Diodes Incorporated AP2112M-1.2TRG1

Overview

AP2112M-1.2TRG1 from Diodes Incorporated is a fixed-output 1.2V, 600mA CMOS low-dropout linear regulator in SO-8 package with enable control, ±1.5% output accuracy, and auto-discharge (60Ω) on disable. It delivers stable power to core logic rails in space-constrained industrial controllers and embedded microprocessor subsystems requiring fast transient response and low noise.

For engineers reviewing the AP2112M-1.2TRG1 datasheet, AP2112M-1.2TRG1 pinout, AP2112M-1.2TRG1 application, or AP2112M-1.2TRG1 equivalent, key selection criteria include dropout voltage at 600mA (250mV typ. for 3.3V version; 400mV max. for 1.2V), thermal shutdown threshold (+160°C), EN logic thresholds (VIH ≥1.5V, VIL ≤0.4V), and compatibility with 1.0µF ceramic input/output capacitors.

Technical Context

This LDO employs a CMOS pass transistor architecture with internal bandgap reference and error amplifier, enabling high PSRR (−65dB at 100Hz/1kHz) and low quiescent current (55µA typ.). Its foldback short-circuit protection limits output current to 50mA during fault conditions while maintaining thermal shutdown at +160°C with +25°C hysteresis.

The device integrates an EN-controlled shutdown path that activates a 60Ω discharge resistor between VOUT and GND, ensuring rapid output decay when disabled. It operates across −40°C to +85°C ambient and supports input voltages from 2.5V to 6.0V, making it suitable for post-regulation of switched-mode supplies in multi-rail systems.

Key Specifications

Pinout & Package

AP2112M-1.2TRG1 is housed in a RoHS-compliant SO-8 package (JEDEC MS-012AC) with exposed thermal pad. Pin 1 is VOUT; pins 6 and 7 are GND; pin 8 is EN; pin 5 is NC; pin 4 is VIN; pin 2 is GND; pin 3 is NC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MCP1826T-1202E/DB and XC6210B122MR-G, AP2112M-1.2TRG1 offers superior thermal performance (θ_JA = 114°C/W), integrated discharge, and tighter output accuracy (±1.5% vs. ±2%), making it optimal for thermally dense, noise-sensitive, and sequenced-power designs.

Availability

AP2112M-1.2TRG1 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical patient monitor sensor interfaces, automotive body control modules, and network edge router management ASICs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AP2112M-1.2TRG1 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 automotive markets.

The AP2112 series targets high-efficiency, low-noise local regulation in multi-rail embedded systems-designed specifically for post-regulation of switching supplies where transient response, thermal resilience, and small-footprint packaging are critical.

FAQ

What is the minimum input voltage required for AP2112M-1.2TRG1 to regulate 1.2V at 600mA?

The datasheet specifies a minimum input voltage of 2.5V under recommended operating conditions. At 600mA load, the maximum dropout is 400mV, so VIN must be ≥1.6V to sustain regulation-but 2.5V is the guaranteed minimum per specification to ensure full performance across temperature and process variation.

Can AP2112M-1.2TRG1 be used with a 1.0µF aluminum electrolytic output capacitor?

Yes-the datasheet explicitly states stability with 1.0µF ceramic, tantalum, and aluminum electrolytic capacitors. Aluminum electrolytics must meet ESR requirements (typically <100mΩ) and be rated for ≥6.3V to ensure loop stability and avoid oscillation under load transients.

Does the EN pin have an internal pull-down resistor, and what is its value?

Yes-EN has an internal 3.0MΩ pull-down resistor, confirmed in the Electrical Characteristics table. This ensures the device remains disabled during power-up or when EN is left unconnected, eliminating risk of unintended activation in floating-control scenarios.

How does the auto-discharge function behave when EN is pulled low?

When EN is driven low (<0.4V), the internal 60Ω resistor connects VOUT directly to GND, discharging a 1.0µF output capacitor from 1.2V to <100mV in approximately 0.7ms (τ = R×C = 60Ω × 1µF). This prevents back-powering of upstream circuitry and supports clean power sequencing in multi-supply systems.