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Product Detailed Parameters
- Description：IC REG LINEAR 9V 100MA SOT89-3
- 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)：9V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：-
- Current - Output：100mA
- Current - Quiescent (Iq)：5.5 mA
- Current - Supply (Max)：6 mA
- PSRR：44dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature, Short Circuit
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：TO-243AA
- Supplier Device Package：SOT-89-3
- Grade：-
- Qualification：-
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Overview
The L78L09ABUTR is a three-terminal positive linear voltage regulator from the STMicroelectronics L78L series, housed in an SOT-89 surface-mount package. It provides a fixed output voltage of 9 V with a maximum output current of 100 mA. The device supports a DC input voltage range up to 30 V and operates within a junction temperature range of -40 °C to +125 °C. Electrical characteristics include a typical quiescent current of 6 mA at 25 °C, line regulation of 225 mV (VI = 11.5 to 23 V), load regulation of 80 mV (IO = 1 to 100 mA), and a typical supply voltage rejection ratio of 44 dB at 120 Hz.
Feature Summary
- Integrates internal current limiting and thermal shutdown protection mechanisms for robust operation under fault conditions.
- Functions as a fixed-voltage regulator requiring no external components for basic configuration.
- Offers improved performance over Zener diode/resistor combinations with lower quiescent current and reduced noise.
Applications
- Local or on-card voltage regulation to eliminate noise associated with single-point distribution.
- Replacement for Zener diode and resistor voltage reference combinations.
- Configuration with power pass elements to construct high-current voltage regulators.
Procurement Notes
Verify that the component matches the specific 'A' tolerance grade and SOT-89 surface-mount packaging required for the design. Confirm the manufacturer is STMicroelectronics and check datasheet revision DS0424 Rev 30 for updated electrical limits. Ensure environmental compliance requirements align with ECOPACK specifications provided by the supplier.
Selection Notes
Select this part when a fixed 9 V output is needed with currents up to 100 mA in a compact surface-mount form factor. The 'AB' suffix indicates extended temperature capability down to -40 °C compared to standard variants. Consider the SOT-89 package thermal resistance if operating near maximum current limits without adequate board heat-sinking.
Part Context
This component belongs to the L78Lxx family of three-terminal positive regulators manufactured by STMicroelectronics. The series includes various fixed output voltages ranging from 3.3 V to 24 V. The L78L09 variant specifically targets applications requiring a stable 9 V rail. The 'AB' designation denotes the tighter ±4% output voltage tolerance and extended low-temperature operational range.
Replacement Considerations
Datasheets for other manufacturers list the UA78L09ACPK as a similar replacement option. Verify pinout compatibility and thermal performance before substitution.
