LM2596S-5.0 Buck Switching Regulator IC Equivalent & Substitute Parts

Part Overview

The LM2596S-5.0 is a buck switching regulator IC manufactured by Texas Instruments, designed for step-down voltage conversion with a fixed 5V output and 3A current capacity. This device operates across a wide input voltage range of 4.5V to 40V and is housed in a TO-263-6 (D2PAK) surface mount package. The part is currently in Last Time Buy status, indicating production discontinuation. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability for applications requiring 5V regulated power conversion.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM2596S-5.0
Category	Power Management (PMIC)
Function	Step-Down (Buck)
Output Type	Fixed 5V
Output Current	3A
Input Voltage Range	4.5V to 40V
Switching Frequency	150kHz
Package	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature	-40°C to 125°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitute parts for the LM2596S-5.0 are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Output voltage: Fixed 5V
Output current capability: 3A or higher
Input voltage range: Minimum 4.5V, maximum 40V or greater
Package type: TO-263-6 / D2PAK (5 Leads + Tab)
Topology: Buck (step-down) configuration
Operating temperature range: -40°C to 125°C or compatible

Secondary Compatibility Factors:

Switching frequency (150kHz for LM2596S-5.0; 52kHz acceptable for lower-frequency alternatives)
Synchronous rectifier capability (not required)
Moisture sensitivity level and RoHS compliance

Parts are categorized into two groups: direct equivalents with identical electrical specifications and functional alternatives with compatible but different electrical characteristics that maintain design compatibility.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Min)	Input Voltage (Max)	Switching Frequency	Package	Product Status	Packaging Type
LM2596S-5.0	Texas Instruments	3A	4.5V	40V	150kHz	TO-263-6	Last Time Buy	Tube
LM2596S-5.0/NOPB	Texas Instruments	3A	4.5V	40V	150kHz	TO-263-6	Active	Tube
LM2575-5.0WU	Microchip Technology	1A	4V	40V	52kHz	TO-263-6	Active	Tube
LM2575-5.0WU-TR	Microchip Technology	1A	4V	40V	52kHz	TO-263-6	Active	Tape & Reel
LM2575D2T-5G	onsemi	1A	4.75V	40V	52kHz	TO-263-6	Active	Tube
LM2575D2T-5R4G	onsemi	1A	4.75V	40V	52kHz	TO-263-6	Active	Cut Tape & Digi-Reel
LM2576D2T-005G	onsemi	3A	7V	40V	52kHz	TO-263-6	Active	Tube
LM2576D2TR4-5G	onsemi	3A	7V	40V	52kHz	TO-263-6	Active	Cut Tape & Digi-Reel
LM2596DSADJG	onsemi	3A	4.5V	40V	150kHz	TO-263-6	Active	Tube
MIC4576-5.0WU-TR	Microchip Technology	3A	4V	36V	200kHz	TO-263-6	Active	Tape & Reel
NCV2575D2T-5R4G	onsemi	1A	4.75V	40V	52kHz	TO-263-6	Obsolete	Tape & Reel

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute): LM2596S-5.0/NOPB (Texas Instruments) is the direct equivalent with identical electrical specifications, switching frequency, and package configuration. This part maintains Active product status and is the preferred choice for design continuity. It provides the same 3A output current, 150kHz switching frequency, and 4.5V to 40V input range as the original LM2596S-5.0.

Full-Specification Alternatives (3A Output Current): LM2576D2T-005G and LM2576D2TR4-5G (onsemi) provide 3A output current matching the original part. These devices operate at 52kHz switching frequency and require a minimum input voltage of 7V, making them suitable for applications where input voltage remains above 7V. Both parts are in Active status and ROHS3 compliant.

LM2596DSADJG (onsemi) matches the input voltage range (4.5V to 40V) and switching frequency (150kHz) of the original part with 3A output capability. This part features adjustable output voltage configuration, providing design flexibility beyond the fixed 5V output of the LM2596S-5.0.

MIC4576-5.0WU-TR (Microchip Technology) delivers 3A output current with fixed 5V output and operates at 200kHz switching frequency. Input voltage range is 4V to 36V. This part is Active and ROHS3 compliant, available in Tape & Reel packaging.

Lower-Current Alternatives (1A Output Current): LM2575-5.0WU, LM2575-5.0WU-TR, LM2575D2T-5G, and LM2575D2T-5R4G (Microchip Technology and onsemi) provide 1A output current at 52kHz switching frequency. These parts are suitable only for applications where load current does not exceed 1A. All are in Active status and ROHS3 compliant.

NCV2575D2T-5R4G (onsemi) is marked Obsolete and should be avoided for new designs despite meeting electrical specifications.

Compliance and Certification: All recommended substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the original LM2596S-5.0 certifications. Operating temperature ranges are -40°C to 125°C (TJ) or -40°C to 85°C (TA), depending on the specific part.

Frequently Asked Questions (FAQ)

Q: Can I use LM2575 series parts as direct replacements for the LM2596S-5.0? A: LM2575 series parts are not direct replacements due to reduced output current (1A versus 3A). They are suitable only for applications with maximum load current of 1A. Additionally, LM2575 devices operate at 52kHz switching frequency compared to the LM2596S-5.0's 150kHz, which may affect circuit performance and component sizing.

Q: What is the difference between LM2576D2T-005G and LM2596S-5.0? A: Both devices provide 3A output current and fixed 5V output in identical TO-263-6 packages. The primary difference is minimum input voltage: LM2576D2T-005G requires 7V minimum, while LM2596S-5.0 operates from 4.5V. The LM2576 operates at 52kHz versus 150kHz for the LM2596S-5.0. Select LM2576 only if your application input voltage remains above 7V.

Q: Is LM2596DSADJG compatible with my fixed 5V design? A: LM2596DSADJG is electrically compatible and can be configured for fixed 5V output through external resistor networks. However, this part features adjustable output voltage capability, requiring additional design consideration. It matches the input voltage range and switching frequency of the original LM2596S-5.0 and provides identical 3A output current.

Q: What packaging options are available for substitute parts? A: Substitute parts are available in Tube, Tape & Reel (TR), and Cut Tape & Digi-Reel packaging. Tube packaging is standard for lower-volume applications. Tape & Reel and Cut Tape & Digi-Reel options are available for high-volume manufacturing. Package selection does not affect electrical performance.

Q: Why is NCV2575D2T-5R4G listed as Obsolete? A: NCV2575D2T-5R4G is marked Obsolete by the manufacturer, indicating discontinued production and limited future availability. This part should not be selected for new designs. Active alternatives such as LM2575D2T-5R4G (onsemi) or LM2575-5.0WU-TR (Microchip Technology) are recommended instead.

Q: Can I use MIC4576-5.0WU-TR if my application requires operation above 36V input? A: No. MIC4576-5.0WU-TR is rated for maximum input voltage of 36V, compared to 40V for the LM2596S-5.0. Applications requiring input voltages between 36V and 40V must use LM2596S-5.0/NOPB, LM2576 series, or LM2596DSADJG instead.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All recommended substitute parts listed maintain ROHS3 compliance and REACH Unaffected status, matching the original LM2596S-5.0 environmental certifications.

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