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STMicroelectronics LD1086DT33TR
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- Part No.:
- LD1086DT33TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LD1086DT33TR.pdf
- Description:
- IC REG LINEAR 3.3V 1.5A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:10,001
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Product details
Overview
LD1086DT33TR from STMicroelectronics is a fixed-output 3.3 V, 1.5 A low-dropout linear voltage regulator in DPAK package, featuring ±1% output tolerance at 25 °C, 1.3 V typical dropout at full load, and internal thermal/overcurrent protection. It delivers stable power to microcontroller cores, FPGA I/O banks, and industrial sensor signal chains where input-to-output headroom is constrained.
For engineers reviewing the LD1086DT33TR datasheet, LD1086DT33TR pinout, LD1086DT33TR application, or LD1086DT33TR equivalent, this page provides verified pin functions, real-world stability requirements (10 µF min. output capacitor), thermal resistance data (RthJA = 33 °C/W), and validated alternatives for 3.3 V LDO replacement in space- and thermally-constrained designs.
Technical Context
The LD1086DT33TR uses a PNP-based pass transistor architecture with on-chip trimming for tight output voltage accuracy. Its quiescent current flows into the load-not wasted as bias-improving efficiency over legacy regulators. Dropout voltage remains ≤1.5 V across –40 °C to 125 °C junction temperature.
It requires only a single 10 µF ceramic or tantalum output capacitor for stability and supports operation with input voltages up to 30 V. Internal protection includes thermal shutdown and current limiting, with short-circuit current scaling inversely with dropout voltage (e.g., 1.5 A at 5 V dropout, 0.05 A at 25 V dropout).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1% at 25 °C; ±2% over –40 °C to 125 °C - enables direct powering of 3.3 V logic without external feedback resistors. |
| Max Output Current | 1.5 A continuous - sufficient for SoC core rails or multi-channel ADC/DAC supplies. |
| Dropout Voltage | 1.3 V typical at 1.5 A - allows operation from 4.6 V input (e.g., 5 V rail with ripple) while maintaining regulation. |
| Quiescent Current | 5–10 mA - flows into load, not ground, improving light-load efficiency vs. traditional PNP LDOs. |
| Thermal Resistance | RthJA = 33 °C/W (DPAK) - enables 1.5 A operation up to +85 °C ambient with minimal heatsinking. |
| Stability Capacitor | 10 µF minimum CO - compatible with low-ESR ceramic capacitors; no ESR requirement simplifies BOM. |
| PSRR | 79 dB at 120 Hz, 1.5 A load - suppresses ripple from noisy DC-DC pre-regulators feeding sensitive analog circuitry. |
Pinout & Package
DPAK (TO-252) package: surface-mount, 3-pin, exposed thermal pad connected to OUTPUT pin; footprint per ST DocID6739 Rev 38 Figure 30.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 4.9 V to 30 V DC; must be decoupled with ≥1 µF near pin to limit high-frequency noise coupling. |
| 2 (OUTPUT) | Regulated output & thermal pad connection | Delivers 3.3 V; thermal pad must be soldered to PCB copper pour for RthJA = 33 °C/W performance. |
| 3 (GND) | Ground reference | Low-impedance return path for load current and internal bias; separate trace from power ground recommended for noise-sensitive loads. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-to-pin compatibility | Matches legacy 3-terminal adjustable regulators (e.g., LM317 footprint), enabling drop-in upgrade without layout change. |
| Tight output tolerance | ±1% at 25 °C via on-chip trimming - eliminates need for post-production calibration in precision 3.3 V systems. |
| Load-dependent quiescent current | Iq flows into load, not ground - improves efficiency by ~5–10% at light loads (<100 mA) vs. standard PNP LDOs. |
| Wide operating temperature | –40 °C to +125 °C junction range - qualified for industrial motor drives and automotive body control modules. |
| Robust short-circuit behavior | Current limits to 1.5 A at low dropout, de-rating to 0.05 A at 25 V dropout - prevents thermal runaway during sustained fault conditions. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Powering isolated digital I/O drivers and analog sensor front-ends in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3 V LDO for microcontroller peripherals and RS-485 transceivers. Use Value: 1.3 V dropout enables use with 5 V intermediate bus; ±1% tolerance ensures reliable SPI/I²C timing margin under wide temperature swings. |
Use Scenario: Supplying door module ECUs with LIN transceivers, LED drivers, and position sensors. IC Role / Device Role / Timing Role: Fixed 3.3 V rail for MCU and CAN/LIN interface ICs in AEC-Q100-compliant designs (via LD1086VY variant). Use Value: RthJA = 33 °C/W allows full 1.5 A output without heatsink in sealed enclosures; thermal shutdown prevents latch-up during load dump events. |
| Medical Patient Monitoring | Test & Measurement Equipment |
|
Use Scenario: Providing clean 3.3 V power to low-noise amplifiers and 24-bit delta-sigma ADCs in portable ECG units. IC Role / Device Role / Timing Role: Post-regulator after switching converter to reduce ripple-induced measurement error. Use Value: 79 dB PSRR at 120 Hz suppresses switching artifacts; 0.003% RMS noise ensures <1 LSB error in 24-bit conversions. |
Use Scenario: Biasing precision DACs, op-amps, and reference buffers in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: Low-drift, low-noise 3.3 V source for analog signal chain components requiring stable headroom. Use Value: ±2% output tolerance over temperature maintains absolute accuracy of 3.3 V references; 0.5% long-term stability reduces recalibration frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output 3.3 V LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV1117-33CDCR | Lower max current (800 mA), higher dropout (1.2 V typ. @ 800 mA), SOT-223 package (RthJA = 60 °C/W) | Suitable for lower-power MCU applications; insufficient for 1.5 A loads or high-ambient environments. | Select when board space is critical and load current ≤800 mA; verify thermal margin with 60 °C/W RthJA. |
| MIC29302WU | Higher dropout (0.4 V @ 3 A), wider input range (4–26 V), TO-263 package (RthJA = 25 °C/W) | Better thermal performance but larger footprint; not pin-compatible with DPAK. | Choose for higher-current or lower-dropout needs where layout revision is acceptable and thermal budget is tight. |
Compared with TLV1117-33CDCR, LD1086DT33TR delivers 88% more output current and 2.3× better thermal resistance; versus MIC29302WU, it offers DPAK compatibility and tighter initial tolerance (±1% vs. ±2%), though at slightly higher dropout.
Availability
LD1086DT33TR is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply, long-lifecycle support, and AEC-Q100-qualified variants (LD1086VY).
Supply support for LD1086DT33TR 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, specializing in power management, microcontrollers, and automotive-grade ICs with vertical manufacturing control.
The LD1086 series targets cost-sensitive, high-reliability linear regulation in industrial and automotive applications, emphasizing thermal robustness, pin compatibility with legacy designs, and tight DC accuracy without external components.
FAQ
What is the minimum input voltage required for LD1086DT33TR to regulate at 3.3 V?
The minimum input voltage is 4.6 V: 3.3 V output plus 1.3 V typical dropout. At full 1.5 A load, input must exceed 4.6 V to maintain regulation; derating is required above 125 °C junction temperature where dropout increases to 1.5 V.
Can LD1086DT33TR be used with ceramic output capacitors?
Yes - it is stable with low-ESR ceramic capacitors ≥10 µF. Unlike older LDOs, it imposes no minimum ESR requirement, eliminating the need for series resistors or tantalum alternatives and reducing cost and board area.
How does the thermal pad connection affect performance?
The exposed thermal pad (pin 2) is electrically tied to OUTPUT and must be soldered to a ≥1 cm² copper pour. Without proper thermal pad soldering, RthJA degrades from 33 °C/W to >60 °C/W, limiting usable current to <800 mA at +70 °C ambient.
Is there an automotive-grade version of LD1086DT33TR?
Yes - LD1086VY is the AEC-Q100 qualified variant, tested for automotive temperature range (–40 °C to +125 °C) and humidity exposure. It shares identical electrical specs and DPAK packaging but includes extended reliability screening and traceable lot documentation.
LD1086DT33TR 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:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.5V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 79dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
LD1086DT33TR FAQ
1.How can I place an order for LD1086DT33TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LD1086DT33TR 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 LD1086DT33TR reliable?
The price and inventory of LD1086DT33TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1086DT33TR is usually 5 days.
3.What payment methods are accepted for LD1086DT33TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1086DT33TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD1086DT33TR?
LD1086DT33TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD1086DT33TR 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 LD1086DT33TR?
For technical support, including LD1086DT33TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1086DT33TR requirements.
6.How does Aetrix verify that LD1086DT33TR is sourced from the original manufacturer or authorized distributors?
All LD1086DT33TR 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 LD1086DT33TR meets industry standards.
7.What is the process for return or replacement of LD1086DT33TR?
All LD1086DT33TR units undergo pre-shipment inspection (PSI). If there is an issue with LD1086DT33TR, 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 LD1086DT33TR part is unused and in its original packaging.
Return procedure for LD1086DT33TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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