STMicroelectronics LM2903WDT

Overview

LM2903WDT from STMicroelectronics is a low-power, dual-voltage comparator in SO-8 package, operating from +2 V to +36 V single supply or ±1 V to ±18 V dual supplies, with 0.4 mA supply current, 25 nA input bias current, and 250 mV typical output saturation voltage at 4 mA sink-used in industrial voltage monitoring and automotive sensor interface circuits.

For engineers reviewing the LM2903WDT datasheet, LM2903WDT pinout, LM2903WDT application, or LM2903WDT equivalent, key selection criteria include input common-mode range extending to negative rail, TTL/CMOS-compatible open-collector outputs, ESD protection (2 kV HBM), and guaranteed operation from −40 °C to +125 °C.

Technical Context

The LM2903WDT integrates two independent comparators with PNP input stages enabling rail-to-rail common-mode input down to VCC−, even under single-supply operation. Its open-collector outputs support wired-OR logic and level translation across mixed-voltage systems.

Internal ESD protection (2 kV HBM) and thermal design (R_thJA = 125 °C/W for SO-8) ensure robustness in noisy industrial environments. Differential input voltage range equals full supply voltage, allowing inputs to swing beyond rails within absolute maximum limits.

Key Specifications

Pinout & Package

LM2903WDT uses the SO-8 (Plastic micropackage) with standard 1.27 mm pitch, 5.0 mm × 6.2 mm body, and 1.75 mm height-compatible with automated SMT assembly and IPC-7351B footprint MS-012AA.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-power comparator applications.

Compared with LM393DR and TLV3702IDR, LM2903WDT uniquely combines 36 V operation, −40 °C to +125 °C rating, open-collector outputs, and 2 kV ESD-making it optimal for ruggedized industrial and automotive power monitoring where interoperability with legacy logic and high-voltage tolerance are mandatory.

Availability

LM2903WDT is available at Aetrix Electronics and suitable for industrial voltage monitoring, automotive sensor interface, zero-crossing detection, and power supply sequencing requiring stable component supply across extended temperature and voltage ranges.

Supply support for LM2903WDT 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 microcontrollers, power ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The LM2903W series belongs to ST's precision analog comparators product line, engineered for reliability in harsh environments-including extended temperature operation, high-voltage tolerance, and robust ESD protection-targeting industrial automation and automotive subsystems.

FAQ

Can LM2903WDT operate with a single 3.3 V supply?

Yes. The LM2903WDT supports single-supply operation from +2 V to +36 V. At 3.3 V, its input common-mode range extends from 0 V to 1.8 V (VCC+ − 1.5 V), and output saturation remains below 400 mV at 4 mA sink-enabling direct interfacing with 3.3 V logic when paired with appropriate pull-up resistors.

Does LM2903WDT require external hysteresis resistors?

Yes. The LM2903WDT has no internal hysteresis. External positive feedback (e.g., resistor from Output 1 to Inverting Input 1) must be added to prevent oscillation near threshold-typical values range from 100 kΩ to 1 MΩ depending on required hysteresis width and source impedance.

What is the maximum sink current per output?

The absolute maximum sink current is 20 mA, but the datasheet specifies 6–16 mA typical output sink capability at V_OL ≤ 400 mV. For reliable long-term operation, ST recommends limiting continuous sink current to ≤12 mA to maintain junction temperature within safe limits under worst-case ambient conditions.

Is LM2903WDT pin-compatible with LM2903DT?

No. LM2903WDT uses SO-8 packaging with standard pinout (Output 1, In−1, In+1, VCC−, In+2, In−2, Output 2, VCC+). LM2903DT is obsolete and was offered in DIP-8; while functional equivalence exists, physical layout, thermal performance, and modern qualification (AEC-Q100 for WY variants) differ significantly.