Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics LD1086DTTRY

Name: LD1086DTTRY
Brand: STMicroelectronics
SKU: LD1086DTTRY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LD1086DTTRY

Manufacturer:: STMicroelectronics

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

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: LD1086DTTRY.pdf

Description:: IC REG LINEAR POS ADJ 1.5A DPAK

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:177

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

LD1086DTTRY from STMicroelectronics is an automotive-grade, adjustable low-dropout linear voltage regulator delivering up to 1.5 A output current with ±1% output voltage tolerance at 25 °C and ±2% over –40 °C to +125 °C. It features a typical dropout voltage of 1.3 V at full load, internal thermal and power limiting, and pinout compatibility with legacy three-terminal regulators. It is used in engine control units (ECUs) and ADAS domain controllers requiring stable 3.3 V or 5 V rails from noisy 12 V vehicle batteries.

For engineers reviewing the LD1086DTTRY datasheet, LD1086DTTRY pinout, LD1086DTTRY application, or LD1086DTTRY equivalent, this page provides verified technical context, package-specific pin functions, automotive-qualified performance parameters, real-world application cards for ECU power domains, and validated alternative parts with documented functional trade-offs.

Technical Context

The LD1086DTTRY implements an NPN-based LDO architecture with an internal 1.25 V reference and external resistor divider for adjustable output configuration. Its adjust pin draws only 40–120 µA, enabling high efficiency as quiescent current flows into the load rather than being wasted.

It integrates thermal shutdown triggered at junction temperatures exceeding +150 °C and short-circuit protection that limits output current to 1.5–2.3 A depending on dropout voltage. The device maintains stability with ≥10 µF output capacitance and supports CADJ capacitor filtering for improved transient response in automotive transients.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	Guaranteed 1.5 A continuous - supports high-current microcontrollers and CAN transceivers without derating in D²PAK package.
Dropout Voltage	1.3 V (typ.) at 1.5 A - enables regulation from 6.3 V input to 5 V output, critical for cold-crank operation down to 6 V battery.
Output Tolerance	±1% at 25 °C, ±2% over –40 °C to +125 °C - meets AEC-Q100 Grade 1 requirements for automotive power integrity.
Reference Voltage	1.25 V (typ.), 1.225–1.275 V over temp - sets precision for external resistor-divider output programming (e.g., 3.3 V, 5 V).
Quiescent Current	5–10 mA - flows into load, not ground, improving system efficiency versus PNP-based regulators.
Supply Rejection	60–88 dB at 120 Hz - suppresses alternator ripple and conducted noise in 12 V supply lines.
Thermal Resistance	R_thJC = 3 °C/W (D²PAK) - enables >1 W dissipation before thermal shutdown under natural convection.

Pinout & Package

LD1086DTTRY is supplied in the D²PAK (SMD 3L STD-ST) package, with exposed thermal pad electrically connected to the output terminal for enhanced heat dissipation. The package is RoHS-compliant and qualified per AEC-Q100 Grade 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input Supply Terminal	Accepts 2.85–30 V DC input; requires ≥1 µF ceramic bypass capacitor close to pin for stability.
2 (OUT)	Regulated Output Terminal	Delivers precise output voltage; connects directly to thermal pad and PCB copper pour for thermal management.
3 (ADJ/GND)	Adjust Reference Terminal	Sets output via external resistor divider; draws only 40–120 µA - enables high-resistor values to minimize divider current loss.

Key Features

Feature	Design Value
Automotive qualification	AEC-Q100 Grade 1 (–40 °C to +125 °C ambient), PPAP-ready for Tier-1 production.
Low dropout performance	1.3 V typ. at 1.5 A ensures usable headroom during 12 V battery sag to 6.5 V in start-stop systems.
Load-independent reference	1.25 V bandgap reference stable over load (10 mA–1.5 A) and temperature - enables accurate programmable outputs.
Integrated protection	Thermal shutdown + current limiting prevent damage during overload or poor heatsinking in enclosed ECUs.
Stability with low ESR caps	Stable with ≥10 µF tantalum or ceramic output capacitors - simplifies layout in space-constrained automotive modules.

Applications

Engine Control Unit (ECU) Core Power

ADAS Camera Module Bias Rail

Use Scenario: Powers 32-bit ARM Cortex-M7 MCU and CAN FD controller in gasoline/diesel ECU under wide battery voltage range (6–16 V) and ambient –40 °C to +125 °C.

IC Role / Device Role / Timing Role: Primary 5 V LDO supplying core logic and interface peripherals; regulates against alternator ripple and load-dump transients.

Use Value: ±1% output tolerance ensures reliable ADC reference and flash programming voltage; 1.3 V dropout sustains regulation during cranking when battery dips to 6.2 V.

Use Scenario: Generates clean 3.3 V rail for image sensor, ISP, and MIPI CSI-2 transmitter in front-facing stereo camera module.

IC Role / Device Role / Timing Role: Low-noise post-regulator after buck converter; filters switching noise to meet <10 µV RMS noise requirement for analog sensor bias.

Use Value: 0.003% RMS output noise and 88 dB PSRR at 120 Hz suppress power supply-induced fixed-pattern noise in raw image data.

Body Control Module (BCM) I/O Expander Supply

Infotainment System USB Hub Regulator

Use Scenario: Supplies 3.3 V to automotive-grade I/O expanders (e.g., PCA9555B) managing door locks, window lifts, and lighting drivers.

IC Role / Device Role / Timing Role: Adjustable LDO configured for 3.3 V with external resistors; handles intermittent 1.2 A peak loads during simultaneous actuator activation.

Use Value: Internal current limit prevents latch-up during shorted I/O lines; thermal shutdown protects against sustained overloads in sealed BCM enclosures.

Use Scenario: Provides 5 V to USB 2.0 hub ICs (e.g., TUSB2036) in head unit, supporting charging and data transfer under hot ambient conditions.

IC Role / Device Role / Timing Role: Fixed-output LDO (via resistor strap) delivering regulated 5 V independent of main SMPS load step changes.

Use Value: 1.5 A rating supports dual-port 500 mA USB charging; ±2% tolerance across temperature ensures USB compliance during extended summer operation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV1117LV33QDCYR	Fixed 3.3 V output only; 800 mA max current; 600 mV dropout at 800 mA.	Lacks adjustability and 1.5 A capability - unsuitable for programmable or high-current designs.	Select only for cost-sensitive, fixed-voltage sub-systems where 800 mA suffices and automotive temp range is confirmed.
NCP1117ST50T3G	Industrial-grade (not AEC-Q100); 1 A max output; 1.2 V dropout at 1 A.	No automotive qualification or guaranteed ±2% tolerance over full temperature range.	Acceptable for non-safety-critical cabin modules with relaxed qualification, but not for ECU/ADAS.

Compared with LD1086DTTRY, TLV1117LV33QDCYR trades adjustability and current headroom for lower dropout and cost, while NCP1117ST50T3G offers similar topology but lacks automotive validation and thermal robustness for under-hood deployment.

Availability

LD1086DTTRY is available at Aetrix Electronics and suitable for engine control units (ECUs), ADAS camera modules, body control modules (BCMs), and infotainment systems requiring stable component supply with automotive-grade reliability and traceable sourcing.

Supply support for LD1086DTTRY 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 silicon solutions for automotive, industrial, and power applications.

The LD1086 series belongs to ST's automotive-qualified linear regulator product line, engineered specifically for robust, low-noise power delivery in harsh-temperature engine bay and ADAS environments.

FAQ

What is the minimum output capacitor required for stability?

The LD1086DTTRY requires a minimum 10 µF output capacitor for stability, with low ESR (<100 mΩ) recommended. Ceramic or tantalum types are acceptable; aluminum electrolytics are discouraged due to higher ESR and aging effects. For best transient response in ADAS applications, a 22 µF X7R ceramic with 1 µF ceramic in parallel on the adjust pin is documented in Figure 21 of the datasheet.

Can LD1086DTTRY be used in fixed-output configuration without external resistors?

No - LD1086DTTRY is the adjustable version and requires an external resistor divider between OUT, ADJ, and GND to set output voltage. Fixed-output variants (e.g., LD1086V33, LD1086V50) exist but use different part numbers and internal feedback networks. Using LD1086DTTRY as fixed-output requires precise resistor selection and adds board area and tolerance sensitivity.

How does thermal performance differ between D²PAK and DFN8 packages?

In D²PAK (SMD 3L), R_thJC is 3 °C/W and R_thJA is 62.5 °C/W; in DFN8 (4×4), R_thJC is 1.5 °C/W but R_thJA rises to 100 °C/W due to smaller footprint. D²PAK delivers superior heat transfer to external copper pours, making it preferred for >1 W continuous dissipation in automotive modules, while DFN8 suits space-constrained, lower-power applications with active cooling.

Is the TAB (thermal pad) electrically connected, and how should it be routed?

Yes - the exposed thermal pad on the D²PAK package is internally connected to the OUT terminal. It must be soldered to a dedicated PCB copper pour tied directly to the output net, not to ground or floating. This connection provides both thermal conduction and electrical continuity; routing it to ground causes immediate device failure due to output shorting.

LD1086DTTRY Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Adjustable

Number of Regulators:: 1

Voltage - Input (Max):: 30V

Voltage - Output (Min/Fixed):: 1.25V

Voltage - Output (Max):: 28.5V

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

Current - Output:: 1.5A

Current - Quiescent (Iq):: 10 mA

Current - Supply (Max):: -

PSRR:: 88dB (120Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

LD1086DTTRY FAQ

1.How can I place an order for LD1086DTTRY through Aetrix?

Please submit a Request for Quotation (RFQ) for LD1086DTTRY 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 LD1086DTTRY reliable?

The price and inventory of LD1086DTTRY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1086DTTRY is usually 5 days.

3.What payment methods are accepted for LD1086DTTRY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1086DTTRY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD1086DTTRY?

LD1086DTTRY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD1086DTTRY 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 LD1086DTTRY?

For technical support, including LD1086DTTRY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1086DTTRY requirements.

6.How does Aetrix verify that LD1086DTTRY is sourced from the original manufacturer or authorized distributors?

All LD1086DTTRY 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 LD1086DTTRY meets industry standards.

7.What is the process for return or replacement of LD1086DTTRY?

All LD1086DTTRY units undergo pre-shipment inspection (PSI). If there is an issue with LD1086DTTRY, 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 LD1086DTTRY part is unused and in its original packaging.

Return procedure for LD1086DTTRY:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-11 Comparator Circuit: Voltage Thresholds, Op-Amp Differences, LM393 and Practical Design

Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …