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

STMicroelectronics LD1117AV25

Name: LD1117AV25
Brand: STMicroelectronics
SKU: LD1117AV25
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD1117AV25

Manufacturer:: STMicroelectronics

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

Package:: TO-220-3

Datasheet:: LD1117AV25.pdf

Description:: IC REG LINEAR 2.5V 1A TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:795

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Product details

Overview

LD1117AV25 from STMicroelectronics is a low-dropout linear voltage regulator delivering fixed 2.5 V output at up to 1 A, featuring 1.15 V typical dropout at full load, ±2% output voltage tolerance at 25 °C, and high 80 dB supply voltage rejection at 120 Hz. It operates across 0–125 °C junction temperature and supports stable regulation with only a 10 µF output capacitor - commonly deployed in FPGA core power, microcontroller I/O rails, and industrial sensor signal conditioning.

For engineers reviewing the LD1117AV25 datasheet, LD1117AV25 pinout, LD1117AV25 application, or LD1117AV25 equivalent, key selection criteria include dropout voltage under 1 A load, thermal resistance in SOT-223 (110 °C/W), quiescent current ≤10 mA, and compatibility with standard 10 µF ceramic or electrolytic output capacitors.

Technical Context

The LD1117AV25 uses an NPN pass transistor architecture to achieve low dropout while maintaining internal current and thermal limiting. Its reference voltage is trimmed to ensure ±2% accuracy at 25 °C and 0.5% temperature stability over 0–125 °C.

It requires no external components beyond input/output capacitors for stability, with minimum 10 µF output capacitance specified. The device achieves 60–80 dB supply ripple rejection across 120 Hz–10 kHz, and thermal regulation drift of just 0.08–0.2 %/W under pulsed load conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.5 V ±2% at 25 °C - ensures precise core logic rail compliance for 2.5 V ASICs and FPGAs.
Dropout Voltage	1.15 V typ. @ 1 A, 25 °C - enables operation from 3.65 V input, supporting single-cell Li-ion + LDO architectures.
Output Current	1000 mA min. - sufficient for powering ARM Cortex-M4 microcontrollers with peripherals active.
Quiescent Current	5 mA typ., ≤10 mA max. - minimizes standby power loss in always-on industrial monitoring nodes.
Supply Rejection	80 dB typ. @ 120 Hz - suppresses switching noise from upstream DC/DC converters feeding sensitive analog circuitry.
Thermal Resistance	R_thJA = 110 °C/W (SOT-223) - defines maximum power dissipation (1.1 W) before thermal shutdown at 25 °C ambient.
Operating Temp	0 °C to +125 °C junction - validated for use in enclosed industrial PLC modules without forced airflow.

Pinout & Package

LD1117AV25 is supplied in SOT-223 package, with exposed thermal pad electrically connected to VOUT for enhanced heat dissipation. Pin 1 = INPUT, Pin 2 = OUTPUT, Pin 3 = GROUND (ADJ/GND). The TAB is internally bonded to VOUT and must be soldered to a thermal copper pour.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (INPUT)	Unregulated DC input	Accepts 3.65–15 V DC; must be decoupled with ≥10 µF capacitor close to pin.
Pin 2 (OUTPUT)	Regulated 2.5 V output	Drives load up to 1 A; connects to thermal pad for PCB heat sinking.
Pin 3 (GND / ADJ)	Ground reference / adjust node	Common return path; in fixed versions, internally tied to reference divider - no external connection required.

Key Features

Feature	Design Value
Low dropout	1.15 V @ 1 A enables efficient 2.5 V rail generation from 3.3 V or 3.65 V sources.
Stability with 10 µF	Guaranteed phase margin with common aluminum or ceramic capacitors - eliminates need for specialized low-ESR types.
Internal protection	Integrated current limit and thermal shutdown prevent damage during short-circuit or overload events.
Tight output tolerance	±2% at 25 °C and 0.5% tempco ensures reliable operation across industrial temperature range without calibration.
High PSRR	80 dB suppression of 120 Hz ripple allows clean 2.5 V supply even when fed from noisy SMPS outputs.

Applications

Industrial Sensor Node Power

FPGA I/O Bank Regulation

Use Scenario: Powering 2.5 V analog front-end and digital interface in wireless vibration sensors deployed in factory machinery.

IC Role / Device Role / Timing Role: Primary 2.5 V LDO supplying ADC reference, op-amp bias, and SPI interface logic.

Use Value: 1.15 V dropout permits direct regulation from 3.6 V Li-ion battery, extending runtime by avoiding intermediate buck conversion losses.

Use Scenario: Providing dedicated 2.5 V supply to Xilinx Spartan-7 FPGA I/O banks interfacing with legacy parallel buses.

IC Role / Device Role / Timing Role: Low-noise local regulator isolating I/O power from noisy system 3.3 V rail.

Use Value: 80 dB PSRR suppresses switching noise from adjacent DC/DC converters, preventing timing jitter on high-speed parallel data capture.

Programmable Logic Controller (PLC) Module

Medical Diagnostic Instrument Interface

Use Scenario: Generating stable 2.5 V for isolated CAN transceiver bias and microcontroller I/O in DIN-rail mounted PLC CPU modules.

IC Role / Device Role / Timing Role: Secondary LDO post-regulating switched 5 V supply to meet strict 2.5 V tolerance requirements.

Use Value: ±2% output accuracy and 0.5% tempco ensure consistent logic thresholds across -25 °C to +70 °C operating range.

Use Scenario: Supplying 2.5 V reference and analog signal chain bias in portable ultrasound probe interface electronics.

IC Role / Device Role / Timing Role: Low-noise, thermally robust regulator for precision ADC driver stages.

Use Value: 100 µV RMS output noise (10 Hz–10 kHz) preserves SNR in 12-bit medical-grade signal acquisition paths.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout fixed-voltage regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LD1117S25TR	Same silicon die but SOT-223-only, no TO-220/DPAK variants; identical electrical specs.	No DPAK or TO-220 packaging options - limited to surface-mount-only designs.	Select when board space is constrained and thermal pad layout matches SOT-223 footprint.
TLV1117-25CDCYR	2.5 V fixed version with 1.2 V dropout @ 1 A, 85 dB PSRR, but only ±3% tolerance and 0–125 °C rating.	Higher PSRR but looser initial accuracy; not qualified for extended temperature industrial use per datasheet limits.	Prefer where ultra-low noise is critical and ±3% output tolerance is acceptable in final system calibration.

Compared with LD1117AV25, LD1117S25TR offers identical performance in a smaller footprint but lacks through-hole options, while TLV1117-25CDCYR trades tighter dropout and higher PSRR for reduced output accuracy and narrower thermal qualification - making LD1117AV25 optimal for cost-sensitive industrial designs requiring guaranteed ±2% tolerance and multi-package flexibility.

Availability

LD1117AV25 is available at Aetrix Electronics and suitable for industrial automation controllers, embedded test equipment, and medical diagnostic interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LD1117AV25 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

LD1117AV25 belongs to ST's LD1117A low-dropout regulator product line, engineered specifically for cost-sensitive industrial and embedded applications demanding high reliability, wide temperature operation, and minimal external component count.

FAQ

What is the minimum input voltage required for LD1117AV25 to maintain 2.5 V output at 1 A load?

The minimum input voltage is calculated as V_OUT + V_DROP = 2.5 V + 1.15 V = 3.65 V. At 1 A and 25 °C, the typical dropout is 1.15 V; worst-case dropout is 1.30 V per datasheet Table 6, so 3.80 V ensures regulation across temperature and process variation. Input must remain below 15 V absolute maximum.

Can LD1117AV25 be used with ceramic output capacitors?

Yes - the LD1117AV25 is stable with 10 µF ceramic capacitors having ESR ≥ 0.1 Ω. ST's datasheet explicitly validates stability with standard X5R/X7R MLCCs; no series resistor is needed. Avoid ultra-low-ESR types (< 0.05 Ω) unless verified per application note AN2891.

Does LD1117AV25 require an input capacitor?

Yes - a minimum 10 µF input capacitor is recommended to limit peak input current and suppress upstream noise. While not strictly mandatory for stability, omission risks voltage droop during load transients and reduces PSRR effectiveness. Aluminum or tantalum types are preferred for bulk energy storage near the regulator.

How does thermal performance differ between SOT-223 and DPAK packages for LD1117AV25?

In SOT-223, R_thJA = 110 °C/W limits continuous 1 A operation to ~1.1 W dissipation (ΔT = 121 °C), requiring careful PCB copper area. In DPAK, R_thJA = 100 °C/W and R_thJC = 8 °C/W enable higher power handling via heatsink attachment to the tab - allowing sustained 1 A output at higher ambient temperatures with proper layout.

LD1117AV25 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 15V

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

Voltage - Output (Max):: -

Voltage Dropout (Max):: 1.3V @ 1A

Current - Output:: 1A

Current - Quiescent (Iq):: 10 mA

Current - Supply (Max):: -

PSRR:: 80dB (120Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature

Operating Temperature:: 0°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

LD1117AV25 FAQ

1.How can I place an order for LD1117AV25 through Aetrix?

Please submit a Request for Quotation (RFQ) for LD1117AV25 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 LD1117AV25 reliable?

The price and inventory of LD1117AV25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1117AV25 is usually 5 days.

3.What payment methods are accepted for LD1117AV25?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1117AV25 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD1117AV25?

LD1117AV25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD1117AV25 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 LD1117AV25?

For technical support, including LD1117AV25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1117AV25 requirements.

6.How does Aetrix verify that LD1117AV25 is sourced from the original manufacturer or authorized distributors?

All LD1117AV25 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 LD1117AV25 meets industry standards.

7.What is the process for return or replacement of LD1117AV25?

All LD1117AV25 units undergo pre-shipment inspection (PSI). If there is an issue with LD1117AV25, 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 LD1117AV25 part is unused and in its original packaging.

Return procedure for LD1117AV25:

1.Submit a request within 90 days.

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

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