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STMicroelectronics L78L33ABUTR
- Part No.:
- L78L33ABUTR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-243AA
- Description:
- IC REG LINEAR 3.3V 100MA SOT89-3
- Quantity:
Unit Price:$0
Ext Price:$0
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Product Details
L78L33ABUTR - 3.3 V, 100 mA Positive Voltage Regulator
STMicroelectronics L78L33ABUTR is a fixed 3.3 V three-terminal positive linear regulator in a SOT-89 package, with output capability up to 100 mA when thermal conditions permit.
Electrical characteristics, pin assignment, package, marking, and ordering status were checked against ST data sheet DS0424 Rev. 30 and the exact manufacturer listing.
Overview
The L78L33ABUTR provides a nominal 3.3 V regulated output for local or on-card power rails. Internal current limiting, short-circuit protection, and thermal shutdown simplify implementation. The AB selection covers a -40 degrees C to +125 degrees C operating junction range and the tighter A-grade output selection.
Key Advantages
Fixed 3.3 V rail
No feedback divider is required for the nominal output voltage.
Three-terminal simplicity
Only input, ground, and output connections are required for the regulator itself.
Integrated protection
Internal current limiting, short-circuit protection, and thermal shutdown improve fault tolerance.
Industrial temperature range
The AB grade is specified from -40 degrees C to +125 degrees C junction temperature.
Feature Summary
Up to 100 mA
The family supports output current to 100 mA with adequate heat sinking.
A-grade selection
The 3.3 V AB device is specified at 3.168 V to 3.432 V at 25 degrees C.
Low-noise regulation
Typical output-noise voltage is 40 microvolts over 10 Hz to 100 kHz.
SOT-89 implementation
The compact surface-mount package can use board copper as a heat spreader.
Package & Footprint
ST specifies L78L33ABUTR in the three-lead SOT-89 package. The catalog designation TO-243AA is a registered mechanical alias for this package family.
- Use the current ST SOT-89 footprint and verify top-view pin orientation.
- Provide sufficient copper area when higher dissipation is expected.
- Place bypass capacitors close to input, output, and ground.
- Calculate junction temperature from input voltage, load current, ambient, and board thermal design.
The registered JPG is present locally and is checked in production before publication.
Pin Functions
The SOT-89 assignment below is the top view shown by ST.
Do not assume pin compatibility from package appearance; verify the exact L78L SOT-89 drawing before PCB release.
Key Specifications
| Manufacturer | STMicroelectronics |
|---|---|
| Regulator type | Fixed positive linear voltage regulator |
| Nominal output | 3.3 V |
| Output at 25 degrees C | 3.168 V minimum, 3.3 V typical, 3.432 V maximum |
| Output over stated line and load conditions | 3.135 V minimum, 3.465 V maximum |
| Output current | Up to 100 mA with adequate thermal design |
| Maximum DC input rating | 30 V for 3.3 V to 9 V variants |
| Dropout voltage | 2 V typical under the stated data-sheet condition |
| Quiescent current | 6 mA maximum at 25 degrees C |
| Load regulation | 60 mV maximum from 1 mA to 100 mA at 25 degrees C |
| Output noise | 40 microvolts typical, 10 Hz to 100 kHz |
| Supply rejection | 41 dB minimum, 49 dB typical at 120 Hz under the stated condition |
| Operating junction temperature | -40 degrees C to +125 degrees C |
| Package | SOT-89, catalog alias TO-243AA; tape-and-reel |
Limits depend on the stated test circuit and temperature. ST's table uses 0.33 microfarad input and 0.1 microfarad output capacitors.
Replacement Considerations
A replacement must preserve the fixed 3.3 V output, required load current, SOT-89 footprint, VOUT/GND/VIN pin order, input rating, dropout, stability, protection, and temperature range. Other L78L voltages and package variants are not direct substitutes without electrical and mechanical review.
No internal replacement link is asserted without an exact API-confirmed catalog match and engineering review.
Manufacturer Information
STMicroelectronics lists L78L33ABUTR as an active industrial product. L78L33 identifies the 3.3 V family member, AB identifies the -40 degrees C to +125 degrees C A-selection device, U identifies SOT-89, and TR identifies tape-and-reel packaging. The documented marking is 8A.
Applications
Local regulation
Create a 3.3 V rail close to a load to reduce distribution-related noise and voltage variation.
Control electronics
Supply low-current controllers, interfaces, and analog support circuits.
Zener replacement
Replace a Zener-resistor regulator where improved regulation and lower noise are needed.
Current-boosted regulators
The family can drive external pass-element circuits when a separately engineered higher-current solution is required.
Quality & Authenticity
Confirm the exact L78L33ABUTR order code, 8A marking, reel label, SOT-89 dimensions, lead finish, and lot traceability during incoming inspection. Package appearance alone does not establish authenticity. Electrical verification should use the latest ST limits and test circuit.
FAQ
What output voltage does L78L33ABUTR provide?
It is the fixed 3.3 V member of the L78L positive-regulator family.
Can it continuously supply 100 mA?
Only when input headroom, power dissipation, board copper, ambient temperature, and junction temperature permit.
What is the pin order?
For the SOT-89 top view, pin 1 is VOUT, pin 2 is GND, and pin 3 is VIN.
What capacitors are used in the test circuit?
ST specifies 0.33 microfarad at the input and 0.1 microfarad at the output for the electrical-characteristic tests.
What does AB mean?
It denotes the tighter A-selection regulator characterized over -40 degrees C to +125 degrees C.
Engineering Notice
Validate minimum input voltage, dropout headroom, startup and load transients, capacitor placement, and junction temperature in the final circuit. Power dissipation rises with (VIN minus 3.3 V) multiplied by load current, so the thermal limit can dominate well below the absolute input rating.
L78L33ABUTR Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
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