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STMicroelectronics LD1086D2T33
- Part No.:
- LD1086D2T33
- Manufacturer:
- STMicroelectronics
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
LD1086D2T33.pdf
- Description:
- IC REG LINEAR 3.3V 1.5A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,807
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Product details
Overview
LD1086D2T33 from STMicroelectronics is a fixed-output 3.3 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 for industrial power rails and embedded system supplies.
For engineers reviewing the LD1086D2T33 datasheet, LD1086D2T33 pinout, LD1086D2T33 application, or LD1086D2T33 equivalent, key selection criteria include dropout voltage under 1.5 A load, output stability across –40 °C to 125 °C, minimum external capacitance (10 µF), and compatibility with legacy 3-terminal regulator footprints.
Technical Context
The LD1086D2T33 implements a PNP-based LDO architecture with on-chip trimmed reference (1.25 V) and error amplifier, delivering fixed 3.3 V output without external resistors. Its quiescent current flows into the load-not wasted as bias-improving efficiency over traditional PNP regulators.
Dropout voltage remains stable at ≤1.5 V up to 1.5 A across temperature, supported by internal current limiting and thermal shutdown. The device requires only a single 10 µF output capacitor for stability and exhibits 79 dB supply voltage rejection at 120 Hz with 25 µF output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1% at 25 °C; ensures precise MCU core/I/O rail compliance without trimming. |
| Max Output Current | 1.5 A continuous; supports high-current peripherals like Ethernet PHYs or FPGA I/O banks. |
| Dropout Voltage | 1.3 V typical at 1.5 A; enables operation from 4.9 V input (e.g., 5 V bus with ripple) while maintaining regulation. |
| Operating Temp | –40 °C to +125 °C junction; qualified for industrial and extended-temperature embedded control applications. |
| Quiescent Current | 5–10 mA; flows into load, not ground-reducing total system power loss vs. standard PNP regulators. |
| SVR @ 120 Hz | 79 dB with 25 µF CO; suppresses ripple from switching pre-regulators feeding the LDO input. |
| Stability Cap | 10 µF minimum ceramic or tantalum CO; simplifies layout and lowers BOM cost vs. higher-capacitance alternatives. |
Pinout & Package
D²PAK (TO-263-3) package with exposed thermal pad; pin 1 = Input, pin 2 = Ground, pin 3 = Output; metal tab electrically connected to output for enhanced thermal conduction and PCB heat spreading.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Input voltage supply | Accepts 4.9–30 V DC; must be decoupled with ≥1 µF local ceramic capacitor. |
| Pin 2 (GND) | Ground reference | Low-impedance return path for feedback and regulation circuitry; ties to system ground plane. |
| Pin 3 (OUT) | Regulated output | Delivers stable 3.3 V; connects directly to load and 10 µF output capacitor; tab is electrically tied to this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-to-pin compatible | Replaces legacy adjustable LDOs (e.g., LM317) in existing layouts without footprint change. |
| Thermal shutdown | Activates at ~160 °C junction; latches off until cooldown-prevents damage during overload or poor heatsinking. |
| Current limit | Internally set to ~1.5–2.3 A; protects against short-circuit faults without external sensing components. |
| Load regulation | ≤25 mV over 0–1.5 A load; maintains <0.8% output deviation-critical for ADC reference or sensor analog rails. |
| Line regulation | ≤6 mV over 4.9–18 V input; rejects input bus variation-enables use after unregulated 5 V or 12 V SMPS stages. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powering isolated digital I/O drivers and CAN transceivers in modular PLC backplanes with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary 3.3 V rail regulator supplying microcontroller, optocouplers, and level-shifters; no timing function. Use Value: 1.3 V dropout allows direct regulation from 5 V intermediate bus even at full 1.5 A load, eliminating need for cascaded converters. |
Use Scenario: Providing clean 3.3 V for microcontroller core and LIN transceiver in body electronics modules operating from 9–16 V battery. IC Role / Device Role / Timing Role: Fixed-output LDO for logic supply; not involved in clock generation or signal timing. Use Value: ±1% output tolerance ensures reliable boot and flash programming across automotive temperature range (–40 °C to +125 °C). |
| Medical Patient Monitor Front-End | Networking Switch Management Controller |
|
Use Scenario: Supplying analog front-end (AFE) and low-noise ADC in portable patient monitors where EMI immunity and stability are critical. IC Role / Device Role / Timing Role: Low-noise 3.3 V analog rail regulator; RMS noise 0.003% of VO supports 16-bit ADC accuracy. Use Value: 79 dB SVR suppresses switching noise from upstream DC/DC converters, preventing measurement artifacts in vital sign acquisition. |
Use Scenario: Powering ARM-based management SoC and EEPROM in enterprise Ethernet switches requiring long-term reliability. IC Role / Device Role / Timing Role: Main 3.3 V logic supply for baseboard management controller (BMC); no real-time clock or PLL involvement. Use Value: 1000-hour long-term stability <0.5% ensures consistent firmware execution and memory interface timing margins over product lifetime. |
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 |
|---|---|---|---|
| LD1086DTTR | Same electrical specs but TO-220 package; RthJA = 50 °C/W vs. D²PAK's 62.5 °C/W; larger footprint, no surface-mount capability. | Suitable for prototyping or low-volume through-hole assemblies; less optimal for automated SMT production. | Select when mechanical mounting constraints favor through-hole or when heatsink attachment is preferred over PCB copper area. |
| TLV1117-33CDCY | Lower max current (800 mA), higher dropout (1.2 V typ. @ 800 mA), ±2% tolerance; smaller SOT-223 package. | Targeted at space-constrained, lower-power applications; insufficient for 1.5 A loads without derating. | Choose only if load current stays below 800 mA and board area is severely limited-cannot replace LD1086D2T33 in full-spec designs. |
Compared with LD1086DTTR, the D²PAK variant offers superior thermal performance in compact SMT layouts; versus TLV1117-33CDCY, it delivers 88% higher current capacity and tighter voltage accuracy-making it the sole choice for 1.5 A, precision 3.3 V industrial rails.
Availability
LD1086D2T33 is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, medical diagnostic equipment, and networking infrastructure requiring stable component supply with full production lifecycle support.
Supply support for LD1086D2T33 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, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
The LD1086 series targets cost-sensitive, high-reliability linear regulation needs in industrial and automotive systems-emphasizing robustness, wide temperature operation, and drop-in compatibility with legacy designs.
FAQ
What is the minimum input voltage required for LD1086D2T33 to maintain 3.3 V output at 1.5 A?
The minimum input voltage is 4.9 V, derived from the 3.3 V output plus maximum guaranteed dropout of 1.5 V at 1.5 A. Below this, regulation fails and output drops linearly with input. This value is confirmed in Table 5 (Electrical Characteristics of LD1086#33) under "VI = 4.9 to 30 V" test condition for full-load operation.
Can LD1086D2T33 be used without an input capacitor?
No-STMicroelectronics specifies a minimum 1 µF ceramic or tantalum input capacitor placed within 1 cm of the IN pin to prevent oscillation and ensure stability under transient load conditions. Omission risks high-frequency instability and potential damage during line transients, as validated in Figure 22–24 of the datasheet.
Is the D²PAK thermal pad required to be soldered to PCB copper?
Yes-the exposed thermal pad (connected internally to the output pin) must be soldered to a minimum 100 mm² copper pour with ≥4 thermal vias to internal ground or power planes. Without this, junction temperature exceeds safe limits at >1 A load due to RthJA rising from 62.5 °C/W to >100 °C/W, per Section 7.3 mechanical data.
Does LD1086D2T33 support reverse polarity protection?
No-it lacks integrated reverse-voltage protection. Applying negative voltage to the IN pin relative to GND can cause latch-up or permanent damage. External protection (e.g., series Schottky diode or ideal diode controller) is required in battery-powered or hot-swap applications where polarity reversal is possible.
LD1086D2T33 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- D2PAK
LD1086D2T33 FAQ
1.How can I place an order for LD1086D2T33 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD1086D2T33 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 LD1086D2T33 reliable?
The price and inventory of LD1086D2T33 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1086D2T33 is usually 5 days.
3.What payment methods are accepted for LD1086D2T33?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1086D2T33 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD1086D2T33?
LD1086D2T33 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD1086D2T33 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 LD1086D2T33?
For technical support, including LD1086D2T33 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1086D2T33 requirements.
6.How does Aetrix verify that LD1086D2T33 is sourced from the original manufacturer or authorized distributors?
All LD1086D2T33 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 LD1086D2T33 meets industry standards.
7.What is the process for return or replacement of LD1086D2T33?
All LD1086D2T33 units undergo pre-shipment inspection (PSI). If there is an issue with LD1086D2T33, 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 LD1086D2T33 part is unused and in its original packaging.
Return procedure for LD1086D2T33:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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