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Product Detailed Parameters
- Description：IC REG LIN 3.3V 150MA TSOT-23-5
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：6V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.1V @ 150mA
- Current - Output：150mA
- Current - Quiescent (Iq)：150 µA
- Current - Supply (Max)：250 µA
- PSRR：60dB ~ 50dB (1kHz ~ 10kHz)
- Control Features：Enable
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：SOT-23-5 Thin, TSOT-23-5
- Supplier Device Package：TSOT-23-5
- Grade：-
- Qualification：-
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Overview
The LD3985G33R is a fixed-output low dropout (LDO) voltage regulator manufactured by STMicroelectronics. It provides a stable 3.3 V output with a maximum load current of 550 mA. The device features a TSOT-23 surface-mount package with five pins and dimensions of 2.9 x 1.6 x 1 mm. Electrical specifications include a line regulation of 0.1 %/V, load regulation of 0.005 %/mA, and an output accuracy of ±2%. Operating parameters cover a minimum input voltage of 2.5 V and a maximum input voltage of 6 V. Quiescent current is specified at 0.17 mA. The component operates within a temperature range of -40 °C to +125 °C.
Feature Summary
- Provides a fixed 3.3 V regulated output suitable for powering digital logic circuits.
Applications
Procurement Notes
Verify the specific part number LD3985G33R against official STMicroelectronics documentation to confirm pinout compatibility and thermal characteristics. Ensure that the selected supplier provides traceable components matching the stated electrical tolerances and package dimensions. Cross-reference datasheet revisions to validate performance metrics under varying load conditions.
Selection Notes
Select this component when a compact, fixed 3.3 V supply is required for low-power applications. The TSOT-23 package offers space efficiency for dense PCB layouts. Verify that the input voltage remains within the 2.5 V to 6 V range to ensure proper regulation and prevent excessive power dissipation or dropout.
Part Context
This LDO regulator belongs to STMicroelectronics' portfolio of low-dropout voltage regulators designed for portable electronics. The LD3985 series utilizes a P-channel pass element to achieve low quiescent current consumption. The G33 suffix indicates the fixed 3.3 V output variant, while the R suffix typically denotes reel packaging configuration.
Replacement Considerations
Consult official STMicroelectronics substitution guides for verified equivalents. Generic replacements may differ in dropout voltage, thermal resistance, or package footprint. Validate any alternative component against the original specifications before implementation.
