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Manufacturer Part #


LD1085 Series 3 A 3.3 V Fixed Output Positive Voltage LDO Regulator - D2PAK

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Mfr. Name: STMicroelectronics
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Product Specification Section
Technical Attributes
Attributes Table
Input Voltage-Max: 30V
Dropout Voltage-Max: 1.5V
Output Current-Max: 3A
Package Style:  TO-263-3 (D2PAK)
Mounting Method: Surface Mount
Features & Applications
The LD1085D2T33R is a low drop voltage regulator able to provide up to 3 A of output current. Dropout is guaranteed at a maximum of 1.2 V at the maximum output current, decreasing at lower loads. The LD1085xx is pin to pin compatible with the older 3-terminal adjustable regulators, but has better performances in term of drop and output tolerance.

A 2.85 V output version is suitable for SCSI-2 active termination. Unlike PNP regulators, where a part of the output current is wasted as quiescent current, the LD1085xx quiescent current flows into the load, so increase efficiency. Only a 10 μF minimum capacitor is need for stability. The device is supplied in TO-220, TO-220FP,DPAK, D2PAK and D2PAK/A. On chip trimming allows the regulator to reach a very tight output voltage tolerance, within ± 1 % at 25 °C.


  • Typical dropout 1.3 V (at 3 A)
  • Three terminal adjustable or fixed output voltage 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V, 12 V.
  • Automotive grade product: adjustable VOUT only in TO-220 full pack package
  • Guaranteed output current up to 3 A
  • Output tolerance ± 1 % at 25°C and ± 2 % in full temperature range
  • Internal power and thermal limit
  • Wide operating temperature range -40 °C to 125 °C
  • Package available: TO-220, TO-220FP, DPAK, D2PAK, D2PAK/A
  • Pinout compatibility with standard adjustable VREG

View the Complete family of LD1085 Linear Regulators

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