MAX3140CEI Equivalent & Substitute Parts

Part Overview

The MAX3140CEI is an RS232/RS485 controller IC with integrated SPI and UART interfaces, housed in a 28-QSOP package. This component functions as a micropower interface controller designed for serial communication applications requiring dual protocol support. The MAX3140CEI is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain identical electrical specifications, protocol support, and package compatibility to ensure direct replacement capability.

Substiute Parts

MAX3140CEI

Analog Devices Inc./Maxim IntegratedIn Stock: 52878MAX3140CEI Datasheet

Current PartRFQ

MAX3140CEI+

Analog Devices Inc./Maxim IntegratedIn Stock: 1519MAX3140CEI+ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX3140CEI is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Requirements:

• Voltage supply range: 4.75V ~ 5.25V (exact match required)
• Supply current: 640µA (exact match required)
• Operating temperature range: 0°C ~ 70°C (exact match required)

Functional Compatibility Requirements:

• Protocol support: RS232 and RS485 (both protocols must be present)
• Interface types: SPI and UART (both interfaces must be present)
• Function classification: Controller

Physical Compatibility Requirements:

• Package type: 28-SSOP (0.154", 3.90mm Width)
• Supplier device package: 28-QSOP (pin-compatible footprint)

Regulatory & Compliance Considerations:

• RoHS compliance status
• REACH compliance status
• Moisture sensitivity level

The MAX3140CEI+ qualifies as a direct substitute based on complete alignment with all electrical, functional, and physical parameters specified above.

Parameter Comparison

Engineering Selection Recommendations

The MAX3140CEI+ is the direct functional equivalent of the MAX3140CEI. Selection of the MAX3140CEI+ is supported by the following engineering factors:

Product Status Consideration: The MAX3140CEI is classified as obsolete, while the MAX3140CEI+ maintains active product status. This distinction ensures continued availability and manufacturer support for the substitute part.

Regulatory Compliance Advantage: The MAX3140CEI+ achieves ROHS3 compliance, whereas the original MAX3140CEI is RoHS non-compliant. This improvement aligns with current environmental and regulatory requirements for electronic components in most markets.

Electrical and Functional Equivalence: All critical electrical parameters, protocol support, interface types, and package specifications are identical between the two parts. Pin-for-pin compatibility is maintained through identical 28-QSOP packaging.

Moisture Sensitivity Parity: Both parts share identical MSL ratings, ensuring equivalent handling and storage requirements.

For applications currently using the MAX3140CEI, direct substitution with the MAX3140CEI+ is supported without circuit modification or redesign.

Frequently Asked Questions (FAQ)

Q: Can the MAX3140CEI+ be used as a direct replacement for the MAX3140CEI in existing designs?

A: Yes. The MAX3140CEI+ is electrically and functionally identical to the MAX3140CEI across all specified parameters. Pin-for-pin compatibility is maintained through identical 28-QSOP packaging. No circuit modifications are required.

Q: What is the primary reason for substituting the MAX3140CEI?

A: The MAX3140CEI is classified as obsolete. The MAX3140CEI+ provides functional equivalence with active product status, ensuring continued availability and manufacturer support.

Q: Are the voltage supply requirements identical between the two parts?

A: Yes. Both the MAX3140CEI and MAX3140CEI+ operate within the same voltage supply range of 4.75V ~ 5.25V and draw identical supply current of 640µA.

Q: Do both parts support the same communication protocols?

A: Yes. Both parts provide identical support for RS232 and RS485 protocols, with SPI and UART interface capabilities.

Q: What is the difference in RoHS compliance between these parts?

A: The MAX3140CEI is RoHS non-compliant, while the MAX3140CEI+ achieves ROHS3 compliance. This represents an improvement in environmental compliance for the substitute part.

Q: Are the package dimensions and pin configurations identical?

A: Yes. Both parts use the 28-SSOP package (0.154", 3.90mm Width) with 28-QSOP supplier device packaging. Pin-for-pin compatibility is maintained.

Q: What are the operating temperature specifications for both parts?

A: Both the MAX3140CEI and MAX3140CEI+ operate across the identical temperature range of 0°C ~ 70°C.

Q: Is the moisture sensitivity level the same for both parts?

A: Yes. Both parts share an MSL rating of 1 (Unlimited), indicating identical handling and storage requirements.