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Product Detailed Parameters
- Description：TRANS NPN DARL 100V 4A TO-126-3
- Series：-
- Mfr：Fairchild Semiconductor
- Package：Bulk
- Transistor Type：NPN - Darlington
- Current - Collector (Ic) (Max)：4:00 AM
- Voltage - Collector Emitter Breakdown (Max)：100 V
- Vce Saturation (Max) @ Ib, Ic：2.5V @ 30mA, 1.5A
- Current - Collector Cutoff (Max)：500µA
- DC Current Gain (hFE) (Min) @ Ic, Vce：750 @ 1.5A, 3V
- Power - Max：40 W
- Frequency - Transition：-
- Operating Temperature：150°C (TJ)
- Mounting Type：Through Hole
- Package / Case：TO-225AA, TO-126-3
- Supplier Device Package：TO-126-3
- Grade：-
- Qualification：-
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Overview
The BD681S is a complementary silicon power Darlington transistor manufactured by Fairchild Semiconductor. It utilizes planar base island technology with a monolithic Darlington configuration and an integrated antiparallel collector-emitter diode. The device offers good hFE linearity and high fT frequency performance. It is available in the SOT-89 surface-mount package, designed for applications requiring robust switching capabilities and high current handling within a compact form factor.
Feature Summary
- Monolithic Darlington configuration with integrated antiparallel collector-emitter diode
- Planar base island technology construction
- Good hFE linearity characteristics
- High fT frequency performance
Applications
- Power switching circuits
- Audio amplifier stages
- Motor control interfaces
Procurement Notes
Verify the manufacturer origin as Fairchild Semiconductor or its successors (onsemi) to ensure authenticity. Confirm the SOT-89 package marking matches official datasheet specifications. Check for RoHS compliance status if required for specific manufacturing environments. Ensure the part number suffix 'S' correctly denotes the surface-mount variant.
Selection Notes
Select this component when a surface-mount Darlington pair is required for medium-power applications. Consider the thermal resistance of the SOT-89 package for heat dissipation requirements. Evaluate the need for the integrated antiparallel diode for inductive load protection. Compare pinout compatibility with existing PCB layouts against alternative packages like TO-126.
Part Context
The BD681 series includes complementary NPN and PNP variants, such as the BD680 and BD681, forming a matched pair for push-pull configurations. The 'S' suffix specifically identifies the surface-mount SOT-89 version, distinguishing it from through-hole options like the TO-126 package used in standard BD681 parts.
FAQ
Does the BD681S include an internal freewheeling diode?
Yes, the device features a monolithic Darlington configuration with an integrated antiparallel collector-emitter diode.
What packaging does the BD681S use?
The BD681S is housed in an SOT-89 surface-mount package.
