Diodes Incorporated LM2903S-13

Overview

LM2903S-13 from Diodes Incorporated is a dual precision voltage comparator IC with open-collector outputs, designed for single-supply operation from 2V to 36V or split supplies (±1.0V to ±18V), featuring 2mV typical input offset voltage, 0.6mA supply current, and rail-to-rail common-mode input range including ground - used in overvoltage detection, window comparators, and level-shifting interfaces in industrial power monitoring systems.

For engineers reviewing the LM2903S-13 datasheet, LM2903S-13 pinout, LM2903S-13 application, or LM2903S-13 equivalent, key selection criteria include its guaranteed 2mV max offset (non-A grade), 4mA output sink capability with 200mV saturation voltage, TTL/CMOS-compatible output stage, and SO-8 package compatibility with legacy board layouts.

Technical Context

The LM2903S-13 implements two independent PNP-input comparators with uncommitted NPN output transistors, enabling wired-OR logic and flexible pull-up configuration across supply domains. Its input stage operates down to ground and tolerates differential inputs up to 36V, independent of VCC magnitude.

Supply current remains constant (0.6mA typ) across the full 2V–36V range due to bias network design, and response time is 1.3µs (typ) at 5V with 5.1kΩ load - optimized for DC and low-frequency threshold detection rather than high-speed signaling.

Key Specifications

Pinout & Package

LM2903S-13 is housed in an industry-standard SO-8 package (4.9mm × 6.0mm, 1.27mm pitch), RoHS-compliant, green mold compound, with exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DR, LM2903S-13 delivers tighter offset control and lower supply current for precision DC monitoring; versus TLV3702IDR, it trades ultra-low power and rail-to-rail capability for pin compatibility and proven robustness in industrial voltage ranges.

Availability

LM2903S-13 is available at Aetrix Electronics and suitable for industrial power supervision, battery management systems, and analog front-end signal conditioning requiring stable component supply across extended temperature ranges (−40°C to +125°C).

Supply support for LM2903S-13 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 components for industrial, automotive, and computing markets.

The LM2903 series belongs to Diodes' precision analog comparator product line, engineered for robust DC-level detection in harsh environments with wide supply tolerance and ESD-hardened inputs.

FAQ

What is the maximum differential input voltage the LM2903S-13 can withstand?

The LM2903S-13 supports a differential input voltage of up to 36V, as specified in its Absolute Maximum Ratings. This allows direct comparison of signals exceeding the supply rail - for example, a 30V sensor output against a 5V reference - without external attenuation or clamping, provided common-mode voltage stays within 0V to VCC−1.5V.

Can the LM2903S-13 drive a 5V logic input directly from its output?

Yes, but only when configured with a 5V pull-up resistor on the open-collector output. The output sinks current to ground and cannot source - so a 5V pull-up ensures a valid logic-high level. With 4mA sink, saturation voltage remains ≤200mV, guaranteeing a clean logic-low compatible with standard TTL and CMOS inputs.

Does the LM2903S-13 require hysteresis for stable operation?

Hysteresis is recommended for slow-moving or noisy input signals to prevent multiple transitions near the threshold. The device has no internal hysteresis; external positive feedback (e.g., 10MΩ from output to non-inverting input) adds ~10mV of hysteresis. For clean, fast-rising pulses (e.g., encoder edges), hysteresis is unnecessary due to its 1.3µs response time.

Is the LM2903S-13 pin-compatible with older LM2903 variants from other manufacturers?

Yes - the LM2903S-13 uses the industry-standard SO-8 pinout defined for dual comparators (1OUT, 1IN−, 1IN+, GND, 2IN+, 2IN−, 2OUT, VCC), matching TI, ON Semiconductor, and STMicroelectronics LM2903 variants. No PCB redesign is needed when substituting, provided thermal and ESD requirements align with Diodes' specifications.