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STMicroelectronics LD1086DT25TR
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- Part No.:
- LD1086DT25TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LD1086DT25TR.pdf
- Description:
- IC REG LINEAR 2.5V 1.5A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,276
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Product details
Overview
LD1086DT25TR from STMicroelectronics is a fixed-output 2.5 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 to microcontroller cores, FPGA I/O banks, and industrial sensor signal chains where input-to-output headroom is constrained.
For engineers reviewing the LD1086DT25TR datasheet, LD1086DT25TR pinout, LD1086DT25TR application, or LD1086DT25TR equivalent, this page provides verified pin functions, real-world stability requirements (10 µF min. output capacitor), thermal resistance data (RthJA = 33 °C/W for DPAK), and validated alternatives for fixed 2.5 V LDO replacement in automotive, industrial, and embedded power rails.
Technical Context
The LD1086DT25TR integrates a precision bandgap reference (1.25 V nominal), error amplifier, and PNP pass transistor with current-limited base drive. Its fixed 2.5 V output is achieved via internal resistor divider trimming, eliminating external feedback components and reducing PCB footprint versus adjustable variants.
Unlike traditional PNP LDOs, its quiescent current flows into the load rather than being wasted-improving efficiency at light loads. Dropout behavior is monotonic down to 1.3 V at 1.5 A, with guaranteed performance across –40 °C to +125 °C junction temperature and input voltages up to 30 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±1% at 25 °C; ±2% over full –40 °C to +125 °C range - enables direct powering of 2.5 V logic without calibration. |
| Max Output Current | 1.5 A continuous - supports high-current digital loads like ARM Cortex-A series SoCs or multi-channel ADCs. |
| Dropout Voltage | 1.3 V typical at 1.5 A - allows operation with only 3.8 V input for 2.5 V output, critical in battery-powered systems. |
| Quiescent Current | 5–10 mA - flows into load, not ground, improving light-load efficiency vs. conventional PNP regulators. |
| Stability Requirement | 10 µF minimum ceramic or tantalum output capacitor - ensures loop stability without ESR constraints. |
| Thermal Resistance | RthJA = 33 °C/W (DPAK) - defines maximum power dissipation (≈2.7 W at 50 °C ambient) before thermal shutdown. |
| Input Voltage Range | 4.1 V to 30 V - accommodates wide-input industrial supplies and unregulated 5/12/24 V rails. |
Pinout & Package
LD1086DT25TR uses the DPAK (TO-252) surface-mount package with exposed thermal pad. The TAB is electrically connected to the OUTPUT pin, requiring appropriate copper pour for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input Supply | Accepts 4.1–30 V DC; requires local 10 µF input capacitor for transient immunity and PSRR improvement. |
| 2 (OUTPUT / TAB) | Regulated Output & Thermal Path | Delivers 2.5 V @ ≤1.5 A; metal tab must be soldered to ≥2 cm² copper area for RthJA = 33 °C/W performance. |
| 3 (GND) | Ground Reference | Low-impedance return path for load current and internal bias; must be routed separately from noisy digital GND. |
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-referred quiescent current | 5–10 mA flows into load instead of ground - increases light-load efficiency by up to 15% vs. standard PNP LDOs. |
| On-chip trimming | ±1% output tolerance at 25 °C - eliminates need for external calibration in precision analog or metrology applications. |
| Integrated protection | Thermal shutdown and current limiting active at all temperatures - prevents damage during overload or poor heatsinking. |
| Wide operating temperature | –40 °C to +125 °C junction range - qualified for under-hood automotive, factory automation, and outdoor industrial use. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Powering isolated 2.5 V analog front-ends and CAN transceiver logic in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 2.5 V supply for precision 16-bit ADCs and RS-485 PHYs, rejecting ripple from shared 24 V bus. Use Value: 1.3 V dropout enables operation during brownout conditions (e.g., 24 V bus sagging to 26.5 V); ±1% tolerance ensures ADC reference accuracy without trimming. |
Use Scenario: Regulating 2.5 V for microcontroller I/O banks and LIN transceivers in door module ECUs. IC Role / Device Role / Timing Role: Fixed-output LDO supplying noise-sensitive digital logic adjacent to high-current window motor drivers. Use Value: 88 dB PSRR at 120 Hz suppresses alternator ripple; –40 °C to +125 °C rating meets AEC-Q100 Grade 1 requirements. |
| Medical Patient Monitoring | Test & Measurement Equipment |
|
Use Scenario: Providing clean 2.5 V bias to ECG amplifier stages and SAR ADC references in portable monitors. IC Role / Device Role / Timing Role: Low-noise post-regulator after switching converter, minimizing RMS output noise (0.003% of VO). Use Value: 10 µF stability requirement allows use of small X7R ceramics; thermal regulation <0.04 %/W prevents drift during extended measurements. |
Use Scenario: Powering 2.5 V FPGA configuration banks and high-speed DACs in benchtop signal generators. IC Role / Device Role / Timing Role: Precision voltage source for reference voltage generation and clock buffer ICs. Use Value: ±2% full-temperature tolerance ensures timing margin compliance; 33 °C/W RthJA enables convection-cooled PCB layout without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV1117-25CDR | 2.5 V fixed, 800 mA max, 1.2 V dropout at 800 mA, RthJA = 60 °C/W (SOT-223) | Lower current capability; unsuitable for >1 A loads or high-ambient environments | Select when board space is constrained and load current remains ≤800 mA; verify thermal derating above 60 °C ambient. |
| NCP1117DT25RKG | 2.5 V fixed, 1 A max, 1.2 V dropout at 1 A, ±2% tolerance over temperature | Limited to 1 A; wider output tolerance reduces ADC reference accuracy in precision systems | Prefer for cost-sensitive consumer designs where 1 A suffices and ±2% tolerance is acceptable. |
Compared with TLV1117-25CDR and NCP1117DT25RKG, the LD1086DT25TR offers 50% higher current (1.5 A), tighter initial tolerance (±1% vs. ±2%), and superior thermal performance (33 °C/W vs. ≥60 °C/W), making it optimal for industrial and automotive applications demanding robustness and headroom.
Availability
LD1086DT25TR is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical patient monitors, and test equipment requiring stable component supply with long lifecycle assurance.
Supply support for LD1086DT25TR 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 silicon solutions for automotive, industrial, and power management applications.
The LD1086 series belongs to ST's high-current LDO portfolio, engineered specifically for industrial and automotive systems needing reliable, low-dropout regulation with minimal external components and extended temperature operation.
FAQ
What is the minimum input voltage required for LD1086DT25TR to regulate at 2.5 V?
The minimum input voltage is 3.8 V - calculated as 2.5 V output plus 1.3 V typical dropout at 1.5 A load. At lighter loads, dropout decreases (e.g., ~0.8 V at 500 mA), allowing lower input voltages. Operation below 3.8 V risks dropout and unregulated output.
Can LD1086DT25TR replace an adjustable LD1086 variant on the same PCB?
No - LD1086DT25TR has a 3-pin DPAK pinout (IN, OUTPUT, GND), while adjustable versions (e.g., LD1086D2M) use a 3-pin configuration with ADJ instead of GND. Pin compatibility exists only with other fixed-output variants in the same package; ADJ-pin devices require different routing and feedback components.
Is an input capacitor mandatory for stable operation?
Yes - ST recommends a minimum 10 µF aluminum or tantalum capacitor at the IN pin, placed within 10 mm of the device. This reduces input impedance, improves transient response, and enhances PSRR. Ceramic capacitors may be used if ≥10 µF and rated for ≥35 V.
Does LD1086DT25TR require a minimum load current to maintain regulation?
No - unlike older LDOs, the LD1086DT25TR maintains regulation with zero load current. Its architecture does not rely on minimum load for stability or reference biasing, simplifying design for intermittent or sleep-mode applications.
LD1086DT25TR 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:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.5V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 81dB (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
LD1086DT25TR FAQ
1.How can I place an order for LD1086DT25TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LD1086DT25TR 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 LD1086DT25TR reliable?
The price and inventory of LD1086DT25TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1086DT25TR is usually 5 days.
3.What payment methods are accepted for LD1086DT25TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1086DT25TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD1086DT25TR?
LD1086DT25TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD1086DT25TR 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 LD1086DT25TR?
For technical support, including LD1086DT25TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1086DT25TR requirements.
6.How does Aetrix verify that LD1086DT25TR is sourced from the original manufacturer or authorized distributors?
All LD1086DT25TR 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 LD1086DT25TR meets industry standards.
7.What is the process for return or replacement of LD1086DT25TR?
All LD1086DT25TR units undergo pre-shipment inspection (PSI). If there is an issue with LD1086DT25TR, 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 LD1086DT25TR part is unused and in its original packaging.
Return procedure for LD1086DT25TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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