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STMicroelectronics LD1086D2T12
- Part No.:
- LD1086D2T12
- Manufacturer:
- STMicroelectronics
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
LD1086D2T12.pdf
- Description:
- IC REG LINEAR 12V 1.5A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,241
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Product details
Overview
LD1086D2T12 from STMicroelectronics is a fixed-output 12 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 delivers stable power to microcontroller cores, industrial I/O modules, and automotive body electronics where input-to-output differential is constrained.
For engineers reviewing the LD1086D2T12 datasheet, LD1086D2T12 pinout, LD1086D2T12 application, or LD1086D2T12 equivalent, key selection criteria include dropout voltage at 1.5 A, output accuracy across –40 °C to +125 °C, quiescent current behavior under varying load, and compatibility with minimal 10 µF output capacitance for stability.
Technical Context
The LD1086D2T12 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 12 V output via precision resistor ratio feedback embedded in the die - eliminating external adjustment components.
Thermal regulation is managed by integrated junction temperature sensing and foldback current limiting. Dropout voltage remains ≤1.5 V up to 1.5 A across the full operating temperature range, and quiescent current flows into the load rather than being wasted as bias current - improving efficiency versus legacy regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±1% at 25 °C; ±2% over –40 °C to +125 °C - ensures reliable logic-level supply for 12 V–rated MCUs and sensors. |
| Max Output Current | 1.5 A guaranteed - supports high-current peripherals like CAN transceivers or motor drivers without external boosting. |
| Dropout Voltage | 1.3 V typical at 1.5 A - enables operation from 13.3 V input, critical for automotive battery-sourced systems during cold-crank (≥9 V). |
| Quiescent Current | 5–10 mA - flows into load, not ground, increasing net efficiency; stable across input voltage and load variations. |
| Operating Temp | –40 °C to +125 °C junction - qualified for under-hood automotive, industrial PLC, and outdoor telecom applications. |
| Stability Capacitor | Minimum 10 µF ceramic or tantalum output capacitor - simplifies layout and reduces BOM count vs. regulators requiring >47 µF. |
| Protection | Internal thermal shutdown and current limiting - prevents damage during sustained overload or ambient overheating. |
Pinout & Package
LD1086D2T12 is housed in a surface-mount D²PAK (SMD 2L STD-ST) package with exposed thermal pad. The TAB is electrically connected to the OUTPUT pin, enabling direct thermal coupling to PCB copper pour for enhanced power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input Supply | Accepts 13.3 V to 30 V DC; must be decoupled with ≥1 µF near pin to suppress line transients. |
| 2 (OUTPUT / TAB) | Regulated Output & Thermal Path | Delivers 12 V @ up to 1.5 A; metal TAB is electrically tied to output and serves as primary heat sink interface. |
| 3 (GND) | Ground Reference | Low-impedance return path for load and internal regulation circuitry; requires dedicated ground plane connection. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-to-pin compatible with older 3-terminal adjustable regulators | Enables drop-in replacement of LM317-based designs without PCB redesign - preserves legacy system layouts. |
| On-chip trimmed output voltage | Achieves ±1% initial accuracy at 25 °C - eliminates need for external calibration or post-production trimming. |
| Load-referred quiescent current | Quiescent current adds directly to load current - improves system efficiency by ~3–5% vs. ground-referenced regulators. |
| Wide input voltage range | Supports 13.3 V to 30 V inputs - accommodates 12 V automotive systems (including load-dump transients) and industrial 24 V rails. |
| Thermal resistance (RthJA) | 62.5 °C/W in D²PAK - enables 1.5 A operation at ≤75 °C ambient with 2 cm² 2-oz copper pour, verified per Figure 27. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
|
Use Scenario: Supplies 12 V to microcontroller, LIN transceivers, and LED drivers in door module ECUs. IC Role / Device Role / Timing Role: Primary 12 V LDO for safety-critical sub-systems requiring stable voltage during battery dips to 9 V. Use Value: 1.3 V dropout ensures uninterrupted operation during cold-crank; ±2% tolerance maintains MCU reset threshold integrity. |
Use Scenario: Powers isolated digital input conditioning circuits and relay drivers in modular PLC backplanes. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 24 V bus to clean 12 V for optocoupler bias and level-shifting. Use Value: 10 µF stability requirement reduces footprint vs. legacy regulators needing 47 µF; D²PAK thermal performance sustains 1.5 A continuously. |
| Medical Infusion Pump Controller | Telecom Remote Radio Unit |
|
Use Scenario: Provides noise-sensitive 12 V rail to stepper motor drivers and analog front-end ADCs. IC Role / Device Role / Timing Role: Low-noise, thermally robust LDO ensuring precise motor positioning and signal acquisition fidelity. Use Value: 0.003% RMS output noise minimizes ADC quantization error; internal thermal limit prevents fault propagation during motor stall. |
Use Scenario: Generates 12 V for RF power amplifier biasing and FPGA configuration in outdoor small-cell base stations. IC Role / Device Role / Timing Role: High-current, high-temp LDO operating in sealed enclosures with limited airflow. Use Value: 125 °C max junction rating and 62.5 °C/W RthJA enable full 1.5 A output at 85 °C ambient - validated per Table 2 and Figure 27. |
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 |
|---|---|---|---|
| LD1086V12 | Same silicon, TO-220 package; RthJA = 50 °C/W vs. 62.5 °C/W; no exposed thermal pad. | Better suited for through-hole prototyping or lower-power (<1 A) applications with heatsink mounting. | Select when mechanical mounting constraints favor TO-220 or when thermal design includes external heatsink. |
| TLV1117-12 | 1 A max output; 1.2 V dropout at 1 A; ±2% output tolerance; SOT-223 package; higher quiescent current (5–10 mA, ground-referenced). | Limited to <1 A loads; less suitable for automotive cold-crank due to higher dropout and narrower temp range (–40 °C to +125 °C only for Q1 grade). | Choose only for cost-sensitive, space-constrained designs where 1 A suffices and thermal margin is ample. |
Compared with LD1086V12, the D²PAK variant offers superior thermal performance in compact SMT layouts; versus TLV1117-12, LD1086D2T12 provides 50% higher current, tighter voltage tolerance, and load-referred quiescent current - making it preferable for demanding automotive and industrial 12 V point-of-load applications.
Availability
LD1086D2T12 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O subsystems, and medical infusion pump controllers requiring stable component supply with extended temperature support and high-current capability.
Supply support for LD1086D2T12 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.
The LD1086 series was designed specifically for high-reliability 12 V and 5 V point-of-load regulation in automotive and industrial environments - emphasizing dropout performance, thermal resilience, and long-term voltage stability.
FAQ
What is the minimum input voltage required for LD1086D2T12 to maintain 12 V output at 1.5 A?
The minimum input voltage is 13.3 V, calculated as 12 V + 1.3 V typical dropout. At elevated temperatures or maximum load, dropout may reach 1.5 V, requiring ≥13.5 V input for guaranteed regulation. Input must remain below 30 V absolute maximum rating.
Can LD1086D2T12 operate without an input bypass capacitor?
No - a minimum 1 µF ceramic or tantalum capacitor is required at the IN pin, placed within 5 mm of the device, to prevent oscillation and suppress line transients. Omission risks instability, especially during fast input voltage changes such as automotive load dump.
Is the D²PAK thermal pad of LD1086D2T12 electrically isolated?
No - the metal TAB is internally connected to the OUTPUT pin. PCB land pattern must tie the thermal pad directly to the 12 V output copper pour. Isolating the pad creates a thermal bottleneck and violates the device's safe operating area.
Does LD1086D2T12 require an external adjust capacitor for stability?
No - unlike adjustable versions (e.g., LD1086DT), the fixed-output LD1086D2T12 does not use an ADJ pin and therefore has no CADJ requirement. Stability is ensured with only the 10 µF output capacitor specified in the datasheet.
LD1086D2T12 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):
- 12V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.5V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 71dB (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
LD1086D2T12 FAQ
1.How can I place an order for LD1086D2T12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD1086D2T12 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 LD1086D2T12 reliable?
The price and inventory of LD1086D2T12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1086D2T12 is usually 5 days.
3.What payment methods are accepted for LD1086D2T12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1086D2T12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD1086D2T12?
LD1086D2T12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD1086D2T12 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 LD1086D2T12?
For technical support, including LD1086D2T12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1086D2T12 requirements.
6.How does Aetrix verify that LD1086D2T12 is sourced from the original manufacturer or authorized distributors?
All LD1086D2T12 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 LD1086D2T12 meets industry standards.
7.What is the process for return or replacement of LD1086D2T12?
All LD1086D2T12 units undergo pre-shipment inspection (PSI). If there is an issue with LD1086D2T12, 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 LD1086D2T12 part is unused and in its original packaging.
Return procedure for LD1086D2T12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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