LM7915CT Linear Voltage Regulator IC Negative Fixed -15V 1.5A TO-220-3

Part Overview

The LM7915CT is a linear voltage regulator IC manufactured by Texas Instruments, designed to provide a fixed negative output voltage of -15V at 1.5A output current. This device is classified as a Power Management (PMIC) component and is packaged in TO-220-3 through-hole configuration. The LM7915CT is currently in Last Time Buy status, indicating limited availability from the original manufacturer. Alternative equivalent and substitute parts are necessary to ensure design continuity and long-term supply chain reliability for applications requiring negative voltage regulation.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM7915CT
Output Voltage (Fixed)	-15V
Output Current	1.5A
Input Voltage (Max)	-35V
Voltage Dropout (Max)	1.1V @ 1A
Package / Case	TO-220-3
Operating Temperature	0°C ~ 125°C
Protection Features	Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LM7915CT are classified into three categories based on electrical and mechanical compatibility:

Direct Manufacturer Equivalents maintain identical electrical specifications and are sourced from the original manufacturer (Texas Instruments) or authorized cross-references. These parts share the same output voltage (-15V), output current (1.5A), input voltage rating (-35V max), dropout voltage (1.1V @ 1A), and TO-220-3 package configuration.

Manufacturer Recommended Substitutes are sourced from onsemi and provide functional equivalence with minor parameter variations. These parts maintain the -15V output voltage, -35V input voltage rating, and TO-220-3 package, but feature reduced output current ratings (1A or 500mA) and slightly higher dropout voltages (1.3V @ 1A typical for 1A variants, 1.1V @ 500mA typical for 500mA variants). These substitutes are suitable for applications where the full 1.5A output current is not required.

Parametric Equivalents are sourced from STMicroelectronics (L7915 series) and provide full electrical equivalence with identical output voltage (-15V), output current (1.5A), input voltage rating (-35V max), and dropout voltage (1.1V @ 1A typical). These parts are functionally interchangeable with the LM7915CT and are available in high inventory quantities.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Package	Operating Temp	Product Status
LM7915CT	Texas Instruments	-15V	1.5A	-35V	1.1V @ 1A	TO-220-3	0°C ~ 125°C	Last Time Buy
LM7915CT/NOPB	Texas Instruments	-15V	1.5A	-35V	1.1V @ 1A	TO-220-3	0°C ~ 125°C	Active
MC7915ACTG	onsemi	-15V	1A	-35V	1.3V @ 1A (Typ)	TO-220-3	0°C ~ 125°C	Active
MC7915BTG	onsemi	-15V	1A	-35V	1.3V @ 1A (Typ)	TO-220-3	-40°C ~ 125°C	Active
MC7915CTG	onsemi	-15V	1A	-35V	1.3V @ 1A (Typ)	TO-220-3	0°C ~ 125°C	Active
MC79M15BTG	onsemi	-15V	500mA	-35V	1.1V @ 500mA (Typ)	TO-220-3	-40°C ~ 125°C	Active
MC79M15CTG	onsemi	-15V	500mA	-35V	1.1V @ 500mA (Typ)	TO-220-3	0°C ~ 125°C	Active
L7915ACV	STMicroelectronics	-15V	1.5A	-35V	1.1V @ 1A (Typ)	TO-220-3	0°C ~ 125°C	Active
L7915CV	STMicroelectronics	-15V	1.5A	-35V	1.1V @ 1A (Typ)	TO-220-3	0°C ~ 125°C	Active
L7915CV-DG	STMicroelectronics	-15V	1.5A	-35V	1.1V @ 1A (Typ)	TO-220-3	0°C ~ 125°C	Active

Engineering Selection Recommendations

For Direct Replacement (No Design Changes Required): LM7915CT/NOPB is the primary direct substitute, maintaining identical electrical specifications and TO-220-3 package configuration. This part is manufactured by Texas Instruments and carries Active product status, ensuring long-term availability and supply chain stability.

For Full Electrical Equivalence with Extended Availability: The STMicroelectronics L7915 series (L7915CV, L7915CV-DG, L7915ACV) provides complete parametric equivalence with the LM7915CT, including 1.5A output current capability and identical voltage ratings. These parts are ROHS3 compliant and carry Active product status. L7915CV-DG offers the highest inventory availability (201,850 pcs) among all substitute options.

For Current-Limited Applications: onsemi MC7915 series (MC7915ACTG, MC7915BTG, MC7915CTG) are suitable for applications requiring 1A output current. MC7915BTG extends the operating temperature range to -40°C ~ 125°C, providing enhanced low-temperature performance. These parts maintain the -15V output voltage and -35V input voltage rating.

For Low-Current Applications: onsemi MC79M15 series (MC79M15BTG, MC79M15CTG) are appropriate for applications requiring 500mA output current. MC79M15BTG provides extended temperature range (-40°C ~ 125°C) and is available in high inventory (8,723 pcs).

All substitute parts listed are ROHS3 compliant and carry EAR99 ECCN classification, matching the regulatory status of the original LM7915CT.

Frequently Asked Questions (FAQ)

Q: Can LM7915CT/NOPB be used as a direct replacement for LM7915CT? A: Yes. LM7915CT/NOPB is a direct equivalent manufactured by Texas Instruments with identical electrical specifications, output voltage (-15V), output current (1.5A), input voltage rating (-35V), dropout voltage (1.1V @ 1A), and TO-220-3 package configuration. No circuit modifications are required.

Q: What is the difference between LM7915CT and the STMicroelectronics L7915 series? A: The L7915 series (L7915CV, L7915CV-DG, L7915ACV) provides parametric equivalence with identical -15V output voltage, 1.5A output current, -35V input voltage rating, and 1.1V dropout voltage. The primary difference is manufacturer origin. All parts are ROHS3 compliant and suitable for direct substitution.

Q: Can onsemi MC7915 series parts replace the LM7915CT? A: onsemi MC7915 series parts (MC7915ACTG, MC7915BTG, MC7915CTG) maintain the -15V output voltage and -35V input voltage rating but feature reduced output current (1A instead of 1.5A). These substitutes are suitable only for applications where 1A output current is sufficient. MC7915BTG provides extended operating temperature range (-40°C ~ 125°C).

Q: What is the difference between MC7915CTG and MC79M15CTG? A: MC7915CTG provides 1A output current, while MC79M15CTG provides 500mA output current. Both maintain -15V output voltage and -35V input voltage rating. MC79M15CTG is suitable for lower-current applications and features lower dropout voltage (1.1V @ 500mA typical).

Q: Are all substitute parts available in TO-220-3 package? A: Yes. All substitute parts listed are packaged in TO-220-3 through-hole configuration, ensuring mechanical compatibility with the original LM7915CT footprint.

Q: Which substitute part offers the highest inventory availability? A: L7915CV-DG from STMicroelectronics offers the highest inventory availability with 201,850 pcs in stock, providing superior supply chain security for high-volume applications.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed carry ROHS3 compliance status, matching the regulatory requirements of the original LM7915CT.

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