PI6ULS5V9517AWEX Equivalent & Substitute Parts

Part Overview

The PI6ULS5V9517AWEX is a Buffer/ReDriver interface component manufactured by Diodes Incorporated, designed for I2C/SMBus applications with a maximum data rate of 400kHz. This part operates as a single-channel 2-wire bus buffer in an 8-SOIC package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI6ULS5V9517AWEX
Manufacturer	Diodes Incorporated
Product Category	Interface - Buffer/ReDriver
Application	I2C
Data Rate (Max)	400kHz
Number of Channels	1
Input/Output	2-Wire Bus
Voltage Supply Range	0.8V ~ 5.5V
Current Supply	500µA
Input Capacitance	6 pF
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the PI6ULS5V9517AWEX is determined by the following critical parameters:

Primary Substitution Criteria:

Application: I2C interface buffering
Data Rate: 400kHz maximum
Input/Output Configuration: 2-Wire Bus
Package Compatibility: 8-SOIC or equivalent surface-mount packages
Voltage Supply Range: Minimum 2.7V ~ 5.5V (compatible with original 0.8V ~ 5.5V range)
RoHS3 Compliance and REACH Unaffected status

Substitution Categories:

Category 1: Direct Pin-Compatible Substitutes (8-SOIC Package) NXP PCA9517 series parts (PCA9517AD,118 and PCA9517D,118) provide direct package compatibility with 8-SOIC form factor. These are active products with 2-channel capability, maintaining the same 400kHz data rate and 2-wire bus interface.

Category 2: Functional Equivalents with Package Variation Analog Devices LTC4301 series parts offer I2C hotswap redriver functionality at 400kHz in alternative packages (8-DFN and 8-MSOP). These provide enhanced operating temperature ranges and are available in both tube and tape & reel packaging options.

Category 3: Voltage Level Translation Alternative Texas Instruments TCA9517DR provides bidirectional voltage level translation for I2C applications in 8-SOIC package, suitable for systems requiring voltage domain bridging.

Parameter Comparison

Part Number	Manufacturer	Type	Channels	Data Rate	Voltage Supply	Current Supply	Package	Status
PI6ULS5V9517AWEX	Diodes Inc.	Buffer/ReDriver	1	400kHz	0.8V ~ 5.5V	500µA	8-SOIC	Obsolete
PCA9517AD,118	NXP USA Inc.	Buffer/ReDriver	2	400kHz	2.7V ~ 5.5V	5mA	8-SOIC	Active
PCA9517D,118	NXP USA Inc.	Buffer/ReDriver	2	400kHz	2.7V ~ 5.5V	5mA	8-SOIC	Active
TCA9517DR	Texas Instruments	Voltage Level Translator	2 (Bidirectional)	400kHz	VCCA: 0.9V ~ 5.5V / VCCB: 2.7V ~ 5.5V	—	8-SOIC	Active
LTC4301CDD#TRPBF	Analog Devices Inc.	Buffer/ReDriver (Hotswap)	2	400kHz	2.7V ~ 5.5V	4.5mA	8-DFN (3x3)	Active
LTC4301CMS8#TRPBF	Analog Devices Inc.	Buffer/ReDriver (Hotswap)	2	400kHz	2.7V ~ 5.5V	4.5mA	8-MSOP	Active
LTC4301IDD#TRPBF	Analog Devices Inc.	Buffer/ReDriver (Hotswap)	2	400kHz	2.7V ~ 5.5V	4.5mA	8-DFN (3x3)	Active
LTC4301IMS8#PBF	Analog Devices Inc.	Buffer/ReDriver (Hotswap)	2	400kHz	2.7V ~ 5.5V	4.5mA	8-MSOP	Active

Engineering Selection Recommendations

For Direct Replacement (Same PCB Layout): Select PCA9517AD,118 or PCA9517D,118 from NXP USA Inc. Both maintain 8-SOIC package compatibility with the original PI6ULS5V9517AWEX. The primary difference is packaging format: PCA9517AD,118 is supplied in Cut Tape & Digi-Reel format, while PCA9517D,118 is supplied in Tape & Reel format. Both are active products with ROHS3 compliance and REACH Unaffected status. Note that these parts feature 2 channels versus the original 1 channel, providing additional functionality without compromising compatibility.

For Space-Constrained Designs: Analog Devices LTC4301 series in 8-DFN (3x3) package (LTC4301CDD#TRPBF or LTC4301IDD#TRPBF) offers a smaller footprint while maintaining 400kHz I2C performance. The LTC4301IDD#TRPBF variant supports extended operating temperature range (-40°C ~ 85°C) compared to the commercial grade LTC4301CDD#TRPBF (0°C ~ 70°C).

For Voltage Domain Bridging: Texas Instruments TCA9517DR provides bidirectional voltage level translation capability in 8-SOIC package, suitable for systems requiring I2C communication across different voltage domains (VCCA: 0.9V ~ 5.5V, VCCB: 2.7V ~ 5.5V).

For Standard MSOP Package Preference: Analog Devices LTC4301CMS8#TRPBF or LTC4301IMS8#PBF in 8-MSOP package provide alternative form factor while maintaining 400kHz I2C performance and 2-channel configuration.

All recommended substitutes maintain ROHS3 compliance and REACH Unaffected status consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can PCA9517 parts directly replace PI6ULS5V9517AWEX without PCB modification? A: Yes. PCA9517AD,118 and PCA9517D,118 are pin-compatible in the 8-SOIC package. Both maintain the same physical dimensions (0.154", 3.90mm Width) and surface-mount configuration. The primary difference is that PCA9517 parts feature 2 channels instead of 1, providing additional I2C buffering capability.

Q: What is the minimum voltage supply requirement for substitute parts? A: NXP PCA9517 series and Analog Devices LTC4301 series require minimum 2.7V supply voltage, compared to the original PI6ULS5V9517AWEX at 0.8V minimum. For applications requiring sub-2.7V operation, Texas Instruments TCA9517DR supports VCCA down to 0.9V, though VCCB requires minimum 2.7V.

Q: Are there package alternatives to 8-SOIC? A: Yes. Analog Devices LTC4301 series is available in 8-DFN (3x3) and 8-MSOP packages. These alternatives provide equivalent I2C buffering at 400kHz with reduced footprint compared to 8-SOIC, though they require PCB layout modification.

Q: What is the difference between LTC4301C and LTC4301I variants? A: The primary difference is operating temperature range. LTC4301C variants operate from 0°C ~ 70°C (commercial grade), while LTC4301I variants operate from -40°C ~ 85°C (industrial grade). Both maintain identical electrical performance at 400kHz I2C operation.

Q: Do all substitute parts support I2C hotswap functionality? A: Analog Devices LTC4301 series explicitly supports I2C hotswap applications. NXP PCA9517 and Texas Instruments TCA9517 are standard I2C buffers/translators without dedicated hotswap features. Select LTC4301 variants if hotswap capability is required.

Q: What is the current supply difference between original and substitutes? A: The original PI6ULS5V9517AWEX draws 500µA. NXP PCA9517 series draws 5mA, and Analog Devices LTC4301 series draws 4.5mA. Higher current consumption may require power supply design review in battery-powered or low-power applications.

Q: Are all substitutes RoHS3 compliant? A: Yes. All recommended substitute parts maintain ROHS3 compliance and REACH Unaffected status consistent with the original PI6ULS5V9517AWEX.

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