Diodes Incorporated AP1117ID50G-13

Overview

AP1117ID50G-13 from Diodes Incorporated is a 1A low-dropout linear regulator with fixed 5.0V output, industrial-grade temperature range (−40°C to +125°C), 1.4V max dropout at 1A, and TO252 (DPAK) surface-mount package. It delivers stable voltage for logic supplies in VGA cards, PC peripherals, and communication modules where input supply ranges from 6.5V to 12V.

For engineers reviewing the AP1117ID50G-13 datasheet, AP1117ID50G-13 pinout, AP1117ID50G-13 application, or AP1117ID50G-13 equivalent, this page provides verified technical context, thermal resistance data (θJA = 73°C/W on 2oz FR-4), load regulation (±33mV), stability requirements (4.7µF MLCC output cap), and validated alternatives for industrial 5V LDO replacement.

Technical Context

The AP1117ID50G-13 integrates a precision 1.25V reference, current-limiting circuitry, and thermal shutdown protection into a single silicon die. Its internal architecture uses a PNP pass transistor with feedback control loop optimized for fast transient response and <0.04%/W thermal regulation.

It operates across −40°C to +125°C junction temperature, supports input voltages up to 18V DC, and maintains regulation with only 1.3V headroom at full 1A load-enabling efficient 5V generation from 6.5V–12V sources in space-constrained PCB layouts.

Key Specifications

Pinout & Package

AP1117ID50G-13 is housed in a lead-free, halogen-free TO252-3 (DPAK) package with exposed thermal tab connected to VOUT. The package supports surface-mount reflow assembly and requires minimum 5mm × 5mm copper pour under the tab for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD1117S50TR and TLV1117-50CDR, AP1117ID50G-13 uniquely combines industrial temperature range, TO252 thermal performance (73°C/W), and guaranteed 1A output at 1.4V dropout-making it the only drop-in solution for ruggedized 5V LDO applications requiring both reliability and layout compatibility.

Availability

AP1117ID50G-13 is available at Aetrix Electronics and suitable for industrial Ethernet PHY supplies, medical monitor logic rails, VGA card analog power, and other applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AP1117ID50G-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 connectivity applications.

The AP1117 series belongs to Diodes' precision linear regulator product line, engineered specifically for high-reliability industrial and computing applications demanding tight voltage tolerance, robust thermal behavior, and extended temperature operation.

FAQ

What is the minimum input voltage required for AP1117ID50G-13 to regulate at full 1A load?

The device requires VIN ≥ VOUT + 1.3V to maintain regulation at 1A, per datasheet Section 4 (Electrical Characteristics). With fixed 5.0V output, minimum valid input is 6.3V. At 6.5V input (per test condition for 5.0V models), dropout is guaranteed ≤1.4V, ensuring stable operation even with 200mV input sag during transients.

Can AP1117ID50G-13 be used with ceramic capacitors only, or is tantalum required?

It is fully compatible with 4.7µF X7R MLCCs (ESR ≤0.5Ω) on both input and output-no tantalum required. The datasheet explicitly states improved MLCC compatibility versus legacy '1117 regulators. Y5V dielectrics are prohibited due to capacitance drift; X7R or C0G ceramics are recommended for stable loop compensation.

How does the thermal shutdown behave during sustained overload?

When junction temperature reaches ~150°C, the internal thermal limiter disables the pass transistor, dropping VOUT to near zero. Once the die cools below ~140°C (typical hysteresis), regulation resumes automatically. This cycle repeats until fault condition clears-protecting the IC without requiring external reset circuitry.

Is the TO252 thermal tab electrically isolated from other pins?

No-the thermal tab is internally bonded to the VOUT pin (Pin 2), as confirmed in Pin Assignments (DS31009 p.2) and Package Outline Dimensions (p.10). PCB layout must treat the tab as a high-current 5V node: connect it directly to a dedicated 5V copper pour, not to ground or floating planes.