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

STMicroelectronics LD1086V18

Name: LD1086V18
Brand: STMicroelectronics
SKU: LD1086V18
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD1086V18

Manufacturer:: STMicroelectronics

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

Package:: TO-220-3

Datasheet:: LD1086V18.pdf

Description:: IC REG LINEAR 1.8V 1.5A TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:1,733

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Product details

Overview

LD1086V18 from STMicroelectronics is a fixed-output 1.8 V, 1.5 A low-dropout linear voltage regulator in TO-220 and surface-mount packages. It delivers ±1% output tolerance at 25 °C, maintains regulation down to 1.3 V dropout at full load, and operates across –40 °C to +125 °C for industrial power rails and FPGA core supplies.

For engineers reviewing the LD1086V18 datasheet, LD1086V18 pinout, LD1086V18 application, or LD1086V18 equivalent, key selection criteria include guaranteed 1.5 A output current, thermal-limited short-circuit protection, adjustable or fixed variants, DFN8 (4×4) package option for space-constrained designs, and compatibility with standard 3-terminal regulator footprints.

Technical Context

The LD1086V18 uses a PNP-based pass transistor architecture with on-chip trimming for tight output voltage accuracy. Its reference voltage is internally set to 1.25 V, enabling fixed 1.8 V output via resistor divider integration - eliminating external feedback components required by adjustable versions.

Quiescent current flows into the load rather than being wasted as bias current, improving efficiency over legacy PNP regulators. Internal thermal shutdown and current limiting protect against overload and ambient temperature extremes without requiring external circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.8 V ±1% at 25 °C; ensures stable core supply for 1.8 V logic and memory interfaces
Max Output Current	1.5 A continuous; supports high-current digital loads including microcontrollers and interface ICs
Dropout Voltage	1.3 V typical at 1.5 A; enables operation with input as low as 3.1 V for 1.8 V output
Operating Temp Range	–40 °C to +125 °C junction; qualified for industrial and extended-temperature embedded systems
Output Tolerance	±2% over full temperature range; guarantees system-level voltage margin compliance
Stability Capacitor	10 µF minimum ceramic or tantalum; simplifies layout with no ESR constraints
Quiescent Current	5–10 mA; contributes directly to load current, not dissipated as waste

Pinout & Package

Available in TO-220 (3-pin), DPAK (3-pin), D²PAK (3-pin), D²PAK/A (3-pin), and DFN8 (4×4 mm, 8-pin) packages. The TAB is electrically connected to the OUTPUT pin in all variants.

Pin/Terminal	Circuit Role	Design Meaning
IN	Input voltage supply	Accepts up to 30 V DC; requires local 10 µF input capacitor for stability
OUTPUT	Regulated output node	Connected to exposed thermal pad (TO-220/DPAK/D²PAK); provides 1.8 V @ ≤1.5 A
GND / ADJ	Ground reference or adjust input	Fixed version ties internal divider; serves as return path and thermal conduction point

Key Features

Feature	Design Value
Pin-to-pin compatibility	Replaces legacy 3-terminal adjustable regulators (e.g., LM317) without PCB redesign
Thermal protection	Internal foldback current limit and thermal shutdown prevent damage during sustained overload
Tight output tolerance	±1% at 25 °C enables direct replacement of precision LDOs in noise-sensitive analog subsystems
Low quiescent current utilization	IQ flows into load - improves efficiency by ~5–10% vs. traditional PNP regulators at light loads
Wide package selection	TO-220 for prototyping/heat-sink mounting; DFN8 (4×4) for high-density PCBs with thermal vias

Applications

Industrial PLC I/O Modules

FPGA Core Power Supply

Use Scenario: Providing clean 1.8 V rail to digital I/O banks in programmable logic controllers operating in factory-floor environments.

IC Role / Device Role / Timing Role: Primary low-noise, high-current linear regulator supplying FPGA configuration and I/O banks.

Use Value: ±1% output tolerance and –40 °C to +125 °C operation ensure reliable startup and runtime under thermal cycling and voltage transients.

Use Scenario: Delivering tightly regulated 1.8 V core voltage to Xilinx Artix-7 or Intel Cyclone V FPGA banks with dynamic current demands.

IC Role / Device Role / Timing Role: Fixed-output LDO replacing switching solutions where PSRR > 60 dB and low ripple are mandatory.

Use Value: 82 dB supply rejection at 120 Hz and 0.003% RMS noise meet FPGA vendor requirements for jitter-sensitive clock domains.

Automotive Body Control Units

Medical Sensor Signal Conditioning

Use Scenario: Powering CAN transceivers and microcontroller peripherals in non-safety-critical automotive modules (e.g., door control, lighting).

IC Role / Device Role / Timing Role: Secondary linear regulator downstream of buck converter, providing isolated 1.8 V for communication ICs.

Use Value: Automotive-grade variants (LD1086VY) offer AEC-Q100 qualification and 1.3 V dropout enables use with 12 V battery derated to 9 V during cranking.

Use Scenario: Biasing precision ADC drivers and low-noise op-amps in portable patient monitoring devices.

IC Role / Device Role / Timing Role: Ultra-stable analog supply rail decoupled from noisy digital domains.

Use Value: 0.5% long-term stability over 1000 hours and <0.04 %/W thermal regulation preserve calibration integrity in battery-powered field equipment.

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
TLV1117-18	1.8 V fixed, 800 mA max, 1.2 V dropout, SOT-223 package only	Limited to lower current and single package; lacks DFN8 or TO-220 thermal options	Select when board space is constrained and load current remains ≤800 mA
LD1117S18TR	1.8 V fixed, 800 mA, SO-8 package, higher quiescent current (10 mA typ)	No thermal pad; lower PSRR (70 dB) and wider output tolerance (±2% over temp)	Prefer for cost-sensitive consumer applications where thermal performance is secondary

Compared with TLV1117-18 and LD1117S18TR, the LD1086V18 offers 87.5% higher output current, superior thermal management via multiple thermally enhanced packages, and tighter initial accuracy - making it suitable for industrial and automotive applications demanding robustness and headroom.

Availability

LD1086V18 is available at Aetrix Electronics and suitable for industrial automation, FPGA power delivery, automotive body electronics, and medical sensor subsystems requiring stable component supply across long product lifecycles.

Supply support for LD1086V18 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, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.

The LD1086 series belongs to ST's high-current linear regulator product line, engineered specifically for applications needing reliable, low-noise, fixed-voltage regulation with wide thermal and input voltage margins.

FAQ

What is the minimum input voltage required for LD1086V18 to regulate at full 1.5 A?

The LD1086V18 requires a minimum input voltage of 3.1 V to maintain regulation at 1.5 A output, based on its typical 1.3 V dropout voltage. At lighter loads, dropout decreases - e.g., ~0.5 V at 100 mA - allowing operation from as low as 2.3 V in standby modes.

Can LD1086V18 be used in parallel to increase output current?

No - LD1086V18 is not designed for parallel operation. Its output voltage tolerance and thermal response variations between units can cause current imbalance and potential thermal runaway. For >1.5 A, select a higher-current regulator or use a switching pre-regulator followed by LD1086V18 for noise filtering.

Does LD1086V18 require an output capacitor for stability?

Yes - a minimum 10 µF output capacitor (ceramic or tantalum) is mandatory for stability across all operating conditions. The device does not require specific ESR ranges, unlike older LDOs, simplifying capacitor selection and reducing bill-of-materials complexity.

Is there a lead-free and RoHS-compliant version of LD1086V18?

Yes - all currently manufactured LD1086V18 devices are lead-free and fully RoHS-compliant per EU Directive 2011/65/EU. Packaging markings include "E" suffix indicators (e.g., LD1086V18TR) denoting compliant variants, and material declarations are available through ST's official product pages.

LD1086V18 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 FAQ

1.How can I place an order for LD1086V18 through Aetrix?

Please submit a Request for Quotation (RFQ) for LD1086V18 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 reliable?

The price and inventory of LD1086V18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1086V18 is usually 5 days.

3.What payment methods are accepted for LD1086V18?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1086V18 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD1086V18?

LD1086V18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD1086V18 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?

For technical support, including LD1086V18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1086V18 requirements.

6.How does Aetrix verify that LD1086V18 is sourced from the original manufacturer or authorized distributors?

All LD1086V18 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 meets industry standards.

7.What is the process for return or replacement of LD1086V18?

All LD1086V18 units undergo pre-shipment inspection (PSI). If there is an issue with LD1086V18, 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 part is unused and in its original packaging.

Return procedure for LD1086V18:

1.Submit a request within 90 days.

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

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