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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 100MA 8-SOIC
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：30V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：-
- Current - Output：100mA
- Current - Quiescent (Iq)：5.5 mA
- Current - Supply (Max)：6 mA
- PSRR：49dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature, Short Circuit
- Operating Temperature：0°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：8-SOIC
- Grade：-
- Qualification：-
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Overview
The L78L33ACD13TR is a fixed positive linear voltage regulator from the STMicroelectronics L78L series, housed in an SO-8 surface-mount package. It provides a nominal output voltage of 3.3 V with a maximum continuous output current of 100 mA. The device accepts input voltages up to 30 V and operates within a junction temperature range of 0 °C to 125 °C. Electrical specifications include a typical quiescent current of 6 mA, line regulation of 150 mV, load regulation of 60 mV, and a typical supply voltage rejection ratio of 49 dB at 120 Hz.
Feature Summary
- Integrated thermal overload protection and short-circuit protection for robust operation
- Requires no external components for basic fixed-voltage regulation applications
- Available in ±4% output voltage tolerance selection (indicated by 'A' suffix)
- Designed as a replacement for Zener diode/resistor combinations with lower noise
Applications
- Local or on-card voltage regulation
- Elimination of noise and distribution problems associated with single-point regulation
- Replacement for Zener diode and resistor combinations
- Configuration with power pass elements to create high-current regulators
Procurement Notes
Verify that the specific ordering suffix matches the required package type and electrical tolerance. Confirm that the 'A' designation aligns with the necessary ±4% output voltage accuracy. Ensure the SO-8 surface-mount format is compatible with the intended PCB footprint and assembly process before finalizing procurement.
Selection Notes
Select this component when a fixed 3.3 V output is required with a maximum load current of 100 mA. The SO-8 package is suitable for space-constrained surface-mount designs. Verify that the input voltage remains within the 30 V absolute maximum rating and that the operating environment stays within the specified 0 °C to 125 °C temperature range.
Part Context
This part belongs to the L78Lxx family of three-terminal positive regulators manufactured by STMicroelectronics. The series utilizes internal current limiting and thermal shutdown mechanisms. The L78L33 variant specifically targets 3.3 V applications, offering improved performance over discrete Zener-based solutions with reduced quiescent current and noise characteristics.
Replacement Considerations
Direct pin-compatible replacements within the same manufacturer's portfolio include L78L33CD13TR (±8% tolerance) and L78L33ABD13TR (-40 °C to 125 °C operating range). Cross-manufacturer equivalents may require verification of pinout compatibility and thermal resistance specifications.
