LM78T05CT Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM78T05CT is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V output at 3A maximum current in a TO-220-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The LM78T05CT belongs to the Power Management (PMIC) category and is suitable for applications requiring regulated 5V power distribution with moderate current capacity. Substitute parts must maintain compatibility with the TO-220-3 through-hole mounting standard and preserve the core electrical characteristics of fixed positive voltage regulation.

Substiute Parts

LM78T05CT

onsemiIn Stock: 1072LM78T05CT Datasheet

Current PartRFQ

L7805ABV

STMicroelectronicsIn Stock: 130881L7805ABV Datasheet

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L7805ACV

STMicroelectronicsIn Stock: 19428L7805ACV Datasheet

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L7805CV

UMWIn Stock: 125416L7805CV Datasheet

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L7805CV-DG

STMicroelectronicsIn Stock: 205251L7805CV-DG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM78T05CT is determined by the following critical parameters:

• Fixed output voltage of 5V
• TO-220-3 through-hole package compatibility
• Positive output configuration
• Over temperature and short circuit protection
• Maximum input voltage of 35V
• Output current capacity (minimum 1.2A required for basic substitution; 1.5A or higher preferred for full-load equivalence)
• Quiescent current specification (6 mA nominal)

The substitute parts listed below maintain these core electrical and mechanical characteristics. Variations in output current capacity, dropout voltage, PSRR, and operating temperature ranges are noted in the parameter comparison table and must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are active products with current manufacturing status, ensuring long-term availability compared to the obsolete LM78T05CT. All STMicroelectronics and UMW variants are RoHS3 compliant, meeting modern environmental and regulatory requirements.

For applications requiring the full 3A output current of the original LM78T05CT, none of the listed substitutes provide equivalent current capacity. The highest-capacity alternatives are L7805ABV, L7805ACV, and L7805CV-DG, each rated at 1.5A maximum output current. Applications limited to 1.5A or lower load current can use these parts as direct functional replacements.

For applications with lower current requirements (1.2A or less), L7805CV from UMW provides an active alternative with extended low-temperature operation to -40°C.

STMicroelectronics parts (L7805ABV, L7805ACV, L7805CV-DG) offer superior PSRR performance and extended temperature ranges compared to the UMW variant, supporting noise-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can L7805ABV, L7805ACV, or L7805CV-DG replace the LM78T05CT in all applications?

A: These parts are functionally equivalent for applications drawing 1.5A or less. Applications requiring the full 3A output current of the LM78T05CT cannot use these 1.5A-rated substitutes without circuit redesign or parallel configuration.

Q: What is the difference between L7805ACV and L7805CV-DG?

A: Both are STMicroelectronics 5V regulators in TO-220-3 packages with 1.5A output current. L7805CV-DG has a quiescent current of 8 mA versus 6 mA for L7805ACV, and slightly lower PSRR (62dB versus 68dB). Both operate from 0°C to 125°C.

Q: Is the UMW L7805CV suitable for low-temperature applications?

A: Yes. The L7805CV operates from -40°C to 105°C, supporting extended low-temperature operation. However, its maximum output current is 1.2A, and PSRR is not specified.

Q: Are all substitute parts in the same TO-220-3 package?

A: Yes. All listed substitutes use the TO-220-3 through-hole package, maintaining mechanical and thermal compatibility with the original LM78T05CT footprint.

Q: Which substitute offers the best noise performance?

A: The LM78T05CT provides 75dB PSRR at 120Hz. Among substitutes, L7805ABV and L7805ACV offer 68dB PSRR, while L7805CV-DG provides 62dB PSRR. The UMW L7805CV does not specify PSRR.