Diodes Incorporated AP2112R5A-2.5TRG1

Overview

AP2112R5A-2.5TRG1 from Diodes Incorporated is a fixed 2.5V, 600mA CMOS low-dropout linear regulator with enable control and auto-discharge functionality, delivering ±1.5% output accuracy, 250mV typical dropout at full load, and 50µVRMS output noise - deployed in portable computing power rails requiring stable low-noise bias for core logic or display subsystems.

For engineers reviewing the AP2112R5A-2.5TRG1 datasheet, AP2112R5A-2.5TRG1 pinout, AP2112R5A-2.5TRG1 application, or AP2112R5A-2.5TRG1 equivalent, key selection criteria include guaranteed 600mA output current, thermal shutdown at +160°C, EN logic compatibility (VIH ≥ 1.5V), SOT89-5 (R5A) package thermal resistance of 47°C/W, and stability with 1.0µF ceramic output capacitors.

Technical Context

The AP2112R5A-2.5TRG1 implements a CMOS-based LDO architecture with internal voltage reference, error amplifier, and PMOS pass transistor, enabling fast transient response and high PSRR (–65dB at 100Hz/1kHz). Its enable input controls both regulation and integrated 60Ω VOUT-to-GND discharge path during shutdown.

It operates across VIN = 3.5V to 6.0V (for 2.5V output), supports –40°C to +85°C ambient, and features foldback short-circuit protection (50mA limit), thermal shutdown with +25°C hysteresis, and ±100ppm/°C output voltage temperature coefficient.

Key Specifications

Pinout & Package

SOT89-5 package (R5A variant), 5-pin surface-mount, thermally enhanced leadframe with exposed pad (not electrically connected per datasheet); footprint compatible with JEDEC TO-243AA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2502E/MB, AP2112R5A-2.5TRG1 delivers double the output current and integrated discharge; versus TPS7A2025PDQNR, it trades 3.5µVRMS noise for guaranteed 60Ω discharge and broader input range (3.5V–6.0V vs. 1.6V–6.0V), simplifying system-level sequencing.

Availability

AP2112R5A-2.5TRG1 is available at Aetrix Electronics and suitable for laptop power management, LCD monitor bias rails, portable DVD logic supplies, and industrial HMI controllers requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AP2112R5A-2.5TRG1 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 consumer markets.

The AP2112 series belongs to Diodes' precision LDO portfolio, engineered for applications demanding tight output tolerance, fast transient response, and robust fault protection in space-constrained portable and embedded systems.

FAQ

What is the minimum input voltage required for AP2112R5A-2.5TRG1 to maintain regulation?

The recommended minimum input voltage is 3.5V, as specified in the Recommended Operating Conditions table for the AP2112-2.5 variant. At 600mA load, the 250mV typical dropout voltage means VIN must exceed 2.75V to sustain regulation - however, Diodes specifies 3.5V min to ensure performance across temperature, line, and load variations while meeting ±1.5% output accuracy.

Does AP2112R5A-2.5TRG1 require an external pull-up resistor on the EN pin?

No. The EN pin includes an internal 3.0MΩ pull-down resistor, ensuring the device remains disabled at power-up until a valid logic-high signal (≥1.5V) is applied. An external pull-up is unnecessary and may interfere with controlled sequencing; only an active drive (e.g., microcontroller GPIO) is needed to enable the regulator.

Can AP2112R5A-2.5TRG1 operate with a 10µF aluminum electrolytic output capacitor?

Yes. The datasheet explicitly states stability with ceramic, tantalum, and aluminum electrolytic capacitors ≥1.0µF. A 10µF aluminum electrolytic meets the ESR and capacitance requirements, though its higher ESR may slightly reduce transient response compared to ceramic - acceptable for non-critical bias rails where cost or size constraints favor electrolytic types.

Is the exposed pad on the SOT89-5 (R5A) package electrically connected?

No. Per the AP2112 package outline documentation and pin descriptions, the exposed pad in the SOT89-5 (R5A) variant is a thermal pad only and is not electrically connected to any internal node. It must be soldered to a thermal copper pour for heat dissipation but should not be tied to VIN, VOUT, or GND to avoid unintended shorts or leakage paths.