MAX1609EEE I/O Expander SMBus Interface IC

Part Overview

The MAX1609EEE is an 8-channel I/O expander IC designed for SMBus communication at 100 kHz, manufactured by Analog Devices Inc./Maxim Integrated. This device operates across a supply voltage range of 2.7V to 5.5V and features open-drain output configuration with Power-On Reset (POR) functionality. The MAX1609EEE is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain compatibility with SMBus protocol, 8 I/O channels, 100 kHz clock frequency, and the 16-QSOP package form factor.

Substiute Parts

MAX1609EEE

Analog Devices Inc./Maxim IntegratedIn Stock: 2840MAX1609EEE Datasheet

Current PartRFQ

MAX1609EEE+

Analog Devices Inc./Maxim IntegratedIn Stock: 796MAX1609EEE+ Datasheet

DirectRFQ

MIC74YQS

Microchip TechnologyIn Stock: 19549MIC74YQS Datasheet

MFR RecommendedRFQ

NLVPCA9535EDTR2G

onsemiIn Stock: 5716NLVPCA9535EDTR2G Datasheet

MFR RecommendedRFQ

NLVPCA9535EMTTXG

onsemiIn Stock: 3857NLVPCA9535EMTTXG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the MAX1609EEE is based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

• Number of I/O channels: 8 channels
• Interface protocol: SMBus compatibility
• Clock frequency: 100 kHz operation
• Package form factor: 16-QSOP or compatible surface-mount package
• Output configuration: Open-drain topology
• Supply voltage compatibility: Minimum 2.7V operation

Substitution Categories:

Category 1: Direct Form Factor Match (16-QSOP) Parts maintaining identical 16-QSOP packaging with 8 I/O channels and SMBus interface. MAX1609EEE+ qualifies as a direct successor with active product status and improved RoHS3 compliance.

Category 2: Functional Equivalents with Interface Expansion Parts offering 8 I/O channels with dual-protocol support (I2C and SMBus) in alternative packages. MIC74YQS provides I2C/SMBus compatibility with interrupt output capability, though supply voltage is limited to 2.7V ~ 3.6V.

Category 3: Extended I/O Capacity Alternatives Parts providing 16 I/O channels with I2C interface in larger packages. NLVPCA9535EDTR2G (24-TSSOP) and NLVPCA9535EMTTXG (24-WQFN) offer expanded functionality with wider operating temperature ranges (-55°C ~ 125°C) and extended supply voltage (1.65V ~ 5.5V), suitable for applications requiring additional I/O expansion.

Parameter Comparison

Engineering Selection Recommendations

Preferred Primary Substitute: MAX1609EEE+

The MAX1609EEE+ is the recommended direct replacement for the obsolete MAX1609EEE. This part maintains identical electrical specifications, pinout compatibility, and 16-QSOP package form factor. The MAX1609EEE+ carries active product status and achieves ROHS3 compliance, addressing regulatory requirements for new production. Inventory availability of 739 units supports immediate implementation. No design modifications are required for this substitution.

Secondary Substitute for SMBus Applications: MIC74YQS

The MIC74YQS from Microchip Technology provides SMBus and I2C dual-protocol support with 8 I/O channels in 16-SSOP packaging. This part is suitable for applications requiring interrupt output capability. However, the supply voltage range is constrained to 2.7V ~ 3.6V, which is narrower than the original MAX1609EEE specification. Verification of system supply voltage compatibility is required before selection. ROHS3 compliance and high inventory availability (19,528 units) support production deployment.

Alternative Substitutes for Extended Functionality: NLVPCA9535 Series

The NLVPCA9535EDTR2G and NLVPCA9535EMTTXG are suitable for applications where I/O expansion beyond 8 channels is beneficial. NLVPCA9535EDTR2G provides 16 I/O channels in 24-TSSOP packaging, while NLVPCA9535EMTTXG offers 8 I/O channels in 24-WQFN packaging. Both parts feature extended operating temperature range (-55°C ~ 125°C) and wider supply voltage tolerance (1.65V ~ 5.5V). These parts support I2C protocol with interrupt output functionality. PCB layout modifications are necessary due to different package geometries.

Frequently Asked Questions (FAQ)

Q1: Can MAX1609EEE+ be used as a direct replacement without PCB modifications?

A: Yes. The MAX1609EEE+ maintains identical pinout, package form factor (16-SSOP), and electrical specifications as the MAX1609EEE. No PCB layout changes are required. The part is a direct successor with improved compliance status.

Q2: What is the primary difference between MAX1609EEE and MIC74YQS?

A: Both parts provide 8 I/O channels and 100 kHz clock frequency in 16-SSOP packaging. The MIC74YQS adds interrupt output capability and dual I2C/SMBus protocol support. However, MIC74YQS supply voltage is limited to 2.7V ~ 3.6V compared to MAX1609EEE's 2.7V ~ 5.5V range. System voltage compatibility must be verified.

Q3: Why would NLVPCA9535 series be selected over MAX1609EEE+?

A: NLVPCA9535 series parts are selected when applications require more than 8 I/O channels or extended operating temperature range (-55°C ~ 125°C). These parts support I2C protocol with interrupt output. Trade-offs include larger package footprint and PCB redesign requirements.

Q4: Are all substitute parts RoHS compliant?

A: MAX1609EEE+ and MIC74YQS are ROHS3 compliant. NLVPCA9535EDTR2G and NLVPCA9535EMTTXG are also ROHS3 compliant. The original MAX1609EEE is RoHS non-compliant. Compliance requirements should be verified against system specifications.

Q5: What is the impact of package differences on PCB design?

A: MAX1609EEE+ uses identical 16-SSOP packaging and requires no PCB changes. MIC74YQS also uses 16-SSOP. NLVPCA9535EDTR2G requires 24-TSSOP footprint, and NLVPCA9535EMTTXG requires 24-WQFN (4x4) footprint. Larger packages necessitate PCB layout modifications and may require increased board space allocation.

Q6: Is SMBus protocol compatibility maintained across all substitutes?

A: MAX1609EEE+ maintains full SMBus compatibility. MIC74YQS supports both I2C and SMBus protocols. NLVPCA9535 series supports I2C protocol only; SMBus compatibility is not specified. Applications requiring strict SMBus protocol should select MAX1609EEE+ or MIC74YQS.

Q7: What inventory considerations apply to substitute selection?

A: MAX1609EEE+ has 739 units available. MIC74YQS has 19,528 units available. NLVPCA9535EDTR2G has 5,668 units available. NLVPCA9535EMTTXG has 3,819 units available. Inventory levels support production requirements across all options.