Product Overview
Sprague ULN2804A 8-Channel NPN Darlington Transistor Array DIP-18
Condition
Used equipment pull. Markings legible: ULN2804A, Sprague logo, date code 8514. Evaluation: Visual inspection only. Function testing not performed. Verify suitability before use.
Same or next business day shipping from our Idaho warehouse. Reliable parts since 1999. Honest pricing, no nonsense.
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Product Overview
The Sprague ULN2804A is an eight-channel NPN Darlington transistor array in an 18-pin dual in-line package (DIP-18). Designed for interfacing high-voltage, high-current loads directly to 6V to 15V CMOS and PMOS logic levels, each driver channel features an internal 10.5 kΩ input resistor and integrated transient suppression clamp diodes for inductive load switching.
Key Features
- 8-channel NPN Darlington transistor configuration
- 50 V maximum output breakdown voltage
- 500 mA continuous collector current rating per channel (600 mA peak)
- Internal 10.5 kΩ base series resistors optimized for 6V to 15V CMOS and PMOS logic inputs
- Integrated flyback suppression diodes for switching relays, solenoids, and stepper motors
- Outputs can be paralleled for higher current capability
- 18-pin through-hole DIP package
Applications
- Driving electromechanical relays, DC solenoids, and small DC motors from legacy CMOS logic boards
- Operating unipolar stepper motor coils in custom automation or robotics projects
- Controlling incandescent indicator lamps and LED arrays in retro computing repairs and maker builds
- Replacing obsolete through-hole driver ICs in vintage industrial controllers and arcade hardware
Frequently Asked Questions
What logic families can directly drive the ULN2804A?
The ULN2804A features 10.5 kΩ input resistors specifically scaled for direct operation with 6V to 15V CMOS and PMOS logic circuits.
Are external clamp diodes required when switching inductive loads?
No. The IC includes internal common-cathode suppression diodes on each channel designed to handle inductive voltage spikes when connected to the supply voltage.
Why buy a single pulled vintage IC instead of sourcing a modern reel?
When restoring or repairing legacy equipment that requires period-correct through-hole DIP-18 silicon, sourcing an individual original Sprague unit saves you from buying unnecessary bulk quantities. Flat-rate shipping is $8, orders over $28 ship free, and parts ship from our Idaho warehouse the same or next business day.
Eight Darlington pairs ready to bridge low-power logic to real-world mechanical loads. Plug it into the socket, route your coil lines, and put classic iron back into motion.
Shipping? $8 flat rate, free once your order passes $28 - and it leaves the Idaho warehouse the same or next business day.
