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STMicroelectronics L78M05ABDT-TR
__2.jpg "L78M05ABDT-TR")
- Part No.:
- L78M05ABDT-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Description:
- IC REG LINEAR 5V 500MA DPAK
- Quantity:
Unit Price:$0
Ext Price:$0
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- Shipping:
Product Details
L78M05ABDT-TR - 5 V, 500 mA Precision Regulator
STMicroelectronics L78M05ABDT-TR is a fixed 5 V positive linear regulator with 2 percent tolerance, supplied in the surface-mount DPAK package.
Electrical limits, pin connections, package details, and exact orderable status were checked against the official ST L78M Rev. 24 datasheet and current L78M product page.
Overview
L78M05ABDT-TR provides local 5 V regulation for loads up to 500 mA when adequate heat sinking and input headroom are available. Internal current limiting, thermal shutdown, short-circuit protection, and output-transistor safe-area protection support robust operation.
Key Advantages
Precision 5 V output
The AB grade provides a nominal 5 V output with 2 percent tolerance at 25 degrees C.
Medium-current capability
Up to 500 mA is available when the device remains within its thermal and safe-area limits.
Integrated protection
Current limiting, thermal overload shutdown, short-circuit response, and safe-area protection are built in.
Simple application
Only small input and output bypass capacitors are needed in the standard fixed-regulator circuit.
Feature Summary
Extended temperature grade
The AB version is characterized from -40 degrees C to +125 degrees C junction temperature.
Good supply rejection
The 5 V version specifies at least 62 dB rejection at 120 Hz under the stated condition.
Low output noise
Typical output noise is 40 microvolts over the 10 Hz to 100 kHz bandwidth.
Surface-mount power package
DPAK provides a large grounded tab for electrical connection and heat spreading.
Package & Footprint
ST specifies the exact orderable in DPAK, also known as TO-252 and SC-63. The catalog description, TO-252-3 with two formed leads plus tab, is consistent with the manufacturer's DPAK drawing. Use the current ST outline and recommended footprint for board dimensions.
- Follow the ST top-view pin diagram and current DPAK land pattern.
- Connect the center ground lead and exposed tab to the ground copper area.
- Place bypass capacitors close to INPUT, OUTPUT, and GROUND.
- Size the copper area for the required thermal resistance and ambient condition.
The registered JPG is checked locally and at the production URL before publication.
Pin Functions
The DPAK connection follows the official ST top-view diagram.
The tab is not an isolated thermal pad. Confirm its ground connection before routing the footprint.
Key Specifications
| Manufacturer | STMicroelectronics |
|---|---|
| Regulator type | Fixed positive linear regulator |
| Nominal output | 5 V |
| Output current | Up to 500 mA with adequate thermal design |
| Output at 25 degrees C | 4.9 V minimum, 5.0 V typical, 5.1 V maximum |
| Output over operating test range | 4.8 V minimum to 5.2 V maximum at 5 mA to 350 mA and 7 V to 20 V input |
| Dropout voltage | 2 V typical at 25 degrees C |
| Quiescent current | 6 mA maximum at 25 degrees C |
| Line regulation | 100 mV maximum from 7 V to 25 V at 200 mA and 25 degrees C |
| Load regulation | 100 mV maximum from 5 mA to 500 mA at 25 degrees C |
| Supply rejection | 62 dB minimum at 120 Hz under the stated condition |
| Output noise | 40 microvolts typical, 10 Hz to 100 kHz |
| Operating junction temperature | -40 degrees C to +125 degrees C for AB grade |
| Protection | Thermal overload, short circuit, current limiting, and output-transistor safe-area protection |
| Package and finish | DPAK / TO-252 / SC-63; industrial grade; Ecopack2; tape and reel |
Typical values are not guaranteed limits. Apply the exact test conditions, absolute ratings, and thermal derating guidance in the current ST datasheet.
Replacement Considerations
A replacement must match the fixed 5 V output, 500 mA requirement, INPUT/GROUND/OUTPUT connection order, grounded tab, dropout, tolerance grade, quiescent current, protection behavior, temperature range, and DPAK footprint. Lower-dropout regulators may require different capacitors and are not automatically interchangeable.
No internal replacement link is asserted without an exact API-confirmed catalog match and engineering review.
Manufacturer Information
STMicroelectronics lists the exact L78M05ABDT-TR orderable as active and in volume production. It is the industrial, Ecopack2-compliant DPAK AB-grade 5 V version supplied on tape and reel. This exact orderable status is distinct from older base-device pages that may be archived.
Applications
Local board regulation
Create a stable 5 V rail near digital, interface, and control loads.
Industrial controls
Supply logic and sensor circuitry across the extended temperature range.
Post-regulation
Reduce upstream ripple where the required input headroom and dissipation are acceptable.
Power conversion
Use the protected fixed regulator in auxiliary supplies and general-purpose equipment.
Quality & Authenticity
Verify the complete L78M05ABDT-TR order code, ST marking, DPAK dimensions, grounded tab, reel label, Ecopack declaration, and lot traceability during incoming inspection. Package appearance alone does not establish authenticity.
FAQ
What output does L78M05ABDT-TR provide?
It is the AB-grade fixed 5 V member of the 500 mA L78M family.
Is this a low-dropout regulator?
No. The datasheet gives approximately 2 V typical dropout, so the input must remain sufficiently above 5 V.
What are the DPAK connections?
Pin 1 is INPUT, pin 2 and the tab are GROUND, and pin 3 is OUTPUT.
Are external capacitors needed?
The standard test and application circuit uses 0.33 microfarad at the input and 0.1 microfarad at the output.
Can it continuously deliver 500 mA?
Only when input voltage, junction temperature, board copper, airflow, and safe-area limits permit the resulting dissipation.
Engineering Notice
Calculate worst-case dissipation from input voltage, load current, and quiescent current; then verify junction temperature with the actual DPAK copper area. Maintain input headroom, observe the 35 V absolute input limit, and confirm transient conditions in the final circuit.
L78M05ABDT-TR Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 62dB (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:
- DPAK
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