L78M05T-TL-E Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The L78M05T-TL-E is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V output at 500mA. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The regulator features integrated over-current and over-temperature protection, suitable for applications requiring stable 5V power regulation from input sources up to 20V.

Key Parameters

Parameter	Value
Manufacturer Part Number	L78M05T-TL-E
Manufacturer	onsemi
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Fixed)	5V
Voltage - Input (Max)	20V
Current - Output	500mA
Voltage Dropout (Max)	2V @ 350mA (Typ)
PSRR	80dB (120Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature	-20°C ~ 80°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the L78M05T-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 output
Input voltage rating of 20V or higher
Over-current and over-temperature protection features
ROHS3 compliance and REACH unaffected status

Substitute parts must maintain electrical compatibility across these parameters while accommodating variations in package type, mounting method, and extended operating temperature ranges where applicable.

Parameter Comparison

Parameter	L78M05T-TL-E (Main)	BA178M05CP-E2	BA78M05CP-E2	L78M05ABDT-TR	LM341T-5.0/NOPB
Manufacturer	onsemi	Rohm Semiconductor	Rohm Semiconductor	STMicroelectronics	Texas Instruments
Output Voltage (Fixed)	5V	5V	5V	5V	5V
Output Current	500mA	500mA	500mA	500mA	500mA
Voltage - Input (Max)	20V	25V	25V	35V	35V
Voltage Dropout (Max)	2V @ 350mA	2V @ 500mA	2V @ 500mA	Not specified	Not specified
PSRR	80dB (120Hz)	78dB (120Hz)	78dB (120Hz)	62dB (120Hz)	78dB (120Hz)
Protection Features	Over Current, Over Temperature	None listed	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	-20°C ~ 80°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
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
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed 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 are Rohm Semiconductor alternatives with active product status. Both maintain the 5V/500mA specification with higher maximum input voltage ratings (25V) and extended operating temperature ranges (-40°C to 85°C). These parts are suitable for through-hole mounting applications and provide comparable PSRR performance. BA78M05CP-E2 includes over-current and over-temperature protection matching the original part's protection features.

L78M05ABDT-TR is an STMicroelectronics surface-mount alternative in DPAK package format. This part offers the highest maximum input voltage (35V) and extended operating temperature range (-40°C to 125°C), with additional short-circuit protection. PSRR is lower at 62dB compared to the original specification.

LM341T-5.0/NOPB is a Texas Instruments through-hole alternative in standard TO-220-3 package. This part provides maximum input voltage of 35V, extended operating temperature range (-40°C to 125°C), and comprehensive protection features including short-circuit protection. PSRR performance is 78dB, matching BA178M05CP-E2 and BA78M05CP-E2.

Frequently Asked Questions (FAQ)

Q: Can I directly replace L78M05T-TL-E with any of these substitute parts?

A: Direct replacement depends on your application's package and mounting requirements. All substitutes maintain the critical electrical specifications (5V output, 500mA current, positive fixed configuration). Verify your PCB design accommodates the substitute's package type before implementation.

Q: What is the difference between through-hole and surface-mount alternatives?

A: BA178M05CP-E2, BA78M05CP-E2, and LM341T-5.0/NOPB are through-hole mounted devices suitable for traditional PCB designs. L78M05ABDT-TR is surface-mount in DPAK package, requiring SMD assembly processes. Choose based on your manufacturing capability and PCB layout.

Q: Why do some substitutes have higher maximum input voltage ratings?

A: BA78M05CP-E2, L78M05ABDT-TR, and LM341T-5.0/NOPB support higher input voltages (25V or 35V) compared to the original 20V specification. These parts remain compatible with the L78M05T-TL-E in applications using lower input voltages, providing additional design margin and flexibility for future applications.

Q: Are all substitutes suitable for the same operating temperature range?

A: No. The original L78M05T-TL-E operates from -20°C to 80°C. All substitutes extend this range to at least -40°C to 85°C, with L78M05ABDT-TR and LM341T-5.0/NOPB reaching -40°C to 125°C. Select based on your application's thermal requirements.

Q: What protection features should I verify when selecting a substitute?

A: The original part includes over-current and over-temperature protection. BA78M05CP-E2 matches this protection set. L78M05ABDT-TR and LM341T-5.0/NOPB add short-circuit protection. BA178M05CP-E2 does not list protection features in available documentation. Verify protection requirements for your application before selection.

Q: How does PSRR affect my circuit design?

A: PSRR (Power Supply Rejection Ratio) indicates how effectively the regulator rejects input voltage ripple. The original part specifies 80dB at 120Hz. BA178M05CP-E2, BA78M05CP-E2, and LM341T-5.0/NOPB provide 78dB, while L78M05ABDT-TR provides 62dB. Higher PSRR values provide better noise rejection; lower values may require additional input filtering in noise-sensitive applications.

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