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BD681 The BD681 is a 100V, 4A NPN Darlington transistor from STMicroelectronics. It has a minimum DC current gain of 750 and a maximum power dissipation of 40W.
Mfr Part #:

BD681

Available from 4 distributors
Mfr Name: STMicroelectronics
STMicroelectronics
The BD681 is a 100V, 4A NPN Darlington transistor from STMicroelectronics. It has a minimum DC current gain of 750 and a maximum power dissipation of 40W.
✓ Total Stock: 87,116 pcs
$ Price Range: $0.34 - $1.82

BD681 Available from 4 distributors

✓ Authorised
✓ Non-Authorised
DistyParts aggregates offers from multiple distributors. Final prices, lead times and terms are subject to the distributors' discretion and may change without prior notice. DistyParts is not liable for any discrepancies.

BD681 Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Current
DC Current Gain (hFE) (Min) @ Ic, Vce
Mounting Type
Operating Temperature
Power
Supplier Device Package
Tape & Reel
Transistor Type
Vce Saturation (Max) @ Ib, Ic
Voltage
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BD681 Description

Short technical summary and product information.

The BD681 is an NPN Darlington transistor manufactured by STMicroelectronics. It is designed for circuits requiring high current gain and moderate power handling. The device features a collector-emitter breakdown voltage of 100V and a maximum collector current of 4A. It can dissipate up to 40W of power.

 

The transistor offers a minimum DC current gain (hFE) of 750 at a collector current of 1.5A and collector-emitter voltage of 3V. The collector-emitter saturation voltage is 2.5V at a base current of 30mA and a collector current of 1.5A. These characteristics make it suitable for both switching and linear amplification applications.

 

The BD681 is available in a through-hole TO-225AA / TO-126-3 package, with a supplier device package designation of SOT-32-3. Its maximum junction temperature is 150°C. The Darlington configuration provides high current gain from a relatively low base drive, simplifying driver circuitry.

BD681 Quick Information

Product Type: Darlington Transistor
Canonical Name: NPN Darlington Transistor
Subcategory: NPN Darlington

BD681 Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

BD681 Estimated Pricing

Qty Low High
1+ $1.82 $1.82
10+ $0.95 $0.95
100+ $0.70 $0.70
500+ $0.55 $0.55
1,000+ $0.50 $0.50
2,000+ $0.38 $0.38
4,000+ $0.35 $0.35
10,000+ $0.35 $0.35
24,000+ $0.34 $0.34

Estimated market price range - modelled values for guidance only, not live distributor offers.

BD681 Features

  • 100V collector-emitter breakdown voltage.
  • 4A collector current rating.
  • 40W maximum power dissipation.
  • 750 minimum DC current gain.
  • Through-hole SOT-32-3 package.

BD681 Applications

  • For switching circuits needing high current gain.
  • For power amplification up to 40W.
  • For driving loads at currents to 4A.

BD681 FAQs

7 frequently asked questions generated from this part’s specifications.
What is the collector-emitter breakdown voltage of the BD681?

100 V.

What package is the BD681 available in?

TO-225AA, TO-126-3 case with a SOT-32-3 supplier device package.

What is the maximum operating temperature of the BD681?

150°C (junction temperature).

Is the BD681 RoHS compliant?

It is listed as RoHS3 compliant.

What is the maximum collector current of the BD681?

4 A.

What is the maximum power dissipation of the BD681?

40 W.

What is the minimum DC current gain of the BD681?

750 at a collector current of 1.5A and Vce of 3V.

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