LM2576D2T-3.3 Equivalent & Substitute Parts

Part Overview

The LM2576D2T-3.3 is a buck switching regulator IC manufactured by onsemi, designed for positive or negative fixed 3.3V output at 3A current capacity. The device operates across a 7V to 40V input voltage range with a 52kHz switching frequency and is housed in a TO-263-6 D2PAK package with 5 leads plus tab.

The LM2576D2T-3.3 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications requiring 3.3V buck regulation at 3A output capacity.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Voltage	3.3V Fixed
Output Current	3A
Input Voltage Range	7V 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
Synchronous Rectifier	No

Substitute Part Grouping Explanation

Substitution eligibility for the LM2576D2T-3.3 is determined by the following critical parameters:

Output voltage: 3.3V fixed
Output current capacity: 3A minimum
Package type: TO-263-6 D2PAK (5 Leads + Tab)
Topology: Buck switching regulator
Operating temperature range: -40°C to 125°C (TJ)
Switching frequency: 52kHz (compatible range acceptable)

Substitute parts must maintain identical output voltage and package configuration. Output current capacity must meet or exceed 3A. Input voltage range variations are acceptable provided the minimum input voltage supports the application requirements. Switching frequency variations within the buck regulator class are acceptable for functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Min-Max)	Switching Frequency	Package	Product Status	RoHS Status
LM2576D2T-3.3	onsemi	3.3V	3A	7V - 40V	52kHz	TO-263-6 D2PAK	Obsolete	Non-compliant
LM2576-3.3WU	Microchip Technology	3.3V	3A	4V - 40V	52kHz	TO-263-6 D2PAK	Active	ROHS3 Compliant
LM2576-3.3WU-TR	Microchip Technology	3.3V	3A	4V - 40V	52kHz	TO-263-6 D2PAK	Active	ROHS3 Compliant
LM2592HVS-3.3/NOPB	Texas Instruments	3.3V	2A	4.5V - 60V	150kHz	TO-263-6 D2PAK	Active	ROHS3 Compliant
LM2592HVSX-3.3/NOPB	Texas Instruments	3.3V	2A	4.5V - 60V	150kHz	TO-263-6 D2PAK	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (3A Output Current)

The LM2576-3.3WU and LM2576-3.3WU-TR from Microchip Technology provide direct functional equivalence to the LM2576D2T-3.3. Both devices deliver 3A output current at 3.3V with identical 52kHz switching frequency and TO-263-6 D2PAK packaging. Both are active products with ROHS3 compliance. The primary difference is packaging format: LM2576-3.3WU is supplied in tube packaging, while LM2576-3.3WU-TR is supplied in tape and reel format. Selection between these variants depends on assembly process requirements and inventory management practices.

Alternative Consideration (2A Output Current)

The LM2592HVS-3.3/NOPB and LM2592HVSX-3.3/NOPB from Texas Instruments are active products with ROHS3 compliance and identical TO-263-6 D2PAK packaging. These devices deliver 2A output current, which is below the 3A specification of the original part. These alternatives are suitable only for applications where the load current requirement does not exceed 2A. Both devices feature higher switching frequency (150kHz) and extended input voltage range (4.5V to 60V).

All recommended substitutes maintain the required operating temperature range of -40°C to 125°C (TJ) and surface mount configuration.

Frequently Asked Questions (FAQ)

Q: Can the LM2576-3.3WU directly replace the LM2576D2T-3.3?

A: Yes. The LM2576-3.3WU provides direct functional equivalence. Both devices deliver 3A at 3.3V output with identical 52kHz switching frequency and TO-263-6 D2PAK packaging. The primary difference is that the LM2576D2T-3.3 is obsolete while the LM2576-3.3WU is an active product with ROHS3 compliance.

Q: What is the difference between LM2576-3.3WU and LM2576-3.3WU-TR?

A: Both parts are electrically identical with 3A output current at 3.3V. The difference is packaging format: LM2576-3.3WU is supplied in tube packaging, while LM2576-3.3WU-TR is supplied in tape and reel format. Selection depends on assembly process requirements and volume handling.

Q: Can I use the LM2592HVS-3.3/NOPB as a substitute?

A: The LM2592HVS-3.3/NOPB is electrically compatible in terms of output voltage (3.3V) and package type (TO-263-6 D2PAK). However, it delivers only 2A output current compared to the 3A specification of the LM2576D2T-3.3. This substitute is suitable only for applications where load current does not exceed 2A.

Q: Are there RoHS compliance differences between the original part and substitutes?

A: Yes. The LM2576D2T-3.3 is RoHS non-compliant. The recommended Microchip Technology substitutes (LM2576-3.3WU and LM2576-3.3WU-TR) and Texas Instruments alternatives (LM2592HVS-3.3/NOPB and LM2592HVSX-3.3/NOPB) are all ROHS3 compliant.

Q: Does switching frequency affect substitution compatibility?

A: Switching frequency differences do not prevent functional substitution for buck regulator applications. The original LM2576D2T-3.3 operates at 52kHz. The LM2576-3.3WU maintains 52kHz operation. The LM2592 series operates at 150kHz. Higher switching frequency reduces output filter size but does not affect voltage regulation or output current capacity.

Q: What is the minimum input voltage requirement for substitutes?

A: The original LM2576D2T-3.3 requires minimum 7V input. The Microchip LM2576-3.3WU operates from 4V minimum input. The Texas Instruments LM2592 series operates from 4.5V minimum input. All substitutes support the original 40V maximum input specification or higher.

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