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

STMicroelectronics LD1086D2T25TR

Name: LD1086D2T25TR
Brand: STMicroelectronics
SKU: LD1086D2T25TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD1086D2T25TR

Manufacturer:: STMicroelectronics

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

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: LD1086D2T25TR.pdf

Description:: IC REG LINEAR 2.5V 1.5A D2PAK

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Inventory:1,512

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Product details

Overview

LD1086D2T25TR from STMicroelectronics is a fixed-output 2.5 V, 1.5 A low-dropout linear voltage regulator in D²PAK package, featuring ±1% output tolerance at 25 °C, 1.3 V typical dropout at full load, and internal thermal/overcurrent protection. It serves as a stable local power source for microcontrollers, FPGAs, and analog circuitry in industrial control and embedded systems requiring precise, low-noise DC supply.

For engineers reviewing the LD1086D2T25TR datasheet, LD1086D2T25TR pinout, LD1086D2T25TR application, or LD1086D2T25TR equivalent, key selection criteria include guaranteed 1.5 A output current, tight ±1% initial accuracy, dropout performance below 1.5 V across temperature, and compatibility with minimal 10 µF output capacitance for stability.

Technical Context

The LD1086D2T25TR implements a PNP-based LDO architecture with on-chip trimming for high output voltage accuracy and uses an internal reference (1.25 V) to regulate fixed 2.5 V output via resistor-free configuration. Its quiescent current flows into the load-not wasted as bias-improving efficiency over legacy PNP regulators.

It integrates thermal shutdown and current limiting, operates from −40 °C to +125 °C junction temperature, and maintains stability with ≥10 µF ceramic or tantalum output capacitors-no external adjust resistors required for the fixed 2.5 V variant.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.5 V ±1% at 25 °C; ±2% over −40 °C to +125 °C - enables precision analog and digital rail generation without external feedback.
Max Output Current	1.5 A continuous - supports high-current logic, sensor interfaces, and mixed-signal SoCs without derating in standard PCB layouts.
Dropout Voltage	1.3 V typical at 1.5 A - allows operation with input as low as 3.8 V while sustaining 2.5 V output, critical for battery-backed or post-regulation stages.
Quiescent Current	5–10 mA - remains constant across load and input voltage, minimizing no-load power loss in always-on subsystems.
Thermal Protection	Internal junction temperature shutdown at ~150 °C - prevents damage during sustained overload or poor heatsinking without external circuitry.
Stability Capacitor	10 µF minimum CO (ceramic/tantalum) - eliminates need for ESR-tuned capacitors, simplifying layout and reducing BOM count.

Pinout & Package

D²PAK (TO-263-3) package: thermally enhanced surface-mount outline with exposed tab electrically connected to OUTPUT pin; requires solder pad thermal relief per ST's recommended footprint (DocID6739 Rev 38, Fig. 33).

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage supply	Accepts 4.1 V to 30 V DC; must be decoupled with ≥1 µF capacitor close to pin to suppress line transients.
2 (OUTPUT)	Regulated output	Delivers fixed 2.5 V; tab is internally bonded to this pin-PCB copper area must be isolated from other nets unless tied to output ground plane.
3 (GND)	Ground reference	Low-impedance return path for load and internal regulation circuitry; requires short, wide trace to minimize noise coupling.

Key Features

Feature	Design Value
Pin-to-pin compatibility	Matches legacy 3-terminal adjustable regulators (e.g., LM317 footprint), enabling drop-in replacement without layout change.
Load-connected quiescent current	Entire I_Q flows into load-no wasted bias current-increasing effective efficiency by up to 0.7% at 100 mA load vs. conventional PNP LDOs.
Tight initial tolerance	±1% at 25 °C ensures system-level margin compliance without post-production calibration in 2.5 V I/O or ADC reference applications.
Wide operating temperature	−40 °C to +125 °C junction range supports deployment in motor drives, automotive body controllers, and outdoor industrial equipment.
Short-circuit robustness	Sustains 1.5–2.3 A short-circuit current at 5 V dropout-enables safe fault handling without immediate latch-off or external current limiting.

Applications

Industrial PLC I/O Modules

FPGA Core & Auxiliary Rails

Use Scenario: Powering 24 V DC input field I/O modules with isolated 2.5 V logic rails for signal conditioning and communication ICs.

IC Role / Device Role / Timing Role: Primary local LDO delivering clean, regulated 2.5 V to RS-485 transceivers, ADC drivers, and microcontroller peripherals.

Use Value: 1.3 V dropout allows operation from 3.8 V intermediate bus derived from buck converter, reducing heat dissipation versus higher-drop alternatives.

Use Scenario: Supplying FPGA auxiliary banks (e.g., SelectIO™, configuration logic) where tight voltage tolerance prevents timing violations.

IC Role / Device Role / Timing Role: Fixed 2.5 V rail generator with ±1% accuracy ensuring setup/hold margins for LVCMOS25 I/O standards.

Use Value: On-chip trimming eliminates need for external trimming resistors or post-silicon calibration, lowering assembly cost and test time.

Automotive Body Control Units

Medical Sensor Signal Chains

Use Scenario: Regulating 2.5 V for LIN transceivers, EEPROMs, and LED drivers in BCM modules operating across −40 °C to +105 °C ambient.

IC Role / Device Role / Timing Role: Automotive-grade power stage (AEC-Q100 qualified variant available) providing fault-tolerant 2.5 V under load dump and cold crank conditions.

Use Value: Internal thermal shutdown and current limit protect against wiring faults and connector shorts without external protection components.

Use Scenario: Powering low-noise instrumentation amplifiers and sigma-delta ADCs in portable patient monitors and diagnostic sensors.

IC Role / Device Role / Timing Role: Ultra-low-noise (0.003% RMS of V_O) 2.5 V reference rail for precision analog front-ends requiring <10 µV ripple.

Use Value: 82 dB supply rejection at 120 Hz suppresses switching noise from upstream DC/DC converters, preserving SNR in sub-16-bit measurements.

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
TLV1117-25CDR	2.5 V fixed, 800 mA max, 1.2 V dropout at 800 mA, SOT-223 package	Limited to lower current; lacks D²PAK thermal performance for sustained 1.5 A loads	Choose when board space is constrained and peak load ≤800 mA; avoid for thermally demanding 1.5 A applications.
LD1085DT25TR	Same family, 2.5 V fixed, but rated for 3 A output and larger D²PAK-5 package with separate ADJ pin	Higher current capability and adjustable option; not pin-compatible due to 5-pin layout	Choose only if future scalability to >1.5 A or adjustable output is required; LD1086D2T25TR offers optimal size/cost for 1.5 A fixed use.

Compared with TLV1117-25CDR, LD1086D2T25TR delivers 88% higher current capacity and superior thermal resistance (R_thJA = 62.5 °C/W vs. ~120 °C/W), while LD1085DT25TR trades pin compatibility for higher rating-making LD1086D2T25TR the optimal fixed 2.5 V, 1.5 A solution in D²PAK.

Availability

LD1086D2T25TR is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical instrumentation requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant alternatives.

Supply support for LD1086D2T25TR 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The LD1086 series belongs to ST's high-accuracy linear regulator product line, engineered specifically for applications demanding tight voltage tolerance, low dropout, and robust thermal behavior in space-constrained or thermally aggressive environments.

FAQ

What is the minimum input voltage required for LD1086D2T25TR to maintain regulation at 1.5 A?

The minimum input voltage is calculated as V_OUT + V_DROP = 2.5 V + 1.5 V = 4.0 V (max dropout). At 1.5 A and 25 °C, typical dropout is 1.3 V, so 3.8 V suffices. However, worst-case dropout rises to 1.5 V over temperature and load, requiring ≥4.0 V input for guaranteed regulation across full operating conditions.

Can LD1086D2T25TR be used with ceramic output capacitors?

Yes-ST specifies stability with ≥10 µF ceramic (X5R/X7R) or tantalum capacitors. Unlike older LDOs, it does not require ESR-based damping; low-ESR ceramics are fully compatible and recommended for reduced board area and improved transient response.

Is the exposed tab on the D²PAK package electrically connected?

Yes-the metal tab is internally connected to the OUTPUT pin. PCB layout must either tie the tab directly to the 2.5 V output net (for thermal conduction) or isolate it completely; floating or grounding the tab causes functional failure or damage.

Does LD1086D2T25TR require an input bypass capacitor?

Yes-a minimum 1 µF capacitor (ceramic or tantalum) is required at the IN pin, placed as close as possible to the device. This suppresses high-frequency noise and prevents oscillation during line transients, especially when sourced from a switching regulator or long PCB traces.

LD1086D2T25TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 30V

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 1.5V @ 1.5A

Current - Output:: 1.5A

Current - Quiescent (Iq):: 10 mA

Current - Supply (Max):: -

PSRR:: 81dB (120Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

LD1086D2T25TR FAQ

1.How can I place an order for LD1086D2T25TR through Aetrix?

Please submit a Request for Quotation (RFQ) for LD1086D2T25TR 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 LD1086D2T25TR reliable?

The price and inventory of LD1086D2T25TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1086D2T25TR is usually 5 days.

3.What payment methods are accepted for LD1086D2T25TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1086D2T25TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD1086D2T25TR?

LD1086D2T25TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD1086D2T25TR 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 LD1086D2T25TR?

For technical support, including LD1086D2T25TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1086D2T25TR requirements.

6.How does Aetrix verify that LD1086D2T25TR is sourced from the original manufacturer or authorized distributors?

All LD1086D2T25TR 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 LD1086D2T25TR meets industry standards.

7.What is the process for return or replacement of LD1086D2T25TR?

All LD1086D2T25TR units undergo pre-shipment inspection (PSI). If there is an issue with LD1086D2T25TR, 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 LD1086D2T25TR part is unused and in its original packaging.

Return procedure for LD1086D2T25TR:

1.Submit a request within 90 days.

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

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