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Product Detailed Parameters
- Description：TRANS 4NPN DARL 80V 4A 12SIP
- Series：-
- Mfr：Allegro MicroSystems
- Package：Bulk
- Transistor Type：4 NPN Darlington (Quad)
- Current - Collector (Ic) (Max)：4A
- Voltage - Collector Emitter Breakdown (Max)：80V
- Vce Saturation (Max) @ Ib, Ic：-
- Current - Collector Cutoff (Max)：100µA
- DC Current Gain (hFE) (Min) @ Ic, Vce：-
- Power - Max：-
- Frequency - Transition：-
- Operating Temperature：-20°C ~ 85°C (TA)
- Mounting Type：Through Hole
- Package / Case：12-SIP Exposed Tab
- Supplier Device Package：12-SIP
- Grade：-
- Qualification：-
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Overview
The UDN2879W-2 is a quad high-current Darlington switch array manufactured by Allegro MicroSystems. It features four independent NPN Darlington pairs housed in a 12-SIP package. The device supports a maximum output current of 4A per channel and operates with a supply voltage up to 80V. Designed for interfacing low-level logic with peripheral power devices, it includes built-in flyback diodes for inductive load protection. The component is classified as obsolete or not recommended for new designs.
Feature Summary
- Integrates four independent high-current Darlington transistor pairs within a single package
- Includes integrated flyback diodes to protect against inductive kickback from loads
- Designed for direct interface between low-voltage logic circuits and high-power peripherals
Applications
- Driving solenoids and valves
- Controlling small DC motors
- Relay driver circuits
- Lamp and lighting control systems
Procurement Notes
Verify the current lifecycle status before procurement, as this part may be marked as obsolete or not recommended for new designs. Confirm availability through authorized distributors or surplus suppliers. Ensure that the 12-SIP package dimensions and pinout match the target PCB footprint. Validate that the 80V/4A ratings meet the specific application requirements without exceeding absolute maximum ratings.
Selection Notes
Select this component when a compact solution for driving multiple inductive loads is required. It is suitable for applications needing high current switching capability with minimal external components due to integrated protection diodes. Consider the thermal performance of the SIP package under continuous load conditions. Evaluate alternative modern equivalents if long-term supply stability is a critical project requirement.
Part Context
This component belongs to the UDN series of Darlington arrays produced by Allegro MicroSystems. These devices are engineered to bridge the gap between microcontroller outputs and heavy-duty actuators. The UDN2879W-2 specifically offers a quad configuration, providing four channels of amplification and switching in a single through-hole package, simplifying board layout for multi-load systems.
Replacement Considerations
Public confirmed substitute part numbers are not available in the provided documentation. As the part is listed as obsolete, engineers should consult Allegro MicroSystems for recommended modern replacements or evaluate generic quad Darlington arrays with compatible voltage and current ratings.
