ULN2003AD - 7-Channel Darlington Driver | Texas Instruments
料号： ULN2003AD ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.1445 | $0.14 |
| 10 | $0.1044 | $1.04 |
| 100 | $0.0923 | $9.23 |
| 500 | $0.0883 | $44.15 |
| 1,000 | $0.0843 | $84.30 |
ULN2003AD 概述
A Darlington transistor array is a semiconductor device that integrates multiple Darlington pairs, each consisting of two bipolar transistors in a configuration that provides high current gain. This category falls under the hierarchy: Darlington array -> transistor array -> discrete semiconductor -> semiconductor. The ULN2003A is a specific variant of the ULN2003 family, which is widely used in industrial and consumer applications for interfacing low-level logic signals to high-current loads.
Key features include seven Darlington pairs with a total current capability of 500 mA per channel, a collector-emitter voltage rating of 50 V, and integrated clamp diodes for inductive load protection. The input is compatible with TTL and 5V CMOS logic, and the device includes a common emitter for all channels. The SOIC-16 package provides a compact footprint for space-constrained designs.
The ULN2003AD uses a bipolar process technology with a high-current NPN Darlington configuration. Each channel has a base resistor (2.7 kΩ) and an emitter resistor (3.6 kΩ) to ensure proper biasing and thermal stability. The integrated clamp diodes are connected to a common cathode pin (pin 9) for easy connection to the supply rail. The device exhibits a low saturation voltage (typically 1.6 V at 350 mA) to minimize power dissipation.
Typical applications include relay drivers, stepper motor drivers, solenoid drivers, and lamp drivers in industrial control, automotive, and consumer electronics. The high current gain allows direct interfacing with microcontrollers without additional driver stages, simplifying circuit design.
When designing with this device, ensure that the total power dissipation does not exceed the package thermal limits. For high-current applications, consider using multiple channels in parallel or adding external heatsinking. The clamp diodes must be connected to the positive supply rail to protect against inductive kickback.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the TI datasheet, providing a comprehensive resource for engineers selecting the ULN2003AD.
直接替换替代料： ULN2003AD ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ULN2003AD （相同外形与封装尺寸） ——差异在于 Operating Temperature Range, Mounting Type, Package, RoHS Status, Clamp Diodes.
快速对比工具——选择替代料号进行并排对比：
ULN2003ADR
✓ 有现货
$0.16 / 个
查看数据手册 →ULN2003ADRG4
📋 参考替代料（不在目录中）
ULN2003ADRE4
📋 参考替代料（不在目录中）
ULN2003AD 最大额定值与电气特性
| Number of Channels | 7 |
| Collector-Emitter Voltage (VCE) | 50 V |
| Collector Current (IC) per Channel | 500 mA (continuous), 600 mA (peak) |
| Input Voltage (VIN) | 30 V (max) |
| Base Current (IB) | 25 mA (max) |
| Saturation Voltage (VCE(sat)) | 1.6 V (typical at IC=350 mA) |
| Clamp Diode Reverse Voltage | 50 V |
| Clamp Diode Forward Current | 500 mA |
| Input Resistance | 2.7 kΩ (base), 3.6 kΩ (emitter) |
| 工作温度范围 | -40°C to +105°C |
| 封装 | SOIC-16 (D) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Logic Compatibility | TTL, 5V CMOS |
| 输出类型 | Open Collector |
ULN2003AD 引脚配置
| 引脚 1 | IN1 — Input channel 1 |
| 引脚 2 | IN2 — Input channel 2 |
| 引脚 3 | IN3 — Input channel 3 |
| 引脚 4 | IN4 — Input channel 4 |
| 引脚 5 | IN5 — Input channel 5 |
| 引脚 6 | IN6 — Input channel 6 |
| 引脚 7 | IN7 — Input channel 7 |
| 引脚 8 | GND — Ground |
| 引脚 9 | COM — Common cathode for clamp diodes |
| 引脚 10 | OUT7 — Output channel 7 |
| 引脚 11 | OUT6 — Output channel 6 |
| 引脚 12 | OUT5 — Output channel 5 |
| 引脚 13 | OUT4 — Output channel 4 |
| 引脚 14 | OUT3 — Output channel 3 |
| 引脚 15 | OUT2 — Output channel 2 |
| 引脚 16 | OUT1 — Output channel 1 |
典型应用
ULN2003AD 适用于 6 应用s: Relay Driver, Stepper Motor Driver, Solenoid Driver, Lamp Driver, Industrial Control, Consumer Electronics.
Relay Driver
The ULN2003AD is ideal for driving relays in industrial control and home automation systems. Each channel can sink up to 500 mA, sufficient for most small and medium relays. The built-in clamp diodes protect the driver from inductive kickback when the relay coil is de-energized. In a typical application, the relay coil is connected between the positive supply and the output pin, with the COM pin tied to the same supply. The input is driven by a microcontroller or logic gate, and the Darlington pair provides high current gain, allowing direct interfacing without additional transistors. The low saturation voltage (1.6 V at 350 mA) minimizes power dissipation, and the 50 V collector-emitter rating supports 12V and 24V relay coils. For multiple relays, the seven channels can drive up to seven relays, simplifying PCB layout and reducing component count. The device's thermal performance is adequate for continuous operation at moderate currents, but for high-duty-cycle applications, ensure the total power dissipation is within the package limits.
推荐
Stepper Motor Driver
The ULN2003AD is widely used to drive unipolar stepper motors in 3D printers, CNC machines, and robotics. Each motor phase is connected to one of the seven channels, with the common center tap connected to the positive supply. The Darlington array provides the high current required by stepper motor coils, typically 300-500 mA per phase. The built-in clamp diodes are essential for suppressing the inductive spikes generated when the phase is switched off, preventing damage to the driver. The input can be driven directly by a stepper motor controller IC or a microcontroller with a simple transistor interface. The 50 V collector-emitter rating allows operation with 12V or 24V motors. The low saturation voltage reduces power loss in the driver, improving efficiency. For bipolar stepper motors, an H-bridge driver is required, but the ULN2003AD is specifically suited for unipolar configurations. The device's seven channels allow driving a 4-phase motor with three channels to spare for other functions.
推荐
Solenoid Driver
The ULN2003AD is suitable for driving solenoids in vending machines, door locks, and industrial automation. Solenoids typically require a high current pulse to actuate, and the ULN2003AD can provide up to 500 mA per channel. The integrated clamp diodes protect the driver from the high-voltage spike generated when the solenoid is de-energized. In a typical application, the solenoid is connected between the positive supply and the output pin, with the COM pin tied to the supply. The input is driven by a PLC or microcontroller. The 50 V collector-emitter rating supports 12V and 24V solenoids. The device's high current gain allows direct interfacing with low-current logic outputs. For solenoids requiring more than 500 mA, two channels can be paralleled to increase current capability. The thermal performance is adequate for intermittent operation, but for continuous duty, consider the power dissipation and add heatsinking if necessary.
推荐
Lamp Driver
The ULN2003AD can drive incandescent lamps and LED arrays in automotive and industrial applications. Each channel can sink up to 500 mA, sufficient for small lamps and LED strips. The open-collector output allows the lamp to be connected between the positive supply and the output pin. The built-in clamp diodes are not required for resistive loads but are present for inductive loads. The input is compatible with TTL and 5V CMOS logic, making it easy to interface with microcontrollers. The 50 V collector-emitter rating supports 12V and 24V lamp systems. The low saturation voltage minimizes power dissipation in the driver, improving efficiency. For LED arrays, a current-limiting resistor is required in series with each LED string. The device's seven channels can drive up to seven lamps or LED strings, simplifying the driver circuit. The thermal performance is adequate for moderate currents, but for high-current lamps, ensure the total power dissipation is within the package limits.
推荐
Industrial Control
The ULN2003AD is used in industrial control systems for interfacing logic-level signals to high-current actuators such as contactors, valves, and motors. The device provides a robust interface between PLCs or microcontrollers and industrial loads. The 50 V collector-emitter rating and 500 mA current capability are suitable for many industrial loads. The built-in clamp diodes protect against inductive transients from contactor coils and motor windings. The input is compatible with TTL and 5V CMOS logic, allowing direct connection to PLC output modules. The SOIC-16 package is compact and suitable for PCB mounting in control cabinets. The device's seven channels allow driving multiple actuators from a single IC, reducing component count and PCB area. The operating temperature range of -40°C to +105°C ensures reliable operation in harsh industrial environments. For high-reliability applications, consider the automotive-grade variant ULN2003ADR-Q1.
推荐
Consumer Electronics
The ULN2003AD is used in consumer electronics for driving small motors, relays, and LEDs in appliances, toys, and gaming peripherals. The device's low cost and ease of use make it popular in hobbyist and DIY projects. The 500 mA current capability is sufficient for small DC motors and relays. The built-in clamp diodes protect against inductive spikes from motors. The input is compatible with 5V logic from microcontrollers like Arduino. The SOIC-16 package is suitable for compact PCB designs. The device's seven channels allow driving multiple loads from a single IC. The low saturation voltage minimizes power dissipation, extending battery life in portable devices. The operating temperature range is suitable for consumer environments. For applications requiring higher current, the ULN2803A (8 channels, 500 mA) or ULN2004A (higher input voltage) can be considered.
推荐
推荐产品汇总
工程参考数据： ULN2003AD ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ULN2003ADR | ULN2003ADRG4 | ULN2003ADRE4 |
|---|---|---|---|---|
| Package | SOIC-16 (D) | SOIC-16 (D) - same | SOIC-16 (D) - same | SOIC-16 (D) - same |
| Number of Channels | 7 | 7 | 7 | 7 |
| Collector-Emitter Voltage | 50 V | 50 V | 50 V | 50 V |
| Collector Current per Channel | 500 mA | 500 mA | 500 mA | 500 mA |
| Saturation Voltage | 1.6 V (typical) | 1.6 V (typical) | 1.6 V (typical) | 1.6 V (typical) |
| Clamp Diodes | Yes | Yes | Yes | Yes |
| RoHS Compliant | Yes | Yes | Yes | Yes |
| Automotive Grade | No | No | No | No |
关键差异点
- Same SOIC-16 package with tape and reel packaging （对比 ULN2003AN (DIP-16))
- Identical electrical specifications to ULN2003ADR （对比 ULN2003ADR)
- RoHS compliant and lead-free （对比 ULN2003AN (DIP-16))
设计说明
The ULN2003AD can dissipate significant power when driving multiple channels at high current. For example, driving 7 channels at 500 mA with a saturation voltage of 1.6 V results in a total power dissipation of 5.6 W. The SOIC-16 package has a thermal resistance of approximately 73°C/W (theta_JA), so the junction temperature rise would be 409°C above ambient, which is unacceptable. Ensure adequate PCB copper area or use a heatsink for high-current applications. For continuous operation, keep the total power dissipation below 1 W per package.
Place the COM pin (pin 9) connection to the positive supply rail with a low-impedance trace, as it carries the clamp diode current during inductive switching. Use a 0.1 µF decoupling capacitor near the VCC pin of the load supply to suppress transients. For high-current outputs, use wide traces or copper pours to minimize voltage drop and heat generation. Ensure the GND pin (pin 8) has a solid connection to the ground plane.
Do not forget to connect the COM pin (pin 9) to the positive supply rail when driving inductive loads. If left floating, the clamp diodes will not function, and the inductive kickback can damage the output transistors. Also, ensure the input voltage does not exceed 30 V, and the collector-emitter voltage does not exceed 50 V. For 3.3V logic, use a level shifter or a Darlington array with lower input threshold, as the ULN2003AD is designed for 5V TTL logic.
合规信息
RoHS compliant per TI product page. Not AEC-Q100 qualified - choose ULN2003ADR-Q1 for automotive.
