SP3243EBET-L RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SP3243EBET-L is a full-duplex RS232 transceiver IC manufactured by MaxLinear, Inc., designed for 3/5 driver/receiver configurations in 28-SOIC surface mount packaging. This component operates across 3V to 5.5V supply voltage with a 250kbps data rate and supports operating temperatures from -40°C to 85°C. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	SP3243EBET-L
Manufacturer	MaxLinear, Inc.
Product Category	Interface - RS232 Transceiver
Type	Transceiver
Protocol	RS232
Drivers/Receivers	3/5
Duplex Mode	Full
Data Rate	250kbps
Supply Voltage Range	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	28-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Receiver Hysteresis	300 mV
Moisture Sensitivity Level	3 (168 Hours)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the SP3243EBET-L is determined by strict alignment with the following critical parameters:

Primary Compatibility Criteria:

Protocol: RS232
Drivers/Receivers Configuration: 3/5
Duplex Mode: Full
Package Type: 28-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount
Supply Voltage Range: 3V ~ 5.5V (minimum overlap required)
Data Rate: 250kbps or higher
Operating Temperature Range: Must encompass or match -40°C ~ 85°C

Substitution Categories:

Direct Substitutes (Active Status): MAX3243EEWI+, MAX3243EEWI+T, MAX3244EEWI+, MAX3244EEWI+T, MAX3245EEWI+, MAX3245EEWI+T from Analog Devices Inc./Maxim Integrated. These parts maintain identical electrical specifications and package footprint with active product status and improved compliance ratings.

Manufacturer-Recommended Alternatives: ICL3243CBZ and ICL3243CBZ-T from Renesas Electronics Corporation. These parts meet core electrical and mechanical requirements with active status, though operating temperature range is limited to 0°C ~ 70°C.

Legacy Alternatives: MAX3243CDW and MAX3243CDWR from Texas Instruments. These parts provide functional equivalence but carry obsolete product status classification.

Parameter Comparison

Part Number	Manufacturer	Status	Drivers/Receivers	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	Package	MSL Rating
SP3243EBET-L	MaxLinear, Inc.	Obsolete	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	300 mV	28-SOIC	3 (168 Hours)
MAX3243EEWI+	Analog Devices Inc./Maxim Integrated	Active	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	500 mV	28-SOIC	1 (Unlimited)
MAX3243EEWI+T	Analog Devices Inc./Maxim Integrated	Active	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	500 mV	28-SOIC	1 (Unlimited)
MAX3244EEWI+	Analog Devices Inc./Maxim Integrated	Active	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	500 mV	28-SOIC	1 (Unlimited)
MAX3244EEWI+T	Analog Devices Inc./Maxim Integrated	Active	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	500 mV	28-SOIC	1 (Unlimited)
MAX3245EEWI+	Analog Devices Inc./Maxim Integrated	Active	3/5	1Mbps	3V ~ 5.5V	-40°C ~ 85°C	500 mV	28-SOIC	1 (Unlimited)
MAX3245EEWI+T	Analog Devices Inc./Maxim Integrated	Active	3/5	1Mbps	3V ~ 5.5V	-40°C ~ 85°C	500 mV	28-SOIC	1 (Unlimited)
ICL3243CBZ	Renesas Electronics Corporation	Active	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	300 mV	28-SOIC	3 (168 Hours)
ICL3243CBZ-T	Renesas Electronics Corporation	Active	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	300 mV	28-SOIC	3 (168 Hours)
MAX3243CDW	Texas Instruments	Obsolete	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	300 mV	28-SOIC	1 (Unlimited)
MAX3243CDWR	Texas Instruments	Active	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	300 mV	28-SOIC	1 (Unlimited)

Engineering Selection Recommendations

Preferred Substitutes (Highest Compatibility):

The MAX3243EEWI+T and MAX3244EEWI+T from Analog Devices Inc./Maxim Integrated are the primary recommended substitutes. Both parts maintain full electrical and mechanical compatibility with the SP3243EBET-L, including identical 28-SOIC packaging, 3V to 5.5V supply voltage range, and -40°C to 85°C operating temperature specification. These parts carry active product status with ROHS3 compliance and MSL rating of 1 (Unlimited), providing superior long-term availability and environmental compliance compared to the obsolete original part.

Extended Data Rate Alternative:

The MAX3245EEWI+T offers identical form factor and operating parameters with enhanced 1Mbps data rate capability, providing future-proofing for applications requiring higher communication speeds while maintaining backward compatibility with 250kbps operation.

Temperature-Limited Alternatives:

The ICL3243CBZ-T from Renesas Electronics Corporation provides an active-status alternative with matching receiver hysteresis (300 mV) and MSL rating. However, the operating temperature range is restricted to 0°C ~ 70°C, making this part suitable only for applications that do not require the full -40°C to 85°C temperature specification of the original part.

Legacy Compatibility:

The MAX3243CDWR from Texas Instruments maintains active status and provides functional equivalence, though it operates within the 0°C ~ 70°C temperature range and carries an obsolete base product classification.

Frequently Asked Questions (FAQ)

Q: Can MAX3245EEWI+T be used as a direct replacement for SP3243EBET-L?

A: Yes. The MAX3245EEWI+T maintains identical 3/5 driver/receiver configuration, full-duplex RS232 protocol, 28-SOIC package footprint, 3V to 5.5V supply voltage range, and -40°C to 85°C operating temperature. The 1Mbps data rate exceeds the 250kbps requirement, providing enhanced performance capability without functional compromise.

Q: What is the difference between MAX3243EEWI+ and MAX3243EEWI+T?

A: Both parts are electrically identical. The "+T" suffix indicates Tape & Reel packaging, while the non-suffixed version uses Tube packaging. Selection depends on assembly process requirements and volume considerations.

Q: Why is the operating temperature range important for substitution?

A: The SP3243EBET-L operates from -40°C to 85°C. Substitutes with narrower temperature ranges (such as 0°C to 70°C) are only suitable for applications that do not require the full extended temperature specification. Applications requiring -40°C operation must use substitutes that explicitly support this lower temperature limit.

Q: What does MSL rating mean for component selection?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to moisture before soldering. MSL 1 (Unlimited) parts like MAX3243EEWI+T have no time restrictions, while MSL 3 (168 Hours) parts like SP3243EBET-L must be soldered within 168 hours of moisture exposure. Higher MSL ratings provide greater handling flexibility in manufacturing environments.

Q: Are all substitute parts ROHS3 compliant?

A: All active-status substitute parts listed carry ROHS3 compliance certification. The original SP3243EBET-L does not specify ROHS status. ROHS3 compliance ensures the parts meet current environmental and hazardous substance restrictions for electronic components.

Q: Can ICL3243CBZ be used in applications requiring -40°C operation?

A: No. The ICL3243CBZ operates only from 0°C to 70°C and cannot be used in applications requiring the full -40°C to 85°C temperature range of the SP3243EBET-L. This part is suitable only for commercial temperature range applications.

Q: What is the significance of receiver hysteresis differences?

A: The SP3243EBET-L and ICL3243CBZ both specify 300 mV receiver hysteresis, while Analog Devices MAX32xx series parts specify 500 mV. Both values are within standard RS232 specifications and do not prevent functional substitution. The higher hysteresis value in MAX32xx parts provides improved noise immunity in electrically noisy environments.

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