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STMicroelectronics ULN2804A — Memory (DRAM / SRAM / Flash / EEPROM)
STMicroelectronics

ULN2804A 8 NPN Darlington Array, 50V 0.5A, 18-DIP

MPNULN2804A
End of Life

STMicroelectronics ULN2804A, 8 NPN Darlington transistor array, 50V Vce breakdown, 500mA collector current per channel, 2.25W power dissipation, 18-DIP through-hole package.

$2.84Ref. price · indicative, final on quote
ULN2804A datasheet
Packaging18-DIP (0.300", 7.62mm)
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
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Specifications

ULN2804A Technical Specifications
ParameterValue
Mounting typeThrough Hole
FET type8 NPN Darlington
Voltage - collector emitter breakdown50V
Current - collector (Ic)500mA
DC current gain (hFE) (Min) @ ic, vce1000 @ 350mA, 2V
Power - max2.25W
Operating temperature-20°C ~ 150°C (TJ)
PackageTube
Case18-DIP (0.300\", 7.62mm)
Vce saturation (Max) @ ib, ic1.6V @ 500µA, 350mA

Product details

Eight Darlington pairs in a single 18-DIP — what it means for your panel

The ULN2804A packs eight NPN Darlington pairs into a through-hole 18-DIP package, each rated for 500 mA collector current and a 50 V collector-emitter breakdown. The 18-DIP footprint is a standard 0.300-inch row spacing, so it drops into existing sockets or plated-through holes on legacy control boards. Operating junction temperature spans -20 °C to 150 °C, adequate for industrial enclosures and outdoor cabinets where ambient heat is a factor.

How it compares to the ULN2802A

The ULN2802A shares the same 8 NPN Darlington array, 18-DIP package, 50 V breakdown, 500 mA per channel, and 2.25 W power rating.

Frequently asked questions

What is the pinout of ULN2804A?

The ULN2804A uses the standard 18-DIP pinout for the ULN2800 series: pins 1–8 are the Darlington inputs (base), pins 11–18 are the corresponding outputs (collector), pin 9 is common ground for the emitter, and pin 10 is the common free-wheeling diode cathode for inductive load suppression.

How much current can ULN2804A sink?

Each of the eight channels can sink up to 500 mA continuous collector current. Total package dissipation is limited to 2.25 W, so when driving all channels near the 500 mA limit, derate for duty cycle and ambient temperature.

What is the difference between ULN2803 and ULN2804?

The ULN2803 is designed for TTL logic input thresholds (typically 2.4 V high), while the ULN2804 is designed for CMOS logic (typically 5 V to 12 V high). Both are 8-channel 50 V 500 mA Darlington arrays in the same pinout. If your control signal is 5 V CMOS, the ULN2804A is the correct match.