LM2595S-3.3 Buck Switching Regulator Equivalent & Substitute Parts

Part Overview

The LM2595S-3.3 is a buck switching regulator IC from Texas Instruments, part of the SIMPLE SWITCHER® series. It delivers a fixed 3.3V output at 1A from input voltages ranging from 4.5V to 40V, operating at 150kHz switching frequency. The device is housed in a TO-263-6 (D2PAK) surface mount package with 5 leads plus tab.

The main part number LM2595S-3.3 carries a Last Time Buy status, indicating production discontinuation. Equivalent and substitute parts are necessary to ensure design continuity and long-term component availability for new production runs and ongoing support.

Substiute Parts

LM2595S-3.3

Texas InstrumentsIn Stock: 6712LM2595S-3.3 Datasheet

Current PartRFQ

LM2595S-3.3/NOPB

Texas InstrumentsIn Stock: 1727LM2595S-3.3/NOPB Datasheet

MFR RecommendedRFQ

LM2576D2TR4-3.3G

onsemiIn Stock: 2742LM2576D2TR4-3.3G Datasheet

MFR RecommendedRFQ

MIC4576-3.3WU

Microchip TechnologyIn Stock: 4001MIC4576-3.3WU Datasheet

MFR RecommendedRFQ

MIC4576-3.3WU-TR

Microchip TechnologyIn Stock: 3498MIC4576-3.3WU-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2595S-3.3 is determined by the following criteria:

Critical Parameters (Must Match):

• Output voltage: 3.3V fixed
• Package type: TO-263-6 (D2PAK, 5 Leads + Tab)
• Topology: Buck (step-down)
• Output configuration: Positive
• Mounting type: Surface mount
• RoHS compliance: ROHS3 Compliant

Flexible Parameters (May Exceed Specification):

• Output current: 1A minimum (higher ratings acceptable)
• Input voltage range: 4.5V to 40V minimum (wider ranges acceptable)
• Switching frequency: 150kHz nominal (variations acceptable within design tolerance)
• Operating temperature: -40°C to 125°C minimum (wider ranges acceptable)

Substitute parts must maintain electrical and mechanical compatibility while meeting or exceeding the original part's performance envelope. All listed substitutes share the same fixed 3.3V output, identical package footprint, and positive output configuration.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LM2595S-3.3/NOPB

The LM2595S-3.3/NOPB is the direct equivalent from Texas Instruments. It maintains identical electrical specifications (1A output current, 150kHz switching frequency, -40°C to 125°C operating range) and package configuration. The part carries Active product status, ensuring long-term availability and supply chain stability. This is the preferred choice for designs requiring exact parameter matching and continuity with the original LM2595S-3.3.

Secondary Recommendations: MIC4576-3.3WU and MIC4576-3.3WU-TR

Both Microchip Technology MIC4576-3.3WU variants provide higher output current capability (3A versus 1A) while maintaining the 3.3V fixed output and identical TO-263-6 package. These parts are suitable for applications where increased current headroom is beneficial. The MIC4576-3.3WU operates at -40°C to 85°C, while both variants switch at 200kHz. Input voltage range is 4V to 36V. Both carry Active product status.

Alternative Recommendation: LM2576D2TR4-3.3G

The onsemi LM2576D2TR4-3.3G offers 3A output current and identical package configuration. It operates at a lower switching frequency (52kHz) and requires a minimum input voltage of 7V (versus 4.5V for the LM2595S-3.3). This part is suitable for applications with higher input voltage availability and where lower switching frequency is acceptable. Active product status ensures availability.

All substitute parts maintain ROHS3 compliance and identical package footprints, enabling direct PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use MIC4576-3.3WU as a direct replacement for LM2595S-3.3?

A: Yes, from an electrical and mechanical standpoint. Both deliver 3.3V fixed output in the same TO-263-6 package. The MIC4576-3.3WU provides higher current capability (3A versus 1A) and operates at a different switching frequency (200kHz versus 150kHz). PCB layout and external component values remain compatible. Verify that your application's input voltage range (4V to 36V for MIC4576 versus 4.5V to 40V for LM2595S) and operating temperature requirements (-40°C to 85°C for MIC4576 versus -40°C to 125°C for LM2595S) are satisfied.

Q: What is the difference between LM2595S-3.3 and LM2595S-3.3/NOPB?

A: Both are Texas Instruments parts with identical electrical specifications and package configuration. The primary difference is packaging format: LM2595S-3.3 is supplied in standard packaging, while LM2595S-3.3/NOPB is supplied in Tube packaging. The "/NOPB" designation indicates "No Plumbum" (lead-free) compliance. Electrical performance and PCB compatibility are identical.

Q: Why does LM2576D2TR4-3.3G require a minimum 7V input while LM2595S-3.3 operates from 4.5V?

A: The LM2576D2TR4-3.3G is designed with different internal circuitry and switching characteristics optimized for higher input voltage applications. If your design operates below 7V input, this part is not suitable. Verify your actual input voltage range before selection.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original LM2595S-3.3 specification.

Q: Can I use a higher current-rated part (3A) in place of the 1A LM2595S-3.3?

A: Yes. Higher current-rated regulators are electrically compatible and provide additional design margin. The 3A variants (MIC4576-3.3WU, MIC4576-3.3WU-TR, LM2576D2TR4-3.3G) will operate correctly in circuits designed for 1A output. No circuit modifications are required. This substitution is particularly useful for applications requiring future current expansion or improved thermal performance.

Q: What is the significance of the Last Time Buy status on LM2595S-3.3?

A: Last Time Buy indicates that Texas Instruments has discontinued production of this part number. Existing inventory may be available, but no new production runs are planned. For new designs or long-term production requirements, selection of an Active status part (LM2595S-3.3/NOPB, MIC4576-3.3WU variants, or LM2576D2TR4-3.3G) is recommended to ensure supply chain continuity.