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onsemi NCP1117ST15T3
- Part No.:
- NCP1117ST15T3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCP1117ST15T3.pdf
- Description:
- IC REG LINEAR 1.5V 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:4,009
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Product details
Overview
NCP1117ST15T3 from onsemi is a 1.5 V fixed-output, low-dropout linear voltage regulator in SOT-223 package, delivering up to 1.0 A output current with 1.2 V max dropout at 800 mA and ±1.0% output voltage accuracy over temperature. It requires no minimum load for regulation and integrates thermal shutdown, current limiting, and safe operating area protection. It is used in point-of-load regulation for industrial controllers and battery chargers.
For engineers reviewing the NCP1117ST15T3 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at full load, thermal performance with PCB copper heatsinking, line/load regulation stability under transient conditions, and compatibility with 10 µF ceramic input/output capacitors.
Technical Context
The NCP1117ST15T3 employs a PNP pass transistor architecture enabling low dropout operation down to 1.07 V at 800 mA across temperature. Its internal bandgap reference is trimmed to ±1.0%, and regulation loop includes dynamic compensation via external output capacitor ESR (33 mΩ–2.2 Ω).
Protection circuitry comprises foldback current limiting, thermal shutdown activation at ~175°C, and safe operating area (SOA) compensation to prevent secondary breakdown during overload. Input voltage range spans 2.9 V to 11.5 V for stable 1.5 V output, with quiescent current of 3.6 mA at nominal conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.500 V ±1.0% (±15 mV tolerance), no minimum load required |
| Max Dropout Voltage | 1.20 V at 800 mA over temperature - enables operation with Vin as low as 2.7 V |
| Output Current | 1.0 A continuous - supports high-current microcontroller cores or FPGA I/O banks |
| Line Regulation | 0.3 mV (typ) over Vin = 2.9–11.5 V - ensures stable rail despite input ripple |
| Load Regulation | 2.3 mV (typ) over 0–800 mA - maintains tight voltage under dynamic load steps |
| Ripple Rejection | 73 dB at 120 Hz - suppresses switching noise from upstream DC/DC converters |
| Thermal Shutdown | Activates at ~175°C junction - prevents catastrophic failure during sustained overload |
Pinout & Package
SOT-223 package (Case 318H) with exposed metal tab thermally connected to Pin 2 (Output). Standard 3-pin configuration optimized for PCB copper heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground / Adjust | Reference node for internal error amplifier; tied directly to system ground for fixed-output operation |
| 2 | Output | Regulated 1.5 V supply; electrically and thermally connected to heatsink tab |
| 3 | Input | Unregulated input (2.9–11.5 V); requires local 10 µF ceramic bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout operation | 1.2 V max at 800 mA enables use with single-cell Li-ion or 3.3 V logic rails |
| ±1.0% output accuracy | Reduces need for post-regulation trimming in precision analog subsystems |
| No minimum load requirement | Eliminates wasteful bleed resistors in low-power sleep modes |
| Integrated thermal shutdown | Self-protecting behavior allows safe operation without external thermal sensors |
| Stable with 10 µF ceramic output cap | Enables compact, low-ESR designs without tantalum or electrolytic capacitors |
Applications
| Industrial PLC I/O Modules | Battery Charger Reference Rail |
|---|---|
Use Scenario: Powering isolated digital I/O drivers and analog sensor interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Primary 1.5 V LDO supplying FPGA configuration banks and ADC reference buffers. Use Value: Tight ±1.0% output accuracy ensures consistent ADC full-scale calibration across temperature. | Use Scenario: Generating stable bias voltage for charge management ICs in multi-chemistry battery chargers. IC Role / Device Role / Timing Role: Fixed 1.5 V reference rail for voltage-sense comparators and state-machine logic. Use Value: No minimum load requirement allows rail retention during charger standby without power waste. |
| Hard Drive Controller Power | Consumer Set-Top Box SoC Core Supply |
Use Scenario: Local regulation for SATA controller ASICs requiring clean 1.5 V core voltage. IC Role / Device Role / Timing Role: Low-noise 1.5 V LDO decoupling high-speed SerDes PHY blocks. Use Value: 73 dB ripple rejection suppresses switching noise from main 12 V DC/DC converter. | Use Scenario: Point-of-load regulation for ARM-based media processor cores in streaming devices. IC Role / Device Role / Timing Role: Secondary 1.5 V supply derived from 3.3 V system rail for low-voltage logic domains. Use Value: 1.2 V dropout enables operation even when 3.3 V rail sags to 2.7 V during peak CPU load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC29150-1.5WT | Higher dropout (0.4 V typ at 1.5 A), wider input range (2.5–26 V), TO-220 package | Requires heatsink for >500 mA; better suited for higher-input industrial systems | Select when input exceeds 11.5 V or thermal budget permits larger package |
| TLV1117-15CDCYR | Lower output current (800 mA), tighter initial accuracy (±0.5%), same SOT-223 footprint | Marginally lower thermal capability; preferred where precision outweighs current headroom | Select when 800 mA suffices and ±0.5% accuracy is critical for analog signal chains |
Compared with MIC29150-1.5WT and TLV1117-15CDCYR, the NCP1117ST15T3 offers optimal balance of 1.0 A output, 1.2 V dropout, and SOT-223 thermal performance for cost-sensitive industrial and consumer designs operating within its 2.9–11.5 V input window.
Availability
NCP1117ST15T3 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery charger reference rails, and hard drive controller power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for NCP1117ST15T3 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 focused on energy-efficient electronics, with leadership in power management, analog, and sensing technologies.
The NCP1117 series was designed for robust, low-cost point-of-load regulation in industrial, computing, and consumer equipment-emphasizing thermal resilience, wide input tolerance, and drop-in replacement for legacy LM317-based designs.
FAQ
What is the maximum input voltage for the NCP1117ST15T3?
The NCP1117ST15T3 supports a maximum input voltage of 11.5 V for reliable 1.5 V output regulation, as specified in the Electrical Characteristics table for fixed 1.5 V devices. Exceeding this voltage risks violating safe operating area limits, especially above 12 V where output current must be limited to ≤1.0 A per datasheet Note 3. The absolute maximum rating is 20 V, but operation beyond 11.5 V is not guaranteed for regulation stability or thermal safety.
Does the NCP1117ST15T3 require an output capacitor, and what type is recommended?
Yes, the NCP1117ST15T3 requires a minimum 4.7 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for loop stability. A 10 µF ceramic capacitor is recommended and validated in all typical application circuits. Tantalum or aluminum electrolytic types are acceptable if they meet the ESR and capacitance specifications across the full operating temperature range, but ceramic offers superior transient response and reliability.
Can the NCP1117ST15T3 be used in automotive applications?
The NCP1117ST15T3 is not AEC-Q100 qualified and is intended for industrial and consumer use. For automotive applications, the pin-compatible NCV1117ST15T3G variant is specified - it shares identical electrical characteristics but undergoes automotive-grade qualification, PPAP documentation, and unique site control. Using NCP1117ST15T3 in automotive environments voids compliance with functional safety requirements.
How does thermal performance of the NCP1117ST15T3 depend on PCB layout?
Thermal resistance (RJA) of the NCP1117ST15T3 drops from 160°C/W (minimum pad) to ~60°C/W with 2 oz. copper and ≥25 mm² heatsink area, per Figure 21. The exposed tab (Pin 2) must be soldered to a dedicated copper pour connected via multiple thermal vias to inner-layer planes. Insufficient copper area causes thermal shutdown activation at <500 mA load, while proper layout sustains 1.0 A continuously at TA = 50°C.
Is the NCP1117ST15T3 pin-compatible with the LM317?
Yes, the NCP1117ST15T3 is pin-compatible with the LM317 in SOT-223 package for fixed-output variants, but differs functionally: the LM317 is adjustable-only and requires two external resistors, whereas the NCP1117ST15T3 is a fixed 1.5 V device with integrated feedback. Direct substitution is possible only if the LM317 circuit is configured for 1.5 V output and ground pin connections match - otherwise, redesign of feedback network and bypassing is required.
NCP1117ST15T3 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):
- 20V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 800mA
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 72dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223
NCP1117ST15T3 FAQ
1.How can I place an order for NCP1117ST15T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117ST15T3 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 NCP1117ST15T3 reliable?
The price and inventory of NCP1117ST15T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117ST15T3 is usually 5 days.
3.What payment methods are accepted for NCP1117ST15T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117ST15T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117ST15T3?
NCP1117ST15T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117ST15T3 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 NCP1117ST15T3?
For technical support, including NCP1117ST15T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117ST15T3 requirements.
6.How does Aetrix verify that NCP1117ST15T3 is sourced from the original manufacturer or authorized distributors?
All NCP1117ST15T3 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 NCP1117ST15T3 meets industry standards.
7.What is the process for return or replacement of NCP1117ST15T3?
All NCP1117ST15T3 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117ST15T3, 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 NCP1117ST15T3 part is unused and in its original packaging.
Return procedure for NCP1117ST15T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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