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onsemi NCP1086ST-ADJT3G
- Part No.:
- NCP1086ST-ADJT3G
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCP1086ST-ADJT3G.pdf
- Description:
- IC REG LIN POS ADJ 1.5A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:3,749
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Product details
Overview
NCP1086ST-ADJT3G from onsemi is an adjustable-output linear voltage regulator delivering up to 1.5 A with ±1% output accuracy over temperature, 1.05 V typical dropout at full load, fast transient response, and integrated overcurrent/thermal shutdown protection. It serves as a post-regulator or microprocessor supply in low-voltage, high-transient-demand systems.
For engineers reviewing the NCP1086ST-ADJT3G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 1.5 A, reference voltage stability (1.254 V typ), thermal regulation (0.002%/W), ripple rejection (80 dB at 120 Hz), and SOT-223 package thermal resistance (RJA = 156 °C/W).
Technical Context
The NCP1086ST-ADJT3G implements a composite PNP-NPN pass transistor architecture optimized for low-dropout operation and fast loop response. Its internal bandgap reference (1.254 V typ) and error amplifier enable precise output voltage setting via external resistive divider, with adjust pin current (50 µA typ) contributing measurable error in high-accuracy designs.
Thermal shutdown activates at 150–210 °C with 25 °C hysteresis, and current limiting engages at 1.6–3.1 A depending on junction temperature. The device requires a minimum load current of 0.6–2.0 mA and mandates tantalum or aluminum electrolytic output capacitance (≥22 µF) for stability-ceramic capacitors alone risk oscillation due to near-zero ESR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A maximum continuous - supports microprocessor core rails and FPGA I/O banks requiring stable high-current bias. |
| Dropout Voltage | 1.05 V typical @ 1.5 A - enables operation with ≤1.4 V VIN–VOUT margin, critical for 3.3 V or 2.5 V systems fed from 5 V rails. |
| Reference Voltage | 1.254 V typical (±1%) - sets base accuracy for adjustable outputs from 1.25 V to 5.5 V using R1/R2 divider. |
| Ripple Rejection | 80 dB @ 120 Hz - suppresses line-frequency noise from upstream switching supplies, preserving analog subsystem integrity. |
| Thermal Shutdown | 150–210 °C activation range - protects against sustained overload or inadequate heatsinking in enclosed industrial enclosures. |
| Quiescent Current | 5–10 mA - contributes directly to system standby power budget; lower than fixed-output variants (no GND pin bias path). |
| Adjust Pin Current | 50 µA typical - introduces voltage error in R2 that must be compensated when targeting <±0.5% output tolerance. |
Pinout & Package
SOT-223 package (Case 318E), 4-pin thermally enhanced surface-mount outline with exposed thermal pad connected to VOUT (pin 2). Tab is electrically tied to VOUT for direct PCB copper pour thermal coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj) | Adjust reference node | Low-side terminal of internal 1.25 V bandgap; connects to R2 in divider; 50 µA current flows here, affecting precision. |
| 2 (VOUT) | Regulated output | Power output and thermal tab connection; must be soldered to ≥1 cm² copper area for RJA = 156 °C/W performance. |
| 3 (VIN) | Unregulated input | Accepts 2.5–7.0 V input; differential >7.0 V risks destruction during short-circuit events despite thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Sub-10 µs recovery from 750 mA → 1500 mA load step - maintains <±120 mV deviation for CPU burst-mode operation. |
| Low dropout voltage | 1.05 V @ 1.5 A - reduces power loss by 1.6 W vs. 2.5 V dropout regulators, easing thermal design in space-constrained SOT-223 layout. |
| Integrated fault protection | Current limit (1.6–3.1 A) + thermal shutdown (150–210 °C) - eliminates need for external foldback or thermal sensors in cost-sensitive designs. |
| Pb-free SOT-223 package | RoHS-compliant ST suffix variant - meets IPC-J-STD-020 moisture sensitivity level 3 (MSL3) for standard reflow without baking. |
| Stable with low-ESR caps | Validated with 22 µF tantalum - avoids ceramic capacitor instability issues common in LDOs, simplifying BOM with widely available parts. |
Applications
| Microprocessor Core Supply | FPGA I/O Bank Regulation |
|---|---|
Use Scenario: Powering ARM Cortex-A series SoCs requiring 1.2–1.8 V at up to 1.5 A with tight voltage tolerance. IC Role / Device Role / Timing Role: Post-regulator stepping down intermediate 3.3 V rail to precise core voltage; provides low-noise, fast-transient bias independent of upstream DC/DC switching noise. Use Value: 80 dB ripple rejection attenuates 120 Hz artifacts from AC-DC front-ends, preventing digital logic metastability in clock domain crossings. | Use Scenario: Supplying 2.5 V or 3.3 V to Xilinx Artix-7 FPGA I/O banks with dynamic current draw up to 1.5 A. IC Role / Device Role / Timing Role: Local point-of-load regulator placed adjacent to FPGA package; delivers stable voltage during simultaneous I/O switching events. Use Value: 1.05 V dropout enables use of 5 V intermediate bus, reducing required input capacitance and PCB footprint vs. higher-dropout alternatives. |
| Industrial Sensor Signal Chain | Medical Diagnostic Front-End |
Use Scenario: Biasing precision ADC drivers and op-amps in 4–20 mA loop-powered transmitters operating at −40 °C to +70 °C. IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from digital sections; maintains ±1% output accuracy across full industrial temperature range. Use Value: 0.002%/W thermal regulation minimizes drift during ambient temperature cycling, preserving 16-bit measurement linearity. | Use Scenario: Powering ultrasound receive-path amplifiers and anti-aliasing filters where EMI immunity and voltage stability are safety-critical. IC Role / Device Role / Timing Role: Clean analog supply isolated from noisy digital domains; thermal shutdown prevents thermal runaway during extended diagnostic imaging sessions. Use Value: Integrated overcurrent and thermal protection eliminate need for redundant external monitoring, reducing component count in Class II medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1086CM-ADJ | Pin-compatible but higher 1.5 V typical dropout @ 1.5 A; ±1.5% reference accuracy; no Pb-free SOT-223 option. | Same adjustable topology but less suitable for ultra-low-VIN applications; requires larger heatsink due to higher power dissipation. | Select LT1086CM-ADJ only if legacy design reuse or dual-sourcing with existing LT1086 footprint is mandatory. |
| TLV1117-ADJ | Lower 1.2 A max output; 1.2 V dropout @ 800 mA; 1.25 V reference (±2%); SOT-223 Pb-free available. | Insufficient for 1.5 A loads; acceptable only for <1 A sensor or interface rails where size and cost outweigh current needs. | Choose TLV1117-ADJ for cost-sensitive, sub-1 A applications where 1.2 V dropout suffices and thermal budget allows RJA = 190 °C/W. |
Compared with LT1086CM-ADJ and TLV1117-ADJ, the NCP1086ST-ADJT3G delivers 0.45 V lower dropout at full load and tighter reference accuracy, enabling higher efficiency and better regulation in thermally constrained SOT-223 layouts-critical for modern embedded systems scaling to 1.5 A analog/digital hybrid rails.
Availability
NCP1086ST-ADJT3G is available at Aetrix Electronics and suitable for microprocessor core supplies, FPGA I/O regulation, industrial sensor signal chains, and medical diagnostic front-ends requiring stable component supply with RoHS compliance and MSL3 reflow capability.
Supply support for NCP1086ST-ADJT3G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The NCP1086 series was designed specifically for high-current, low-dropout post-regulation in space-constrained embedded systems-emphasizing thermal robustness, transient performance, and compatibility with legacy LT1086 footprints while improving efficiency.
FAQ
What is the maximum input voltage for the NCP1086ST-ADJT3G?
The NCP1086ST-ADJT3G has an absolute maximum input-to-output voltage differential of 7.0 V. Exceeding this differential-even momentarily during startup or short-circuit conditions-can destroy the pass transistor before thermal or current protection activates. For reliable operation, maintain VIN ≤ VOUT + 7.0 V under all conditions, including transients.
How do I calculate the output voltage for the NCP1086ST-ADJT3G in adjustable mode?
The NCP1086ST-ADJT3G output voltage is set by VOUT = 1.25 V × (1 + R1/R2) + (IAdj × R2), where IAdj = 50 µA typical. To minimize error, select R1 so that current through R1 exceeds 2 mA, and use matched metal-film resistors. For example, R1 = 1.2 kΩ and R2 = 1.0 kΩ yields ~2.45 V nominal, with ~50 mV adjustment error.
Does the NCP1086ST-ADJT3G require an external diode for reverse-voltage protection?
No, the NCP1086ST-ADJT3G does not integrate reverse-voltage protection, and its internal structure lacks inherent blocking. If VIN can fall below VOUT (e.g., during hot-swap or backup battery switchover), an external Schottky diode (anode to VIN, cathode to VOUT) is required to prevent reverse current flow and potential damage to the pass transistor.
What is the minimum load current required for regulation with the NCP1086ST-ADJT3G?
The NCP1086ST-ADJT3G requires a minimum load current of 0.6–2.0 mA to maintain regulation, primarily to bias the internal reference and error amplifier. This is typically satisfied by the current drawn through the R1–R2 feedback divider; R1 should be selected so its current exceeds 2.0 mA at minimum VOUT to ensure stability across temperature and line variations.
Can the NCP1086ST-ADJT3G be used without a heatsink in a 1.5 A application?
In a 1.5 A application with 5 V input and 3.3 V output, the NCP1086ST-ADJT3G dissipates (5 − 3.3) × 1.5 = 2.55 W. With RJA = 156 °C/W for SOT-223 on standard FR4, junction temperature rise would exceed 398 °C-far above the 150 °C limit. A heatsink or large copper pour (>4 cm²) is mandatory; thermal compound and isolation hardware are recommended for safe operation.
NCP1086ST-ADJT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 1.4V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 80dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223 (TO-261)
NCP1086ST-ADJT3G FAQ
1.How can I place an order for NCP1086ST-ADJT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1086ST-ADJT3G 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 NCP1086ST-ADJT3G reliable?
The price and inventory of NCP1086ST-ADJT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1086ST-ADJT3G is usually 5 days.
3.What payment methods are accepted for NCP1086ST-ADJT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1086ST-ADJT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1086ST-ADJT3G?
NCP1086ST-ADJT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1086ST-ADJT3G 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 NCP1086ST-ADJT3G?
For technical support, including NCP1086ST-ADJT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1086ST-ADJT3G requirements.
6.How does Aetrix verify that NCP1086ST-ADJT3G is sourced from the original manufacturer or authorized distributors?
All NCP1086ST-ADJT3G 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 NCP1086ST-ADJT3G meets industry standards.
7.What is the process for return or replacement of NCP1086ST-ADJT3G?
All NCP1086ST-ADJT3G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1086ST-ADJT3G, 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 NCP1086ST-ADJT3G part is unused and in its original packaging.
Return procedure for NCP1086ST-ADJT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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