Diodes Incorporated AP7361C-15SP-13

Overview

AP7361C-15SP-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 systems. It delivers ±1% output accuracy, 360mV dropout at 1A (for 3.3V variant; 1.5V dropout is 600mV typ), 60µA quiescent current, and integrates thermal shutdown, fold-back short-circuit protection (400mA), and current limit (1.5A). It supports stable operation with ≥2.2µF MLCC output capacitors and operates across –40°C to +85°C ambient.

For engineers reviewing the AP7361C-15SP-13 datasheet, AP7361C-15SP-13 pinout, AP7361C-15SP-13 application, or AP7361C-15SP-13 equivalent, key selection criteria include dropout voltage at 1.5V output, EN pin logic thresholds (VIH = 1.0V min), SO-8EP thermal resistance (100°C/W), PSRR (75dB @ 1kHz), and compatibility with low-ESR ceramic capacitors in portable and industrial power rails.

Technical Context

The AP7361C-15SP-13 implements a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR. Its internal 0.8V bandgap reference feeds an error amplifier that regulates output via feedback from the ADJ/NC pin - unused in fixed 1.5V configuration - ensuring tight line/load regulation (±0.2% max over temperature).

Enable control is implemented as a logic-high active input (VIH ≥ 1.0V) with 3.0MΩ internal pull-down; shutdown current is ≤0.05µA. Protection circuitry includes fold-back current limiting (triggers at ~400mA during short-circuit) and thermal shutdown at TJ ≈ 150°C with 20°C hysteresis, allowing safe recovery without external intervention.

Key Specifications

Pinout & Package

AP7361C-15SP-13 uses the SO-8EP (exposed pad) package, featuring an integrated thermal pad for enhanced heat dissipation (θJA = 100°C/W on FR-4 with recommended layout). Pin assignments are standardized across SO-8 variants per Diodes' datasheet DS37274 Rev. 5–2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-1502E/MB and TLS850B2LF33, AP7361C-15SP-13 uniquely balances 1A output, 600mV dropout at full load, and 60µA IQ in a thermally enhanced SO-8EP package - making it optimal for non-automotive industrial and consumer applications demanding high current density and low standby loss.

Availability

AP7361C-15SP-13 is available at Aetrix Electronics and suitable for smart home sensors, industrial HMIs, USB audio DACs, and set-top box memory rails requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for AP7361C-15SP-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-sensitive applications where ultra-low dropout, low IQ, and robust protection are essential - particularly in portable electronics and embedded systems with mixed-signal power requirements.

FAQ

What is the maximum allowable input voltage for AP7361C-15SP-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 safe operating area limits and may trigger thermal shutdown or degrade long-term reliability. For 1.5V output, minimum input is 2.1V (1.5V + 600mV dropout), making it compatible with single-cell Li-ion (2.7–4.2V) and dual alkaline (2.4–3.2V) sources.

Can AP7361C-15SP-13 operate without an output capacitor?

No - an output capacitor of at least 2.2µF ceramic is required for stability and transient response. The device is explicitly characterized and guaranteed stable only with ≥2.2µF MLCC, E-cap, Tan-cap, or solid capacitor. Omitting it causes oscillation, excessive output ripple, and potential thermal shutdown due to instability-induced power dissipation.

How does the EN pin behave when left unconnected?

When unconnected, the EN pin is pulled down internally via a 3.0MΩ resistor, holding it below 0.3V and keeping the regulator disabled. To enable operation, EN must be actively driven to ≥1.0V (e.g., tied to IN or controlled by a GPIO). Leaving EN floating is not recommended, as noise could cause unintended toggling; a deliberate tie to IN or GND is preferred for fixed ON/OFF states.

Is AP7361C-15SP-13 qualified for automotive applications?

No - AP7361C-15SP-13 is an industrial-grade part rated for –40°C to +85°C ambient. Diodes offers automotive-qualified versions (e.g., AP7361C-15QSP-13) with Q-suffix, AEC-Q100 qualification, PPAP capability, and IATF16949 manufacturing - but this specific part number lacks those certifications and should not be used in safety-critical automotive systems.