ULN2803ADWR - 8ch 50V 500mA Darlington Array | TI
MPN: ULN2803ADWR β Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.85 | $0.85 |
| 10 | $0.72 | $7.20 |
| 100 | $0.58 | $58.00 |
| 500 | $0.49 | $245.00 |
| 1,000 | $0.42 | $420.00 |
Drop-in alternatives for ULN2803ADWR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ULN2803ADW
β Drop-Inπ Reference alternative (not in catalog)
ULN2803ADWRG4
β Drop-Inπ Reference alternative (not in catalog)
ULN2803AG
β Drop-Inπ Reference alternative (not in catalog)
ULN2804ADWR
β Drop-Inπ Reference alternative (not in catalog)
ULN2803ADWR Maximum Ratings & Electrical Characteristics
| Number of Channels | 8 |
| Collector-Emitter Voltage (VCEO) | 50 V |
| Collector Current (IC) per Channel | 500 mA |
| Input Voltage (VI) | 30 V |
| Input Current (II) per Channel | 25 mA |
| Clamp Diode Reverse Voltage | 50 V |
| Clamp Diode Forward Current | 500 mA |
| Package | 18-SOIC (DW) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40Β°C to +85Β°C |
| Power Dissipation (PD) | 1.4 W |
| Thermal Resistance (ΞΈJA) | 73.2 Β°C/W |
| Input Compatibility | TTL, 5V CMOS |
| RoHS Status | Compliant |
| Lifecycle Status | Last Time Buy (LTB) |
ULN2803ADWR Pin Configuration
| Pin 1 | IN1 β Input for channel 1 |
| Pin 2 | IN2 β Input for channel 2 |
| Pin 3 | IN3 β Input for channel 3 |
| Pin 4 | IN4 β Input for channel 4 |
| Pin 5 | IN5 β Input for channel 5 |
| Pin 6 | IN6 β Input for channel 6 |
| Pin 7 | IN7 β Input for channel 7 |
| Pin 8 | IN8 β Input for channel 8 |
| Pin 9 | GND β Ground |
| Pin 10 | OUT8 β Output for channel 8 |
| Pin 11 | OUT7 β Output for channel 7 |
| Pin 12 | OUT6 β Output for channel 6 |
| Pin 13 | OUT5 β Output for channel 5 |
| Pin 14 | OUT4 β Output for channel 4 |
| Pin 15 | OUT3 β Output for channel 3 |
| Pin 16 | OUT2 β Output for channel 2 |
| Pin 17 | OUT1 β Output for channel 1 |
| Pin 18 | COM β Common cathode for clamp diodes |
ULN2803ADWR Power Derating Curve
ULN2803ADWR Power Derating Curve
Typical Applications
ULN2803ADWR is suitable for 6 applications: Relay Driver, Stepper Motor Driver, Solenoid Driver, LED Display Driver, Logic-to-Power Interface, Automotive Load Driver.
Relay Driver
The ULN2803ADWR is ideal for driving relays in industrial control and automation. Each channel can sink up to 500mA, sufficient for most small relays. The built-in clamp diodes protect against back-EMF, eliminating the need for external diodes. Connect the COM pin to the relay supply voltage to enable the clamp diodes. This simplifies PCB design and reduces component count. The TTL-compatible inputs allow direct connection to microcontrollers or PLC outputs. With 8 channels, it can drive multiple relays in a compact SOIC package, saving board space. The 50V rating ensures compatibility with 12V and 24V relay coils. For higher current relays, consider using multiple channels in parallel or a dedicated relay driver IC.
Recommended
Stepper Motor Driver
The ULN2803ADWR is commonly used to drive unipolar stepper motors in 3D printers, CNC machines, and robotics. Each motor phase can be connected to one channel, and the clamp diodes handle inductive kickback. The 500mA per channel rating is suitable for small to medium stepper motors. The 8-channel configuration allows driving two 4-phase stepper motors or one 8-wire motor. The TTL-compatible inputs simplify interfacing with stepper motor controllers. The SOIC package is compact, making it suitable for space-constrained designs. For higher current motors, consider using a dedicated stepper driver IC like the DRV8825. The ULN2803ADWR provides a cost-effective solution for low-power stepper applications.
Recommended
Solenoid Driver
The ULN2803ADWR is well-suited for driving solenoids in vending machines, door locks, and industrial equipment. Each channel can handle up to 500mA, which is typical for small solenoids. The integral clamp diodes suppress voltage spikes when the solenoid is de-energized, protecting the driver and other circuitry. The 50V rating allows operation with 12V, 24V, or 48V solenoids. The TTL-compatible inputs enable direct control from microcontrollers or logic gates. The 8-channel configuration allows driving multiple solenoids in a single package, reducing board space and cost. For solenoids with higher current requirements, consider using a MOSFET driver or a relay. The ULN2803ADWR is a reliable and cost-effective solution for solenoid control.
Recommended
LED Display Driver
The ULN2803ADWR is widely used to drive LED displays, including 7-segment and dot-matrix displays. Each channel can sink up to 500mA, which is more than sufficient for LED segments. The TTL-compatible inputs allow direct connection to microcontrollers or display drivers. The common-cathode configuration is ideal for sinking current from LED anodes. The 8-channel design can drive one 8-digit 7-segment display or multiple smaller displays. The SOIC package is compact, making it suitable for portable devices. The clamp diodes are not needed for LED loads but are harmless. For multiplexed displays, the ULN2803ADWR can be used with a microcontroller to scan digits. This simplifies the drive circuitry and reduces component count.
Recommended
Logic-to-Power Interface
The ULN2803ADWR serves as a bridge between low-voltage logic and high-current loads. It is commonly used in PLCs, industrial controllers, and automotive electronics to drive lamps, buzzers, and small motors. The TTL-compatible inputs allow direct connection to 5V logic, while the outputs can switch up to 50V and 500mA. The integral clamp diodes protect against inductive loads. The 8-channel configuration provides a compact solution for multiple outputs. The SOIC package is suitable for automated assembly. The device is also used in relay logic replacement, where it can replace discrete transistor circuits. Its high current gain eliminates the need for additional driver stages. This makes it a versatile component for many interfacing applications.
Recommended
Automotive Load Driver
The ULN2803ADWR is used in automotive applications to drive loads such as relays, solenoids, and indicator lamps. It is qualified for automotive temperature ranges (-40Β°C to +85Β°C) and is available in AEC-Q100 versions. The 50V rating is suitable for 12V and 24V automotive systems. The clamp diodes protect against voltage spikes from inductive loads. The TTL-compatible inputs allow direct connection to automotive microcontrollers. The 8-channel configuration is useful for driving multiple loads in body control modules. The SOIC package is compact and suitable for automotive PCBs. For higher current loads, consider using a smart power switch like the TPS2HC08-Q1. The ULN2803ADWR provides a cost-effective solution for low-current automotive loads.
Recommended
Recommended Products Summary
Engineering reference data for ULN2803ADWR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ULN2803ADW | ULN2803ADWRG4 | ULN2803AG | ULN2803CDWR |
|---|---|---|---|---|---|
| Package | 18-SOIC (DW) | 18-SOIC (DW) | 18-SOIC (DW) | 18-SOIC (DW) | 20-SOIC (DW) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Toshiba | Texas Instruments |
| Number of Channels | 8 | 8 | 8 | 8 | 8 |
| Collector-Emitter Voltage | 50 V | 50 V | 50 V | 50 V | 50 V |
| Collector Current per Channel | 500 mA | 500 mA | 500 mA | 500 mA | 500 mA |
| Input Voltage Range | 30 V | 30 V | 30 V | 30 V | 30 V |
| Clamp Diodes | Yes | Yes | Yes | Yes | Yes |
| Lifecycle Status | Last Time Buy | Active | Active | Active | Active |
Key Differentiators
- Integral clamp diodes for inductive loads (vs Discrete transistor arrays without clamp diodes)
- TTL-compatible inputs (vs ULN2804A (higher input voltage))
- 8 channels in a compact SOIC package (vs ULN2003A (16-pin DIP))
Design Notes
The ULN2803ADWR can dissipate up to 1.4W at 25Β°C ambient. When driving multiple channels at high current, calculate the total power dissipation as the sum of VCE(sat) * IC for each channel. For example, at 500mA and VCE(sat) of 1.6V, each channel dissipates 0.8W. With 8 channels, this exceeds the package limit, so derating is necessary. Use adequate PCB copper area and consider thermal vias to improve heat dissipation.
Place the COM pin connection to the load supply voltage close to the device to minimize loop area and reduce EMI. Use a 0.1uF decoupling capacitor near the VCC pin if used. For inductive loads, ensure the clamp diode path is short and low-inductance. The SOIC package has a thermal pad on the bottom; connect it to a large copper pour for better thermal performance.
Do not exceed the maximum collector current of 500mA per channel. When driving inductive loads, always connect the COM pin to the positive supply of the load; otherwise, the clamp diodes are disabled and the device may be damaged by back-EMF. Also, ensure the input voltage does not exceed 30V. For TTL inputs, the input current is limited to 25mA, so no external resistors are needed for 5V logic.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified; automotive versions may be available under different part numbers.
