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Product Detailed Parameters
- Description：TRANS 8NPN DARL 50V 500MA 18DIP
- Series：-
- Mfr：STMicroelectronics
- Package：Tube
- Transistor Type：8 NPN Darlington
- Current - Collector (Ic) (Max)：500mA
- Voltage - Collector Emitter Breakdown (Max)：50V
- Vce Saturation (Max) @ Ib, Ic：1.6V @ 500µA, 350mA
- Current - Collector Cutoff (Max)：-
- DC Current Gain (hFE) (Min) @ Ic, Vce：1000 @ 350mA, 2V
- Power - Max：2.25W
- Frequency - Transition：-
- Operating Temperature：-20°C ~ 150°C (TJ)
- Mounting Type：Through Hole
- Package / Case：18-DIP (0.300", 7.62mm)
- Supplier Device Package：18-DIP
- Grade：-
- Qualification：-
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Overview
The ULN2801A is an eight-channel NPN Darlington transistor array manufactured by STMicroelectronics. It features a common emitter configuration with integral suppression diodes designed for driving inductive loads. The device provides a peak load current rating of 600 mA per channel and supports a continuous collector current of 500 mA, while withstanding at least 50 V in the OFF state. Each channel includes a current-limiting resistor tailored for general-purpose applications. The component is housed in an 18-lead plastic DIP package with a copper lead form.
Feature Summary
- Integrated suppression diodes for handling inductive load back-EMF
- Built-in current-limiting resistors for simplified logic interfacing
- Input-opposite-output pinout to facilitate printed circuit board layout
Applications
- General-purpose logic interface circuits
- Inductive load switching systems
- Relay driver modules
Procurement Notes
Verify the specific ordering suffix against the manufacturer's official datasheet to confirm package type and temperature range. Ensure compliance with RoHS directives if required for the target assembly. Confirm availability through authorized distribution channels as supply levels fluctuate based on production cycles.
Selection Notes
Select the ULN2801A when general-purpose current limiting is required without external components. Choose this variant over the ULN2803A or ULN2804A if the application does not require specific input resistance values for TTL or CMOS voltage levels. Verify that the 500 mA continuous current rating meets the load requirements.
Part Context
The ULN2801A belongs to the ULN28xxA series of octal Darlington arrays produced by STMicroelectronics. This family shares identical physical packaging and core transistor structures, differing primarily in internal input resistor values to optimize compatibility with various digital logic families such as TTL, CMOS, and PMOS.
Replacement Considerations
The ULN2803A and ULN2804A are direct functional substitutes within the same series. Substitution requires verifying that the input resistor value of the replacement part matches the source impedance and voltage levels of the driving logic circuit.
