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STMicroelectronics LD1086V
- Part No.:
- LD1086V
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LD1086V.pdf
- Description:
- IC REG LINEAR POS ADJ 1.5A TO220
- Quantity:
- Payment:
- Shipping:
Inventory:2,149
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Product details
Overview
LD1086V from STMicroelectronics is a 1.5 A low-dropout positive voltage regulator with fixed 5 V output, ±1% initial tolerance at 25 °C, 1.3 V typical dropout at full load, and operation across –40 °C to +125 °C. It delivers stable power for microcontroller core supplies, industrial I/O modules, and automotive body control units requiring high accuracy and thermal robustness.
For engineers reviewing the LD1086V datasheet, LD1086V pinout, LD1086V application, or LD1086V equivalent, this page provides verified pin functions, real-world stability requirements (10 µF min. output capacitor), thermal derating guidance (RthJA = 33 °C/W in DPAK), and validated alternatives for fixed 5 V LDO replacement in space-constrained PCBs.
Technical Context
The LD1086V implements a PNP-based LDO architecture with internal bandgap reference (1.25 V) and error amplifier, enabling precise output regulation without external feedback resistors. Its quiescent current flows into the load-not wasted as base current-improving efficiency over legacy PNP regulators.
It integrates thermal shutdown and short-circuit protection, supports adjustable configurations via the ADJ pin (when used as LD1086), and maintains stability with only a 10 µF ceramic or tantalum output capacitor-no ESR constraints required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1% at 25 °C; ±2% over –40 °C to +125 °C - ensures MCU core logic compatibility without calibration. |
| Max Output Current | 1.5 A continuous - sufficient for dual-core microcontrollers or multi-channel sensor interfaces. |
| Dropout Voltage | 1.3 V typical at 1.5 A - enables 6.3 V input to sustain 5 V output under full load, reducing heatsink requirements. |
| Quiescent Current | 5–10 mA - flows into load, not ground, improving light-load efficiency vs. traditional PNP LDOs. |
| Input Voltage Range | 6.6 V to 30 V - compatible with 12 V automotive and industrial rails after upstream buck conversion. |
| Thermal Resistance | RthJA = 33 °C/W (DPAK) - allows ~1.2 W dissipation at 50 °C ambient before thermal shutdown. |
| Stability Capacitor | 10 µF minimum CO (ceramic/tantalum) - eliminates need for ESR-tuned capacitors, simplifying BOM. |
Pinout & Package
LD1086V is available in DPAK (TO-252) package: thermally enhanced surface-mount outline with exposed tab electrically connected to OUTPUT. Pin 1 = INPUT, Pin 2 = GND, Pin 3 = OUTPUT (tab).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Regulator Input | Accepts unregulated DC input (6.6–30 V); requires local 1 µF ceramic bypass capacitor. |
| Pin 2 (GND) | Ground Reference | Common return for internal circuitry and external capacitor; must be low-impedance path to system ground plane. |
| Pin 3 (OUT) | Regulated Output | Delivers fixed 5 V; tab is internally bonded to this pin-requires thermal pad connection to copper pour for heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-to-pin compatibility | Matches legacy 3-terminal adjustable regulators (e.g., LM317 footprint), enabling drop-in upgrade with improved dropout and tolerance. |
| Load-connected quiescent current | 5–10 mA flows into load instead of ground-increases effective efficiency by ~0.3% at 100 mA output. |
| Wide temperature range | –40 °C to +125 °C junction operation-qualified for under-hood automotive and industrial motor drive environments. |
| Internal protection | Thermal shutdown and current limiting activate before damage-no external foldback circuitry needed. |
| Tight output tolerance | ±1% at 25 °C (±2% over full temp range)-reduces need for post-regulation monitoring or software compensation. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit (BCU) |
|---|---|
|
Use Scenario: Powering isolated digital I/O drivers and ADC reference circuits in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 5 V rail regulator supplying FPGA configuration banks and optocoupler LED drivers. Use Value: 1.3 V dropout enables use of 7 V intermediate rail from upstream buck converter, minimizing heat generation in confined enclosures. |
Use Scenario: Supplying microcontroller, CAN transceiver, and window lift motor driver ICs in door module assemblies. IC Role / Device Role / Timing Role: Main 5 V domain regulator meeting AEC-Q100 Grade 2 (–40 °C to +105 °C ambient) requirements. Use Value: ±1% output tolerance ensures reliable brown-out detection thresholds and analog sensor reference stability across temperature extremes. |
| Medical Patient Monitor Front-End | Point-of-Sale Terminal Power Management |
|
Use Scenario: Generating clean 5 V for ECG signal conditioning amplifiers and display backlight drivers. IC Role / Device Role / Timing Role: Low-noise (0.003% RMS) post-regulator following a switching supply to reduce conducted EMI. Use Value: 10 µF stability requirement allows use of small-case X7R ceramics-reducing board area vs. electrolytic solutions. |
Use Scenario: Providing regulated 5 V to thermal printer head, EMV smart card reader, and touchscreen controller. IC Role / Device Role / Timing Role: Secondary LDO delivering noise-immune power where USB host port cannot meet ripple specs. Use Value: DPAK package enables automated reflow assembly and 33 °C/W thermal resistance supports fanless enclosure design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed 5 V LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV1117-50 | Lower max current (800 mA), higher dropout (1.2 V typ. @ 800 mA), ±2% tolerance. | Not suitable for 1.5 A loads; better for cost-sensitive consumer designs with lighter loads. | Select when board space is constrained (SOT-223) and full 1.5 A capability is unnecessary. |
| NCP1117ST50T3G | Same 1.5 A rating but ±2% tolerance, 1.1 V dropout @ 800 mA (not specified at 1.5 A), no automotive grade variant. | Lacks AEC-Q100 qualification; RthJA = 60 °C/W (SOT-223) limits power handling. | Choose for non-automotive industrial use where ±2% tolerance is acceptable and thermal margin is adequate. |
Compared with TLV1117-50 and NCP1117ST50T3G, the LD1086V offers tighter initial tolerance (±1% vs. ±2%), guaranteed 1.3 V dropout at 1.5 A, and DPAK thermal performance-making it preferred for high-reliability 5 V rails where precision and thermal headroom are critical.
Availability
LD1086V is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical front-end electronics, and point-of-sale terminals requiring stable component supply with long lifecycle assurance.
Supply support for LD1086V 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 analog ICs.
The LD1086V belongs to ST's high-current LDO family designed for industrial and automotive systems demanding precision regulation, thermal resilience, and pin-compatible upgrades to legacy linear regulators.
FAQ
What is the minimum output capacitance required for LD1086V stability?
The LD1086V requires a minimum 10 µF output capacitor-ceramic or tantalum-with no ESR constraints. This value ensures phase margin >45° across temperature and load. Using smaller values risks oscillation; larger values improve transient response but add cost and size.
Can LD1086V replace LM7805 in existing designs?
No-LM7805 is a 78xx-series non-LDO regulator requiring ≥2 V headroom and dissipating significantly more heat. LD1086V needs only 1.3 V dropout but uses different pinout (IN-GND-OUT vs. IN-OUT-GND) and lacks built-in current limiting above 1.5 A. Layout and thermal redesign are mandatory.
Does LD1086V support adjustable output voltages?
Only the base LD1086 (not LD1086V) supports adjustable outputs via the ADJ pin. The "V" suffix denotes fixed 5 V version with internal resistor divider; its ADJ pin is not accessible-it is internally connected and not brought out to a package terminal.
Is LD1086V qualified for automotive applications?
The LD1086V itself is not automotive-qualified; however, the pin-compatible LD1086VY variant meets AEC-Q100 Grade 2 (–40 °C to +105 °C ambient) and is manufactured in ST's certified automotive lines. For new automotive designs, LD1086VY is the recommended drop-in replacement.
LD1086V Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
LD1086V FAQ
1.How can I place an order for LD1086V through Aetrix?
Please submit a Request for Quotation (RFQ) for LD1086V 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 LD1086V reliable?
The price and inventory of LD1086V are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1086V is usually 5 days.
3.What payment methods are accepted for LD1086V?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1086V transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD1086V?
LD1086V orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD1086V 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 LD1086V?
For technical support, including LD1086V datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1086V requirements.
6.How does Aetrix verify that LD1086V is sourced from the original manufacturer or authorized distributors?
All LD1086V 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 LD1086V meets industry standards.
7.What is the process for return or replacement of LD1086V?
All LD1086V units undergo pre-shipment inspection (PSI). If there is an issue with LD1086V, 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 LD1086V part is unused and in its original packaging.
Return procedure for LD1086V:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LD1086V Tags
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