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Product Detailed Parameters
- Description：IC REG LINEAR 12V 100MA TO92-3
- Series：-
- Mfr：STMicroelectronics
- Package：Bulk
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：35V
- Voltage - Output (Min/Fixed)：12V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：-
- Current - Output：100mA
- Current - Quiescent (Iq)：6 mA
- Current - Supply (Max)：6.5 mA
- PSRR：42dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature, Short Circuit
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Through Hole
- Package / Case：TO-226-3, TO-92-3 (TO-226AA)
- Supplier Device Package：TO-92-3
- Grade：-
- Qualification：-
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Overview
The L78L12ABZ is a three-terminal positive linear voltage regulator from the STMicroelectronics L78L series, housed in a TO-92 package. It provides a fixed output voltage of 12 V with an output current capability up to 100 mA. The device supports a maximum input voltage of 35 V and operates within a junction temperature range of -40 °C to +125 °C. Electrical characteristics include a typical quiescent current of 6.5 mA at 25 °C, line regulation of 200 mV (VI = 16 to 27 V), and load regulation of 100 mV (IO = 1 to 100 mA).
Feature Summary
- Integrates internal thermal overload protection and short-circuit protection for robust operation.
- Designed as a fixed voltage regulator requiring no external components for basic functionality.
- Offers improved performance over Zener diode/resistor combinations with lower noise.
Applications
- Local or on-card regulation to eliminate noise associated with single-point regulation.
- Replacement for Zener diode/resistor combinations in power supply circuits.
- Configuration with external power pass elements to create high-current voltage regulators.
Procurement Notes
Verify that the specific part number matches the required 'A' tolerance selection, which corresponds to ±4% output voltage accuracy. Confirm the TO-92 through-hole package format aligns with the target PCB layout. Ensure the application environment remains within the specified -40 °C to +125 °C operating temperature range to maintain electrical specifications.
Selection Notes
Select this component when a fixed 12 V output is required with moderate current demands up to 100 mA. The 'AB' suffix indicates extended industrial temperature coverage compared to standard variants. Consider the thermal resistance characteristics of the TO-92 package and ensure adequate heat dissipation if the input-output voltage differential results in significant power dissipation.
Part Context
This device belongs to the L78Lxx family of low-power positive voltage regulators. The L78L series is distinguished by its compact form factor and suitability for applications where space is limited but higher currents than LDOs are needed. The L78L12 variant specifically targets 12 V distribution systems in consumer and industrial electronics.
FAQ
What is the output voltage tolerance for the L78L12ABZ?
The 'A' designation in the part number indicates a ±4% output voltage tolerance.
Does the L78L12ABZ require external capacitors for stability?
No external components are strictly required for basic operation, though typical application circuits often include input and output capacitors for transient response and ripple rejection improvement.
