LM2575D2T-3.3G Equivalent & Substitute Parts

Part Overview

The LM2575D2T-3.3G is a buck switching regulator IC manufactured by onsemi, delivering a fixed 3.3V output at 1A from input voltages ranging from 4.75V to 40V. This device operates in the D2PAK-5 (TO-263-6) surface mount package with a switching frequency of 52kHz and supports operating temperatures from -40°C to 125°C. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Voltage	3.3V Fixed
Output Current	1A
Input Voltage Range	4.75V to 40V
Switching Frequency	52kHz
Package Type	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature	-40°C to 125°C (TJ)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the LM2575D2T-3.3G is determined by the following critical parameters:

Output voltage specification (3.3V fixed)
Output current capability (minimum 1A)
Input voltage range compatibility (4.75V to 40V minimum)
Package compatibility (TO-263-6, D2PAK format)
Operating temperature range (-40°C to 125°C)
Topology (buck converter, positive output)

Substitute parts are grouped into three categories based on these criteria:

Direct Equivalents (Same Current Rating): Parts with 1A output current rating in compatible packages.

Higher Current Alternatives (3A Rating): Parts with 3A output current capability, suitable for designs requiring additional current margin or future scaling.

Enhanced Performance Alternatives (2A Rating): Parts with 2A output current and extended input voltage range, offering improved performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Min)	Input Voltage (Max)	Switching Frequency	Package	Status
LM2575D2T-3.3G	onsemi	1A	4.75V	40V	52kHz	TO-263-6, D2PAK-5	Obsolete
LM2575D2T-3.3R4G	onsemi	1A	4.75V	40V	52kHz	TO-263-6, D2PAK-5	Active
TL2575-33IKTTR	Texas Instruments	1A	4.75V	40V	52kHz	TO-263-6, D2PAK-5	Active
LM2575-3.3WU-TR	Microchip Technology	1A	4V	40V	52kHz	TO-263-6, D2PAK-5	Active
LM2576-3.3WU-TR	Microchip Technology	3A	4V	40V	52kHz	TO-263-6, D2PAK-5	Active
LM2592HVS-3.3/NOPB	Texas Instruments	2A	4.5V	60V	150kHz	TO-263-6, D2PAK-5	Active
LM2596S-3.3/NOPB	Texas Instruments	3A	4.5V	40V	150kHz	TO-263-6, D2PAK-5	Active
MIC4576-3.3WU	Microchip Technology	3A	4V	36V	200kHz	TO-263-6, D2PAK-5	Active

Engineering Selection Recommendations

Primary Recommendation: LM2575D2T-3.3R4G (onsemi)

This part is the direct successor to the obsolete LM2575D2T-3.3G, maintaining identical electrical specifications and package format. It is active in production status and ROHS3 compliant, making it the preferred choice for direct replacement without design modification.

Secondary Recommendation: TL2575-33IKTTR (Texas Instruments)

This part matches all critical parameters of the original device and is active in production. It provides equivalent functionality with ROHS3 compliance and is available in tape and reel packaging for production environments.

Alternative for Higher Current Requirements: LM2576-3.3WU-TR (Microchip Technology)

When designs require additional current margin or future scaling beyond 1A, this 3A-rated part maintains the same 3.3V output, 52kHz switching frequency, and package format. It is ROHS3 compliant and active in production.

Alternative for Extended Input Range: LM2592HVS-3.3/NOPB (Texas Instruments)

This part supports input voltages up to 60V (compared to 40V maximum for the original), making it suitable for applications requiring higher input voltage tolerance. It delivers 2A output current and operates at 150kHz switching frequency. ROHS3 compliant and active in production.

All recommended substitutes are ROHS3 compliant and carry REACH Unaffected status, meeting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM2575D2T-3.3G with LM2575D2T-3.3R4G?

A: Yes. LM2575D2T-3.3R4G is the active production equivalent with identical electrical specifications, output voltage (3.3V), current rating (1A), input voltage range (4.75V to 40V), switching frequency (52kHz), and package format (TO-263-6, D2PAK-5). No design changes are required.

Q: What is the difference between the 1A and 3A rated parts?

A: The 3A-rated parts (LM2576-3.3WU-TR, LM2596S-3.3/NOPB, MIC4576-3.3WU) deliver higher maximum output current while maintaining the same 3.3V output voltage and package compatibility. They are suitable for designs requiring current levels between 1A and 3A or for applications needing additional thermal margin.

Q: Are all substitute parts pin-compatible?

A: All listed substitutes use the TO-263-6, D2PAK (5 Leads + Tab) package format with identical pinout, ensuring direct PCB compatibility without layout modifications.

Q: What is the impact of different switching frequencies?

A: The original LM2575D2T-3.3G operates at 52kHz. Substitutes like LM2592HVS-3.3/NOPB (150kHz) and MIC4576-3.3WU (200kHz) operate at higher frequencies, which may affect output filter design and EMI characteristics. Higher switching frequencies typically allow for smaller external components but may require filter optimization.

Q: Which substitute offers the widest input voltage range?

A: LM2592HVS-3.3/NOPB supports input voltages from 4.5V to 60V, providing the widest input range among all listed substitutes. This makes it suitable for applications with variable or high input voltage sources.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All active production substitutes listed carry ROHS3 compliance status and REACH Unaffected designation, meeting current regulatory requirements for electronic components.

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