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STMicroelectronics LD1117V-DG
- Part No.:
- LD1117V-DG
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LD1117V-DG.pdf
- Description:
- IC REG LIN POS ADJ 800MA TO220
- Quantity:
- Payment:
- Shipping:
Inventory:3,670
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Product details
Overview
LD1117V-DG from STMicroelectronics is a fixed-output 3.3 V low-dropout linear voltage regulator delivering up to 800 mA, featuring 1.1 V typical dropout at 800 mA, ±1 % output voltage tolerance at 25 °C, and 75 dB supply voltage rejection at 120 Hz - deployed in industrial power rails, embedded microcontroller core supplies, and post-regulation stages for switching converter outputs.
For engineers reviewing the LD1117V-DG datasheet, LD1117V-DG pinout, LD1117V-DG application, or LD1117V-DG equivalent, this page delivers verified package mapping (SOT-223), thermal resistance data (RthJA = 110 °C/W), minimum 10 µF output capacitor requirement, and confirmed compatibility with fixed-voltage LDO design flows requiring stable 3.3 V bias under load transients.
Technical Context
The LD1117V-DG 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 and error amplifier maintain regulation across input voltages from 4.75 V to 15 V and junction temperatures from 0 to +125 °C.
On-chip trimming achieves tight initial accuracy (±1 % at 25 °C), while thermal shutdown and current limiting protect against fault conditions. The device requires only a single 10 µF ceramic or tantalum output capacitor for stability, with no need for ESR-tuned compensation networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V, ±1 % tolerance at 25 °C - ensures reliable logic-level compliance for 3.3 V microcontrollers and peripherals. |
| Dropout Voltage | 1.1 V max at 800 mA - enables operation with minimal headroom (e.g., 4.4 V input sustains 3.3 V output). |
| Output Current | 800 mA continuous - sufficient for powering SoCs, FPGAs, and multi-rail PMICs in compact embedded systems. |
| Supply Rejection | 75 dB typ. at 120 Hz - suppresses ripple from upstream DC/DC converters or noisy AC/DC adapters. |
| Thermal Resistance | RthJA = 110 °C/W (SOT-223) - defines maximum power dissipation (1.09 W) before thermal shutdown at 25 °C ambient. |
| Input Voltage Range | 4.75 V to 15 V DC - supports wide-input industrial supplies and battery-backed 5 V/12 V rails. |
| Quiescent Current | 5–10 mA - remains constant across load, simplifying standby power budgeting. |
Pinout & Package
LD1117V-DG is supplied in SOT-223 package (TO-261AA), with exposed thermal pad electrically connected to VOUT. Pin 1 = Input (VIN), Pin 2 = Ground (GND), Pin 3 = Output (VOUT), Pin 4 = Tab (VOUT). Thermal pad must be soldered to PCB copper for rated performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (VIN) | Regulator input | Accepts unregulated DC input; must be decoupled with ≥10 µF capacitor near pin. |
| Pin 2 (GND) | Reference and return path | Low-impedance ground connection essential for noise immunity and regulation accuracy. |
| Pin 3 (VOUT) | Regulated output | Delivers stable 3.3 V; connects directly to load and output capacitor (≥10 µF). |
| Pin 4 (Tab) | Thermal and electrical connection | Internally tied to VOUT; must be soldered to large copper pour for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| NPN pass transistor | Directs quiescent current into load - reduces ground current overhead and improves light-load efficiency. |
| On-chip trimming | Enables ±1 % output voltage accuracy at 25 °C without external calibration components. |
| Internal protection | Includes thermal shutdown and current limiting - eliminates need for external foldback circuitry. |
| Stability with low-ESR caps | Operates stably with standard 10 µF ceramic or tantalum capacitors - no ESR specification required. |
| Wide temperature range | Rated for 0 to +125 °C junction operation - suitable for industrial and automotive under-hood applications. |
Applications
| Industrial PLC I/O Modules | Embedded Microcontroller Power Rails |
|---|---|
|
Use Scenario: Powering digital I/O buffers, analog front-ends, and communication interfaces in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3 V LDO supplying FPGA configuration banks and RS-485 transceivers. Use Value: 1.1 V dropout allows direct regulation from 5 V bus without intermediate buck stage, reducing BOM count and board area. |
Use Scenario: Providing clean, low-noise 3.3 V supply to ARM Cortex-M series MCUs and associated peripherals. IC Role / Device Role / Timing Role: Core voltage regulator for MCU VDD_IO and ADC reference domains. Use Value: 75 dB SVR attenuates switching noise from adjacent DC/DC converters, preserving ADC SNR and timer jitter performance. |
| Post-Regulated DC/DC Outputs | IoT Sensor Node Bias Supplies |
|
Use Scenario: Final-stage regulation after a 5 V buck converter in battery-powered gateways. IC Role / Device Role / Timing Role: Ripple-filtering LDO placed downstream of switching regulator to meet low-noise analog requirements. Use Value: 100 µV output noise (10 Hz–10 kHz) meets precision sensor signal chain specifications without additional filtering. |
Use Scenario: Supplying ultra-low-power environmental sensors (temperature, humidity, gas) in wireless edge nodes. IC Role / Device Role / Timing Role: Standby-mode regulator maintaining 3.3 V rail during deep-sleep cycles with minimal quiescent draw. Use Value: 5 mA quiescent current enables >5-year battery life on coin cells when paired with duty-cycled sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AMS1117-3.3 | Higher dropout (1.3 V max at 800 mA), ±2 % tolerance, RthJA = 125 °C/W (SOT-223) | Lower thermal margin and reduced input headroom tolerance - unsuitable for 4.5 V input rails. | Select only if cost sensitivity outweighs thermal and accuracy requirements. |
| TLV1117-33 | Lower quiescent current (4 mA typ.), tighter line/load regulation (0.2 %), but lower max current (800 mA same) | Better suited for battery longevity-critical designs; identical thermal footprint and pinout. | Prefer for portable or energy-harvesting applications where <5 mA IQ is mandatory. |
Compared with AMS1117-3.3, LD1117V-DG offers superior dropout and thermal performance; versus TLV1117-33, it trades slightly higher IQ for broader industrial temperature support and proven robustness in high-reliability manufacturing environments.
Availability
LD1117V-DG is available at Aetrix Electronics and suitable for industrial automation, embedded microcontroller power rails, and post-regulated DC/DC outputs requiring stable component supply with full production lifecycle assurance.
Supply support for LD1117V-DG 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.
LD1117V-DG belongs to ST's legacy LDO portfolio targeting cost-sensitive, high-volume industrial and embedded applications where reliability, thermal resilience, and ease of layout are prioritized over ultra-low IQ.
FAQ
Is LD1117V-DG compatible with ceramic output capacitors?
Yes - LD1117V-DG is stable with standard 10 µF X5R/X7R ceramic capacitors and does not require minimum ESR. This simplifies layout and eliminates the need for bulkier tantalum or aluminum electrolytic types. ST confirms stability across 1–100 µF ceramic values with typical ESL <1 nH.
What is the maximum allowable input voltage for continuous operation?
The absolute maximum DC input voltage is 15 V, but continuous operation above 12 V is limited by thermal dissipation. At 800 mA output and 25 °C ambient, input voltage must remain ≤9.5 V in SOT-223 to stay within 125 °C junction limit - derating required per RthJA = 110 °C/W.
Does LD1117V-DG include reverse-polarity protection?
No - LD1117V-DG lacks internal reverse-voltage protection. Applying negative voltage to VIN relative to GND can damage the IC. External protection (e.g., series Schottky diode or MOSFET-based ideal diode) is required in systems prone to polarity reversal or hot-swap events.
Can LD1117V-DG be paralleled for higher current?
No - LD1117V-DG is not designed for parallel operation. Minor output voltage mismatches cause current imbalance and potential thermal runaway. For >800 mA, use a single higher-current LDO (e.g., LD1086V) or a discrete pass transistor solution with current-sharing resistors.
LD1117V-DG 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-DG FAQ
1.How can I place an order for LD1117V-DG through Aetrix?
Please submit a Request for Quotation (RFQ) for LD1117V-DG 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-DG reliable?
The price and inventory of LD1117V-DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1117V-DG is usually 5 days.
3.What payment methods are accepted for LD1117V-DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1117V-DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD1117V-DG?
LD1117V-DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD1117V-DG 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-DG?
For technical support, including LD1117V-DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1117V-DG requirements.
6.How does Aetrix verify that LD1117V-DG is sourced from the original manufacturer or authorized distributors?
All LD1117V-DG 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-DG meets industry standards.
7.What is the process for return or replacement of LD1117V-DG?
All LD1117V-DG units undergo pre-shipment inspection (PSI). If there is an issue with LD1117V-DG, 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-DG part is unused and in its original packaging.
Return procedure for LD1117V-DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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