SP312ECT-L/TR RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SP312ECT-L/TR is a 2/2 full-duplex RS232 transceiver manufactured by MaxLinear, Inc., housed in an 18-SOIC 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 within a 4.5V to 5.5V supply range with a maximum data rate of 240 kbps and supports full RS232 protocol communication with 500 mV receiver hysteresis.

Key Parameters

Parameter	SP312ECT-L/TR
Manufacturer	MaxLinear, Inc.
Type	Transceiver
Protocol	RS232
Drivers/Receivers	2/2
Duplex	Full
Data Rate	240 kbps
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package	18-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Receiver Hysteresis	500 mV
Product Status	Obsolete
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the SP312ECT-L/TR is determined by the following critical parameters:

Protocol compatibility: RS232 full-duplex transceiver
Channel configuration: 2 drivers and 2 receivers
Package type: 18-SOIC surface mount form factor
Supply voltage range: 4.5V ~ 5.5V compatibility
Data rate capability: minimum 240 kbps support
Receiver hysteresis: 500 mV or greater

Substitute parts are grouped into two categories based on these criteria:

Category A - Direct Functional Equivalents (500 mV Hysteresis): MAX242 series parts (MAX242CWN+, MAX242CWN+T, MAX242EWN+, MAX242EWN+T) maintain identical receiver hysteresis and data rate specifications to the original part.

Category B - Compatible Alternatives (400 mV Hysteresis): ADM242ARZ series and LTC1384 series parts meet all core substitution parameters but operate with 400 mV receiver hysteresis and reduced data rates (200 kbps or 120 kbps). These parts are functionally compatible for RS232 communication applications within their specified operating ranges.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Voltage Supply	Operating Temp	Package	Receiver Hysteresis	Product Status	RoHS Status	MSL
SP312ECT-L/TR	MaxLinear, Inc.	RS232	2/2	240 kbps	4.5V ~ 5.5V	0°C ~ 70°C	18-SOIC	500 mV	Obsolete	—	3 (168 Hours)
ADM242ARZ	Analog Devices Inc.	RS232	2/2	200 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	18-SOIC	400 mV	Active	ROHS3 Compliant	1 (Unlimited)
ADM242ARZ-REEL	Analog Devices Inc.	RS232	2/2	200 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	18-SOIC	400 mV	Active	ROHS3 Compliant	1 (Unlimited)
LTC1384CSW#PBF	Analog Devices Inc.	RS232	2/2	120 kbps	4.5V ~ 5V	0°C ~ 70°C	18-SO	400 mV	Active	ROHS3 Compliant	1 (Unlimited)
LTC1384CSW#TRPBF	Analog Devices Inc.	RS232	2/2	120 kbps	4.5V ~ 5V	0°C ~ 70°C	18-SO	400 mV	Active	ROHS3 Compliant	1 (Unlimited)
LTC1384ISW#PBF	Analog Devices Inc.	RS232	2/2	120 kbps	4.5V ~ 5V	-40°C ~ 85°C	18-SO	400 mV	Active	ROHS3 Compliant	1 (Unlimited)
LTC1384ISW#TRPBF	Analog Devices Inc.	RS232	2/2	120 kbps	4.5V ~ 5V	-40°C ~ 85°C	18-SO	400 mV	Active	ROHS3 Compliant	1 (Unlimited)
MAX242CWN+	Analog Devices Inc./Maxim Integrated	RS232	2/2	200 kbps	4.5V ~ 5.5V	0°C ~ 70°C	18-SOIC	500 mV	Active	ROHS3 Compliant	1 (Unlimited)
MAX242CWN+T	Analog Devices Inc./Maxim Integrated	RS232	2/2	200 kbps	4.5V ~ 5.5V	0°C ~ 70°C	18-SOIC	500 mV	Active	ROHS3 Compliant	1 (Unlimited)
MAX242EWN+	Analog Devices Inc./Maxim Integrated	RS232	2/2	200 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	18-SOIC	500 mV	Active	ROHS3 Compliant	1 (Unlimited)
MAX242EWN+T	Analog Devices Inc./Maxim Integrated	RS232	2/2	200 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	18-SOIC	500 mV	Active	ROHS3 Compliant	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Preferred): The MAX242 series (MAX242CWN+, MAX242CWN+T, MAX242EWN+, MAX242EWN+T) provides the closest functional equivalence to the SP312ECT-L/TR. These parts maintain 500 mV receiver hysteresis, identical 18-SOIC packaging, and full RS232 2/2 transceiver configuration. All MAX242 variants are active products with ROHS3 compliance and unlimited moisture sensitivity rating, eliminating obsolescence risk. Selection between variants depends on operating temperature requirements and packaging format (tube or tape & reel).

For Extended Temperature Range Applications: MAX242EWN+ and MAX242EWN+T support -40°C to 85°C operation, exceeding the original part's 0°C to 70°C range. These are suitable for industrial and automotive environments requiring broader temperature tolerance.

For Cost-Optimized Alternatives: ADM242ARZ and ADM242ARZ-REEL from Analog Devices provide active product status with extended temperature range (-40°C to 85°C) and superior moisture sensitivity (MSL 1 vs. MSL 3). The 400 mV receiver hysteresis and 200 kbps data rate remain within RS232 specification compliance for standard communication applications.

For Legacy System Compatibility: LTC1384 series parts (CSW and ISW variants) maintain full RS232 2/2 transceiver functionality with 18-SO packaging compatibility. The 120 kbps data rate is suitable for low-speed RS232 applications. Temperature-rated variants (ISW) support -40°C to 85°C operation for extended environmental conditions.

All substitute parts carry ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can MAX242 series parts directly replace the SP312ECT-L/TR without circuit modifications?

A: Yes. MAX242 variants maintain identical receiver hysteresis (500 mV), supply voltage range (4.5V ~ 5.5V), 2/2 transceiver configuration, and 18-SOIC package footprint. No circuit modifications are required for functional substitution.

Q: What is the impact of reduced receiver hysteresis in ADM242ARZ and LTC1384 parts?

A: Receiver hysteresis of 400 mV versus 500 mV affects noise immunity during signal transitions. The 400 mV specification remains within RS232 standard compliance (±200 mV minimum). Applications with marginal signal quality or high-noise environments may benefit from the higher 500 mV hysteresis of MAX242 parts.

Q: Are LTC1384 parts suitable for applications requiring 240 kbps data rates?

A: LTC1384 parts are rated for 120 kbps maximum data rate, which is below the original SP312ECT-L/TR specification of 240 kbps. These parts are suitable for applications operating at 120 kbps or lower. For applications requiring 240 kbps operation, MAX242 series (200 kbps) or ADM242ARZ (200 kbps) are more appropriate, though they operate below the original specification.

Q: What packaging options are available for substitute parts?

A: MAX242 and ADM242 parts are available in 18-SOIC packages matching the original footprint. Packaging formats include tube (standard) and tape & reel (TR) for automated assembly. LTC1384 parts use 18-SO packaging, which is mechanically compatible with 18-SOIC footprints but may require PCB layout verification.

Q: Do substitute parts meet current regulatory compliance standards?

A: All active substitute parts (MAX242, ADM242, LTC1384 series) are ROHS3 compliant and REACH unaffected. These certifications exceed the original obsolete part's regulatory status, making them suitable for new designs and long-term product support.

Q: Which substitute part offers the best long-term availability?

A: MAX242EWN+ and MAX242EWN+T are recommended for long-term availability due to active product status, extended temperature range (-40°C to 85°C), and high inventory levels (12,600 and 3,000 units respectively). ADM242ARZ-REEL also offers excellent availability with 21,246 units in stock.

Q: Can I use LTC1384ISW#TRPBF for applications requiring -40°C to 85°C operation?

A: Yes. LTC1384ISW#TRPBF is rated for -40°C to 85°C operation and is available in tape & reel packaging. However, the 120 kbps data rate limitation must be considered for your specific application requirements.

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