives and drop-in replacements for BD679:
Power Bipolar Transistor, 4A I(C), 80V V(BR)CEO, 1-Element, NPN, Silicon, TO-126, Plastic/Epoxy, 3 Pin
suggested
suggested
Frequently Asked Questions
What is the maximum collector current the BD679 can handle continuously?
The BD679 is rated for a continuous collector current (IC) of 4 A, making it suitable for driving medium-power loads such as relays, solenoids, and small DC motors operating from supplies up to 80 V.
How does the BD679's minimum hFE of 750 benefit low-drive-current designs?
With a minimum DC current gain (hFE) of 750, the BD679 Darlington pair amplifies a base drive of only about 5 mA into a 4 A collector current, allowing microcontroller GPIO pins or small signal transistors to switch substantial loads without additional driver stages.
Why is the BD679 preferred over a single-stage NPN transistor for inductive load switching?
The BD679 integrates a built-in freewheeling diode and base-emitter resistors, eliminating the need for an external flyback diode when driving inductive loads like relays or motors at up to 80 V, which reduces board space and component count compared to a discrete single-stage NPN solution.
Which package does the BD679 use, and what are its key thermal mounting considerations?
The BD679 is housed in a TO-126 (SOT-32) package with an isolated case connection, allowing the heat sink to be grounded independently of the collector voltage. The package supports adequate heat dissipation for applications drawing up to 4 A at 80 V without requiring an insulating washer between the device and heat sink.
Related Guides
How to Choose Würth Elektronik 150141-Series SMD Indicator LEDs
Choose 150141RS73100 and related Würth 150141 LEDs by color, brightness, 3528 package fit, drive margin, and procurement controls.
Jul 15, 2026
Molex 53398-0371 Selection Guide: Choosing a 3-Circuit Wire-to-Board Header
Choose Molex 53398-0371 by circuit count, mating system, derating, PCB geometry, assembly needs, and exact-suffix sourcing.
Jul 15, 2026
53398-0371 Compact Wire-to-Board Connector Design Guide
Design a reliable 53398-0371 compact wire-to-board interface with proven layout, crimp, strain-relief, and validation practices.
Jul 14, 2026
742792651 Ferrite Bead Selection Guide for EMI and Power Integrity
Choose a 742792651-class ferrite bead by balancing impedance, DC bias, resistance, thermal limits, and filter stability.
Jul 14, 2026
Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 10+ | $0.3700 | $3.70 |
| 100+ | $0.3300 | $33.00 |
| 500+ | $0.3000 | $150.00 |
| 1000+ | $0.2190 | $219.00 |
| 1250+ | $0.1320 | $165.00 |
| 2500+ | $0.1310 | $327.50 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“The anti-counterfeit verification gave us confidence we'd never had with other China suppliers.”
You May Also Like
TLP222A-2(F)
Toshiba
Transistor
PVG612ASPBF
Infineon
Transistor
SI1016X-T1-GE3
Vishay
Transistor
2SCR513P5T100
ROHM Semiconductor
Transistor
IRF8915TRPBF
Infineon
Transistor
TLP183(BL,E
Toshiba
Transistor
SI5515CDC-T1-GE3
Vishay
Transistor
CGHV27015S
Cree, Inc.
Transistor
NST3946DP6T5G
ON Semiconductor
Transistor
IRLU120NPBF
Infineon
Transistor
CPH3461-TL-W
ON Semiconductor
Transistor
PBSS4350Z
Nexperia
Transistor
NSVJ3910SB3T1G
ON Semiconductor
Transistor
2N4393
Central Semiconductor
Transistor
BA12004BF-E2
ROHM Semiconductor
Transistor
BA12003BF-E2
ROHM Semiconductor
Transistor
IRLZ44
Vishay
Transistor
SMBTA06UPNE6327HTSA1
Infineon
Transistor
IRF7319TRPBF
Infineon
Transistor
IPP80P03P4L04AKSA1
Infineon
Transistor
PMN48XP,125
Nexperia
Transistor
IRLML6402TRPBF
Infineon
Transistor
ZTX788B
Diodes Inc.
Transistor
2SA1943-O(Q)
Toshiba
Transistor