ULN2001 3-Channel Darlington Transistor Array IC — SOP-8, 50V 500mA, Flyback Diodes (10-Pack)

ULN2001 3-Channel Darlington Transistor Array IC — SOP-8, 50V / 500mA, Flyback Diodes (10-Pack)

The ULN2001 is a 3-channel NPN Darlington transistor array in SOP-8 package, designed to drive inductive loads such as relays, stepper motor coils, solenoid valves, and LED arrays directly from TTL or CMOS logic outputs. Built-in flyback diodes on each channel protect the IC from inductive voltage spikes, eliminating the need for external protection diodes. This 10-pack is ideal for prototyping stock and production use.

Key Specifications

Parameter	Value
IC	ULN2001 / ULN2001A
Package	SOP-8
Channels	3 (independent NPN Darlington pairs)
Max Collector Voltage	50V
Max Collector Current	500mA per channel
Input Compatibility	TTL and CMOS logic
Flyback Diodes	Built-in (one per channel)
VCE Saturation	~1V (at 350mA)
Operating Temperature	-40°C to +85°C
Pack Quantity	10 pieces

ULN2001 vs ULN2003 vs ULN2803

IC	Channels	Package	Best For
ULN2001	3	SOP-8	Compact 3-channel SMD designs
ULN2003	7	DIP-16 / SOP-16	Stepper motor, 7-segment display
ULN2803	8	DIP-18 / SOP-18	High-channel-count relay arrays

Why Choose ULN2001?

• ✅ SOP-8 package — compact SMD footprint for space-constrained PCBs
• ✅ Built-in flyback diodes — no external protection diodes needed for relay/solenoid driving
• ✅ TTL/CMOS compatible input — directly driven by Arduino, ESP32, STM32 GPIO
• ✅ 500mA per channel — sufficient for small relays and solenoids
• ✅ 10-pack value — ideal for prototyping and production stock

Typical Applications

• Relay driver from Arduino / MCU GPIO
• Stepper motor coil driver (3-phase)
• Solenoid valve driver
• LED array high-current driver
• DC motor driver (low current)

Package Contents

• 10 × ULN2001 SOP-8 Darlington Transistor Array IC

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