SP3243EUCA-L RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SP3243EUCA-L is a full-duplex RS232 transceiver manufactured by MaxLinear, Inc., featuring 3 drivers and 5 receivers in a 28-SSOP surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The part operates across 3V to 5.5V supply voltage with a 1Mbps data rate and 300 mV receiver hysteresis, suitable for industrial and commercial RS232 communication applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	SP3243EUCA-L
Manufacturer	MaxLinear, Inc.
Product Category	Interface / RS232 Transceiver
Type	Transceiver
Protocol	RS232
Drivers / Receivers	3/5
Duplex Mode	Full
Data Rate	1 Mbps
Supply Voltage Range	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	28-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Receiver Hysteresis	300 mV
Moisture Sensitivity Level (MSL)	2 (1 Year)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the SP3243EUCA-L is determined by strict adherence to the following critical parameters:

Primary Substitution Criteria:

Protocol: RS232 (mandatory match)
Drivers / Receivers: 3/5 configuration (mandatory match)
Duplex Mode: Full (mandatory match)
Package / Case: 28-SSOP with 0.209" width, 5.30mm (mandatory match)
Supply Voltage Range: 3V ~ 5.5V (mandatory match)
Operating Temperature: 0°C ~ 70°C (mandatory match)
Mounting Type: Surface Mount (mandatory match)

Secondary Compatibility Parameters:

Data Rate: 1 Mbps or higher (backward compatible)
Receiver Hysteresis: 300 mV or higher (acceptable variation)

All substitute parts listed meet these mandatory criteria. Variations in receiver hysteresis (500 mV vs. 300 mV) and data rate (250 kbps vs. 1 Mbps) are noted but do not disqualify substitution when other parameters align.

Parameter Comparison

Part Number	Manufacturer	Drivers/Receivers	Data Rate	Receiver Hysteresis	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
SP3243EUCA-L	MaxLinear, Inc.	3/5	1 Mbps	300 mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Obsolete	N/A
ICL3245CAZ	Renesas Electronics	3/5	1 Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
ICL3245CAZ-T	Renesas Electronics	3/5	1 Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
ICL3245ECAZ	Renesas Electronics	3/5	1 Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
ICL3245ECAZ-T	Renesas Electronics	3/5	1 Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
MAX3243ECAI+	Analog Devices Inc./Maxim Integrated	3/5	250 kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
MAX3243ECAI+T	Analog Devices Inc./Maxim Integrated	3/5	250 kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
MAX3244ECAI+	Analog Devices Inc./Maxim Integrated	3/5	250 kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
MAX3244ECAI+T	Analog Devices Inc./Maxim Integrated	3/5	250 kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
MAX3245ECAI+	Analog Devices Inc./Maxim Integrated	3/5	1 Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
MAX3245ECAI+T	Analog Devices Inc./Maxim Integrated	3/5	1 Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The ICL3245 series (ICL3245CAZ, ICL3245CAZ-T, ICL3245ECAZ, ICL3245ECAZ-T) from Renesas Electronics and the MAX3245ECAI+ series from Analog Devices Inc./Maxim Integrated represent the closest functional equivalents. These parts maintain the 1 Mbps data rate specification of the original SP3243EUCA-L and are in active production status with ROHS3 compliance certification. The receiver hysteresis increase from 300 mV to 500 mV provides enhanced noise immunity without compromising system functionality.

Secondary Substitutes (Reduced Data Rate):

The MAX3243 and MAX3244 series (MAX3243ECAI+, MAX3243ECAI+T, MAX3244ECAI+, MAX3244ECAI+T) operate at 250 kbps data rate, which is lower than the original 1 Mbps specification. These parts are suitable for applications where the reduced data rate does not impact system requirements. All are in active production with ROHS3 compliance.

Packaging Considerations:

Tube packaging (CAZ, ECAI+) and Tape & Reel packaging (CAZ-T, ECAZ-T, ECAI+T) variants are available across all substitute families. Selection depends on procurement volume and assembly process requirements. Tape & Reel packaging is standard for high-volume automated assembly operations.

Compliance Status:

All substitute parts listed carry ROHS3 compliance certification and REACH Unaffected status, meeting modern environmental and regulatory requirements. The original SP3243EUCA-L, being obsolete, lacks these certifications.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SP3243EUCA-L with any of the listed substitutes?

A: Yes, all listed parts meet the mandatory substitution criteria: RS232 protocol, 3/5 driver/receiver configuration, full-duplex operation, 28-SSOP package, 3V to 5.5V supply voltage, and 0°C to 70°C operating temperature range. Physical and electrical compatibility is confirmed across all substitutes.

Q: What is the difference between ICL3245 and MAX3245 series?

A: Both series maintain 1 Mbps data rate and identical electrical specifications. The primary differences are manufacturer (Renesas vs. Analog Devices) and moisture sensitivity level (MSL 2 for ICL3245 vs. MSL 1 for MAX3245). The MAX3245 series offers unlimited shelf life under controlled conditions, while ICL3245 is rated for 1 year.

Q: Why do some substitutes have lower data rates (250 kbps)?

A: The MAX3243 and MAX3244 series operate at 250 kbps instead of 1 Mbps. These parts are functionally compatible but suitable only for applications where the reduced data rate does not impact communication requirements. For systems requiring 1 Mbps operation, select ICL3245 or MAX3245 series.

Q: What is the significance of receiver hysteresis differences?

A: The original SP3243EUCA-L specifies 300 mV receiver hysteresis, while all substitutes provide 500 mV. Higher hysteresis improves noise immunity and signal integrity in noisy environments. This is a beneficial characteristic change and does not create compatibility issues.

Q: Should I choose Tube or Tape & Reel packaging?

A: Tube packaging is suitable for low-volume applications and manual assembly. Tape & Reel packaging is standard for high-volume automated pick-and-place assembly. Both packaging formats contain identical components; selection depends on production volume and assembly methodology.

Q: Are all substitutes ROHS3 compliant?

A: Yes, all listed substitute parts carry ROHS3 compliance certification. The original SP3243EUCA-L does not have this certification due to its obsolete status. For new designs or systems requiring environmental compliance documentation, substitute parts provide certified compliance.

Q: Can I mix different substitute part numbers in the same design?

A: All listed substitutes are electrically and mechanically compatible with each other and with the original SP3243EUCA-L. However, for consistency in procurement, testing, and documentation, using a single part number across a design is recommended.

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