Diodes Incorporated AS339MTR-E1

Overview

AS339MTR-E1 from Diodes Incorporated is a quad low-power, low-offset voltage comparator IC with 2.0 mV typical input offset voltage, 0.9 mA supply current, and open-collector outputs. It operates from single supplies (2.0 V to 36 V) or dual supplies (±1.0 V to ±18 V), supports rail-to-rail input common-mode range including ground, and is used in battery charger control circuits where precision threshold detection and low quiescent power are critical.

For engineers reviewing the AS339MTR-E1 datasheet, AS339MTR-E1 pinout, AS339MTR-E1 application, or AS339MTR-E1 equivalent, key selection considerations include input offset voltage tolerance, open-collector output drive capability, supply voltage flexibility, and SO-14 package thermal performance in space-constrained industrial power management designs.

Technical Context

The AS339MTR-E1 implements four independent PNP-input comparators with high DC gain (>200 V/mV) and fast response time (200 ns for 5 mV overdrive). Its input stage allows common-mode voltage down to ground and up to V_CC − 1.5 V, enabling direct sensing of low-side current shunts and battery voltage monitoring without level-shifting.

Each comparator features open-collector output capable of sinking 16 mA with 200 mV saturation voltage at 4 mA, supporting wired-OR logic, LED driving, and interface with TTL/CMOS loads. The device's low input bias current (25 nA typ.) and offset current (±5.0 nA typ.) minimize errors in high-impedance reference networks.

Key Specifications

Pinout & Package

AS339MTR-E1 is housed in a 14-pin SOIC (SO-14) package with 1.27 mm pitch, 8.75 mm × 3.90 mm body size, and 1.75 mm height. Thermal resistance is 89 °C/W (junction-to-ambient), supporting continuous operation at +85 °C ambient when properly mounted on FR-4 PCB with standard copper pour.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM339DR and TL331IDBVR, AS339MTR-E1 delivers optimal balance of precision (2.0 mV typ. offset), low power (0.9 mA), and integration (quad in SO-14), making it preferred for space-constrained, multi-rail industrial and computing power management where consistent channel matching matters.

Availability

AS339MTR-E1 is available at Aetrix Electronics and suitable for battery charger control, DC-DC module monitoring, and PC motherboard power sequencing requiring stable component supply and long-term industrial lifecycle support.

Supply support for AS339MTR-E1 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 power management, signal integrity, and protection solutions for industrial, computing, and communications markets.

The AS339 series belongs to Diodes' precision analog comparators product line, engineered specifically for robust, low-power voltage threshold detection in single-supply embedded systems where accuracy and supply flexibility are essential.

FAQ

Can AS339MTR-E1 operate from a 3.3 V supply?

Yes. AS339MTR-E1 supports single-supply operation from 2.0 V to 36 V, including 3.3 V nominal rails. At 3.3 V, input common-mode range extends from 0 V to 1.8 V, and output saturation remains below 200 mV at ≤4 mA sink - sufficient for driving 3.3 V logic with appropriate pull-up.

Does AS339MTR-E1 require external pull-up resistors on its outputs?

Yes. All four outputs are open-collector and must be pulled up to a valid logic high voltage (e.g., V_CC or another rail) via external resistors. Typical values range from 2.2 kΩ to 10 kΩ depending on speed and load capacitance; lower values improve rise time but increase static current.

What is the maximum input voltage allowed when V_CC = 5 V?

Per Absolute Maximum Ratings, differential input voltage may reach 40 V, and either input may swing to −0.3 V or +40 V regardless of V_CC. However, recommended operation limits input voltage to 0 V–3.5 V (V_CC − 1.5 V) for linear comparator function; beyond that, inputs remain undamaged but output behavior is undefined.

Is AS339MTR-E1 pin-compatible with industry-standard LM339?

Yes. AS339MTR-E1 is explicitly designed as a drop-in replacement for LM339 in SO-14 packages, sharing identical pinout, electrical interface, and functional behavior. It improves upon LM339 with tighter offset voltage (2.0 mV vs. 3.0 mV typ.) and lower supply current (0.9 mA vs. 1.6 mA typ.).