PCA9508D,112 Equivalent & Substitute Parts

Part Overview

The PCA9508D,112 is an I2C ReDriver buffer interface component manufactured by NXP USA Inc., designed for single-channel 400kHz I2C hotswap applications. This part operates across a 2.7V to 5.5V supply range with minimal current draw of 1mA and is housed in an 8-SO surface mount package. The component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer	NXP USA Inc.
Part Number	PCA9508D,112
Category	Interface - Buffer, ReDriver
Application	I2C Hotswap
Data Rate (Max)	400kHz
Number of Channels	1
Voltage Supply Range	2.7V ~ 5.5V
Current Supply	1mA
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the PCA9508D,112 is determined by the following critical parameters:

Primary Substitution Criteria:

I2C interface compatibility (2-Wire Bus input/output)
400kHz data rate support
Single-channel configuration
2.7V ~ 5.5V supply voltage range
Operating temperature range -40°C ~ 85°C
Surface mount package compatibility

Secondary Considerations:

Input capacitance tolerance (5.2 pF nominal)
Current supply efficiency (1mA baseline)
RoHS3 compliance and REACH unaffected status
Product status and availability

Substitute parts are grouped into two categories: direct functional equivalents maintaining identical electrical specifications and package form factors, and alternative package variants that preserve core I2C ReDriver functionality while offering different mounting or thermal characteristics.

Parameter Comparison

Parameter	PCA9508D,112	PCA9517DR	P82B96DGKR	P82B96PWR	PI6ULS5V9509UEX	TCA9509DGKR	TCA9509RVHR
Manufacturer	NXP USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Diodes Incorporated	Texas Instruments	Texas Instruments
Data Rate (Max)	400kHz	400kHz	400kHz	400kHz	400kHz	400kHz	400kHz
Number of Channels	1	2	2	2	1	1	1
Voltage Supply Range	2.7V ~ 5.5V	0.9V ~ 5.5V, 2.7V ~ 5.5V	2V ~ 15V	2V ~ 15V	3V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V
Current Supply	1mA	1.5mA	4mA	4mA	3mA	3mA	3mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-SOIC	8-SOIC	8-TSSOP, 8-MSOP	8-TSSOP	8-TSSOP, 8-MSOP	8-TSSOP, 8-MSOP	8-XFQFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Not For New Designs	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

TCA9509DGKR and TCA9509RVHR are the preferred substitutes. Both maintain single-channel I2C ReDriver functionality, identical 400kHz data rate, matching 2.7V ~ 5.5V supply range, and full -40°C ~ 85°C operating temperature coverage. Both are active products with ROHS3 compliance. TCA9509DGKR uses 8-VSSOP packaging (8-TSSOP, 8-MSOP variant), while TCA9509RVHR offers 8-XFQFN Exposed Pad for improved thermal performance. Current supply is 3mA versus the original 1mA.

Secondary Substitutes (Functional Equivalents with Trade-offs):

PI6ULS5V9509UEX from Diodes Incorporated provides single-channel 400kHz I2C ReDriver functionality in 8-MSOP package with active product status. Supply voltage range is restricted to 3V ~ 5.5V, narrower than the original 2.7V ~ 5.5V specification. Current supply is 3mA. Operating temperature range is not specified in available data.

PCA9517DR from Texas Instruments offers 400kHz I2C ReDriver capability but with dual-channel configuration versus the single-channel requirement. Supply voltage range includes 2.7V ~ 5.5V compatibility. Product status is "Not For New Designs," limiting suitability for new applications.

Alternative Package Options:

P82B96DGKR and P82B96PWR provide dual-channel 400kHz I2C ReDriver functionality in 8-VSSOP and 8-TSSOP packages respectively. Both are active products with ROHS3 compliance. Supply voltage range extends to 2V ~ 15V, exceeding original specifications. Current supply is 4mA. These parts are suitable when dual-channel capability is beneficial or when extended voltage range is required.

Compliance and Availability:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory posture. Inventory availability is confirmed for all listed substitutes, with TCA9509DGKR showing highest stock levels at 60,300 pieces.

Frequently Asked Questions (FAQ)

Q: Can I use a dual-channel ReDriver as a substitute for the single-channel PCA9508D,112?

A: Dual-channel parts such as PCA9517DR, P82B96DGKR, and P82B96PWR can function as substitutes if your application requires only single-channel operation. The additional channel remains unused. Verify that the supply voltage range and current requirements are compatible with your circuit design.

Q: What is the difference between 8-SOIC, 8-VSSOP, and 8-TSSOP packages?

A: These are all 8-pin surface mount packages with different physical dimensions. 8-SOIC (0.154" width) is the original package. 8-VSSOP and 8-TSSOP (0.118" to 0.173" width) are smaller footprints suitable for space-constrained designs. PCB layout and reflow profile compatibility must be verified before substitution.

Q: Are there supply voltage restrictions when substituting with PI6ULS5V9509UEX?

A: Yes. PI6ULS5V9509UEX operates within 3V ~ 5.5V, whereas the original PCA9508D,112 supports 2.7V ~ 5.5V. This substitute is not suitable for applications requiring operation below 3V supply voltage.

Q: What is the significance of "Active" versus "Obsolete" product status?

A: Active products have ongoing manufacturing support and guaranteed availability. Obsolete products have reached end-of-life and may have limited stock. Substituting with active products ensures long-term supply chain reliability and design continuity.

Q: Does the increased current consumption of substitute parts affect circuit design?

A: The original PCA9508D,112 draws 1mA, while most substitutes draw 3mA to 4mA. Verify that your power supply and thermal design accommodate this increase. For battery-powered applications, the higher current may impact operating time.

Q: Is the 8-XFQFN package of TCA9509RVHR compatible with existing PCB layouts designed for 8-SOIC?

A: No. The 8-XFQFN Exposed Pad package has different footprint dimensions and pin spacing than 8-SOIC. PCB redesign is required for this substitution. Use TCA9509DGKR in 8-VSSOP packaging for closer form factor compatibility.

Q: What certifications and compliance standards apply to these substitute parts?

A: All listed substitutes are ROHS3 compliant and REACH unaffected, matching the original part's regulatory status. ECCN classification is EAR99 for all parts, and HTSUS codes are 8542.39.0001 or 8542.39.0060, confirming equivalent tariff classification.

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