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onsemi NCV1117ST25T3
- Part No.:
- NCV1117ST25T3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCV1117ST25T3.pdf
- Description:
- IC REG LINEAR 2.5V 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:1,377
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Product details
Overview
NCV1117ST25T3 from onsemi is an automotive-grade, low-dropout linear voltage regulator delivering a fixed 2.5 V output at up to 1.0 A with ±1.0% output voltage accuracy, 1.2 V max dropout at 800 mA, and integrated thermal shutdown, current limiting, and safe operating area protection. It serves as a point-of-load regulator in battery chargers, hard drive controllers, and automotive infotainment power rails.
For engineers reviewing the NCV1117ST25T3 datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 qualification, SOT-223 package thermal performance, no-minimum-load requirement for regulation, and compatibility with 20 V max input in harsh-temperature environments (−40°C to +125°C).
Technical Context
The NCV1117ST25T3 implements a bandgap-referenced feedback loop with on-chip trimming to achieve ±1.0% initial output voltage accuracy across temperature. Its internal protection architecture includes foldback current limiting, junction temperature monitoring triggering thermal shutdown at ~175°C, and safe operating area compensation to prevent secondary breakdown during transient overloads.
Designed for automotive and industrial applications, it operates from 3.9 V to 10 V input while maintaining regulation across 0–800 mA load range, with line regulation of ≤0.5 mV and load regulation of ≤3.3 mV - enabling stable 2.5 V supply for precision analog circuits, microcontroller I/O rails, and sensor interfaces without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±1.0% at 10 mA, 25°C; maintains regulation from 0–800 mA load with no minimum load required. |
| Max Input Voltage | 20 V - supports wide-input post-regulation after switching converters or unregulated automotive battery supplies. |
| Dropout Voltage | 1.2 V max at 800 mA and full temperature range - enables operation with only 3.7 V input at full load. |
| Output Current | 1.0 A continuous - sufficient for powering SoC cores, FPGA I/O banks, or multi-sensor subsystems. |
| Thermal Shutdown | Activates at ~175°C junction temperature - protects against sustained overload or inadequate heatsinking. |
| Quiescent Current | 5.2 mA typical at Vin = 10 V - low enough for always-on automotive modules without excessive standby drain. |
| Ripple Rejection | 64 dB at 120 Hz, Vin−Vout = 6.4 V - suppresses low-frequency switching noise from upstream DC/DC stages. |
Pinout & Package
SOT-223 package (Case 318H), surface-mount, with exposed metal tab thermally and electrically connected to Pin 2 (Output). Requires minimum copper pad per Figure 21 for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground / Adjust | Reference node for internal error amplifier; tied directly to system ground; no external resistor needed for fixed-output version. |
| 2 | Output | Regulated 2.5 V supply rail; connected to exposed tab for thermal conduction and low-impedance return path. |
| 3 | Input | Unregulated input (3.9–10 V typical); requires local 10 µF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive applications with guaranteed −40°C to +125°C operation and PPAP support. |
| No minimum load requirement | Stable regulation down to 0 mA output - eliminates need for dummy loads in low-power sleep modes. |
| Integrated protection | Combines current limit, thermal shutdown, and SOA compensation - reduces external component count and failure modes. |
| Low dropout at full load | 1.2 V max dropout at 800 mA ensures usable headroom even with aging battery or high-impedance input sources. |
| Pb-free SOT-223 package | RoHS-compliant, surface-mountable package with thermal tab optimized for PCB copper heatsinking. |
Applications
| Automotive Infotainment Power Rail | Hard Drive Controller LDO |
|---|---|
Use Scenario: Supplies clean 2.5 V to audio DACs, display interface logic, and touch controller ICs in head units under varying battery conditions (9–16 V). IC Role / Device Role / Timing Role: Primary low-noise, low-dropout post-regulator ensuring stable voltage despite engine cranking dips and alternator ripple. Use Value: Maintains ±1.0% output accuracy and 64 dB ripple rejection to prevent audible noise and display artifacts. | Use Scenario: Powers servo control circuitry and buffer memory in 2.5-inch HDDs where space and thermal constraints limit heatsink size. IC Role / Device Role / Timing Role: Fixed-output LDO delivering regulated 2.5 V to spindle motor drivers and SATA PHY logic. Use Value: Delivers 1.0 A with 1.2 V dropout, enabling operation from 3.7 V input - critical for compact designs with minimal input margin. |
| Battery Charger Reference Supply | Industrial Sensor Node Regulator |
Use Scenario: Provides precise 2.5 V reference to ADCs and charge management ICs in Li-ion fast-charging adapters operating across universal AC inputs. IC Role / Device Role / Timing Role: Stable voltage reference source with low thermal drift and high PSRR for accurate battery voltage/current sensing. Use Value: ±0.5% temperature stability and 0.3% long-term drift ensure consistent charging profiles over product lifetime. | Use Scenario: Powers MEMS accelerometers, temperature sensors, and wireless transceivers in IP67-rated industrial condition monitors deployed in factory floors. IC Role / Device Role / Timing Role: Robust, AEC-Q100-aligned LDO supplying 2.5 V to mixed-signal sensor front-ends in extended-temperature environments. Use Value: Guaranteed −40°C to +125°C operation and built-in thermal shutdown prevent field failures due to ambient heat buildup. |
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 |
|---|---|---|---|
| TLV1117-25CDCYR | 2.5 V fixed, 800 mA max output, 1.2 V dropout, −40°C to +125°C, but not AEC-Q100 qualified. | Targeted at commercial/industrial use; lacks automotive qualification and PPAP documentation. | Select when automotive qualification is unnecessary and cost sensitivity outweighs qualification requirements. |
| LD1117S25TR | 2.5 V fixed, 800 mA max, 1.1 V dropout, −40°C to +125°C, Pb-free SOT-223, but no AEC-Q100 certification. | Used in consumer electronics and white goods; lacks automotive change control and site-specific validation. | Choose for non-automotive embedded systems where thermal performance and footprint match but qualification is not mandated. |
Compared with TLV1117-25CDCYR and LD1117S25TR, the NCV1117ST25T3 uniquely provides AEC-Q100 qualification, guaranteed ±1.0% output accuracy, and automotive-grade process controls - making it the only option suitable for safety-critical vehicle subsystems requiring PPAP compliance and extended-temperature reliability.
Availability
NCV1117ST25T3 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and battery charger reference supplies requiring stable component supply, long lifecycle assurance, and traceable sourcing.
Supply support for NCV1117ST25T3 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT markets.
The NCV1117 series belongs to onsemi's automotive-qualified linear regulator product line, designed specifically to meet stringent AEC-Q100 requirements for functional safety, thermal robustness, and long-term reliability in vehicle electronic control units.
FAQ
What is the maximum input voltage rating for the NCV1117ST25T3?
The NCV1117ST25T3 has a maximum input voltage rating of 20 V, as specified in the Absolute Maximum Ratings table. This allows it to operate safely downstream of unregulated automotive battery supplies or high-voltage switching converter outputs, provided the dropout constraint (Vin ≥ Vout + dropout) is met for the desired load current and temperature conditions. The NCV1117ST25T3 maintains regulation across its full operating range only when input remains within 3.9 V to 10 V for optimal performance.
Does the NCV1117ST25T3 require an external output capacitor, and what are the specifications?
Yes, the NCV1117ST25T3 requires a mandatory output capacitor (Cout) for stability. The datasheet specifies a minimum of 4.7 µF with ESR between 33 mΩ (typ) and 2.2 Ω. Ceramic, tantalum, or aluminum electrolytic types are acceptable if they meet these limits across the full operating temperature range. A 10 µF ceramic capacitor is commonly used and recommended in typical application circuits for the NCV1117ST25T3 to ensure robust transient response and loop stability.
Is the NCV1117ST25T3 pin-compatible with older regulators like the LM317?
No, the NCV1117ST25T3 is not pin-compatible with the LM317. While the NCP1117 series (commercial grade) is stated to be pin-compatible with the LM317, the NCV1117ST25T3 uses the same SOT-223 pinout (Pin 1 = Ground, Pin 2 = Output, Pin 3 = Input) as other NCV1117 fixed-output variants - which differs from the LM317's TO-220 pinout (Pin 1 = Adjust, Pin 2 = Output, Pin 3 = Input). Direct replacement requires PCB layout revision. The NCV1117ST25T3 is functionally compatible but not mechanically interchangeable with the LM317.
What thermal derating applies to the NCV1117ST25T3 in a standard SOT-223 footprint?
In a standard SOT-223 footprint with minimum copper pad (Case 318H), the NCV1117ST25T3 has a junction-to-ambient thermal resistance (RJA) of 160°C/W. At an ambient temperature of 50°C and maximum junction temperature of 150°C, the maximum allowable power dissipation is approximately 0.625 W. For a 2.5 V output with 1.0 A load and 7 V input (4.5 V dropout), power dissipation would be 4.5 W - far exceeding this limit. Therefore, adequate PCB copper area (≥1 in² 2 oz. copper) or external heatsinking is required to sustain full-load operation. Derating curves are shown in Figure 21 of the NCV1117ST25T3 datasheet.
How does the NCV1117ST25T3 handle short-circuit conditions?
The NCV1117ST25T3 incorporates internal current limiting and thermal shutdown to manage short-circuit events. Under output short, it enters constant-current foldback mode to limit peak current to approximately 1.5 A (typical), then activates thermal shutdown if junction temperature exceeds ~175°C. The device cycles on/off until fault is removed. Short-circuit duration is rated as "infinite" in the Absolute Maximum Ratings, meaning it can survive indefinite shorts without damage when properly heatsunk - a key reliability feature confirmed in the NCV1117ST25T3 datasheet.
NCV1117ST25T3 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):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 800mA
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 68dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223
NCV1117ST25T3 FAQ
1.How can I place an order for NCV1117ST25T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV1117ST25T3 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 NCV1117ST25T3 reliable?
The price and inventory of NCV1117ST25T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV1117ST25T3 is usually 5 days.
3.What payment methods are accepted for NCV1117ST25T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV1117ST25T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV1117ST25T3?
NCV1117ST25T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV1117ST25T3 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 NCV1117ST25T3?
For technical support, including NCV1117ST25T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV1117ST25T3 requirements.
6.How does Aetrix verify that NCV1117ST25T3 is sourced from the original manufacturer or authorized distributors?
All NCV1117ST25T3 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 NCV1117ST25T3 meets industry standards.
7.What is the process for return or replacement of NCV1117ST25T3?
All NCV1117ST25T3 units undergo pre-shipment inspection (PSI). If there is an issue with NCV1117ST25T3, 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 NCV1117ST25T3 part is unused and in its original packaging.
Return procedure for NCV1117ST25T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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