LM5115SD Equivalent & Substitute Parts

Part Overview

The LM5115SD is a secondary-side power supply controller manufactured by Texas Instruments, designed for isolated power conversion applications. It operates with input voltage ranging from 5V to 30V and supply voltage of 5V to 7.5V, housed in a 16-WSON (5x5) surface mount package. The device is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

LM5115SD

Texas InstrumentsIn Stock: 976LM5115SD Datasheet

Current PartRFQ

LM5115SD/NOPB

National SemiconductorIn Stock: 3408LM5115SD/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM5115SD is determined by strict equivalence across the following critical parameters:

• Functional Classification: Secondary-side power supply controller
• Package Type: 16-WSON (5x5) with exposed pad
• Input Voltage Range: 5V ~ 30V
• Supply Voltage Range: 5V ~ 7.5V
• Supply Current: 4 mA
• Operating Temperature Range: -40°C ~ 125°C
• Mounting Technology: Surface mount

The LM5115SD/NOPB qualifies as a direct substitute based on identical electrical specifications and package configuration. The primary distinction is product status: the original LM5115SD is obsolete, while LM5115SD/NOPB maintains active status with higher inventory availability.

Parameter Comparison

Engineering Selection Recommendations

The LM5115SD/NOPB is the direct equivalent for the obsolete LM5115SD. Selection between these parts should be based on the following factors:

For Legacy System Support: The LM5115SD remains available with 882 pieces in stock. This option is suitable for repair and maintenance of existing systems where the original part number must be preserved for documentation and traceability.

For New Designs and Replenishment: The LM5115SD/NOPB is the preferred choice. It maintains active product status, offers superior inventory availability (3300 pieces), and provides identical electrical and mechanical specifications. This part is suitable for production builds and long-term supply chain planning.

Both parts comply with identical electrical parameters and package specifications, ensuring direct pin-for-pin and functional compatibility. The choice between them is driven by product lifecycle status and inventory requirements rather than technical performance differences.

Frequently Asked Questions (FAQ)

Q: Can LM5115SD/NOPB be used as a direct replacement for LM5115SD?

A: Yes. Both parts are electrically and mechanically identical. They share the same input voltage range (5V ~ 30V), supply voltage (5V ~ 7.5V), supply current (4 mA), operating temperature range (-40°C ~ 125°C), and 16-WSON (5x5) package configuration. The primary difference is product status: LM5115SD is obsolete while LM5115SD/NOPB is active.

Q: What is the significance of the /NOPB suffix?

A: The /NOPB designation indicates the part is supplied without plumbum (lead-free). This is a packaging and compliance designation that does not affect electrical performance or functional compatibility.

Q: Are there any differences in RoHS compliance between these parts?

A: The provided specifications indicate the LM5115SD is RoHS non-compliant. Compliance information for LM5115SD/NOPB is not provided in the available data. Verify RoHS status with the supplier if compliance is a requirement for your application.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: The LM5115SD has an MSL rating of 1 (Unlimited), indicating the lowest moisture sensitivity. This allows extended storage without desiccant packaging. MSL information for LM5115SD/NOPB is not provided in the available data.

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. Both parts use identical 16-WSON (5x5) surface mount packages with exposed pads. They require identical PCB footprints, solder reflow profiles, and assembly processes. No design modifications are necessary for substitution.

Q: Which part should be selected for a new production design?

A: LM5115SD/NOPB is recommended for new designs. It maintains active product status and offers higher inventory availability, ensuring better long-term supply chain stability and production continuity.