Diodes Incorporated AS339GTR-G1

Overview

AS339GTR-G1 from Diodes Incorporated is a quad low-power, low-offset voltage comparator IC with open-collector outputs, designed for single-supply operation from 2.0V to 36V (or ±1.0V to ±18V dual supply). It delivers 2.0mV typical input offset voltage, 0.9mA supply current, and 25nA typical input bias current-enabling precision threshold detection in battery-powered and industrial power management systems.

For engineers reviewing the AS339GTR-G1 datasheet, AS339GTR-G1 pinout, AS339GTR-G1 application, or AS339GTR-G1 equivalent, key selection criteria include input common-mode range extending to ground, differential input voltage equal to supply rail, low saturation voltage (200mV at 4mA), and RoHS-compliant green TSSOP-14 packaging.

Technical Context

The AS339GTR-G1 integrates four independent comparators with PNP-input stage architecture, supporting rail-to-rail input common-mode range down to ground and up to V_CC–1.5V. Its open-collector outputs allow wired-OR logic and flexible pull-up configuration across diverse logic families.

Designed as a drop-in replacement for industry-standard LM339, it maintains functional compatibility while improving input offset voltage tolerance and reducing supply current versus legacy variants-making it suitable for high-accuracy, low-quiescent-power sensing in DC-DC converters and PC motherboard voltage monitoring.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.4mm × 5.0mm body, 0.65mm pitch, exposed pad not present, RoHS-compliant green molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM339DR and TL331IDBVR, AS339GTR-G1 provides superior offset performance in a space-saving TSSOP-14 package with guaranteed green compliance-making it optimal for new designs prioritizing accuracy, density, and environmental certification.

Availability

AS339GTR-G1 is available at Aetrix Electronics and suitable for battery charger supervision, switching power supply fault detection, and PC motherboard voltage monitoring requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for AS339GTR-G1 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 design centers in Asia, Europe, and the U.S., and manufacturing in China, Taiwan, and the Philippines.

The AS339 series belongs to Diodes' precision analog comparators product line, engineered for high-accuracy voltage monitoring in power management, computing, and communications infrastructure where low quiescent current and rail-compatible inputs are critical.

FAQ

What is the maximum differential input voltage the AS339GTR-G1 can withstand?

The AS339GTR-G1 supports a differential input voltage of up to 40V, as specified in its Absolute Maximum Ratings. This allows safe operation even when one input is driven to ground while the other reaches the full 36V supply rail-critical for detecting overvoltage events in unregulated input stages without clamping diodes.

Can the AS339GTR-G1 operate with a 1.8V single supply?

No-the AS339GTR-G1 has a minimum single-supply voltage of 2.0V per its Recommended Operating Conditions. At 1.8V, internal biasing fails to activate the input stage transistors reliably, resulting in undefined output states and degraded propagation delay. For 1.8V systems, consider the AP331 or AP393 series.

Does the AS339GTR-G1 require external hysteresis for stable switching?

External hysteresis is not mandatory but strongly recommended for noisy input environments. The device has no internal hysteresis; adding a 100kΩ–1MΩ feedback resistor from output to non-inverting input creates 1–10mV of noise margin-essential for clean transitions in motor control feedback or AC zero-crossing detection.

Is the TSSOP-14 package of AS339GTR-G1 thermally enhanced?

No-the TSSOP-14 package has no thermal pad or exposed metal slug. Its junction-to-ambient thermal resistance is 125°C/W, limiting continuous power dissipation to ~60mW at +85°C ambient. For higher-power applications, use the SO-14 variant (89°C/W) or add copper pour under the package with thermal vias.