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

STMicroelectronics LD1117D50

Name: LD1117D50
Brand: STMicroelectronics
SKU: LD1117D50
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD1117D50

Manufacturer:: STMicroelectronics

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

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: LD1117D50.pdf

Description:: IC REG LINEAR 5V 800MA 8SO

Quantity:: RFQ Add To RFQ list

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Inventory:2,631

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Product details

Overview

LD1117D50 from STMicroelectronics is a fixed-output 5.0 V low-dropout linear 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 industrial power rails, embedded microcontroller supply, and post-regulation of switching converter outputs.

For engineers reviewing the LD1117D50 datasheet, LD1117D50 pinout, LD1117D50 application, or LD1117D50 equivalent, this page delivers verified electrical specs, thermal performance data, package-specific layout guidance, and real-world use cases for stable 5 V local regulation in space-constrained and thermally demanding designs.

Technical Context

The LD1117D50 employs an NPN pass transistor architecture that directs quiescent current primarily into the load-reducing no-load power loss versus PNP-based regulators. Its internal bandgap reference and trimming circuitry enable ±1 % initial accuracy at 25 °C and 0.5 % temperature stability across –40 to +125 °C.

Stability requires only a 10 µF ceramic or tantalum output capacitor; no input capacitor is mandatory. Built-in thermal shutdown and current limiting protect against overload and fault conditions without external components.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 5.0 V (±1 % at 25 °C; ±2 % over full –40 to +125 °C range)
Max Output Current	800 mA continuous (1300 mA peak at TJ = 25 °C with adequate heatsinking)
Dropout Voltage	1.0 V typ. at 100 mA; 1.15 V max at 500 mA; enables operation with VIN as low as 6.15 V for 5 V out
Supply Voltage Rejection	75 dB typ. at 120 Hz (1 VPP ripple rejection), critical for cleaning noisy DC-DC outputs
Quiescent Current	5–10 mA (independent of load), enabling predictable standby power in always-on systems
Thermal Resistance	R_thJA = 50 °C/W (TO-220), 100 °C/W (DPAK), 110 °C/W (SOT-223)-directly determines max ambient temperature vs. load
Output Noise	100 µV RMS (10 Hz–10 kHz), suitable for analog sensor and ADC reference supplies

Pinout & Package

LD1117D50 is available in TO-220, DPAK (TO-252), SOT-223, and SO-8 packages. The tab (exposed pad or metal slug) is electrically connected to V_OUT, serving as both thermal path and output terminal.

Pin/Terminal	Circuit Role	Design Meaning
IN	Input voltage supply	Accepts 6.5–15 V DC; must be ≥ (V_OUT + V_DROP) under worst-case load/temperature
OUT	Regulated output	5.0 V source; connects directly to load and output capacitor; bonded to exposed tab
GND	Ground reference	Return path for load current and internal bias; requires low-impedance PCB connection to minimize noise

Key Features

Feature	Design Value
Low dropout	1.0 V typ. at 100 mA enables high-efficiency 5 V regulation from 6–7 V sources (e.g., LiFePO₄ battery or buck converter)
High accuracy	±1 % output tolerance at 25 °C ensures reliable logic-level compliance for 5 V TTL/CMOS and microcontrollers
Minimal external parts	Only one 10 µF output capacitor required-no input cap or compensation network needed
Robust protection	Integrated thermal shutdown and current limit prevent damage during short-circuit or overtemperature events
Wide temp range	Specified for –40 to +125 °C junction operation (C-grade), supporting automotive under-hood and industrial control environments

Applications

Industrial PLC I/O Module Power

Embedded Microcontroller Core Supply

Use Scenario: Local 5 V rail generation for digital I/O drivers and isolated communication interfaces in programmable logic controllers.

IC Role / Device Role / Timing Role: Primary LDO regulator providing clean, stable 5 V to optocoupler inputs, level shifters, and RS-485 transceivers.

Use Value: 75 dB SVR suppresses ripple from upstream 24 V DC-DC converters; 800 mA capacity supports multiple parallel I/O channels.

Use Scenario: Dedicated 5 V supply for ARM Cortex-M or RISC-V MCU cores and peripheral subsystems on compact edge-node PCBs.

IC Role / Device Role / Timing Role: Post-regulator following a high-efficiency buck converter, ensuring low-noise voltage for clock domains and ADC references.

Use Value: 100 µV RMS noise meets <1 LSB error requirement for 12-bit ADCs; SOT-223 footprint saves board area without sacrificing thermal margin.

Automotive Body Control Unit (BCU)

Consumer Audio DAC Reference Supply

Use Scenario: Regulating 5 V for microcontroller, CAN transceiver, and LED driver ICs in body electronics modules operating across –40 to +105 °C ambient.

IC Role / Device Role / Timing Role: Fixed-output LDO with extended temperature grade (LD1117D50C) delivering robust local power under cold-crank and load-dump conditions.

Use Value: ±2 % tolerance over full temperature range guarantees logic compatibility; built-in thermal protection prevents latch-up during transient overloads.

Use Scenario: Ultra-low-noise 5 V reference for stereo audio DACs in portable Bluetooth speakers and smart home hubs.

IC Role / Device Role / Timing Role: Low-noise linear regulator supplying DAC analog core and internal reference buffer, decoupled from noisy digital supply rails.

Use Value: 100 µV RMS output noise avoids audible hiss; 0.5 % temperature stability prevents gain drift across operating conditions.

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
LM2940CT-5.0	Higher dropout (0.5 V min at 100 mA), lower PSRR (55 dB), wider tolerance (±5 %), TO-220 only	Limited to less demanding industrial applications where input headroom >7 V is available	Choose when cost sensitivity outweighs noise/accuracy requirements and thermal design allows higher R_thJA
MCP1700T-5002E/MB	Lower current (250 mA), much lower quiescent current (1.6 µA), SOT-23 only, ±2 % tolerance	Suitable for ultra-low-power sensor nodes-not for 800 mA loads or high-SVRR needs	Select only for battery-powered devices requiring nanowatt standby; not a functional replacement for LD1117D50's current or noise specs

Compared with LM2940CT-5.0 and MCP1700T-5002E/MB, LD1117D50 uniquely balances high output current, tight voltage accuracy, low noise, and strong ripple rejection-making it the preferred choice for mid-power industrial and embedded 5 V regulation where performance and reliability are prioritized over minimal quiescent current or lowest cost.

Availability

LD1117D50 is available at Aetrix Electronics and suitable for industrial automation power rails, embedded microcontroller supply, and post-regulation of switching converter outputs requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for LD1117D50 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

LD1117D50 belongs to ST's legacy linear regulator product line, engineered specifically for cost-sensitive, high-reliability 5 V local regulation in industrial control, building automation, and legacy-compatibility applications.

FAQ

What is the minimum input voltage required for LD1117D50 to maintain regulation at 800 mA?

The minimum input voltage is determined by the dropout specification: at 800 mA and 125 °C, V_DROP reaches 1.3 V (max). Therefore, VIN must be ≥ 6.3 V to sustain 5.0 V output. At room temperature, 6.15 V suffices per the 1.15 V max dropout at 500 mA and 1.2 V at 800 mA.

Can LD1117D50 be used without an input capacitor?

Yes-unlike many LDOs, LD1117D50 does not require an input capacitor for stability. The datasheet specifies stability with only a 10 µF output capacitor (ceramic or tantalum). An input capacitor may be added for bulk filtering but is not necessary for loop stability or startup behavior.

Which package offers the best thermal performance for continuous 800 mA operation?

The TO-220 package provides the lowest thermal resistance: R_thJA = 50 °C/W (with 1 in² copper pour) and R_thJC = 5 °C/W. This allows ~12 W power dissipation before reaching 125 °C junction temperature-enabling safe 800 mA operation even at 15 V input (5 V drop × 0.8 A = 4 W dissipation).

Is LD1117D50 compatible with ceramic output capacitors?

Yes-LD1117D50 is stable with ceramic output capacitors ≥10 µF and ESR as low as 0.1 Ω. Unlike older LDOs, it does not require a minimum ESR, making it compatible with modern low-ESR MLCCs and simplifying layout while improving transient response.

LD1117D50 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 15V

Voltage - Output (Min/Fixed):: 5V

Voltage - Output (Max):: -

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

Current - Output:: 800mA

Current - Quiescent (Iq):: 10 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:: Surface Mount

Supplier Device Package:: 8-SOIC

LD1117D50 FAQ

1.How can I place an order for LD1117D50 through Aetrix?

Please submit a Request for Quotation (RFQ) for LD1117D50 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 LD1117D50 reliable?

The price and inventory of LD1117D50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1117D50 is usually 5 days.

3.What payment methods are accepted for LD1117D50?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1117D50 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD1117D50?

LD1117D50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD1117D50 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 LD1117D50?

For technical support, including LD1117D50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1117D50 requirements.

6.How does Aetrix verify that LD1117D50 is sourced from the original manufacturer or authorized distributors?

All LD1117D50 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 LD1117D50 meets industry standards.

7.What is the process for return or replacement of LD1117D50?

All LD1117D50 units undergo pre-shipment inspection (PSI). If there is an issue with LD1117D50, 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 LD1117D50 part is unused and in its original packaging.

Return procedure for LD1117D50:

1.Submit a request within 90 days.

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

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