Diodes Incorporated AP7361C-15DR-13

Overview

AP7361C-15DR-13 from Diodes Incorporated is a 1A fixed-output (1.5V) ultra-low dropout linear regulator with enable, designed for power rail regulation in space-constrained and battery-sensitive systems. It delivers ±1% output accuracy, 360mV dropout at 1A (for 3.3V version; 1.5V variant exhibits ~600mV typical), 60µA quiescent current, and integrates thermal shutdown, fold-back short-circuit protection (400mA), and current limiting (1.5A). It is used in LCD-TV power supplies and set-top-box core logic rails.

For engineers reviewing the AP7361C-15DR-13 datasheet, AP7361C-15DR-13 pinout, AP7361C-15DR-13 application, or AP7361C-15DR-13 equivalent, key selection criteria include dropout voltage at 1.5V output, EN pin logic thresholds (VIH ≥1.0V, VIL ≤0.3V), thermal resistance of TO252 (DPAK)R package (95°C/W), stability with ≥2.2µF MLCC output capacitors, and compatibility with 2.2–6.0V input sources.

Technical Context

The AP7361C-15DR-13 implements a PMOS pass transistor architecture enabling ultra-low dropout operation 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 1.5V configuration - ensuring tight line and load regulation (±1.5% over full load range).

Enable control is implemented as a logic-high active input (EN) with 3.0MΩ internal pull-down, supporting direct microcontroller GPIO interfacing. Protection circuitry includes fold-back current limiting that reduces output current to ~400mA during short-circuit events and thermal shutdown activation at ~150°C junction temperature with 20°C hysteresis.

Key Specifications

Pinout & Package

AP7361C-15DR-13 is packaged in TO252 (DPAK)R - a 3-pin surface-mount power package with exposed thermal pad, optimized for thermal dissipation in high-current LDO applications. Pin assignments are standardized across Diodes' TO252 variants: Pin 1 = GND, Pin 2 = OUT, Pin 3 = IN.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7361C-15D-13, the DR variant offers inverted pinout (GND/OUT/IN) for improved routing in dense layouts; versus MCP1703T-1502E/MB, it delivers 6.7× higher output current and 10× lower quiescent current but requires tighter input voltage control.

Availability

AP7361C-15DR-13 is available at Aetrix Electronics and suitable for LCD-TV power management, set-top-box core logic, and home appliance MCU rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7361C-15DR-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 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 AP7361C belongs to Diodes' high-performance LDO family targeting space-constrained, battery-powered, and noise-sensitive applications - emphasizing ultra-low dropout, low IQ, and robust protection for next-generation portable and embedded systems.

FAQ

What is the maximum allowable input voltage for AP7361C-15DR-13?

The absolute maximum input voltage is 6.5V, but the recommended operating range is 2.2V to 6.0V. Exceeding 6.0V risks violating the device's safe operating area and may trigger thermal shutdown or degrade long-term reliability. For 1.5V output, minimum functional input is 2.1V (1.5V + 600mV dropout), making it ideal for single-cell Li-ion (2.7–4.2V) or regulated 3.3V/5V rails.

Does AP7361C-15DR-13 require an external resistor divider for 1.5V output?

No. The "-15" suffix indicates a factory-trimmed fixed 1.5V output; the ADJ pin is internally connected and functions as NC (no connection). External resistors are only required for adjustable versions (e.g., AP7361C-ADJ). Using a resistor divider on the -15 variant would disrupt regulation and is not supported.

How does the EN pin behave in AP7361C-15DR-13, and what are its voltage thresholds?

The EN pin is active-high with VIH ≥1.0V and VIL ≤0.3V. When pulled high (≥1.0V), the regulator enables and delivers 1.5V; when pulled low (≤0.3V), it enters shutdown mode drawing only 0.05µA. An internal 3.0MΩ pull-down ensures default-off behavior if left floating, eliminating need for external pull-down resistors in most designs.

Can AP7361C-15DR-13 be used with tantalum or aluminum electrolytic output capacitors?

Yes - the device is stable with MLCC, solid tantalum, polymer, and aluminum electrolytic capacitors ≥2.2µF. However, ceramic capacitors are preferred due to lower ESR, smaller footprint, and superior high-frequency noise filtering. If using electrolytics, ensure ESR remains within 10–100mΩ range per datasheet guidance to maintain phase margin and avoid oscillation.