ULN2803CDWR Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
ULN2803CDWR is an 8-channel Darlington transistor array peripheral driver by Texas Instruments with open-collector outputs and integrated transient suppression diodes. Key specs: 8 outputs, 500 mA per channel, 20-pin SOIC package. From stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- ULN2803CDWR Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.4103(MOQ 10)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8 independent open-collector Darlington outputs each rated for 500 mA to drive relays, solenoids, and stepper motors
- Integrated transient suppression diodes on all outputs for protection against inductive flyback voltage spikes
- 20-pin SOIC package with standard 5 V input compatibility for direct MCU GPIO interfacing without buffers
Applications
ULN2803CDWR is commonly used in industrial automation for driving relay banks, solenoid valves, and stepper motor coils directly from microcontroller GPIO or logic outputs. Its 8 independent 500 mA Darlington channels allow a single IC to control an 8-relay board or 2-phase stepper motor without external transistor circuits. The integrated flyback diodes and 5 V-compatible inputs make it straightforward to interface with Arduino, PLC output modules, and FPGA I/O expanders in control panel designs.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Built-in Protections | TRANSIENT |
| Driver Number of Bits | 8 |
| Input Characteristics | STANDARD |
| Interface IC Type | BUFFER OR INVERTER BASED PERIPHERAL DRIVER |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Number of Functions | 8 |
| Output Characteristics | OPEN-COLLECTOR |
| Output Current Flow Direction | SINK |
| Output Current-Max | 0.5A |
| Output Peak Current Limit-Nom | 0.5A |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Supply Current-Max | 1.35mA |
| Supply Voltage-Max | 15V |
| Supply Voltage-Min | 6V |
| Supply Voltage-Nom | 3.3V |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Turn-off Time | 1 µs |
| Turn-on Time | 1 µs |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the per-channel output current rating of ULN2803CDWR and how many loads can it drive simultaneously?
Each of ULN2803CDWR's 8 output channels is rated for up to 500 mA continuous current, allowing simultaneous switching of eight loads such as 12 V relays, LED arrays, or solenoids. Total package power dissipation limits apply, so sustained full-current operation across all 8 channels requires thermal consideration to stay below the 2.0 W package limit in a 20-pin SOIC body.
Why does ULN2803CDWR include built-in diodes and which loads benefit most from this feature?
ULN2803CDWR integrates suppression diodes on every output channel to clamp inductive flyback voltage spikes generated when relay coils, solenoids, or motor windings are de-energized. Without these diodes, transient voltages can exceed 100 V and damage the driver IC and other nearby components. The built-in protection eliminates the need for 8 external flyback diodes, simplifying BOM and reducing PCB area for relay-driving applications.
How does ULN2803CDWR interface with 3.3 V microcontroller GPIO outputs without level shifting?
ULN2803CDWR accepts input voltages as low as 1.0 V as a logic high when using the CMOS input variant, and the standard version handles 3.3 V inputs reliably with the series base resistors already integrated in each Darlington input stage. This eliminates the need for external level shifters between 3.3 V MCU GPIO and the driver inputs, reducing BOM by 1 to 2 components per channel in embedded relay control boards.
When would a designer use ULN2803CDWR instead of discrete NPN transistors for driving 8 relay channels?
Using ULN2803CDWR replaces 8 discrete NPN transistors plus 8 base resistors and 8 flyback diodes—up to 24 through-hole or SMD components—with a single 20-pin SOIC, cutting BOM count by over 70% and reducing PCB area by approximately 4 cm². This consolidation also improves reliability by eliminating 24 individual solder joints, making ULN2803CDWR the preferred solution for relay-heavy control boards in industrial automation.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 10+ | $0.7600 | $7.60 |
| 25+ | $0.6800 | $17.00 |
| 100+ | $0.5690 | $56.90 |
| 425+ | $0.4734 | $201.19 |
| 550+ | $0.4577 | $251.73 |
| 735+ | $0.4103 | $301.57 |
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