ULN2804A STMicroelectronics Integrated Circuit (Dual-In-Line Packages) In Stock
STMicroelectronics ULN2804A is an 8-channel Darlington transistor array with open-collector outputs rated at 50 V and 500 mA per channel, housed in an 18-pin DIP package. It includes built-in transient suppression diodes on each output for direct relay, solenoid, and motor driver applications without external flyback diodes. Available in stock worldwide with fast shipping for industrial automation, consumer appliances, and LED matrix driving.
- Manufacturer
- STMicroelectronics
- Package
- Dual-In-Line Packages
- Pin Count
- 18
- Lifecycle
- ACTIVE
- Datasheet
- ULN2804A Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.8750(MOQ 4)
- Temp Range
- -20.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of ULN2804A?
- 8-channel open-collector Darlington array with 500 mA per channel and 50 V output rating for driving relays, solenoids, and stepper motors directly from logic signals
- Integrated transient suppression diodes on every output channel eliminate external flyback protection components, simplifying PCB design and reducing BOM
- CMOS and TTL-compatible inputs with input resistors allowing direct interfacing to 5 V logic without additional current-limiting resistors
What is ULN2804A used for?
The ULN2804A is extensively used in industrial PLC output modules, relay driver boards, and stepper motor controllers where up to 8 independent 500 mA sink channels are required from a single 18-pin DIP IC. Its integrated flyback diodes make it the go-to solution for driving inductive loads such as solenoids and latching relays in home automation and white goods appliances. LED matrix display driving and lamp switching circuits also leverage the ULN2804A open-collector outputs for multiplexed high-current display segments.
What are the specifications of ULN2804A?
| Factory Lead Time | 10Weeks |
| YTEOL | 5.5 |
| Built-in Protections | TRANSIENT |
| Driver Number of Bits | 8 |
| Interface IC Type | BUFFER OR INVERTER BASED PERIPHERAL DRIVER |
| JESD-30 Code | R-PDIP-T18 |
| Number of Functions | 1 |
| Output Characteristics | OPEN-COLLECTOR |
| Output Current Flow Direction | SINK |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP18,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Surface Mount | NO |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Turn-off Time | 1 µs |
| Turn-on Time | 1 µs |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mainland China, Malaysia |
Where can I find the ULN2804A datasheet?
ULN2804A Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for ULN2804A?
Compatible alternatives and drop-in replacements for ULN2804A:
Frequently Asked Questions
How many output channels does the ULN2804A provide and what is the maximum current per channel?
The ULN2804A integrates 8 independent Darlington transistor channels, each capable of sinking up to 500 mA at voltages up to 50 V, making it capable of driving 8 relay coils or solenoids simultaneously from a single 18-pin package.
Do I need external flyback diodes when driving inductive loads with the ULN2804A?
No; the ULN2804A includes built-in transient suppression diodes connected between each output and a common cathode pin (COM), which clamp inductive kickback spikes when switching relay coils, solenoids, or stepper motor windings rated up to 50 V.
Which logic families can directly interface to the ULN2804A inputs without additional components?
The ULN2804A accepts CMOS and TTL-level inputs; its input resistors are sized for 5 V logic, so outputs from standard 74HC, 74HCT, and 5 V microcontroller GPIO pins drive the Darlington bases without external current-limiting resistors, simplifying interface design.
How does the ULN2804A differ from ULN2803A and which should be chosen for a 5 V CMOS design?
The ULN2804A includes 10.5 kΩ input resistors optimized for CMOS logic at 5 V supply, while the ULN2803A uses 2.7 kΩ resistors suited for TTL; for a 5 V CMOS microcontroller driving relay coils at up to 500 mA, the ULN2804A is the preferred 8-channel choice.
Related Guides
CSD87313DMS Synchronous Buck Power Stage Design Guide
Design a compact CSD87313DMS synchronous buck stage with practical guidance for loss, gate drive, PCB layout, EMI, thermal validation, and sourcing.
Aug 6, 2026
STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection
Choose STEF05SGR for 5 V overcurrent protection by checking current-limit margin, inrush, thermal loss, fault response, and sourcing.
Aug 6, 2026
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 2026
Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 4+ | $0.9169 | $3.67 |
| 8+ | $0.9002 | $7.20 |
| 16+ | $0.8842 | $14.15 |
| 2000+ | $0.8750 | $1750.00 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“FindMyChip sourced our entire STM32 BOM in 48 hours when our usual distributor had 16-week lead times.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit