My Inquiry
My Account
Texas Instruments ULQ2003ATDRAS
- Part No.:
- ULQ2003ATDRAS
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ULQ2003ATDRAS.pdf
- Description:
- ANALOG AUTOMOTIVE
- Quantity:
- Payment:
- Shipping:
Inventory:1,505
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ULQ2003ATDRAS from Texas Instruments is a high-voltage, high-current Darlington transistor array comprising seven NPN Darlington pairs with 500mA per-channel sink capability, 50V collector-emitter rating, integrated common-cathode clamp diodes, and 2.7kΩ input base resistors optimized for direct TTL/5V CMOS interfacing - widely deployed in automotive relay and solenoid drivers.
For engineers reviewing the ULQ2003ATDRAS datasheet, ULQ2003ATDRAS pinout, ULQ2003ATDRAS application, or ULQ2003ATDRAS equivalent, this page delivers verified electrical specs, validated SOIC-16 pin functions, confirmed automotive-grade thermal and ESD ratings (AEC-Q100 qualified), and real-world design guidance for inductive load switching.
Technical Context
The ULQ2003ATDRAS implements seven independent Darlington stages, each featuring cascaded NPN transistors delivering current gain up to 10,000 A/A, enabling 500mA output sink with sub-1.4mA input drive at 3.85V. Its internal 2.7kΩ series base resistor sets input sensitivity for 3.3V/5V logic compatibility without external biasing.
Each channel includes a dedicated collector clamp diode tied to the COM terminal, allowing safe commutation of inductive loads up to 50V - critical for automotive relays and stepper motor phases. The device operates across –40°C to 105°C (ULQ2003AT grade) and supports parallel outputs for >500mA aggregate current per load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel count | 7 independent Darlington sink outputs - enables multi-load control from single IC, reducing board space vs discrete solutions. |
| Max collector current (per channel) | 500mA - sufficient to drive automotive relays (e.g., 12V/400mA coil) without external amplification. |
| Collector-emitter voltage (VCE) | 50V - supports 24V industrial and 48V automotive supply rails with margin for inductive kickback. |
| VCE(sat) @ IC = 200mA | 1.0–1.4V - low saturation voltage minimizes power loss (≤280mW/channel) and self-heating during continuous conduction. |
| Input resistor value | 2.7kΩ - sets nominal input current of 1.35mA at 3.85V, matching standard TTL/CMOS output drive capability. |
| ESD rating (HBM) | ±2000V - exceeds AEC-Q100-002 requirement, ensuring robustness in automotive assembly and field operation. |
| Operating temperature range | –40°C to 105°C - qualified for under-hood automotive applications per AEC-Q100 Grade 2. |
Pinout & Package
ULQ2003ATDRAS is supplied in a 16-pin SOIC (D) package measuring 9.90mm × 3.90mm, with gull-wing leads and RoHS-compliant NiPdAu plating. Thermal resistance RθJA is 87.9°C/W, supporting up to 494mW dissipation at 85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1B–7B | Input (base) | Seven logic-compatible inputs; each connects internally to 2.7kΩ resistor and Darlington base - accepts 3.3V/5V TTL/CMOS directly. |
| 1C–7C | Output (collector) | Open-collector NPN outputs; sink current to E pin - require external pull-up or COM connection for inductive loads. |
| E | Common emitter | Shared emitter node for all seven Darlingtons; must be connected to system ground or low-side return path. |
| COM | Clamp diode cathode | Common cathode for all seven flyback diodes; ties to inductive load supply rail (e.g., +12V) to suppress voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Automotive-grade reliability certified for temperature cycling, humidity, and mechanical shock - suitable for safety-critical body electronics. |
| Integrated clamp diodes | Seven monolithic Schottky-like diodes tied to COM eliminate need for external flyback components in relay/motor circuits. |
| Direct logic interface | No external base resistors required - 2.7kΩ internal series resistors enable seamless connection to MCU GPIOs or logic buffers. |
| Parallel output capability | Multiple channels can be wired in parallel to deliver >500mA per load - e.g., two channels yield 1A sink for high-power solenoids. |
| High-voltage tolerance | 50V VCE rating accommodates 24V/48V systems with headroom for transient overvoltage events per ISO 7637-2. |
Applications
| Automotive Relay Control | Stepper Motor Phase Driver |
|---|---|
Use Scenario: Driving 12V automotive power relays (e.g., HVAC blower, headlight, fuel pump) from an MCU with 3.3V GPIOs. IC Role / Device Role / Timing Role: High-side switch replacement acting as grounded-sink driver - turns relay coil on/off by completing circuit to ground via E pin. Use Value: Eliminates need for discrete MOSFETs and gate drivers; internal clamp diodes absorb 12V coil flyback energy, preventing MCU damage. |
Use Scenario: Controlling unipolar stepper motor phase windings in engine management or ADAS camera positioning modules. IC Role / Device Role / Timing Role: Current-sinking driver for each phase winding - sequenced via MCU PWM to generate precise magnetic field rotation. Use Value: 500mA per channel supports typical 400–450mA stepper coils; parallel outputs allow dual-phase activation for higher torque without layout changes. |
| Lamp and LED Load Switching | Industrial Solenoid Actuation |
Use Scenario: Switching incandescent lamps (e.g., dashboard backlighting) and high-brightness LED arrays in commercial vehicle dashboards. IC Role / Device Role / Timing Role: Constant-current sink for resistive/LED loads - COM pin left floating; pull-up resistors define logic-high level at load node. Use Value: Low VCE(sat) (<1.4V) ensures >90% efficiency at 350mA, minimizing thermal stress in confined dashboard enclosures. |
Use Scenario: Operating 24V DC solenoids in agricultural machinery valves and industrial pneumatic controls requiring robust ESD immunity. IC Role / Device Role / Timing Role: Inductive load switch with integrated suppression - COM tied to 24V rail, E to ground, enabling fast turn-off with controlled decay. Use Value: ±2000V HBM ESD rating prevents field failures during handling; 105°C operation sustains performance in hot engine bay environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Darlington array applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ULN2003A | Non-automotive grade; rated for –20°C to 70°C only; no AEC-Q100 qualification; identical pinout and 2.7kΩ base resistors. | Suitable for commercial/industrial use only - not approved for automotive production or safety-critical subsystems. | Select ULN2003A only for cost-sensitive non-automotive designs where extended temperature and qualification are unnecessary. |
| ULQ2004A-Q1 | 10.5kΩ input resistors; requires ≥6V logic input; lower input current (0.5mA typ. at 5V); same 500mA/50V ratings and AEC-Q100 qualification. | Designed for higher-voltage CMOS interfaces (e.g., 12V microcontrollers); incompatible with 3.3V-only MCUs without level shifting. | Choose ULQ2004A-Q1 when driving from 6–15V logic sources; avoid if interfacing with 3.3V/5V microcontrollers without translation. |
Compared with ULN2003A, ULQ2003ATDRAS adds automotive qualification and extended temperature range without altering footprint or drive behavior; versus ULQ2004A-Q1, it provides native 3.3V/5V compatibility at the cost of higher input current draw.
Availability
ULQ2003ATDRAS is available at Aetrix Electronics and suitable for automotive relay control, stepper motor actuation, lamp/LED switching, and industrial solenoid applications requiring stable component supply across long production lifecycles.
Supply support for ULQ2003ATDRAS includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and automotive electronics, with decades of expertise in high-reliability power interface solutions.
The ULQ200xA-Q1 product line was engineered specifically for AEC-Q100-compliant automotive body electronics - delivering ruggedized Darlington arrays that simplify high-current, high-voltage load switching in harsh environments.
FAQ
What is the maximum continuous current per channel for ULQ2003ATDRAS?
The ULQ2003ATDRAS supports 500mA continuous collector current per Darlington channel under recommended operating conditions (TA ≤ 85°C, derated per RθJA). At 105°C ambient, maximum continuous current drops to 342mA per channel in SOIC package due to thermal limits. This rating applies individually to each of the seven channels and assumes proper PCB copper pour for heat dissipation.
Does ULQ2003ATDRAS require external flyback diodes when driving relays?
No, ULQ2003ATDRAS does not require external flyback diodes when driving relays. It integrates seven monolithic clamp diodes with a common cathode (COM pin). To use them, connect the COM pin to the positive side of the relay coil supply - the diodes then safely recirculate inductive energy during turn-off, protecting both the IC and upstream circuitry.
Can ULQ2003ATDRAS be used with a 3.3V microcontroller?
Yes, ULQ2003ATDRAS is fully compatible with 3.3V microcontrollers. Its 2.7kΩ internal base resistors ensure reliable turn-on with input voltages as low as 2.7V (VI(on) min), and typical input current is 1.35mA at 3.85V - well within standard GPIO drive capability. No level-shifting circuitry is needed.
What is the purpose of the E pin on ULQ2003ATDRAS?
Pin E is the common emitter terminal for all seven Darlington transistors. It must be connected to system ground (or the low-side reference) to complete the current path. Unlike the COM pin, E carries the full sum of all active channel emitter currents - up to 2.5A total - so it requires a wide PCB trace or plane for thermal and current-handling integrity.
Is ULQ2003ATDRAS pin-compatible with ULN2003A?
Yes, ULQ2003ATDRAS is pin-compatible with ULN2003A in SOIC-16 package: identical pin numbering, function mapping (1B–7B, 1C–7C, E, COM), and footprint. However, ULQ2003ATDRAS adds AEC-Q100 qualification, extended temperature range (–40°C to 105°C), and tighter process controls - making it a drop-in upgrade for automotive designs.
ULQ2003ATDRAS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Series:
- ULx200xA
- Packaging:
- Bulk
- Product Status:
- Active
- Switch Type:
- Relay, Solenoid Driver
- Number of Outputs:
- 7
- Ratio - Input:Output:
- 1:1
- Output Configuration:
- Low Side
- Output Type:
- Darlington
- Interface:
- Parallel
- Voltage - Load:
- 50V (Max)
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 500mA
- Rds On (Typ):
- -
- Input Type:
- Inverting
- Features:
- -
- Fault Protection:
- -
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ULQ2003ATDRAS FAQ
1.How can I place an order for ULQ2003ATDRAS through Aetrix?
Please submit a Request for Quotation (RFQ) for ULQ2003ATDRAS on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ULQ2003ATDRAS reliable?
The price and inventory of ULQ2003ATDRAS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ULQ2003ATDRAS is usually 5 days.
3.What payment methods are accepted for ULQ2003ATDRAS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ULQ2003ATDRAS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ULQ2003ATDRAS?
ULQ2003ATDRAS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ULQ2003ATDRAS order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ULQ2003ATDRAS?
For technical support, including ULQ2003ATDRAS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ULQ2003ATDRAS requirements.
6.How does Aetrix verify that ULQ2003ATDRAS is sourced from the original manufacturer or authorized distributors?
All ULQ2003ATDRAS products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ULQ2003ATDRAS meets industry standards.
7.What is the process for return or replacement of ULQ2003ATDRAS?
All ULQ2003ATDRAS units undergo pre-shipment inspection (PSI). If there is an issue with ULQ2003ATDRAS, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ULQ2003ATDRAS part is unused and in its original packaging.
Return procedure for ULQ2003ATDRAS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ULQ2003ATDRAS Tags
-
TPS22919DCKR
Texas Instruments
-
MIC2091-1YM5-TR
Microchip Technology
-
MIC2090-1YM5-TR
Microchip Technology
-
TPS22995RZFR
Texas Instruments
-
TPS22975DSGR
Texas Instruments
-
SIP32510DT-T1-GE3
Vishay Siliconix
-
ULN2003D1013TR
STMicroelectronics
-
MIC2005A-1YM5-TR
Microchip Technology
-
MIC2005A-1YM6-TR
Microchip Technology
-
TPS22916BYFPR
Texas Instruments
-
TPS22917DBVR
Texas Instruments
-
ULN2003APWR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
