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onsemi NCP1086ST-33T3
- Part No.:
- NCP1086ST-33T3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCP1086ST-33T3.pdf
- Description:
- IC REG LINEAR 3.3V 1.5A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:2,613
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Product details
Overview
NCP1086ST-33T3 from onsemi is a 3.3 V fixed-output linear regulator delivering up to 1.5 A output current, featuring ±1.5% output voltage accuracy over temperature, 1.05 V typical dropout voltage at full load, fast transient response, and integrated thermal shutdown and current limit protection. It serves as a post-regulator for microprocessor core supplies in embedded power systems requiring stable low-voltage operation.
For engineers reviewing the NCP1086ST-33T3 datasheet, pinout, applications, or equivalent options, key selection considerations include dropout performance at 1.5 A, thermal regulation stability under load transients, GND/VOUT/VIN pin configuration in SOT-223, and compatibility with tantalum output capacitors for microprocessor supply decoupling.
Technical Context
The NCP1086ST-33T3 implements a composite PNP-NPN pass transistor architecture optimized for low dropout and fast loop response. Its internal bandgap reference (1.254 V typical) and error amplifier maintain regulation across input differentials from 2.0 V to 3.7 V at full load.
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. Ripple rejection reaches 80 dB at 120 Hz with 1.0 VP-P input ripple and 3.0 V input-output differential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±1.5% - tightly regulated fixed output suitable for 3.3 V logic and I/O rails. |
| Max Output Current | 1.5 A - supports high-current digital loads including microprocessor cores and FPGAs. |
| Dropout Voltage | 1.05 V (typ) @ 1.5 A - enables operation with only 4.35 V input for 3.3 V output, minimizing power loss. |
| Line Regulation | 0.02% (typ) - ensures minimal output variation across input voltage changes (2.0–3.7 V differential). |
| Load Regulation | 0.04% (typ) - maintains stable output despite load shifts from 10 mA to 1.5 A. |
| Ripple Rejection | 80 dB @ 120 Hz - suppresses AC ripple from upstream switching converters feeding the regulator. |
| Quiescent Current | 5.0–10 mA - low bias current reduces no-load power consumption in always-on subsystems. |
Pinout & Package
SOT-223 package (Case 318E), surface-mount, thermally enhanced with exposed tab connected to VOUT. Pin 1 = GND, Pin 2 = VOUT, Pin 3 = VIN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Low-impedance return path for feedback and internal circuitry; must be routed with minimal trace inductance. |
| 2 (VOUT) | Regulated output | Power delivery node; also electrically connected to exposed thermal tab for heatsinking. |
| 3 (VIN) | Input supply | Accepts 4.35–7.0 V input; requires local 10 µF input capacitor to suppress high-frequency noise. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Sub-10 µs recovery from 750 mA → 1.5 A load step, minimizing voltage droop in CPU burst modes. |
| Thermal shutdown with hysteresis | 150–210 °C activation range and 25 °C hysteresis prevent thermal oscillation during sustained overload. |
| Stable with 22 µF tantalum output cap | No external compensation required; avoids instability issues common with low-ESR ceramic capacitors. |
| ±1.5% output accuracy over temp | Ensures reliable 3.3 V rail compliance across −40 °C to +70 °C ambient operating range. |
| Pb-free SOT-223 package | RoHS-compliant construction with JEDEC-standard footprint for automated assembly and reflow. |
Applications
| Microprocessor Core Supply | FPGA I/O Bank Regulator |
|---|---|
Use Scenario: Powers ARM Cortex-A series CPU cores requiring clean, low-noise 3.3 V at up to 1.5 A peak current during instruction fetch bursts. IC Role / Device Role / Timing Role: Post-regulator providing final-stage voltage stabilization after a buck converter, ensuring tight DC accuracy and fast transient immunity. Use Value: 1.05 V dropout enables use of 5 V intermediate bus, reducing heat dissipation vs. higher-dropout alternatives while maintaining 3.3 V tolerance. | Use Scenario: Supplies configurable I/O banks in Xilinx Artix-7 FPGAs where rail integrity directly impacts signal integrity and timing closure. IC Role / Device Role / Timing Role: Low-noise linear regulator delivering stable 3.3 V to parallel I/O structures, rejecting switching noise from adjacent DC/DC converters. Use Value: 80 dB ripple rejection at 120 Hz suppresses low-frequency switching artifacts that cause jitter in high-speed I/O interfaces. |
| Industrial PLC Digital I/O Module | Automotive Body Control Unit (BCU) |
Use Scenario: Provides isolated 3.3 V rail for optocoupler drivers and level-shifting logic in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary linear regulator for digital interface circuitry, operating continuously across −40 °C to +70 °C industrial temperature range. Use Value: ±1.5% output accuracy and 0.04% load regulation ensure consistent logic thresholds and reliable state detection under varying load conditions. | Use Scenario: Supplies 3.3 V to CAN transceiver interfaces and microcontroller peripherals in non-safety-critical automotive body electronics. IC Role / Device Role / Timing Role: Secondary regulator downstream of main vehicle battery DC/DC, handling transient load steps from window motor control pulses. Use Value: Fast transient response limits output deviation to <±120 mV during 750 mA load steps, preventing CAN frame corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1086CM-3.3#PBF | Pin-compatible but higher 1.3 V typical dropout; ±1% output accuracy; higher quiescent current (10–15 mA). | Same SOT-223 footprint and GND/VOUT/VIN pinout; requires larger input headroom for same load current. | Select when legacy LT1086 design reuse is prioritized over dropout efficiency. |
| TLV1117-33CDCYR | Lower 1.2 A max output; 1.2 V typical dropout; ±2% output accuracy; no thermal hysteresis specification. | Smaller SOT-223 variant (same pinout); lacks guaranteed thermal hysteresis and ripple rejection data above 1 kHz. | Select for cost-sensitive, lower-current applications where 1.2 A suffices and thermal margin is less critical. |
Compared with LT1086CM-3.3#PBF and TLV1117-33CDCYR, the NCP1086ST-33T3 delivers superior dropout performance at 1.5 A, tighter output accuracy over temperature, and documented thermal hysteresis-making it preferred for high-current, thermally constrained microprocessor and FPGA supply designs.
Availability
NCP1086ST-33T3 is available at Aetrix Electronics and suitable for microprocessor core supplies, FPGA I/O regulation, industrial PLC digital modules, and automotive body control units requiring stable component supply with full production traceability.
Supply support for NCP1086ST-33T3 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, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The NCP1086ST-33T3 belongs to onsemi's NCP1086 linear regulator family, engineered specifically for high-current post-regulation in space-constrained embedded systems where low dropout, fast transient response, and robust thermal protection are mandatory.
FAQ
What is the maximum input voltage for the NCP1086ST-33T3?
The NCP1086ST-33T3 has an absolute maximum input-to-output voltage differential of 7.0 V. Since its output is fixed at 3.3 V, the maximum allowable input voltage is 10.3 V. However, recommended operation limits VIN to ≤7.0 V above ground (i.e., ≤10.3 V) to ensure reliability under all conditions, especially during startup and short-circuit events. Exceeding this risks damage before thermal or current protection activates.
Does the NCP1086ST-33T3 require an external capacitor for stability?
Yes, the NCP1086ST-33T3 requires a minimum 22 µF tantalum output capacitor for guaranteed stability, as specified in the datasheet. Ceramic capacitors alone are not recommended due to their near-zero ESR, which can induce oscillation. A 10 µF tantalum or aluminum electrolytic input capacitor is also required to suppress high-frequency noise and ensure proper transient response. The NCP1086ST-33T3 does not include internal compensation for low-ESR capacitors.
How is thermal protection implemented in the NCP1086ST-33T3?
The NCP1086ST-33T3 features fully tested thermal shutdown that activates between 150 °C and 210 °C, with 25 °C hysteresis to prevent cycling. This protection is 100% functionally tested in production. When triggered, the device disables the pass transistor until junction temperature falls below the hysteresis threshold. The SOT-223 package has a typical RJA of 156 °C/W, so adequate PCB copper area or optional heatsinking is required to sustain 1.5 A continuous output without tripping.
Can the NCP1086ST-33T3 be used with ceramic output capacitors?
No-ceramic output capacitors are not recommended for the NCP1086ST-33T3. Its internal compensation is optimized for tantalum or aluminum electrolytic capacitors with ≥0.1 Ω ESR. Using low-ESR ceramics may cause instability and oscillation, as confirmed by the datasheet's Stability Considerations section. If ceramic capacitance is needed for high-frequency decoupling, it must be placed in parallel with the mandatory 22 µF tantalum capacitor, not as a replacement.
What is the purpose of the exposed thermal pad on the NCP1086ST-33T3 SOT-223 package?
The exposed thermal pad on the NCP1086ST-33T3 SOT-223 package is electrically connected to the VOUT pin and serves as the primary thermal conduction path from the die to the PCB. It must be soldered to a large copper pour (minimum 100 mm² recommended) to achieve the specified RJA of 156 °C/W. Failure to properly connect this pad results in excessive junction temperature rise, premature thermal shutdown, and reduced reliability-especially at 1.5 A output current.
NCP1086ST-33T3 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:
- 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:
- SOT-223 (TO-261)
NCP1086ST-33T3 FAQ
1.How can I place an order for NCP1086ST-33T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1086ST-33T3 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-33T3 reliable?
The price and inventory of NCP1086ST-33T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1086ST-33T3 is usually 5 days.
3.What payment methods are accepted for NCP1086ST-33T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1086ST-33T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1086ST-33T3?
NCP1086ST-33T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1086ST-33T3 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-33T3?
For technical support, including NCP1086ST-33T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1086ST-33T3 requirements.
6.How does Aetrix verify that NCP1086ST-33T3 is sourced from the original manufacturer or authorized distributors?
All NCP1086ST-33T3 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-33T3 meets industry standards.
7.What is the process for return or replacement of NCP1086ST-33T3?
All NCP1086ST-33T3 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1086ST-33T3, 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-33T3 part is unused and in its original packaging.
Return procedure for NCP1086ST-33T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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