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onsemi NCP1086ST-33T3G
- Part No.:
- NCP1086ST-33T3G
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCP1086ST-33T3G.pdf
- Description:
- IC REG LINEAR 3.3V 1.5A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:3,047
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Product details
Overview
NCP1086ST-33T3G from onsemi is a 3.3 V fixed-output, 1.5 A low-dropout linear regulator in SOT-223 package, featuring ±1.5% output voltage accuracy over temperature, 1.05 V typical dropout at full load, and integrated thermal shutdown and current limiting. It serves as a post-regulator for microprocessor core supplies and embedded power rails requiring stable low-voltage operation.
For engineers reviewing the NCP1086ST-33T3G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage under 1.4 V at 1.5 A, fast transient response for digital load steps, GND/VOUT/VIN pin configuration in SOT-223, and compatibility with tantalum output capacitors ≥22 µF.
Technical Context
The NCP1086ST-33T3G implements a composite PNP-NPN pass transistor architecture optimized for low dropout and high current capability. Its internal bandgap reference and error amplifier maintain regulation with <0.4% load regulation and <0.2% line regulation across operating conditions.
Thermal shutdown activates at 150–210°C with 25°C hysteresis, and current limit triggers between 1.6 A and 3.1 A depending on junction temperature. Ripple rejection exceeds 80 dB at 120 Hz, supporting clean power delivery in noise-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±1.5% - ensures stable core supply for 3.3 V logic and microcontrollers |
| Max Output Current | 1.5 A - supports moderate-power digital loads without external boost circuitry |
| Dropout Voltage | 1.05 V (typ) @ 1.5 A - enables operation from 4.35 V input, critical for battery-backed or multi-rail systems |
| Line Regulation | 0.02% (typ) - minimizes output variation during input rail fluctuations |
| Load Regulation | 0.04% (typ) - maintains tight voltage control across 10 mA to 1.5 A load range |
| Ripple Rejection | 80 dB @ 120 Hz - suppresses rectified AC ripple from upstream switching stages |
| Quiescent Current | 5.0 mA (typ) - reduces no-load power loss in always-on subsystems |
Pinout & Package
SOT-223 package (Case 318E), thermally enhanced with tab connected to VOUT; footprint compatible with standard SOT-223 land patterns and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal error amplifier and thermal shutdown comparator |
| 2 | VOUT | Regulated 3.3 V output; electrically tied to metal tab for thermal conduction |
| 3 | VIN | Input supply connection; must remain ≤7.0 V above VOUT to avoid absolute maximum violation |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Architecture | 1.05 V typical dropout at 1.5 A enables efficient 3.3 V generation from 5 V or 4.5 V rails |
| Fast Transient Response | Sub-10 µs recovery from 750 mA load step ensures stable voltage during CPU burst activity |
| Integrated Fault Protection | Current limit (1.6–3.1 A) and thermal shutdown (150–210°C) prevent damage during overload or poor heatsinking |
| Pb-Free Construction | RoHS-compliant SOT-223 package meets global environmental compliance requirements |
| Stable with Tantalum Capacitors | Guaranteed stability with 22 µF tantalum output capacitor eliminates need for ESR tuning |
Applications
| Microprocessor Core Supply | Industrial I/O Module Power |
|---|---|
Use Scenario: Providing clean 3.3 V power to ARM Cortex-M4 microcontroller cores with dynamic current draw up to 1.2 A. IC Role / Device Role / Timing Role: Post-regulator delivering tightly regulated voltage after a primary DC-DC converter. Use Value: 1.05 V dropout allows use of 4.5 V intermediate rail, reducing heat dissipation vs. higher-dropout alternatives. | Use Scenario: Powering isolated digital I/O channels in programmable logic controllers with ambient temperatures up to +70°C. IC Role / Device Role / Timing Role: Local point-of-load regulator ensuring immunity to backplane voltage sag. Use Value: ±1.5% output accuracy and 0.04% load regulation maintain sensor interface integrity across full load range. |
| Medical Diagnostic Sensor Interface | Automotive Body Control Unit |
Use Scenario: Supplying analog front-end circuitry for ECG signal conditioning where noise and drift directly impact diagnostic accuracy. IC Role / Device Role / Timing Role: Low-noise linear regulator filtering switching noise from upstream buck converters. Use Value: 80 dB ripple rejection at 120 Hz suppresses mains-derived interference in battery-operated portable devices. | Use Scenario: Powering CAN transceiver and microcontroller peripherals in non-safety-critical body modules. IC Role / Device Role / Timing Role: Secondary regulator deriving 3.3 V from vehicle 5 V rail with thermal robustness. Use Value: Thermal shutdown with 25°C hysteresis prevents latch-up during sustained high-temperature operation in engine bay proximity. |
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 tolerance | Same SOT-223 footprint; requires higher minimum input voltage (≥4.6 V) | Choose when tighter initial accuracy is prioritized over dropout performance |
| TLV1117-33CDCYR | Lower 1.2 A max current; 1.2 V typical dropout; different pinout (VIN-GND-VOUT) | Requires PCB layout change; suitable only for sub-1.2 A loads | Choose for cost-sensitive designs with relaxed current and thermal requirements |
Compared with LT1086CM-3.3#PBF, NCP1086ST-33T3G delivers lower dropout for marginal input rails; compared with TLV1117-33CDCYR, it supports higher current and uses GND/VOUT/VIN pin order-critical for drop-in replacement in existing layouts designed for LT1086-family regulators.
Availability
NCP1086ST-33T3G is available at Aetrix Electronics and suitable for microprocessor core supplies, industrial I/O modules, medical sensor interfaces, and automotive body control units requiring stable component supply with Pb-free compliance and SOT-223 thermal performance.
Supply support for NCP1086ST-33T3G 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 sensing solutions for automotive, industrial, and cloud infrastructure markets.
The NCP1086 series was engineered specifically for high-current, low-dropout post-regulation in microprocessor and FPGA power domains where thermal efficiency and transient response are critical.
FAQ
What is the maximum input voltage for NCP1086ST-33T3G?
The absolute maximum input-to-output voltage differential for NCP1086ST-33T3G is 7.0 V. Since the output is fixed at 3.3 V, VIN must not exceed 10.3 V. Exceeding this rating risks permanent device damage, especially during short-circuit events where thermal protection may not act quickly enough.
Does NCP1086ST-33T3G require an external capacitor for stability?
Yes, NCP1086ST-33T3G requires a minimum 22 µF tantalum output capacitor for guaranteed stability, as specified in the datasheet. Ceramic capacitors alone are not recommended due to near-zero ESR, which can cause oscillation. A parallel combination of tantalum and ceramic capacitors improves transient response while maintaining loop stability.
Is NCP1086ST-33T3G pin-compatible with other regulators?
NCP1086ST-33T3G is pin-compatible with the LT1086 family in SOT-223 package (GND/VOUT/VIN pinout), enabling direct replacement in legacy designs. It is not pin-compatible with TLV1117 or AMS1117 variants, which use VIN/GND/VOUT ordering and lack thermal shutdown hysteresis.
What thermal resistance values apply to NCP1086ST-33T3G in SOT-223?
NCP1086ST-33T3G has a typical junction-to-case thermal resistance (RJC) of 15°C/W and a junction-to-ambient resistance (RJA) of 156°C/W on standard FR-4 PCB with 1 in² copper pour. For continuous 1.5 A operation, a heatsink or thermal pad is strongly recommended to keep junction temperature below 150°C.
How does the current limit function in NCP1086ST-33T3G?
The current limit in NCP1086ST-33T3G is foldback-type, activating between 1.6 A and 3.1 A depending on junction temperature. At room temperature, it typically trips at ~2.3 A. Once triggered, output current reduces to protect the pass transistor; recovery occurs automatically after thermal cooldown or load removal.
NCP1086ST-33T3G 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-33T3G FAQ
1.How can I place an order for NCP1086ST-33T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1086ST-33T3G 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-33T3G reliable?
The price and inventory of NCP1086ST-33T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1086ST-33T3G is usually 5 days.
3.What payment methods are accepted for NCP1086ST-33T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1086ST-33T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1086ST-33T3G?
NCP1086ST-33T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1086ST-33T3G 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-33T3G?
For technical support, including NCP1086ST-33T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1086ST-33T3G requirements.
6.How does Aetrix verify that NCP1086ST-33T3G is sourced from the original manufacturer or authorized distributors?
All NCP1086ST-33T3G 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-33T3G meets industry standards.
7.What is the process for return or replacement of NCP1086ST-33T3G?
All NCP1086ST-33T3G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1086ST-33T3G, 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-33T3G part is unused and in its original packaging.
Return procedure for NCP1086ST-33T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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