ICL3243ECB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The ICL3243ECB is a 3/5 transceiver full-duplex RS232 interface IC manufactured by Renesas Electronics Corporation in 28-SOIC surface mount packaging. This component operates across 3V to 5.5V supply voltage with a 250kbps data rate and 500mV receiver hysteresis. The ICL3243ECB is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. Direct substitutes maintain identical electrical and mechanical specifications, while upgrade options provide extended operating temperature ranges or improved product status.

Key Parameters

Parameter	Value
Part Number	ICL3243ECB
Manufacturer	Renesas Electronics Corporation
Type	Transceiver
Protocol	RS232
Drivers/Receivers	3/5
Duplex	Full
Package	28-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Voltage Supply	3V ~ 5.5V
Data Rate	250kbps
Receiver Hysteresis	500mV
Operating Temperature	0°C ~ 70°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the ICL3243ECB is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Protocol: RS232
Drivers/Receivers Configuration: 3/5
Duplex Mode: Full
Package Type: 28-SOIC (0.295", 7.50mm Width)
Voltage Supply Range: 3V ~ 5.5V
Receiver Hysteresis: 500mV
Operating Temperature: 0°C ~ 70°C (for direct substitutes)

Substitution Categories:

Direct Substitutes maintain all electrical specifications including 250kbps data rate, 500mV receiver hysteresis, and 0°C to 70°C operating temperature. These parts are pin-compatible and functionally equivalent without design modification.

Upgrade Options provide extended operating temperature range (-40°C to 85°C) while maintaining all other electrical parameters. These parts are suitable for applications requiring wider temperature operation.

Similar Parts share the same package, protocol, and driver/receiver configuration but differ in receiver hysteresis (300mV) and data rate (250kbps). These require application-level verification before substitution.

Parameter Comparison

Part Number	Manufacturer	Data Rate	Receiver Hysteresis	Operating Temperature	Product Status	RoHS Status	Packaging
ICL3243ECB	Renesas Electronics	250kbps	500mV	0°C ~ 70°C	Obsolete	Non-compliant	Tube
MAX3243ECDW	Texas Instruments	500kbps	500mV	0°C ~ 70°C	Last Time Buy	ROHS3 Compliant	Tube
MAX3243ECDWR	Texas Instruments	500kbps	500mV	0°C ~ 70°C	Active	ROHS3 Compliant	Tape & Reel
TRS3243ECDW	Texas Instruments	500kbps	500mV	0°C ~ 70°C	Last Time Buy	ROHS3 Compliant	Tube
TRS3243ECDWR	Texas Instruments	500kbps	500mV	0°C ~ 70°C	Active	ROHS3 Compliant	Tape & Reel
MAX3243EIDW	Texas Instruments	500kbps	500mV	-40°C ~ 85°C	Last Time Buy	ROHS3 Compliant	Tube
MAX3243EIDWR	Texas Instruments	500kbps	500mV	-40°C ~ 85°C	Active	ROHS3 Compliant	Tape & Reel
TRS3243EIDW	Texas Instruments	500kbps	500mV	-40°C ~ 85°C	Last Time Buy	ROHS3 Compliant	Tube
TRS3243EIDWR	Texas Instruments	500kbps	500mV	-40°C ~ 85°C	Active	ROHS3 Compliant	Tape & Reel
MAX3243CDW	Texas Instruments	250kbps	300mV	0°C ~ 70°C	Obsolete	ROHS3 Compliant	Tube
MAX3243CDWR	Texas Instruments	250kbps	300mV	0°C ~ 70°C	Active	ROHS3 Compliant	Tape & Reel

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select MAX3243ECDWR or TRS3243ECDWR for active product status with ROHS3 compliance. Both parts maintain 500mV receiver hysteresis, 0°C to 70°C operating temperature, and 28-SOIC packaging. The Tape & Reel packaging format (ECDWR variants) is preferred for high-volume production environments. MAX3243ECDW and TRS3243ECDW provide equivalent electrical performance in Tube packaging but carry Last Time Buy status.

For Extended Temperature Operation: Select MAX3243EIDWR or TRS3243EIDWR when applications require -40°C to 85°C operating range. These upgrade options maintain all other electrical parameters while providing wider temperature coverage. Active product status ensures long-term availability. Tape & Reel packaging supports automated assembly processes.

For Legacy System Support: MAX3243CDW and MAX3243CDWR are suitable only when the application can tolerate 300mV receiver hysteresis instead of 500mV. These parts match the original 250kbps data rate and 0°C to 70°C temperature range. MAX3243CDWR provides active status with ROHS3 compliance.

Compliance Considerations: All Texas Instruments substitute parts are ROHS3 compliant, addressing environmental regulatory requirements absent in the original Renesas ICL3243ECB. This compliance upgrade is beneficial for new designs and systems subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can MAX3243ECDWR directly replace ICL3243ECB without circuit modification? A: Yes. MAX3243ECDWR maintains identical electrical specifications: 3V to 5.5V supply, 500mV receiver hysteresis, 0°C to 70°C operating temperature, and 28-SOIC package. Pin configuration and functional behavior are equivalent. No circuit redesign is required.

Q: What is the difference between MAX3243ECDWR and MAX3243EIDWR? A: Both parts share identical electrical specifications except operating temperature range. MAX3243ECDWR operates 0°C to 70°C; MAX3243EIDWR operates -40°C to 85°C. Select the extended-temperature variant (EIDWR) only if your application requires operation below 0°C or above 70°C.

Q: Why do some substitute parts have higher data rates (500kbps vs 250kbps)? A: The substitute parts support higher data rates while remaining backward-compatible. Applications using 250kbps operation will function correctly with 500kbps-capable parts. The higher capability does not affect performance at lower speeds.

Q: What is the significance of packaging format (Tube vs Tape & Reel)? A: Tube packaging is suitable for manual assembly and low-volume applications. Tape & Reel packaging is optimized for automated pick-and-place assembly in high-volume production. Both formats contain identical components; selection depends on manufacturing process requirements.

Q: Are all substitute parts ROHS3 compliant? A: All Texas Instruments substitute parts listed are ROHS3 compliant. The original ICL3243ECB is RoHS non-compliant. Substitution provides compliance upgrade for systems subject to RoHS regulations.

Q: Can MAX3243CDW substitute for ICL3243ECB? A: MAX3243CDW shares package and protocol but differs in receiver hysteresis (300mV vs 500mV). This parameter difference may affect signal integrity in applications with marginal noise margins. Application-level testing is necessary before substitution.

Q: What inventory status should I prioritize for new designs? A: Select parts with Active product status for new designs: MAX3243ECDWR, TRS3243ECDWR, MAX3243EIDWR, TRS3243EIDWR, or MAX3243CDWR. Last Time Buy status indicates limited future availability and is suitable only for legacy system support or short-term production runs.

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