Diodes Incorporated ULN2003F12FN-7

Overview

ULN2003F12FN-7 from Diodes Incorporated is a 4-channel high-current NPN Darlington sink driver IC designed for inductive load switching in microcontroller-based systems. It supports 3.3V/5V logic inputs, delivers up to 140mA per channel at 5V input, features integrated freewheeling diodes with common cathode (COM) pin, and uses a 10-pin DFN3030 package rated for 20V output pull-up voltage - enabling direct relay and stepper motor coil driving without external flyback protection.

For engineers reviewing the ULN2003F12FN-7 datasheet, ULN2003F12FN-7 pinout, ULN2003F12FN-7 application, or ULN2003F12FN-7 equivalent, key selection criteria include per-channel sink current capability (100mA @ 3.3V / 140mA @ 5V), low VOL (0.6V typ. @ 140mA), input RC snubber for noise immunity, tri-state-compatible input pull-down (210k–390kΩ), and DFN3030 thermal performance (θJA = 65°C/W).

Technical Context

The ULN2003F12FN-7 implements four independent NPN Darlington pairs with built-in base resistors, input clamping diodes, and emitter-connected outputs configured as low-side switches. Each channel integrates an RC snubber network (ζ = 9ns) and a pull-down resistor to ensure defined logic state during MCU reset or tri-state operation.

Its COM pin connects the cathodes of all internal freewheeling diodes, allowing inductive energy recirculation during turn-off. When multiple outputs are paralleled, total sink current scales - up to 1.0A with full channel combination - while maintaining V_OL ≤ 0.75V under 140mA/channel conditions at 5V logic drive.

Key Specifications

Pinout & Package

ULN2003F12FN-7 uses a 10-pin U-DFN3030-10 package (3.0 × 3.0 × 0.6mm, wettable flanks), optimized for high thermal conductivity and space-constrained PCB layouts. The exposed thermal pad (Pin 5/GND) must be soldered to a dedicated copper pour for optimal junction-to-board heat transfer.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current sink driver applications.

Compared with ULN2003A-S08-G, ULN2003F12FN-7 offers lower power loss, superior noise immunity, and smaller footprint; versus TB6549FG, it provides simpler implementation, zero configuration overhead, and lower cost for basic sink switching - making it optimal for cost-sensitive, noise-prone relay and stepper applications.

Availability

ULN2003F12FN-7 is available at Aetrix Electronics and suitable for industrial relay control, unipolar stepper motor actuation, and logic-level translation requiring stable component supply, long-term manufacturability, and RoHS 3 compliance.

Supply support for ULN2003F12FN-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and interface solutions for industrial, computing, and consumer markets.

The ULN2003F12FN-7 belongs to Diodes' ULN2003 family of Darlington array drivers - engineered specifically for robust, low-component-count interfacing between modern low-voltage logic and legacy 12V+ inductive loads.

FAQ

What is the maximum continuous sink current per channel at 3.3V logic input?

The ULN2003F12FN-7 delivers 100mA per channel continuously at 3.3V logic input with V_OL ≤ 0.75V, verified across -40°C to +125°C junction temperature range. This is measured with V_OUT = 0.6V and accounts for thermal derating in the DFN3030 package.

Can multiple output pins be paralleled to increase current capacity?

Yes - OUT1 through OUT4 share the same COM pin and can be wired in parallel to increase total sink current. With all four channels combined, the device supports up to 500mA continuous (derated above +85°C ambient), limited by package thermal resistance (θ_JA = 65°C/W) and GND pin current rating (700mA).

Does the ULN2003F12FN-7 require external flyback diodes when driving relays?

No - each channel includes an integrated freewheeling diode with cathodes tied to the COM pin. Connecting COM to the positive supply of the relay coil provides complete inductive kickback protection without external components, as confirmed in the functional diagram and absolute maximum ratings.

Is the ULN2003F12FN-7 qualified for automotive applications?

No - the ULN2003F12FN-7 is not AEC-Q100 qualified. Diodes Incorporated explicitly states that automotive-grade variants require PPAP capability and IATF 16949 manufacturing; this part is intended for industrial, commercial, and consumer applications only.