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onsemi NCP1086ST-ADJT3
- Part No.:
- NCP1086ST-ADJT3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCP1086ST-ADJT3.pdf
- Description:
- IC REG LIN POS ADJ 1.5A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:4,416
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Product details
Overview
NCP1086ST-ADJT3 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, and fast transient response. It operates from 1.25 V to 5.5 V output range using two external resistors and is designed for post-regulation in microprocessor power supplies where low-voltage operation and dynamic load stability are critical.
For engineers reviewing the NCP1086ST-ADJT3 datasheet, pinout, applications, or equivalent options, key selection considerations include dropout voltage at 1.5 A, thermal shutdown threshold (150–210°C), reference voltage tolerance (±1%), minimum load current requirement (0.6–2.0 mA), and SOT-223 package thermal resistance (RJA = 156°C/W).
Technical Context
The NCP1086ST-ADJT3 implements a composite PNP-NPN pass transistor architecture enabling low dropout and high current capability. Its error amplifier maintains a precise 1.254 V (typ) reference between VOUT and ADJ pins, with adjust pin current of 50 µA (typ) that must be accounted for in resistor divider design.
Internal protection includes foldback current limiting (1.6–3.1 A) and thermal shutdown with 25°C hysteresis. The device requires a minimum 10 µF input and 22 µF tantalum output capacitor for stability, and its loop response supports rapid load transients common in digital IC supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A maximum - supports microprocessor core or I/O rail loads without external boost circuitry. |
| Reference Voltage | 1.254 V (typ), ±1% - sets baseline for accurate adjustable output via external R1/R2 divider. |
| Dropout Voltage | 1.05 V (typ) at 1.5 A - enables regulation from 4.3 V input when generating 3.3 V output. |
| Line Regulation | 0.02% (typ) - ensures stable output despite ±10% input variation under light load. |
| Load Regulation | 0.04% (typ) - maintains tight output voltage across full 10 mA to 1.5 A load range. |
| Ripple Rejection | 80 dB at 120 Hz - suppresses AC ripple from upstream switching converters feeding the LDO. |
| Thermal Shutdown | 150–210°C activation range - protects against sustained overload or inadequate heatsinking. |
Pinout & Package
SOT-223 package (Case 318E), surface-mount, thermally enhanced with tab connected to VOUT. Pin 1 = Adj, Pin 2 = VOUT, Pin 3 = VIN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj) | Adjust reference node | Low-side connection to internal 1.254 V bandgap; current (50 µA typ) flows through R2 in divider, introducing small output error. |
| 2 (VOUT) | Regulated output | Power output terminal and thermal tab - must be soldered to PCB copper pour for thermal management. |
| 3 (VIN) | Input supply | Unregulated DC input; absolute max differential to VOUT is 7.0 V - limits usable input headroom. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Sub-10 µs recovery from 750 mA load step - minimizes undershoot/overshoot on CPU power rails. |
| Low dropout voltage | 1.05 V typ at 1.5 A - enables efficient 3.3 V generation from 4.5 V intermediate bus. |
| Integrated protection | Current limit + thermal shutdown - eliminates need for external fault-handling circuitry in most designs. |
| Pb-free packaging | RoHS-compliant SOT-223 (ST suffix) - meets environmental compliance requirements for industrial and telecom equipment. |
| Stable with standard capacitors | Compatible with 22 µF tantalum output cap - avoids instability risks associated with low-ESR ceramic-only solutions. |
Applications
| Microprocessor Core Supply | FPGA I/O Bank Regulator |
|---|---|
Use Scenario: Providing clean, low-noise 1.8 V or 2.5 V supply to ARM Cortex-A series processors during burst-mode execution. IC Role / Device Role / Timing Role: Post-regulator stepping down from 5 V or 3.3 V intermediate rail; delivers stable voltage during rapid 0–1.5 A load transitions. Use Value: 1.05 V dropout and fast transient response prevent brownout during instruction fetch bursts, ensuring deterministic timing. |
Use Scenario: Powering configurable FPGA I/O banks requiring user-selectable 1.5 V, 1.8 V, or 2.5 V outputs. IC Role / Device Role / Timing Role: Adjustable LDO supplying programmable I/O voltage; configured via external resistor divider per bank. Use Value: ±1% reference accuracy and 0.04% load regulation maintain signal integrity margins across process/voltage/temperature corners. |
| Industrial PLC Digital I/O Module | Medical Diagnostic Sensor Interface |
Use Scenario: Regulating 3.3 V for isolated digital logic and communication interfaces (RS-485, CAN) in programmable logic controllers. IC Role / Device Role / Timing Role: Fixed or adjustable local supply for noise-sensitive interface ICs; placed near connector to minimize trace inductance. Use Value: 80 dB ripple rejection attenuates switching noise from adjacent DC-DC converters, preventing data corruption on serial buses. |
Use Scenario: Powering precision analog front-end (AFE) circuits in portable ultrasound or ECG devices requiring ultra-low-noise bias. IC Role / Device Role / Timing Role: Low-dropout source for op-amp rails and ADC reference buffers; operated below thermal shutdown threshold with minimal heatsink. Use Value: Thermal regulation of 0.002%/W ensures <10 µV drift under varying ambient conditions, preserving measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1086CM-ADJ | Pin-compatible but higher 1.3 V typical dropout at 1.5 A; no Pb-free option in through-hole TO-220 only. | Same functional role but less suitable for space-constrained SMT designs due to package limitation. | Select LT1086CM-ADJ only if legacy board reuse or through-hole assembly is required; verify thermal margin with RJA = 50°C/W. |
| TPS7A4700RGWR | Lower 0.3 V dropout at 1 A, but rated only to 1 A; 20 µVRMS noise vs. unspecified noise for NCP1086ST-ADJT3. | Better for ultra-low-noise analog rails, but insufficient current for 1.5 A digital loads. | Choose TPS7A4700RGWR for precision analog subsystems; retain NCP1086ST-ADJT3 for high-current digital regulation. |
Compared with LT1086CM-ADJ and TPS7A4700RGWR, the NCP1086ST-ADJT3 uniquely balances 1.5 A capability, SOT-223 surface-mount compatibility, and 1.05 V dropout - making it optimal for cost-sensitive, thermally constrained digital power rails where both current and layout density matter.
Availability
NCP1086ST-ADJT3 is available at Aetrix Electronics and suitable for microprocessor core supplies, FPGA I/O regulation, and industrial digital I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for NCP1086ST-ADJT3 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 silicon solutions for automotive, industrial, cloud, and medical applications.
The NCP1086ST-ADJT3 belongs to onsemi's high-current linear regulator product line, engineered specifically for post-regulation in digital systems where low dropout, fast transient response, and integrated fault protection reduce system-level design complexity.
FAQ
What output voltage range does the NCP1086ST-ADJT3 support?
The NCP1086ST-ADJT3 supports an adjustable output voltage range of 1.25 V to 5.5 V, set by an external resistor divider between the ADJ and VOUT pins. Its internal 1.254 V reference voltage (±1%) establishes the lower bound, and the upper limit is constrained by the 7.0 V maximum VIN–VOUT differential rating. This makes the NCP1086ST-ADJT3 suitable for generating common logic rails including 1.8 V, 2.5 V, 3.3 V, and 5.0 V.
How does the NCP1086ST-ADJT3 handle thermal overload?
The NCP1086ST-ADJT3 incorporates fully tested thermal shutdown circuitry activating between 150°C and 210°C junction temperature, with 25°C hysteresis to prevent oscillation. When triggered, the device disables the pass transistor until temperature falls below the hysteresis threshold. For reliable operation, the SOT-223 package requires adequate PCB copper area (≥4 cm²) due to its RJA of 156°C/W - a heatsink is recommended above ~0.5 W dissipation.
Can the NCP1086ST-ADJT3 replace fixed-output regulators like the NCP1086ST-33T3?
No - the NCP1086ST-ADJT3 is strictly an adjustable-output variant with ADJ, VOUT, and VIN pins, while the NCP1086ST-33T3 is a fixed 3.3 V version with GND, VOUT, and VIN pins. Their pinouts differ: Pin 1 is ADJ (not GND), so direct substitution would short the adjust node to ground and disable regulation. To use the NCP1086ST-ADJT3 as a 3.3 V source, configure R1 = 1.21 kΩ and R2 = 2.05 kΩ per the datasheet formula, ensuring minimum load current ≥0.6 mA.
What capacitor values are required for stable operation of the NCP1086ST-ADJT3?
The NCP1086ST-ADJT3 requires a minimum 10 µF input capacitor (CIN) and 22 µF tantalum output capacitor (COUT) for guaranteed stability, as validated in the datasheet test conditions. Aluminum electrolytic or tantalum types are preferred due to their ESR; ceramic-only solutions risk oscillation. For improved transient response in microprocessor applications, parallel combinations (e.g., 22 µF tantalum + 1 µF ceramic) placed close to the VOUT and GND pins are recommended.
Is the NCP1086ST-ADJT3 pin-compatible with other LDO families?
Yes - the NCP1086ST-ADJT3 is explicitly documented as pin-compatible with the LT1086 family of adjustable LDOs in SOT-223 package, sharing identical ADJ/VOUT/VIN pinout and function. However, it delivers lower dropout (1.05 V vs. 1.3 V typical) and supports Pb-free RoHS compliance, distinguishing it from legacy LT1086 variants. Always verify thermal performance and reference voltage tolerance when substituting.
NCP1086ST-ADJT3 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-ADJT3 FAQ
1.How can I place an order for NCP1086ST-ADJT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1086ST-ADJT3 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-ADJT3 reliable?
The price and inventory of NCP1086ST-ADJT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1086ST-ADJT3 is usually 5 days.
3.What payment methods are accepted for NCP1086ST-ADJT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1086ST-ADJT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1086ST-ADJT3?
NCP1086ST-ADJT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1086ST-ADJT3 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-ADJT3?
For technical support, including NCP1086ST-ADJT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1086ST-ADJT3 requirements.
6.How does Aetrix verify that NCP1086ST-ADJT3 is sourced from the original manufacturer or authorized distributors?
All NCP1086ST-ADJT3 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-ADJT3 meets industry standards.
7.What is the process for return or replacement of NCP1086ST-ADJT3?
All NCP1086ST-ADJT3 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1086ST-ADJT3, 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-ADJT3 part is unused and in its original packaging.
Return procedure for NCP1086ST-ADJT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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