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

Diodes Incorporated AP1117K25L-13

Name: AP1117K25L-13
Brand: Diodes Incorporated
SKU: AP1117K25L-13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP1117K25L-13

Manufacturer:: Diodes Incorporated

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

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: AP1117K25L-13.pdf

Description:: IC REG LINEAR 2.5V 1A TO263-2

Quantity:: RFQ Add To RFQ list

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Inventory:1,352

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Product details

Overview

AP1117K25L-13 from Diodes Incorporated is a 1A low-dropout linear voltage regulator in fixed 2.5V output mode, housed in TO263-3L surface-mount package. It delivers stable 2.5V at up to 1A load with ≤1.4V dropout at full current, supports input voltages from 4V to 18V, and integrates thermal shutdown and current limiting - used in VGA cards, PC peripherals, and 2.5V logic supply rails.

For engineers reviewing the AP1117K25L-13 datasheet, AP1117K25L-13 pinout, AP1117K25L-13 application, or AP1117K25L-13 equivalent, key selection criteria include dropout voltage under 1A load, thermal resistance (θ_JA = 60°C/W), fixed-output accuracy (±2%), ripple rejection (60–70dB), and compatibility with 10µF minimum output capacitance.

Technical Context

The AP1117K25L-13 implements a PNP pass transistor architecture with internal bandgap reference and error amplifier, enabling fast transient response and stable regulation across 0–125°C junction temperature range. Its fixed 2.5V output eliminates external resistor networks required by adjustable variants.

Designed for low-noise, low-ESR applications, it requires only a 10µF tantalum or ceramic output capacitor (0.15–20Ω ESR) and tolerates input-to-output differentials as low as 1.3V while maintaining regulation - making it suitable for post-regulation of switched-mode supplies or battery-powered 3.3V/5V-derived rails.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.500 V ±2% (2.45–2.55 V) at 10 mA, 25°C - ensures compatibility with 2.5V I/O standards and analog front-ends.
Dropout Voltage	1.4 V max at 1 A load - enables operation from 3.9V input (e.g., buck converter + LDO cascade) while sustaining 2.5V output.
Load Regulation	20–25 mV over 0–1 A load (VIN = 4 V) - maintains tight output stability during dynamic CPU or FPGA core current transients.
Ripple Rejection	60–70 dB at 180 Hz - suppresses switching noise from upstream DC/DC converters feeding sensitive analog circuitry.
Thermal Resistance θ_JA	60 °C/W (TO263-3L, FR-4, 2 oz Cu, no airflow) - allows ~1.5 W continuous dissipation before thermal shutdown at 25°C ambient.
Current Limit	1.1 A min - provides robust short-circuit protection without latch-up, supporting safe fault recovery in embedded systems.
Quiescent Current	5–10 mA minimum load requirement - ensures regulation integrity even under light-load conditions typical in standby modes.

Pinout & Package

AP1117K25L-13 uses the TO263-3L (D²PAK) thermally enhanced surface-mount package with exposed thermal tab electrically connected to VOUT. The tab serves as both heatsink and output terminal, requiring proper PCB copper pour for thermal management.

Pin/Terminal	Circuit Role	Design Meaning
1 (Adj/GND)	Ground reference (fixed-mode only)	Internally tied to ground for fixed 2.5V version; must be connected to system GND with low-impedance path.
2 (VOUT)	Regulated output	Delivers 2.5V to load; also connected to thermal tab - requires ≥10 µF output capacitor (0.15–20 Ω ESR) for stability.
3 (VIN)	Unregulated input	Accepts 4–18 V DC; must remain ≥1.3 V above VOUT to sustain regulation - decoupling capacitor recommended.

Key Features

Feature	Design Value
Low dropout voltage	1.4 V max at 1 A - enables high-efficiency regulation from marginal input sources like partially discharged batteries or cascaded SMPS outputs.
Integrated thermal shutdown	Activates at ~150°C junction temperature - prevents permanent damage during overload or poor heatsinking, auto-recovering upon cooldown.
Fast transient response	Stabilizes within microseconds after load steps - critical for powering digital ICs with burst current demands (e.g., FPGAs, microcontrollers).
High ripple rejection	60–70 dB at 180 Hz - effectively filters residual switching noise from upstream DC/DC converters in mixed-signal systems.
Lead-free & RoHS compliant	Meets EU Directive 2002/95/EC with green molding compound (no Br/Sb) - supports environmental compliance for industrial and consumer products.

Applications

VGA Graphics Card Power

PC Peripheral Logic Supply

Use Scenario: Providing clean 2.5V rail to GPU memory interface and display controller logic on discrete graphics cards.

IC Role / Device Role / Timing Role: Post-regulator delivering low-noise, tightly regulated 2.5V from a higher-voltage SMPS output.

Use Value: Maintains signal integrity and timing margin for DDR memory interfaces operating at 2.5V I/O voltage with <±25 mV load regulation.

Use Scenario: Powering USB hub controllers, SATA bridge ICs, and PCIe switch logic in desktop motherboard add-in peripherals.

IC Role / Device Role / Timing Role: Fixed-output LDO supplying stable 2.5V to high-speed serial interface PHYs and configuration logic.

Use Value: Delivers 1A peak current with <1.4V dropout, enabling compact board layout without oversized input capacitors.

Industrial Sensor Signal Chain

Embedded Microcontroller Core Rail

Use Scenario: Generating precision 2.5V reference and analog supply for 12-bit ADCs, op-amps, and RTD signal conditioning circuits.

IC Role / Device Role / Timing Role: Low-noise analog power source with 60–70 dB ripple rejection to minimize quantization error.

Use Value: Ensures <0.5% output drift over –40°C to +125°C, preserving measurement accuracy in uncontrolled environments.

Use Scenario: Supplying 2.5V core voltage to ARM Cortex-M4/M7 microcontrollers with variable processing loads in motor control modules.

IC Role / Device Role / Timing Role: Primary linear regulator for MCU VDDCORE, handling rapid current transients during PWM bursts.

Use Value: Fast transient response and 1.1A current limit prevent brown-out resets during 100 ns–1 µs load steps.

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
LD1117S25TR	1A fixed 2.5V LDO in SOT-223; higher θ_JA (107°C/W), lower PSRR (55 dB @ 120 Hz)	Better suited for space-constrained boards where thermal mass is limited; less effective for high-noise SMPS inputs	Select when footprint size is prioritized over thermal performance and noise rejection.
TLV1117-25CDR	1A fixed 2.5V LDO in SOT-223; wider input range (up to 15 V), but higher dropout (1.2 V typ @ 800 mA)	Lower quiescent current (5 mA vs 10 mA), but reduced headroom for low-input designs	Prefer when input voltage is tightly bounded below 15 V and ultra-low IQ matters more than dropout margin.

Compared with LD1117S25TR and TLV1117-25CDR, AP1117K25L-13 offers superior thermal performance (60°C/W vs >100°C/W), higher ripple rejection, and guaranteed 1.4V dropout at full 1A - making it optimal for thermally demanding, noise-sensitive 2.5V rail applications in TO263-3L layouts.

Availability

AP1117K25L-13 is available at Aetrix Electronics and suitable for VGA graphics cards, PC peripheral logic supplies, industrial sensor signal chains, and embedded microcontroller core rails requiring stable component supply with lead-free compliance and thermal reliability.

Supply support for AP1117K25L-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 and manufacturing operations across Asia and the Americas.

The AP1117 product line targets cost-sensitive, high-volume power management applications in computing, communications, and industrial electronics - emphasizing low dropout, thermal robustness, and RoHS-compliant packaging.

FAQ

What is the minimum input voltage required for AP1117K25L-13 to maintain regulation?

The device requires VIN ≥ VOUT + 1.3 V to regulate properly, so minimum input is 3.8 V. At full 1 A load, dropout rises to 1.4 V, meaning 3.9 V input is recommended for margin. Input below this threshold causes output collapse or unregulated behavior.

Can AP1117K25L-13 be used with ceramic output capacitors?

Yes - it supports ceramic capacitors with ESR between 0.15 Ω and 20 Ω. A 10 µF X5R/X7R ceramic capacitor meeting these ESR limits ensures stability. Avoid ultra-low-ESR types (<0.1 Ω) unless compensated per Diodes Inc. AN-101 guidelines.

Is the thermal tab of AP1117K25L-13 electrically isolated?

No - the thermal tab is internally connected to the VOUT pin. PCB layout must treat the tab as part of the 2.5V output net, using a dedicated copper pour tied to VOUT with multiple thermal vias to inner layers for heat dissipation.

Does AP1117K25L-13 require an input capacitor?

An input capacitor is not strictly required for stability but strongly recommended: a 1 µF ceramic capacitor near the VIN pin reduces high-frequency noise and prevents input sag during load transients. Larger bulk capacitance (e.g., 10–47 µF) improves hold-up time and ripple suppression.

AP1117K25L-13 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 18V

Voltage - Output (Min/Fixed):: 2.5V

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:: Surface Mount

Supplier Device Package:: TO-263

AP1117K25L-13 FAQ

1.How can I place an order for AP1117K25L-13 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP1117K25L-13 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 AP1117K25L-13 reliable?

The price and inventory of AP1117K25L-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1117K25L-13 is usually 5 days.

3.What payment methods are accepted for AP1117K25L-13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1117K25L-13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP1117K25L-13?

AP1117K25L-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP1117K25L-13 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 AP1117K25L-13?

For technical support, including AP1117K25L-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1117K25L-13 requirements.

6.How does Aetrix verify that AP1117K25L-13 is sourced from the original manufacturer or authorized distributors?

All AP1117K25L-13 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 AP1117K25L-13 meets industry standards.

7.What is the process for return or replacement of AP1117K25L-13?

All AP1117K25L-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1117K25L-13, 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 AP1117K25L-13 part is unused and in its original packaging.

Return procedure for AP1117K25L-13:

1.Submit a request within 90 days.

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

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