LM2596T-ADJ Buck Switching Regulator Equivalent & Substitute Parts

Part Overview

The LM2596T-ADJ is a buck switching regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This positive adjustable step-down regulator delivers 3A output current with an adjustable output voltage range from 1.2V to 37V, operating from a 4.5V to 40V input supply. The device operates at 150kHz switching frequency and is housed in a TO-220-5 formed leads package for through-hole mounting.

The LM2596T-ADJ carries a Last Time Buy product status, indicating that Texas Instruments has discontinued active production. This status necessitates identification of equivalent substitute parts to ensure design continuity and procurement availability for new builds and ongoing production requirements.

Substiute Parts

LM2596T-ADJ

Texas InstrumentsIn Stock: 20134LM2596T-ADJ Datasheet

Current PartRFQ

LM2596T-ADJ/NOPB

Texas InstrumentsIn Stock: 10085LM2596T-ADJ/NOPB Datasheet

MFR RecommendedRFQ

LM2596TVADJG

onsemiIn Stock: 5315LM2596TVADJG Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2596T-ADJ is determined by the following critical parameters:

• Input voltage range: 4.5V to 40V
• Output voltage range: Adjustable from minimum 1.2V to 37V
• Output current capability: 3A
• Switching frequency: 150kHz
• Package type: TO-220-5 Formed Leads
• Mounting configuration: Through Hole
• Output configuration: Positive
• Topology: Buck (Step-Down)

Substitute parts must match or exceed these specifications across all critical electrical parameters. Packaging and mounting type must be identical to ensure direct board-level compatibility without redesign.

Parameter Comparison

Engineering Selection Recommendations

LM2596T-ADJ/NOPB (Texas Instruments - Recommended Manufacturer Substitute)

The LM2596T-ADJ/NOPB is the direct manufacturer substitute from Texas Instruments. This part carries Active product status, ensuring ongoing availability and supply chain stability. It matches all electrical parameters identically to the LM2596T-ADJ and maintains the same TO-220-5 package configuration. The primary distinction is packaging format (Tube vs. unspecified for the original), which does not affect electrical performance or board-level compatibility. This part is ROHS3 compliant and carries REACH Unaffected status, meeting current regulatory requirements.

LM2596TVADJG (onsemi - Direct Manufacturer Substitute)

The LM2596TVADJG from onsemi provides an alternative source for buck regulator functionality. This part maintains electrical compatibility across all critical parameters: 4.5V to 40V input range, 3A output current, 150kHz switching frequency, and TO-220-5 package. The onsemi device offers expanded topology flexibility, supporting buck, boost, and buck-boost configurations with positive or negative output options, though buck-positive operation matches the LM2596T-ADJ specification. Output voltage minimum is 1.23V versus 1.2V, representing a negligible 0.03V difference within typical application tolerances. Active product status ensures supply availability. ROHS3 compliance and REACH Unaffected status confirm regulatory alignment.

Both substitutes are electrically and mechanically compatible with the LM2596T-ADJ for applications requiring positive buck regulation within the specified voltage and current parameters.

Frequently Asked Questions (FAQ)

Q: Can the LM2596T-ADJ/NOPB be used as a direct replacement for LM2596T-ADJ?

A: Yes. The LM2596T-ADJ/NOPB is the manufacturer-recommended substitute from Texas Instruments. All electrical parameters are identical, and the TO-220-5 package ensures direct board-level compatibility without circuit modification.

Q: What is the difference between LM2596T-ADJ and LM2596T-ADJ/NOPB?

A: The primary difference is packaging format. The LM2596T-ADJ/NOPB is supplied in Tube packaging, while the original part number does not specify packaging type. Electrically and functionally, both parts are identical. The "/NOPB" suffix indicates "No Plumbum" (lead-free) compliance.

Q: Is the LM2596TVADJG from onsemi compatible with LM2596T-ADJ applications?

A: Yes, for buck (step-down) positive output applications. The LM2596TVADJG matches all critical electrical parameters: input voltage range (4.5V–40V), output current (3A), switching frequency (150kHz), and package type (TO-220-5). The onsemi device supports additional topologies (boost and buck-boost), but when configured for buck operation with positive output, it is electrically equivalent to the LM2596T-ADJ.

Q: What is the significance of the 1.23V versus 1.2V minimum output voltage difference?

A: The LM2596TVADJG has a minimum adjustable output voltage of 1.23V compared to 1.2V for the LM2596T-ADJ. This 0.03V difference is negligible for most applications and falls within typical voltage regulation tolerances. Applications requiring output voltages below 1.23V would require the LM2596T-ADJ or LM2596T-ADJ/NOPB.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both the LM2596T-ADJ/NOPB and LM2596TVADJG are ROHS3 compliant and carry REACH Unaffected status, meeting current environmental and regulatory requirements.

Q: Can I use the LM2596TVADJG in boost or buck-boost mode as a substitute?

A: The LM2596TVADJG supports boost and buck-boost topologies, but these configurations are not equivalent to the LM2596T-ADJ, which is specified for buck (step-down) operation only. Use the LM2596TVADJG only in buck-positive mode for direct substitution.

Q: What is the inventory status of these substitute parts?

A: LM2596T-ADJ/NOPB has 9,977 pieces in stock. LM2596TVADJG has 5,300 pieces in stock. Both parts are available for immediate procurement.