Diodes Incorporated AP7361-18D-13

Overview

AP7361-18D-13 from Diodes Incorporated is a 1A fixed-output (1.8V) ultra-low dropout linear regulator in TO252 package with enable control, 70µA quiescent current, and 500mV dropout at full load-designed for FPGA I/O power, laptop subsystems, and battery-powered devices requiring stable low-voltage rail regulation.

For engineers reviewing the AP7361-18D-13 datasheet, AP7361-18D-13 pinout, AP7361-18D-13 application, or AP7361-18D-13 equivalent, key selection criteria include dropout voltage at 1A, thermal shutdown threshold (150°C), EN logic thresholds (1.0V VIH), PSRR (65dB @ 1kHz), and compatibility with ≥2.2µF ceramic output capacitors.

Technical Context

The AP7361-18D-13 implements a PMOS pass transistor architecture with internal 0.8V bandgap reference and error amplifier, enabling fixed 1.8V output without external resistors. Its enable circuitry accepts logic-high input ≥1.0V to activate regulation and draws only 0.01µA leakage when disabled.

Thermal shutdown activates at 150°C junction temperature with 20°C hysteresis, while current limiting triggers at 1.1–1.5A depending on input voltage and temperature-ensuring robust fault protection during short-circuit or overload events across –40°C to +85°C ambient operation.

Key Specifications

Pinout & Package

AP7361-18D-13 uses the TO252 (DPAK) thermally enhanced surface-mount package with exposed thermal pad, optimized for PCB heat dissipation in high-current applications. Pin assignments are standardized per Diodes Inc. DS33626 Rev. 11-3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-1802E/MB and TLS850F1BTV50, AP7361-18D-13 uniquely balances 1A output, TO252 thermal capability, 70µA IQ, and industrial temperature range-making it optimal for high-density embedded computing where power, size, and efficiency intersect.

Availability

AP7361-18D-13 is available at Aetrix Electronics and suitable for server power subsystems, FPGA I/O bank supplies, laptop GPU memory rails, and portable medical sensor hubs requiring stable component supply with full traceability and lifecycle continuity.

Supply support for AP7361-18D-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 company specializing in discrete, analog, and mixed-signal solutions, with design centers across Asia, Europe, and the US, serving industrial, computing, and consumer markets.

The AP7361 series belongs to Diodes' high-performance LDO portfolio targeting power integrity in portable and embedded systems-designed specifically for applications demanding low dropout, fast transient response, and robust fault protection in compact packages.

FAQ

What is the minimum input voltage required for AP7361-18D-13 to maintain 1.8V output at 1A?

The minimum input voltage is 2.3V, calculated as VOUT + VDROPOUT = 1.8V + 0.5V. Below this, regulation fails and output voltage drops proportionally. The device supports down to 2.2V input but cannot sustain full 1A load at that level due to increased dropout-designers must verify worst-case VIN margin across temperature and tolerance.

Can AP7361-18D-13 be used with a 1µF output capacitor?

No-Diodes specifies a minimum 2.2µF ceramic output capacitor with 10–300mΩ ESR for guaranteed stability. Using 1µF risks oscillation or excessive overshoot during load transients, especially above 500mA. The datasheet explicitly states "stable with ceramic output capacitor ≥2.2µF" in Features and Application Information sections.

Does AP7361-18D-13 support adjustable output voltage?

No-AP7361-18D-13 is a fixed 1.8V output variant in TO252 package. Adjustable operation is only supported in U-DFN3030-8 and SOT89-5 packages (e.g., AP7361-ADJFGE-7 or AP7361-ADJY-13). The TO252 package lacks ADJ pin functionality and has no internal resistor divider option.

How does thermal shutdown behave under sustained overload?

When junction temperature reaches ~150°C, the output disables and remains off until temperature falls to ~130°C (20°C hysteresis). Under continuous overload, this causes thermal cycling-output pulses on/off at intervals determined by PCB thermal mass and airflow. This protects the die but may disrupt downstream logic; proper heatsinking or current derating is essential for steady-state operation.