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MAX3243ECAI RS232 Transceiver Equivalent & Substitute Parts
Part Overview
The MAX3243ECAI is a full-duplex RS232 transceiver IC manufactured by Analog Devices Inc./Maxim Integrated, configured with 3 drivers and 5 receivers in a 28-SSOP surface mount package. This device operates across a 3V to 5.5V supply range with a 250 kbps data rate and is designed for industrial and commercial serial communication applications.
The MAX3243ECAI is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for legacy systems and new designs requiring compatible RS232 transceiver functionality.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | MAX3243ECAI |
| Manufacturer | Analog Devices Inc./Maxim Integrated |
| Type | Transceiver |
| Protocol | RS232 |
| Number of Drivers/Receivers | 3/5 |
| Duplex | Full |
| Data Rate | 250 kbps |
| Voltage - Supply | 3V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C |
| Receiver Hysteresis | 500 mV |
| Mounting Type | Surface Mount |
| Package / Case | 28-SSOP (0.209", 5.30mm Width) |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the MAX3243ECAI are grouped based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:
Critical Parameters for Substitution:
- Protocol: RS232
- Duplex: Full
- Data Rate: 250 kbps
- Voltage Supply Range: 3V ~ 5.5V
- Package / Case: 28-SSOP (0.209", 5.30mm Width)
- Mounting Type: Surface Mount
- Number of Drivers/Receivers: 3/5 (primary configuration)
Substitution Categories:
Parametric Equivalents – Parts with identical electrical specifications and driver/receiver configuration (3/5), manufactured by Analog Devices Inc./Maxim Integrated. These include MAX3241ECAI+, MAX3243ECAI+, MAX3244CAI+, and MAX3244ECAI+. These parts maintain full functional compatibility with the original design.
Reduced Configuration Equivalent – MAX3250CAI+ operates with a 2/2 driver/receiver configuration instead of 3/5. This part is suitable only for applications requiring fewer communication channels.
Direct Manufacturer Alternatives – SP3243EBCA-L/TR, manufactured by MaxLinear, Inc., provides equivalent 3/5 transceiver functionality with identical package and electrical specifications. Receiver hysteresis differs at 300 mV versus 500 mV on the original part.
Extended Temperature Range Upgrades – MAX3243IDB, MAX3243IDBR, SP3243EBEA-L/TR, and TRS3243IDB extend the operating temperature range to -40°C ~ 85°C, supporting industrial and automotive applications beyond the original 0°C ~ 70°C specification.
Parameter Comparison
| Part Number | Manufacturer | Drivers/Receivers | Data Rate | Supply Voltage | Operating Temp | Receiver Hysteresis | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| MAX3243ECAI | Analog Devices Inc./Maxim Integrated | 3/5 | 250 kbps | 3V ~ 5.5V | 0°C ~ 70°C | 500 mV | 28-SSOP | Obsolete | RoHS non-compliant |
| MAX3241ECAI+ | Analog Devices Inc./Maxim Integrated | 3/5 | 250 kbps | 3V ~ 5.5V | 0°C ~ 70°C | 500 mV | 28-SSOP | Active | ROHS3 Compliant |
| MAX3243ECAI+ | Analog Devices Inc./Maxim Integrated | 3/5 | 250 kbps | 3V ~ 5.5V | 0°C ~ 70°C | 500 mV | 28-SSOP | Active | ROHS3 Compliant |
| MAX3244CAI+ | Analog Devices Inc./Maxim Integrated | 3/5 | 250 kbps | 3V ~ 5.5V | 0°C ~ 70°C | 500 mV | 28-SSOP | Active | ROHS3 Compliant |
| MAX3244ECAI+ | Analog Devices Inc./Maxim Integrated | 3/5 | 250 kbps | 3V ~ 5.5V | 0°C ~ 70°C | 500 mV | 28-SSOP | Active | ROHS3 Compliant |
| MAX3250CAI+ | Analog Devices Inc./Maxim Integrated | 2/2 | 250 kbps | 3V ~ 5.5V | 0°C ~ 70°C | 500 mV | 28-SSOP | Active | ROHS3 Compliant |
| SP3243EBCA-L/TR | MaxLinear, Inc. | 3/5 | 250 kbps | 3V ~ 5.5V | 0°C ~ 70°C | 300 mV | 28-SSOP | Active | RoHS Compliant |
| MAX3243IDB | Texas Instruments | 3/5 | 250 kbps | 3V ~ 5.5V | -40°C ~ 85°C | 500 mV | 28-SSOP | Obsolete | ROHS3 Compliant |
| MAX3243IDBR | Texas Instruments | 3/5 | 250 kbps | 3V ~ 5.5V | -40°C ~ 85°C | 500 mV | 28-SSOP | Active | ROHS3 Compliant |
| SP3243EBEA-L/TR | MaxLinear, Inc. | 3/5 | 250 kbps | 3V ~ 5.5V | -40°C ~ 85°C | 300 mV | 28-SSOP | Active | RoHS Compliant |
| TRS3243IDB | Texas Instruments | 3/5 | 250 kbps | 3V ~ 5.5V | -40°C ~ 85°C | 500 mV | 28-SSOP | Obsolete | ROHS3 Compliant |
Engineering Selection Recommendations
For Direct Replacement (Commercial Temperature Range):
MAX3243ECAI+ and MAX3244ECAI+ are the primary recommended substitutes. Both are manufactured by Analog Devices Inc./Maxim Integrated, maintain identical electrical specifications and driver/receiver configuration, and are in active product status with ROHS3 compliance. These parts provide drop-in compatibility for the obsolete MAX3243ECAI.
For RoHS Compliance Requirement:
All substitute parts listed except the original MAX3243ECAI meet RoHS compliance standards. MAX3243ECAI+, MAX3244ECAI+, MAX3241ECAI+, and MAX3244CAI+ are ROHS3 compliant. SP3243EBCA-L/TR and SP3243EBEA-L/TR are RoHS compliant alternatives from MaxLinear, Inc.
For Extended Industrial Temperature Range (-40°C ~ 85°C):
MAX3243IDBR (Texas Instruments, active status) is the recommended upgrade option. SP3243EBEA-L/TR (MaxLinear, Inc., active status) provides equivalent functionality with extended temperature capability. Both maintain 3/5 driver/receiver configuration and 250 kbps data rate.
For Reduced Channel Configuration:
MAX3250CAI+ operates with 2/2 drivers/receivers instead of 3/5. This part is suitable only for applications that do not require the full 3/5 channel configuration of the original design.
Packaging Considerations:
All substitute parts use the 28-SSOP package with identical 0.209" width and 5.30mm dimensions. Packaging variants (Tube, Tape & Reel, Cut Tape) do not affect electrical compatibility but may influence procurement and handling procedures.
Frequently Asked Questions (FAQ)
Q: Can MAX3243ECAI+ directly replace MAX3243ECAI in existing designs?
A: Yes. MAX3243ECAI+ maintains identical electrical specifications, driver/receiver configuration (3/5), data rate (250 kbps), supply voltage range (3V ~ 5.5V), and 28-SSOP package. The primary difference is active product status and ROHS3 compliance versus the obsolete, non-compliant original part.
Q: What is the difference between receiver hysteresis values of 500 mV and 300 mV?
A: Receiver hysteresis determines the voltage difference between logic high and low thresholds. The 300 mV hysteresis in SP3243EBCA-L/TR and SP3243EBEA-L/TR provides tighter input threshold margins compared to the 500 mV specification of the original MAX3243ECAI. Both values are within RS232 standard specifications and support 250 kbps data rates.
Q: Is MAX3250CAI+ a suitable substitute for MAX3243ECAI?
A: MAX3250CAI+ is not a direct substitute. It operates with 2/2 drivers/receivers instead of 3/5. Use this part only if your application requires fewer communication channels and can accommodate the reduced driver/receiver count.
Q: Which substitute part is recommended for automotive or industrial applications requiring extended temperature operation?
A: MAX3243IDBR (Texas Instruments, active status) or SP3243EBEA-L/TR (MaxLinear, Inc., active status) are recommended for extended temperature range applications. Both support -40°C ~ 85°C operating temperature versus the original 0°C ~ 70°C specification.
Q: Are all substitute parts RoHS compliant?
A: All substitute parts listed meet RoHS compliance standards. MAX3243ECAI+, MAX3244ECAI+, MAX3241ECAI+, and MAX3244CAI+ are ROHS3 compliant. SP3243EBCA-L/TR and SP3243EBEA-L/TR are RoHS compliant. The original MAX3243ECAI is RoHS non-compliant.
Q: Does packaging type (Tube, Tape & Reel, Cut Tape) affect electrical compatibility?
A: No. Packaging type affects procurement, storage, and handling procedures but does not impact electrical performance or functional compatibility. All substitute parts in the 28-SSOP package are mechanically and electrically interchangeable regardless of packaging format.
Q: What is the difference between MAX3243IDB and MAX3243IDBR?
A: Both are Texas Instruments variants of the MAX3243 with extended temperature range (-40°C ~ 85°C). MAX3243IDB is obsolete and supplied in Tube packaging. MAX3243IDBR is active and supplied in Cut Tape (CT) & Digi-Reel® packaging, making it the preferred option for new designs and ongoing supply.
Q: Can I use SP3243EBCA-L/TR as a direct replacement for MAX3243ECAI?
A: Yes, with consideration of receiver hysteresis. SP3243EBCA-L/TR maintains identical 3/5 driver/receiver configuration, 250 kbps data rate, 3V ~ 5.5V supply range, and 28-SSOP package. The 300 mV receiver hysteresis differs from the original 500 mV specification but remains within RS232 standards and supports equivalent data rates.
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