SP3243EUEY-L RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SP3243EUEY-L is a 3/5 full-duplex RS232 transceiver manufactured by MaxLinear, Inc., housed in a 28-TSSOP surface mount package. This interface IC operates across 3V to 5.5V supply voltage with a 1 Mbps data rate and 300 mV receiver hysteresis. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and system maintenance.

Key Parameters

Parameter	Value
Manufacturer Part Number	SP3243EUEY-L
Manufacturer	MaxLinear, Inc.
Product Category	Interface / RS232 Transceiver
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex Mode	Full
Package / Case	28-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Voltage - Supply	3V ~ 5.5V
Data Rate	1 Mbps
Receiver Hysteresis	300 mV
Operating Temperature	-40°C ~ 85°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the SP3243EUEY-L is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Protocol: RS232
Number of Drivers/Receivers: 3/5
Duplex Mode: Full
Package / Case: 28-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount
Voltage - Supply: 3V ~ 5.5V
Operating Temperature: -40°C ~ 85°C (preferred for extended range applications)

Allowable Variations:

Receiver Hysteresis: 300 mV (main part) to 500 mV (substitute parts) — acceptable within RS232 specification tolerances
Data Rate: 1 Mbps (main part) to 250 kbps (some substitutes) — lower data rates remain compatible for applications not requiring maximum throughput
Moisture Sensitivity Level: 1 (main part) to 3 (some substitutes) — both levels acceptable for standard PCB assembly processes
Product Status: Active substitutes preferred over obsolete main part for long-term availability

Substitute parts are grouped into two categories: Direct Equivalents (matching all critical parameters with active product status) and Manufacturer-Recommended Alternatives (meeting functional requirements with minor parameter variations).

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Package	Supply Voltage	Data Rate	Receiver Hysteresis	Operating Temp	Product Status	MSL
SP3243EUEY-L	MaxLinear, Inc.	RS232	3/5	28-TSSOP	3V ~ 5.5V	1 Mbps	300 mV	-40°C ~ 85°C	Obsolete	1
MAX3245EEUI+	Analog Devices Inc./Maxim Integrated	RS232	3/5	28-TSSOP	3V ~ 5.5V	1 Mbps	500 mV	-40°C ~ 85°C	Active	1
MAX3245EEUI+T	Analog Devices Inc./Maxim Integrated	RS232	3/5	28-TSSOP	3V ~ 5.5V	1 Mbps	500 mV	-40°C ~ 85°C	Active	1
SN65C3243PWR	Texas Instruments	RS232	3/5	28-TSSOP	3V ~ 5.5V	1 Mbps	500 mV	-40°C ~ 85°C	Active	1
TRSF3243IPWR	Texas Instruments	RS232	3/5	28-TSSOP	3V ~ 5.5V	1 Mbps	500 mV	-40°C ~ 85°C	Active	1
ICL3243ECVZ	Renesas Electronics Corporation	RS232	3/5	28-TSSOP	3V ~ 5.5V	250 kbps	500 mV	0°C ~ 70°C	Active	3
ICL3243ECVZ-T	Renesas Electronics Corporation	RS232	3/5	28-TSSOP	3V ~ 5.5V	250 kbps	500 mV	0°C ~ 70°C	Active	3
ICL3243EIVZ	Renesas Electronics Corporation	RS232	3/5	28-TSSOP	3V ~ 5.5V	250 kbps	500 mV	-40°C ~ 85°C	Active	3
ICL3243EIVZ-T	Renesas Electronics Corporation	RS232	3/5	28-TSSOP	3V ~ 5.5V	250 kbps	500 mV	-40°C ~ 85°C	Active	3
ICL3243EIVZ-T7A	Renesas Electronics Corporation	RS232	3/5	28-TSSOP	3V ~ 5.5V	250 kbps	500 mV	-40°C ~ 85°C	Active	3
MAX3243CDBR	Texas Instruments	RS232	3/5	28-SSOP	3V ~ 5.5V	250 kbps	300 mV	0°C ~ 70°C	Active	1

Engineering Selection Recommendations

Tier 1 — Direct Substitutes (Preferred for Pin-Compatible Replacement):

MAX3245EEUI+ and MAX3245EEUI+T (Analog Devices Inc./Maxim Integrated) are the primary direct substitutes. Both maintain 28-TSSOP packaging, 3V to 5.5V supply voltage, 1 Mbps data rate, and -40°C to 85°C operating temperature range. These parts are ROHS3 compliant and REACH unaffected, with active product status ensuring long-term availability. The 500 mV receiver hysteresis is within RS232 specification tolerance and does not affect functional compatibility.

SN65C3243PWR and TRSF3243IPWR (Texas Instruments) are equivalent alternatives meeting identical electrical and mechanical specifications. Both are ROHS3 compliant, REACH unaffected, and actively manufactured. These parts are available in Cut Tape and Digi-Reel packaging formats.

Tier 2 — Functional Substitutes (Extended Temperature Range):

ICL3243EIVZ, ICL3243EIVZ-T, and ICL3243EIVZ-T7A (Renesas Electronics Corporation) support the full -40°C to 85°C operating temperature range matching the original part. These parts are ROHS3 compliant and REACH unaffected. The 250 kbps data rate is lower than the original 1 Mbps specification but remains compatible for applications not requiring maximum throughput. MSL rating of 3 (168 Hours) is acceptable for standard PCB assembly processes.

Tier 3 — Functional Substitutes (Commercial Temperature Range):

ICL3243ECVZ and ICL3243ECVZ-T (Renesas Electronics Corporation) operate within 0°C to 70°C commercial temperature range. These parts are suitable for applications not requiring extended low-temperature operation. ROHS3 compliance and REACH unaffected status are maintained.

Package Consideration:

MAX3243CDBR (Texas Instruments) uses 28-SSOP packaging (0.209", 5.30mm Width) instead of 28-TSSOP (0.173", 4.40mm Width). This package difference requires PCB layout modification and is not recommended for direct pin-compatible replacement without design revision.

Frequently Asked Questions (FAQ)

Q: Can MAX3245EEUI+ directly replace SP3243EUEY-L without PCB modification?

A: Yes. Both parts use identical 28-TSSOP packaging with the same pinout, supply voltage range (3V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). The 500 mV receiver hysteresis of the MAX3245EEUI+ is within RS232 specification tolerance and does not affect functional compatibility.

Q: What is the difference between MAX3245EEUI+ and MAX3245EEUI+T?

A: Both parts are electrically identical. The "+T" suffix indicates tape and reel packaging format, while MAX3245EEUI+ is supplied in tube packaging. Selection depends on assembly process requirements and volume.

Q: Why do some substitutes have lower data rates (250 kbps vs. 1 Mbps)?

A: The ICL3243 series from Renesas operates at 250 kbps, which is lower than the original 1 Mbps specification. These parts remain functionally compatible for applications not requiring maximum data throughput. Verify application requirements before selection.

Q: Can ICL3243ECVZ be used in applications requiring -40°C operation?

A: No. ICL3243ECVZ operates within 0°C to 70°C range only. For extended low-temperature operation, select ICL3243EIVZ, ICL3243EIVZ-T, or ICL3243EIVZ-T7A, which support -40°C to 85°C.

Q: Is MAX3243CDBR a suitable replacement?

A: MAX3243CDBR uses 28-SSOP packaging instead of 28-TSSOP, requiring PCB layout modification. This part is not recommended for direct pin-compatible replacement without design revision.

Q: What does MSL rating mean for component selection?

A: Moisture Sensitivity Level (MSL) indicates storage and handling requirements. MSL 1 (Unlimited) allows indefinite storage at room temperature. MSL 3 (168 Hours) requires controlled humidity storage and has a 168-hour floor life after opening. Both ratings are acceptable for standard PCB assembly processes.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message