Diodes Incorporated AP1117D25G-13

Overview

AP1117D25G-13 from Diodes Incorporated is a 1A low-dropout linear regulator with fixed 2.5V output, TO252 (DPAK) surface-mount package, 1.4V max dropout at 1A, ±2% output voltage accuracy, and integrated thermal shutdown and current limiting. It delivers stable 2.5V supply for FPGA I/O banks, USB PHY power rails, and industrial sensor signal conditioning circuits.

For engineers reviewing the AP1117D25G-13 datasheet, AP1117D25G-13 pinout, AP1117D25G-13 application, or AP1117D25G-13 equivalent, key selection criteria include dropout voltage at full load, thermal resistance (θJA = 73°C/W on 2oz FR-4), minimum required output capacitance (4.7µF ceramic), load regulation (±25mV over 0–1A), and industrial-grade temperature range (–20°C to +125°C).

Technical Context

The AP1117D25G-13 implements a bandgap-referenced error amplifier driving an NPN pass transistor with internal current-limiting and thermal foldback circuitry. Its fixed 2.5V output is trimmed at wafer test using laser trimming of on-die resistors, eliminating external feedback components.

It operates across 4.0V to 12V input range while maintaining regulation down to 1.3V differential (VIN – VOUT), enabling use with 3.3V or 5V intermediate rails. Stability is guaranteed with 4.7µF X7R MLCC output capacitors (ESR ≤ 0.5Ω), supporting compact PCB layouts without tantalum or electrolytic dependencies.

Key Specifications

Pinout & Package

AP1117D25G-13 uses the TO252-3 (DPAK) surface-mount package with exposed thermal tab connected to VOUT. The package provides θJA = 73°C/W on standard 2oz FR-4 PCB with 5mm × 5mm copper pad, enabling 1A continuous operation without external heatsink under moderate ambient conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1117E25G-13, the TO252 package offers 32% lower θJA for equivalent PCB layout, enabling higher continuous current. Versus TLV1117-25CDCYR, AP1117D25G-13 provides verified –20°C operation, tighter load regulation (±25mV vs ±60mV), and guaranteed 1.4V dropout at 1A - critical for ruggedized embedded systems.

Availability

AP1117D25G-13 is available at Aetrix Electronics and suitable for industrial sensor nodes, FPGA-based PLCs, and portable medical diagnostics requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for AP1117D25G-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 solutions for power management, signal integrity, and protection applications.

The AP1117 series belongs to Diodes' precision linear regulator product line, engineered for high-current, low-noise, and thermally robust operation in industrial, computing, and communications infrastructure.

FAQ

What is the minimum input voltage required for AP1117D25G-13 to maintain regulation?

The device requires VIN ≥ VOUT + dropout voltage. With 2.5V output and maximum 1.4V dropout at 1A, minimum input is 3.9V. At lighter loads (e.g., 100mA), dropout drops to ~0.8V, allowing operation down to ~3.3V input - confirmed by Figure 1 in DS31009 Rev. 23-2.

Can AP1117D25G-13 be used with ceramic capacitors only?

Yes - it is explicitly qualified for 4.7µF X7R MLCC output capacitors (ESR ≤ 0.5Ω), unlike legacy 1117 regulators that require tantalum. Input capacitor must also be ≥4.7µF ceramic or solid tantalum; aluminum electrolytic is discouraged unless paralleled with 1µF MLCC.

Does AP1117D25G-13 support reverse polarity protection?

No - the device lacks internal reverse-voltage protection. Applying reverse bias to VIN or VOUT may cause latch-up or permanent damage. External protection (e.g., series Schottky diode on VIN) is required in systems with potential supply reversal, such as hot-swap or battery-backup configurations.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches ~150°C, the regulator disables output and enters hiccup mode: it remains off until die cools to ~135°C, then attempts restart. This cycle repeats autonomously - no external reset needed - protecting against solder joint fatigue and PCB delamination during fault conditions.