LM2576HVT-ADJ Buck Switching Regulator IC Equivalent & Substitute Parts

Part Overview

The LM2576HVT-ADJ is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for step-down voltage conversion with positive adjustable output. This part operates with input voltage range of 4V to 60V and delivers 3A output current at adjustable voltage from 1.23V to 57V. The device is classified as Last Time Buy, indicating production discontinuation. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this topology and performance class.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2576HVT-ADJ
Manufacturer	Texas Instruments
Function	Step-Down (Buck)
Output Type	Adjustable
Output Configuration	Positive
Voltage - Input (Min/Max)	4V / 60V
Voltage - Output (Min/Max)	1.23V / 57V
Current - Output	3A
Frequency - Switching	52kHz
Package / Case	TO-220-5
Operating Temperature	-40°C ~ 125°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution for the LM2576HVT-ADJ is determined by the following critical parameters:

Primary Substitution Criteria:

Topology: Buck (step-down) switching regulator
Output Configuration: Positive
Package: TO-220-5 (mechanical and thermal compatibility)
Input Voltage Range: 4V to 60V minimum
Switching Frequency: 52kHz
Operating Temperature: -40°C to 125°C
Series: SIMPLE SWITCHER®

Output Current Consideration: The LM2576HVT-ADJ delivers 3A output current. Substitute parts with lower current ratings (1A) are functionally compatible but represent downrated alternatives suitable only for applications requiring reduced output current.

Output Voltage Consideration: The LM2576HVT-ADJ provides adjustable output voltage from 1.23V to 57V. Substitute parts with fixed output voltages (12V, 15V, 5V, 3.3V) are compatible only when the application requires that specific fixed voltage. The LM2575HVT-ADJ and LM2575T-ADJ maintain adjustable output capability with reduced current rating.

Input Voltage Range Limitation: Substitute parts designated as LM2575T (standard temperature) variants have maximum input voltage of 40V, compared to 60V for HVT variants. This represents a functional limitation for high-input-voltage applications.

Parameter Comparison

Part Number	Manufacturer	Output Type	Output Voltage	Output Current	Input Voltage (Min/Max)	Package	Product Status	Inventory
LM2576HVT-ADJ	Texas Instruments	Adjustable	1.23V - 57V	3A	4V / 60V	TO-220-5	Last Time Buy	1604 Pcs
LM2576HVT-ADJ/NOPB	Texas Instruments	Adjustable	1.23V - 57V	3A	4V / 60V	TO-220-5	Active	15746 Pcs
LM2575HVT-ADJ/NOPB	Texas Instruments	Adjustable	1.23V - 57V	1A	4V / 60V	TO-220-5	Active	22615 Pcs
LM2575HVT-12/NOPB	Texas Instruments	Fixed	12V	1A	4V / 60V	TO-220-5	Active	4311 Pcs
LM2575HVT-15/NOPB	Texas Instruments	Fixed	15V	1A	4V / 60V	TO-220-5	Active	4504 Pcs
LM2575HVT-3.3/NOPB	National Semiconductor	Fixed	3.3V	1A	4V / 60V	TO-220-5	Active	6300 Pcs
LM2575HVT-5.0/NOPB	Texas Instruments	Fixed	5V	1A	4V / 60V	TO-220-5	Active	4625 Pcs
LM2575T-12/NOPB	Texas Instruments	Fixed	12V	1A	4V / 40V	TO-220-5	Active	51832 Pcs
LM2575T-15/NOPB	Texas Instruments	Fixed	15V	1A	4V / 40V	TO-220-5	Active	5300 Pcs
LM2575T-3.3/NOPB	Texas Instruments	Fixed	3.3V	1A	4V / 40V	TO-220-5	Active	6200 Pcs
LM2575T-5.0/NOPB	Texas Instruments	Fixed	5V	1A	4V / 40V	TO-220-5	Active	10200 Pcs

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute): LM2576HVT-ADJ/NOPB is the direct equivalent with identical electrical specifications and Active product status. This part maintains full compatibility with the original LM2576HVT-ADJ design. The /NOPB suffix indicates lead-free plating, meeting ROHS3 compliance requirements. Inventory availability is significantly higher (15746 Pcs), ensuring supply continuity.

Adjustable Output Alternative (Current-Limited): LM2575HVT-ADJ/NOPB provides adjustable output voltage capability with identical input voltage range (4V to 60V) but reduced output current to 1A. This substitute is suitable for applications where 1A output current is sufficient. Active product status and high inventory (22615 Pcs) support long-term availability.

Fixed Output Alternatives (HVT Series): LM2575HVT fixed-output variants (12V, 15V, 3.3V, 5.0V) maintain the full 60V input voltage rating and 1A output current. These are suitable only when the application requires the specific fixed output voltage. All HVT variants support the extended input voltage range critical for high-input-voltage designs.

Fixed Output Alternatives (Standard Temperature Series): LM2575T variants reduce maximum input voltage to 40V. These parts are suitable only for applications where input voltage does not exceed 40V. Higher inventory levels for certain LM2575T variants (LM2575T-12/NOPB: 51832 Pcs) may provide cost advantages in high-volume procurement.

Compliance and Certification: All recommended substitutes maintain ROHS3 compliance, EAR99 export classification, and identical HTSUS coding. Moisture sensitivity level remains MSL 1 (Unlimited) across all variants, eliminating moisture-related handling constraints.

Frequently Asked Questions (FAQ)

Q: Can LM2576HVT-ADJ be directly replaced with LM2576HVT-ADJ/NOPB? A: Yes. These parts are electrically and mechanically identical. The /NOPB designation indicates lead-free plating. Both meet ROHS3 compliance. The /NOPB variant has superior inventory availability and Active product status.

Q: What is the difference between LM2576HVT-ADJ and LM2575HVT-ADJ? A: The primary difference is output current rating: LM2576HVT-ADJ delivers 3A, while LM2575HVT-ADJ delivers 1A. Both provide adjustable output voltage (1.23V to 57V) and support 4V to 60V input range. The LM2575 variant is suitable only for applications requiring 1A or less output current.

Q: Can I use a fixed-output LM2575HVT variant instead of the adjustable LM2576HVT-ADJ? A: Only if your application requires the specific fixed output voltage provided by that variant (12V, 15V, 3.3V, or 5.0V). Fixed-output parts eliminate the need for external resistor dividers but sacrifice output voltage flexibility. All fixed-output HVT variants maintain the 60V input voltage rating.

Q: What is the significance of the HVT designation? A: HVT indicates high-voltage tolerance, supporting input voltage up to 60V. Standard temperature variants (LM2575T) limit input voltage to 40V. Select HVT variants for applications exceeding 40V input voltage.

Q: Are there thermal or package differences between substitute parts? A: All listed substitutes use identical TO-220-5 package. Operating temperature range remains -40°C to 125°C across all variants. Thermal performance is equivalent within the same current rating class.

Q: Why is LM2576HVT-ADJ marked as Last Time Buy? A: Last Time Buy status indicates production discontinuation. LM2576HVT-ADJ/NOPB (Active status) is the recommended long-term replacement, offering identical specifications with continued manufacturing support.

Q: Can LM2575T variants be used in place of LM2575HVT variants? A: Only if your application input voltage does not exceed 40V. LM2575T parts are not suitable for designs requiring the full 60V input voltage range supported by HVT variants.

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