L78M05TL-TL-E Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The L78M05TL-TL-E is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V output at 500mA. This device features integrated over-current and over-temperature protection, making it suitable for general-purpose power management applications. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and maintenance requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	L78M05TL-TL-E
Manufacturer	onsemi
Category	Power Management (PMIC)
Product Status	Obsolete
Output Voltage (Fixed)	5V
Output Current	500mA
Input Voltage (Max)	20V
Voltage Dropout (Max)	2V @ 350mA
Operating Temperature Range	-20°C ~ 80°C
Protection Features	Over Current, Over Temperature
PSRR	80dB (120Hz)
RoHS Status	ROHS3 Compliant
Packaging	Cut Tape (CT)

Substitute Part Grouping Explanation

Substitution eligibility for the L78M05TL-TL-E is determined by the following critical parameters:

Fixed output voltage of 5V
Output current capability of 500mA minimum
Positive output configuration
Single regulator topology
Over-current and over-temperature protection features
ROHS3 compliance and REACH unaffected status
Input voltage tolerance (minimum 20V maximum rating)

The four identified substitute parts meet these core electrical requirements while offering enhanced specifications in certain areas. Substitutes are grouped by mounting type and package configuration, which may require PCB layout modifications depending on the application design.

Parameter Comparison

Parameter	L78M05TL-TL-E (Main)	BA178M05CP-E2	BA78M05CP-E2	L78M05ABDT-TR	LM341T-5.0/NOPB
Manufacturer	onsemi	Rohm Semiconductor	Rohm Semiconductor	STMicroelectronics	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active
Output Voltage	5V	5V	5V	5V	5V
Output Current	500mA	500mA	500mA	500mA	500mA
Input Voltage (Max)	20V	25V	25V	35V	35V
Voltage Dropout (Max)	2V @ 350mA	2V @ 500mA	2V @ 500mA	Not specified	Not specified
Operating Temperature Range	-20°C ~ 80°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature	None listed	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
PSRR (120Hz)	80dB	78dB	78dB	62dB	78dB
Mounting Type	Not specified	Through Hole	Through Hole	Surface Mount	Through Hole
Package / Case	Not specified	TO-220-3 Cropped Leads	TO-220-3 Cropped Leads	TO-252-3, DPAK	TO-220-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All four substitute parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the main part. Selection among substitutes depends on application-specific constraints:

BA178M05CP-E2 and BA78M05CP-E2 (Rohm Semiconductor): Both maintain through-hole TO-220-3 mounting compatibility with extended input voltage tolerance (25V maximum). These parts are suitable for direct replacement in existing through-hole PCB designs. BA78M05CP-E2 includes over-current and over-temperature protection matching the original specification.

L78M05ABDT-TR (STMicroelectronics): Offers the highest input voltage rating (35V maximum) and extended operating temperature range (-40°C to 125°C). Surface-mount DPAK packaging requires PCB redesign but provides superior thermal performance and compact footprint. Includes comprehensive protection features (over-current, over-temperature, short-circuit).

LM341T-5.0/NOPB (Texas Instruments): Provides 35V input voltage tolerance and -40°C to 125°C operating range in through-hole TO-220-3 package. Maintains mechanical compatibility with original through-hole designs while offering enhanced electrical specifications and comprehensive protection features.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the L78M05TL-TL-E with any of these substitutes?

A: Direct replacement depends on package compatibility. BA178M05CP-E2, BA78M05CP-E2, and LM341T-5.0/NOPB use through-hole TO-220-3 packages suitable for existing through-hole PCB layouts. L78M05ABDT-TR requires surface-mount DPAK footprint and necessitates PCB redesign.

Q: What are the key electrical differences between substitutes?

A: All substitutes provide 5V fixed output at 500mA. Primary differences include input voltage tolerance (BA178M05CP-E2 and BA78M05CP-E2 at 25V maximum versus L78M05ABDT-TR and LM341T-5.0/NOPB at 35V maximum) and operating temperature range (Rohm parts at -40°C to 85°C versus STMicroelectronics and Texas Instruments at -40°C to 125°C).

Q: Which substitute offers the best thermal performance?

A: L78M05ABDT-TR in DPAK package provides superior thermal dissipation compared to through-hole alternatives due to its surface-mount design and tab connection to ground plane. This configuration supports higher ambient temperatures and improved heat transfer.

Q: Are all substitutes RoHS compliant?

A: Yes, all four substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original L78M05TL-TL-E.

Q: What protection features do the substitutes provide?

A: BA78M05CP-E2, L78M05ABDT-TR, and LM341T-5.0/NOPB include over-current and over-temperature protection. L78M05ABDT-TR and LM341T-5.0/NOPB additionally provide short-circuit protection. BA178M05CP-E2 does not list protection features in the provided specifications.

Q: Can I use a substitute with higher input voltage rating in a 20V application?

A: Yes. Substitutes with 25V or 35V maximum input ratings are backward compatible with applications designed for 20V maximum input. The higher rating provides additional design margin and flexibility for future applications.

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