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NXP Semiconductors NX1117C18Z,115
- Part No.:
- NX1117C18Z,115
- Manufacturer:
- NXP Semiconductors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NX1117C18Z,115.pdf
- Description:
- IC REG LINEAR 1.8V 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:1,378
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Product details
Overview
NX1117C18Z,115 from NXP Semiconductors is a fixed-output 1.8 V, ±1 % accuracy, low-dropout linear voltage regulator in SOT223 package, delivering up to 1 A output current with thermal shutdown, SOA control, and output current limiting - used as post-regulator for DC-DC converters in USB devices and hard drive controllers.
For engineers reviewing the NX1117C18Z,115 datasheet, NX1117C18Z,115 pinout, NX1117C18Z,115 application, or NX1117C18Z,115 equivalent, key selection criteria include dropout voltage at 800 mA (≤1.2 V), PSRR of 68 dB at 120 Hz, line regulation ≤4.0 mV over 3.2–11.8 V input, no minimum load requirement, and operation across −40 °C to +125 °C.
Technical Context
The NX1117C18Z,115 implements internal bandgap reference (1.25 V typ), SOA-controlled current limiting to prevent thermal runaway under high VIN–VOUT differentials, and integrated thermal shutdown triggered at 135 °C junction temperature. Its architecture eliminates external compensation and supports stable operation with 680 nF input/output capacitors.
It operates without minimum load, features 5 mA quiescent current at full input range, and maintains 1.8 V output within ±0.7 % over full temperature range. Dropout voltage rises predictably with load: 0.95 V at 100 mA, 1.07 V at 800 mA - enabling efficient use in battery-powered systems where input voltage may sag near regulation threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.800 V ±1 % (1.764–1.836 V) at 10 mA, 3.2–11.8 V input - ensures tight rail tolerance for 1.8 V logic and memory interfaces. |
| Max Output Current | 1 A continuous - sufficient for powering SoC cores, FPGAs, or multi-channel sensor subsystems from single LDO. |
| Dropout Voltage | 1.07 V max at 800 mA - enables regulation from 2.87 V input, critical for Li-ion battery discharge tail-end operation. |
| PSRR | 68 dB at 120 Hz - suppresses ripple from upstream switching regulators, reducing need for additional filtering in point-of-load designs. |
| Quiescent Current | 5–6 mA across full input range (up to 11.8 V) - minimizes standby power loss in always-on industrial monitoring nodes. |
| Operating Temp | −40 °C to +125 °C ambient - qualified for under-hood automotive modules and industrial PLC I/O stages. |
| Thermal Shutdown | 135 °C junction - protects against sustained overload or poor PCB heatsinking without external circuitry. |
Pinout & Package
SOT223 (SC-73) plastic surface-mount package with exposed thermal pad on lead 2/4; 4-pin configuration optimized for medium-power dissipation (max Ptot = 1.5 W on FR4 with 6 cm² copper pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference and thermal path - must be connected to large copper pour for thermal performance. |
| 2 | VOUT | Main regulated output - also serves as thermal pad connection; requires low-ESR capacitor (≥680 nF) close to pin. |
| 3 | VIN | Unregulated input - accepts up to 20 V; dropout behavior begins below 3.2 V input for 1.8 V output. |
| 4 | VOUT | Second output terminal - paralleled internally with pin 2 to increase current handling and reduce trace resistance. |
Key Features
| Feature | Design Value |
|---|---|
| No minimum load requirement | Enables stable regulation down to 0 mA - ideal for intermittent-load applications like wake-on-RF sensors. |
| SOA control | Automatically limits output current during high VIN–VOUT conditions to prevent thermal destruction without external foldback circuitry. |
| 1.8 V fixed output with ±1 % accuracy | Meets JEDEC JESD8-12B requirements for 1.8 V I/O rails, eliminating resistor network errors in adjustable alternatives. |
| Thermal shutdown at 135 °C | Self-protecting operation under sustained overload or ambient temperature rise - resets automatically upon cooling. |
| 68 dB PSRR at 120 Hz | Reduces conducted noise from AC-DC adapters or buck converters feeding downstream analog circuits or ADC references. |
Applications
| USB Devices | Hard Drive Controllers |
|---|---|
Use Scenario: Powering USB 2.0 PHY and controller ICs from 3.3 V or 5 V bus-derived supply. IC Role / Device Role / Timing Role: Post-regulator converting noisy switched supply to clean 1.8 V core voltage for transceivers and link-layer logic. Use Value: 68 dB PSRR suppresses switching noise that would otherwise cause packet retries or CRC errors in high-speed data transfer. |
Use Scenario: Supplying 1.8 V interface logic and buffer memory in 2.5″/3.5″ SATA HDD controller boards. IC Role / Device Role / Timing Role: Low-noise local regulator for SERDES I/O banks and flash cache controllers requiring stable voltage under dynamic load. Use Value: ±1 % output accuracy ensures timing margin compliance for DDR-type buffers; SOA control prevents latch-up during sudden spin-up current surges. |
| Consumer Equipment PoL | Industrial Point-of-Load |
Use Scenario: Providing 1.8 V rail to image signal processors (ISP) and MIPI CSI-2 receivers in smart cameras. IC Role / Device Role / Timing Role: Dedicated LDO for noise-sensitive analog front-end and clock domain isolation. Use Value: 0.003 % RMS output noise avoids quantization artifacts in 12-bit+ image pipelines; no minimum load allows sleep-mode zero-current operation. |
Use Scenario: Regulating 1.8 V for FPGA configuration I/O banks and real-time Ethernet MACs in programmable logic controllers. IC Role / Device Role / Timing Role: High-reliability local regulator supporting extended temperature operation and long-term stability (0.3 % drift over 1000 h). Use Value: −40 °C to +125 °C rating enables direct mounting on motor-drive PCBs; thermal shutdown prevents field failures during enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV1117-18CDR | ±2 % output accuracy; higher dropout (1.3 V at 800 mA); 10 µA quiescent current | Lower precision and efficiency - suitable only where 1.8 V tolerance > ±2 % is acceptable | Select TLV1117-18CDR only if cost sensitivity outweighs accuracy and thermal performance requirements. |
| LD1117S18TR | ±2 % accuracy; no SOA control; thermal shutdown at 160 °C; 10 mA quiescent current | Lacks safe operating area protection - risk of thermal runaway under high VIN–VOUT stress | Choose LD1117S18TR only for benign ambient environments with tightly controlled input voltage and derated load. |
Compared with TLV1117-18CDR and LD1117S18TR, NX1117C18Z,115 delivers tighter output accuracy (±1 % vs. ±2 %), lower dropout (1.07 V vs. ≥1.3 V), and active SOA control - making it preferable for thermally constrained, high-reliability 1.8 V point-of-load applications.
Availability
NX1117C18Z,115 is available at Aetrix Electronics and suitable for USB devices, hard drive controllers, consumer equipment point-of-load, and industrial embedded systems requiring stable component supply with full traceability and lifecycle support.
Supply support for NX1117C18Z,115 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The NX1117C series was designed specifically for high-accuracy, high-current point-of-load regulation in space-constrained applications where thermal robustness and ripple rejection are critical - targeting USB, storage, and industrial control subsystems.
FAQ
What is the maximum input voltage rating for NX1117C18Z,115?
The absolute maximum input voltage for NX1117C18Z,115 is 20 V, as specified in Table 5 "Limiting values" of the NXP datasheet. Operation above this level risks permanent damage. For reliable 1.8 V regulation, input must remain ≥3.2 V per Table 8's recommended operating conditions - ensuring sufficient headroom for the 1.07 V max dropout at full load.
Does NX1117C18Z,115 require an external capacitor on the ADJ pin?
No - NX1117C18Z,115 is a fixed-output variant and does not have an ADJ pin. Pin 1 is GND, not ADJ. Only the adjustable versions (e.g., NX1117CADJZ) use the ADJ pin and require external resistors. This simplifies layout and eliminates resistor tolerance errors in 1.8 V applications.
What is the thermal resistance (Rth(j-a)) of NX1117C18Z,115 on a standard FR4 PCB?
On a standard FR4 PCB with single-sided copper and tin plating (no enhanced thermal pad), Rth(j-a) for NX1117C18Z,115 is 150 K/W, per Table 7 "Thermal characteristics". With a 6 cm² copper pad on the output pins, it improves to 72 K/W - directly impacting maximum sustainable output current at elevated ambient temperatures.
How does the SOA control function in NX1117C18Z,115?
SOA control in NX1117C18Z,115 dynamically limits output current when VIN–VOUT exceeds safe levels, preventing thermal runaway by reducing IOUT before junction temperature reaches destructive thresholds. Unlike simple current limiting, SOA adapts to both voltage differential and temperature - documented in Figure 9 and footnote [1] of the datasheet.
Is NX1117C18Z,115 compatible with ceramic output capacitors?
Yes - NX1117C18Z,115 is explicitly characterized with 680 nF ceramic capacitors (in series with 1 Ω ESR) per Table 8 test conditions. It remains stable with low-ESR ceramics, unlike older LDOs requiring tantalum or aluminum electrolytics - enabling smaller, more reliable, and longer-life output filtering.
NX1117C18Z,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 800mA
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 68dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-73
NX1117C18Z,115 FAQ
1.How can I place an order for NX1117C18Z,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for NX1117C18Z,115 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 NX1117C18Z,115 reliable?
The price and inventory of NX1117C18Z,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NX1117C18Z,115 is usually 5 days.
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NX1117C18Z,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NX1117C18Z,115 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 NX1117C18Z,115?
For technical support, including NX1117C18Z,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NX1117C18Z,115 requirements.
6.How does Aetrix verify that NX1117C18Z,115 is sourced from the original manufacturer or authorized distributors?
All NX1117C18Z,115 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 NX1117C18Z,115 meets industry standards.
7.What is the process for return or replacement of NX1117C18Z,115?
All NX1117C18Z,115 units undergo pre-shipment inspection (PSI). If there is an issue with NX1117C18Z,115, 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 NX1117C18Z,115 part is unused and in its original packaging.
Return procedure for NX1117C18Z,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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