Diodes Incorporated AP1118D12L-13

Overview

AP1118D12L-13 from Anachip Corp. is a 1A positive low dropout fixed-mode linear regulator with 12V output, TTL/CMOS-compatible enable function, ≤1.4V dropout at full load, and TO252-5L (DPAK) package. It delivers stable 12V supply for high-speed bus termination and low-current logic circuits under input voltages up to 18V.

For engineers reviewing the AP1118D12L-13 datasheet, AP1118D12L-13 pinout, AP1118D12L-13 application, or AP1118D12L-13 equivalent, key selection factors include dropout voltage at 1A load, thermal shutdown behavior, EN logic polarity, output voltage tolerance (±2%), and SOA-limited power dissipation in TO252-5L.

Technical Context

The AP1118D12L-13 uses a PNP pass transistor architecture with internal current limiting and thermal shutdown circuitry. Its enable input features an internal ~100kΩ pull-down resistor, ensuring default-on operation when left floating.

It achieves fast transient response via internal compensation optimized for ≥10μF ceramic or tantalum output capacitance. Line regulation is specified at 0.2% over VIN = VOUT+1.5V to 18V, and load regulation remains ≤120mV across 0–1A output current at TJ = 25°C.

Key Specifications

Pinout & Package

AP1118D12L-13 is housed in a TO252-5L (DPAK) surface-mount package with exposed thermal pad (Tab = VOUT). The package supports moderate power dissipation (θJA = 102°C/W, no heatsink, still air) and requires PCB copper area for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC29152-12WT and LD1086DT12R, AP1118D12L-13 uniquely balances 1A capability, 1.4V dropout, integrated EN, and TO252-5L compactness - making it optimal for space-constrained, sequenced 12V systems where reliability and simplicity are prioritized over ultra-low dropout or ultra-high current.

Availability

AP1118D12L-13 is available at Aetrix Electronics and suitable for PC peripheral power, communication interface supply, and legacy system board regulation requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for AP1118D12L-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 specializing in analog and power management ICs, with focus on LDOs, DC/DC converters, and interface solutions since 1997.

The AP1118 series belongs to Anachip's fixed-output LDO product line, designed specifically for low-voltage IC supply in PC peripherals, communications equipment, and VGA subsystems where dropout, noise, and enable control are critical.

FAQ

What is the minimum input voltage required for AP1118D12L-13 to regulate at full 1A load?

The device requires VIN ≥ VOUT + dropout = 12V + 1.4V = 13.4V to maintain regulation at 1A. Below this, output voltage collapses linearly with input; datasheet guarantees regulation only above 13.5V for 12V version under test conditions.

Can AP1118D12L-13 be used without the EN pin connected?

Yes - the EN pin has an internal ~100kΩ pull-down resistor, so leaving it open defaults to logic-low (enabled state). No external pull-down is needed, though tying it to GND ensures deterministic startup in noisy environments.

Is the TO252-5L package thermally adequate for continuous 1A operation at 12V output?

At 12V out and 15V in (3V differential), power dissipation is 3W. With θJA = 102°C/W and TA = 70°C, junction rise is ~306°C - exceeding 150°C limit. A minimum 250mm² copper pour is required; derating to ≤600mA is recommended without heatsinking.

Does AP1118D12L-13 require input and output capacitors, and what types are validated?

Yes: ≥100μF input (aluminum/tantalum) and ≥10μF output (tantalum/ceramic) are mandatory for stability and transient response. Datasheet validates 100μF input + 10μF tantalum output; ceramic caps ≥10μF also work but may require series ESR ≥30mΩ for phase margin.