LMX2471SLEX Equivalent & Substitute Parts

Part Overview

The LMX2471SLEX is a PLL Frequency Synthesizer with Delta Sigma architecture manufactured by Texas Instruments. This integrated circuit operates at a maximum frequency of 3.6GHz and is housed in a 24-UFQFN surface mount package. The device is currently classified as obsolete, making identification of equivalent substitute parts essential for ongoing system support and component procurement.

Substiute Parts

LMX2471SLEX

Texas InstrumentsIn Stock: 1163LMX2471SLEX Datasheet

Current PartRFQ

LMX2470SLEX

National SemiconductorIn Stock: 16604LMX2470SLEX Datasheet

Parametric EquivalentRFQ

LMX2470SLEX/NOPB

Texas InstrumentsIn Stock: 2351LMX2470SLEX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LMX2471SLEX are identified based on the following critical parameters that determine functional compatibility:

Matching Parameters:

• Package / Case: 24-UFQFN (identical physical footprint)
• Voltage - Supply: 2.25V ~ 2.75V (identical supply range)
• Operating Temperature: -40°C ~ 85°C (identical operating range)
• Input/Output: CMOS (identical signal interface)
• PLL Configuration: Yes with Bypass (identical architecture)
• Divider/Multiplier: Yes/Yes (identical functional capability)
• Number of Circuits: 1 (identical circuit count)
• Ratio - Input:Output: 3:3 (identical ratio)

Substitution Constraint: The LMX2471SLEX operates at a maximum frequency of 3.6GHz. Substitute parts must support this frequency range or higher to ensure functional compatibility in existing designs.

Parameter Comparison

Engineering Selection Recommendations

LMX2470SLEX/NOPB is the preferred substitute for the obsolete LMX2471SLEX based on the following criteria:

• Product Status: Active status ensures ongoing availability and manufacturer support
• Compliance: ROHS3 compliant, meeting current regulatory requirements
• Packaging Options: Available in multiple packaging formats (Cut Tape and Tape & Reel), providing flexibility for production environments
• Electrical Compatibility: Identical supply voltage range (2.25V ~ 2.75V) and operating temperature range (-40°C ~ 85°C)
• Physical Compatibility: Identical 24-UFQFN package footprint enables direct PCB substitution

LMX2470SLEX (National Semiconductor) is an alternative substitute with identical electrical and physical specifications to LMX2470SLEX/NOPB, with the distinction of standard packaging availability.

Frequency Consideration: Both substitute parts operate at a maximum frequency of 2.6GHz, which is lower than the original LMX2471SLEX specification of 3.6GHz. Applications requiring frequencies above 2.6GHz cannot use these substitutes without design modification.

Frequently Asked Questions (FAQ)

Q: Can LMX2470SLEX/NOPB directly replace LMX2471SLEX on existing PCBs?

A: Yes, for applications operating at frequencies up to 2.6GHz. The 24-UFQFN package footprint is identical, and electrical specifications for supply voltage and operating temperature are matched. No PCB layout modifications are required.

Q: What is the primary limitation when substituting LMX2470SLEX for LMX2471SLEX?

A: The maximum operating frequency is reduced from 3.6GHz to 2.6GHz. If your application requires frequency synthesis above 2.6GHz, this substitute is not suitable without circuit redesign.

Q: Why is LMX2470SLEX/NOPB recommended over LMX2470SLEX?

A: LMX2470SLEX/NOPB is manufactured by Texas Instruments (the original manufacturer of LMX2471SLEX) and carries ROHS3 compliance certification. It also offers multiple packaging options including Tape & Reel format, which is standard for production environments.

Q: Are there any supply voltage or temperature range differences between the main part and substitutes?

A: No. All three parts operate within identical supply voltage (2.25V ~ 2.75V) and temperature ranges (-40°C ~ 85°C).

Q: What does the "/NOPB" suffix indicate in LMX2470SLEX/NOPB?

A: The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging, confirming RoHS compliance and the absence of lead in the component.

Q: Is the 24-UFQFN package the same across all three parts?

A: Yes. All three parts use the identical 24-UFQFN package with dimensions 4.5x4.6mm, ensuring mechanical and electrical compatibility on the PCB.