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NCP1117DT33RKG

1A LDO, 3.3V fixed, 1.2V dropout, 20V max input, DPAK, onsemi NCP1117 series

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Manufacturer Part：

NCP1117DT33RKG

Package：

DPAK (DT, 6.5 x 5.5 x 2.3mm)

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Description

Product Overview

The onsemi NCP1117DT33RKG is a 1A low-dropout (LDO) linear voltage regulator providing a fixed 3.3V output. With a maximum dropout voltage of 1.2V at 800mA, it can operate from input voltages up to 20V. The DPAK package provides excellent thermal performance for applications requiring moderate output current.

Key Specifications

Output Voltage 3.3V (fixed)
Maximum Output Current 1A
Dropout Voltage 1.2V max at 800mA
Input Voltage Range 4.5V to 20V
Output Accuracy ±1.0%
Quiescent Current 5mA (typical)
Current Limiting Yes
Thermal Shutdown Yes (150°C)
Package DPAK (DT)
Operating Temperature -40°C to +125°C

Features

  • 1A output current
  • 3.3V fixed output with ±1% accuracy
  • Low dropout: 1.2V at 800mA
  • No minimum load requirement
  • Internal current limiting and thermal shutdown
  • Direct replacement for LM1117
  • DPAK package for good thermal dissipation

Applications

  • 3.3V logic power supply from 5V
  • Post-regulation for switch-mode supplies
  • Battery-powered devices
  • Consumer electronics
  • Industrial control systems

The onsemi NCP1117DT33RKG is a 1A LDO linear regulator providing a fixed 3.3V output with ±1% accuracy. As a direct replacement for the industry-standard LM1117, it features low dropout voltage (1.2V max at 800mA), internal current limiting, and thermal shutdown protection. The DPAK package provides good thermal dissipation for the 1A output current capability.

The NCP1117DT33RKG uses a PNP pass transistor in a low-dropout configuration, allowing the output voltage to be maintained with only 1.2V of headroom at 800mA load. The internal bandgap reference provides the ±1% output voltage accuracy. On-chip trimming during manufacturing ensures the output voltage is within specification. The current limiting circuit protects against output short circuits, while the thermal shutdown activates at approximately 150°C junction temperature to prevent damage.

Pin Name Type Function
1 GND Ground Ground and thermal pad
2 VOUT Output 3.3V regulated output
3 VIN Input Input supply (4.5-20V)
  • 3.3V logic supply from 5V USB power
  • Switch-mode supply post-regulation
  • Battery-powered device 3.3V rail
  • Consumer electronics power management
  • Industrial controller 3.3V supply
Manufacturer Part Number Package Notes
TI LM1117MP-3.3/NOPB SOT-223 Industry standard equivalent
onsemi NCP1117ST33T3G SOT-223 Same function, SOT-223 pkg
Microchip MCP1827-3302E/DB SOT-223 Low Iq alternative
Diodes Inc AZ1117EH-3.3TRG1 SOT-223 Cost-effective alternative
onsemi NCP1117DT50RKG DPAK 5.0V version
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Contact Information

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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