LM2575HVT-12 Buck Switching Regulator Equivalent & Substitute Parts

Part Overview

The LM2575HVT-12 is a buck switching regulator IC from Texas Instruments, part of the SIMPLE SWITCHER® series. It provides a fixed 12V output at 1A from input voltages ranging from 4V to 60V, operating at 52kHz switching frequency. The main part is currently in Last Time Buy status, making equivalent and substitute parts necessary for ongoing design support and procurement planning. Alternative parts maintain the same functional specifications while offering different availability, packaging, or manufacturer options.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Voltage	12V Fixed
Output Current	1A
Input Voltage Range	4V to 60V
Switching Frequency	52kHz
Package Type	TO-220-5
Operating Temperature	-40°C to 125°C (TJ)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the LM2575HVT-12 is determined by the following critical parameters:

Primary Substitution Criteria:

Output voltage: 12V fixed
Topology: Buck (step-down)
Package: TO-220-5 through-hole
Operating temperature range: -40°C to 125°C
Switching frequency: 52kHz

Secondary Considerations:

Output current capacity (1A minimum required)
Input voltage range (minimum 4V, maximum 40V or higher)
Synchronous rectifier: No
Mounting type: Through hole

Parts are grouped into two categories: direct equivalents (1A output) and higher-capacity alternatives (3A output). Direct equivalents maintain identical electrical specifications. Higher-capacity alternatives provide increased current handling while maintaining all other parameters, suitable for designs with current margin requirements.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Package	Product Status	RoHS3 Compliant
LM2575HVT-12	Texas Instruments	1A	60V	TO-220-5	Last Time Buy	Yes
LM2575HVT-12/NOPB	Texas Instruments	1A	60V	TO-220-5	Active	Yes
LM2575HVT-12/LF03	National Semiconductor	1A	60V	TO-220-5 Formed Leads	Active	Not specified
LM2575-12WT	Microchip Technology	1A	40V	TO-220-5	Active	Yes
LM2576-12WT	Microchip Technology	3A	40V	TO-220-5	Active	Yes
LM2576T-012G	onsemi	3A	40V	TO-220-5	Obsolete	Yes

Engineering Selection Recommendations

Direct Equivalents (1A Output):

LM2575HVT-12/NOPB (Texas Instruments) is the primary active equivalent. It maintains identical electrical specifications and is in active production status with full RoHS3 compliance. This part is recommended for new designs requiring direct replacement with maximum input voltage support (60V).

LM2575HVT-12/LF03 (National Semiconductor) provides electrical equivalence with formed leads packaging. It is in active status but RoHS3 compliance status is not specified in available data.

LM2575-12WT (Microchip Technology) is an active equivalent with reduced maximum input voltage (40V vs. 60V). This part is suitable for applications where input voltage does not exceed 40V and offers full RoHS3 compliance.

Higher-Capacity Alternatives (3A Output):

LM2576-12WT (Microchip Technology) provides 3A output capacity in the same TO-220-5 package with 40V maximum input voltage. This part is in active production with full RoHS3 compliance and is suitable for designs requiring increased current margin.

LM2576T-012G (onsemi) provides 3A output capacity but is in obsolete status. While inventory is available, this part should not be selected for new designs due to end-of-life status.

Compliance Considerations:

All recommended active parts maintain RoHS3 compliance and REACH unaffected status, suitable for regulated applications. The main part (LM2575HVT-12) is Last Time Buy; transition to LM2575HVT-12/NOPB is recommended for continuity.

Frequently Asked Questions (FAQ)

Q: Can LM2575-12WT replace LM2575HVT-12 in all applications?

A: LM2575-12WT is electrically equivalent for 1A applications but has a reduced maximum input voltage rating of 40V compared to 60V. It is suitable only for designs where input voltage does not exceed 40V.

Q: What is the difference between LM2575HVT-12 and LM2576-12WT?

A: The primary difference is output current capacity: LM2575HVT-12 provides 1A while LM2576-12WT provides 3A. Both operate at 52kHz with 12V fixed output. The LM2576 is suitable for applications requiring higher current or design margin.

Q: Is LM2576T-012G suitable for new designs?

A: No. LM2576T-012G is in obsolete status and should not be selected for new designs. Use LM2576-12WT (Microchip Technology) as the active alternative for 3A applications.

Q: What does "Formed Leads" mean for LM2575HVT-12/LF03?

A: Formed leads indicate the component leads have been pre-shaped for insertion into PCB holes. This is a packaging variation that does not affect electrical performance but may impact handling and insertion processes.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended active parts (LM2575HVT-12/NOPB, LM2575-12WT, LM2576-12WT) are RoHS3 compliant. LM2575HVT-12/LF03 compliance status is not specified. LM2576T-012G is RoHS3 compliant but obsolete.

Q: Can I use a 3A part in place of a 1A part?

A: Yes. LM2576-12WT (3A) can replace LM2575HVT-12 (1A) in the same application. The higher current rating provides additional design margin and does not negatively affect 1A load operation.

Q: What is the difference between LM2575HVT-12 and LM2575HVT-12/NOPB?

A: Both are Texas Instruments parts with identical electrical specifications. The main part is Last Time Buy status; LM2575HVT-12/NOPB is the active production equivalent recommended for new designs.

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