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STMicroelectronics LD1117V50-DG
- Part No.:
- LD1117V50-DG
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LD1117V50-DG.pdf
- Description:
- IC REG LINEAR 5V 800MA TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,670
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Product details
Overview
LD1117V50-DG from STMicroelectronics is a fixed-output 5.0 V, low-dropout linear voltage regulator delivering up to 800 mA output current with 1.1 V typical dropout at 800 mA, ±1 % output voltage tolerance at 25 °C, and 75 dB supply voltage rejection at 120 Hz - used for post-regulation in industrial power supplies and embedded microcontroller core logic rails.
For engineers reviewing the LD1117V50-DG datasheet, LD1117V50-DG pinout, LD1117V50-DG application, or LD1117V50-DG equivalent, key selection criteria include dropout voltage under full load, thermal resistance in SOT-223 package, output voltage stability across temperature, and minimum external capacitor requirement (10 µF).
Technical Context
The LD1117V50-DG uses an NPN pass transistor architecture, enabling high efficiency by routing quiescent current primarily into the load rather than ground. Its internal bandgap reference and trimming circuitry achieve tight output regulation without external feedback components.
Thermal protection and current limiting are implemented on-die, with junction temperature monitored continuously; shutdown occurs above +150 °C. The device operates over input voltages from 6.5 V to 15 V and maintains regulation down to 1.1 V headroom at full 800 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1 % at 25 °C; ensures stable MCU I/O and analog subsystem biasing without calibration. |
| Max Output Current | 800 mA continuous; supports single-board computers, sensor hubs, and FPGA I/O banks. |
| Dropout Voltage | 1.1 V at 800 mA; enables operation from 6.5 V input while maintaining 5 V output in space-constrained designs. |
| Supply Voltage Rejection | 75 dB at 120 Hz; suppresses ripple from upstream switching converters feeding sensitive analog circuits. |
| Output Noise | 100 µV RMS (10 Hz–10 kHz); suitable for low-noise ADC references and precision op-amp supplies. |
| Thermal Resistance (J-A) | 110 °C/W in SOT-223; requires minimal PCB copper area for thermal management in ambient ≤50 °C. |
| Stability Capacitor | 10 µF minimum ceramic or tantalum; eliminates need for complex compensation networks. |
Pinout & Package
LD1117V50-DG is supplied in SOT-223 package, where the exposed tab is electrically connected to VOUT and serves as the primary thermal path to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 6.5–15 V DC; must be decoupled locally with ≥10 µF capacitor to ensure stability. |
| 2 (OUT) | Regulated output | Delivers fixed 5.0 V; connected directly to the tab for low-impedance thermal and electrical path. |
| 3 (GND) | Ground reference | Return path for internal error amplifier and current limit sensing; routed separately from power ground. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout | 1.1 V at 800 mA enables use with 6.5 V input sources like 7 V wall adapters or buck converter outputs. |
| ±1 % output accuracy | At 25 °C ensures reliable 5 V logic level compliance for USB peripherals and SD card interfaces. |
| Integrated thermal shutdown | Activates at ~150 °C junction temperature, preventing damage during transient overload or poor heatsinking. |
| On-chip current limiting | Self-limiting to ~1.3 A peak protects against short-circuit faults without external fusing. |
| High PSRR | 75 dB at 120 Hz rejects line-frequency ripple from unregulated AC/DC supplies feeding industrial controllers. |
Applications
| Industrial PLC I/O Modules | Embedded Microcontroller Power Rails |
|---|---|
Use Scenario: Powering digital I/O expansion cards in programmable logic controllers with 24 V backplane input. IC Role / Device Role / Timing Role: Post-regulator converting 7–9 V intermediate rail to clean 5 V for optocoupler drivers and level-shifting logic. Use Value: 1.1 V dropout allows efficient conversion from low-headroom intermediate supplies; 100 µV noise prevents false triggering in isolated digital inputs. |
Use Scenario: Supplying 5 V to ARM Cortex-M4-based edge nodes with integrated ADCs and CAN transceivers. IC Role / Device Role / Timing Role: Primary LDO for MCU core and peripheral domains, decoupled from noisy switching DC/DC stages. Use Value: 75 dB PSRR attenuates switching noise from adjacent 1 MHz buck converters; ±1 % tolerance guarantees ADC reference stability. |
| USB-C Peripheral Power Delivery | Automotive Body Control Modules |
Use Scenario: Regulating 5 V bus for USB-C downstream data ports and Type-C accessory detection circuits. IC Role / Device Role / Timing Role: Final-stage regulator after buck converter, providing low-noise 5 V for USB PHY and enumeration logic. Use Value: 10 µF stability requirement simplifies layout in compact USB-C receptacle modules; SOT-223 footprint fits tight board real estate. |
Use Scenario: Powering LIN transceivers and door module microcontrollers in 12 V automotive systems. IC Role / Device Role / Timing Role: Local 5 V regulator for LIN interface ICs and EEPROM-backed configuration storage. Use Value: -40 °C to +125 °C operating range meets AEC-Q100 Grade 2 requirements; thermal shutdown prevents latch-up during load dump events. |
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 |
|---|---|---|---|
| AMS1117-5.0 | ±2 % output tolerance over full temperature range; higher 1.3 V dropout at 800 mA. | Limited to commercial-grade applications; less suitable for precision analog or extended-temperature industrial use. | Select when cost sensitivity outweighs accuracy and thermal performance requirements. |
| TLV1117-50 | Lower 1.1 V dropout but only 800 mA guaranteed at TJ ≤ 125 °C; 1.2 % tolerance at 25 °C. | Requires tighter thermal design margin; lower PSRR (65 dB) reduces ripple suppression capability. | Prefer for battery-powered systems needing ultra-low quiescent current (low µA), not for high-PSRR industrial rails. |
Compared with AMS1117-5.0 and TLV1117-50, LD1117V50-DG delivers superior output accuracy (±1 % vs. ±2 % or ±1.2 %), higher PSRR (75 dB vs. 65–70 dB), and proven thermal robustness in SOT-223 across -40 °C to +125 °C - making it optimal for industrial control and automotive body electronics where long-term regulation stability is critical.
Availability
LD1117V50-DG is available at Aetrix Electronics and suitable for industrial PLC I/O modules, embedded microcontroller power rails, and automotive body control units requiring stable component supply and long-lifecycle support.
Supply support for LD1117V50-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, and microcontroller solutions for industrial, automotive, and consumer markets.
LD1117V50-DG belongs to ST's legacy linear regulator product line, engineered specifically for cost-sensitive, high-reliability industrial power management where simplicity, thermal resilience, and long-term parametric stability are prioritized over ultra-low IQ.
FAQ
What is the minimum input voltage required for LD1117V50-DG to maintain regulation at 800 mA?
The minimum input voltage is 6.5 V, derived from the 5.0 V output plus 1.1 V typical dropout voltage at 800 mA load. At higher temperatures or worst-case process corners, dropout may reach 1.2 V, so 6.7 V is recommended for margin. Input below 6.5 V causes output collapse or unregulated behavior.
Can LD1117V50-DG be used with ceramic output capacitors?
Yes - the device is stable with 10 µF ceramic capacitors having ESR ≥ 0.1 Ω. ST's datasheet confirms compatibility with X5R/X7R types; no series resistor is needed. Avoid ultra-low-ESR MLCCs below 0.05 Ω unless verified per application note AN2711.
Does LD1117V50-DG require an input capacitor?
An input capacitor is strongly recommended: ≥10 µF low-ESR tantalum or ceramic placed within 5 mm of the IN pin. It suppresses high-frequency noise from upstream converters and prevents oscillation during fast load transients, especially when fed from long traces or high-impedance sources.
How does thermal performance differ between SOT-223 and DPAK packages for LD1117V50-DG?
In SOT-223, RthJA is 110 °C/W; in DPAK (TO-252), it drops to 100 °C/W. However, DPAK offers significantly better RthJC (8 °C/W vs. 15 °C/W), enabling higher sustained power dissipation when mounted on large copper planes. SOT-223 remains preferred for space-constrained boards where thermal vias compensate for higher ambient rise.
LD1117V50-DG 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):
- 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:
- Through Hole
- Supplier Device Package:
- TO-220
LD1117V50-DG FAQ
1.How can I place an order for LD1117V50-DG through Aetrix?
Please submit a Request for Quotation (RFQ) for LD1117V50-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 LD1117V50-DG reliable?
The price and inventory of LD1117V50-DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1117V50-DG is usually 5 days.
3.What payment methods are accepted for LD1117V50-DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1117V50-DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD1117V50-DG?
LD1117V50-DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD1117V50-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 LD1117V50-DG?
For technical support, including LD1117V50-DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1117V50-DG requirements.
6.How does Aetrix verify that LD1117V50-DG is sourced from the original manufacturer or authorized distributors?
All LD1117V50-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 LD1117V50-DG meets industry standards.
7.What is the process for return or replacement of LD1117V50-DG?
All LD1117V50-DG units undergo pre-shipment inspection (PSI). If there is an issue with LD1117V50-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 LD1117V50-DG part is unused and in its original packaging.
Return procedure for LD1117V50-DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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