TCA6416RTWR Equivalent & Substitute Parts

Part Overview

The TCA6416RTWR is a 16-bit I/O expander from Texas Instruments designed for I2C and SMBus communication at 400 kHz. This device is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary for ongoing system support, design updates, and procurement continuity. Active alternatives from other manufacturers provide equivalent functionality with improved availability and extended product lifecycles.

Substiute Parts

TCA6416RTWR

Texas InstrumentsIn Stock: 2114TCA6416RTWR Datasheet

Current PartRFQ

PCAL6416AHF,128

NXP USA Inc.In Stock: 866363PCAL6416AHF,128 Datasheet

DirectRFQ

MAX7326AEG+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1032MAX7326AEG+T Datasheet

MFR RecommendedRFQ

MCP23016-I/ML

Microchip TechnologyIn Stock: 2045MCP23016-I/ML Datasheet

MFR RecommendedRFQ

MCP23016-I/SP

Microchip TechnologyIn Stock: 1000417MCP23016-I/SP Datasheet

MFR RecommendedRFQ

MCP23016-I/SS

Microchip TechnologyIn Stock: 1521MCP23016-I/SS Datasheet

MFR RecommendedRFQ

MCP23016T-I/SO

Microchip TechnologyIn Stock: 3494MCP23016T-I/SO Datasheet

MFR RecommendedRFQ

MCP23016T-I/SS

Microchip TechnologyIn Stock: 856MCP23016T-I/SS Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TCA6416RTWR is determined by strict alignment of the following electrical and mechanical parameters:

Core Electrical Requirements:

• 16 I/O channels
• I2C interface at 400 kHz minimum
• Interrupt output capability
• Push-Pull output type
• Supply voltage range compatibility (minimum 1.65V ~ 5.5V)
• Operating temperature range of -40°C ~ 85°C or better

Mechanical Considerations:

• Surface mount packaging only (through-hole variants are not direct substitutes for this application)
• Package footprint compatibility or functional equivalence

Substitute parts are grouped into two categories:

Category 1: Direct Pin-Compatible Substitutes (24-pin packages)

• PCAL6416AHF,128 (NXP) - 24-HWQFN package, identical pincount and footprint

Category 2: Functional Equivalents (28-pin packages)

• MCP23016 series (Microchip) - Available in multiple packages (28-QFN, 28-SPDIP, 28-SSOP, 28-SOIC)
• MAX7326AEG+T (Analog Devices/Maxim) - 24-QSOP package

These alternatives meet all core electrical requirements and maintain I2C/SMBus 400 kHz operation with 16 I/O channels and interrupt outputs.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Minimal PCB Changes): PCAL6416AHF,128 from NXP is the optimal choice for direct substitution. It maintains the 24-pin WQFN package footprint, identical I/O count, and equivalent electrical specifications. The device is in active production status with unlimited MSL rating, ensuring long-term availability and reliability. The addition of open-drain output capability provides design flexibility beyond the original TCA6416RTWR.

For Functional Equivalence with Package Flexibility: The MCP23016 series from Microchip offers multiple packaging options (28-QFN, 28-SOIC, 28-SSOP, 28-SPDIP) for different assembly requirements. All variants maintain 16 I/O channels, I2C 400 kHz operation, and interrupt outputs. These devices are in active production with unlimited MSL ratings. Package selection depends on PCB assembly capabilities and space constraints.

For Extended Temperature Range: MAX7326AEG+T from Analog Devices/Maxim provides an operating temperature range of -40°C ~ 125°C, exceeding the TCA6416RTWR specification. This option is suitable for applications requiring enhanced thermal performance. The 24-QSOP package offers a compact footprint alternative to the original 24-WQFN.

All recommended substitutes are ROHS3 compliant and maintain compliance with REACH and EAR99 export classifications.

Frequently Asked Questions (FAQ)

Q: Can PCAL6416AHF,128 be used as a direct drop-in replacement for TCA6416RTWR? A: PCAL6416AHF,128 is functionally equivalent with identical pincount and footprint compatibility. Both devices feature 16 I/O channels, I2C/SMBus 400 kHz operation, and interrupt outputs. The NXP device adds open-drain output capability as an additional feature. PCB layout modifications are not required for this substitution.

Q: What is the key difference between 24-pin and 28-pin I/O expander packages? A: The TCA6416RTWR uses a 24-pin WQFN package, while MCP23016 variants use 28-pin packages (QFN, SOIC, SSOP, SPDIP). The additional pins in the 28-pin package provide different ground and power distribution options. PCB redesign is necessary when switching between these package families.

Q: Are MCP23016 devices compatible with SMBus protocol? A: MCP23016 devices support I2C protocol at 400 kHz. While they do not explicitly list SMBus compatibility, I2C 400 kHz operation is compatible with SMBus 2.0 specifications. System-level validation is recommended if SMBus-specific features are required.

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings? A: TCA6416RTWR has MSL 2 (1 Year), requiring controlled storage conditions. All substitute parts listed have MSL 1 (Unlimited), eliminating moisture sensitivity concerns and simplifying inventory management and long-term storage.

Q: Can I use MCP23016-I/SP (through-hole DIP package) in a surface-mount design? A: MCP23016-I/SP is a through-hole component and is not suitable for surface-mount PCB designs. For surface-mount applications, use MCP23016-I/ML (28-QFN), MCP23016-I/SS (28-SSOP), or MCP23016T-I/SO (28-SOIC) variants.

Q: What is the minimum supply voltage for each substitute part? A: PCAL6416AHF,128 and TCA6416RTWR support 1.65V minimum. MAX7326AEG+T supports 1.71V minimum. MCP23016 series supports 2V minimum. System design must account for the highest minimum voltage requirement when selecting a substitute.

Q: Are all listed substitutes ROHS3 compliant? A: Yes, all substitute parts listed are ROHS3 compliant and REACH unaffected, matching the compliance status of the original TCA6416RTWR.