Texas Instruments LM239AQDRG4Q1

Overview

LM239AQDRG4Q1 from Texas Instruments is an AEC-Q100 qualified quad differential comparator IC designed for automotive voltage monitoring and threshold detection. It operates from single or dual supplies (2 V to 36 V), delivers 0.8 mA typical supply current, features 2 mV typical input offset voltage, 25 nA typical input bias current, and open-collector outputs compatible with TTL/MOS/CMOS logic in engine control units and battery management systems.

For engineers reviewing the LM239AQDRG4Q1 datasheet, LM239AQDRG4Q1 pinout, LM239AQDRG4Q1 application, or LM239AQDRG4Q1 equivalent, key selection considerations include its −40°C to +125°C automotive temperature range, ±36 V differential input capability, ground-sensing common-mode range, low output saturation voltage, and SOIC-14 package compatibility with high-reliability board layouts.

Technical Context

The LM239AQDRG4Q1 integrates four independent comparators with internal 80-µA current regulators per channel, enabling stable operation across wide supply voltages without external biasing. Its input stage supports common-mode voltages down to ground and differential inputs up to ±36 V, making it suitable for direct sensing of battery rails and motor feedback signals.

Each comparator features open-collector output capable of sinking up to 16 mA at 1.5 V saturation, with response times as low as 0.3 µs (TTL-level step, CL = 15 pF). The device's ESD protection exceeds 2000 V (Charged Device Model), 1000 V (MIL-STD-883), and 100 V (Machine Model), meeting stringent automotive robustness requirements.

Key Specifications

Pinout & Package

LM239AQDRG4Q1 is housed in a 14-pin SOIC (D) package with 1.27 mm pitch, 8.75 mm × 3.9 mm body, and 1.75 mm max height - compliant with JEDEC MS-012AB and IPC-7351 land patterns.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM239QDRQ1 (identical function, alternate finish) and TLV3704QDRQ1 (lower IQ but limited voltage range), LM239AQDRG4Q1 uniquely balances automotive-grade ruggedness, ground-referenced sensing, and wide-supply operation - making it the preferred choice for primary power and safety-critical monitoring where ±36 V input and −40°C to +125°C operation are mandatory.

Availability

LM239AQDRG4Q1 is available at Aetrix Electronics and suitable for automotive engine control units, battery management systems, ADAS power sequencing, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM239AQDRG4Q1 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

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with leadership in automotive, industrial, and power management solutions.

The LM239A-Q1 product line delivers AEC-Q100 qualified comparators optimized for functional safety-critical voltage monitoring in automotive powertrain, chassis, and electrification systems - emphasizing robustness, precision, and long-term supply stability.

FAQ

What is the maximum differential input voltage supported by the LM239AQDRG4Q1?

The LM239AQDRG4Q1 supports a differential input voltage of ±36 V, as specified in its absolute maximum ratings. This allows direct comparison of signals referenced to different potentials - such as battery voltage versus ground-referenced sensor outputs - without external attenuation or level-shifting circuitry. This rating applies across the full operating temperature range and is validated per TI's production test flow.

Does the LM239AQDRG4Q1 require external pull-up resistors on its outputs?

Yes, the LM239AQDRG4Q1 features open-collector outputs that require external pull-up resistors to define the high-state voltage level. Typical values range from 2.2 kΩ to 10 kΩ depending on sink current and rise-time requirements. The device does not include internal pull-ups, and omitting external pull-ups will result in undefined or floating output states during inactive periods.

Is the LM239AQDRG4Q1 pin-compatible with the industry-standard LM339?

No, the LM239AQDRG4Q1 is not pin-compatible with the LM339. While both are quad comparators in SOIC-14 packages, the LM239AQDRG4Q1 uses a different pinout: outputs are on pins 3, 6, 10, and 13, whereas the LM339 places outputs on pins 1, 2, 13, and 14. Interchanging them without PCB revision will cause functional failure and potential damage due to incorrect power and signal routing.

What is the input common-mode voltage range of the LM239AQDRG4Q1?

The LM239AQDRG4Q1 has a common-mode input voltage range that includes ground (0 V) and extends up to VCC − 1.5 V at 25°C, or VCC − 2 V across the full −40°C to +125°C range. This ground-sensing capability enables direct interface with sensors and signals referenced to system ground - a key requirement for automotive battery monitoring and fault detection circuits.

Can the LM239AQDRG4Q1 operate from a single 3.3 V supply?

Yes, the LM239AQDRG4Q1 can operate from a single 3.3 V supply, as its minimum rated supply voltage is 2 V. However, output logic levels will be limited by the 3.3 V rail, and input common-mode range shrinks to 0 V to 1.8 V (VCC − 1.5 V). For reliable TTL compatibility, a minimum 4.5 V supply is recommended; at 3.3 V, verify output sink strength and noise margins in the target application.