PI2EQX632EXUBEX Equivalent & Substitute Parts

Part Overview

The PI2EQX632EXUBEX is a 2-channel USB 3.0 buffer and redriver IC manufactured by Diodes Incorporated, housed in an 18-X2QFN (2x2) surface mount package. This device provides input equalization and output de-emphasis signal conditioning for USB 3.0 applications at 1.8V supply voltage. The part is currently in Last Time Buy status, making identification of active equivalent and substitute parts essential for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI2EQX632EXUBEX
Manufacturer	Diodes Incorporated
Category	Interface
Type	Buffer, ReDriver
Applications	USB 3.0
Number of Channels	2
Input/Output Signal Type	CML
Signal Conditioning	Input Equalization, Output De-Emphasis
Voltage - Supply	1.8V
Package / Case	18-XFQFN Exposed Pad
Supplier Device Package	18-X2QFN (2x2)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution for the PI2EQX632EXUBEX is determined by the following critical parameters:

Application Compatibility: USB 3.0 operation with CML input/output signal types
Channel Configuration: 2-channel redriver architecture
Signal Conditioning: Input equalization and output de-emphasis capability
Supply Voltage Range: Compatibility with 1.8V nominal supply
Package Form Factor: Surface mount QFN package with exposed pad
Functional Classification: Buffer/redriver IC for high-speed interface conditioning

The PI2EQX638XUBEX from Diodes Incorporated serves as the primary active equivalent, offering the same 2-channel USB 3.0 redriver functionality in an identical package footprint with expanded supply voltage range (1.7V–1.9V) and active product status. Texas Instruments DS100BR111 series parts provide functional alternatives for SATA applications with higher data rate capability (10.3Gbps) but operate at different supply voltages (2.375V–3.6V) and larger package formats (24-WQFN). The DS125BR111 series extends functionality to PCIe and SAS applications with 12.5Gbps data rate support, representing a higher-performance alternative for multi-protocol environments.

Parameter Comparison

Parameter	PI2EQX632EXUBEX	PI2EQX638XUBEX	DS100BR111ASQE/NOPB	DS100BR111SQE/NOPB	DS125BR111RTWT
Manufacturer	Diodes Inc.	Diodes Inc.	Texas Instruments	Texas Instruments	Texas Instruments
Type	Buffer, ReDriver	Buffer, ReDriver	Buffer, ReDriver	Buffer, ReDriver	Buffer, ReDriver
Channels	2	2	2	2	2
Applications	USB 3.0	USB 3.0	SATA	SATA	PCIe, SAS, SATA
Input/Output	CML	CML	CML	CML	CML
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
Data Rate (Max)	—	—	10.3Gbps	10.3Gbps	12.5Gbps
Voltage - Supply	1.8V	1.7V–1.9V	2.375V–3.6V	2.375V–3.6V	2.5V–3.3V
Current - Supply	—	—	50mA	50mA	40mA
Operating Temperature	—	-40°C–85°C	-40°C–85°C	-40°C–85°C	-40°C–85°C
Package / Case	18-XFQFN Exposed Pad	18-XFQFN Exposed Pad	24-WFQFN Exposed Pad	24-WFQFN Exposed Pad	24-WFQFN Exposed Pad
Supplier Device Package	18-X2QFN (2x2)	18-X2QFN (2x2)	24-WQFN (4x4)	24-WQFN (4x5)	24-WQFN (4x4)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
Product Status	Last Time Buy	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Equivalent (Same Package, Same Application): The PI2EQX638XUBEX is the recommended substitute for the PI2EQX632EXUBEX. Both parts are manufactured by Diodes Incorporated, share identical 18-X2QFN (2x2) package geometry, and provide 2-channel USB 3.0 redriver functionality with input equalization and output de-emphasis. The PI2EQX638XUBEX operates at 1.7V–1.9V supply voltage, encompassing the 1.8V nominal specification of the original part. The PI2EQX638XUBEX maintains ROHS3 compliance and MSL 1 rating, with active product status ensuring long-term availability.

Alternative Substitutes (Different Package, Extended Application Support): Texas Instruments DS100BR111 series parts (DS100BR111ASQE/NOPB, DS100BR111SQE/NOPB) provide 2-channel redriver functionality with 10.3Gbps data rate support for SATA applications. These parts require package redesign due to 24-WQFN (4x4 or 4x5) form factor and operate at 2.375V–3.6V supply voltage, necessitating power supply circuit modifications. Both maintain ROHS3 compliance and active product status.

Higher-Performance Alternative: The DS125BR111RTWT extends redriver capability to 12.5Gbps data rate with multi-protocol support (PCIe, SAS, SATA). This part operates at 2.5V–3.3V supply voltage and requires 24-WQFN (4x4) package redesign. It is suitable for applications requiring enhanced bandwidth and protocol flexibility beyond USB 3.0 specifications.

All substitute parts maintain ROHS3 compliance, active product status, and surface mount assembly compatibility. Selection depends on application requirements, supply voltage constraints, and package footprint availability in the target PCB design.

Frequently Asked Questions (FAQ)

Q: Can the PI2EQX638XUBEX directly replace the PI2EQX632EXUBEX without PCB redesign? A: Yes. Both parts use identical 18-X2QFN (2x2) package geometry with exposed pad. Pin-to-pin compatibility is maintained. Supply voltage range of the PI2EQX638XUBEX (1.7V–1.9V) encompasses the 1.8V nominal specification of the PI2EQX632EXUBEX. No PCB layout modifications are required.

Q: Why do Texas Instruments DS100BR111 series parts require package redesign? A: The DS100BR111 series uses 24-WQFN (4x4 or 4x5) package format, compared to the 18-X2QFN (2x2) of the PI2EQX632EXUBEX. Different pin counts, pin spacing, and footprint dimensions necessitate PCB layout changes. Thermal management via exposed pad differs between package types.

Q: Are the DS100BR111 and DS125BR111 parts compatible with USB 3.0 applications? A: The DS100BR111 series is specified for SATA applications. The DS125BR111 series supports PCIe, SAS, and SATA protocols. While both provide 2-channel redriver functionality with CML input/output and signal conditioning, they are not specified for USB 3.0 operation. Application-specific validation is required before use in USB 3.0 designs.

Q: What is the significance of MSL rating differences? A: The PI2EQX632EXUBEX and PI2EQX638XUBEX carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints during storage and handling. Texas Instruments parts carry MSL 3 (168 Hours), requiring controlled humidity storage and limiting shelf life to 168 hours after bag opening. This affects supply chain logistics and inventory management.

Q: Can I use a higher data rate part like DS125BR111RTWT in a USB 3.0 design? A: The DS125BR111RTWT supports 12.5Gbps data rate, exceeding USB 3.0 requirements. However, it is specified for PCIe, SAS, and SATA protocols, not USB 3.0. Functional compatibility cannot be assumed without application-specific validation and protocol compliance testing.

Q: What are the supply voltage implications of selecting alternative parts? A: The PI2EQX632EXUBEX operates at 1.8V. The PI2EQX638XUBEX accepts 1.7V–1.9V, requiring no power supply changes. Texas Instruments parts require 2.375V–3.6V (DS100BR111) or 2.5V–3.3V (DS125BR111), necessitating separate power supply circuits or voltage regulation modifications.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All parts listed—PI2EQX632EXUBEX, PI2EQX638XUBEX, DS100BR111 series, and DS125BR111 series—maintain ROHS3 compliance and REACH Unaffected status.

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