ULN2003AD - 7-Channel Darlington Driver | Texas Instruments
Référence : ULN2003AD ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 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 Présentation
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.
Alternatives de remplacement direct pour ULN2003AD — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ULN2003AD (même facteur de forme et même empreinte) — différant par Operating Temperature Range, Mounting Type, Package, RoHS Status, Clamp Diodes.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ULN2003ADR
✓ En stock
$0.16 / unité
Voir la fiche technique →ULN2003ADRG4
📋 Alternative de référence (hors catalogue)
ULN2003ADRE4
📋 Alternative de référence (hors catalogue)
ULN2003AD Valeurs maximales et caractéristiques électriques
| 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) |
| Plage de température de fonctionnement | -40°C to +105°C |
| Boîtier | SOIC-16 (D) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
| Logic Compatibility | TTL, 5V CMOS |
| Type de sortie | Open Collector |
Configuration des broches de ULN2003AD
| Broche 1 | IN1 — Input channel 1 |
| Broche 2 | IN2 — Input channel 2 |
| Broche 3 | IN3 — Input channel 3 |
| Broche 4 | IN4 — Input channel 4 |
| Broche 5 | IN5 — Input channel 5 |
| Broche 6 | IN6 — Input channel 6 |
| Broche 7 | IN7 — Input channel 7 |
| Broche 8 | GND — Ground |
| Broche 9 | COM — Common cathode for clamp diodes |
| Broche 10 | OUT7 — Output channel 7 |
| Broche 11 | OUT6 — Output channel 6 |
| Broche 12 | OUT5 — Output channel 5 |
| Broche 13 | OUT4 — Output channel 4 |
| Broche 14 | OUT3 — Output channel 3 |
| Broche 15 | OUT2 — Output channel 2 |
| Broche 16 | OUT1 — Output channel 1 |
Applications typiques
ULN2003AD convient pour 6 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ULN2003AD — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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 |
Principaux différenciateurs
- Same SOIC-16 package with tape and reel packaging (vs ULN2003AN (DIP-16))
- Identical electrical specifications to ULN2003ADR (vs ULN2003ADR)
- RoHS compliant and lead-free (vs ULN2003AN (DIP-16))
Notes de conception
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.
Informations de conformité
RoHS compliant per TI product page. Not AEC-Q100 qualified - choose ULN2003ADR-Q1 for automotive.
