Diodes Incorporated AS324MTR-E1

Overview

AS324MTR-E1 from Diodes Incorporated is a low-power quad operational amplifier designed for single-supply operation (3V to 36V) with rail-to-rail input common-mode range including ground, 100 dB typical open-loop gain, 2 mV typical input offset voltage, and 0.5 mA typical supply current per amplifier. It serves as a general-purpose signal conditioning IC in battery-powered and industrial analog circuits.

For engineers reviewing the AS324MTR-E1 datasheet, AS324MTR-E1 pinout, AS324MTR-E1 application, or AS324MTR-E1 equivalent, key selection criteria include input offset voltage tolerance (2–5 mV), output swing capability (0 V to V_CC − 1.5 V), channel separation (−120 dB), thermal resistance (91 °C/W θ_JA in SO-14), and RoHS-compliant lead-free packaging.

Technical Context

The AS324MTR-E1 integrates four independent, internally frequency-compensated op-amps optimized for unity-gain stability. Its input stage supports common-mode voltages down to ground and up to V_CC − 1.5 V, enabling direct interfacing with sensors and microcontroller ADCs without level-shifting.

Each amplifier delivers 40 mA sourcing and 15 mA sinking output current at V_CC = 15 V, with large-signal voltage gain ≥85 dB across −40°C to +85°C and PSRR of 70–100 dB over 5–30 V supply range - making it suitable for noisy industrial power rails.

Key Specifications

Pinout & Package

AS324MTR-E1 is packaged in a 14-pin SOIC (SO-14) surface-mount package with standard industry footprint (JEDEC MS-012), 1.27 mm pitch, and 8.75 mm × 3.9 mm body dimensions. Thermal resistance is θ_JA = 91 °C/W and θ_JC = 18 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM324DR and TLV2464IDR, AS324MTR-E1 uniquely balances wide supply range (3–36 V), ground-sensing input, low offset (2 mV), and industrial temperature support (−40°C to +85°C) - making it the only option for robust, single-supply analog front-ends in battery chargers and industrial SMPS.

Availability

AS324MTR-E1 is available at Aetrix Electronics and suitable for battery charger monitoring, industrial sensor signal conditioning, cordless telephone audio front-ends, and DC power supply feedback control requiring stable component supply across automotive and industrial temperature ranges.

Supply support for AS324MTR-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, cost-optimized components for industrial, computing, and consumer markets.

The AS324 series belongs to Diodes' precision analog amplifier product line, engineered specifically for single-supply, low-power, multi-channel signal conditioning in space- and energy-constrained systems.

FAQ

Is AS324MTR-E1 pin-compatible with legacy LM324 variants?

Yes, AS324MTR-E1 uses the standard 14-pin SOIC footprint and pinout defined for industry-standard quad op-amps (e.g., LM324, TLC274). All input, output, supply, and ground terminals match identically - enabling drop-in replacement without PCB redesign. However, its wider supply range (3–36 V vs. LM324's 3–32 V) and lower input offset (2 mV vs. 7 mV) provide functional improvements in existing designs.

What is the maximum capacitive load the AS324MTR-E1 can drive stably?

The AS324MTR-E1 is internally compensated for unity-gain stability and can drive up to 100 pF capacitive loads without oscillation when configured as a voltage follower. For loads exceeding 100 pF (e.g., long cables or ADC input capacitance), a 10–100 Ω isolation resistor should be placed in series with the output to maintain phase margin - verified in Diodes' DS36827 Figure 12 (pulse response with 100 pF).

Does AS324MTR-E1 support dual-supply operation?

Yes, AS324MTR-E1 operates with split supplies from ±1.5 V to ±18 V. The input common-mode range extends to within 1.5 V of either rail, and output swing reaches within 1.5 V of each supply. This allows use in traditional bipolar signal chains (e.g., audio preamps, test equipment) while retaining the same low 0.5 mA per-amplifier supply current as in single-supply mode.

How does the AS324A variant differ from AS324 in AS324MTR-E1?

AS324MTR-E1 corresponds to the standard AS324 grade (not AS324A), with input offset voltage specified at 2 mV typical / 5 mV maximum. The AS324A variant tightens this to 2 mV typical / 3 mV maximum and is only offered in SO-14 - but AS324MTR-E1 itself is the standard-grade part. No functional or pinout differences exist between AS324 and AS324A beyond the tighter offset specification.