MAX3237EIPW RS232 Transceiver - Equivalent & Substitute Parts

Part Overview

The MAX3237EIPW is a full-duplex RS232 transceiver manufactured by Texas Instruments, featuring 5 drivers and 3 receivers in a 28-TSSOP surface mount package. This interface IC operates across a 3V to 5.5V supply range and supports data rates up to 1 Mbps, making it suitable for legacy serial communication applications requiring bidirectional RS232 protocol support.

The MAX3237EIPW currently holds Last Time Buy status, indicating end-of-life transition. Identifying functionally equivalent substitute parts is essential for design continuity, long-term supply chain planning, and new production runs where active-status alternatives are preferred.

Substiute Parts

MAX3237EIPW

Texas InstrumentsIn Stock: 3450MAX3237EIPW Datasheet

Current PartRFQ

MAX3237EIPWR

Texas InstrumentsIn Stock: 7081MAX3237EIPWR Datasheet

MFR RecommendedRFQ

ICL3237ECAZ

Renesas Electronics CorporationIn Stock: 4115ICL3237ECAZ Datasheet

MFR RecommendedRFQ

ICL3237ECAZ-T

Renesas Electronics CorporationIn Stock: 2641ICL3237ECAZ-T Datasheet

MFR RecommendedRFQ

ICL3237EIAZ

Renesas Electronics CorporationIn Stock: 2138ICL3237EIAZ Datasheet

MFR RecommendedRFQ

ICL3237EIAZ-T

Renesas Electronics CorporationIn Stock: 1496ICL3237EIAZ-T Datasheet

MFR RecommendedRFQ

ST3237EBPR

STMicroelectronicsIn Stock: 63533ST3237EBPR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MAX3237EIPW is determined by strict alignment across the following critical parameters:

Core Functional Requirements:

• Protocol: RS232
• Type: Transceiver (full-duplex)
• Number of Drivers/Receivers: 5/3
• Data Rate: 1 Mbps
• Voltage Supply Range: 3V ~ 5.5V

Electrical Compatibility:

• Receiver Hysteresis: 500 mV (primary specification)
• Operating Temperature Range: -40°C ~ 85°C (extended industrial range)

Physical & Environmental:

• Mounting Type: Surface Mount
• Package Type: 28-pin SSOP or TSSOP variants
• RoHS3 Compliance
• MSL Rating: 1 or 3 (both acceptable for standard handling)

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (Same Package Footprint): MAX3237EIPWR (Texas Instruments) - Identical electrical specifications, active product status, alternative packaging option.

Category B - Functional Equivalents (Compatible Package Variants): ICL3237ECAZ, ICL3237ECAZ-T, ICL3237EIAZ, ICL3237EIAZ-T (Renesas Electronics) - Maintain all core electrical parameters and 5/3 transceiver configuration. Package variant is 28-SSOP (0.209", 5.30mm Width) versus original 28-TSSOP (0.173", 4.40mm Width). PCB layout adjustment required.

Category C - Alternative Manufacturer (Parameter Variance): ST3237EBPR (STMicroelectronics) - Meets all functional requirements with one electrical variance: Receiver Hysteresis of 300 mV (versus 500 mV specification). This lower hysteresis value provides tighter input threshold margins and may require circuit validation in noise-sensitive applications.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No PCB Modification): Select MAX3237EIPWR when maintaining the original 28-TSSOP footprint is required. This part carries Active product status from Texas Instruments, ensuring long-term availability and supply chain stability. Electrical specifications are identical to the MAX3237EIPW, providing drop-in compatibility with existing designs.

For Extended Temperature Range Applications (-40°C ~ 85°C): ICL3237EIAZ or ICL3237EIAZ-T (Renesas) are suitable when industrial temperature performance is critical. Both parts maintain the full -40°C to 85°C operating range. The -T variant (Cut Tape & Digi-Reel packaging) is preferred for high-volume production; the standard variant (Tube packaging) suits lower-volume or prototype applications. PCB layout adjustment is required due to 28-SSOP package variant.

For Commercial Temperature Range Applications (0°C ~ 70°C): ICL3237ECAZ or ICL3237ECAZ-T (Renesas) are acceptable when designs operate within standard commercial temperature limits. These parts reduce cost through narrower temperature specification. The -T variant supports automated assembly; the standard variant accommodates manual or lower-volume handling.

For Noise-Sensitive Environments: ST3237EBPR (STMicroelectronics) offers 300 mV receiver hysteresis, providing sharper input discrimination in high-noise industrial settings. This specification variance requires circuit validation to confirm compatibility with existing signal conditioning. The part maintains full -40°C to 85°C temperature range and ROHS3 compliance. High inventory availability (63,450 units) supports immediate procurement.

Compliance & Certification: All substitute parts maintain ROHS3 compliance and REACH Unaffected status, meeting regulatory requirements for EU and international markets. MSL ratings (1 or 3) are acceptable for standard PCB assembly processes; MSL 3 parts require controlled storage within 168-hour dry conditions.

Frequently Asked Questions (FAQ)

Q: Can MAX3237EIPWR replace MAX3237EIPW directly without PCB changes? A: Yes. MAX3237EIPWR uses the identical 28-TSSOP package footprint and electrical specifications. No PCB layout modification is required. Both parts are pin-compatible and functionally equivalent.

Q: What is the difference between 28-TSSOP and 28-SSOP packages? A: TSSOP (Thin Shrink Small Outline Package) measures 0.173" width; SSOP (Shrink Small Outline Package) measures 0.209" width. The SSOP variant is physically larger. PCB footprints are not interchangeable; layout redesign is necessary when switching between these package types.

Q: Why does ST3237EBPR have 300 mV hysteresis instead of 500 mV? A: Receiver hysteresis defines the input threshold margin between logic state transitions. Lower hysteresis (300 mV) provides tighter discrimination, beneficial in noise-sensitive applications but requiring cleaner input signals. Higher hysteresis (500 mV) tolerates greater signal noise. Both values meet RS232 protocol specifications; selection depends on circuit noise environment.

Q: Are Renesas ICL3237 parts suitable for -40°C to 85°C applications? A: ICL3237EIAZ and ICL3237EIAZ-T support the full -40°C to 85°C range. ICL3237ECAZ and ICL3237ECAZ-T are limited to 0°C to 70°C commercial range. Verify application temperature requirements before selection.

Q: What does MSL 1 versus MSL 3 mean for procurement? A: MSL (Moisture Sensitivity Level) indicates storage requirements. MSL 1 parts have unlimited shelf life in standard conditions. MSL 3 parts must be stored in dry conditions and used within 168 hours of bag opening. Both are suitable for standard manufacturing; MSL 3 requires controlled humidity storage.

Q: Can I use ICL3237 parts as a cost-effective alternative? A: Yes, when temperature range and package footprint changes are acceptable. Renesas ICL3237 variants are functionally equivalent and carry Active product status. PCB layout modification is required due to 28-SSOP package. Verify thermal and noise performance in your specific application.

Q: Which substitute offers the best long-term supply availability? A: ST3237EBPR (STMicroelectronics) shows the highest inventory level (63,450 units) and Active product status. MAX3237EIPWR (Texas Instruments) provides direct compatibility with minimal design risk. Both ensure sustained supply for production continuity.