MC7808AECTBU Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MC7808AECTBU is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 8V output at 1A current capacity in a TO-220-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The MC7808AECTBU serves applications requiring stable 8V regulation from input sources up to 35V with integrated over-temperature and short-circuit protection.

Substiute Parts

MC7808AECTBU

onsemiIn Stock: 848MC7808AECTBU Datasheet

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MC7808CTG

onsemiIn Stock: 1512MC7808CTG Datasheet

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MC78M08ABTG

onsemiIn Stock: 1224MC78M08ABTG Datasheet

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L7808ABV

STMicroelectronicsIn Stock: 18496L7808ABV Datasheet

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L7808ABV-DG

STMicroelectronicsIn Stock: 23504L7808ABV-DG Datasheet

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L7808ACV

STMicroelectronicsIn Stock: 5301L7808ACV Datasheet

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L7808ACV-DG

STMicroelectronicsIn Stock: 1639L7808ACV-DG Datasheet

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L7808CV

STMicroelectronicsIn Stock: 205332L7808CV Datasheet

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MC7808ABTG

onsemiIn Stock: 1609MC7808ABTG Datasheet

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MC78M08CTG

onsemiIn Stock: 1168MC78M08CTG Datasheet

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UA7808CKCS

Texas InstrumentsIn Stock: 3090UA7808CKCS Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MC7808AECTBU is determined by the following critical parameters:

• Output Voltage: Must be fixed at 8V
• Output Current Capability: Minimum 1A required for direct substitution
• Input Voltage Rating: Must support up to 35V maximum input
• Package Type: TO-220-3 or compatible TO-220 footprint
• Protection Features: Over-temperature and short-circuit protection required
• Voltage Dropout: Maximum 2V @ 1A for thermal performance equivalence

Substitute parts are grouped into two categories:

Category 1 - Direct Equivalents (1A Output): Parts meeting all parameters including 1A output current, suitable for direct replacement without circuit modification.

Category 2 - Higher Current Alternatives (1.5A Output): Parts with 1.5A output capability, electrically compatible but providing additional current headroom. These are suitable substitutes when the application can tolerate higher current capacity.

Category 3 - Lower Current Alternatives (500mA Output): Parts with 500mA output capability. These are suitable only for applications where the load current does not exceed 500mA.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - MC7808CTG (onsemi)

MC7808CTG is the preferred substitute for MC7808AECTBU. Both devices are manufactured by onsemi with identical electrical specifications (8V output, 1A current, 35V maximum input, 2V dropout). MC7808CTG holds Active product status, ensuring long-term availability and supply chain continuity. The device is RoHS3 compliant and carries identical REACH and ECCN classifications. The only parameter variance is quiescent current (8 mA versus 6 mA), which is negligible for most applications. Packaging is TO-220-3, providing direct mechanical compatibility.

Secondary Recommendation - L7808ACV-DG (STMicroelectronics)

L7808ACV-DG is an Active product from STMicroelectronics suitable for applications requiring higher current capacity (1.5A versus 1A). This part maintains all critical electrical parameters including 8V output, 35V maximum input, and 2V dropout specification. Operating temperature range matches the original part (0°C ~ 125°C). RoHS3 compliance and REACH status are equivalent. The higher current rating provides design margin without circuit modification. TO-220-3 package ensures mechanical compatibility.

Tertiary Recommendation - L7808ABV (STMicroelectronics)

L7808ABV provides 1.5A output capacity with extended operating temperature range (-40°C ~ 125°C), suitable for applications requiring wider temperature performance. Electrical specifications remain equivalent to the original part. This part is obsolete but maintains high inventory availability (18,401 units). Use this option only when extended temperature range is required and supply of active alternatives is constrained.

Not Recommended - UA7808CKCS (Texas Instruments)

UA7808CKCS has a reduced maximum input voltage rating (25V versus 35V), making it unsuitable for applications utilizing the full 35V input specification of the original part. This part should be selected only when input voltage is confirmed to remain below 25V.

Not Recommended - MC78M08 Series (500mA Output)

MC78M08ABTG and MC78M08CTG are rated for 500mA output current, insufficient for applications requiring the full 1A capacity of the original part. These parts are suitable only for load currents not exceeding 500mA.

Frequently Asked Questions (FAQ)

Q: Can I use L7808ACV-DG as a direct replacement for MC7808AECTBU?

A: Yes. L7808ACV-DG is electrically compatible with MC7808AECTBU. Both provide 8V fixed output, support 35V maximum input, and feature identical voltage dropout specifications. The higher 1.5A current rating of L7808ACV-DG does not create compatibility issues. Operating temperature range (0°C ~ 125°C) matches the original part. TO-220-3 package provides direct mechanical compatibility. L7808ACV-DG is an Active product, ensuring supply continuity.

Q: What is the difference between MC7808CTG and MC7808AECTBU?

A: Both parts are 8V, 1A linear regulators from onsemi with identical electrical specifications. MC7808AECTBU is obsolete while MC7808CTG is Active. Quiescent current differs slightly (8 mA versus 6 mA), which is negligible in most applications. MC7808CTG is the recommended upgrade path for obsolete MC7808AECTBU designs.

Q: Can I use a 500mA regulator (MC78M08CTG) instead of the 1A MC7808AECTBU?

A: Only if your application load current does not exceed 500mA. The MC78M08CTG is rated for maximum 500mA output, while MC7808AECTBU supports 1A. Using an undersized regulator for higher load currents will cause thermal shutdown or damage. Verify actual load current requirements before selecting a lower-rated alternative.

Q: Why does UA7808CKCS have a lower maximum input voltage (25V)?

A: UA7808CKCS from Texas Instruments is specified for 25V maximum input, compared to 35V for the original MC7808AECTBU. This is a design difference between manufacturers. If your circuit uses input voltages above 25V, UA7808CKCS is not suitable. Confirm your actual input voltage range before selecting this part.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed carry RoHS3 compliance status. All parts are REACH Unaffected and classified as EAR99 for export control purposes. Compliance certifications are equivalent across all recommended substitutes.

Q: What is the difference between L7808ABV and L7808ACV?

A: Both are 1.5A, 8V regulators from STMicroelectronics with identical electrical specifications. The primary difference is operating temperature range: L7808ABV supports -40°C ~ 125°C while L7808ACV supports 0°C ~ 125°C. Select L7808ABV only if your application requires operation below 0°C. For standard 0°C ~ 125°C applications, L7808ACV is sufficient.

Q: Can I use L7808CV instead of L7808ACV-DG?

A: L7808CV is electrically compatible but is obsolete. L7808ACV-DG is the Active equivalent with identical specifications. PSRR differs slightly (56dB for L7808CV versus 62dB for L7808ACV-DG), indicating marginally better noise performance in L7808ACV-DG. For new designs, select L7808ACV-DG to ensure supply continuity.

Q: What does the "-DG" suffix mean in part numbers like L7808ACV-DG?

A: The "-DG" suffix indicates the specific packaging and distribution format from STMicroelectronics. L7808ACV-DG and L7808ACV are electrically identical but may differ in packaging presentation (tube versus other formats). Both are compatible for circuit functionality. Verify packaging requirements with your procurement process.