XR76115EL-F Equivalent & Substitute Parts

Part Overview

The XR76115EL-F is a buck switching regulator IC from MaxLinear's Power Blox™ series, designed for positive adjustable output applications. This device delivers 15A output current with an adjustable output range from 0.6V to 18V, operating from a 4.5V to 22V input supply. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

XR76115EL-F

MaxLinear, Inc.In Stock: 2159XR76115EL-F Datasheet

Current PartRFQ

XR76121ELTR-F

MaxLinear, Inc.In Stock: 706XR76121ELTR-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the XR76115EL-F is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Input voltage range: 4.5V to 22V minimum
• Output voltage adjustability: 0.6V minimum reference
• Synchronous rectification capability
• Operating temperature range: -40°C to 125°C
• Topology: Buck (step-down) configuration
• Output configuration: Positive adjustable

Mechanical Compatibility Criteria:

• Surface mount mounting type
• QFN package family compatibility
• RoHS compliance status

The XR76121ELTR-F qualifies as a manufacturer-recommended substitute based on these parameters. While it offers enhanced specifications (20A output current, 22V maximum output voltage, and extended switching frequency to 1MHz), it maintains full electrical and mechanical compatibility with the original design requirements.

Parameter Comparison

Engineering Selection Recommendations

The XR76121ELTR-F is the manufacturer-recommended substitute for the obsolete XR76115EL-F. Both devices maintain identical input voltage specifications (4.5V to 22V), minimum output voltage (0.6V), operating temperature range (-40°C to 125°C), and synchronous rectification capability. Both are RoHS compliant and manufactured by MaxLinear, Inc.

The XR76121ELTR-F offers superior performance characteristics with 20A output current capacity (versus 15A), extended maximum output voltage to 22V (versus 18V), and increased switching frequency capability to 1MHz (versus 800kHz). The substitute is currently in active production status, ensuring long-term availability and supply chain stability.

Package differences exist: the XR76115EL-F uses a 37-PowerVFQFN (6x6) package, while the XR76121ELTR-F uses a 16-PowerVQFN (5x6) package. PCB layout modifications are required to accommodate the different package footprint.

Frequently Asked Questions (FAQ)

Q: Can the XR76121ELTR-F directly replace the XR76115EL-F without circuit modifications?

A: Electrical substitution is valid based on input/output voltage ranges, adjustability, and synchronous rectification compatibility. However, the different QFN package footprints (37-PowerVFQFN versus 16-PowerVQFN) require PCB layout redesign. Pin configuration differences must be verified against device datasheets before implementation.

Q: What are the key electrical parameters that determine substitution eligibility?

A: Input voltage range (4.5V to 22V), minimum output voltage (0.6V), synchronous rectification capability, and operating temperature range (-40°C to 125°C) are the primary criteria. The substitute must support positive adjustable output configuration and buck topology.

Q: Why is the XR76121ELTR-F recommended over other potential alternatives?

A: MaxLinear, Inc. explicitly designates the XR76121ELTR-F as the manufacturer-recommended substitute. It maintains full electrical compatibility while offering enhanced current capacity (20A), extended output voltage range (to 22V), and active production status.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are RoHS compliant with identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications. Compliance status is equivalent.

Q: What should be considered when transitioning from XR76115EL-F to XR76121ELTR-F?

A: PCB footprint redesign is mandatory due to package differences. Verify pin assignments, thermal management requirements, and component placement constraints. The enhanced current capacity and switching frequency of the substitute may allow optimization of external component values.