PCA9544APWT Equivalent & Substitute Parts

Part Overview

The PCA9544APWT is a translating switch interface IC manufactured by Texas Instruments, designed for I2C and SMBus applications. This 20-TSSOP surface mount component operates across a supply voltage range of 2.3V to 5.5V and is classified as obsolete. Due to its obsolete status, identifying functionally equivalent substitute components is essential for ongoing system design, maintenance, and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	PCA9544APWT
Manufacturer	Texas Instruments
Category	Interface
Description	IC INTERFACE SPECIALIZED 20TSSOP
Interface Type	I2C, SMBus
Voltage - Supply	2.3V ~ 5.5V
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the PCA9544APWT are evaluated based on the following critical parameters:

Interface Protocol: I2C and/or SMBus compatibility
Package Type: Physical form factor and pin count compatibility
Supply Voltage Range: Operating voltage specifications
Mounting Type: Surface mount requirement
Product Status: Active or available alternatives to obsolete component
Compliance Standards: RoHS3 and REACH compliance

The substitute parts identified fall into two categories:

Category 1 - Direct Package Match (20-TSSOP): PCA9544APW,118 maintains identical package specifications and I2C/SMBus interface, offering the most direct substitution path.

Category 2 - Functional Alternative (Different Package): ADP5586ACBZ-00-R7 and TW3811-TC1-CR provide interface functionality but with different package types and interface protocols, requiring design-level evaluation.

Parameter Comparison

Parameter	PCA9544APWT (Main)	PCA9544APW,118	ADP5586ACBZ-00-R7	TW3811-TC1-CR
Manufacturer	Texas Instruments	NXP USA Inc.	Analog Devices Inc.	Renesas Electronics
Category	Interface	Interface	Interface	Interface
Description	IC INTERFACE SPECIALIZED 20TSSOP	IC INTERFACE SPECIALIZED 20TSSOP	IC INTFACE SPECIALIZED 16WLCSP	IC INTERFACE SPECIALIZED 100TQFP
Interface Type	I2C, SMBus	I2C, SMBus	I2C	MII, RMII
Voltage - Supply	2.3V ~ 5.5V	2.3V ~ 3.6V, 4.5V ~ 5.5V	1.65V ~ 3.6V	1.8V, 3.3V
Package / Case	20-TSSOP (0.173", 4.40mm Width)	20-TSSOP (0.173", 4.40mm Width)	16-UFBGA, WLCSP (1.59x1.59)	100-TQFP (12x12)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

PCA9544APW,118 is the primary substitute for PCA9544APWT. This NXP component maintains identical package specifications (20-TSSOP), matching interface protocols (I2C, SMBus), and equivalent supply voltage ranges. The part is currently active in production, ROHS3 compliant, and available in standard tape and reel packaging. This substitution requires no design modifications.

ADP5586ACBZ-00-R7 from Analog Devices provides I2C interface functionality but operates at a reduced supply voltage range (1.65V ~ 3.6V) and uses a different package format (16-WLCSP). This part is suitable only for applications where the lower voltage specification is acceptable and PCB layout can accommodate the smaller ball grid array package.

TW3811-TC1-CR from Renesas Electronics operates with different interface protocols (MII, RMII) and a significantly larger package (100-TQFP). This component is not functionally equivalent for I2C/SMBus applications and is listed only for reference in specialized networking interface scenarios.

All substitute candidates maintain ROHS3 compliance and REACH unaffected status, consistent with the original component's regulatory standing.

Frequently Asked Questions (FAQ)

Q: Can PCA9544APW,118 be used as a direct replacement for PCA9544APWT?

A: Yes. Both components share identical package specifications (20-TSSOP), interface protocols (I2C, SMBus), and compatible supply voltage ranges. The primary difference is product status: PCA9544APWT is obsolete while PCA9544APW,118 is active. No design modifications are required.

Q: What is the key difference in supply voltage between PCA9544APWT and PCA9544APW,118?

A: PCA9544APWT operates across 2.3V ~ 5.5V, while PCA9544APW,118 operates across 2.3V ~ 3.6V and 4.5V ~ 5.5V. Both ranges cover standard logic supply voltages; the substitute part specification is segmented into two ranges but covers the same practical operating window.

Q: Why is ADP5586ACBZ-00-R7 listed as a substitute if it has a different package?

A: ADP5586ACBZ-00-R7 provides I2C interface functionality and is included for applications where package size reduction is beneficial. However, the 16-WLCSP package requires different PCB layout and assembly processes compared to the 20-TSSOP format. This substitution is conditional on design compatibility.

Q: Is TW3811-TC1-CR suitable for I2C/SMBus applications?

A: No. TW3811-TC1-CR implements MII and RMII interface protocols, which are network-specific standards. This component is not functionally equivalent for I2C/SMBus translating switch applications.

Q: What is the moisture sensitivity level (MSL) difference, and does it matter?

A: PCA9544APWT, PCA9544APW,118, and ADP5586ACBZ-00-R7 all have MSL 1 (Unlimited), meaning no moisture bake-out is required before soldering. TW3811-TC1-CR has MSL 3 (168 Hours), requiring moisture control during storage and handling. For standard manufacturing environments, MSL 1 components offer greater handling flexibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute components are ROHS3 compliant and REACH unaffected, matching the regulatory compliance of the original PCA9544APWT.

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