LM2650M-ADJ Buck Switching Regulator IC

Part Overview

The LM2650M-ADJ is a buck switching regulator IC manufactured by Texas Instruments, designed for positive adjustable output voltage regulation with 3A output current capability. This device operates as a step-down converter with a single adjustable output, suitable for applications requiring input voltages between 4.5V and 18V with output voltage adjustment from 1.5V to 16V.

The LM2650M-ADJ carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for existing applications and new designs requiring this functional specification.

Substiute Parts

LM2650M-ADJ

Texas InstrumentsIn Stock: 4624LM2650M-ADJ Datasheet

Current PartRFQ

LM2650M-ADJ/NOPB

National SemiconductorIn Stock: 1130LM2650M-ADJ/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2650M-ADJ are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Function: Step-Down (Buck) topology
• Output Configuration: Positive Adjustable
• Number of Outputs: Single output
• Input Voltage Range: 4.5V to 18V minimum
• Output Voltage Range: 1.5V to 16V adjustable capability
• Output Current: 3A minimum
• Switching Frequency: 90kHz
• Synchronous Rectifier: Present
• Operating Temperature Range: -40°C to 125°C
• Package: 24-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount

Substitute parts must match all critical parameters to ensure functional and mechanical compatibility with existing PCB designs and application requirements.

Parameter Comparison

Engineering Selection Recommendations

The LM2650M-ADJ/NOPB serves as a direct functional substitute for the LM2650M-ADJ. Both parts share identical electrical specifications and package configuration, ensuring pin-for-pin compatibility and functional equivalence in circuit applications.

The primary distinction between these parts is product status: the original LM2650M-ADJ is classified as obsolete, while the LM2650M-ADJ/NOPB maintains active product status. The "/NOPB" suffix indicates lead-free (Pb-free) compliance, reflecting modern manufacturing standards.

For new designs and applications requiring long-term component availability, the LM2650M-ADJ/NOPB is the appropriate selection. For existing designs currently using the LM2650M-ADJ, direct substitution with the LM2650M-ADJ/NOPB is supported without circuit modification, provided that lead-free solder compatibility has been verified for the target PCB assembly process.

Frequently Asked Questions (FAQ)

Q: Can the LM2650M-ADJ/NOPB be used as a direct replacement for the LM2650M-ADJ?

A: Yes. Both parts are electrically and mechanically identical. The LM2650M-ADJ/NOPB features lead-free (Pb-free) construction and maintains active product status, making it suitable for direct substitution in existing designs.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" designation indicates that the component is manufactured without lead (Pb-free), complying with RoHS and modern environmental standards.

Q: Are there any package or pinout differences between these parts?

A: No. Both the LM2650M-ADJ and LM2650M-ADJ/NOPB use the 24-SOIC (0.295", 7.50mm Width) package with identical pinout and mechanical dimensions. PCB designs require no modification for substitution.

Q: Why is the original LM2650M-ADJ marked as obsolete?

A: Product obsolescence typically reflects manufacturer discontinuation decisions. The LM2650M-ADJ/NOPB represents the current active equivalent, incorporating lead-free manufacturing standards.

Q: What are the critical parameters that define substitution eligibility for this part?

A: Substitutes must match the following: 3A output current, 90kHz switching frequency, adjustable output voltage from 1.5V to 16V, input voltage range of 4.5V to 18V, 24-SOIC package, and operating temperature range of -40°C to 125°C.

Q: Is the LM2650M-ADJ/NOPB compatible with existing PCB assembly processes?

A: Lead-free components require solder reflow profiles optimized for lead-free solder alloys. Verify that your PCB assembly process supports lead-free component soldering before implementation.