MC7808ACT Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The MC7808ACT is a linear voltage regulator IC from onsemi, designed to provide a fixed positive 8V output at 1A current capacity in a TO-220-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The MC7808ACT serves as a positive fixed output regulator suitable for power management circuits requiring stable 8V regulation with integrated over-temperature and short-circuit protection.

Substiute Parts

MC7808ACT

onsemiIn Stock: 3643MC7808ACT Datasheet

Current PartRFQ

MC7808CTG

onsemiIn Stock: 1512MC7808CTG Datasheet

Parametric EquivalentRFQ

UA7808CKCS

Texas InstrumentsIn Stock: 3090UA7808CKCS Datasheet

DirectRFQ

L7808ABV

STMicroelectronicsIn Stock: 18496L7808ABV Datasheet

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L7808ACV

STMicroelectronicsIn Stock: 5301L7808ACV Datasheet

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L7808CV

STMicroelectronicsIn Stock: 205332L7808CV Datasheet

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UA7808CKCSE3

Texas InstrumentsIn Stock: 8683UA7808CKCSE3 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MC7808ACT is determined by the following critical parameters:

• Fixed output voltage of 8V
• TO-220-3 package configuration with through-hole mounting
• Positive output configuration
• Over-temperature and short-circuit protection features
• Operating temperature range compatibility (0°C ~ 125°C minimum)

Substitute parts are grouped into two categories:

Parametric Equivalent: MC7808CTG maintains identical electrical specifications and base product lineage (MC7808 series) with the primary difference being active product status and improved RoHS compliance.

Direct and Similar Equivalents: UA7808CKCS, L7808ABV, L7808ACV, L7808CV, and UA7808CKCSE3 provide functional equivalence with variations in output current capacity (1.5A vs. 1A), input voltage ratings, quiescent current, and manufacturer origin. All maintain the 8V fixed output, TO-220-3 package, and core protection features required for direct substitution in applications where the MC7808ACT is specified.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: MC7808CTG

The MC7808CTG is the optimal substitute for the MC7808ACT. Both parts share identical electrical specifications, the same onsemi manufacturer lineage, and maintain the MC7808 base product number. The MC7808CTG is currently in active product status and achieves ROHS3 compliance, addressing the obsolescence and regulatory limitations of the MC7808ACT. Pinout and package compatibility are guaranteed.

Secondary Recommendations: L7808CV, L7808ABV, L7808ACV

These STMicroelectronics parts provide functional equivalence with higher output current capacity (1.5A vs. 1A). The L7808CV offers the largest inventory availability (205,300 pcs) and maintains all core electrical parameters. L7808ABV supports an extended operating temperature range (-40°C ~ 125°C). All three achieve ROHS3 compliance. These parts are suitable for applications where the 1A output current of the MC7808ACT is not a limiting factor.

Alternative Recommendations: UA7808CKCS, UA7808CKCSE3

Texas Instruments UA7808 series parts provide functional equivalence with 1.5A output current and enhanced PSRR performance (72dB ~ 62dB). Both achieve ROHS3 compliance. The UA7808CKCS and UA7808CKCSE3 feature reverse polarity protection in addition to over-temperature and short-circuit protection. Input voltage maximum is limited to 25V compared to the 35V rating of the MC7808ACT; this constraint must be evaluated against circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can MC7808CTG directly replace MC7808ACT without circuit modification?

A: Yes. The MC7808CTG maintains identical electrical specifications, the same TO-220-3 package pinout, and equivalent protection features. No circuit modification is required for direct substitution.

Q: What is the primary difference between MC7808ACT and MC7808CTG?

A: The MC7808CTG is the active production equivalent with ROHS3 compliance. The MC7808ACT is obsolete and RoHS non-compliant. Electrical performance is identical.

Q: Can I use L7808CV instead of MC7808ACT?

A: Yes, with consideration of output current capacity. The L7808CV provides 1.5A output current versus the 1A of the MC7808ACT. If your circuit draws less than 1A, the L7808CV is a suitable substitute. The L7808CV achieves ROHS3 compliance and has extensive inventory availability.

Q: What is the impact of the 25V input voltage limit on UA7808CKCS compared to MC7808ACT?

A: The MC7808ACT accepts input voltages up to 35V, while UA7808CKCS is rated to 25V maximum. If your circuit operates with input voltages between 25V and 35V, the UA7808CKCS is not suitable. For input voltages below 25V, the UA7808CKCS is functionally equivalent.

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

A: Yes. All substitute parts listed are packaged in TO-220-3 configuration with through-hole mounting, ensuring mechanical and electrical compatibility with the MC7808ACT footprint.

Q: Which substitute offers the best RoHS compliance status?

A: All substitute parts except the MC7808ACT achieve ROHS3 compliance. The MC7808CTG, as the active onsemi equivalent, is the recommended choice for new designs requiring RoHS compliance.

Q: What is the difference between quiescent current specifications across these parts?

A: Quiescent current varies from 6 mA (MC7808ACT, MC7808CTG, L7808ABV, L7808ACV) to 8 mA (L7808CV). This parameter affects standby power consumption. For low-power applications, parts with 6 mA quiescent current are preferred.