LM5115MTCX Equivalent & Substitute Parts

Part Overview

The LM5115MTCX 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, with a supply current of 4 mA. The device is packaged in a 16-TSSOP surface mount package and is currently classified as Last Time Buy, indicating end-of-life status. Due to this product status, identifying equivalent and substitute parts is essential for design continuity and long-term supply chain planning.

Substiute Parts

LM5115MTCX

Texas InstrumentsIn Stock: 5431LM5115MTCX Datasheet

Current PartRFQ

LM5115MTCX/NOPB

Texas InstrumentsIn Stock: 24897LM5115MTCX/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 LM5115MTCX is determined by the following critical parameters: functional category (Secondary-Side Controller), input and supply voltage ranges, operating temperature range, package type (16-TSSOP), surface mount capability, and regulatory compliance (ROHS3). The substitute parts identified are grouped based on their ability to meet these electrical and mechanical specifications within the same application domain.

The primary substitute, LM5115MTCX/NOPB, is a direct equivalent from the same manufacturer with identical electrical specifications and packaging. The secondary substitute, TEA1716T/2,518, represents a manufacturer-recommended alternative from NXP USA Inc., though it operates in a different functional mode (PFC controller in DCM) and has different voltage supply requirements (70 ~ 276 VAC), making it suitable only for specific application contexts where PFC control is required.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring a direct replacement of the LM5115MTCX, the LM5115MTCX/NOPB is the primary choice. This part maintains identical electrical specifications, package dimensions, and thermal operating range while offering Active product status and significantly higher inventory availability (24,845 units versus 5,400 units). Both parts are ROHS3 compliant with MSL 1 rating, ensuring compatibility with standard manufacturing processes.

The TEA1716T/2,518 from NXP USA Inc. is a manufacturer-recommended alternative but operates under fundamentally different electrical parameters (PFC controller with 70 ~ 276 VAC supply voltage versus secondary-side controller with 5V ~ 7.5V supply voltage). This part is suitable only for applications where PFC control functionality is required and the circuit topology can accommodate the different voltage specifications. The TEA1716T/2,518 offers an extended operating temperature range (-40°C ~ 150°C) and Active product status, but requires PCB layout modifications due to its larger 24-SOIC package and higher moisture sensitivity level (MSL 3).

Frequently Asked Questions (FAQ)

Q: Can LM5115MTCX/NOPB be used as a direct drop-in replacement for LM5115MTCX?

A: Yes. The LM5115MTCX/NOPB is electrically and mechanically identical to the LM5115MTCX, with the same 16-TSSOP package, voltage specifications (5V ~ 30V input, 5V ~ 7.5V supply), operating temperature range (-40°C ~ 125°C), and regulatory compliance. The primary difference is product status (Active versus Last Time Buy) and packaging format (both Tape & Reel).

Q: Is TEA1716T/2,518 compatible with existing LM5115MTCX designs?

A: No, not without significant circuit redesign. While both are power management controllers, the TEA1716T/2,518 is a PFC controller designed for AC input voltage (70 ~ 276 VAC), whereas the LM5115MTCX is a secondary-side controller for DC input (5V ~ 30V). The functional operation, control topology, and application context are fundamentally different. Additionally, the TEA1716T/2,518 uses a 24-SOIC package versus the 16-TSSOP package of the LM5115MTCX, requiring PCB layout changes.

Q: What are the key differences in moisture sensitivity between these parts?

A: The LM5115MTCX and LM5115MTCX/NOPB both have MSL 1 (Unlimited), meaning they can be stored indefinitely without moisture baking requirements. The TEA1716T/2,518 has MSL 3 (168 Hours), requiring moisture baking if the part is exposed to ambient conditions for more than 168 hours before soldering. This affects handling, storage, and manufacturing procedures.

Q: Why is LM5115MTCX marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments is discontinuing this product. The LM5115MTCX/NOPB, which is functionally equivalent and currently Active, is the recommended path forward for new designs and ongoing production.

Q: Are all three parts ROHS3 compliant?

A: Yes. The LM5115MTCX, LM5115MTCX/NOPB, and TEA1716T/2,518 are all ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.