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Manufacturer Part #


SPX3940 Series 3.3 V Fixed Output 1 A SMT LDO Voltage Regulator - TO-263 T/R

Mfr. Name: MaxLinear
Standard Pkg:
Date Code: 1739
Product Specification Section
Technical Attributes
Attributes Table
Input Voltage-Max: 16V
Output Voltage Fixed: 3.3V
Dropout Voltage-Max: 0.55V
Output Current-Max: 1A
Tolerance (%): ±1%
Operating Temp Range: -40°C to +125°C
Regulator Topology: Fixed
Quiescent Current: 12mA
No. of Outputs: Single
Output Noise: 260µV
Load Regulation (%): 0.3%
Current - Limit: 2.2A
Line Regulation (%): 0.2%
Package Style:  TO-263-3 (D2PAK)
Mounting Method: Surface Mount
Features & Applications
The SPX3940AT-L-3-3/TRis a 1 A accurate voltage regulator with a low drop out voltage of 280 mV. It isavailable in 3 pin TO-263 package.

This device is specially designed for low voltage applications that require alow dropout voltage and a fat transient response. It is fully fault protectedagainst over-current, reverse battery and positive and negative voltagetransients.


  • Guaranteed 1.5 A peak current
  • 1% output accuracy SPX3940A
  • Low quiescent current
  • Low dropout voltage of 280 mA at 1A
  • Extremely tight load and line regulation
  • Extremely fast transient response
  • Reverse-battery protection
  • Internal thermal protection
  • Internal short circuit current limit
  • Replacement for LM3940
  • Standard TO-263 package


  • Power supplies
  • LCD monitors
  • Portable instrumentation
  • Medical and industrial equipments
Pricing Section
Web Price:
$2.04 USD Each
Cost Per Unit
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Tariff charges may apply if shipping to the United States. An estimate of tariff charges will be calculated at checkout.

$7.00 reeling fee is amortized over the number of components for each reel.
Mini-Reels are a custom product and are non-cancelable and non-returnable.