PCA9509ADP,118 Equivalent & Substitute Parts

Part Overview

The PCA9509ADP,118 is a 2-channel I2C buffer/redriver interface component manufactured by NXP USA Inc., designed for 2-wire bus signal conditioning at data rates up to 400kHz. This part operates across a supply voltage range of 2.3V to 5.5V with minimal supply current of 5µA, housed in an 8-TSSOP surface mount package.

The PCA9509ADP,118 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Active alternatives provide comparable or enhanced functionality while maintaining compatibility with existing circuit designs.

Key Parameters

Parameter	Value
Type	Buffer, ReDriver
Number of Channels	2
Data Rate (Max)	400kHz
Input/Output	2-Wire Bus
Voltage - Supply	2.3V ~ 5.5V
Current - Supply	5µA
Capacitance - Input	2 pF
Operating Temperature	-40°C ~ 85°C
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the PCA9509ADP,118 is determined by the following critical parameters:

Channel Configuration: 2-channel operation for dual I2C line buffering
Data Rate Compatibility: 400kHz maximum operation
Bus Interface: 2-wire bus input and output
Supply Voltage Range: Minimum 2.3V support for low-power applications
Package Compatibility: 8-TSSOP or 8-MSOP surface mount form factor
Operating Temperature Range: -40°C to 85°C industrial grade
Compliance: ROHS3 compliance for regulatory alignment

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (Same Channel Count & Type) Parts maintaining 2-channel buffer/redriver functionality with identical electrical specifications and package compatibility.

Category 2: Functional Alternatives (Enhanced Capability) Parts offering 2-channel buffer/accelerator functionality with hotswap capability, providing extended supply voltage range and enhanced performance characteristics while maintaining core I2C interface compatibility.

Parameter Comparison

Part Number	Manufacturer	Type	Channels	Data Rate	Supply Voltage	Supply Current	Input Capacitance	Operating Temp	Package	Product Status
PCA9509ADP,118	NXP USA Inc.	Buffer, ReDriver	2	400kHz	2.3V ~ 5.5V	5µA	2 pF	-40°C ~ 85°C	8-TSSOP	Obsolete
PCA9509PDP,118	NXP Semiconductors	Buffer, ReDriver	2	400kHz	3V ~ 5.5V	3mA	2 pF	-40°C ~ 85°C	8-TSSOP	Active
PI6ULS5V9509UEX	Diodes Incorporated	Buffer, ReDriver	1	400kHz	3V ~ 5.5V	3mA	6 pF	Not Specified	8-MSOP	Active
LTC4300-2CMS8#PBF	Linear Technology	Buffer, Accelerator	2	400kHz	2.7V ~ 5.5V	5.1mA	10 pF	0°C ~ 70°C	8-MSOP	Active
LTC4300-2CMS8#TRPBF	Analog Devices Inc.	Buffer, Accelerator	2	400kHz	2.7V ~ 5.5V	5.1mA	10 pF	0°C ~ 70°C	8-MSOP	Active
LTC4300-2IMS8#PBF	Analog Devices Inc.	Buffer, Accelerator	2	400kHz	2.7V ~ 5.5V	5.1mA	10 pF	-40°C ~ 85°C	8-MSOP	Active
LTC4300-2IMS8#TRPBF	Analog Devices Inc.	Buffer, Accelerator	2	400kHz	2.7V ~ 5.5V	5.1mA	10 pF	-40°C ~ 85°C	8-MSOP	Active
LTC4300A-2CMS8#PBF	Analog Devices Inc.	Buffer, Accelerator	2	400kHz	2.7V ~ 5.5V	5.1mA	10 pF	0°C ~ 70°C	8-MSOP	Active
LTC4300A-2CMS8#TRPBF	Analog Devices Inc.	Buffer, Accelerator	2	400kHz	2.7V ~ 5.5V	5.1mA	10 pF	0°C ~ 70°C	8-MSOP	Active
LTC4300A-2IMS8#PBF	Analog Devices Inc.	Buffer, Accelerator	2	400kHz	2.7V ~ 5.5V	5.1mA	10 pF	-40°C ~ 85°C	8-MSOP	Active
LTC4300A-2IMS8#TRPBF	Analog Devices Inc.	Buffer, Accelerator	2	400kHz	2.7V ~ 5.5V	5.1mA	10 pF	-40°C ~ 85°C	8-MSOP	Active

Engineering Selection Recommendations

Primary Recommendation: PCA9509PDP,118

The PCA9509PDP,118 is the direct active equivalent from NXP Semiconductors. It maintains identical 2-channel buffer/redriver functionality, 400kHz data rate, and 8-TSSOP package form factor. This part is ROHS3 compliant and carries active product status. The primary design consideration is the reduced supply voltage minimum (3V versus 2.3V) and increased supply current (3mA versus 5µA). Applications requiring operation below 3V supply voltage must evaluate alternative solutions.

Secondary Recommendation: LTC4300-2IMS8#TRPBF or LTC4300A-2IMS8#TRPBF

These Analog Devices parts offer 2-channel buffer/accelerator functionality with extended operating temperature range (-40°C to 85°C), matching the original part's temperature specification. Both maintain 400kHz data rate and 2-wire bus interface. The LTC4300A variant represents the latest generation. These parts are ROHS3 compliant and carry active product status. The supply voltage minimum of 2.7V is higher than the original 2.3V specification. Hotswap capability provides enhanced functionality for applications requiring dynamic bus connection/disconnection.

Alternative for Single-Channel Applications: PI6ULS5V9509UEX

The Diodes Incorporated PI6ULS5V9509UEX provides single-channel operation and is suitable only for applications requiring one I2C line buffering. This part is not recommended as a direct substitute for dual-channel designs.

Frequently Asked Questions (FAQ)

Q: Can PCA9509PDP,118 replace PCA9509ADP,118 in all applications?

A: PCA9509PDP,118 is functionally equivalent with identical channel count, data rate, and package. The primary difference is minimum supply voltage (3V versus 2.3V). Applications operating at supply voltages below 3V require alternative solutions. All other electrical and mechanical parameters are compatible.

Q: What is the difference between buffer/redriver and buffer/accelerator types?

A: Buffer/redriver components restore signal integrity on I2C buses. Buffer/accelerator components (LTC4300 series) add hotswap capability, allowing safe connection and disconnection of I2C devices during operation. Both types maintain 2-wire bus compatibility and 400kHz data rate operation.

Q: Are LTC4300 and LTC4300A parts interchangeable?

A: LTC4300A represents an updated generation with identical electrical specifications and package compatibility. Both maintain 2-channel operation, 400kHz data rate, and 8-MSOP package form factor. LTC4300A is the current active product line.

Q: Why does PI6ULS5V9509UEX show only 1 channel?

A: PI6ULS5V9509UEX is a single-channel device and cannot serve as a direct substitute for the 2-channel PCA9509ADP,118. This part is listed as a related alternative but does not meet the dual-channel requirement of the original design.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR) for automated assembly, Tube for manual handling, and Bulk for large-volume procurement. The 8-TSSOP and 8-MSOP package cases maintain identical 0.118" width and 3.00mm body dimensions, ensuring PCB footprint compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts carry ROHS3 compliance certification, meeting regulatory requirements for hazardous substance restrictions. Compliance status is consistent across all active alternatives.

Q: What is the operating temperature consideration when selecting a substitute?

A: The original PCA9509ADP,118 operates from -40°C to 85°C. LTC4300-2CMS8 and LTC4300A-2CMS8 variants operate from 0°C to 70°C, limiting use in extended temperature applications. LTC4300-2IMS8 and LTC4300A-2IMS8 variants maintain the full -40°C to 85°C range, matching the original specification.

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