Diodes Incorporated AP7333-30SRG-7

Overview

AP7333-30SRG-7 from Diodes Incorporated is a 300mA fixed-output (3.0V) low-dropout linear regulator in SOT23R package, featuring 65µA quiescent current, 300mV typical dropout at full load, 65dB PSRR at 100Hz, and stable operation with 1µF ceramic output capacitor. It serves as a primary power supply for battery-powered digital subsystems requiring fast transient response and ultra-low standby power.

For engineers reviewing the AP7333-30SRG-7 datasheet, AP7333-30SRG-7 pinout, AP7333-30SRG-7 application, or AP7333-30SRG-7 equivalent, key selection criteria include dropout voltage under 300mA load, thermal shutdown threshold (140°C), load regulation (±0.6%), start-up time (80µs), and compatibility with 1µF low-ESR ceramic output capacitors in space-constrained portable designs.

Technical Context

The AP7333-30SRG-7 integrates a PMOS pass element, precision band-gap reference, error amplifier, and protection circuitry (current limit, short-circuit, thermal shutdown) in a single die. Its architecture enables stable regulation without minimum load and supports input voltages from 2V to 6V while maintaining 2% output accuracy across –40°C to +85°C ambient.

Designed for fast transient response, it delivers <100mV undershoot/overshoot during 0–300mA load steps with 1µF output capacitance and exhibits 0.01–0.20%/V line regulation. The SOT23R package provides 230°C/W junction-to-ambient thermal resistance and supports tape-and-reel delivery (3000 units/reel).

Key Specifications

Pinout & Package

SOT23R package: 3-pin surface-mount, RoHS-compliant, green molding compound, 230°C/W θJA, footprint per Diodes AP02001 pad layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO applications.

Compared with MCP1700-3002E/TO and TPS7333QDBVRQ1, the AP7333-30SRG-7 uniquely balances 300mA capability, 65µA IQ, and SOT23R's optimized thermal performance for cost-sensitive consumer electronics where space and standby power are critical but automotive qualification is unnecessary.

Availability

AP7333-30SRG-7 is available at Aetrix Electronics and suitable for wireless LAN modules, XDSL router power rails, and battery-powered keyboards requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AP7333-30SRG-7 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 consumer, industrial, and computing markets.

The AP7333 series belongs to Diodes' low-quiescent-current LDO portfolio, engineered specifically for portable and battery-operated equipment where extended runtime, fast dynamic response, and minimal PCB footprint are design priorities.

FAQ

What is the recommended input capacitor for AP7333-30SRG-7?

A minimum 1µF X7R or X5R ceramic capacitor is required between IN and GND, placed as close as possible to the device. Larger values improve high-frequency noise rejection, and low-ESR types (<100mΩ) enhance stability. No upper capacitance limit applies, but physical placement remains critical for noise immunity.

Does AP7333-30SRG-7 require an output capacitor to operate?

Yes - a 1µF to 4.7µF X7R/X5R ceramic capacitor with 10–200mΩ ESR is mandatory for stability and transient response. The device is not stable without it. Unlike some LDOs, it does not require a minimum ESR, enabling use of modern low-ESR MLCCs without series resistance.

How does thermal shutdown behave under continuous overload?

When junction temperature reaches ~140°C, the output disables; it re-enables once temperature falls to ~125°C. Under sustained overload, this causes on/off cycling - a protective behavior that limits average power dissipation and prevents permanent damage, though system-level undervoltage may occur.

Can AP7333-30SRG-7 be used with a 1.8V input to deliver 3.0V output?

No - the absolute minimum input voltage is 2.0V, and the 300mV dropout specification requires VIN ≥ 3.3V to maintain 3.0V output at 300mA. At 1.8V input, the device cannot regulate and will enter dropout, causing uncontrolled output collapse below nominal voltage.