Diodes Incorporated AP1117Y50G-13

Overview

AP1117Y50G-13 from Diodes Incorporated is a 1A low-dropout linear regulator in SOT89-3 package, fixed 5.0V output, with 1.4V max dropout at full load, ±2% output voltage accuracy, and thermal shutdown protection. It delivers stable 5V supply for logic circuits, PC peripherals, and communication modules operating from 6.5–12V input.

For engineers reviewing the AP1117Y50G-13 datasheet, AP1117Y50G-13 pinout, AP1117Y50G-13 application, or AP1117Y50G-13 equivalent, key selection criteria include dropout voltage at 1A load, thermal resistance (θJA = 164°C/W), output stability with 4.7µF MLCC, junction temperature range (0°C to +125°C), and RoHS-compliant lead-free SOT89-3 packaging.

Technical Context

The AP1117Y50G-13 implements a bandgap-referenced error amplifier driving a PNP pass transistor, enabling precise 5.0V regulation across line (±0.2%) and load (±50mV) variations. Its internal current limiting and thermal shutdown circuitry activate at 150°C junction temperature and >1.1A output current.

Designed for fixed-output operation, it eliminates external feedback resistors-pin 1 is grounded (GND), pin 2 is VOUT (5.0V), and pin 3 is VIN. Stability requires minimum 4.7µF ceramic or tantalum output capacitance with ESR ≤0.5Ω placed within 10mm of the device.

Key Specifications

Pinout & Package

SOT89-3 package: surface-mount, 3-pin, thermally enhanced plastic case with exposed tab connected to VOUT for PCB heat spreading. Pin 1 (Adj/GND) is grounded for fixed-mode operation; pin 2 (VOUT) supplies regulated 5.0V; pin 3 (VIN) accepts 6.5–12V input. Tab must be soldered to ≥25mm² copper pour 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 TLV1117-50CDCYR, AP1117Y50G-13 offers superior thermal resistance (164°C/W), guaranteed 1.4V dropout at full 1A, and halogen-free compliance-making it optimal for space-constrained commercial PC peripherals where reliability and regulatory alignment are prioritized over ultra-low IQ.

Availability

AP1117Y50G-13 is available at Aetrix Electronics and suitable for PC peripheral power, USB interface logic, VGA card regulation, and industrial sensor interface applications requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.

Supply support for AP1117Y50G-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 company specializing in discrete, analog, and mixed-signal devices, with design centers in US, Germany, Taiwan, and China, serving industrial, computing, and consumer markets.

The AP1117 series belongs to Diodes' high-reliability linear regulator product line, engineered specifically for low-noise, low-dropout power delivery in space-constrained PC and communications equipment where thermal efficiency and regulatory compliance are critical.

FAQ

What is the minimum input voltage required for AP1117Y50G-13 to maintain regulation at 1A load?

The AP1117Y50G-13 requires VIN ≥ VOUT + dropout voltage. With a guaranteed maximum dropout of 1.4V at 1A and 5.0V output, the minimum input is 6.4V. Operation below this causes output collapse; datasheet specifies 6.5V minimum for 5.0V version under test conditions to ensure margin.

Can AP1117Y50G-13 be used with ceramic capacitors, and what ESR range is acceptable?

Yes-AP1117Y50G-13 is explicitly qualified for MLCC use. The datasheet mandates output capacitance ≥4.7µF with ESR between 0.15Ω and 0.5Ω. X7R dielectric is recommended; Y5V is prohibited due to capacitance drift. Input capacitor also requires ≥4.7µF and ESR ≤0.5Ω.

Does AP1117Y50G-13 require an external resistor divider for 5V operation?

No. AP1117Y50G-13 is a fixed-output variant: pin 1 (Adj) is internally connected to GND and must be externally grounded. No external resistors are needed-unlike the adjustable AP1117-ADJ version, which uses pins 1 and 2 to set VOUT via R1/R2.

How does thermal shutdown behave, and can the device auto-recover?

Thermal shutdown activates at ~150°C junction temperature, disabling the output. Once the die cools to ~140°C, regulation resumes automatically-no reset or power cycle required. This hiccup-mode behavior protects against sustained overloads while maintaining system uptime during transient thermal events.