LM7815CT Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM7815CT is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 15V output at 1A current capacity in a TO-220-3 through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The LM7815CT serves applications requiring stable 15V regulation from input sources up to 35V, with integrated over-temperature and short-circuit protection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	15V
Output Current	1A
Input Voltage (Max)	35V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current (Iq)	8 mA
PSRR	70dB (120Hz)
Operating Temperature Range	-40°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole
Protection Features	Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitute parts for the LM7815CT are classified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Output voltage: 15V fixed
Output current capability: 1A or greater
Input voltage rating: 35V maximum
Package type: TO-220-3 through-hole
Protection features: Over-temperature and short-circuit protection

Substitution Categories:

Direct Substitutes (1A Output Current): Parts meeting all primary criteria with 1A output current rating are direct functional replacements. These include MC7815ACTG, MC7815CTG, MC7815ABTG, MC7815BTG, and NCV7815BTG from onsemi, as well as L7815ABV, L7815ABV-DG, and L7815ACV from STMicroelectronics.

Higher Current Capacity Substitutes (1.5A Output Current): STMicroelectronics L7815 series parts (L7815ABV, L7815ABV-DG, L7815ACV) provide 1.5A output current, exceeding the 1A requirement. These are backward-compatible for applications requiring the LM7815CT's 1A specification.

Lower Current Capacity Parts (500mA Output Current): MC78M15ABTG and MC78M15CTG provide 500mA output current, which is insufficient for direct replacement in applications requiring full 1A capacity but may be suitable for lower-current derivative designs.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Current	Iq (mA)	PSRR (dB)	Operating Temp (°C)	RoHS Status
LM7815CT	onsemi	Obsolete	1A	8	70	-40 ~ 125	Not Specified
MC7815ACTG	onsemi	Active	1A	6	80	0 ~ 125	ROHS3 Compliant
MC7815CTG	onsemi	Active	1A	6.5	58	0 ~ 125	ROHS3 Compliant
MC7815ABTG	onsemi	Active	1A	6	80	-40 ~ 125	ROHS3 Compliant
MC7815BTG	onsemi	Active	1A	8	58	-40 ~ 125	ROHS3 Compliant
NCV7815BTG	onsemi	Obsolete	1A	8	58	-40 ~ 125	ROHS3 Compliant
MC78M15ABTG	onsemi	Obsolete	500mA	Not Specified	70	-40 ~ 125	ROHS3 Compliant
MC78M15CTG	onsemi	Active	500mA	Not Specified	70	0 ~ 125	ROHS3 Compliant
L7815ABV	STMicroelectronics	Active	1.5A	6	58	-40 ~ 125	ROHS3 Compliant
L7815ABV-DG	STMicroelectronics	Active	1.5A	6	58	-40 ~ 125	ROHS3 Compliant
L7815ACV	STMicroelectronics	Active	1.5A	6	58	0 ~ 125	ROHS3 Compliant

Engineering Selection Recommendations

For New Designs (Recommended Primary Substitutes):

MC7815ABTG and MC7815BTG from onsemi are active-status direct replacements with identical 1A output current and full -40°C to 125°C operating temperature range matching the LM7815CT. Both are ROHS3 compliant. MC7815ABTG offers superior PSRR performance (80dB) and lower quiescent current (6mA), making it the preferred choice for noise-sensitive applications. MC7815BTG maintains the original 8mA quiescent current specification.

For Extended Temperature Range Applications:

L7815ABV, L7815ABV-DG, and L7815ACV from STMicroelectronics provide 1.5A output current with -40°C to 125°C operating range (L7815ABV and L7815ABV-DG) or 0°C to 125°C (L7815ACV). These parts exceed the 1A requirement and are suitable for applications with higher current demands or thermal margin requirements.

For Automotive Applications:

NCV7815BTG is an automotive-grade equivalent with AEC-Q100 qualification, though currently obsolete. For active automotive-qualified alternatives, consult manufacturer datasheets for current automotive-grade 15V regulator offerings.

For Lower Current Applications:

MC78M15CTG (active status) provides 500mA output current and is suitable only for applications where 1A capacity is not required. This part is not a direct replacement for full 1A designs.

Frequently Asked Questions (FAQ)

Q: Can MC7815CTG directly replace LM7815CT?

A: MC7815CTG is functionally compatible as a direct 1A substitute with identical output voltage and current specifications. However, it operates over 0°C to 125°C, narrower than the LM7815CT's -40°C to 125°C range. For applications requiring full temperature range operation, MC7815ABTG or MC7815BTG are preferred.

Q: What is the difference between MC7815ABTG and MC7815BTG?

A: Both are 1A, 15V regulators with -40°C to 125°C operating range. MC7815ABTG provides 80dB PSRR and 6mA quiescent current, while MC7815BTG provides 58dB PSRR and 8mA quiescent current. MC7815ABTG is superior for noise-sensitive applications.

Q: Can L7815ABV replace LM7815CT?

A: Yes. L7815ABV provides 1.5A output current (exceeding the 1A requirement), 15V fixed output, and -40°C to 125°C operating range. It is a backward-compatible substitute with higher current capacity and is ROHS3 compliant.

Q: Why are MC78M15ABTG and MC78M15CTG listed as substitutes if they provide only 500mA?

A: These 500mA parts are not direct replacements for 1A applications. They are listed as alternative options only for derivative designs or applications where reduced current capacity is acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: All active-status substitute parts listed are ROHS3 compliant. The original LM7815CT does not specify RoHS status. Obsolete parts (NCV7815BTG, MC78M15ABTG) are ROHS3 compliant but no longer in active production.

Q: What is the package compatibility between LM7815CT and substitutes?

A: All listed substitutes use TO-220-3 through-hole packaging, ensuring mechanical and thermal compatibility with LM7815CT footprints. Pinout and lead spacing are identical across all parts.

Q: Which substitute offers the best performance for noise-sensitive applications?

A: MC7815ABTG provides the highest PSRR (80dB at 120Hz) among 1A direct replacements, making it optimal for applications requiring superior power supply rejection ratio performance.

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