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onsemi NCP1086T-ADJ
- Part No.:
- NCP1086T-ADJ
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
NCP1086T-ADJ.pdf
- Description:
- IC REG LIN POS ADJ 1.5A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,011
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Product details
Overview
NCP1086T-ADJ from onsemi is a 1.5 A adjustable-output linear voltage regulator in TO-220-3 package, delivering 1.25 V to 5.5 V output via external resistor divider, with typical dropout voltage of 1.05 V at full load and ±1% output accuracy over temperature - used as post-regulator for microprocessor power supplies requiring fast transient response and low-voltage operation.
For engineers reviewing the NCP1086T-ADJ datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 1.5 A, thermal shutdown threshold (150–210°C), reference voltage stability (1.241–1.266 V), load regulation (≤0.4%), and compatibility with tantalum output capacitors for stability in high-current embedded systems.
Technical Context
The NCP1086T-ADJ implements a composite PNP-NPN pass transistor architecture enabling low dropout and fast loop response. Its internal bandgap reference (1.254 V typ) and error amplifier regulate output by comparing voltage across an external R1/R2 divider connected to the Adj pin.
Thermal shutdown activates at junction temperatures between 150°C and 210°C with 25°C hysteresis, and current limiting engages at 1.6–3.1 A depending on input-output differential. The device requires ≥22 µF tantalum output capacitance for stable operation and exhibits 80 dB ripple rejection at 120 Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A maximum continuous - supports microprocessor core or I/O rail loads without derating at moderate ambient temperatures with appropriate heatsinking. |
| Output Voltage Range | 1.25 V to 5.5 V adjustable - set precisely using two external resistors; minimum load current requirement (0.6–2.0 mA) must be met via R1 selection. |
| Dropout Voltage | 1.05 V typical @ 1.5 A - enables operation with only 1.05 V headroom above output, critical for low-voltage systems like 3.3 V or 2.5 V rails. |
| Reference Voltage | 1.254 V typical (1.241–1.266 V range) - defines baseline for output setting; adjust pin current (50–100 µA) introduces small but correctable error in precision designs. |
| Thermal Shutdown | 150–210°C activation range with 25°C hysteresis - protects against sustained overload or inadequate heatsinking; 100% functionally tested in production. |
| Ripple Rejection | 80 dB @ 120 Hz - suppresses AC line noise and switching supply ripple upstream, reducing need for additional filtering in post-regulation stages. |
| Line Regulation | 0.02% typical - ensures output stability despite ±10% input variation, suitable for unregulated DC bus inputs. |
Pinout & Package
Package: TO-220-3 (Case 221A), tab electrically connected to VOUT; requires thermal compound and mechanical isolation if VOUT is not ground-referenced.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Adj | Adjust reference node | Low-side terminal of internal 1.25 V bandgap reference; connects to junction of external R1/R2 divider; 50–100 µA current flows here, affecting precision. |
| 2 - VOUT | Regulated output | Main power output terminal; also connected to metal tab for thermal conduction; must be routed with low-impedance path to load. |
| 3 - VIN | Input supply | Unregulated DC input; absolute max VIN–VOUT = 7.0 V - exceeding this risks destruction before protection circuits activate. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Sub-microsecond regulation recovery enables stable operation under dynamic CPU load changes without output droop or overshoot. |
| Low dropout voltage | 1.05 V typical @ 1.5 A allows use with minimal input headroom - extends battery life in portable 3.3 V systems and reduces heat generation. |
| ±1% output accuracy | Maintained over −40°C to +70°C ambient - ensures reliable logic-level compliance for FPGA, ASIC, and microcontroller power domains. |
| Integrated protection | Current limit (1.6–3.1 A) and thermal shutdown (150–210°C) prevent catastrophic failure during fault conditions without external circuitry. |
| Pb-free packaging | RoHS-compliant TO-220-3 variant (NCP1086T-ADJG) available - meets environmental requirements for industrial and consumer manufacturing. |
Applications
| Microprocessor Core Supply | FPGA I/O Bank Regulation |
|---|---|
Use Scenario: Providing clean, low-noise 1.5 A power to ARM Cortex-A series processor cores operating at 1.2–1.8 V. IC Role / Device Role / Timing Role: Post-regulator stepping down intermediate 5 V or 3.3 V rail to precise core voltage with fast load-step response. Use Value: 1.05 V dropout enables efficient conversion from 3.3 V input to 1.8 V output; 80 dB ripple rejection minimizes digital noise coupling into sensitive analog sections. |
Use Scenario: Delivering stable 2.5 V or 3.3 V to FPGA I/O banks with rapidly varying current demand during configuration and data transfer. IC Role / Device Role / Timing Role: Local point-of-load regulator placed near FPGA package to minimize PCB trace impedance effects. Use Value: ±1% output accuracy ensures signal integrity across LVCMOS/LVDS interfaces; fast transient response prevents setup/hold violations during burst-mode transfers. |
| Industrial PLC Power Module | Medical Diagnostic Sensor Interface |
Use Scenario: Generating isolated 5.0 V or adjustable 3.3 V supply for programmable logic controller (PLC) digital I/O modules in harsh 24 V DC environments. IC Role / Device Role / Timing Role: Secondary regulator after DC-DC converter, providing EMI-robust, thermally resilient local power. Use Value: Thermal shutdown hysteresis (25°C) prevents cycling during intermittent overloads; TO-220 package allows bolt-on heatsinking for continuous 1.5 A operation at 70°C ambient. |
Use Scenario: Powering low-noise analog front-end (AFE) circuits in portable ultrasound or ECG devices requiring ultra-stable 3.3 V bias. IC Role / Device Role / Timing Role: Low-ripple, low-drift voltage source for precision ADC references and op-amp rails. Use Value: 0.02% line regulation and <0.4% load regulation preserve measurement accuracy; 1.254 V reference stability supports calibrated sensor offset compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1086CT-ADJ | Pin-compatible but higher typical dropout (1.3 V @ 1.5 A); ±1.5% reference tolerance vs. NCP1086T-ADJ's ±1%. | Less suitable for ultra-low-headroom designs; same TO-220 footprint allows direct board reuse if thermal margin permits. | Select when legacy LT1086 design migration is required and 0.25 V higher dropout is acceptable. |
| TLV1117-ADJ | Lower current rating (800 mA), lower dropout (1.2 V typ @ 800 mA), SOT-223 only - no TO-220 option. | Not viable for 1.5 A loads; limited thermal performance without heatsink; unsuitable for high-power industrial use cases. | Consider only for space-constrained, sub-1 A applications where TO-220 mounting is impractical. |
Compared with LT1086CT-ADJ and TLV1117-ADJ, the NCP1086T-ADJ delivers superior current capability and tighter reference accuracy in a thermally robust TO-220 package, making it optimal for 1.5 A embedded power rails where dropout voltage and thermal reliability are critical.
Availability
NCP1086T-ADJ is available at Aetrix Electronics and suitable for microprocessor core supplies, FPGA I/O regulation, industrial PLC modules, and medical sensor interface circuits requiring stable component supply with long-term manufacturability and RoHS-compliant variants.
Supply support for NCP1086T-ADJ 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, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The NCP1086T-ADJ belongs to onsemi's high-current linear regulator product line, engineered specifically for post-regulation in microprocessor and FPGA power systems where low dropout, fast transient response, and thermal resilience are mandatory.
FAQ
What is the maximum input-to-output voltage differential allowed for NCP1086T-ADJ?
The absolute maximum VIN–VOUT differential for NCP1086T-ADJ is 7.0 V. Exceeding this risks immediate device failure during short-circuit events before overcurrent or thermal shutdown can react. This limit applies regardless of output voltage setting and must be enforced by external clamping circuitry in high-input-voltage applications.
Can NCP1086T-ADJ be used without a heatsink at 1.5 A output current?
No - NCP1086T-ADJ requires a heatsink at 1.5 A. With RJA ≈ 50°C/W and typical dropout of 1.05 V, power dissipation reaches ~1.6 W, raising junction temperature >100°C above ambient even at 25°C. Use thermal compound and a minimum 3.5°C/W heatsink to maintain TJ ≤ 150°C per datasheet limits.
What output capacitor type and value are recommended for stable operation of NCP1086T-ADJ?
A minimum 22 µF tantalum capacitor is required at the output of NCP1086T-ADJ for stability. Aluminum electrolytic or polymer capacitors may also be used, but ceramic capacitors alone are discouraged due to near-zero ESR causing potential oscillation. For improved transient response, parallel 22 µF tantalum with 1–10 µF ceramic is common practice.
How does the adjust pin current affect output voltage accuracy in NCP1086T-ADJ designs?
The NCP1086T-ADJ adjust pin draws 50–100 µA, flowing through R2 in the feedback divider. This adds an error term (IAdj × R2) to the ideal VOUT = 1.25 × (1 + R1/R2) equation. To minimize impact, keep R2 ≤ 10 kΩ and use matched metal-film resistors; precision applications may require iterative calculation or trimming.
Is NCP1086T-ADJ pin-compatible with other regulators in the same family?
Yes - NCP1086T-ADJ is pin-compatible with the LT1086 family in TO-220-3 package (pin 1 = Adj, pin 2 = VOUT, pin 3 = VIN). However, differences in dropout voltage, reference accuracy, and thermal shutdown thresholds mean electrical behavior is not identical; validation in the target application is required before substitution.
NCP1086T-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-3
NCP1086T-ADJ FAQ
1.How can I place an order for NCP1086T-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1086T-ADJ 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 NCP1086T-ADJ reliable?
The price and inventory of NCP1086T-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1086T-ADJ is usually 5 days.
3.What payment methods are accepted for NCP1086T-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1086T-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1086T-ADJ?
NCP1086T-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1086T-ADJ 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 NCP1086T-ADJ?
For technical support, including NCP1086T-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1086T-ADJ requirements.
6.How does Aetrix verify that NCP1086T-ADJ is sourced from the original manufacturer or authorized distributors?
All NCP1086T-ADJ 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 NCP1086T-ADJ meets industry standards.
7.What is the process for return or replacement of NCP1086T-ADJ?
All NCP1086T-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with NCP1086T-ADJ, 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 NCP1086T-ADJ part is unused and in its original packaging.
Return procedure for NCP1086T-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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