PCA9509D,112 Equivalent & Substitute Parts

Part Overview

The PCA9509D,112 is a 2-channel I2C buffer and redriver IC manufactured by NXP USA Inc., designed for 400kHz I2C bus applications. This Surface Mount device in 8-SOIC packaging operates across a 3V to 5.5V supply range with 3mA current consumption and supports operating temperatures from -40°C to 85°C.

The PCA9509D,112 carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this interface component.

Key Parameters

Parameter	Value
Manufacturer Part Number	PCA9509D,112
Manufacturer	NXP USA Inc.
Category	Interface
Type	Buffer, ReDriver
Applications	I2C
Number of Channels	2
Data Rate (Max)	400kHz
Input/Output	2-Wire Bus
Voltage - Supply	3V ~ 5.5V
Current - Supply	3mA
Capacitance - Input	2 pF
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PCA9509D,112 is determined by the following critical parameters:

Channel Configuration: 2-channel I2C buffer/redriver capability
Data Rate: 400kHz maximum I2C bus speed support
Supply Voltage Range: 3V to 5.5V operation
Current Consumption: 3mA supply current
Input Capacitance: 2 pF specification
Package Type: Surface Mount configuration
Operating Temperature Range: -40°C to 85°C
Compliance: ROHS3 Compliant, REACH Unaffected

Substitute parts are grouped based on functional equivalence within these parameters. Parts maintaining the 2-channel configuration, 400kHz data rate, and compatible voltage/current specifications are classified as direct functional equivalents. Parts with differing channel counts, package types, or voltage ranges represent alternative solutions for specific design constraints.

Parameter Comparison

Part Number	Manufacturer	Channels	Data Rate (Max)	Voltage - Supply	Current - Supply	Capacitance - Input	Package / Case	Mounting Type	Product Status
PCA9509D,112	NXP USA Inc.	2	400kHz	3V ~ 5.5V	3mA	2 pF	8-SOIC (0.154", 3.90mm)	Surface Mount	Obsolete
PCA9509DP,118	NXP USA Inc.	2	400kHz	3V ~ 5.5V	3mA	2 pF	8-TSSOP (0.118", 3.00mm)	Surface Mount	Active
P82B715P	Texas Instruments	1	—	4.5V ~ 12V	22mA	3000 pF	8-DIP (0.300", 7.62mm)	Through Hole	Active
P82B96DGKR	Texas Instruments	2	400kHz	2V ~ 15V	4mA	4 pF	8-TSSOP (0.118", 3.00mm)	Surface Mount	Active
P82B96P	Texas Instruments	2	400kHz	2V ~ 15V	4mA	4 pF	8-DIP (0.300", 7.62mm)	Through Hole	Active
P82B96PW	Texas Instruments	2	400kHz	2V ~ 15V	4mA	4 pF	8-TSSOP (0.173", 4.40mm)	Surface Mount	Last Time Buy
P82B96PWR	Texas Instruments	2	400kHz	2V ~ 15V	4mA	4 pF	8-TSSOP (0.173", 4.40mm)	Surface Mount	Active
PI6ULS5V9509UEX	Diodes Incorporated	1	400kHz	3V ~ 5.5V	3mA	6 pF	8-TSSOP (0.118", 3.00mm)	Surface Mount	Active
TCA9509DGKR	Texas Instruments	1	400kHz	2.7V ~ 5.5V	3mA	6.5 pF	8-TSSOP (0.118", 3.00mm)	Surface Mount	Active
TCA9509RVHR	Texas Instruments	1	400kHz	2.7V ~ 5.5V	3mA	6.5 pF	8-XFQFN Exposed Pad	Surface Mount	Active

Engineering Selection Recommendations

Direct Functional Equivalent (Recommended Primary Substitute):

PCA9509DP,118 from NXP USA Inc. maintains identical electrical specifications to the PCA9509D,112, including 2-channel configuration, 400kHz data rate, 3V to 5.5V supply voltage, 3mA current consumption, and 2 pF input capacitance. The primary difference is package format: 8-TSSOP versus 8-SOIC. This part carries Active product status and is ROHS3 Compliant with MSL 1 rating, ensuring long-term availability and compliance continuity.

Alternative Substitutes with Extended Voltage Range:

P82B96DGKR, P82B96P, P82B96PW, and P82B96PWR from Texas Instruments provide 2-channel I2C buffer/redriver functionality at 400kHz with extended supply voltage range (2V to 15V). These parts maintain 400kHz data rate and 2-channel configuration but feature 4mA supply current and 4 pF input capacitance. All carry Active or Last Time Buy status with ROHS3 compliance. Package options include 8-TSSOP and 8-DIP configurations.

Single-Channel Alternatives:

PI6ULS5V9509UEX (Diodes Incorporated), TCA9509DGKR, and TCA9509RVHR provide single-channel I2C buffer/redriver functionality at 400kHz. These parts are suitable for applications requiring single-channel operation and carry Active product status with ROHS3 compliance. PI6ULS5V9509UEX maintains 3V to 5.5V supply range matching the original part. TCA9509 variants support 2.7V to 5.5V supply range.

Legacy Through-Hole Option:

P82B715P from Texas Instruments provides through-hole mounting in 8-DIP package with single-channel configuration. This part operates across 4.5V to 12V supply range and is suitable for legacy board designs requiring through-hole components.

Frequently Asked Questions (FAQ)

Q: Can PCA9509DP,118 directly replace PCA9509D,112 in existing designs?

A: PCA9509DP,118 provides electrical equivalence with identical specifications. The primary design consideration is package footprint: PCA9509DP,118 uses 8-TSSOP (0.118" width) versus PCA9509D,112 in 8-SOIC (0.154" width). PCB layout modifications are required for package transition.

Q: What is the difference between 2-channel and 1-channel I2C buffer options?

A: The PCA9509D,112 provides 2-channel I2C bus buffering, supporting simultaneous conditioning of both SDA and SCL lines. Single-channel alternatives (PI6ULS5V9509UEX, TCA9509DGKR, TCA9509RVHR) condition one bus line and require dual-part implementation for full 2-wire bus support.

Q: Are P82B96 series parts compatible with 3V to 5.5V supply designs?

A: P82B96 series parts operate across 2V to 15V supply range, which encompasses 3V to 5.5V operation. These parts are electrically compatible with 3V to 5.5V designs. However, input capacitance increases from 2 pF to 4 pF, which may affect I2C bus timing characteristics in bandwidth-constrained applications.

Q: What mounting considerations apply when transitioning from 8-SOIC to 8-TSSOP packaging?

A: 8-SOIC and 8-TSSOP packages differ in physical dimensions and pin pitch. 8-TSSOP features reduced width (0.118" to 0.173" depending on variant) compared to 8-SOIC (0.154"). PCB footprint redesign is required. Pin assignments remain consistent across package variants for the same base part number.

Q: Which substitute parts maintain the lowest supply current consumption?

A: PCA9509DP,118, PI6ULS5V9509UEX, TCA9509DGKR, and TCA9509RVHR all maintain 3mA supply current matching the original PCA9509D,112 specification. P82B96 series parts consume 4mA. P82B715P requires 22mA and is suitable only for applications where increased current consumption is acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts carry ROHS3 Compliant status and REACH Unaffected designation, matching the compliance profile of the original PCA9509D,112.

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