LM2677SD-5.0 Equivalent & Substitute Parts

Part Overview

The LM2677SD-5.0 is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for step-down voltage conversion with a fixed 5V output at 5A maximum current. This device operates across an input voltage range of 8V to 40V and features a 260kHz switching frequency in a 14-VDFN surface mount package with exposed pad.

The LM2677SD-5.0 is classified as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Substiute Parts

LM2677SD-5.0

Texas InstrumentsIn Stock: 2146LM2677SD-5.0 Datasheet

Current PartRFQ

LM2677SD-5.0/NOPB

Texas InstrumentsIn Stock: 1617LM2677SD-5.0/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2677SD-5.0 is determined by strict equivalence across the following critical parameters:

• Output voltage configuration (fixed 5V)
• Maximum output current rating (5A)
• Input voltage operating range (8V to 40V minimum/maximum)
• Switching topology (buck converter)
• Package form factor (14-VDFN Exposed Pad)
• Thermal operating range (-40°C to 125°C)
• Switching frequency (260kHz)

Parts meeting all these criteria are classified as direct substitutes. Variations in packaging format (such as tape & reel versus bulk) do not affect electrical equivalence but may impact procurement and handling procedures.

Parameter Comparison

Engineering Selection Recommendations

The LM2677SD-5.0/NOPB is the direct electrical and mechanical equivalent of the LM2677SD-5.0. Both devices share identical electrical specifications, package geometry, and thermal characteristics.

The primary distinction between these parts is product status and regulatory compliance. The LM2677SD-5.0/NOPB carries active product status from Texas Instruments, ensuring continued availability and technical support. Additionally, the LM2677SD-5.0/NOPB meets ROHS3 compliance requirements, whereas the original LM2677SD-5.0 is RoHS non-compliant.

For new designs or ongoing production requiring regulatory compliance with modern environmental standards, the LM2677SD-5.0/NOPB is the appropriate selection. The packaging format difference (tape & reel versus bulk) reflects standard commercial distribution practices and does not affect circuit performance or pin compatibility.

Frequently Asked Questions (FAQ)

Q: Are the LM2677SD-5.0 and LM2677SD-5.0/NOPB electrically identical?

A: Yes. Both devices are manufactured by Texas Instruments with identical electrical specifications, including output voltage, current rating, input voltage range, switching frequency, and thermal operating range. They share the same 14-VDFN package geometry and pin configuration.

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

A: The "/NOPB" suffix designates that the part is supplied in tape & reel packaging format without lead (Pb) and meets RoHS3 compliance. The original LM2677SD-5.0 uses bulk packaging and does not meet RoHS compliance.

Q: Can I use LM2677SD-5.0/NOPB as a direct replacement in existing designs?

A: Yes. The LM2677SD-5.0/NOPB is a direct pin-for-pin and functionally equivalent substitute. No circuit modifications or PCB layout changes are required. The device operates identically within the same electrical and thermal parameters.

Q: Why is the original LM2677SD-5.0 marked as obsolete?

A: Texas Instruments has transitioned this product line to the active LM2677SD-5.0/NOPB variant, which incorporates modern RoHS3 compliance and improved supply chain management through tape & reel packaging.

Q: Are there any differences in thermal performance between these parts?

A: No. Both devices operate across the identical temperature range of -40°C to 125°C (junction temperature) and share the same thermal characteristics and package construction.

Q: What are the inventory implications of choosing one variant over the other?

A: The LM2677SD-5.0/NOPB maintains active inventory status (1526 pcs available), ensuring reliable procurement. The original LM2677SD-5.0 is available in limited quantity (2100 pcs) but carries obsolete status, indicating no future production or restocking.