Diodes Incorporated LM2903TH-13

Overview

LM2903TH-13 from Diodes Incorporated is a dual precision voltage comparator with open-collector outputs, designed for single-supply operation from 2V to 36V or split supplies (±1.0V to ±18V). It features 2mV typical input offset voltage (non-A grade), 25nA input bias current, and 200mV output saturation voltage at 4mA sink current. Used in overvoltage detection, zero-crossing sensing, and level-shifting interfaces in industrial power supplies and motor control feedback loops.

For engineers reviewing the LM2903TH-13 datasheet, LM2903TH-13 pinout, LM2903TH-13 application, or LM2903TH-13 equivalent, key selection criteria include input common-mode range extending to ground, rail-to-rail differential input capability, TTL/CMOS-compatible output drive, and guaranteed performance across –40°C to +125°C ambient temperature.

Technical Context

The LM2903TH-13 integrates two independent comparators with PNP input stages enabling common-mode voltage down to ground and differential input voltage up to 36V-exceeding V_CC. Each channel uses an uncommitted NPN output transistor with no internal pull-up, requiring external pull-up for logic-level translation.

Its quiescent supply current (0.6mA typical at 5V) remains stable across supply voltage and temperature, and its 1.3µs response time (with 5.1kΩ load) supports fast threshold detection in real-time monitoring circuits without hysteresis dependency for pulse inputs.

Key Specifications

Pinout & Package

TSSOP-8 package (3.0mm × 4.4mm, 0.65mm pitch), green mold compound, RoHS-compliant, halogen- and antimony-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DR and TLV3702IDR, LM2903TH-13 uniquely combines wide supply range (2V–36V), ground-sensing inputs, and industrial temperature rating in a standard TSSOP-8 package - making it optimal for ruggedized power management and motor control where reliability across voltage and thermal extremes is non-negotiable.

Availability

LM2903TH-13 is available at Aetrix Electronics and suitable for industrial power supplies, motor control feedback systems, and battery management units requiring stable component supply across extended temperature and voltage ranges.

Supply support for LM2903TH-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with emphasis on high-reliability solutions for automotive, industrial, and computing markets.

The LM2903 series belongs to Diodes' precision analog comparator product line, engineered for robust operation in noisy, wide-voltage industrial environments where ground-referenced sensing and rail-tolerant inputs are essential.

FAQ

Can LM2903TH-13 operate with a 3.3V supply and interface directly with a 3.3V microcontroller?

Yes. The LM2903TH-13 functions down to 2V supply and its open-collector outputs can be pulled up to 3.3V, producing valid logic-low (<0.4V) and logic-high (3.3V) levels compatible with 3.3V CMOS inputs. Input common-mode range includes ground, allowing direct connection to 3.3V ADC references or sensor outputs without level shifting.

Does LM2903TH-13 require hysteresis for stable operation with slow-moving input signals?

Yes. Due to its high gain and lack of internal hysteresis, the LM2903TH-13 may oscillate when comparing slowly varying or noisy signals near the threshold. External positive feedback (e.g., 10MΩ resistor from OUT to IN+) adds ~10mV hysteresis, eliminating chatter in applications like temperature threshold detection or power-good monitoring.

What is the maximum sink current per output, and how does it affect output voltage?

Each output can sink up to 16mA continuously. At 4mA, saturation voltage is ≤200mV; at 16mA, it rises to ≤700mV (per datasheet). To maintain <0.4V logic-low with 16mA load, use a 220Ω pull-up to 5V or reduce load current via higher-value pull-up resistors in low-speed applications.

Is LM2903TH-13 pin-compatible with other dual comparators in TSSOP-8 packages?

Yes - LM2903TH-13 follows industry-standard TSSOP-8 pinout for dual comparators (OUT1, IN1–, IN1+, GND, IN2+, IN2–, OUT2, V_CC). It is functionally and physically interchangeable with LM393DR, TLC3702IPW, and MAX9022EUA+ in the same package, though electrical specs (offset, speed, temp range) differ and must be verified per application.