LM2596S-ADJ Equivalent & Substitute Parts

Part Overview

The LM2596S-ADJ is a buck switching regulator IC from Texas Instruments, part of the SIMPLE SWITCHER® series. It provides positive adjustable output voltage regulation with 3A output current capability in a TO-263-6 (D2PAK) surface mount package. The main part number is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Configuration	Positive
Output Type	Adjustable
Voltage - Input (Min/Max)	4.5V to 40V
Voltage - Output (Min/Max)	1.2V to 37V
Current - Output	3A
Frequency - Switching	150kHz
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature	-40°C to 125°C (TJ)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the LM2596S-ADJ are qualified based on the following critical parameters:

Topology & Function: Buck (step-down) switching regulator topology
Output Characteristics: Positive adjustable output voltage
Electrical Performance: 3A output current, 150kHz switching frequency
Input Voltage Range: 4.5V to 40V
Output Voltage Range: Minimum 1.2V to 1.23V, maximum 37V
Package Compatibility: TO-263-6 (D2PAK-5) surface mount package
Operating Temperature: -40°C to 125°C

Two substitute parts meet these criteria: LM2596S-ADJ/NOPB (Texas Instruments) and LM2596DSADJG (onsemi). Both maintain identical electrical specifications and package form factor, ensuring direct functional equivalence.

Parameter Comparison

Parameter	LM2596S-ADJ	LM2596S-ADJ/NOPB	LM2596DSADJG
Manufacturer	Texas Instruments	Texas Instruments	onsemi
Function	Step-Down	Step-Down	Step-Up, Step-Down, Step-Up/Step-Down
Output Configuration	Positive	Positive	Positive or Negative
Output Type	Adjustable	Adjustable	Adjustable
Voltage - Input (Min)	4.5V	4.5V	4.5V
Voltage - Input (Max)	40V	40V	40V
Voltage - Output (Min/Fixed)	1.2V	1.2V	1.23V
Voltage - Output (Max)	37V	37V	37V
Current - Output	3A	3A	3A
Frequency - Switching	150kHz	150kHz	150kHz
Package / Case	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

LM2596S-ADJ/NOPB is the primary substitute for the obsolete LM2596S-ADJ. Both are Texas Instruments products with identical electrical specifications and package form factor. The /NOPB variant is actively produced and ROHS3 compliant, addressing the regulatory compliance gap of the original part. Packaging is supplied in tube format.

LM2596DSADJG (onsemi) provides an alternative from a different manufacturer while maintaining electrical equivalence for buck regulator operation. This part offers enhanced moisture sensitivity rating (MSL 1 vs. MSL 3), providing superior reliability in high-humidity storage and assembly environments. The onsemi device supports additional topologies (boost and buck-boost configurations) beyond the buck-only function of the original part, though only buck operation is required for direct substitution.

Both substitutes are actively produced and carry ROHS3 compliance certification, making them suitable for new designs and legacy system support.

Frequently Asked Questions (FAQ)

Q: Can LM2596S-ADJ/NOPB be used as a direct replacement for LM2596S-ADJ?

A: Yes. Both parts share identical electrical specifications, output voltage range (1.2V to 37V), 3A output current, 150kHz switching frequency, and TO-263-6 package. The /NOPB variant is the active production equivalent with ROHS3 compliance.

Q: What is the difference between LM2596S-ADJ/NOPB and LM2596DSADJG?

A: Both provide equivalent buck regulator performance with identical input/output voltage ranges and current ratings. The primary differences are manufacturer (Texas Instruments vs. onsemi) and moisture sensitivity rating (MSL 3 vs. MSL 1). The onsemi part supports additional topologies (boost and buck-boost) not required for buck-only applications.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All three parts use the TO-263-6 (D2PAK-5) surface mount package with identical pinout and thermal characteristics, ensuring direct PCB compatibility without layout modifications.

Q: Why is the original LM2596S-ADJ listed as obsolete?

A: The LM2596S-ADJ has been superseded by the LM2596S-ADJ/NOPB variant, which maintains full electrical equivalence while meeting current RoHS compliance requirements. The /NOPB designation indicates lead-free (no-lead) manufacturing.

Q: Which substitute should be selected for new designs?

A: LM2596S-ADJ/NOPB is recommended for new designs as the direct Texas Instruments equivalent with active production status and ROHS3 compliance. LM2596DSADJG is suitable where onsemi supply chain preference or enhanced moisture sensitivity rating (MSL 1) is required.

Q: Are the output voltage adjustment ranges identical across all three parts?

A: Yes. All three parts support adjustable output voltage from 1.2V to 1.23V minimum to 37V maximum, with identical adjustment circuitry and feedback network requirements.

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