STMicroelectronics LM2903DT

Overview

LM2903DT from STMicroelectronics is a low-power dual voltage comparator in SO8 package, operating from single supply (2–36 V) or dual supplies (±1 V to ±18 V), with input common-mode range extending to the negative rail, 25 nA typical input bias current, and 250 mV typical output saturation voltage at 4 mA sink - used in automotive window lift control, industrial overvoltage detection, and battery-powered sensor thresholding.

For engineers reviewing the LM2903DT datasheet, LM2903DT pinout, LM2903DT application, or LM2903DT equivalent, key selection considerations include rail-to-rail input capability on negative side, TTL/CMOS-compatible open-collector outputs, temperature range (−40 °C to +125 °C), and SO8 packaging for legacy PCB compatibility and thermal performance (R_thJA = 125 °C/W).

Technical Context

The LM2903DT integrates two independent comparators with PNP input stages enabling input voltages down to −0.3 V (or below negative rail), supporting single-supply operation without level-shifting circuitry. Its large-signal voltage gain is 25–200 V/mV at 15 V supply with 15 kΩ load, and response time is 500 ns (large-signal, 95% settling) under TTL-compatible conditions.

It features differential input voltage tolerance up to ±36 V, absolute maximum supply voltage of ±18 V or 36 V, and guaranteed operation across −40 °C to +125 °C. Input offset voltage is 1–15 mV over temperature, and output can sink up to 16 mA while maintaining ≤700 mV saturation voltage.

Key Specifications

Pinout & Package

LM2903DT is supplied in SO8 (plastic micropackage), with exposed pad optional for thermal enhancement. Pin 1 is OUT1, pin 2 is IN1−, pin 3 is IN1+, pin 4 is VCC− (GND in single-supply use), pin 5 is IN2+, pin 6 is IN2−, pin 7 is OUT2, and pin 8 is VCC+.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual voltage comparator applications.

Compared with LM2903W and LM2903H, the LM2903DT offers optimal cost-performance balance for general-purpose industrial and automotive body electronics where extended temperature or ultra-high ESD immunity are not mandated.

Availability

LM2903DT is available at Aetrix Electronics and suitable for automotive body control modules, industrial programmable logic controllers, and battery management systems requiring stable component supply across long production lifecycles.

Supply support for LM2903DT 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, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

The LM2903 product line delivers robust, low-power dual comparators optimized for harsh-environment applications including automotive subsystems, industrial safety interlocks, and energy metering interfaces.

FAQ

Can LM2903DT operate from a single 3.3 V supply?

Yes. The LM2903DT supports single-supply operation from +2 V to +36 V, including 3.3 V. At 3.3 V, it maintains full functionality: input common-mode range extends to ground, output can sink ≥6 mA, and propagation delay remains within specification. However, output high level is undefined (open-collector), so an external pull-up to 3.3 V is required.

What is the maximum sink current before output saturation exceeds 400 mV?

At 25 °C and V_CC = 5 V, the LM2903DT guarantees ≤400 mV output saturation voltage for sink currents up to 4 mA (typical 250 mV). Beyond 4 mA, voltage rises nonlinearly; at 16 mA (absolute max), saturation reaches 700 mV. For designs requiring <400 mV at higher loads, derate ambient temperature or add heatsinking.

Does LM2903DT require external hysteresis for noise immunity?

Yes - the LM2903DT has no internal hysteresis. When comparing slowly varying or noisy signals (e.g., thermistor outputs), external positive feedback (e.g., 10 MΩ resistor from OUT to IN+) must be added to prevent multiple transitions near threshold. Typical hysteresis width is set by resistor ratio and output swing; 10–50 mV is common for industrial sensors.

Is the SO8 package of LM2903DT lead-free and RoHS compliant?

Yes. Per STMicroelectronics ECOPACK documentation, the LM2903DT SO8 package is lead-free, halogen-free, and fully RoHS 2011/65/EU compliant. It meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) and qualifies for standard reflow profiles including peak temperatures up to 260 °C.