PI2EQX4401DZFEX Equivalent & Substitute Parts

Part Overview

The PI2EQX4401DZFEX is a 2-channel PCIe buffer/redriver IC manufactured by Diodes Incorporated, designed for signal conditioning in high-speed serial applications. This device features input equalization and output de-emphasis capabilities, operating at a maximum data rate of 2.5Gbps with a 36-TQFN package form factor. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI2EQX4401DZFEX
Manufacturer	Diodes Incorporated
Product Category	Interface - Buffer/ReDriver
Type	Buffer, ReDriver
Applications	PCIe
Number of Channels	2
Data Rate (Max)	2.5Gbps
Input/Output Signal Type	CML
Signal Conditioning	Input Equalization, Output De-Emphasis
Voltage - Supply	1.7V ~ 1.9V
Operating Temperature	0°C ~ 70°C
Package / Case	36-WFQFN Exposed Pad
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PI2EQX4401DZFEX requires evaluation based on the following critical parameters:

Primary Substitution Criteria:

Number of Channels: 2 channels (fixed requirement)
Input/Output Signal Type: CML (fixed requirement)
Signal Conditioning: Input Equalization and Output De-Emphasis (fixed requirement)
Mounting Type: Surface Mount (fixed requirement)
RoHS Compliance: ROHS3 Compliant (fixed requirement)

Secondary Compatibility Factors:

Data Rate (Max): Substitute must support minimum 2.5Gbps; higher data rates are acceptable
Voltage - Supply: Substitute voltage range must be compatible with system design
Operating Temperature: Substitute range must cover or exceed 0°C ~ 70°C
Package Form Factor: Physical dimensions and pin count must be compatible with PCB layout

The substitute parts identified are Texas Instruments devices from the DS100BR111, DS100BR210, DS125BR111, and DS64BR111 families. These devices meet the core functional requirements of 2-channel CML buffer/redriver operation with input equalization and output de-emphasis. All substitute parts are active products with established supply chains, addressing the obsolescence of the original PI2EQX4401DZFEX.

Parameter Comparison

Parameter	PI2EQX4401DZFEX	DS100BR111ASQ/NOPB	DS100BR111ASQE/NOPB	DS100BR111SQ/NOPB	DS100BR111SQE/NOPB	DS100BR210SQ/NOPB	DS100BR210SQE/NOPB	DS125BR111RTWR	DS125BR111RTWT	DS64BR111SQ/NOPB	DS64BR111SQE/NOPB
Manufacturer	Diodes Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Type	Buffer, ReDriver	Buffer, ReDriver	Buffer, ReDriver	Buffer, ReDriver	Buffer, ReDriver	Buffer, ReDriver	Buffer, ReDriver	Buffer, ReDriver	Buffer, ReDriver	Buffer, ReDriver	Buffer, ReDriver
Number of Channels	2	2	2	2	2	2	2	2	2	2	2
Input/Output Signal Type	CML	CML	CML	CML	CML	CML	CML	CML	CML	CML	CML
Data Rate (Max)	2.5Gbps	10.3Gbps	10.3Gbps	10.3Gbps	10.3Gbps	10.3Gbps	10.3Gbps	12.5Gbps	12.5Gbps	6.4Gbps	6.4Gbps
Signal Conditioning	Input Equalization, Output De-Emphasis	Input Equalization, Output De-Emphasis	Input Equalization, Output De-Emphasis	Input Equalization, Output De-Emphasis	Input Equalization, Output De-Emphasis	Input Equalization, Output De-Emphasis	Input Equalization, Output De-Emphasis	Input Equalization, Output De-Emphasis	Input Equalization, Output De-Emphasis	Input Equalization, Output De-Emphasis	Input Equalization, Output De-Emphasis
Voltage - Supply	1.7V ~ 1.9V	2.375V ~ 3.6V	2.375V ~ 3.6V	2.375V ~ 3.6V	2.375V ~ 3.6V	2.375V ~ 3.6V	2.375V ~ 3.6V	2.5V ~ 3.3V	2.5V ~ 3.3V	2.375V ~ 3.6V	2.375V ~ 3.6V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	36-WFQFN Exposed Pad	24-WFQFN Exposed Pad	24-WFQFN Exposed Pad	24-WFQFN Exposed Pad	24-WFQFN Exposed Pad	24-WFQFN Exposed Pad	24-WFQFN Exposed Pad	24-WFQFN Exposed Pad	24-WFQFN Exposed Pad	24-WFQFN Exposed Pad	24-WFQFN Exposed Pad
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All identified substitute parts are active Texas Instruments products with ROHS3 compliance, addressing the obsolescence status of the PI2EQX4401DZFEX. Selection among substitute options depends on system-level requirements:

DS100BR111 Series (DS100BR111ASQ/NOPB, DS100BR111ASQE/NOPB, DS100BR111SQ/NOPB, DS100BR111SQE/NOPB): These devices support 10.3Gbps data rates and operate across -40°C to 85°C temperature range with 2.375V to 3.6V supply voltage. The DS100BR111 base product is optimized for SATA applications but maintains full compatibility with PCIe signal conditioning requirements. Packaging variants include Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel options.

DS100BR210 Series (DS100BR210SQ/NOPB, DS100BR210SQE/NOPB): These variants feature 230ps delay time specification and 10.3Gbps capability. They are functionally equivalent to the DS100BR111 series with identical electrical characteristics and package form factors.

DS125BR111 Series (DS125BR111RTWR, DS125BR111RTWT): These devices provide enhanced performance with 12.5Gbps data rate capability and 70ps delay time. Supply voltage range is 2.5V to 3.3V. These parts are suitable for applications requiring higher bandwidth margin or lower propagation delay.

DS64BR111 Series (DS64BR111SQ/NOPB, DS64BR111SQE/NOPB): These devices support 6.4Gbps data rates and are optimized for SAS/SATA applications. They maintain the same signal conditioning architecture and package footprint as other substitutes.

Package Consideration: All substitute parts use 24-WFQFN packages, which differ from the original 36-TQFN package. PCB layout redesign is required for physical implementation.

Frequently Asked Questions (FAQ)

Q: Can DS100BR111 series parts directly replace the PI2EQX4401DZFEX without PCB modification?

A: No. The PI2EQX4401DZFEX uses a 36-TQFN package, while all substitute parts use 24-WFQFN packages. PCB layout redesign is necessary to accommodate the different pin count and physical dimensions.

Q: What is the primary difference between DS100BR111 and DS125BR111 substitutes?

A: The DS125BR111 series supports higher data rates (12.5Gbps versus 10.3Gbps) and features lower propagation delay (70ps versus unspecified). The DS125BR111 operates at 2.5V to 3.3V supply voltage, while DS100BR111 operates at 2.375V to 3.6V. Selection depends on system bandwidth requirements and available supply voltage.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts carry ROHS3 compliance certification, matching the compliance status of the original PI2EQX4401DZFEX.

Q: What is the difference between packaging variants (ASQ/NOPB, ASQE/NOPB, SQ/NOPB, SQE/NOPB)?

A: The suffix designations indicate packaging and tape format. ASQ/NOPB and SQ/NOPB variants are available in standard Tape & Reel format. ASQE/NOPB and SQE/NOPB variants are available in Cut Tape (CT) & Digi-Reel format. Electrical performance is identical across all variants of the same base product number.

Q: Can DS64BR111 parts substitute for PCIe applications?

A: DS64BR111 parts are optimized for SAS/SATA applications with 6.4Gbps maximum data rate. While they maintain the required 2-channel CML buffer/redriver architecture with input equalization and output de-emphasis, the lower data rate may not provide sufficient margin for PCIe applications. DS100BR111 or DS125BR111 series are recommended for PCIe implementations.

Q: What is the operating temperature range difference between the original part and substitutes?

A: The PI2EQX4401DZFEX operates from 0°C to 70°C. All substitute parts operate from -40°C to 85°C, providing extended temperature coverage suitable for industrial and automotive applications.

Q: Are there supply voltage compatibility concerns when substituting?

A: Yes. The PI2EQX4401DZFEX requires 1.7V to 1.9V supply voltage. DS100BR111 and DS64BR111 substitutes require 2.375V to 3.6V, while DS125BR111 requires 2.5V to 3.3V. System power supply design must be verified to support the substitute part voltage requirements.

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