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onsemi NCP1086D2T-33R4
- Part No.:
- NCP1086D2T-33R4
- Manufacturer:
- onsemi
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
NCP1086D2T-33R4.pdf
- Description:
- IC REG LINEAR 3.3V 1.5A D2PAK-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,119
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Product details
Overview
NCP1086D2T-33R4 from onsemi is a 3.3 V fixed-output, 1.5 A linear regulator in D2PAK-3 package, featuring 1.05 V typical dropout voltage at full load, ±1.5% output voltage accuracy over temperature, and integrated thermal shutdown and current limit protection. It serves as a post-regulator for microprocessor power supplies where low-voltage operation and fast transient response are critical.
For engineers reviewing the NCP1086D2T-33R4 datasheet, pinout, applications, or equivalent options, key selection considerations include dropout voltage at 1.5 A, thermal regulation performance (0.002%/W), ripple rejection (80 dB at 120 Hz), and compatibility with tantalum output capacitors for stability in high-current load scenarios.
Technical Context
The NCP1086D2T-33R4 implements a composite PNP-NPN pass transistor architecture optimized for low dropout and fast loop response. Its internal bandgap reference and error amplifier maintain regulation across input differentials from 2.0 V to 3.7 V while delivering up to 1.5 A.
Thermal shutdown activates at 150–210°C with 25°C hysteresis, and current limiting operates at 1.6–3.1 A depending on junction temperature. The device requires no external feedback components due to its fixed 3.3 V output configuration and uses GND–VOUT–VIN pinout in D2PAK-3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±1.5% - ensures stable core voltage for 3.3 V logic and microprocessors under varying load and temperature. |
| Max Output Current | 1.5 A - supports high-current digital loads including FPGA I/O banks and ASIC subsystems. |
| Dropout Voltage | 1.05 V (typ) @ 1.5 A - enables operation from 4.35 V input when regulating 3.3 V, minimizing power loss and heat generation. |
| Ripple Rejection | 80 dB @ 120 Hz - suppresses line-frequency noise from upstream switching regulators in hybrid power architectures. |
| Thermal Shutdown | 150–210°C activation range - protects against sustained overload or inadequate heatsinking in enclosed industrial environments. |
| Quiescent Current | 5.0–10 mA - maintains low standby power in always-on subsystems without compromising regulation speed. |
| Line Regulation | 0.02% (typ) - limits output variation to <0.7 mV across 2.0–3.7 V input differential, critical for precision analog interfaces. |
Pinout & Package
D2PAK-3 package with exposed thermal pad (case = VOUT); TO-220-3 and SOT-223 variants share identical pin function mapping but differ in thermal resistance (RJC = 3.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal error amplifier and thermal shutdown comparator; must be low-impedance connection to minimize load regulation error. |
| 2 | VOUT | Regulated 3.3 V output; case-connected for direct thermal coupling to heatsink; requires Kelvin sensing layout for best accuracy. |
| 3 | VIN | Input supply (max 7.0 V differential vs. VOUT); must be decoupled with ≥10 µF tantalum capacitor close to pin to ensure stability. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Sub-10 µs recovery from 750 mA → 1500 mA load step with <120 mV deviation - sustains microprocessor voltage during burst-mode execution. |
| Low thermal regulation drift | 0.002%/W - limits output voltage shift to <6.6 µV per watt of dissipated power, enabling predictable margining in thermal cycling environments. |
| Integrated fault protection | Current limit + thermal shutdown - eliminates need for external foldback circuitry in space-constrained embedded systems. |
| Pb-free packaging | D2PAK-3 with RoHS-compliant finish - meets IPC-J-STD-020 moisture sensitivity level 3 and reflow profile compatibility for automated assembly. |
| Stable with standard tantalum caps | Validated with 22 µF tantalum output capacitor - avoids ceramic capacitor instability risks while reducing BOM count and cost. |
Applications
| Microprocessor Core Supply | FPGA I/O Bank Regulator |
|---|---|
Use Scenario: Powering ARM Cortex-A series SoCs requiring tightly regulated 3.3 V I/O rails with rapid load transients during DDR interface activity. IC Role / Device Role / Timing Role: Primary post-regulator converting intermediate 5 V DC/DC output to clean 3.3 V, handling >1 A peak currents with <10 µs response. Use Value: 1.05 V dropout enables use of lower-input-voltage upstream converters, reducing system power loss by up to 18% versus higher-dropout alternatives. | Use Scenario: Supplying configurable I/O banks on Xilinx Artix-7 FPGAs where rail stability directly impacts signal integrity and timing closure. IC Role / Device Role / Timing Role: Fixed-output LDO providing low-noise 3.3 V to multiple I/O banks simultaneously, rejecting ripple from shared 12 V input bus. Use Value: 80 dB ripple rejection at 120 Hz prevents switching noise from degrading setup/hold margins on high-speed LVCMOS interfaces. |
| Industrial PLC Digital I/O Module | Medical Diagnostic Sensor Interface |
Use Scenario: Regulating 3.3 V for isolated digital input/output circuits in DIN-rail mounted programmable logic controllers operating at 70°C ambient. IC Role / Device Role / Timing Role: Load-independent voltage source maintaining regulation across 10 mA–1.5 A load range while surviving 150°C junction temperatures. Use Value: Thermal shutdown hysteresis of 25°C prevents oscillation during thermal stress, ensuring deterministic fail-safe behavior in unventilated enclosures. | Use Scenario: Powering precision analog front-end sensors (e.g., EEG amplifiers) requiring ultra-low-noise 3.3 V bias with minimal thermal drift. IC Role / Device Role / Timing Role: Low-drift LDO supplying sensor excitation and ADC reference circuitry, leveraging 0.002%/W thermal regulation for <0.1% gain error over operating range. Use Value: ±1.5% output accuracy over −40°C to +70°C eliminates need for system-level calibration in portable diagnostic devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1086CT-3.3#PBF | Pin-compatible but higher 1.3 V typical dropout at 1.5 A; 1.5x higher thermal resistance (RJA = 65°C/W vs. 10–50°C/W for NCP1086D2T-33R4 on PCB). | Less suitable for high-ambient-temperature industrial designs requiring minimal heatsink area. | Select when legacy LT1086 footprint reuse is mandatory and thermal headroom exceeds 25°C. |
| TPS7A4701RGWR | Lower 0.3 V dropout but rated only for 1 A; 20 µVRMS noise vs. unspecified for NCP1086D2T-33R4; requires external compensation. | Better for ultra-low-noise analog rails but cannot support 1.5 A FPGA I/O loads without derating. | Select for mixed-signal precision applications where noise dominates over current capability. |
Compared with LT1086CT-3.3#PBF and TPS7A4701RGWR, the NCP1086D2T-33R4 delivers superior thermal performance in D2PAK-3 for 1.5 A continuous loads, balances dropout voltage and cost-effectiveness for industrial microprocessor supplies, and eliminates external compensation complexity-making it optimal for cost-sensitive, thermally constrained embedded systems.
Availability
NCP1086D2T-33R4 is available at Aetrix Electronics and suitable for microprocessor core supplies, FPGA I/O regulation, industrial PLC modules, and medical sensor interfaces requiring stable component supply across long production lifecycles.
Supply support for NCP1086D2T-33R4 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 manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The NCP1086 series was designed specifically for high-current post-regulation in microprocessor and FPGA power delivery networks, emphasizing low dropout, fast transient response, and robust thermal protection in surface-mount packages.
FAQ
What is the maximum input voltage allowed for NCP1086D2T-33R4?
The NCP1086D2T-33R4 has an absolute maximum supply voltage rating of 7.0 V differential between VIN and VOUT. Since its output is fixed at 3.3 V, the maximum allowable VIN is 10.3 V. However, recommended operation limits VIN to ≤7.0 V above VOUT (i.e., ≤10.3 V) to ensure reliability; exceeding this risks permanent damage even if thermal shutdown activates.
Does NCP1086D2T-33R4 require an external capacitor for stability?
Yes, the NCP1086D2T-33R4 requires a minimum 22 µF tantalum output capacitor for stability, as confirmed in the datasheet's Stability Considerations section. Ceramic capacitors alone are not recommended due to near-zero ESR causing potential oscillation; aluminum electrolytic or tantalum types provide necessary damping. Input capacitance of ≥10 µF is also required.
Is NCP1086D2T-33R4 pin-compatible with other regulators in the same family?
Yes, the NCP1086D2T-33R4 shares identical pinout (GND–VOUT–VIN) and mechanical footprint with other NCP1086 variants in D2PAK-3, including adjustable versions like NCP1086D2T-ADJR4. It is also explicitly stated as pin-compatible with the LT1086 family, though electrical differences (e.g., dropout voltage, thermal resistance) must be verified for drop-in replacement.
What thermal performance can be expected from NCP1086D2T-33R4 in D2PAK-3 package?
The NCP1086D2T-33R4 in D2PAK-3 has a typical junction-to-case thermal resistance (RJC) of 3.5°C/W and a junction-to-ambient resistance (RJA) ranging from 10 to 50°C/W depending on PCB copper area and heatsinking. With proper thermal pad soldering and ≥2 in² of 2-oz copper, RJA ≈ 25°C/W enables 1.5 A operation at 70°C ambient without active cooling.
How does the current limit protection work in NCP1086D2T-33R4?
The NCP1086D2T-33R4 features foldback current limiting that activates at 1.6–3.1 A depending on junction temperature, as specified in the Electrical Characteristics table. When triggered, it reduces output current to prevent thermal runaway while maintaining regulation until thermal shutdown engages at 150–210°C. This dual-layer protection avoids catastrophic failure during short-circuit events on the output rail.
NCP1086D2T-33R4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.4V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 10 mA
- 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:
- D2PAK-3
NCP1086D2T-33R4 FAQ
1.How can I place an order for NCP1086D2T-33R4 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1086D2T-33R4 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 NCP1086D2T-33R4 reliable?
The price and inventory of NCP1086D2T-33R4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1086D2T-33R4 is usually 5 days.
3.What payment methods are accepted for NCP1086D2T-33R4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1086D2T-33R4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1086D2T-33R4?
NCP1086D2T-33R4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1086D2T-33R4 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 NCP1086D2T-33R4?
For technical support, including NCP1086D2T-33R4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1086D2T-33R4 requirements.
6.How does Aetrix verify that NCP1086D2T-33R4 is sourced from the original manufacturer or authorized distributors?
All NCP1086D2T-33R4 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 NCP1086D2T-33R4 meets industry standards.
7.What is the process for return or replacement of NCP1086D2T-33R4?
All NCP1086D2T-33R4 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1086D2T-33R4, 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 NCP1086D2T-33R4 part is unused and in its original packaging.
Return procedure for NCP1086D2T-33R4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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