LM5115SDX Equivalent & Substitute Parts

Part Overview

The LM5115SDX 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 from 5V to 7.5V in a 16-WSON surface mount package. The device is currently classified as obsolete, which necessitates identification of equivalent alternatives for ongoing design support and procurement.

Substiute Parts

LM5115SDX

Texas InstrumentsIn Stock: 943LM5115SDX Datasheet

Current PartRFQ

LM5115SDX/NOPB

Texas InstrumentsIn Stock: 681LM5115SDX/NOPB Datasheet

DirectRFQ

TEA1716T/2,518

NXP USA Inc.In Stock: 12174TEA1716T/2,518 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM5115SDX is determined by the following critical parameters:

Primary Substitution Criteria:

• Application function: Secondary-side power supply controller
• Voltage specifications: Input 5V ~ 30V, Supply 5V ~ 7.5V
• Package compatibility: 16-WSON (5x5) form factor
• Mounting type: Surface mount
• Operating temperature range: -40°C ~ 125°C minimum

Identified Substitutes:

1. LM5115SDX/NOPB (Direct Equivalent) — Identical electrical and mechanical specifications with active product status and RoHS3 compliance. Packaging differs only in format (Tape & Reel vs. standard).

2. TEA1716T/2,518 (Functional Alternative) — NXP USA Inc. PFC controller with different application focus (DCM mode PFC vs. secondary-side control). Voltage supply specifications differ significantly (70 ~ 276 VAC vs. 5V ~ 7.5V), indicating this part addresses a different power conversion topology and is not a direct pin-for-pin replacement.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement:

LM5115SDX/NOPB is the appropriate selection when continuing with the LM5115 platform. This part maintains identical electrical specifications and package form factor while offering active product status and RoHS3 compliance. The only distinction is packaging format (Tape & Reel), which does not affect electrical performance or board-level integration.

For Alternative Topology:

TEA1716T/2,518 is not suitable as a direct substitute due to fundamental differences in application (PFC controller vs. secondary-side controller) and voltage supply specifications (70 ~ 276 VAC vs. 5V ~ 7.5V). This part operates in a different power conversion stage and requires complete circuit redesign.

Compliance Considerations:

The LM5115SDX/NOPB provides RoHS3 compliance, addressing regulatory requirements that the original LM5115SDX does not meet. For new designs or procurement requiring environmental compliance, LM5115SDX/NOPB is the recommended path forward.

Frequently Asked Questions (FAQ)

Q: Can LM5115SDX/NOPB be used as a direct replacement for LM5115SDX?

A: Yes. Both parts share identical electrical specifications, operating parameters, and package dimensions (16-WSON 5x5). The suffix "/NOPB" indicates Tape & Reel packaging format, which does not affect functional compatibility. The primary advantage is active product status and RoHS3 compliance.

Q: Is TEA1716T/2,518 compatible with LM5115SDX applications?

A: No. TEA1716T/2,518 is a PFC controller designed for discontinuous conduction mode operation with AC input voltage (70 ~ 276 VAC). The LM5115SDX is a secondary-side DC controller with 5V ~ 7.5V supply voltage. These parts serve different power conversion stages and are not interchangeable.

Q: What are the packaging differences between LM5115SDX and LM5115SDX/NOPB?

A: Both use identical 16-WFDFN Exposed Pad case with 16-WSON (5x5) supplier package. The difference is in supply format: LM5115SDX is standard packaging, while LM5115SDX/NOPB is supplied in Tape & Reel format for automated assembly processes.

Q: Why is the original LM5115SDX marked as obsolete?

A: Product obsolescence is determined by the manufacturer. LM5115SDX/NOPB remains active and is the current production equivalent, making it the recommended selection for new procurement and design continuity.

Q: Are there compliance differences between the two LM5115 variants?

A: Yes. LM5115SDX is RoHS non-compliant, while LM5115SDX/NOPB is RoHS3 compliant. Both maintain identical REACH and ECCN classifications. For applications requiring environmental compliance certification, LM5115SDX/NOPB is required.