MAX3237ECDBRG4 Equivalent & Substitute Parts

Part Overview

The MAX3237ECDBRG4 is a full-duplex RS232 transceiver with 5 drivers and 3 receivers, packaged in a 28-SSOP surface mount configuration. This interface IC operates across a 3V to 5.5V supply range and supports data rates up to 1Mbps with 500mV receiver hysteresis. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines for ongoing design support and procurement.

Key Parameters

Parameter	MAX3237ECDBRG4 Specification
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Drivers/Receivers	5/3
Duplex	Full
Data Rate	1Mbps
Receiver Hysteresis	500mV
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	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MAX3237ECDBRG4 is determined by the following critical parameters:

Primary Compatibility Criteria:

RS232 protocol with 5 drivers and 3 receivers configuration
28-SSOP package footprint (0.209", 5.30mm Width)
Supply voltage range: 3V ~ 5.5V
Surface mount mounting type

Secondary Performance Criteria:

Data rate capability (minimum 1Mbps required for direct substitution)
Receiver hysteresis (500mV baseline; 300mV acceptable with design verification)
Operating temperature range (0°C ~ 70°C minimum; extended range -40°C ~ 85°C provides additional margin)
RoHS3 compliance and MSL rating for manufacturing compatibility

Substitute parts are grouped by their alignment with these parameters. Direct substitutes maintain all primary criteria and 1Mbps data rate. Functional equivalents meet primary criteria with reduced data rate (250kbps) but maintain electrical compatibility. Extended-range variants provide wider temperature operation for demanding applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Data Rate	Receiver Hysteresis	Operating Temp	Packaging	Inventory
MAX3237ECDBRG4	Texas Instruments	Discontinued	1Mbps	500mV	0°C ~ 70°C	28-SSOP	729 Pcs
ICL3237ECAZ	Renesas Electronics	Active	1Mbps	500mV	0°C ~ 70°C	28-SSOP	4074 Pcs
ICL3237EIAZ-T	Renesas Electronics	Active	1Mbps	500mV	-40°C ~ 85°C	28-SSOP	1486 Pcs
ICL3237ECAZ-T	Renesas Electronics	Active	1Mbps	500mV	0°C ~ 70°C	28-SSOP	2600 Pcs
ST3237EBPR	STMicroelectronics	Active	1Mbps	300mV	-40°C ~ 85°C	28-SSOP	63450 Pcs
MAX3237ECAI+	Analog Devices/Maxim	Active	250kbps	500mV	0°C ~ 70°C	28-SSOP	2200 Pcs
MAX3237ECAI+T	Analog Devices/Maxim	Active	250kbps	500mV	0°C ~ 70°C	28-SSOP	2605 Pcs
MAX3237EEAI+	Analog Devices/Maxim	Active	250kbps	500mV	-40°C ~ 85°C	28-SSOP	2156 Pcs
MAX3237CAI+	Analog Devices/Maxim	Active	250kbps	300mV	0°C ~ 70°C	28-SSOP	1900 Pcs
MAX3237EAI+	Analog Devices/Maxim	Active	250kbps	300mV	-40°C ~ 85°C	28-SSOP	2200 Pcs
MAX3237EAI+T	Analog Devices/Maxim	Active	250kbps	300mV	-40°C ~ 85°C	28-SSOP	4260 Pcs

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (1Mbps, 500mV Hysteresis, Standard Temperature):

ICL3237ECAZ and ICL3237ECAZ-T from Renesas Electronics provide direct parameter equivalence to the MAX3237ECDBRG4 with active product status. Both maintain 1Mbps data rate and 500mV receiver hysteresis. ICL3237ECAZ operates within the original 0°C ~ 70°C range with 4074 units in stock. ICL3237ECAZ-T extends operation to -40°C ~ 85°C with 2600 units available, suitable for applications requiring wider temperature margins.

Tier 2 - Extended Temperature Substitutes (1Mbps, 500mV Hysteresis, Extended Temperature):

ICL3237EIAZ-T from Renesas Electronics maintains full 1Mbps performance with 500mV hysteresis across -40°C ~ 85°C operating range. This variant accommodates industrial and automotive temperature requirements with 1486 units in stock.

Tier 3 - High-Availability Substitute (1Mbps, 300mV Hysteresis, Extended Temperature):

ST3237EBPR from STMicroelectronics delivers 1Mbps data rate with reduced receiver hysteresis (300mV) and extended temperature operation (-40°C ~ 85°C). Highest inventory availability at 63450 units. The 300mV hysteresis remains within acceptable noise margin for standard RS232 applications. MSL rating of 3 (168 hours) requires moisture control during storage and assembly.

Tier 4 - Reduced Data Rate Alternatives (250kbps, Active Status):

MAX3237 variants from Analog Devices/Maxim Integrated (ECAI+, ECAI+T, EEAI+, CAI+, EAI+, EAI+T) operate at 250kbps with active product status and unlimited MSL rating. These are suitable for applications where 250kbps data rate meets system requirements. Extended-range variants (EEAI+, EAI+, EAI+T) support -40°C ~ 85°C operation.

Frequently Asked Questions (FAQ)

Q: Can MAX3237ECDBRG4 be directly replaced with a 250kbps variant?

A: Direct replacement depends on application data rate requirements. If the system operates at or below 250kbps, MAX3237 variants (ECAI+, EEAI+, EAI+) are functionally compatible. If the application requires 1Mbps capability, Renesas ICL3237 or STMicroelectronics ST3237EBPR are required.

Q: What is the difference between 500mV and 300mV receiver hysteresis?

A: Receiver hysteresis defines the voltage differential between logic state transitions. 500mV provides greater noise immunity in electrically noisy environments. 300mV hysteresis (ST3237EBPR, MAX3237CAI+, MAX3237EAI+) is acceptable for standard RS232 applications with adequate signal integrity. Selection depends on system noise characteristics.

Q: Does operating temperature range affect substitution eligibility?

A: Operating temperature range does not prevent substitution but indicates application suitability. Standard-range parts (0°C ~ 70°C) are suitable for commercial environments. Extended-range parts (-40°C ~ 85°C) accommodate industrial, automotive, and outdoor applications. Selection should match the intended deployment environment.

Q: What is the significance of MSL rating differences?

A: Moisture Sensitivity Level (MSL) indicates moisture absorption limits during storage and assembly. MSL 1 (Unlimited) parts like MAX3237 variants have no moisture exposure restrictions. MSL 3 (168 hours) parts like ICL3237 and ST3237EBPR require controlled storage and must be assembled within 168 hours of package opening. Manufacturing process compatibility should be verified with assembly partners.

Q: Are all substitute parts available in the same packaging options?

A: Packaging availability varies by manufacturer and part variant. ICL3237ECAZ is supplied in Tube packaging. ICL3237EIAZ-T and ICL3237ECAZ-T are supplied in Cut Tape/Digi-Reel and Tape & Reel formats respectively. ST3237EBPR is supplied in Cut Tape/Digi-Reel. MAX3237 variants are available in Tube or Cut Tape/Digi-Reel formats. Verify packaging compatibility with procurement and assembly requirements.

Q: Which substitute offers the best inventory availability?

A: ST3237EBPR from STMicroelectronics provides the highest inventory level at 63450 units, combined with 1Mbps data rate and extended temperature operation. This part is recommended for applications where 300mV hysteresis is acceptable and high availability is a procurement priority.

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