Diodes Incorporated AP1118S12L-13

Overview

AP1118S12L-13 from Anachip Corp. is a 1A positive low-dropout linear regulator with fixed 12V output, TTL/CMOS-compatible enable function, and 1.4V maximum dropout at full load. It delivers stable voltage for low-voltage ICs in VGA cards, PC peripherals, and communication modules using up to 18V input. The SOP-8L package supports surface-mount assembly with thermal shutdown and current limiting.

For engineers reviewing the AP1118S12L-13 datasheet, AP1118S12L-13 pinout, AP1118S12L-13 application, or AP1118S12L-13 equivalent, key selection criteria include dropout voltage under 1.4V at 1A, ±2% output voltage accuracy at 10mA, enable logic polarity (low-enable), thermal resistance of 150°C/W (junction-to-ambient, no heatsink), and compatibility with 10µF minimum output capacitance.

Technical Context

The AP1118S12L-13 uses a PNP pass transistor architecture with internal error amplifier and reference, enabling fast transient response and good noise rejection (60–70dB at 120Hz). Its enable input features an internal 100kΩ pull-down resistor, ensuring default-on operation when left floating.

It operates across 0°C to +150°C junction temperature, requires ≥13.5V input for 12V regulation, and guarantees load regulation of 100–120mV over 0–1A output current at 25°C. Thermal shutdown activates above +150°C junction temperature.

Key Specifications

Pinout & Package

SOP-8L package: 8-pin surface-mount plastic small-outline package with exposed pad (non-electrical), 1.27mm pitch, and thermal resistance θ_JA = 150°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD1117S12TR and TPS7A4701RGWR, the AP1118S12L-13 uniquely combines 1A current, 1.4V dropout, built-in enable, and SOP-8L footprint - making it optimal for legacy VGA and optical drive designs where pin compatibility and minimal external components are prioritized.

Availability

AP1118S12L-13 is available at Aetrix Electronics and suitable for VGA graphics card manufacturing, PC peripheral design, and optical drive production requiring stable component supply and long-term obsolescence management.

Supply support for AP1118S12L-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

Anachip Corp. is a Taiwan-based semiconductor company founded in 1996, specializing in analog and power management ICs for consumer and industrial markets.

The AP1118 product line targets cost-effective, robust LDO solutions for legacy computing and optical storage platforms, emphasizing ease of integration, thermal resilience, and wide-input-range operation.

FAQ

What is the minimum input voltage required for AP1118S12L-13 to regulate 12V output?

The minimum input voltage is 13.5V, defined by the 1.4V maximum dropout voltage specification at full 1A load. Below this, regulation fails and output drops linearly with input. Datasheet testing confirms stable 12V output only when VIN ≥ VOUT + 1.4V across the full operating temperature range.

Can AP1118S12L-13 operate without an output capacitor?

No. A minimum 10µF capacitor is mandatory between Vout and GND for stability, as specified in the Pin Descriptions section. Omitting it causes oscillation or thermal runaway due to phase margin loss in the internal control loop - verified by typical performance curves showing instability below 10µF.

Is the EN pin active-high or active-low?

The EN pin is active-low: logic low (≤0.8V) enables the output; logic high (≥1.6V) disables it. An internal 100kΩ pull-down resistor ensures default-enable behavior when the pin is left unconnected, confirmed in the Pin Descriptions and Electrical Characteristics tables.

What is the maximum power dissipation for AP1118S12L-13 in SOP-8L package at room temperature?

Maximum power dissipation is limited by thermal resistance: at 25°C ambient and θ_JA = 150°C/W, the device reaches thermal shutdown at ~1W (150°C rise × 1W = 150°C). Datasheet Note 2 states guaranteed max dissipation is 15W only under forced cooling - in standard SOP-8L layout, practical limit is ~0.8W continuous.