Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Diodes Incorporated AP1117T15L-U

Name: AP1117T15L-U
Brand: Diodes Incorporated
SKU: AP1117T15L-U
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AP1117T15L-U

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-220-3

Datasheet:: AP1117T15L-U.pdf

Description:: IC REG LINEAR 1.5V 1A TO220-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:824

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

AP1117T15L-U from Diodes Incorporated is a 1A low-dropout linear voltage regulator with fixed 1.5V output, TO220-3L package, 1.4V max dropout at full load, ±2% output voltage accuracy, and integrated thermal shutdown. It delivers stable power to low-voltage logic circuits such as 1.5V DDR termination, FPGA core supplies, and embedded microcontroller I/O rails in industrial control modules.

For engineers reviewing the AP1117T15L-U datasheet, AP1117T15L-U pinout, AP1117T15L-U application, or AP1117T15L-U equivalent, key selection criteria include dropout voltage under 1.4V at 1A, guaranteed thermal shutdown activation at 150°C, fixed 1.5V output tolerance (±2%), minimum load current of 5mA, and compatibility with 10µF tantalum output capacitors for stability.

Technical Context

The AP1117T15L-U implements a PNP pass transistor architecture with internal bandgap reference (1.25V nominal), error amplifier, and current-limit protection circuitry. Its fixed-output configuration eliminates external resistor networks, reducing BOM count and layout sensitivity.

It operates across 3.0V to 18V input range while maintaining regulation down to 1.3V VIN–VOUT differential. Fast transient response is enabled by internal compensation optimized for 10µF–22µF output capacitance with ESR between 0.15Ω and 20Ω.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.500V ±2% at 10mA, 25°C - ensures precise biasing for 1.5V DDR2/3 termination and low-voltage logic interfaces.
Dropout Voltage	Max 1.4V at 1A load - enables operation from 2.9V input to sustain 1.5V output in battery-backed or multi-rail systems.
Load Regulation	15mV over 0–1A load - maintains <1% output deviation during CPU/FPGA dynamic current bursts.
Ripple Rejection	60–70dB at 180Hz - suppresses switching noise from upstream DC/DC converters feeding the LDO input.
Thermal Resistance θ_JA	78°C/W (TO220-3L, FR-4, 2oz Cu) - requires minimal heatsinking for ≤1.2W dissipation at 1A with 3.5V input.
Quiescent Current	5–10mA minimum load requirement - ensures regulation stability without external pull-down resistors.
Shutdown Threshold	Junction temperature >150°C triggers automatic output disable - prevents permanent damage during sustained overload or poor airflow.

Pinout & Package

AP1117T15L-U uses TO220-3L package with exposed thermal tab electrically connected to VOUT. The tab must be mounted to a heatsink or copper pour for thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
1 (Adj/GND)	Ground reference terminal	Internally tied to GND for fixed-output variants; no external connection required - simplifies PCB routing and eliminates adjustment resistor errors.
2 (VOUT)	Regulated output terminal	Delivers 1.5V to load; tab is electrically connected to this pin - requires direct thermal coupling to PCB copper for heat dissipation.
3 (VIN)	Unregulated input terminal	Accepts 3.0–18V input; must remain ≥1.3V above VOUT to maintain regulation - mandates proper input bulk capacitance (≥10µF) near the pin.

Key Features

Feature	Design Value
Fixed 1.5V Output	Eliminates external feedback resistors, reducing component count and layout sensitivity for DDR termination applications.
1.4V Max Dropout @ 1A	Enables efficient conversion from 3.3V or 5V rails to 1.5V without requiring higher-input intermediate stages.
Integrated Thermal Shutdown	Self-protects against sustained overload or inadequate heatsinking by disabling output above 150°C junction temperature.
60–70dB Ripple Rejection	Attenuates switching noise from upstream buck converters, preserving signal integrity in mixed-signal FPGA/ASIC designs.
Lead-Free & RoHS Compliant	Meets EU Directive 2002/95/EC with green molding compound (no Br/Sb), supporting environmentally compliant manufacturing.

Applications

DDR Memory Termination

FPGA Core Supply

Use Scenario: Providing matched 1.5V termination voltage for DDR2/DDR3 memory buses on server motherboards and telecom line cards.

IC Role / Device Role / Timing Role: Fixed-output LDO delivering low-noise, tightly regulated 1.5V to parallel termination resistors (VTT rail).

Use Value: Maintains <±2% output accuracy across temperature and load, ensuring impedance matching and signal integrity at data rates up to 800MT/s.

Use Scenario: Powering FPGA I/O banks requiring clean 1.5V supply in industrial programmable logic controllers (PLCs).

IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling high-speed I/O transceivers from noisy system rails.

Use Value: 60–70dB ripple rejection suppresses switching noise from adjacent DC/DC converters, preventing bit errors in LVDS interfaces.

Embedded Microcontroller I/O

Industrial Sensor Interface

Use Scenario: Supplying 1.5V to ARM Cortex-M4 microcontroller GPIO banks interfacing with low-voltage analog sensors.

IC Role / Device Role / Timing Role: Stable local regulator isolating sensitive digital I/O from shared 3.3V system rail fluctuations.

Use Value: 15mV load regulation ensures consistent logic thresholds across 0–1A dynamic current swings, avoiding false edge detection.

Use Scenario: Biasing 1.5V reference inputs for precision ADCs in factory automation current-loop transmitters.

IC Role / Device Role / Timing Role: Low-drift voltage source for analog front-end signal conditioning stages.

Use Value: 0.5% temperature stability over –40°C to +125°C maintains ADC reference accuracy without calibration drift.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LD1117S15TR	1A rated, 1.5V fixed, SOT-223 package, 1.2V dropout typical, no thermal foldback	Suitable for space-constrained PCBs but lacks TO220 thermal mass for >0.8A continuous loads	Select when board area is critical and peak load ≤800mA; verify θ_JA = 107°C/W meets thermal budget.
TLV1117-15CDCYR	800mA rated, 1.5V fixed, SOT-223, 1.2V dropout, ±2% accuracy, lower quiescent current (5mA)	Better suited for ultra-low-power sensor nodes but insufficient for 1A DDR termination loads	Choose only for sub-800mA applications where 5mA quiescent current improves battery life; not drop-in for AP1117T15L-U's 1A role.

Compared with LD1117S15TR and TLV1117-15CDCYR, AP1117T15L-U uniquely combines 1A continuous output, TO220 thermal robustness, and guaranteed 1.4V max dropout - making it the only option among the three qualified for high-current, thermally demanding DDR termination and FPGA I/O supply roles.

Availability

AP1117T15L-U is available at Aetrix Electronics and suitable for DDR memory termination, FPGA I/O supply, and industrial sensor interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP1117T15L-U 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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for industrial, computing, and communications markets.

The AP1117 product line delivers cost-optimized, high-reliability LDO regulators targeting point-of-load power for memory interfaces, FPGA/ASIC I/O, and peripheral logic - emphasizing thermal robustness, low dropout, and fixed-output simplicity.

FAQ

What is the maximum input voltage for AP1117T15L-U?

The absolute maximum DC input voltage is 18V, but recommended operating range is 3.0V to 12V per datasheet conditions. Exceeding 12V increases power dissipation significantly - at 1A load and 18V input, power loss reaches 16.5W, exceeding safe thermal limits even with TO220 heatsinking.

Can AP1117T15L-U be used with ceramic output capacitors?

No - the AP1117T15L-U requires output capacitors with ESR between 0.15Ω and 20Ω for stability, as specified in the datasheet. Ceramic capacitors typically have ESR <10mΩ and will cause oscillation. Use tantalum or aluminum polymer capacitors (e.g., 10µF/6.3V with 0.5Ω ESR) instead.

Is the thermal tab of AP1117T15L-U electrically connected?

Yes - the metal tab on the TO220-3L package is internally connected to the VOUT pin. When mounting to a heatsink or PCB copper pour, ensure electrical isolation if the heatsink is grounded or at a different potential than the 1.5V output rail.

Does AP1117T15L-U require an input capacitor?

Yes - a minimum 10µF input capacitor (aluminum or tantalum) is required close to the VIN pin to prevent input voltage sag during load transients. Without it, the device may drop out momentarily under fast 0→1A load steps, causing system reset or data corruption.

AP1117T15L-U Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 18V

Voltage - Output (Min/Fixed):: 1.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 1.4V @ 1A

Current - Output:: 1A

Current - Quiescent (Iq):: 10 mA

Current - Supply (Max):: -

PSRR:: 60dB (180Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature

Operating Temperature:: 0°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

AP1117T15L-U FAQ

1.How can I place an order for AP1117T15L-U through Aetrix?

Please submit a Request for Quotation (RFQ) for AP1117T15L-U on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AP1117T15L-U reliable?

The price and inventory of AP1117T15L-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1117T15L-U is usually 5 days.

3.What payment methods are accepted for AP1117T15L-U?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1117T15L-U transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP1117T15L-U?

AP1117T15L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP1117T15L-U order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AP1117T15L-U?

For technical support, including AP1117T15L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1117T15L-U requirements.

6.How does Aetrix verify that AP1117T15L-U is sourced from the original manufacturer or authorized distributors?

All AP1117T15L-U products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AP1117T15L-U meets industry standards.

7.What is the process for return or replacement of AP1117T15L-U?

All AP1117T15L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1117T15L-U, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AP1117T15L-U part is unused and in its original packaging.

Return procedure for AP1117T15L-U:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-11 Comparator Circuit: Voltage Thresholds, Op-Amp Differences, LM393 and Practical Design

Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …