LM78M05CT Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM78M05CT is a linear voltage regulator IC manufactured by Texas Instruments, designed for positive fixed 5V output at 500mA in a TO-220-3 package. This device is classified as Last Time Buy, indicating limited future availability. Finding equivalent and substitute parts ensures design continuity and supply chain flexibility for applications requiring 5V regulated power with moderate current capacity.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	500mA
Input Voltage (Max)	35V
Output Configuration	Positive
Package / Case	TO-220-3
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LM78M05CT are categorized based on the following substitution criteria:

Direct Equivalents maintain identical electrical specifications and product status, ensuring pin-for-pin compatibility and functional interchangeability.

Parametric Equivalents share core electrical parameters (5V output, 500mA current, 35V input maximum, TO-220-3 package, -40°C to 125°C operating range) but may differ in quiescent current or PSRR characteristics. These parts are functionally compatible for most applications.

Manufacturer Recommended Alternatives provide enhanced specifications (higher output current capacity of 1.5A or 1.2A) while maintaining the same 5V output, 35V input maximum, and TO-220-3 package. These parts offer superior performance headroom and are suitable for applications requiring additional current margin.

Key Parameters for Substitution:

Output Voltage: 5V (fixed)
Package Type: TO-220-3
Input Voltage Rating: 35V maximum
Output Configuration: Positive
Protection Features: Over Temperature and Short Circuit (minimum requirement)

Parameter Comparison

Part Number	Manufacturer	Output Current	Quiescent Current	PSRR (120Hz)	Operating Temp	Product Status	Inventory
LM78M05CT	Texas Instruments	500mA	3mA	78dB	-40°C ~ 125°C	Last Time Buy	1591 Pcs
LM78M05CT/NOPB	Texas Instruments	500mA	3mA	78dB	-40°C ~ 125°C	Active	34100 Pcs
LM341T-5.0	Texas Instruments	500mA	4mA	78dB	-40°C ~ 125°C	Last Time Buy	2300 Pcs
LM341T-5.0/NOPB	Texas Instruments	500mA	4mA	78dB	-40°C ~ 125°C	Active	4002 Pcs
L7805ABV	STMicroelectronics	1.5A	6mA	68dB	-40°C ~ 125°C	Active	130821 Pcs
L7805ABV-DG	STMicroelectronics	1.5A	6mA	68dB	-40°C ~ 125°C	Active	2420 Pcs
L7805ACV	STMicroelectronics	1.5A	6mA	68dB	0°C ~ 125°C	Active	19349 Pcs
L7805ACV-DG	STMicroelectronics	1.5A	6mA	68dB	0°C ~ 125°C	Active	105300 Pcs
L7805CV	UMW	1.2A	6mA	Not Specified	-40°C ~ 105°C	Active	125400 Pcs
L78M05CV	STMicroelectronics	500mA	6mA	62dB	0°C ~ 150°C	Active	20526 Pcs
L78M05CV-DG	STMicroelectronics	500mA	6mA	62dB	0°C ~ 150°C	Obsolete	8083 Pcs

Engineering Selection Recommendations

For Direct Replacement (Active Status): LM78M05CT/NOPB is the primary choice, offering identical electrical specifications to the original LM78M05CT with Active product status and significantly higher inventory availability (34100 units). This part ensures seamless design continuity without performance trade-offs.

For Parametric Equivalence (Active Status): LM341T-5.0/NOPB provides equivalent performance with Active status and adequate inventory (4002 units). The 1mA increase in quiescent current is negligible for most applications.

For Enhanced Current Capacity (Active Status): L7805ACV-DG and L7805ABV offer 1.5A output current with Active status and extensive inventory availability (105300 and 130821 units respectively). These parts are suitable for applications requiring additional current margin while maintaining 5V output and TO-220-3 packaging. L7805ACV-DG supports the full -40°C to 125°C temperature range matching the original specification.

For Alternative Sourcing (Active Status): L78M05CV (STMicroelectronics) maintains 500mA output current with Active status and 20526 units in stock. This part extends the operating temperature range to 150°C, beneficial for high-temperature applications.

Avoid: L78M05CV-DG carries Obsolete status and should not be selected for new designs despite available inventory.

Frequently Asked Questions (FAQ)

Q: Can LM78M05CT/NOPB replace LM78M05CT directly? A: Yes. LM78M05CT/NOPB is electrically and functionally identical to LM78M05CT with identical pin configuration, output voltage, current rating, and protection features. The /NOPB suffix indicates lead-free plating and Active product status.

Q: What is the difference between LM78M05CT and LM341T-5.0? A: Both deliver 5V at 500mA in TO-220-3 packages with identical input voltage ratings and operating temperature ranges. The LM341T-5.0 has 1mA higher quiescent current (4mA vs 3mA) and identical PSRR performance. This difference is negligible in most applications.

Q: Can I use L7805ACV instead of LM78M05CT? A: Yes, with considerations. L7805ACV provides higher output current (1.5A vs 500mA) and maintains 5V output in TO-220-3 packaging. However, the operating temperature range is 0°C to 125°C (vs -40°C to 125°C), so it is unsuitable for applications requiring full -40°C operation. L7805ABV supports the full temperature range.

Q: Why do some parts have higher current ratings? A: L7805 series parts (1.5A) and L7805CV (1.2A) are manufacturer-recommended alternatives offering enhanced current capacity. These parts are suitable for applications requiring additional headroom beyond the original 500mA specification while maintaining 5V output and TO-220-3 compatibility.

Q: What does "Last Time Buy" status mean? A: Last Time Buy indicates the manufacturer will discontinue the part after current inventory is depleted. Active status parts are recommended for new designs to ensure long-term availability.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and are suitable for applications requiring lead-free components.

Q: Can I use L78M05CV-DG? A: L78M05CV-DG carries Obsolete status and should not be selected for new designs. Use L78M05CV (Active status) instead, which offers identical electrical specifications with ongoing manufacturer support.

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