SP3243ECY-L RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SP3243ECY-L is a 3/5 full-duplex RS232 transceiver manufactured by MaxLinear, Inc., housed in a 28-TSSOP surface mount package. This interface IC is designed for applications requiring RS232 serial communication with dual supply voltage support (3V to 5.5V). The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing production and maintenance applications.

Key Parameters

Parameter	SP3243ECY-L
Manufacturer	MaxLinear, Inc.
Type	Transceiver
Protocol	RS232
Drivers/Receivers	3/5
Duplex	Full
Receiver Hysteresis	300 mV
Data Rate	120 Kbps
Supply Voltage	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package	28-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SP3243ECY-L is determined by the following critical parameters:

Primary Compatibility Criteria:

Protocol: RS232
Drivers/Receivers: 3/5 configuration
Duplex: Full
Supply Voltage: 3V ~ 5.5V
Package: 28-TSSOP or compatible surface mount package
Mounting Type: Surface Mount

Secondary Considerations:

Receiver Hysteresis: 300 mV or 500 mV (both acceptable for RS232 applications)
Data Rate: Minimum 120 Kbps (higher rates provide backward compatibility)
Operating Temperature: 0°C ~ 70°C or extended range (-40°C ~ 85°C)
RoHS Compliance: ROHS3 or equivalent environmental standard

Substitute parts are grouped into two categories: direct package equivalents (28-TSSOP) and alternative package options (28-SOIC, 28-SSOP) that maintain electrical compatibility while offering different form factors.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Hysteresis	Data Rate	Supply Voltage	Temp Range	Package	Status
SP3243ECY-L	MaxLinear	RS232	3/5	300 mV	120 Kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Discontinued
ICL3243ECVZ	Renesas	RS232	3/5	500 mV	250 Kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active
ICL3243ECVZ-T	Renesas	RS232	3/5	500 mV	250 Kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active
ICL3243EIVZ-T7A	Renesas	RS232	3/5	500 mV	250 Kbps	3V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	Active
MAX3243CDBR	Texas Instruments	RS232	3/5	300 mV	250 Kbps	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active
MAX3243CDW	Texas Instruments	RS232	3/5	300 mV	250 Kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Obsolete
MAX3243CDWR	Texas Instruments	RS232	3/5	300 mV	250 Kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active
MAX3243CPW	Texas Instruments	RS232	3/5	500 mV	250 Kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Obsolete
MAX3243CPWR	Texas Instruments	RS232	3/5	500 mV	250 Kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active
MAX3243CUI+T	Analog Devices Inc./Maxim	RS232	3/5	300 mV	120 Kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active
MAX3243ECDW	Texas Instruments	RS232	3/5	500 mV	500 Kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Last Time Buy

Engineering Selection Recommendations

Recommended Primary Substitutes (28-TSSOP Package - Direct Footprint Match):

ICL3243ECVZ-T and ICL3243ECVZ from Renesas Electronics are the preferred alternatives. Both maintain the 28-TSSOP package footprint, support the full 3V to 5.5V supply range, and provide enhanced data rate capability (250 Kbps vs. 120 Kbps). These parts carry Active product status with ROHS3 compliance and unlimited MSL rating, ensuring long-term availability and environmental compliance.

MAX3243CPWR from Texas Instruments is an active alternative in the 28-TSSOP package with 250 Kbps data rate capability and ROHS3 compliance. This part offers high inventory availability (45,100 units) and is suitable for new designs and production continuity.

MAX3243CUI+T from Analog Devices Inc./Maxim Integrated matches the original SP3243ECY-L data rate specification (120 Kbps) and receiver hysteresis (300 mV) while maintaining 28-TSSOP packaging and Active product status.

Extended Temperature Alternative:

ICL3243EIVZ-T7A from Renesas provides an extended operating temperature range (-40°C to 85°C) in the 28-TSSOP package, suitable for applications requiring wider thermal performance specifications.

Alternative Package Options (When PCB Redesign is Acceptable):

MAX3243CDBR (28-SSOP) and MAX3243CDWR (28-SOIC) from Texas Instruments provide Active product status with 250 Kbps data rate and ROHS3 compliance. These alternatives require PCB layout modification due to different package dimensions but offer established supply chains and high inventory levels.

Parts to Avoid:

MAX3243CDW and MAX3243CPW carry Obsolete or Last Time Buy status and should not be selected for new production applications despite current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can I use MAX3243CPWR as a direct replacement for SP3243ECY-L?

A: Yes. Both parts share the 28-TSSOP package footprint, support 3V to 5.5V supply voltage, and provide full-duplex RS232 communication with 3/5 driver/receiver configuration. MAX3243CPWR offers higher data rate capability (250 Kbps vs. 120 Kbps), which is backward compatible with the original specification. The 500 mV receiver hysteresis is within acceptable RS232 operating margins.

Q: What is the difference between ICL3243ECVZ and ICL3243ECVZ-T?

A: Both parts are electrically identical with 28-TSSOP packaging, 250 Kbps data rate, and 0°C to 70°C operating temperature. The primary difference is packaging format: ICL3243ECVZ is supplied in Tube packaging, while ICL3243ECVZ-T is supplied in Cut Tape (CT) & Digi-Reel format. Selection depends on assembly process requirements and inventory management preferences.

Q: Why does ICL3243EIVZ-T7A have a different temperature range?

A: ICL3243EIVZ-T7A is qualified for extended industrial temperature operation (-40°C to 85°C) compared to the commercial range (0°C to 70°C) of other alternatives. This part is suitable for applications requiring wider thermal performance but is not necessary for standard commercial temperature environments.

Q: Can I use 28-SOIC or 28-SSOP packages instead of 28-TSSOP?

A: Package substitution requires PCB redesign. The 28-SOIC package (0.295", 7.50mm width) and 28-SSOP package (0.209", 5.30mm width) have different pin spacing and footprints compared to the original 28-TSSOP (0.173", 4.40mm width). Electrical functionality remains compatible, but physical layout changes are mandatory.

Q: What does RoHS3 compliance mean for my application?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All recommended substitutes carry ROHS3 or equivalent RoHS compliance, ensuring environmental and regulatory compliance for both new and legacy applications.

Q: Is receiver hysteresis difference (300 mV vs. 500 mV) significant?

A: Both hysteresis values are within RS232 specification tolerances. The 300 mV specification provides tighter noise immunity margins, while 500 mV offers broader input signal acceptance. For most applications, both are functionally equivalent. Verify specific application requirements if operating in high-noise environments.

Q: Which substitute has the best long-term availability?

A: MAX3243CPWR from Texas Instruments shows the highest inventory level (45,100 units) with Active product status, indicating strong supply chain support. ICL3243ECVZ-T from Renesas (7,514 units) also provides robust availability with Active status. Both are suitable for long-term production commitments.

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