ICL3237ECA-T RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The ICL3237ECA-T 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 component is classified as obsolete, with 2200 units available in new original stock. Due to its obsolete status, identifying functionally equivalent and direct substitute parts is essential for design continuity, system maintenance, and long-term component sourcing strategy.

Key Parameters

Parameter	Value
Manufacturer Part Number	ICL3237ECA-T
Manufacturer	Renesas Electronics Corporation
Category	Interface
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	5/3
Duplex	Full
Receiver Hysteresis	500 mV
Data Rate	1 Mbps
Voltage Supply Range	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
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 ICL3237ECA-T are classified based on strict adherence to the following critical parameters:

Primary Substitution Criteria:

Protocol: RS232
Number of Drivers/Receivers: 5/3
Duplex: Full
Voltage Supply Range: 3V ~ 5.5V
Mounting Type: Surface Mount
Package / Case: 28-SSOP (0.209", 5.30mm Width)

Secondary Compatibility Parameters:

Receiver Hysteresis: 500 mV (preferred match) or 300 mV (acceptable variance)
Data Rate: 1 Mbps (preferred match) or 250 kbps (acceptable variance)
Operating Temperature: 0°C ~ 70°C (preferred match) or -40°C ~ 85°C (extended range acceptable)

Substitutes are grouped into three categories:

Parametric Equivalent: ICL3237ECAZ-T matches all primary criteria with identical electrical specifications and differs only in product status (Active vs. Obsolete) and packaging format (Tape & Reel).

Direct Manufacturer Equivalent: ST3237EBPR (STMicroelectronics) matches all primary criteria with minor variations in receiver hysteresis (300 mV vs. 500 mV) and extended operating temperature range (-40°C ~ 85°C).

Similar Functional Equivalents: MAX3237 series parts (Analog Devices Inc./Maxim Integrated) match all primary criteria with variations in data rate (250 kbps vs. 1 Mbps) and receiver hysteresis specifications.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
ICL3237ECA-T	Renesas	RS232	5/3	500 mV	1 Mbps	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Obsolete	RoHS non-compliant
ICL3237ECAZ-T	Renesas	RS232	5/3	500 mV	1 Mbps	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
ST3237EBPR	STMicroelectronics	RS232	5/3	300 mV	1 Mbps	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	Active	ROHS3 Compliant
MAX3237CAI+	Analog Devices/Maxim	RS232	5/3	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
MAX3237CAI+T	Analog Devices/Maxim	RS232	5/3	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
MAX3237EAI+	Analog Devices/Maxim	RS232	5/3	300 mV	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	Active	ROHS3 Compliant
MAX3237EAI+T	Analog Devices/Maxim	RS232	5/3	300 mV	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	Active	ROHS3 Compliant
MAX3237ECAI+	Analog Devices/Maxim	RS232	5/3	500 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
MAX3237ECAI+T	Analog Devices/Maxim	RS232	5/3	500 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
MAX3237ECDBG4	Texas Instruments	RS232	5/3	500 mV	1 Mbps	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Discontinued at DiGi Electronics	ROHS3 Compliant
MAX3237ECPW	Texas Instruments	RS232	5/3	500 mV	1 Mbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Last Time Buy	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitute: ICL3237ECAZ-T

The ICL3237ECAZ-T is the optimal substitute for the ICL3237ECA-T. Both parts are manufactured by Renesas Electronics Corporation and share identical electrical and functional specifications. The primary advantage is that ICL3237ECAZ-T holds Active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The packaging difference (Tape & Reel vs. standard) does not affect electrical performance or pin compatibility.

Recommended Secondary Substitute: ST3237EBPR

The ST3237EBPR (STMicroelectronics) provides a direct functional equivalent with high inventory availability (63,450 units). It maintains all primary substitution criteria with identical 1 Mbps data rate and 5/3 driver/receiver configuration. The receiver hysteresis specification differs at 300 mV versus 500 mV, which represents acceptable variance for RS232 interface applications. The extended operating temperature range (-40°C ~ 85°C) provides additional thermal margin. ROHS3 compliance ensures regulatory compliance for new designs.

Alternative Substitutes: MAX3237 Series

The MAX3237 series from Analog Devices Inc./Maxim Integrated provides functional equivalents with Active product status and ROHS3 compliance. Parts with 500 mV receiver hysteresis (MAX3237ECAI+, MAX3237ECAI+T) most closely match the original specification. The data rate specification of 250 kbps represents a reduction from the original 1 Mbps; this variance is acceptable for applications not requiring maximum throughput. Multiple packaging and temperature options are available to accommodate specific design requirements.

Not Recommended: MAX3237ECPW

The MAX3237ECPW uses a 28-TSSOP package (4.40mm width) rather than the 28-SSOP package (5.30mm width) of the original part. This package difference creates physical incompatibility with existing PCB layouts and is classified as Last Time Buy, indicating limited future availability.

Frequently Asked Questions (FAQ)

Q: Can ICL3237ECAZ-T directly replace ICL3237ECA-T without PCB modifications?

A: Yes. Both parts share identical pin configurations, package dimensions (28-SSOP, 0.209" × 5.30mm), and electrical specifications. No PCB layout changes are required. The only difference is packaging format (Tape & Reel vs. standard) and product status (Active vs. Obsolete).

Q: What is the significance of the 500 mV receiver hysteresis specification?

A: Receiver hysteresis determines the voltage differential between the rising and falling threshold levels for RS232 signal detection. The 500 mV specification in the original part provides noise immunity for the receiver input. Substitutes with 300 mV hysteresis (ST3237EBPR, MAX3237 series with "A" or "C" designators) maintain functional compatibility but with reduced noise margin. This variance is acceptable for standard RS232 applications operating within normal electrical environments.

Q: Why does the MAX3237 series show 250 kbps data rate versus 1 Mbps for the original?

A: Data rate specification indicates the maximum supported communication speed. The original ICL3237ECA-T supports 1 Mbps operation. MAX3237 series parts are rated for 250 kbps. For applications requiring data rates below 250 kbps, this variance does not affect functionality. Applications requiring higher data rates should select ST3237EBPR or MAX3237ECDBG4, which maintain the 1 Mbps specification.

Q: Is RoHS compliance important for my application?

A: RoHS compliance status depends on your end-market requirements and regulatory jurisdiction. The original ICL3237ECA-T is RoHS non-compliant. All recommended substitutes (ICL3237ECAZ-T, ST3237EBPR, MAX3237 series) are ROHS3 compliant, meeting current environmental and regulatory standards. If your application or customer base requires RoHS compliance, select from the compliant alternatives.

Q: Can I use MAX3237ECPW as a substitute?

A: MAX3237ECPW is not recommended as a direct substitute. While it matches the electrical specifications and receiver hysteresis of the original part, it uses a 28-TSSOP package (4.40mm width) instead of the 28-SSOP package (5.30mm width). This physical difference creates incompatibility with existing PCB layouts and requires design modifications. Additionally, MAX3237ECPW is classified as Last Time Buy, indicating limited future availability.

Q: What is the difference between MAX3237CAI+ and MAX3237EAI+ variants?

A: Both parts are functionally equivalent RS232 transceivers with 5/3 driver/receiver configuration. The primary difference is operating temperature range: MAX3237CAI+ operates from 0°C ~ 70°C, while MAX3237EAI+ operates from -40°C ~ 85°C. Select MAX3237EAI+ for applications requiring extended temperature operation or harsh environmental conditions. Both variants are available in multiple packaging formats (Tube, Cut Tape & Digi-Reel).

Q: How do I determine which substitute is best for my design?

A: Evaluate substitutes based on three criteria: (1) Data rate requirement—if your application requires 1 Mbps, select ST3237EBPR or MAX3237ECDBG4; if 250 kbps is sufficient, MAX3237 series parts are acceptable. (2) Operating temperature—if extended range is needed, select parts rated -40°C ~ 85°C (ST3237EBPR, MAX3237EAI+, MAX3237EAI+T). (3) Regulatory compliance—if RoHS compliance is required, all substitutes except the original part meet this requirement. For most applications, ICL3237ECAZ-T or ST3237EBPR provide optimal balance of compatibility, availability, and compliance.

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