MAX1608EEE+ Equivalent & Substitute Parts Reference

Part Overview

The MAX1608EEE+ is an 8-channel I/O expander interface component manufactured by Analog Devices Inc./Maxim Integrated. This SMBus-based expander operates at 100 kHz and is housed in a 16-QSOP surface mount package. The device maintains active product status with 645 units in current inventory stock.

Substitute parts become necessary when the MAX1608EEE+ reaches end-of-life status, when supply constraints occur, or when design requirements shift toward alternative interface protocols or expanded I/O channel counts. The primary substitute identified is the NLVPCA9535EDTR2G from onsemi, which offers expanded functionality at the cost of interface protocol and package differences.

Key Parameters

Parameter	MAX1608EEE+
Manufacturer	Analog Devices Inc./Maxim Integrated
Number of I/O Channels	8
Interface Protocol	SMBus
Clock Frequency	100 kHz
Supply Voltage Range	2.7V ~ 5.5V
Operating Temperature Range	-40°C ~ 85°C
Output Type	Open Drain
Package Type	16-QSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Active
RoHS Compliance	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MAX1608EEE+ is determined by the following critical parameters:

Clock Frequency: 100 kHz operation is the baseline requirement
Output Type: Open Drain configuration must be maintained
Supply Voltage Compatibility: Operating range must encompass or exceed 2.7V ~ 5.5V
Operating Temperature Range: Must support -40°C ~ 85°C minimum
RoHS & Environmental Compliance: ROHS3 compliance and REACH status alignment
Mounting Type: Surface mount technology required
Interface Protocol: SMBus or I2C compatibility (I2C is a superset of SMBus)

The NLVPCA9535EDTR2G qualifies as a substitute despite differences in I/O channel count (16 vs. 8), package type (24-TSSOP vs. 16-QSOP), and interface protocol (I2C vs. SMBus) because it meets all critical electrical and environmental parameters. However, these differences require design-level evaluation for PCB layout, firmware protocol handling, and functional requirements.

Parameter Comparison

Parameter	MAX1608EEE+	NLVPCA9535EDTR2G	Notes
Manufacturer	Analog Devices Inc./Maxim Integrated	onsemi	Different manufacturers
Number of I/O Channels	8	16	Substitute offers expanded I/O capacity
Interface Protocol	SMBus	I2C	I2C is protocol superset; firmware adaptation required
Clock Frequency	100 kHz	100 kHz	Matched
Supply Voltage Range	2.7V ~ 5.5V	1.65V ~ 5.5V	Substitute supports lower voltage operation
Operating Temperature Range	-40°C ~ 85°C	-55°C ~ 125°C	Substitute supports extended temperature range
Output Type	Open Drain	Open Drain	Matched
Package Type	16-QSOP (0.154", 3.90mm Width)	24-TSSOP (0.173", 4.40mm Width)	Different packages; PCB redesign required
Mounting Type	Surface Mount	Surface Mount	Matched
Product Status	Active	Obsolete	Substitute is end-of-life; verify long-term availability
RoHS Compliance	ROHS3 Compliant	ROHS3 Compliant	Matched
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Matched

Engineering Selection Recommendations

MAX1608EEE+ (Primary Selection)

The MAX1608EEE+ remains the preferred component for new designs and ongoing production. Active product status ensures long-term availability and supply chain stability. ROHS3 compliance and unlimited moisture sensitivity level support standard manufacturing and storage practices. The 16-QSOP package provides a compact footprint suitable for space-constrained applications.

NLVPCA9535EDTR2G (Substitute Selection)

The NLVPCA9535EDTR2G is suitable as a substitute only when the MAX1608EEE+ becomes unavailable or when design requirements specifically call for expanded I/O capacity (16 channels vs. 8 channels). The obsolete product status of the NLVPCA9535EDTR2G requires verification of remaining inventory and long-term supply viability before committing to production use. The I2C interface requires firmware protocol adaptation from SMBus implementations. The larger 24-TSSOP package necessitates PCB layout redesign. The extended operating temperature range (-55°C ~ 125°C) and lower minimum supply voltage (1.65V) provide additional design flexibility if required by application specifications.

Frequently Asked Questions (FAQ)

Q: Can the NLVPCA9535EDTR2G directly replace the MAX1608EEE+ without design changes?

A: No. While both devices share 100 kHz clock frequency, open drain output type, and equivalent environmental compliance, three critical differences require design-level modifications: (1) Interface protocol differs (I2C vs. SMBus), requiring firmware adaptation; (2) Package type differs (24-TSSOP vs. 16-QSOP), requiring PCB layout redesign; (3) I/O channel count differs (16 vs. 8), requiring functional evaluation of whether expanded capacity is beneficial or requires software management.

Q: What is the primary reason to consider substitution?

A: The MAX1608EEE+ maintains active product status with adequate inventory. Substitution becomes relevant only upon end-of-life announcement, supply disruption, or when design requirements shift toward I2C protocol or expanded I/O channel capacity.

Q: Are there compatibility concerns with the I2C vs. SMBus interface difference?

A: I2C is a protocol superset that encompasses SMBus functionality. Devices designed for SMBus can operate on I2C buses, but firmware must be adapted to handle I2C-specific command sets and timing requirements. Existing SMBus firmware will not function without modification on an I2C device.

Q: Does the NLVPCA9535EDTR2G's obsolete status affect its suitability?

A: Yes. Obsolete status indicates the manufacturer has discontinued production. Remaining inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. Verify available stock quantities and lead times before selecting this substitute for production commitments.

Q: What are the package implications of switching from 16-QSOP to 24-TSSOP?

A: The 24-TSSOP package is physically larger (0.173" vs. 0.154" width) and contains 24 pins instead of 16. This requires complete PCB footprint redesign, trace routing modifications, and potential changes to board layout strategy. The increased pin count accommodates the expanded 16-channel I/O capacity.

Q: Are the supply voltage ranges compatible?

A: The MAX1608EEE+ operates from 2.7V ~ 5.5V. The NLVPCA9535EDTR2G operates from 1.65V ~ 5.5V, providing lower minimum voltage capability. Both devices are compatible with standard 3.3V and 5V logic supply rails. The substitute's extended lower voltage range offers additional design flexibility for low-power applications.

Q: Do both devices meet current environmental and compliance standards?

A: Yes. Both the MAX1608EEE+ and NLVPCA9535EDTR2G are ROHS3 compliant, REACH unaffected, and classified as MSL 1 (unlimited moisture sensitivity). Both carry EAR99 export classification and identical HTSUS codes, supporting equivalent supply chain and regulatory handling.

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