Diodes Incorporated AP7361C-10D-13

Overview

AP7361C-10D-13 from Diodes Incorporated is a 1A fixed-output (1.0V) ultra-low dropout linear regulator with enable, designed for power rail regulation in space-constrained, battery-sensitive systems. It delivers ±1% output accuracy, 360mV dropout at 1A (for 3.3V variant; 1.0V variant dropout is 710mV typ. at 300mA), 60µA quiescent current, and integrates thermal shutdown, fold-back short-circuit protection (400mA), and current limiting (1.5A). It powers core logic rails in LCD-TVs and set-top boxes.

For engineers reviewing the AP7361C-10D-13 datasheet, AP7361C-10D-13 pinout, AP7361C-10D-13 application, or AP7361C-10D-13 equivalent, key selection criteria include dropout voltage at 1.0V output, EN pin logic thresholds (VIL ≤ 0.3V, VIH ≥ 1.0V), thermal resistance (95°C/W for TO252), stability with ≥2.2µF MLCC output capacitors, and compatibility with 2.2–6.0V input sources.

Technical Context

The AP7361C-10D-13 implements a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR (75dB @ 1kHz). Its internal 0.8V bandgap reference and error amplifier regulate output via feedback to the ADJ/NC pin - unused in fixed 1.0V configuration - ensuring tight load/line regulation (±1.0% for 1.2V–3.3V outputs; ±1.5% for 1.0V–1.2V).

Enable control is implemented as a logic-high active input (EN) with 3.0MΩ internal pull-down, supporting direct microcontroller GPIO interfacing. Protection functions operate autonomously: current limit triggers at 1.1–1.5A, short-circuit clamps to ~400mA, and thermal shutdown activates at ~150°C with 20°C hysteresis.

Key Specifications

Pinout & Package

AP7361C-10D-13 uses the TO252 (DPAK) package: 3-pin surface-mount with exposed thermal pad, rated for 1250mW dissipation. Pin 1 = IN, Pin 2 = GND, Pin 3 = OUT. The package provides robust thermal performance suitable for industrial ambient conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-1002E/MB and TLS850B2TE/V33, AP7361C-10D-13 uniquely balances 1A output capability, 60µA quiescent current, and TO252 thermal performance-making it optimal for cost-sensitive, high-reliability consumer electronics where both current and efficiency matter.

Availability

AP7361C-10D-13 is available at Aetrix Electronics and suitable for LCD-TV power rails, set-top box core logic, and smart home hub MCU core applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for AP7361C-10D-13 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AP7361C belongs to Diodes' high-performance LDO regulator product line, engineered specifically for consumer and industrial applications demanding ultra-low dropout, low IQ, and robust protection in compact packages.

FAQ

What is the minimum input voltage required for AP7361C-10D-13 to maintain 1.0V output at 1A?

The AP7361C-10D-13 requires VIN ≥ VOUT + VDROPOUT. At 1A and 1.0V output, typical dropout is 840mV (per datasheet Table 1, "VDROPOUT" row for 1.0V≤VOUT<1.1V, IOUT=1A). Thus, minimum VIN = 1.0V + 0.84V = 1.84V. However, the absolute minimum specified operating VIN is 2.2V per Recommended Operating Conditions - this ensures guaranteed performance across temperature and process variation.

Can AP7361C-10D-13 be used without connecting the EN pin?

No - the EN pin must be actively driven. In the TO252 (DPAK) package, EN functionality is present (unlike SOT223/TO252-R variants where it is omitted). Leaving EN floating risks undefined behavior. To enable permanently, tie EN directly to IN. Do not leave it open or connect only to a weak pull-up, as leakage may cause erratic turn-on/off cycling.

Is an output capacitor required, and what type is recommended?

Yes - a minimum 2.2µF ceramic capacitor (X5R/X7R) is required between OUT and GND for stability. The device is optimized for MLCCs; using solid tantalum or aluminum electrolytic capacitors is not recommended unless ESR is carefully matched per datasheet guidance. Larger values (e.g., 4.7µF–10µF) improve load transient response but are not mandatory for basic regulation.

How does thermal shutdown behave under sustained overload?

When junction temperature reaches ~150°C, thermal shutdown disables the pass element, dropping OUT to 0V. Once the die cools to ~130°C (20°C hysteresis), regulation resumes. Under continuous overload, this causes on/off cycling - visible as output voltage oscillation. This protects the IC but indicates inadequate heatsinking or excessive power dissipation; redesign with larger copper area or lower VIN is required for steady-state operation.