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Manufacturer Part #


LFXX Series 500 mA 3.3 V Fixed VLDO Voltage Regulator with Inhibit - PPAK-5

Mfr. Name: STMicroelectronics
Standard Pkg:
Product Variant Information section
Date Code: 1652
Product Specification Section
Technical Attributes
Attributes Table
Input Voltage-Max: 16V
Output Voltage Fixed: 3.3V
Dropout Voltage-Max: 0.7V
Output Current-Max: 500mA
Tolerance (%): ±2%
Operating Temp Range: -40°C to +125°C
Regulator Topology: Fixed
Quiescent Current: 0.5mA
No. of Outputs: Single
Output Noise: 50µV
Load Regulation: 3mV
Current - Limit: 1A
Line Regulation: 3mV
Package Style:  POWERPAK-5
Mounting Method: Surface Mount
Features & Applications
The LF33CPT-TR is a very low drop regulators available in PENTAWATT, TO-220, TO-220FP, DPAK and PPAK package and in a wide range of output voltages. The very low drop voltage (0.45 V) and the very low quiescent current make them particularly suitable for low noise, low power applications and specially in battery powered systems.

In the 5 pins configuration (PENTAWATT and PPAK) a shutdown logic control function is available (pin 2, TTL compatible). This means that when the device is used as a local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. In the three terminal configuration the device has the same electrical performance, but is fixed in the ON state. It requires only a 2.2 μF capacitor for stability allowing space and cost saving.


  • Very low dropout voltage (0.45 V)
  • Very low quiescent current (typ. 50 μA in OFF mode, 500 μA in ON mode)
  • Output current up to 500 mA
  • Logic-controlled electronic shutdown
  • Output voltages of 1.5; 1.8; 2.5; 3.3; 4.7; 5; 6; 8; 8.5; 9; 12 V
  • Automotive Grade product: 1.8 V, 2.5 V, 3.3 V, 5.0 V, 8.0 V, 8.5 V VOUT in DPAK and PPAK packages
  • Internal current and thermal limit
  • Only 2.2 μF for stability
  • Available in ± 1% (AB) or ± 2% (C) selection at 25 °C
  • Supply voltage rejection: 80 db (typ.)
  • Temperature range: -40 to 125 °C
Pricing Section
Minimum Order:
Multiple Of:
On Order:
Factory Stock:Factory Stock:
Factory Lead Time:
6 Weeks
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Product Variant Information section