LM7912CT Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM7912CT is a negative fixed linear voltage regulator IC manufactured by Texas Instruments, rated for -12V output at 1.5A in a TO-220-3 package. This device is classified as Last Time Buy, indicating limited future availability. Identifying qualified substitute parts ensures design continuity and supply chain resilience for applications requiring negative voltage regulation in this performance class.

Key Parameters

Parameter	Value
Output Configuration	Negative
Output Type	Fixed
Voltage - Output (Min/Fixed)	-12V
Voltage - Input (Max)	-35V
Current - Output	1.5A
Voltage Dropout (Max)	1.1V @ 1A
Operating Temperature	0°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LM7912CT are classified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Output Configuration: Negative
Output Type: Fixed
Voltage - Output (Min/Fixed): -12V
Voltage - Input (Max): -35V
Package / Case: TO-220-3
Mounting Type: Through Hole
RoHS Status: ROHS3 Compliant

Secondary Consideration:

Current - Output: Parts rated at 1.5A provide direct equivalence; parts rated at 1A or 500mA are functional substitutes for applications requiring lower current capacity

Substitute parts are grouped into three categories: Direct Manufacturer Equivalents (same part number variants), Manufacturer Recommended Alternatives (onsemi equivalents), and Parametric Equivalents (STMicroelectronics alternatives).

Parameter Comparison

Part Number	Manufacturer	Output Current	Voltage Dropout (Max)	Operating Temp	Product Status	Inventory (Pcs)
LM7912CT	Texas Instruments	1.5A	1.1V @ 1A	0°C ~ 125°C	Last Time Buy	4,871
LM7912CT/NOPB	Texas Instruments	1.5A	1.1V @ 1A	0°C ~ 125°C	Active	2,841
MC7912ACTG	onsemi	1A	1.3V @ 1A (Typ)	0°C ~ 125°C	Active	2,190
MC7912BTG	onsemi	1A	1.3V @ 1A (Typ)	-40°C ~ 125°C	Active	15,300
MC7912CTG	onsemi	1A	1.3V @ 1A (Typ)	0°C ~ 125°C	Active	4,900
MC79M12BTG	onsemi	500mA	1.1V @ 500mA (Typ)	-40°C ~ 125°C	Active	3,772
L7912ACV	STMicroelectronics	1.5A	1.1V @ 1A (Typ)	0°C ~ 125°C	Active	25,300
L7912ACV-DG	STMicroelectronics	1.5A	1.1V @ 1A (Typ)	0°C ~ 125°C	Obsolete	5,400
L7912CV	STMicroelectronics	1.5A	1.1V @ 1A (Typ)	0°C ~ 125°C	Active	75,300
L7912CV-DG	STMicroelectronics	1.5A	1.1V @ 1A (Typ)	0°C ~ 125°C	Active	158,850

Engineering Selection Recommendations

Preferred Primary Substitute: LM7912CT/NOPB This part maintains identical electrical specifications and packaging to the LM7912CT while carrying Active product status. It is the direct equivalent with NOPB (No Plumbum/Lead-Free) designation and represents the lowest-risk substitution path.

Preferred Secondary Substitute: L7912CV-DG (STMicroelectronics) This parametric equivalent delivers 1.5A output current with matching voltage dropout characteristics and operating temperature range. It maintains Active product status with the highest inventory availability (158,850 units), ensuring long-term supply security. All parts meet ROHS3 compliance and REACH requirements.

Alternative for Extended Temperature Range: MC7912BTG (onsemi) For applications requiring operation below 0°C, MC7912BTG extends the lower operating temperature to -40°C. Output current is reduced to 1A, suitable for lower-power applications. This part carries Active status with substantial inventory (15,300 units).

Not Recommended: L7912ACV-DG Although parametrically equivalent, this part carries Obsolete product status and should be avoided for new designs despite current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM7912CT with LM7912CT/NOPB? A: Yes. LM7912CT/NOPB is the direct equivalent with identical electrical and mechanical specifications. The /NOPB suffix indicates lead-free compliance and represents the current production variant.

Q: What is the difference between the onsemi MC7912 series parts? A: MC7912ACTG, MC7912BTG, and MC7912CTG all deliver 1A output current with identical voltage regulation characteristics. MC7912BTG extends the operating temperature range to -40°C. Selection depends on temperature requirements and inventory availability.

Q: Can I use MC79M12BTG as a substitute? A: MC79M12BTG is a functional substitute only for applications requiring 500mA or less. It is not suitable for designs requiring the full 1.5A output capacity of the LM7912CT.

Q: Why are STMicroelectronics L7912 parts listed as parametric equivalents? A: L7912 series parts deliver identical output current (1.5A), voltage regulation (-12V), and dropout characteristics as the LM7912CT. They are manufactured by a different supplier but meet all functional requirements. Parametric equivalence means they satisfy the same electrical specifications within the allowed parameter ranges.

Q: Is the TO-220-3 package identical across all substitute parts? A: Yes. All listed substitute parts use the TO-220-3 package with identical pinout and mechanical dimensions, enabling direct PCB-level substitution without layout modifications.

Q: Which substitute offers the best long-term availability? A: L7912CV-DG (STMicroelectronics) carries the highest inventory (158,850 units) and Active product status, providing the strongest supply chain assurance for future procurement.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts meet ROHS3 compliance and REACH requirements, ensuring regulatory alignment with current environmental standards.

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