PCA9517DR Equivalent & Substitute Parts

Part Overview

The PCA9517DR is a 2-channel I2C buffer and redriver IC manufactured by Texas Instruments in 8-SOIC packaging. It operates at a maximum data rate of 400kHz and supports I2C 2-wire bus applications with a supply voltage range of 0.9V to 5.5V and 2.7V to 5.5V. The product is classified as "Not For New Designs," making equivalent and substitute parts necessary for ongoing system support and new design alternatives.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	PCA9517DR
Type	Buffer, ReDriver
Application	I2C
Number of Channels	2
Data Rate (Max)	400kHz
Voltage - Supply	0.9V ~ 5.5V, 2.7V ~ 5.5V
Current - Supply	1.5mA
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution for the PCA9517DR is determined by the following critical parameters:

Functional Type: Buffer/ReDriver for I2C applications
Channel Configuration: 2-channel operation
Data Rate: 400kHz maximum
Supply Voltage Compatibility: Minimum 2.7V to 5.5V overlap required
Operating Temperature Range: -40°C to 85°C preferred for industrial applications
Package Compatibility: 8-pin surface mount packages (SOIC, SO, DFN, MSOP)
Compliance: ROHS3 compliant, MSL Level 1

Substitute parts are grouped by manufacturer and package type while maintaining functional equivalence in I2C buffer/redriver operation.

Parameter Comparison

Part Number	Manufacturer	Type	Channels	Data Rate (Max)	Supply Voltage	Current - Supply	Operating Temp	Package	Product Status
PCA9517DR	Texas Instruments	Buffer, ReDriver	2	400kHz	2.7V ~ 5.5V	1.5mA	-40°C ~ 85°C	8-SOIC	Not For New Designs
TCA9517DR	Texas Instruments	Voltage Level Translator Bidirectional	2	—	0.9V ~ 5.5V / 2.7V ~ 5.5V	—	-40°C ~ 85°C	8-SOIC	Active
PCA9508D,118	NXP USA Inc.	Buffer, ReDriver	1	400kHz	2.7V ~ 5.5V	1mA	-40°C ~ 85°C	8-SO	Active
PCA9517AD,118	NXP USA Inc.	Buffer, ReDriver	2	400kHz	2.7V ~ 5.5V	5mA	-40°C ~ 85°C	8-SO	Active
PCA9517D,118	NXP USA Inc.	Buffer, ReDriver	2	400kHz	2.7V ~ 5.5V	5mA	-40°C ~ 85°C	8-SO	Active
LTC4301CDD#PBF	Analog Devices Inc.	Buffer, ReDriver	2	400kHz	2.7V ~ 5.5V	4.5mA	0°C ~ 70°C	8-DFN (3x3)	Active
LTC4301CDD#TRPBF	Analog Devices Inc.	Buffer, ReDriver	2	400kHz	2.7V ~ 5.5V	4.5mA	0°C ~ 70°C	8-DFN (3x3)	Active
LTC4301CMS8#PBF	Analog Devices Inc.	Buffer, ReDriver	2	400kHz	2.7V ~ 5.5V	4.5mA	0°C ~ 70°C	8-MSOP	Active
LTC4301CMS8#TRPBF	Analog Devices Inc.	Buffer, ReDriver	2	400kHz	2.7V ~ 5.5V	4.5mA	0°C ~ 70°C	8-MSOP	Active
LTC4301IDD#PBF	Analog Devices Inc.	Buffer, ReDriver	2	400kHz	2.7V ~ 5.5V	4.5mA	-40°C ~ 85°C	8-DFN (3x3)	Active
LTC4301IDD#TRPBF	Analog Devices Inc.	Buffer, ReDriver	2	400kHz	2.7V ~ 5.5V	4.5mA	-40°C ~ 85°C	8-DFN (3x3)	Active

Engineering Selection Recommendations

Direct Functional Equivalents (Recommended for New Designs)

The NXP PCA9517AD,118 and PCA9517D,118 provide direct functional equivalence to the PCA9517DR with identical 2-channel, 400kHz I2C buffer/redriver operation. Both parts maintain the same supply voltage range (2.7V ~ 5.5V), operating temperature (-40°C ~ 85°C), and are classified as Active products. The primary difference is packaging format (8-SO versus 8-SOIC) and supply current (5mA versus 1.5mA). Both are ROHS3 compliant with MSL Level 1 rating.

Extended Temperature Range Alternative

The Analog Devices LTC4301IDD#PBF and LTC4301IDD#TRPBF offer identical functional specifications with extended operating temperature range (-40°C ~ 85°C) matching the original part. These parts feature 2-channel, 400kHz I2C hotswap redriver operation with 2.7V ~ 5.5V supply voltage. The 8-DFN (3x3) package provides a smaller footprint alternative. Supply current is 4.5mA. Both are ROHS3 compliant with MSL Level 1 rating and Active product status.

Limited Temperature Range Alternatives

The Analog Devices LTC4301CDD#PBF, LTC4301CDD#TRPBF, LTC4301CMS8#PBF, and LTC4301CMS8#TRPBF provide 2-channel, 400kHz I2C hotswap redriver functionality with restricted operating temperature range (0°C ~ 70°C). These parts are suitable for applications not requiring the full -40°C ~ 85°C industrial temperature range. Available in 8-DFN (3x3) and 8-MSOP packages. All are ROHS3 compliant with MSL Level 1 rating and Active product status.

Single-Channel Alternative

The NXP PCA9508D,118 provides 1-channel I2C hotswap redriver operation at 400kHz with 2.7V ~ 5.5V supply voltage and -40°C ~ 85°C operating temperature. This part is suitable only for applications requiring single-channel functionality. Supply current is 1mA. ROHS3 compliant with MSL Level 1 rating and Active product status.

Voltage Level Translator Alternative

The Texas Instruments TCA9517DR is a bidirectional voltage level translator with 2-channel operation and dual supply voltage support (0.9V ~ 5.5V and 2.7V ~ 5.5V). This part differs functionally from the PCA9517DR buffer/redriver and is suitable for applications requiring voltage translation between different logic levels. Operating temperature range is -40°C ~ 85°C. ROHS3 compliant with MSL Level 1 rating and Active product status.

Frequently Asked Questions (FAQ)

Q: Can the NXP PCA9517AD,118 directly replace the PCA9517DR?

A: The NXP PCA9517AD,118 provides functional equivalence as a 2-channel, 400kHz I2C buffer/redriver with matching supply voltage (2.7V ~ 5.5V) and operating temperature (-40°C ~ 85°C). The primary difference is package format (8-SO versus 8-SOIC) and increased supply current (5mA versus 1.5mA). PCB layout modifications are required due to package differences.

Q: What is the difference between the LTC4301 variants?

A: The LTC4301 family differs by temperature rating and packaging. The LTC4301I variants support -40°C ~ 85°C operating temperature, while LTC4301C variants are limited to 0°C ~ 70°C. Available packages include 8-DFN (3x3) for DD variants and 8-MSOP for MS8 variants. Packaging options are Tube (PBF) or Tape & Reel (TRPBF).

Q: Is the TCA9517DR a suitable replacement for the PCA9517DR?

A: The TCA9517DR is a voltage level translator, not a buffer/redriver. While it provides 2-channel operation in an 8-SOIC package with matching temperature range (-40°C ~ 85°C), its functional purpose differs from the PCA9517DR. Use only if voltage translation between different logic levels is required.

Q: Why does the PCA9508D,118 have only 1 channel?

A: The PCA9508D,118 is a single-channel I2C hotswap redriver. It is suitable only for applications requiring single-channel functionality. For 2-channel applications, use PCA9517AD,118, PCA9517D,118, or LTC4301 variants.

Q: What are the packaging implications when switching from 8-SOIC to 8-SO?

A: The 8-SOIC and 8-SO packages have identical pin counts and pitch but differ in physical dimensions and lead configuration. PCB footprint modifications are required. Verify component placement clearances and thermal management requirements before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original PCA9517DR specifications.

Q: Which substitute part has the lowest supply current?

A: The NXP PCA9508D,118 has the lowest supply current at 1mA, followed by the original PCA9517DR at 1.5mA. The NXP PCA9517 variants and Analog Devices LTC4301 variants draw 5mA and 4.5mA respectively.

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