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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：-40°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 L78L33ABD-TR is a three-terminal positive linear voltage regulator from the STMicroelectronics L78L series, housed in an SO-8 surface-mount package. It provides a fixed output voltage of 3.3 V with a maximum output current of 100 mA. The device features ±4% output voltage tolerance and operates within a junction temperature range of -40 °C to 125 °C. Maximum input voltage is rated at 30 V for this output level. Internal protections include thermal shutdown and short-circuit protection.
Feature Summary
- Integrated internal current limiting and thermal shutdown mechanisms ensure robust operation under fault conditions.
- Designed as a fixed-voltage regulator requiring no external components for basic functionality.
- Suitable for local on-card regulation to eliminate noise and distribution issues associated with single-point regulation.
Applications
- Local or on-card voltage regulation
- Replacement for Zener diode/resistor combinations
- Battery-powered systems
Procurement Notes
Verify that the specific ordering suffix matches the required package type (SO-8) and temperature grade (AB). Confirm the manufacturer part number against official STMicroelectronics documentation to ensure correct electrical characteristics and pin configuration before integration into the design.
Selection Notes
Select this component when a fixed 3.3 V supply is needed with up to 100 mA load capability in a compact surface-mount form factor. The AB designation indicates extended temperature coverage down to -40 °C and tighter voltage tolerance compared to standard C-grade variants.
Part Context
This device belongs to the L78Lxx family of low-power three-terminal positive regulators. The family offers various fixed output voltages and packages including TO-92, SOT-89, and SO-8. The L78L series is designed for applications requiring simple, reliable voltage regulation without complex external circuitry.
FAQ
What is the difference between the L78L33AB and L78L33AC versions?
The 'AB' version guarantees operation over an extended temperature range of -40 °C to 125 °C and offers ±4% output voltage tolerance. The 'AC' version operates from 0 °C to 125 °C with ±8% tolerance.
Does the L78L33ABD-TR require external capacitors?
While the datasheet states no external components are strictly required for basic function, typical application circuits often include input and output capacitors (e.g., 0.33 µF and 0.1 µF) to ensure stability and improve transient response.
