Diodes Incorporated AP7361C-12Y5-13

Overview

AP7361C-12Y5-13 from Diodes Incorporated is a 1A fixed-output (1.2V) ultra-low dropout linear regulator in SOT89-5 package with enable control, ±1% output accuracy, 360mV dropout at 1A (3.3V version), and 60µA quiescent current-designed for stable power delivery in battery-powered audio/video systems and LCD-TV power rails.

For engineers reviewing the AP7361C-12Y5-13 datasheet, AP7361C-12Y5-13 pinout, AP7361C-12Y5-13 application, or AP7361C-12Y5-13 equivalent, key selection criteria include dropout voltage at 1.2V output, EN logic thresholds (VIH=1.0V, VIL=0.3V), thermal shutdown threshold (150°C), PSRR (75dB @ 1kHz), and compatibility with ≥2.2µF MLCC output capacitors.

Technical Context

The AP7361C-12Y5-13 integrates a PMOS pass element, band-gap reference, error amplifier, and fold-back current limiting (400mA short-circuit clamp) with thermal shutdown hysteresis of 20°C. Its fixed 1.2V output eliminates external resistor divider requirements while maintaining stability across -40°C to +85°C ambient.

It operates from 2.2V to 6.0V input, delivers up to 1A load current, and achieves 75dB PSRR at 1kHz due to internal compensation optimized for ceramic output capacitors ≥2.2µF. The EN pin enables fast start-up (150µs typical) and low-shutdown current (0.05µA).

Key Specifications

Pinout & Package

SOT89-5 package: 5-pin thermally enhanced plastic outline with exposed pad (pin 4 = GND), matte tin-plated leads, solderable per MIL-STD-202 Method 208, weight ≈0.059g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-1202E/TO and TLS850F1BTV50, the AP7361C-12Y5-13 uniquely balances 1A capability, 60µA IQ, and SOT89-5 thermal performance for cost-sensitive consumer power rails-offering 3.3× higher current than the MCP1700 and 2× higher than the TLS850F1BTV50 without automotive overhead.

Availability

AP7361C-12Y5-13 is available at Aetrix Electronics and suitable for LCD-TV power management, set-top box subsystems, and portable media player core logic requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AP7361C-12Y5-13 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 devices, with emphasis on power management, signal integrity, and connectivity solutions for consumer, industrial, and automotive markets.

The AP7361C belongs to Diodes' high-performance LDO family designed for low-noise, low-dropout regulation in space-constrained portable and display electronics-prioritizing thermal efficiency, PSRR, and ease of integration over feature-rich programmability.

FAQ

What is the minimum input voltage required for AP7361C-12Y5-13 to regulate 1.2V output at 1A?

The minimum input voltage is determined by dropout: 600mV max at 1A, so VIN(min) = 1.2V + 0.6V = 1.8V. However, the datasheet specifies absolute minimum VIN as 2.2V for guaranteed operation across temperature and process variation-thus 2.2V is the practical lower limit for reliable 1A delivery.

Can AP7361C-12Y5-13 be used without connecting the EN pin?

Yes-EN can be tied directly to IN to maintain permanent operation. This is explicitly recommended in the datasheet for applications lacking enable control. Leaving EN floating is prohibited; it must be actively driven high or pulled up to IN to prevent erratic behavior due to noise coupling.

Is the SOT89-5 package thermally adequate for 1A continuous operation at 1.2V output?

Yes-the SOT89-5 has θJA = 150°C/W. At 1A and VIN = 3.3V, power dissipation is (3.3V − 1.2V) × 1A = 2.1W. With TA = 85°C, junction temperature reaches 85°C + (2.1W × 150°C/W) = 400°C-exceeding limits. Therefore, derating is required: max continuous IOUT at 3.3V input is ~500mA unless PCB copper area and thermal vias are added to reduce effective θJA.

Does AP7361C-12Y5-13 require an output capacitor, and what type is recommended?

Yes-an output capacitor ≥2.2µF is mandatory for stability. Ceramic (MLCC) is strongly recommended due to low ESR; the device is unstable with high-ESR types like standard aluminum electrolytics. Tantalum or polymer capacitors may be used if ESR is <100mΩ, but MLCC offers superior transient response and reliability.