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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Bipolar Transistor Arrays

STMicroelectronics E-ULN2001A

Name: E-ULN2001A
Brand: STMicroelectronics
SKU: E-ULN2001A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: E-ULN2001A

Manufacturer:: STMicroelectronics

Category:: Bipolar Transistor Arrays

Package:: 16-DIP (0.300", 7.62mm)

Datasheet:: E-ULN2001A.pdf

Description:: TRANS 7NPN DARL 50V 500MA 16DIP

Quantity:: RFQ Add To RFQ list

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Inventory:7,530

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Product details

Overview

E-ULN2001A from STMicroelectronics is a seven-channel high-voltage, high-current Darlington array IC with open-collector outputs, integrated flyback diodes, 500 mA continuous per channel, 50 V output voltage rating, and TTL/DTL/PMOS/CMOS-compatible inputs-designed for driving relays, solenoids, and LED displays in industrial control interfaces.

For engineers reviewing the E-ULN2001A datasheet, E-ULN2001A pinout, E-ULN2001A application, or E-ULN2001A equivalent, key selection criteria include per-channel current capability, input logic family compatibility (ULN2001A supports DTL/TTL/PMOS/CMOS), thermal resistance in DIP-16 package, and integrated clamp diode configuration for inductive load safety.

Technical Context

The E-ULN2001A implements seven independent Darlington transistor pairs with common-emitter configuration and on-chip suppression diodes connected from each collector to the common cathode pin (pin 9). Each channel operates as a grounded-emitter switch with open-collector output, enabling wired-OR logic and direct interface to inductive loads without external flyback components.

Input pins (1–7) are arranged opposite output pins (10–16) on the DIP-16 package to minimize PCB trace crosstalk and simplify routing. The device uses a copper leadframe to achieve R_thJA = 70 °C/W, supporting sustained 500 mA operation at T_A ≤ 70 °C with single-channel activation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage rating	50 V - supports relay coils and solenoids up to 48 V DC systems without external clamping.
Continuous output current	500 mA per channel - enables direct drive of medium-power electromechanical loads without external buffering.
Peak output current	600 mA - allows short-duration surge handling for motor startup or relay pull-in transients.
V_CE(SAT) @ 350 mA	1.3–1.6 V - limits power dissipation to ≤560 mW per active channel at full rated current.
Input compatibility	TTL/DTL/PMOS/CMOS - accepts logic-high thresholds from 2.4 V (ULN2001A) to 13 V, eliminating level-shifting circuitry.
Integrated clamp diodes	Rated 50 V reverse, 350 mA continuous - suppresses inductive kickback energy directly into V_CC rail or common cathode (pin 9).
Thermal resistance (R_thJA)	70 °C/W (DIP-16) - defines maximum ambient temperature derating curve for multi-channel operation.

Pinout & Package

The E-ULN2001A is supplied in a 16-pin dual in-line package (DIP-16L) with copper leadframe for enhanced thermal performance. Pin 1 is located at the top-left corner when viewed from the top with notch or dot orientation.

Pin/Terminal	Circuit Role	Design Meaning
1–7	Input (IN1–IN7)	Logic-level control inputs compatible with TTL/DTL/PMOS/CMOS; internally connected to Darlington base resistors.
8	GND	Common emitter reference and substrate ground connection for all seven Darlington pairs.
9	COM (common cathode)	Connection point for internal clamp diode cathodes; tied to external +V supply for inductive load energy recirculation.
10–16	Output (OUT1–OUT7)	Open-collector Darlington collectors; sink current to GND when corresponding input is high.

Key Features

Feature	Design Value
Seven-channel integration	Reduces board space and component count versus discrete transistor+diode solutions for multi-load control.
Input-output pin opposition	Enables straight-through PCB layout with minimal crossing traces-critical for noise-sensitive industrial I/O modules.
Parallel output capability	Multiple outputs can be wired together to deliver up to 1.0 A (2×500 mA) with matched V_CE(SAT) and thermal sharing.
Copper leadframe construction	Lowers thermal resistance by ~25% vs. standard iron leadframes, extending safe operating area at elevated ambient temperatures.
ESD rating	2 kV HBM - provides robustness against handling and assembly electrostatic discharge in manufacturing environments.

Applications

Industrial Relay Control

LED Matrix Display Driver

Use Scenario: Controlling 24 VDC industrial relays in PLC I/O expansion modules with isolated field-side wiring.

IC Role / Device Role / Timing Role: High-side switched load driver with integrated flyback protection; acts as logic-to-power interface between microcontroller GPIO and relay coil.

Use Value: Eliminates need for seven external 1N4004 diodes and current-limiting resistors, reducing BOM cost by ≥$0.18/unit and improving long-term reliability.

Use Scenario: Row/column scanning of 7-segment LED displays in HVAC control panels requiring multiplexed current sinking.

IC Role / Device Role / Timing Role: Current-sinking digit driver with fast turn-off (t_PHL ≤ 1 µs) to support >1 kHz multiplex rates without ghosting.

Use Value: Delivers consistent 20 mA per segment across temperature (−40°C to +85°C) using fixed V_CE(SAT)-based current regulation.

Solenoid Actuator Interface

Thermal Print Head Driver

Use Scenario: Driving 12 V solenoid valves in automated fluid control systems with intermittent duty cycles.

IC Role / Device Role / Timing Role: Inductive load switch with built-in energy recirculation path via pin 9; handles 600 mA peak during valve pull-in.

Use Value: Prevents voltage spikes >50 V at controller outputs, avoiding damage to upstream MCU I/O pins or optocouplers.

Use Scenario: Powering thermal printhead elements in POS receipt printers where precise pulse-width-controlled heating is required.

IC Role / Device Role / Timing Role: Fast-switching current sink enabling 10–100 µs pulse widths with <1 µs delay matching across all 7 channels.

Use Value: Ensures uniform dot density and print contrast by minimizing channel-to-channel timing skew (<0.25 µs).

Equivalent & Alternatives

The following parts are listed as comparable options for similar Darlington array applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ULN2003A	Optimized for 5 V TTL/CMOS inputs (V_I(ON) = 2.4 V min); lower input threshold than ULN2001A (2.7 V min).	Better suited for direct interfacing with 5 V microcontrollers without pull-up resistors.	Select ULN2003A when driving from 5 V logic; ULN2001A remains preferred for mixed-voltage systems with DTL or higher-V_CC PMOS sources.
TD62003APG	Same pinout and function but Toshiba part with R_thJA = 75 °C/W (DIP-16); no ECOPACK compliance data published.	Compatible drop-in replacement in legacy designs; lacks ST's documented thermal derating curves.	Use TD62003APG only if ST sourcing is constrained; verify thermal margin at max ambient with measured R_thJA.

Compared with ULN2003A and TD62003APG, the E-ULN2001A offers broader input voltage compatibility (up to 30 V), tighter thermal specifications (70 °C/W), and full ECOPACK2 environmental compliance-making it optimal for new industrial designs requiring mixed-logic interfacing and lifecycle assurance.

Availability

E-ULN2001A is available at Aetrix Electronics and suitable for industrial automation controllers, building management systems, and embedded HMI display interfaces requiring stable component supply across extended product lifecycles.

Supply support for E-ULN2001A 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer applications.

The ULN200x series belongs to ST's high-reliability interface IC portfolio, engineered specifically for robust industrial I/O bridging-emphasizing fault tolerance, thermal resilience, and long-term parametric stability under harsh ambient conditions.

FAQ

What is the maximum number of E-ULN2001A outputs that can be safely paralleled?

Up to two outputs may be paralleled to deliver 1.0 A continuous, provided both channels share identical PCB trace length and thermal environment. Derating is required beyond two channels due to mismatched V_CE(SAT) causing current imbalance; ST does not recommend paralleling more than two outputs without external ballast resistors.

Can E-ULN2001A drive a 48 V relay coil?

Yes-the 50 V output voltage rating allows safe operation with 48 V DC relays. However, the clamp diode cathode (pin 9) must be connected to a 48 V rail (not 5 V or 12 V), and the relay coil must be placed between V_CC and the output pin to ensure proper flyback energy path through the internal diode.

Is E-ULN2001A RoHS and REACH compliant?

Yes-E-ULN2001A is manufactured in ST's ECOPACK2-compliant DIP-16L package, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Full material declarations and test reports are available via ST's Quality Portal using order code ULN2001A.

Does E-ULN2001A require external base resistors on input pins?

No-internal base resistors (typically 2.7 kΩ) are integrated for each Darlington pair, enabling direct connection to TTL/CMOS logic outputs. External resistors are only needed if interfacing with open-drain or high-impedance sources exceeding 30 V, where current limiting becomes necessary to avoid exceeding I_B(max) = 25 mA.

E-ULN2001A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: 7 NPN Darlington

Current - Collector (Ic) (Max):: 500mA

Voltage - Collector Emitter Breakdown (Max):: 50V

Vce Saturation (Max) @ Ib, Ic:: 1.6V @ 500µA, 350mA

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: 1000 @ 350mA, 2V

Power - Max:: -

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 16-DIP

E-ULN2001A FAQ

1.How can I place an order for E-ULN2001A through Aetrix?

Please submit a Request for Quotation (RFQ) for E-ULN2001A 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 E-ULN2001A reliable?

The price and inventory of E-ULN2001A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-ULN2001A is usually 5 days.

3.What payment methods are accepted for E-ULN2001A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-ULN2001A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for E-ULN2001A?

E-ULN2001A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your E-ULN2001A 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 E-ULN2001A?

For technical support, including E-ULN2001A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-ULN2001A requirements.

6.How does Aetrix verify that E-ULN2001A is sourced from the original manufacturer or authorized distributors?

All E-ULN2001A 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 E-ULN2001A meets industry standards.

7.What is the process for return or replacement of E-ULN2001A?

All E-ULN2001A units undergo pre-shipment inspection (PSI). If there is an issue with E-ULN2001A, 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 E-ULN2001A part is unused and in its original packaging.

Return procedure for E-ULN2001A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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