ICL3237CAZ RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The ICL3237CAZ is a full-duplex RS232 transceiver manufactured by Renesas Electronics Corporation, featuring 5 drivers and 3 receivers in a 28-SSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The ICL3237CAZ operates across a 3V to 5.5V supply range with a 1Mbps data rate and 500mV receiver hysteresis, suitable for legacy serial communication applications requiring full RS232 protocol compliance.

Key Parameters

Parameter	ICL3237CAZ Value
Manufacturer	Renesas Electronics Corporation
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	5/3
Duplex	Full
Data Rate	1Mbps
Receiver Hysteresis	500 mV
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	28-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the ICL3237CAZ is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Protocol: RS232 full-duplex
Driver/Receiver Configuration: 5/3
Package Type: 28-SSOP (0.209", 5.30mm Width)
Supply Voltage Range: 3V ~ 5.5V
Mounting Type: Surface Mount
RoHS3 Compliance

Secondary Compatibility Factors:

Data Rate: 1Mbps (primary part specification)
Receiver Hysteresis: 500mV (primary part specification)
Operating Temperature Range: 0°C ~ 70°C (primary part specification)

Substitutes are classified into two categories:

Parametric Equivalent: ICL3237ECAZ matches all primary and secondary parameters identically, differing only in product status (Active vs. Obsolete) and packaging format (Tube).

Similar Substitutes: MAX3237 series parts from Analog Devices Inc./Maxim Integrated and Texas Instruments variants meet primary equivalence criteria but exhibit variations in data rate (250kbps vs. 1Mbps), receiver hysteresis (300mV vs. 500mV), operating temperature range, and MSL ratings. These parts maintain functional compatibility within RS232 transceiver applications while introducing parameter trade-offs.

Parameter Comparison

Part Number	Manufacturer	Product Status	Data Rate	Receiver Hysteresis	Operating Temperature	Package	MSL Rating
ICL3237CAZ	Renesas Electronics	Obsolete	1Mbps	500 mV	0°C ~ 70°C	28-SSOP	3 (168 Hours)
ICL3237ECAZ	Renesas Electronics	Active	1Mbps	500 mV	0°C ~ 70°C	28-SSOP	3 (168 Hours)
MAX3237CAI+	Analog Devices/Maxim	Active	250kbps	300 mV	0°C ~ 70°C	28-SSOP	1 (Unlimited)
MAX3237CAI+T	Analog Devices/Maxim	Active	250kbps	300 mV	0°C ~ 70°C	28-SSOP	1 (Unlimited)
MAX3237EAI+	Analog Devices/Maxim	Active	250kbps	300 mV	-40°C ~ 85°C	28-SSOP	1 (Unlimited)
MAX3237EAI+T	Analog Devices/Maxim	Active	250kbps	300 mV	-40°C ~ 85°C	28-SSOP	1 (Unlimited)
MAX3237ECAI+	Analog Devices/Maxim	Active	250kbps	500 mV	0°C ~ 70°C	28-SSOP	1 (Unlimited)
MAX3237ECAI+T	Analog Devices/Maxim	Active	250kbps	500 mV	0°C ~ 70°C	28-SSOP	1 (Unlimited)
MAX3237ECDBR	Texas Instruments	Active	1Mbps	500 mV	0°C ~ 70°C	28-SSOP	1 (Unlimited)
MAX3237ECPW	Texas Instruments	Last Time Buy	1Mbps	500 mV	0°C ~ 70°C	28-TSSOP	1 (Unlimited)
MAX3237ECPWR	Texas Instruments	Last Time Buy	1Mbps	500 mV	0°C ~ 70°C	28-TSSOP	1 (Unlimited)

Engineering Selection Recommendations

First Priority - Direct Parametric Equivalent: ICL3237ECAZ is the recommended primary substitute. This part maintains identical electrical specifications and operating parameters to the ICL3237CAZ while offering Active product status and improved availability (4074 units in stock vs. 2152 units). The transition from Tube packaging to the original format presents no functional impact for surface mount assembly operations.

Secondary Priority - Full Specification Match with Extended Support: MAX3237ECDBR from Texas Instruments provides complete parameter alignment including 1Mbps data rate and 500mV receiver hysteresis. This part carries Active status with superior MSL rating (1 vs. 3) and maintains the 28-SSOP package footprint. Selection of this part is appropriate for applications requiring extended product lifecycle support and higher moisture tolerance.

Conditional Substitutes - Reduced Data Rate Applications: MAX3237ECAI+ and MAX3237ECAI+T are suitable for applications where 250kbps data rate meets functional requirements. These parts preserve the 500mV receiver hysteresis specification and 0°C to 70°C operating range while offering improved MSL ratings and Active product status. Verification that application serial communication protocols do not exceed 250kbps is required before selection.

Extended Temperature Range Option: MAX3237EAI+ and MAX3237EAI+T extend operating temperature to -40°C to 85°C, supporting applications requiring wider thermal operating windows. These parts operate at 250kbps with 300mV receiver hysteresis and carry Active status with unlimited MSL rating.

End-of-Life Consideration: MAX3237ECPW and MAX3237ECPWR carry Last Time Buy status and feature 28-TSSOP packaging (0.173", 4.40mm Width), which differs from the 28-SSOP footprint. PCB layout modification is required for these parts and should be considered only when other substitutes are unavailable.

Frequently Asked Questions (FAQ)

Q: Can ICL3237ECAZ directly replace ICL3237CAZ without design changes? A: Yes. ICL3237ECAZ is a parametric equivalent with identical electrical specifications, supply voltage range, operating temperature, data rate, and receiver hysteresis. The only differences are product status (Active vs. Obsolete) and packaging format (Tube). No circuit modifications are required.

Q: What is the primary difference between ICL3237ECAZ and MAX3237ECDBR? A: Both parts match the ICL3237CAZ in data rate (1Mbps), receiver hysteresis (500mV), and operating temperature (0°C to 70°C). The key difference is manufacturer: ICL3237ECAZ is Renesas Electronics, while MAX3237ECDBR is Texas Instruments. MAX3237ECDBR offers superior MSL rating (1 vs. 3) and Active product status.

Q: Can MAX3237 series parts with 250kbps data rate replace the 1Mbps ICL3237CAZ? A: Functional compatibility depends on application requirements. If the RS232 communication protocol operates below 250kbps, MAX3237CAI+, MAX3237ECAI+, and related variants are compatible. Applications requiring 1Mbps operation must use ICL3237ECAZ or MAX3237ECDBR.

Q: What does MSL rating mean for this transceiver? A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient conditions (30°C, 85% relative humidity) before soldering. ICL3237CAZ has MSL 3 (168 hours maximum), while most MAX3237 variants have MSL 1 (unlimited). Higher MSL ratings provide greater manufacturing flexibility and reduced risk of moisture-induced failures during assembly.

Q: Are MAX3237ECPW and MAX3237ECPWR suitable substitutes? A: These parts match electrical specifications but use 28-TSSOP packaging (0.173", 4.40mm Width) instead of 28-SSOP (0.209", 5.30mm Width). PCB layout modification is required. Both parts carry Last Time Buy status, indicating limited future availability. Selection should occur only when other substitutes are unavailable.

Q: What is the difference between receiver hysteresis values of 300mV and 500mV? A: Receiver hysteresis determines the voltage difference between logic high and low thresholds. The 500mV specification in ICL3237CAZ provides greater noise immunity in noisy environments. The 300mV specification in some MAX3237 variants reduces hysteresis, which may affect performance in applications with marginal signal quality. Application signal integrity analysis is necessary before selecting lower hysteresis parts.

Q: Do all substitutes maintain ROHS3 compliance? A: Yes. All listed substitute parts carry ROHS3 Compliant status, ensuring compatibility with environmental regulations and procurement requirements matching the original ICL3237CAZ specification.

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