MC7905ACTG Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MC7905ACTG is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed negative 5V 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 design support and procurement continuity. The MC7905ACTG operates across a 0°C to 125°C temperature range and includes over-current and over-temperature protection features.

Key Parameters

Parameter	Value
Manufacturer Part Number	MC7905ACTG
Manufacturer	onsemi
Output Configuration	Negative
Output Type	Fixed
Voltage - Output (Min/Fixed)	-5V
Voltage - Input (Max)	-35V
Current - Output	1A
Voltage Dropout (Max)	1.3V @ 1A (Typ)
PSRR	70dB (120Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature	0°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the MC7905ACTG are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalent (Direct Replacement): Parts that match all critical electrical parameters and package specifications. These parts maintain identical output voltage (-5V fixed), input voltage rating (-35V max), and current capacity (1A), with equivalent or superior performance characteristics.

Similar Parts (Functional Alternatives): Parts that maintain the core functional requirements (negative 5V fixed output, TO-220-3 package, through-hole mounting) but may differ in current capacity, input voltage rating, dropout voltage, or PSRR specifications. These parts are suitable for applications where the MC7905ACTG specifications exceed actual circuit requirements.

Key Parameters Determining Substitution:

Output voltage: -5V fixed (mandatory)
Output configuration: Negative (mandatory)
Package / Case: TO-220-3 (mandatory for mechanical compatibility)
Mounting type: Through Hole (mandatory)
Operating temperature range: 0°C ~ 125°C (mandatory)
Current output capacity: ≥1A (minimum requirement)
Input voltage rating: ≥-35V (minimum requirement)

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Current Output	Voltage Input (Max)	Dropout Voltage (Max)	PSRR	Package	Product Status
MC7905ACTG	onsemi	-5V	1A	-35V	1.3V @ 1A	70dB (120Hz)	TO-220-3	Obsolete
MC7905CTG	onsemi	-5V	1A	-35V	1.3V @ 1A	70dB (120Hz)	TO-220-3	Active
L7905ACV	STMicroelectronics	-5V	1.5A	-35V	1.4V @ 1A	60dB (120Hz)	TO-220-3	Active
L7905CV	STMicroelectronics	-5V	1.5A	-35V	1.4V @ 1A	60dB (120Hz)	TO-220-3	Active
LM7905CT/NOPB	Texas Instruments	-5V	1.5A	-25V	1.1V @ 1A	66dB (120Hz)	TO-220-3	Active
UA7905CKCS	Texas Instruments	-5V	1.5A	-25V	1.1V @ 1A	60dB (120Hz)	TO-220-3	Last Time Buy
UA7905CKCSE3	Texas Instruments	-5V	1.5A	-25V	1.1V @ 1A	60dB (120Hz)	TO-220-3	Last Time Buy
UA79M05CKCS	Texas Instruments	-5V	500mA	-25V	1.1V @ 350mA	60dB (120Hz)	TO-220-3	Last Time Buy

Engineering Selection Recommendations

Primary Recommendation: MC7905CTG The MC7905CTG is the direct parametric equivalent to the MC7905ACTG, manufactured by onsemi with identical electrical specifications and package configuration. This part is currently in Active product status, ensuring long-term availability and supply chain continuity. Both parts are ROHS3 compliant and carry identical compliance certifications (REACH Unaffected, EAR99). Selection of MC7905CTG eliminates all technical substitution considerations and provides the most straightforward design continuity path.

Secondary Recommendations: L7905ACV and L7905CV Both STMicroelectronics parts (L7905ACV and L7905CV) provide higher current capacity (1.5A versus 1A) while maintaining the -5V fixed output and -35V input voltage rating. These parts are suitable for applications where the MC7905ACTG current specification exceeds actual circuit requirements. Both are Active status products with ROHS3 compliance. The L7905CV offers significantly higher inventory availability (88,791 units) compared to L7905ACV (11,200 units).

Tertiary Recommendations: LM7905CT/NOPB and UA7905CKCS The Texas Instruments LM7905CT/NOPB and UA7905CKCS both provide 1.5A output capacity with improved dropout voltage performance (1.1V @ 1A). However, the LM7905CT/NOPB has a reduced input voltage rating (-25V maximum versus -35V), which may limit suitability for applications requiring the full -35V input range. The UA7905CKCS maintains -25V input rating and is classified as Last Time Buy status. Both parts are ROHS3 compliant.

Not Recommended: UA79M05CKCS The UA79M05CKCS provides only 500mA output current, which is insufficient for applications requiring the 1A capacity of the MC7905ACTG. This part is suitable only for designs with reduced current requirements and is classified as Last Time Buy status.

Frequently Asked Questions (FAQ)

Q: Can MC7905CTG be used as a direct replacement for MC7905ACTG? A: Yes. MC7905CTG is the parametric equivalent with identical electrical specifications, output voltage (-5V), current capacity (1A), input voltage rating (-35V), and TO-220-3 package configuration. The primary difference is product status: MC7905ACTG is Obsolete while MC7905CTG is Active.

Q: What is the difference between L7905ACV and L7905CV? A: Both parts are manufactured by STMicroelectronics with identical electrical specifications. The primary difference is inventory availability: L7905CV has 88,791 units in stock compared to 11,200 units for L7905ACV. Both are suitable substitutes for the MC7905ACTG in applications where 1.5A output capacity is acceptable.

Q: Can I use LM7905CT/NOPB if my circuit requires -35V input voltage? A: No. The LM7905CT/NOPB has a maximum input voltage rating of -25V, which is insufficient for applications requiring the full -35V input range of the MC7905ACTG. Use L7905ACV, L7905CV, or MC7905CTG for -35V input voltage applications.

Q: Why is UA79M05CKCS listed as a substitute if it has lower current capacity? A: UA79M05CKCS is listed as a functional alternative only for applications where actual circuit current requirements are 500mA or less. It is not suitable for designs requiring the full 1A capacity of the MC7905ACTG.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed (MC7905CTG, L7905ACV, L7905CV, LM7905CT/NOPB, UA7905CKCS, UA7905CKCSE3, and UA79M05CKCS) are ROHS3 compliant and carry REACH Unaffected status.

Q: What is the difference between UA7905CKCS and UA7905CKCSE3? A: Both parts are manufactured by Texas Instruments with identical electrical specifications and TO-220-3 package configuration. Both are classified as Last Time Buy status. The primary difference is inventory availability: UA7905CKCS has 2,988 units in stock compared to 954 units for UA7905CKCSE3.

Q: Can I use a higher current-rated part (1.5A) in place of the 1A MC7905ACTG? A: Yes. Parts rated for higher current output (L7905ACV, L7905CV, LM7905CT/NOPB, UA7905CKCS, UA7905CKCSE3) are suitable substitutes. The higher current rating provides design margin and does not negatively impact circuit performance when the actual current requirement is 1A or less.

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