Diodes Incorporated AP7361C-12E-13

Overview

AP7361C-12E-13 from Diodes Incorporated is a 1A fixed-output (1.2V) ultra-low dropout linear regulator with enable, designed for power rail regulation in space-constrained portable and battery-powered systems. It delivers ±1% output accuracy, 360mV dropout at 1A (for 3.3V variant; 1.2V dropout is 600mV typ), 60µA quiescent current, and integrates thermal shutdown, fold-back short-circuit protection (400mA), and current limit (1.5A). It is used in LCD-TV power supplies and set-top-box core logic rails.

For engineers reviewing the AP7361C-12E-13 datasheet, AP7361C-12E-13 pinout, AP7361C-12E-13 application, or AP7361C-12E-13 equivalent, key selection criteria include dropout voltage at 1.2V output, EN pin logic thresholds (VIH = 1.0V min), stability with ≥2.2µF MLCC output capacitors, and thermal resistance of the SO-8EP package (θJA = 100°C/W).

Technical Context

The AP7361C-12E-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 1.2V configuration, where internal resistor divider sets VOUT.

Enable control is implemented as active-high logic with 1.0V minimum VIH and 0.3V maximum VIL; internal 3.0MΩ EN pull-down ensures default-off behavior when unconnected. Thermal shutdown activates at ~150°C with 20°C hysteresis, and fold-back current limiting reduces output to 400mA during short-circuit events.

Key Specifications

Pinout & Package

AP7361C-12E-13 is packaged in SO-8EP (exposed pad), a thermally enhanced 8-pin surface-mount package with GND-connected thermal pad on underside. Pin 1 is IN; Pin 2 is GND; Pin 3 is OUT; Pin 4 is NC; Pin 5 is EN; Pin 6 is NC; Pin 7 is NC; Pin 8 is GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1202E/MB and TLS850F1BTV50, the AP7361C-12E-13 uniquely balances 1A output, 600mV dropout at 1.2V, 60µA IQ, and SO-8EP thermal performance - making it optimal for space-limited, medium-power consumer electronics where automotive qualification is unnecessary.

Availability

AP7361C-12E-13 is available at Aetrix Electronics and suitable for LCD-TV panel bias supplies, set-top-box core logic rails, and smart home hub MCU power domains requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7361C-12E-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 components for power management, signal integrity, and connectivity applications.

The AP7361C belongs to Diodes' high-performance LDO regulator product line, engineered for low-noise, low-dropout power delivery in portable, consumer, and industrial electronics where efficiency, accuracy, and reliability are critical.

FAQ

What is the minimum input voltage required for AP7361C-12E-13 to maintain regulation at full 1A load?

The minimum input voltage is calculated as VOUT + VDROPOUT = 1.2V + 0.6V = 1.8V. However, the absolute minimum specified VIN is 2.2V per datasheet - this accounts for worst-case dropout variation, temperature drift, and line regulation margin. Operation below 2.2V is not guaranteed and may cause output collapse under load.

Can AP7361C-12E-13 be used without an external output capacitor?

No. The device requires a minimum 2.2µF ceramic capacitor between OUT and GND for stability, as confirmed in the Application Information section. Omitting it risks oscillation, poor transient response, and potential damage due to voltage overshoot during load steps. Tantalum or polymer capacitors ≥2.2µF are also acceptable per datasheet.

Is the EN pin internally pulled down on AP7361C-12E-13?

Yes. The EN pin has an internal 3.0MΩ pull-down resistor, ensuring the regulator remains disabled (high-impedance output) when the pin is left unconnected. This eliminates the need for an external pull-down in most applications, simplifying board design and reducing BOM count.

Does AP7361C-12E-13 require a minimum load current to maintain regulation?

No. The datasheet explicitly states "no minimum load is required to keep the device stable." The AP7361C-12E-13 remains regulated and stable from zero load up to 1A, making it suitable for systems with highly variable or intermittent loads such as wake-on-RF or sensor polling architectures.