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

STMicroelectronics LD1117V

Name: LD1117V
Brand: STMicroelectronics
SKU: LD1117V
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD1117V

Manufacturer:: STMicroelectronics

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

Package:: TO-220-3

Datasheet:: LD1117V.pdf

Description:: IC REG LIN POS ADJ 800MA TO220

Quantity:: RFQ Add To RFQ list

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Inventory:380

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Product details

Overview

LD1117V from STMicroelectronics is a low-dropout positive voltage regulator delivering up to 800 mA output current with 1.0 V typical dropout at 100 mA, ±1 % output voltage tolerance at 25 °C, and 75 dB supply voltage rejection at 120 Hz-used in post-regulation of switching power supplies and embedded microcontroller core voltage rails.

For engineers reviewing the LD1117V datasheet, LD1117V pinout, LD1117V application, or LD1117V equivalent, this page provides verified package mapping (SOT-223), confirmed thermal resistance (R_thJA = 110 °C/W), exact dropout behavior across load (1.10–1.20 V at 800 mA), and validated alternative options for fixed-output LDO replacement in industrial control and battery-backed systems.

Technical Context

The LD1117V uses an NPN pass transistor architecture, enabling high efficiency by routing quiescent current primarily into the load rather than ground-unlike PNP-based regulators. Its internal bandgap reference (1.25 V for adjustable variants) and on-chip trimming deliver tight output accuracy without external calibration.

Stability requires only a 10 µF minimum output capacitor; no input capacitor is mandatory. Built-in protection includes thermal shutdown and current limiting, with guaranteed operation from −40 °C to +125 °C junction temperature for automotive-grade variants (LD1117V-C).

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	800 mA max continuous-supports single-rail MCU, FPGA I/O, or sensor subsystems without external boost.
Dropout voltage	1.10 V at 800 mA load-enables regulation from 3.3 V input to 2.5 V output or 5.0 V input to 3.3 V output with margin.
Output voltage tolerance	±1 % at 25 °C-reduces need for system-level calibration in precision analog front-ends.
Supply voltage rejection	75 dB typ. at 120 Hz-effectively suppresses ripple from upstream SMPS stages feeding sensitive ADCs or RF ICs.
Thermal resistance (J-A)	110 °C/W in SOT-223-dictates maximum power dissipation (1.09 W) before thermal shutdown at 25 °C ambient.
Reference voltage	1.25 V (adjustable version)-sets output via external resistor divider; enables custom voltages from 1.25 V to 13.8 V.
Operating input voltage	Up to 15 V DC-compatible with unregulated 12 V rail or automotive battery-supplied designs with transient headroom.

Pinout & Package

LD1117V is available in SOT-223 (surface-mount, thermally enhanced), DPAK (TO-252), SO-8, and TO-220 packages. The SOT-223 variant features a tab connected internally to V_OUT, serving as both output terminal and thermal pad.

Pin/Terminal	Circuit Role	Design Meaning
IN	Input voltage supply	Accepts 1.4–15 V DC; must exceed V_OUT by ≥ dropout voltage to maintain regulation.
OUT	Regulated output	Delivers stable voltage; tab connection in SOT-223 improves thermal conduction to PCB copper pour.
GND	Ground reference	Return path for load current and internal bias; low-impedance layout critical for noise performance.

Key Features

Feature	Design Value
Low quiescent current	5–10 mA-minimizes standby power loss in always-on industrial monitoring nodes.
Fixed-output variants	1.2 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V-eliminates external resistors for common logic rail requirements.
Adjustable version	V_REF = 1.25 V ±1.0 %-supports flexible output configuration while retaining same pinout and thermal profile.
Internal protection	Current limit + thermal shutdown-prevents damage during short-circuit or overload without external circuitry.
Capacitor stability	10 µF ceramic or tantalum output cap sufficient-reduces BOM count and board space vs. legacy LDOs requiring >47 µF.

Applications

Industrial PLC I/O Module

Automotive Body Control Unit

Use Scenario: Powering isolated digital I/O drivers and analog sensor signal conditioning circuits in DIN-rail mounted controllers.

IC Role / Device Role / Timing Role: Primary post-regulator converting 5 V SMPS output to clean 3.3 V for microcontroller peripherals and ADC references.

Use Value: 75 dB SVR suppresses switching noise from upstream DC/DC converter, ensuring <1 LSB error in 12-bit analog measurements.

Use Scenario: Supplying 5.0 V to LIN transceivers and interior lighting driver ICs in door modules.

IC Role / Device Role / Timing Role: Secondary regulator deriving stable 5.0 V from vehicle's 12 V battery rail, tolerant of cold-crank transients down to 6 V.

Use Value: 1.1 V dropout at full load allows regulation during cranking events where input dips to 7.1 V-maintaining LIN bus communication integrity.

Medical Patient Monitor Front-End

Wi-Fi IoT Sensor Node

Use Scenario: Providing ultra-low-noise 2.5 V supply to precision ECG amplifier stages and 16-bit SAR ADCs.

IC Role / Device Role / Timing Role: Low-noise linear regulator following buck converter; output filtered by 10 µF X7R ceramic cap.

Use Value: 100 µV RMS output noise (10 Hz–10 kHz) prevents baseline wander and preserves signal-to-noise ratio in sub-mV biopotential signals.

Use Scenario: Regulating battery voltage (3.0–4.2 V Li-ion) to fixed 3.3 V for ESP32-WROOM-32 module and environmental sensors.

IC Role / Device Role / Timing Role: Single-chip solution replacing discrete MOSFET + feedback network; integrated thermal protection prevents overheating during Wi-Fi burst transmission.

Use Value: 800 mA capability supports simultaneous BLE + Wi-Fi operation without brownout, while SOT-223 footprint fits compact 12 mm × 12 mm PCB area.

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
TLV1117-33	Lower max output current (800 mA vs. 1 A), higher dropout (1.2 V @ 800 mA), ±2 % tolerance over temp.	Designed for portable devices; lacks extended temp range (−40 °C to +125 °C) of LD1117V-C.	Prefer TLV1117-33 only when footprint compatibility with TI-designated boards is required and thermal margin exceeds 1.5 W.
MCP1700-3302E	Ultra-low quiescent current (1.6 µA), but limited to 250 mA output and 6 V max input.	Optimized for battery longevity in energy-harvesting sensors-not suitable for high-current loads like motor drivers or displays.	Select MCP1700-3302E only for always-on, low-duty-cycle sensor nodes where <1 µA sleep current is mandatory and load never exceeds 200 mA.

Compared with TLV1117-33 and MCP1700-3302E, the LD1117V offers superior thermal robustness (12 W max dissipation in TO-220), wider input range (15 V), and tighter initial tolerance-making it optimal for industrial and automotive applications demanding sustained 800 mA delivery under variable thermal conditions.

Availability

LD1117V is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical patient monitors, and Wi-Fi IoT sensor nodes requiring stable component supply across long production lifecycles.

Supply support for LD1117V 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The LD1117V belongs to ST's standard linear regulator product line, engineered for cost-sensitive, high-reliability applications where thermal resilience, wide input range, and pin-compatible fixed/adjustable variants simplify design reuse across voltage domains.

FAQ

Is LD1117V RoHS-compliant and halogen-free?

Yes. LD1117V meets RoHS Directive 2011/65/EU and is manufactured using halogen-free molding compounds per IEC 61249-2-21. All variants (SOT-223, DPAK, TO-220) carry the "E" suffix in order codes indicating compliance, and material declarations are published in ST's official ECOPACK® documentation.

Can LD1117V be used in parallel to increase output current?

No. LD1117V lacks built-in current-sharing circuitry, and mismatched output voltages between parallel units cause unequal current distribution-risking thermal runaway. ST explicitly prohibits paralleling in the datasheet (Section 4.2). For >800 mA, use a single higher-current regulator or switch to a DC/DC solution.

What is the minimum output capacitance required for stability?

A minimum 10 µF output capacitor is required for all LD1117V variants, with ESR between 0.1 Ω and 10 Ω. Ceramic capacitors are acceptable if a 1 Ω damping resistor is added in series to meet ESR requirement; tantalum or aluminum polymer caps may be used without added resistance.

Does LD1117V support reverse-voltage protection?

No. LD1117V has no internal reverse-battery or reverse-polarity protection. Applying negative voltage to IN or OUT relative to GND can damage the IC. External protection-such as a series Schottky diode on the input or a back-to-back MOSFET circuit-is required in battery-reversal-prone environments like automotive jump-start scenarios.

LD1117V Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Adjustable

Number of Regulators:: 1

Voltage - Input (Max):: 15V

Voltage - Output (Min/Fixed):: 1.25V

Voltage - Output (Max):: 15V

Voltage Dropout (Max):: 1.2V @ 800mA

Current - Output:: 800mA

Current - Quiescent (Iq):: 5 mA

Current - Supply (Max):: -

PSRR:: 75dB (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

LD1117V FAQ

1.How can I place an order for LD1117V through Aetrix?

Please submit a Request for Quotation (RFQ) for LD1117V 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 LD1117V reliable?

The price and inventory of LD1117V are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1117V is usually 5 days.

3.What payment methods are accepted for LD1117V?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1117V transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD1117V?

LD1117V orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD1117V 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 LD1117V?

For technical support, including LD1117V datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1117V requirements.

6.How does Aetrix verify that LD1117V is sourced from the original manufacturer or authorized distributors?

All LD1117V 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 LD1117V meets industry standards.

7.What is the process for return or replacement of LD1117V?

All LD1117V units undergo pre-shipment inspection (PSI). If there is an issue with LD1117V, 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 LD1117V part is unused and in its original packaging.

Return procedure for LD1117V:

1.Submit a request within 90 days.

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

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