SP312ECT-L RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SP312ECT-L is a 2/2 full-duplex RS232 transceiver manufactured by MaxLinear, Inc., housed in an 18-SOIC surface mount package. This interface IC is designed for serial communication applications requiring RS232 protocol compliance. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support, maintenance, and new design implementations where RS232 transceiver functionality is required.

Key Parameters

Parameter	SP312ECT-L
Manufacturer	MaxLinear, Inc.
Type	Transceiver
Protocol	RS232
Drivers/Receivers	2/2
Duplex	Full
Package / Case	18-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Data Rate	240kbps
Receiver Hysteresis	500 mV
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the SP312ECT-L is determined by strict alignment of the following critical parameters:

Protocol: RS232 full-duplex transceiver functionality
Configuration: 2/2 drivers and receivers
Package: 18-SOIC surface mount form factor
Supply Voltage: 4.5V to 5.5V compatibility
Electrical Performance: Data rate capability and receiver hysteresis specifications

Substitute parts are grouped into two categories based on operating temperature range and product status:

Category A - Active Status, Extended Temperature Range (-40°C to 85°C):

ADM242ARZ and ADM242ARZ-REEL (Analog Devices Inc.)
LTC1384ISW#PBF and LTC1384ISW#TRPBF (Analog Devices Inc.)
MAX242EWN+ (Analog Devices Inc./Maxim Integrated)

Category B - Active Status, Standard Temperature Range (0°C to 70°C):

LTC1384CSW#PBF and LTC1384CSW#TRPBF (Analog Devices Inc.)
MAX222CWN+T (Analog Devices Inc./Maxim Integrated)
MAX242CWN+ and MAX242CWN+T (Analog Devices Inc./Maxim Integrated)

All substitute parts maintain the 18-SOIC package footprint, 4.5V to 5.5V supply voltage range, and full-duplex 2/2 transceiver configuration required for direct functional replacement.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Package	Supply Voltage	Operating Temp	Data Rate	Receiver Hysteresis	Product Status	RoHS Status
SP312ECT-L	MaxLinear, Inc.	RS232	2/2	18-SOIC	4.5V ~ 5.5V	0°C ~ 70°C	240kbps	500 mV	Obsolete	—
ADM242ARZ	Analog Devices Inc.	RS232	2/2	18-SOIC	4.5V ~ 5.5V	-40°C ~ 85°C	200kbps	400 mV	Active	ROHS3 Compliant
ADM242ARZ-REEL	Analog Devices Inc.	RS232	2/2	18-SOIC	4.5V ~ 5.5V	-40°C ~ 85°C	200kbps	400 mV	Active	ROHS3 Compliant
LTC1384CSW#PBF	Analog Devices Inc.	RS232	2/2	18-SOIC	4.5V ~ 5V	0°C ~ 70°C	120KBd	400 mV	Active	ROHS3 Compliant
LTC1384CSW#TRPBF	Analog Devices Inc.	RS232	2/2	18-SOIC	4.5V ~ 5V	0°C ~ 70°C	120KBd	400 mV	Active	ROHS3 Compliant
LTC1384ISW#PBF	Analog Devices Inc.	RS232	2/2	18-SOIC	4.5V ~ 5V	-40°C ~ 85°C	120KBd	400 mV	Active	ROHS3 Compliant
LTC1384ISW#TRPBF	Analog Devices Inc.	RS232	2/2	18-SOIC	4.5V ~ 5V	-40°C ~ 85°C	120KBd	400 mV	Active	ROHS3 Compliant
MAX222CWN+T	Analog Devices Inc./Maxim Integrated	RS232	2/2	18-SOIC	4.5V ~ 5.5V	0°C ~ 70°C	250kbps	500 mV	Active	ROHS3 Compliant
MAX242CWN+	Analog Devices Inc./Maxim Integrated	RS232	2/2	18-SOIC	4.5V ~ 5.5V	0°C ~ 70°C	200kbps	500 mV	Active	ROHS3 Compliant
MAX242CWN+T	Analog Devices Inc./Maxim Integrated	RS232	2/2	18-SOIC	4.5V ~ 5.5V	0°C ~ 70°C	200kbps	500 mV	Active	ROHS3 Compliant
MAX242EWN+	Analog Devices Inc./Maxim Integrated	RS232	2/2	18-SOIC	4.5V ~ 5.5V	-40°C ~ 85°C	200kbps	500 mV	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Standard Temperature Applications (0°C to 70°C):

MAX222CWN+T and MAX242CWN+T are preferred substitutes. Both parts maintain the original SP312ECT-L operating temperature range, feature ROHS3 compliance, and are actively manufactured. MAX222CWN+T offers the highest data rate (250kbps) among standard-temperature options. MAX242CWN+T provides 200kbps performance with equivalent receiver hysteresis (500 mV) to the original part.

For Extended Temperature Applications (-40°C to 85°C):

ADM242ARZ, LTC1384ISW#PBF, LTC1384ISW#TRPBF, and MAX242EWN+ support the full industrial temperature range. ADM242ARZ and MAX242EWN+ maintain 500 mV receiver hysteresis matching the SP312ECT-L specification. LTC1384 variants operate at reduced data rates (120KBd) with 400 mV hysteresis but provide extended temperature capability.

Packaging Considerations:

ADM242ARZ-REEL and LTC1384ISW#TRPBF are supplied in tape and reel format for high-volume production. Tube packaging is available for ADM242ARZ, LTC1384ISW#PBF, MAX242CWN+, and MAX242EWN+. All substitute parts are ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the SP312ECT-L be directly replaced with any of these substitute parts?

A: Direct replacement requires matching the operating temperature range of your application. For 0°C to 70°C operation, MAX222CWN+T, MAX242CWN+, MAX242CWN+T, LTC1384CSW#PBF, and LTC1384CSW#TRPBF are suitable. For -40°C to 85°C operation, select ADM242ARZ, LTC1384ISW#PBF, LTC1384ISW#TRPBF, or MAX242EWN+. All maintain the 18-SOIC package footprint and RS232 2/2 transceiver configuration.

Q: What is the difference between ADM242ARZ and ADM242ARZ-REEL?

A: Both parts are electrically identical. ADM242ARZ is supplied in tube packaging for lower-volume applications, while ADM242ARZ-REEL is supplied in tape and reel format for automated assembly and higher-volume production runs.

Q: Why do some substitutes have lower data rates than the SP312ECT-L?

A: The LTC1384 series operates at 120KBd, which is lower than the SP312ECT-L's 240kbps specification. These parts remain functionally compatible for RS232 applications that do not require the higher data rate. Verify your application's actual data rate requirement before selection.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.

Q: What is the significance of receiver hysteresis differences?

A: The SP312ECT-L specifies 500 mV receiver hysteresis. MAX222CWN+T, MAX242CWN+, MAX242CWN+T, and MAX242EWN+ maintain this specification. ADM242ARZ and LTC1384 variants feature 400 mV hysteresis, which provides tighter input threshold margins. Both values are within standard RS232 operating parameters and are functionally compatible.

Q: Which substitute offers the best inventory availability?

A: ADM242ARZ-REEL has the highest inventory level at 21,246 pieces. MAX242EWN+ follows with 12,600 pieces. Both are actively manufactured and suitable for immediate procurement.

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