PI49FCT20803LE Equivalent & Substitute Parts

Part Overview

The PI49FCT20803LE is a Clock Fanout Buffer (Distribution) IC manufactured by Diodes Incorporated, designed for 1:7 clock distribution at frequencies up to 150 MHz. This component operates with CMOS/TTL input and output compatibility, housed in a 16-TSSOP surface mount package. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and procurement planning.

Substiute Parts

PI49FCT20803LE

Diodes IncorporatedIn Stock: 17930PI49FCT20803LE Datasheet

Current PartRFQ

PI49FCT20802LEX

Diodes IncorporatedIn Stock: 20732PI49FCT20802LEX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PI49FCT20803LE is determined by the following critical parameters:

• Package Compatibility: Both main and substitute parts must use the 16-TSSOP (0.173", 4.40mm Width) surface mount package to ensure PCB layout compatibility without redesign.
• Electrical Specifications: Maximum frequency (150 MHz), supply voltage range (2.3V ~ 2.7V), and input/output logic levels (CMOS/TTL) must be maintained or exceeded.
• Series Continuity: Parts within the 49FCT series from Diodes Incorporated maintain consistent electrical and mechanical characteristics.
• Output Ratio Consideration: While the PI49FCT20803LE provides 1:7 distribution, the substitute PI49FCT20802LEX provides 1:5 distribution. This represents a functional reduction in output channels and requires circuit-level evaluation for applicability.

Parameter Comparison

Engineering Selection Recommendations

The PI49FCT20802LEX is the manufacturer-recommended substitute for the obsolete PI49FCT20803LE. Both components share identical electrical specifications, supply voltage requirements, frequency capability, and package form factor. The primary distinction is the output channel ratio: the substitute provides 1:5 distribution versus the original 1:7 distribution.

Selection of the PI49FCT20802LEX is appropriate when circuit design accommodates five output channels instead of seven. The active product status of the PI49FCT20802LEX ensures ongoing availability and manufacturing support, addressing the obsolescence constraint of the original part. Both components maintain ROHS3 compliance and identical thermal operating ranges, supporting equivalent reliability in target applications.

Frequently Asked Questions (FAQ)

Q: Can the PI49FCT20802LEX directly replace the PI49FCT20803LE without PCB modification?

A: Yes, regarding physical placement. Both components use the identical 16-TSSOP package with matching pin pitch and body dimensions. However, the reduction from 7 to 5 output channels requires verification that your circuit design requires no more than 5 clock distribution outputs.

Q: What is the primary reason for substitution?

A: The PI49FCT20803LE is classified as obsolete. The PI49FCT20802LEX is an active product from the same manufacturer and series, ensuring continued procurement availability and manufacturing support.

Q: Are the electrical specifications identical between these parts?

A: Yes. Both components operate at identical maximum frequency (150 MHz), supply voltage range (2.3V ~ 2.7V), input/output logic types (CMOS/TTL), and temperature range (-40°C ~ 85°C).

Q: Does the packaging differ between the main part and substitute?

A: The physical package is identical (16-TSSOP). The PI49FCT20802LEX is supplied in Tape & Reel (TR) packaging format, which is standard for active production components.

Q: What is the critical limitation of using the PI49FCT20802LEX?

A: The substitute provides 1:5 output distribution instead of 1:7. Applications requiring all seven clock outputs cannot use this substitute without additional buffering components or circuit redesign.

Q: Are both parts RoHS compliant?

A: Yes. Both the PI49FCT20803LE and PI49FCT20802LEX are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing.