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STMicroelectronics LD1086V18-DG
- Part No.:
- LD1086V18-DG
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LD1086V18-DG.pdf
- Description:
- IC REG LINEAR 1.8V 1.5A TO220
- Quantity:
- Payment:
- Shipping:
Inventory:1,002
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Product details
Overview
LD1086V18-DG from STMicroelectronics is a fixed-output 1.8 V, 1.5 A low-dropout linear voltage regulator in DPAK package, designed for post-regulation in power management subsystems where input-to-output differential is constrained. It delivers ±1% output tolerance at 25 °C, 1.3 V typical dropout at full load, and operates across –40 °C to +125 °C ambient. Used in industrial PLC I/O modules requiring stable 1.8 V core supply for microcontrollers and FPGAs.
For engineers reviewing the LD1086V18-DG datasheet, LD1086V18-DG pinout, LD1086V18-DG application, or LD1086V18-DG equivalent, key selection criteria include guaranteed 1.5 A output current, thermal-limited short-circuit protection, DPAK thermal resistance (RthJA = 33 °C/W), and compatibility with minimal 10 µF output capacitance for stability.
Technical Context
The LD1086V18-DG integrates an NPN pass transistor architecture with internal bandgap reference and error amplifier, enabling quiescent current to flow into the load rather than being wasted-improving efficiency over legacy PNP regulators. Its dropout behavior is monotonic and specified down to 1.3 V at 1.5 A, with thermal shutdown triggered at junction temperatures exceeding 150 °C.
It supports both fixed-output (1.8 V) and adjustable configurations via external resistor divider on the ADJ/GND pin; however, the LD1086V18-DG variant is factory-trimmed for fixed 1.8 V operation. The device requires no external compensation beyond a 10 µF ceramic or tantalum output capacitor and exhibits 82 dB supply voltage rejection at 120 Hz with 25 µF output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±1% at 25 °C; ensures precise core rail for 1.8 V logic and memory interfaces without external feedback. |
| Max Output Current | 1.5 A continuous; supports high-current digital loads like FPGA I/O banks or multi-core MCU domains. |
| Dropout Voltage | 1.3 V typical at 1.5 A; enables operation with only 3.1 V input for reliable 1.8 V output in battery-backed or low-headroom systems. |
| Operating Temp Range | –40 °C to +125 °C ambient; qualified for extended industrial and automotive under-hood environments. |
| Quiescent Current | 5–10 mA; flows into load-not ground-reducing total system power loss versus traditional LDOs. |
| Thermal Protection | Internal junction temperature limit at 150 °C with automatic recovery; prevents permanent damage during sustained overload or poor heatsinking. |
| Stability Capacitor | 10 µF minimum ceramic/tantalum output capacitor; eliminates need for complex compensation networks in compact PCB layouts. |
Pinout & Package
LD1086V18-DG uses the DPAK (TO-252) surface-mount package with exposed thermal pad connected to the output terminal. This configuration provides low thermal resistance (RthJA = 33 °C/W) and mechanical robustness for reflow-soldered industrial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input Supply Terminal | Accepts 3.4 V to 30 V DC input; must be decoupled with ≥1 µF ceramic capacitor near the pin. |
| 2 (OUTPUT) | Regulated Output Terminal | Delivers fixed 1.8 V; electrically tied to exposed thermal tab for enhanced heat dissipation. |
| 3 (GND) | Ground Reference | System ground return path; requires low-inductance connection to minimize noise coupling into regulation loop. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-to-pin compatible with legacy adjustable regulators | Enables drop-in replacement of older 3-terminal LDOs (e.g., LM317-based designs) without PCB redesign. |
| Load-referred quiescent current | Improves overall system efficiency by routing bias current through the load instead of sinking it to ground. |
| ±1% output tolerance at 25 °C | Reduces need for post-production calibration in precision analog or high-speed digital power rails. |
| Internally trimmed reference | Eliminates external trimming components and associated layout sensitivity, lowering BOM count and test complexity. |
| Wide input voltage range (3.4–30 V) | Supports direct regulation from unregulated 5 V, 12 V, or 24 V industrial bus rails without pre-regulation stage. |
Applications
| Industrial PLC I/O Modules | FPGA Core Power Supply |
|---|---|
|
Use Scenario: Providing clean, stable 1.8 V to FPGA configuration banks and transceivers in modular automation controllers. IC Role / Device Role / Timing Role: Primary post-regulator delivering tightly regulated core voltage with fast transient response to dynamic FPGA load changes. Use Value: Maintains FPGA functional integrity under rapid current steps up to 1.5 A while meeting ±1% voltage accuracy required for JTAG and high-speed SerDes operation. |
Use Scenario: Powering ARM Cortex-M7 microcontroller cores in edge AI gateways operating in harsh factory environments. IC Role / Device Role / Timing Role: Fixed-output LDO supplying processor core rail with thermal foldback protection during burst-mode compute workloads. Use Value: Ensures deterministic CPU performance across –40 °C to +85 °C ambient without derating, leveraging 125 °C junction rating and 33 °C/W thermal resistance. |
| Automotive Body Control Units | Test & Measurement Instrumentation |
|
Use Scenario: Regulating 1.8 V for CAN FD transceiver logic and sensor interface ICs in non-safety-critical vehicle subsystems. IC Role / Device Role / Timing Role: Secondary voltage rail generator downstream of buck converter, providing low-noise supply for timing-sensitive communication peripherals. Use Value: Delivers 0.003% RMS output noise and 82 dB SVR to suppress switching noise from upstream DC/DC converters, preventing bit errors on CAN FD buses. |
Use Scenario: Biasing precision ADC reference buffers and op-amp signal chains in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Low-drift, low-noise local regulator isolating sensitive analog circuitry from noisy digital supply domains. Use Value: Achieves <0.5% long-term stability over 1000 hours at 125 °C, ensuring measurement repeatability without recalibration in field-deployed equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV1117-18CDR | Lower max current (800 mA), higher dropout (1.2 V typ. @ 800 mA), SO-8 package only | Limited to sub-1 A loads; unsuitable for FPGA core or high-density I/O modules | Select when board space allows SO-8 and load current stays below 0.8 A; not interchangeable for 1.5 A use cases. |
| LD1117DT18TR | Same 1.5 A rating but ±2% output tolerance, TO-252-3 package, no automotive qualification | Higher output variation impacts timing margins in high-speed digital systems | Acceptable for cost-sensitive industrial applications where ±2% tolerance is acceptable and automotive AEC-Q100 compliance is unnecessary. |
Compared with TLV1117-18CDR and LD1117DT18TR, the LD1086V18-DG uniquely combines 1.5 A capability, ±1% tolerance, and DPAK thermal performance-making it the only option among the three qualified for thermally demanding 1.8 V FPGA core regulation in compact industrial enclosures.
Availability
LD1086V18-DG is available at Aetrix Electronics and suitable for industrial PLC I/O modules, FPGA core power supplies, automotive body control units, and test & measurement instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LD1086V18-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, specializing in power management, microcontrollers, sensors, and automotive-grade ICs.
The LD1086 series belongs to ST's high-current LDO portfolio, engineered specifically for industrial and automotive applications demanding robust thermal performance, tight output accuracy, and long-term reliability under continuous load stress.
FAQ
What is the minimum input voltage required for LD1086V18-DG to regulate 1.8 V at 1.5 A?
The LD1086V18-DG requires a minimum input voltage of 3.1 V to maintain regulation at 1.5 A, based on its 1.3 V typical dropout specification. At lower loads, dropout decreases-e.g., ~0.9 V at 500 mA-allowing operation from as low as 2.7 V input in light-load scenarios. Input must remain within absolute maximum rating (30 V).
Can LD1086V18-DG be used with ceramic output capacitors?
Yes-LD1086V18-DG is stable with ceramic output capacitors ≥10 µF, including X5R and X7R types. Unlike many older LDOs, it does not require ESR-based damping; the internal compensation is optimized for low-ESR ceramics, simplifying layout and improving transient response in space-constrained designs.
Does LD1086V18-DG have reverse current protection?
No-the LD1086V18-DG lacks integrated reverse current blocking. If the output voltage exceeds the input (e.g., during hot-swap or backup-battery scenarios), current can flow backward from OUT to IN through the internal pass device. An external Schottky diode in series with the input is recommended for such fault conditions.
Is LD1086V18-DG pin-compatible with adjustable versions of the same family?
Yes-LD1086V18-DG shares identical DPAK pinout (IN, OUTPUT, GND) with adjustable variants like LD1086D2T-R and LD1086DTTR. However, the ADJ/GND pin on fixed versions is internally connected to GND; using an adjustable variant in its place would require modifying the feedback network and may compromise output accuracy without recalibration.
LD1086V18-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):
- 30V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.5V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 82dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
LD1086V18-DG FAQ
1.How can I place an order for LD1086V18-DG through Aetrix?
Please submit a Request for Quotation (RFQ) for LD1086V18-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 LD1086V18-DG reliable?
The price and inventory of LD1086V18-DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1086V18-DG is usually 5 days.
3.What payment methods are accepted for LD1086V18-DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1086V18-DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD1086V18-DG?
LD1086V18-DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD1086V18-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 LD1086V18-DG?
For technical support, including LD1086V18-DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1086V18-DG requirements.
6.How does Aetrix verify that LD1086V18-DG is sourced from the original manufacturer or authorized distributors?
All LD1086V18-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 LD1086V18-DG meets industry standards.
7.What is the process for return or replacement of LD1086V18-DG?
All LD1086V18-DG units undergo pre-shipment inspection (PSI). If there is an issue with LD1086V18-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 LD1086V18-DG part is unused and in its original packaging.
Return procedure for LD1086V18-DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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