MC7809ACT Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The MC7809ACT is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 9V 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 production continuity. The MC7809ACT delivers regulated power management suitable for applications requiring stable 9V rails with thermal and short-circuit protection.

Substiute Parts

MC7809ACT

onsemiIn Stock: 872MC7809ACT Datasheet

Current PartRFQ

MC7809ACTG

onsemiIn Stock: 1766MC7809ACTG Datasheet

DirectRFQ

MC7809CTG

onsemiIn Stock: 23360MC7809CTG Datasheet

Parametric EquivalentRFQ

L7809ACV

STMicroelectronicsIn Stock: 2496L7809ACV Datasheet

SimilarRFQ

L7809CV

STMicroelectronicsIn Stock: 204263L7809CV Datasheet

SimilarRFQ

L78M09CV

STMicroelectronicsIn Stock: 9997L78M09CV Datasheet

SimilarRFQ

L78S09CV

STMicroelectronicsIn Stock: 2712L78S09CV Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MC7809ACT are classified based on strict electrical and mechanical compatibility criteria:

Direct Manufacturer Equivalent (MC7809ACTG): Identical electrical specifications and package configuration. Differs only in packaging format (Tube) and RoHS compliance status (ROHS3 Compliant vs. RoHS non-compliant).

Parametric Equivalent (MC7809CTG): Maintains all critical electrical parameters including 9V fixed output, 1A current capacity, 35V maximum input, and TO-220-3 package. Minor variation in quiescent current (8 mA vs. 6 mA). Product status is Active, ensuring long-term availability. RoHS3 compliant.

Similar Substitutes (L7809ACV, L7809CV, L78M09CV, L78S09CV): STMicroelectronics alternatives with matching 9V output voltage, TO-220-3 package, and through-hole mounting. These parts vary in output current capacity and PSRR specifications:

• L7809ACV and L7809CV: 1.5A output current
• L78M09CV: 500mA output current
• L78S09CV: 2A output current

All substitute parts maintain the same output voltage (9V), input voltage rating (35V maximum), package type (TO-220-3), and protection features (Over Temperature, Short Circuit).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): MC7809ACTG is the primary choice when exact electrical and thermal performance matching is required. This part maintains all original specifications while offering ROHS3 compliance, improving long-term supply chain viability.

For Active Product Status: MC7809CTG is recommended when long-term availability and ongoing manufacturer support are critical. This part is currently Active, ensuring continued production and supply. The 2 mA increase in quiescent current is negligible for most applications and does not affect functional compatibility.

For Higher Current Capacity Applications: L7809ACV and L7809CV support 1.5A output current, providing design margin for applications approaching the 1A limit of the MC7809ACT. Both maintain the 9V output voltage and TO-220-3 package. L7809ACV offers lower quiescent current (6 mA) matching the original part.

For Current-Limited Applications: L78M09CV is suitable only for applications requiring 500mA or less, as its output current rating is below the MC7809ACT specification.

For Higher Current and Extended Temperature Range: L78S09CV provides 2A output current and extended operating temperature range (0°C ~ 150°C). PSRR is reduced to 47dB, which may impact noise-sensitive applications.

All substitute parts maintain RoHS3 compliance, ensuring compatibility with modern manufacturing and environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can MC7809ACTG be used as a direct replacement for MC7809ACT? A: Yes. MC7809ACTG is electrically and mechanically identical to MC7809ACT. The only differences are packaging format (Tube) and RoHS compliance status (ROHS3 Compliant). Both deliver 9V at 1A with identical thermal and electrical performance.

Q: What is the primary advantage of MC7809CTG over MC7809ACT? A: MC7809CTG is currently Active, ensuring ongoing manufacturer production and supply availability. MC7809ACT is obsolete. Electrical performance is equivalent with only a 2 mA increase in quiescent current, which is operationally insignificant for most applications.

Q: Can L7809CV replace MC7809ACT in all applications? A: L7809CV is mechanically and electrically compatible for applications requiring 9V output in a TO-220-3 package. However, it provides 1.5A output current (vs. 1A) and has slightly lower PSRR (55dB vs. 61dB). It is suitable for direct replacement but offers higher current capacity than required.

Q: What is the difference between L7809ACV, L7809CV, L78M09CV, and L78S09CV? A: These STMicroelectronics parts differ in output current capacity: L7809ACV and L7809CV provide 1.5A, L78M09CV provides 500mA, and L78S09CV provides 2A. All maintain 9V output voltage and TO-220-3 package. Selection depends on application current requirements.

Q: Is L78M09CV suitable for replacing MC7809ACT? A: L78M09CV is not recommended as a direct replacement. Its 500mA output current rating is below the MC7809ACT specification of 1A. Use only in applications confirmed to require 500mA or less.

Q: Does L78S09CV offer any advantages over MC7809ACT? A: L78S09CV provides higher output current (2A vs. 1A) and extended operating temperature range (0°C ~ 150°C vs. 0°C ~ 125°C). However, PSRR is reduced to 47dB. It is suitable for applications requiring higher current capacity or extended temperature operation.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts are ROHS3 compliant. MC7809ACT is RoHS non-compliant. For new designs or production requiring RoHS compliance, use MC7809ACTG, MC7809CTG, or STMicroelectronics alternatives.

Q: Can these parts be used interchangeably in PCB designs? A: Yes, all parts use identical TO-220-3 package and through-hole mounting. Pin configuration and footprint are identical, allowing direct PCB substitution without layout modifications.

Q: What is the inventory status of these parts? A: MC7809CTG has the highest inventory (23,318 pcs), followed by L7809CV (204,200 pcs). Both ensure reliable supply availability. MC7809ACT (827 pcs) and other alternatives have more limited stock due to obsolete status.