onsemi NCP1117DT25RKG

Overview

NCP1117DT25RKG from onsemi is a 2.5 V fixed-output, 1.0 A low-dropout linear voltage regulator in DPAK (TO-252) package. It delivers ±1.0% output voltage accuracy, supports up to 20 V input, maintains regulation with no minimum load, and features thermal shutdown, current limiting, and safe operating area protection. It is used for point-of-load regulation in industrial controllers and hard drive power supplies.

For engineers reviewing the NCP1117DT25RKG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 800 mA (≤1.2 V), thermal resistance (R_JA = 67 °C/W), output stability with ≥4.7 µF output capacitance, and compatibility with standard PCB copper heatsinking per Figure 22.

Technical Context

The NCP1117DT25RKG uses an internal bandgap reference trimmed to ±1.0% and a PNP pass transistor architecture enabling low dropout performance. Its control loop is internally compensated and requires only a single 4.7 µF–10 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for stability.

It operates across 0°C to +125°C ambient temperature, supports input voltages from 3.9 V to 10 V for full 0–800 mA load range, and provides 64 dB ripple rejection at 120 Hz with 5 V output. Internal protection includes foldback current limiting and thermal shutdown activation at ~175°C junction temperature.

Key Specifications

Pinout & Package

DPAK (TO-252) package with exposed metal tab thermally and electrically connected to Pin 2 (Output). Standard 3-pin surface-mount outline (Case 369C), 6.10 mm × 6.54 mm footprint, 2.28 mm height.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO regulator applications.

Compared with MIC29302-2.5WT and TLV1117-25CDR, the NCP1117DT25RKG offers optimal balance of 1.0 A capability, DPAK thermal performance (R_JA = 67 °C/W), and ±1.0% accuracy-making it preferred for industrial SMT designs requiring robust, medium-current 2.5 V regulation.

Availability

NCP1117DT25RKG is available at Aetrix Electronics and suitable for industrial sensor nodes, hard drive controllers, and consumer point-of-regulation applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP1117DT25RKG 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, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The NCP1117 series was designed for cost-effective, reliable point-of-load regulation in consumer, industrial, and computing equipment-emphasizing low dropout, high accuracy, and integrated protection without external components.

FAQ

What is the maximum input voltage for NCP1117DT25RKG?

The absolute maximum input voltage for NCP1117DT25RKG is 20 V. However, for guaranteed 1.0 A output across the full temperature range, the input must remain ≤10 V when delivering 800 mA. At inputs >12 V, output current must be limited to ≤1.0 A per datasheet Note 3. Operation at 20 V is permissible only at reduced load or elevated ambient temperatures with appropriate thermal design.

Does NCP1117DT25RKG require an output capacitor, and what type is recommended?

Yes, NCP1117DT25RKG requires a minimum 4.7 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for loop stability. Ceramic, tantalum, or aluminum electrolytic capacitors meeting these specifications are acceptable. A 10 µF X7R ceramic capacitor is commonly used and provides excellent transient response and low noise for the NCP1117DT25RKG.

Is NCP1117DT25RKG pin-compatible with older regulators like LM317?

No-NCP1117DT25RKG is a fixed-output device with Ground/Adjust (Pin 1), Output (Pin 2), and Input (Pin 3) pinout. The LM317 is adjustable and uses Adjust (Pin 1), Output (Pin 2), and Input (Pin 3), making it incompatible. However, the NCP1117DT25RKG is pin-compatible with other NCP1117 fixed-output variants in DPAK (e.g., NCP1117DT33RKG), enabling drop-in voltage replacement within the same family.

What thermal considerations apply to NCP1117DT25RKG in DPAK package?

NCP1117DT25RKG in DPAK has R_JA = 67 °C/W with minimum PCB pad and R_JC = 6.0 °C/W. To avoid thermal shutdown, ensure junction temperature stays below 150°C. For example, at 800 mA and 1.2 V dropout (0.96 W dissipation), 50°C ambient requires ≤104°C rise - achievable with ≥250 mm² of 2 oz. copper connected to the tab. Refer to Figure 22 for copper length vs. R_JA.

Can NCP1117DT25RKG be used in automotive applications?

The NCP1117DT25RKG is not AEC-Q100 qualified. For automotive use, select the NCV1117DT25RKG variant (NCV prefix), which is AEC-Q100 Grade 1 qualified (−40°C to +125°C), PPAP-capable, and manufactured under automotive-specific process controls. The NCP1117DT25RKG is intended for industrial and consumer applications only.