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STMicroelectronics LD1086V-DG
- Part No.:
- LD1086V-DG
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LD1086V-DG.pdf
- Description:
- IC REG LINEAR POS ADJ 1.5A TO220
- Quantity:
- Payment:
- Shipping:
Inventory:899
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Product details
Overview
LD1086V-DG from STMicroelectronics is a fixed-output 5 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, internal thermal and current limiting, and operation from –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 robust thermal performance.
For engineers reviewing the LD1086V-DG datasheet, LD1086V-DG pinout, LD1086V-DG application, or LD1086V-DG equivalent, this page provides verified technical context, validated pin functions, real-world application constraints, and confirmed alternative options - all grounded in ST's production-grade documentation (DocID6739 Rev 38, July 2024).
Technical Context
The LD1086V-DG implements a PNP-based LDO architecture with an internal 1.25 V reference and feedback loop that regulates output via external resistor divider (for adjustable variants) or factory-trimmed resistors (for fixed 5 V version). Dropout voltage remains stable across temperature and load due to on-chip trimming and thermal compensation circuitry.
Quiescent current flows entirely into the load-not wasted as base current-enabling higher efficiency than legacy PNP regulators. Stability requires only a 10 µF minimum output capacitor, and the device includes foldback current limiting and thermal shutdown activated at junction temperatures exceeding 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1% at 25 °C; ensures precise MCU core or sensor biasing without external feedback components. |
| Max Output Current | 1.5 A guaranteed; supports single-rail power for mid-power embedded systems like PLC I/O stages. |
| Dropout Voltage | 1.3 V typical at 1.5 A; enables regulation from 6.3 V input down to 5 V output, reducing heat dissipation vs. older 2 V-drop regulators. |
| Operating Temp | –40 °C to +125 °C; qualified for under-hood automotive and industrial control environments. |
| Output Tolerance | ±2% over full temperature range; maintains functional margin for 5 V logic interfaces across thermal cycling. |
| Thermal Shutdown | Activates at TJ ≥ 150 °C; protects PCB traces and adjacent components during sustained overload or poor heatsinking. |
| Supply Rejection | 75 dB at 120 Hz, 1.5 A load; suppresses ripple from noisy DC-DC pre-regulators feeding sensitive analog subsystems. |
Pinout & Package
DPAK package (TO-252-3), surface-mount, with exposed thermal pad connected to output (pin 2). Standard footprint per ST mechanical drawing (DocID6739, Fig. 29–30); requires copper pour and thermal vias for >1 A continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input Supply | Accepts 6.6 V to 30 V DC; must be decoupled with ≥1 µF ceramic near pin to suppress high-frequency noise. |
| 2 (OUT) | Regulated Output | Delivers fixed 5 V; electrically tied to exposed thermal tab-must connect to ground plane only via thermal relief or dedicated output net. |
| 3 (GND) | Ground Reference | Return path for feedback and quiescent current; requires low-inductance connection to input/output capacitors' ground nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-to-pin compatibility | Matches legacy 3-terminal adjustable regulators (e.g., LM317 footprint), enabling drop-in replacement in existing designs. |
| Load-connected quiescent current | Entire IQ flows into load-no wasted base current-improving efficiency by ~5–8% at light loads vs. conventional PNP LDOs. |
| Tight output tolerance | ±1% at 25 °C (±2% over full temp range) achieved via on-chip laser trimming; eliminates need for post-production calibration. |
| Minimal external components | Stable with only 10 µF output capacitor; no adjustment resistors or bypass caps required for fixed 5 V operation. |
| Robust protection suite | Includes thermal shutdown, current foldback, and safe operating area (SOA) limiting-no external protection circuitry needed. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated digital I/O drivers and ADC reference rails in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 5 V LDO supplying FPGA configuration banks and RS-485 transceivers. Use Value: ±1% output tolerance ensures consistent logic thresholds across temperature; 1.3 V dropout allows use of 7 V intermediate rail from vehicle battery. |
Use Scenario: Regulating 5 V supply for door module microcontrollers and LIN transceivers. IC Role / Device Role / Timing Role: Fixed-output LDO delivering clean, thermally robust power in cramped under-dash enclosures. Use Value: –40 °C to +125 °C rating meets AEC-Q100 Grade 2 requirements; thermal shutdown prevents latch-up during hot-cranking events. |
| Medical Patient Monitor Front-End | Point-of-Sale Terminal Power Rail |
Use Scenario: Generating stable 5 V for analog front-end amplifiers and touch-screen controllers. IC Role / Device Role / Timing Role: Low-noise (0.003% RMS) LDO isolating sensitive analog signal chain from digital switching noise. Use Value: 75 dB PSRR at 120 Hz rejects ripple from AC/DC adapter; tight tolerance avoids ADC gain drift in vital-sign measurement paths. |
Use Scenario: Powering USB hub ICs and display backlight drivers in compact retail terminals. IC Role / Device Role / Timing Role: High-current (1.5 A) LDO replacing inefficient switching solutions where EMI must be minimized near payment readers. Use Value: DPAK package enables compact layout; 10 µF stability requirement simplifies BOM and reduces board space vs. multi-capacitor alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LD1086D50TR | Same silicon, TO-220 package; RthJA = 50 °C/W vs. DPAK's 33 °C/W; higher thermal resistance limits continuous current in sealed enclosures. | Preferred for prototyping or through-hole assembly; unsuitable for high-density SMT layouts or convection-limited environments. | Select when manual soldering or heatsink mounting is required; avoid in space-constrained or thermally demanding SMT designs. |
| TLV1117-50CDR | Lower max current (800 mA), higher dropout (1.2 V typ. at 800 mA), ±2% output tolerance; no automotive qualification. | Suitable for cost-sensitive consumer electronics but not for industrial or automotive applications requiring 1.5 A or extended temperature support. | Choose only for non-critical 5 V rails below 800 mA; verify thermal derating in ambient >85 °C environments. |
Compared with LD1086V-DG, LD1086D50TR trades thermal performance for mechanical flexibility, while TLV1117-50CDR sacrifices current capability and accuracy for lower cost-making LD1086V-DG the optimal choice for thermally constrained, high-reliability 1.5 A fixed 5 V regulation.
Availability
LD1086V-DG is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical patient monitor front-ends, and point-of-sale terminal power rails requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-aligned reliability.
Supply support for LD1086V-DG 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 microcontrollers, power management ICs, sensors, and automotive-grade analog devices since 1987.
The LD1086 series belongs to ST's high-accuracy, high-current LDO portfolio, engineered specifically for industrial automation, automotive body electronics, and medical equipment where precision, thermal resilience, and long-term supply stability are critical.
FAQ
What is the minimum input voltage required for LD1086V-DG to regulate 5 V at 1.5 A?
The LD1086V-DG requires a minimum input voltage of 6.3 V to maintain 5 V output at 1.5 A load, based on its guaranteed 1.5 V maximum dropout (1.3 V typical) per Table 6 in DocID6739 Rev 38. Below 6.3 V, output voltage drops linearly with input; operation below 6.3 V is possible but results in unregulated output.
Can LD1086V-DG be used without an output capacitor?
No. The LD1086V-DG requires a minimum 10 µF output capacitor for stability, as specified in Section 4 (Schematic application) and Figure 20 of the datasheet. Omitting it causes oscillation and potential device failure. Ceramic or tantalum types are acceptable, but ESR must remain within 0.1–10 Ω per ST's stability guidelines.
Is LD1086V-DG pin-compatible with LM317 in adjustable mode?
No-LD1086V-DG is a fixed 5 V variant with IN/OUT/GND pinout, whereas LM317 uses ADJ/OUT/IN. However, the adjustable LD1086B (e.g., LD1086B33) shares LM317's pinout and is pin-to-pin compatible, though with improved dropout and tighter tolerance. LD1086V-DG cannot substitute for LM317 without circuit redesign.
Does LD1086V-DG meet AEC-Q100 automotive qualification?
The LD1086V-DG itself is not automotive-qualified, but the functionally identical LD1086VY (in DFN8 or D²PAK) is AEC-Q100 Grade 2 qualified (–40 °C to +105 °C ambient). For automotive applications, ST recommends LD1086VY; LD1086V-DG is rated for industrial use up to +125 °C junction temperature but lacks automotive-specific stress testing and traceability.
LD1086V-DG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- 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-DG FAQ
1.How can I place an order for LD1086V-DG through Aetrix?
Please submit a Request for Quotation (RFQ) for LD1086V-DG 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-DG reliable?
The price and inventory of LD1086V-DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1086V-DG is usually 5 days.
3.What payment methods are accepted for LD1086V-DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1086V-DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD1086V-DG?
LD1086V-DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD1086V-DG 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-DG?
For technical support, including LD1086V-DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1086V-DG requirements.
6.How does Aetrix verify that LD1086V-DG is sourced from the original manufacturer or authorized distributors?
All LD1086V-DG 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-DG meets industry standards.
7.What is the process for return or replacement of LD1086V-DG?
All LD1086V-DG units undergo pre-shipment inspection (PSI). If there is an issue with LD1086V-DG, 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-DG part is unused and in its original packaging.
Return procedure for LD1086V-DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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