Diodes Incorporated LM2903QTH-13

Overview

LM2903QTH-13 from Diodes Incorporated is an automotive-grade dual differential comparator with AEC-Q100 Grade 1 qualification, designed for voltage-level detection and signal conditioning in harsh environments. It operates from a single 2V–36V supply or dual ±1.0V–±18V supplies, delivers 0.6mA typical supply current, features 2mV typical input offset voltage (non-A version), and drives TTL/CMOS loads directly - used in battery monitoring, overvoltage protection, and window comparator circuits.

For engineers reviewing the LM2903QTH-13 datasheet, LM2903QTH-13 pinout, LM2903QTH-13 application, or LM2903QTH-13 equivalent, key selection criteria include its rail-to-rail common-mode input range (0V to V_CC−1.5V), open-collector output capable of sinking 16mA, low 200mV saturation voltage at 4mA, and guaranteed operation from −40°C to +125°C.

Technical Context

The LM2903QTH-13 integrates two independent high-gain comparators with PNP input stages enabling ground-sensing capability and common-mode voltage down to 0V. Each channel features uncommitted NPN output transistors configured as open-collector switches, allowing wired-OR logic and flexible pull-up voltage selection independent of V_CC.

Its internal bias network ensures supply current remains stable across 2V–36V operation, while differential input voltage tolerance extends to ±36V - permitting inputs to exceed V_CC without damage. Input offset voltage is trimmed to 2mV (typ) and drifts less than 7μV/°C over temperature.

Key Specifications

Pinout & Package

LM2903QTH-13 is housed in an SO-8 package with industry-standard pinout and green mold compound. The device uses lead-free, halogen-free construction and meets RoHS 3 and AEC-Q100 Grade 1 requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2903DR2G, LM2903QTH-13 offers identical performance with enhanced traceability for automotive production; versus TLV3702QDRQ1, it trades higher quiescent current for 36V differential input robustness and wider supply range essential in powertrain applications.

Availability

LM2903QTH-13 is available at Aetrix Electronics and suitable for automotive battery management, industrial overvoltage protection, and HVAC zero-crossing detection requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LM2903QTH-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 manufacturer specializing in discrete, analog, and mixed-signal solutions, with ISO/TS 16949-certified automotive production facilities and broad AEC-Q100-qualified portfolio.

The LM2903Q series belongs to Diodes' automotive-compliant precision comparator product line, engineered specifically for voltage monitoring, fault detection, and signal conditioning in safety-critical vehicle subsystems.

FAQ

Can LM2903QTH-13 operate from a 3.3V supply?

Yes - the LM2903QTH-13 supports single-supply operation from 2V to 36V, making it fully compatible with 3.3V systems. Its input common-mode range includes ground, and output can sink current into a 3.3V pull-up. However, output saturation voltage (200mV at 4mA) means minimum logic-low level will be ~200mV, which is acceptable for standard TTL and CMOS inputs.

Does LM2903QTH-13 require external hysteresis?

Hysteresis is not mandatory but strongly recommended for noisy input signals. The device has no internal hysteresis; adding 1–10mV positive feedback via resistor networks prevents oscillation during slow input transitions. Applications with clean, fast-rising signals (e.g., crystal oscillator outputs) may omit hysteresis without instability.

What is the maximum sink current per output?

Each output can sink up to 16mA continuously while maintaining saturation voltage ≤400mV (over full temperature range). At 4mA load, typical saturation voltage is 200mV. Exceeding 16mA causes the output transistor to exit saturation, raising V_OUT rapidly - this limits absolute maximum safe sink current to 16mA.

Is LM2903QTH-13 pin-compatible with legacy LM2903 variants?

Yes - LM2903QTH-13 uses the standard SO-8 pinout defined for LM2903 devices (1=OUT1, 2=IN1−, 3=IN1+, 4=GND, 5=IN2+, 6=IN2−, 7=OUT2, 8=V_CC). It replaces non-automotive LM2903 versions in new designs requiring AEC-Q100 qualification, with identical electrical behavior and layout compatibility.