Diodes Incorporated AP2127N-3.0TRG1

Overview

AP2127N-3.0TRG1 from Diodes Incorporated is a 300mA, 3.0V fixed-output CMOS low-dropout (LDO) regulator in SOT-23 package, featuring 170mV dropout at 300mA, ±2% output voltage accuracy, and 60μVRMS output noise - designed for power-sensitive applications including notebook CPU core logic and datacom interface rails.

For engineers reviewing the AP2127N-3.0TRG1 datasheet, AP2127N-3.0TRG1 pinout, AP2127N-3.0TRG1 application, or AP2127N-3.0TRG1 equivalent, key selection criteria include dropout performance under 300mA load, thermal behavior in SOT-23, shutdown-controlled auto-discharge (60Ω), and compatibility with 1μF ceramic input/output capacitors.

Technical Context

The AP2127N-3.0TRG1 uses a PMOS pass transistor architecture enabling ultra-low quiescent current (60μA typical) and low-noise regulation without requiring external compensation. Its internal 0.8V reference and precision trimming deliver ±2% output accuracy across -40°C to +85°C ambient.

It integrates active shutdown control with 0.1μA standby current, thermal shutdown at +165°C with +30°C hysteresis, and short-circuit current limiting at 50mA - all operating within 2.5V–6V input range while maintaining stable regulation down to 170mV headroom at full load.

Key Specifications

Pinout & Package

SOT-23 package (3-pin, lead-free, RoHS-compliant) with exposed pad not present - optimized for space-constrained portable PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3002E/TT and TPS7A2030PDQNR, the AP2127N-3.0TRG1 delivers superior noise performance (60 vs. 65–110μVRMS) and tighter output accuracy (±2% vs. ±3%), making it optimal for precision analog and high-speed digital loads where stability and spectral purity are prioritized over ultra-low IQ or automotive qualification.

Availability

AP2127N-3.0TRG1 is available at Aetrix Electronics and suitable for notebook platform controller hubs, mobile baseband I/O rails, and datacom transceiver biasing requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AP2127N-3.0TRG1 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 ICs for power management, signal integrity, and connectivity applications.

The AP2127 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for battery-powered and noise-sensitive systems demanding low dropout, ultra-low noise, and minimal quiescent current in compact packages.

FAQ

What is the minimum input voltage required for AP2127N-3.0TRG1 to maintain regulation at 300mA?

The AP2127N-3.0TRG1 requires VIN ≥ VOUT + VDROP = 3.0V + 0.17V = 3.17V to sustain 300mA output current while maintaining regulation. Below this, output voltage drops linearly with input; the absolute minimum VIN is 2.5V, but usable output current decreases significantly below 3.17V.

Can AP2127N-3.0TRG1 be used with a 10μF output capacitor?

Yes - the AP2127N-3.0TRG1 is stable with ceramic capacitors ≥1μF and does not require ESR tuning. A 10μF X7R MLCC improves transient response and reduces output voltage undershoot during load steps, especially in systems with dynamic current demands like microcontroller burst modes.

Does AP2127N-3.0TRG1 support reverse current blocking?

No - the AP2127N-3.0TRG1 uses a PMOS pass device that inherently blocks reverse current from VOUT to VIN when VIN is removed or falls below VOUT. This prevents backfeeding into upstream supplies and eliminates need for external blocking diodes in battery backup paths.

Is the shutdown pin active-high or active-low?

The shutdown (SHDN) pin is active-high: applying ≥1.5V to SHDN enables regulation; pulling SHDN ≤0.5V disables output and activates auto-discharge. The internal pull-down resistance is 3MΩ, so an open SHDN defaults to OFF state - critical for fail-safe power sequencing.