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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

onsemi NCP1117DT18T5

Name: NCP1117DT18T5
Brand: onsemi
SKU: NCP1117DT18T5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCP1117DT18T5

Manufacturer:: onsemi

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: NCP1117DT18T5.pdf

Description:: IC REG LINEAR 1.8V 1A DPAK

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Product details

Overview

NCP1117DT18T5 from onsemi is a 1.8 V fixed-output, low-dropout linear voltage regulator in DPAK package, delivering up to 1.0 A output current with 1.2 V max dropout at 800 mA, ±1.0% output voltage accuracy, and integrated thermal shutdown, current limiting, and safe operating area protection. It serves as a point-of-load regulator in industrial power supplies and hard drive controllers.

For engineers reviewing the NCP1117DT18T5 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at full load, thermal performance in DPAK layout, no-minimum-load operation, and compatibility with 10 µF ceramic output capacitance for stability.

Technical Context

The NCP1117DT18T5 uses a PNP pass transistor architecture enabling low dropout performance across temperature. Its internal bandgap reference is trimmed to ±1.0% and stabilized against line/load/temperature variations via feedback loop compensation designed for 4.7–10 µF output capacitors with ESR between 33 mΩ and 2.2 Ω.

It operates from 3.2 V to 11.8 V input (min VIN = VOUT + dropout), supports infinite output short-circuit duration, and features an exposed heatsink tab electrically connected to Pin 2 (Output) - requiring PCB copper pour for thermal management per Figures 21–22 in the datasheet.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.8 V ±1.0% (guaranteed regulation over 0–800 mA load, 3.2–11.8 V input, −40°C to +125°C)
Max Dropout Voltage	1.2 V at 800 mA (enables operation with only 3.0 V input at full load)
Output Current	1.0 A continuous (internally limited; derates above TJ = 125°C)
Input Voltage Range	3.2 V to 11.8 V (VIN must exceed VOUT by ≥ dropout margin; absolute max = 20 V)
Quiescent Current	4.2 mA typical (low bias current improves efficiency in standby modes)
Ripple Rejection	72 dB at 120 Hz (measured at 500 mA load, 6.4 V differential; critical for post-regulation of switching supplies)
Thermal Shutdown	Activates at ~175°C junction (protects against sustained overload; requires heatsinking for >0.8 W dissipation at TA = 50°C)

Pinout & Package

DPAK (Case 369C) surface-mount package with exposed metal tab thermally and electrically connected to Pin 2 (Output). Requires minimum 2.0 oz copper pad for thermal performance; R_JA = 67°C/W with minimal pad, down to ~6.0°C/W junction-to-case.

Pin/Terminal	Circuit Role	Design Meaning
1	Ground	Reference node for internal error amplifier; connects to system ground plane; not internally tied to heatsink tab
2	Output	Regulated 1.8 V supply; electrically and thermally connected to exposed heatsink tab - must be routed to large copper pour
3	Input	Unregulated DC input (3.2–11.8 V); requires local 10 µF ceramic bypass capacitor placed adjacent to pin

Key Features

Feature	Design Value
No minimum load requirement	Stable regulation from 0 mA to 1.0 A - eliminates need for dummy load resistors in low-power sleep states
Fixed 1.8 V output	Eliminates external resistor network; reduces BOM count and layout area vs. adjustable variants
Thermal shutdown with auto-recovery	Prevents catastrophic failure during transient overloads; cycles output until die cools below ~160°C
Pb-free DPAK package	RoHS-compliant; compatible with standard reflow profiles; heatsink tab enables direct PCB thermal conduction
100% current limit tested	Guarantees ≥1000 mA output before foldback - simplifies design margining for 800 mA target loads

Applications

Industrial Point-of-Load Regulation	Hard Drive Controller Power
Use Scenario: Providing clean 1.8 V rail to FPGA I/O banks or microcontroller core logic in factory automation PLCs. IC Role / Device Role / Timing Role: Primary LDO regulator supplying noise-sensitive digital circuitry with tight voltage tolerance and fast load transient response. Use Value: ±1.0% accuracy ensures reliable logic-level compliance; 72 dB ripple rejection suppresses switching noise from upstream DC/DC converters.	Use Scenario: Powering SATA interface circuitry and servo motor control logic in enterprise-grade 3.5" HDDs. IC Role / Device Role / Timing Role: Fixed-output LDO delivering stable 1.8 V to high-speed serial PHY layers requiring low-noise, low-drift supply. Use Value: No minimum load allows idle-state power savings; DPAK thermal performance sustains 1.0 A peak current during seek operations.
Switching Supply Post-Regulation	Battery Charger Reference Supply
Use Scenario: Downstream filtering stage after a 5 V buck converter powering USB-C PD controller ICs. IC Role / Device Role / Timing Role: Low-noise linear post-regulator improving PSRR and reducing output ripple to <10 mV_pp. Use Value: 1.2 V dropout enables operation with only 3.0 V input - minimizes power loss vs. higher-V_DO alternatives.	Use Scenario: Generating precise 1.8 V reference for battery fuel gauging ICs (e.g., MAX17048) in portable medical devices. IC Role / Device Role / Timing Role: Accuracy-critical voltage source feeding ADC reference inputs and analog comparators. Use Value: ±1.0% initial tolerance and 0.5% temperature stability ensure <±2% total error over −40°C to +85°C operating range.

Industrial Point-of-Load Regulation

Hard Drive Controller Power

Use Scenario: Providing clean 1.8 V rail to FPGA I/O banks or microcontroller core logic in factory automation PLCs.

IC Role / Device Role / Timing Role: Primary LDO regulator supplying noise-sensitive digital circuitry with tight voltage tolerance and fast load transient response.

Use Value: ±1.0% accuracy ensures reliable logic-level compliance; 72 dB ripple rejection suppresses switching noise from upstream DC/DC converters.

Use Scenario: Powering SATA interface circuitry and servo motor control logic in enterprise-grade 3.5" HDDs.

IC Role / Device Role / Timing Role: Fixed-output LDO delivering stable 1.8 V to high-speed serial PHY layers requiring low-noise, low-drift supply.

Use Value: No minimum load allows idle-state power savings; DPAK thermal performance sustains 1.0 A peak current during seek operations.

Switching Supply Post-Regulation

Battery Charger Reference Supply

Use Scenario: Downstream filtering stage after a 5 V buck converter powering USB-C PD controller ICs.

IC Role / Device Role / Timing Role: Low-noise linear post-regulator improving PSRR and reducing output ripple to <10 mV_pp.

Use Value: 1.2 V dropout enables operation with only 3.0 V input - minimizes power loss vs. higher-V_DO alternatives.

Use Scenario: Generating precise 1.8 V reference for battery fuel gauging ICs (e.g., MAX17048) in portable medical devices.

IC Role / Device Role / Timing Role: Accuracy-critical voltage source feeding ADC reference inputs and analog comparators.

Use Value: ±1.0% initial tolerance and 0.5% temperature stability ensure <±2% total error over −40°C to +85°C operating range.

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
TLV1117-18CDR	1.8 V fixed, 800 mA max, SOT-223 only, 1.2 V dropout at 800 mA, ±2% accuracy	Limited thermal capability (R_JA ≈ 160°C/W); unsuitable for >500 mA continuous in compact layouts	Select when board space is constrained and load current ≤500 mA; avoid for high-ambient or high-power-density designs
LD1117S18TR	1.8 V fixed, 800 mA max, SOT-223/DPAK, 1.3 V dropout at 800 mA, ±2% accuracy, no AEC-Q100 option	Higher dropout and looser tolerance reduce margin in low-input-voltage or precision applications	Acceptable for cost-sensitive consumer gear where 1.8 V ±2% and 3.1 V min input are acceptable

Compared with TLV1117-18CDR and LD1117S18TR, the NCP1117DT18T5 delivers tighter output accuracy (±1.0% vs. ±2%), higher current rating (1.0 A vs. 800 mA), and superior thermal performance in DPAK - making it preferred for industrial and automotive-qualified systems demanding robustness and precision.

Availability

NCP1117DT18T5 is available at Aetrix Electronics and suitable for industrial embedded systems, hard drive controllers, and switching power supply post-regulation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP1117DT18T5 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, sensors, and connectivity solutions for automotive, industrial, cloud, and IoT markets.

The NCP1117 series was designed for high-reliability point-of-load regulation in industrial and automotive environments - emphasizing low dropout, ±1.0% accuracy, thermal robustness, and AEC-Q100 qualification (NCV variant).

FAQ

What is the minimum input voltage required for stable operation of the NCP1117DT18T5?

The NCP1117DT18T5 requires a minimum input voltage of 3.2 V to maintain regulation across its full operating temperature range (−40°C to +125°C) and load range (0–800 mA), based on its 1.2 V maximum dropout specification. At 25°C and 10 mA load, the minimum input drops to 3.0 V, but design margins should use the worst-case 3.2 V value. Input voltage must never exceed 20 V absolute maximum.

Does the NCP1117DT18T5 require an external capacitor on the adjust pin?

No - the NCP1117DT18T5 is a fixed-output variant; it has no adjust pin. Only the adjustable versions (e.g., NCP1117DTAG) require C_adj. For NCP1117DT18T5, only input (C_in = 10 µF ceramic) and output (C_out = ≥4.7 µF, ESR 33 mΩ–2.2 Ω) capacitors are mandatory for stability and transient response.

Can the NCP1117DT18T5 be used in automotive applications?

The NCP1117DT18T5 is not AEC-Q100 qualified. For automotive use, select the NCV1117DT18T5G variant - identical pinout and electrical specs but manufactured under automotive-specific process controls and PPAP-capable. The "NCV" prefix denotes automotive qualification; "NCP" denotes commercial/industrial grade.

What is the thermal resistance (R_JA) of the NCP1117DT18T5 in a standard PCB layout?

With a minimum-size copper pad per datasheet Figure 22, the NCP1117DT18T5 (DPAK) has R_JA = 67°C/W. Using a 1-inch square 2.0 oz copper pour reduces R_JA to ~25°C/W. Actual R_JA depends heavily on PCB copper area, layer stack-up, and airflow - thermal simulation or testing is recommended for >0.5 W dissipation.

Is the heatsink tab of the NCP1117DT18T5 electrically isolated?

No - the exposed metal tab on the NCP1117DT18T5 is electrically connected to Pin 2 (Output). It must be routed to the same 1.8 V net and cannot be grounded or floated. This connection enables both thermal conduction and electrical integrity; isolation would compromise thermal performance and violate the device's internal construction.

NCP1117DT18T5 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

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):: 10 mA

Current - Supply (Max):: -

PSRR:: 70dB (120Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature

Operating Temperature:: 0°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

NCP1117DT18T5 FAQ

1.How can I place an order for NCP1117DT18T5 through Aetrix?

Please submit a Request for Quotation (RFQ) for NCP1117DT18T5 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 NCP1117DT18T5 reliable?

The price and inventory of NCP1117DT18T5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117DT18T5 is usually 5 days.

3.What payment methods are accepted for NCP1117DT18T5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117DT18T5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCP1117DT18T5?

NCP1117DT18T5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCP1117DT18T5 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 NCP1117DT18T5?

For technical support, including NCP1117DT18T5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117DT18T5 requirements.

6.How does Aetrix verify that NCP1117DT18T5 is sourced from the original manufacturer or authorized distributors?

All NCP1117DT18T5 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 NCP1117DT18T5 meets industry standards.

7.What is the process for return or replacement of NCP1117DT18T5?

All NCP1117DT18T5 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117DT18T5, 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 NCP1117DT18T5 part is unused and in its original packaging.

Return procedure for NCP1117DT18T5:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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