MAX243CWE+ RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX243CWE+ is a 2/2 full-duplex RS232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in a 16-SOIC surface mount package. This interface IC is designed for serial communication applications requiring RS232 protocol compliance. The part is currently listed as obsolete, making identification of suitable equivalent and substitute components essential for ongoing system support, design updates, and procurement planning.

Substiute Parts

MAX243CWE+

Analog Devices Inc./Maxim IntegratedIn Stock: 747MAX243CWE+ Datasheet

Current PartRFQ

MAX232ACWE+

Analog Devices Inc./Maxim IntegratedIn Stock: 1360MAX232ACWE+ Datasheet

Parametric EquivalentRFQ

MAX202CDW

Texas InstrumentsIn Stock: 76428MAX202CDW Datasheet

MFR RecommendedRFQ

MAX202IDW

Texas InstrumentsIn Stock: 3944MAX202IDW Datasheet

MFR RecommendedRFQ

MAX202IDWR

Texas InstrumentsIn Stock: 4860MAX202IDWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX243CWE+ is determined by strict equivalence across the following critical parameters:

• Protocol: RS232 full-duplex transceiver functionality
• Driver/Receiver Configuration: 2/2 channel architecture
• Package: 16-SOIC surface mount form factor
• Electrical Specifications: Supply voltage range 4.5V ~ 5.5V, receiver hysteresis 500 mV
• Compliance: ROHS3 compliance, MSL Level 1, REACH unaffected status
• Data Rate Capability: Minimum 200 kbps support

Substitute parts are grouped into two categories: parametric equivalents (matching all key specifications) and manufacturer-recommended alternatives (meeting functional requirements with minor specification variations).

Parameter Comparison

Engineering Selection Recommendations

MAX232ACWE+ (Parametric Equivalent)

The MAX232ACWE+ is a direct parametric equivalent to the MAX243CWE+, matching all critical electrical and mechanical specifications. Both parts are manufactured by Analog Devices Inc./Maxim Integrated and share identical protocol, channel configuration, package, and compliance certifications. The MAX232ACWE+ maintains active product status, making it the preferred choice for new designs and ongoing procurement. Inventory availability is higher (1315 pcs vs. 654 pcs), supporting supply chain continuity.

MAX202IDWR (Manufacturer-Recommended Alternative)

The MAX202IDWR is a Texas Instruments equivalent offering full functional compatibility with the MAX243CWE+. This part maintains the 2/2 RS232 transceiver architecture, 16-SOIC package, and all compliance requirements. The MAX202IDWR features an extended operating temperature range (-40°C ~ 85°C) compared to the MAX243CWE+ (0°C ~ 70°C), providing broader environmental capability. Product status is active with substantial inventory (4767 pcs). The data rate specification is 120 kbps, which is lower than the MAX243CWE+ (200 kbps), but remains suitable for standard RS232 serial communication applications.

MAX202CDW (Manufacturer-Recommended Alternative)

The MAX202CDW is a Texas Instruments equivalent with identical functional specifications to the MAX243CWE+ across protocol, channel configuration, package, and compliance. This part is listed as Last Time Buy status, indicating limited future availability. Data rate is specified at 120 kbps. Inventory is substantial (76380 pcs), but procurement should prioritize active-status alternatives for long-term supply assurance.

MAX202IDW (Manufacturer-Recommended Alternative)

The MAX202IDW is a Texas Instruments equivalent with full functional compatibility. This part is obsolete, matching the MAX243CWE+ in product status. Extended operating temperature range (-40°C ~ 85°C) is provided. Inventory is limited (3900 pcs). This part is suitable only for replacement applications where supply is immediately available.

Frequently Asked Questions (FAQ)

Q: Can MAX232ACWE+ directly replace MAX243CWE+ without circuit modification?

A: Yes. The MAX232ACWE+ is a parametric equivalent matching all electrical specifications, supply voltage range, operating temperature, receiver hysteresis, and 16-SOIC package dimensions. Pin-to-pin compatibility is maintained, allowing direct substitution in existing circuit designs.

Q: What is the difference between MAX202IDWR and MAX243CWE+ in terms of data rate?

A: The MAX243CWE+ supports 200 kbps data rate, while MAX202IDWR supports 120 kbps. For standard RS232 serial communication at typical baud rates (9600, 19200, 38400 bps), both parts are functionally equivalent. The lower data rate specification of MAX202IDWR does not impact compatibility with conventional serial protocols.

Q: Why do some substitute parts have extended operating temperature ranges?

A: MAX202IDWR and MAX202IDW specify -40°C ~ 85°C operating temperature, compared to MAX243CWE+ at 0°C ~ 70°C. Extended temperature range indicates qualification for broader environmental conditions. For applications operating within 0°C ~ 70°C, both specifications are equivalent. Extended range parts provide additional design margin for temperature-sensitive applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (MAX232ACWE+, MAX202CDW, MAX202IDW, MAX202IDWR) maintain ROHS3 compliance, MSL Level 1, and REACH unaffected status, matching the MAX243CWE+ compliance profile.

Q: Which substitute part should be selected for new designs?

A: MAX232ACWE+ is recommended for new designs. This part maintains active product status, parametric equivalence to MAX243CWE+, and is manufactured by the same supplier (Analog Devices Inc./Maxim Integrated). MAX202IDWR is an alternative if Texas Instruments sourcing is preferred, with the advantage of extended operating temperature range and active product status.

Q: What is the significance of "Last Time Buy" status for MAX202CDW?

A: Last Time Buy status indicates the manufacturer has announced end-of-life for this part. While current inventory is substantial (76380 pcs), future procurement will not be available. This part is suitable only for immediate replacement needs. For ongoing production or new designs, select MAX232ACWE+ or MAX202IDWR.