TRSF3243CDW RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRSF3243CDW is a full-duplex RS232 transceiver IC manufactured by Texas Instruments, featuring 3 drivers and 5 receivers in a 28-SOIC surface mount package. This device operates across a 3V to 5.5V supply range and supports data rates up to 1 Mbps with 500 mV receiver hysteresis. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

TRSF3243CDW

Texas InstrumentsIn Stock: 910TRSF3243CDW Datasheet

Current PartRFQ

MAX3243ECDWR

Texas InstrumentsIn Stock: 3793MAX3243ECDWR Datasheet

MFR RecommendedRFQ

SN75C3243DW

Texas InstrumentsIn Stock: 1119SN75C3243DW Datasheet

Parametric EquivalentRFQ

MAX3243ECWI+

Analog Devices Inc./Maxim IntegratedIn Stock: 2403MAX3243ECWI+ Datasheet

DirectRFQ

MAX3244ECWI+

Analog Devices Inc./Maxim IntegratedIn Stock: 1101MAX3244ECWI+ Datasheet

DirectRFQ

MAX3245ECWI+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1204MAX3245ECWI+T Datasheet

DirectRFQ

MAX3245CWI+

Analog Devices Inc./Maxim IntegratedIn Stock: 922MAX3245CWI+ Datasheet

Parametric EquivalentRFQ

MAX3245ECWI+

Analog Devices Inc./Maxim IntegratedIn Stock: 1080MAX3245ECWI+ Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TRSF3243CDW is determined by strict alignment of the following critical parameters:

Core Compatibility Parameters:

• Protocol: RS232
• Number of Drivers/Receivers: 3/5
• Duplex: Full
• Voltage - Supply: 3V ~ 5.5V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (0.295", 7.50mm Width)

Secondary Parameters (Allowable Variation):

• Data Rate: 250 kbps to 1 Mbps
• Receiver Hysteresis: 300 mV to 500 mV

All substitute parts listed maintain identical core compatibility parameters. Variations in data rate and receiver hysteresis remain within acceptable operational ranges for RS232 transceiver applications. Packaging format (Tube, Tape & Reel, Cut Tape) does not affect electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: MAX3243ECDWR

MAX3243ECDWR is the manufacturer-recommended substitute from Texas Instruments. It maintains active product status with the highest available inventory (3782 units). This part is ROHS3 compliant and carries identical electrical specifications except for a reduced data rate of 500 kbps, which remains suitable for standard RS232 communication protocols. The Cut Tape and Digi-Reel packaging format supports automated assembly processes.

Secondary Recommendation: SN75C3243DW

SN75C3243DW is a parametric equivalent from Texas Instruments with Last Time Buy status. It matches the original 1 Mbps data rate and 500 mV receiver hysteresis. This part is appropriate for applications requiring maximum data throughput and is ROHS3 compliant.

Alternative Options: MAX3245 Series (MAX3245ECWI+T, MAX3245CWI+, MAX3245ECWI+)

The MAX3245 series from Analog Devices Inc./Maxim Integrated provides full parametric equivalence with 1 Mbps data rate and 500 mV receiver hysteresis. All variants are active products with ROHS3 compliance. Selection among these three variants depends on packaging requirements: Tape & Reel (MAX3245ECWI+T) for automated assembly, or Tube format (MAX3245CWI+, MAX3245ECWI+) for manual handling.

Acceptable Alternatives: MAX3243ECWI+ and MAX3244ECWI+

MAX3243ECWI+ and MAX3244ECWI+ are direct substitutes with reduced data rates (250 kbps) and acceptable receiver hysteresis values. These parts are suitable for applications where maximum data rate is not a critical requirement. Both are active products from Analog Devices Inc./Maxim Integrated with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I use MAX3243ECDWR as a direct replacement for TRSF3243CDW?

A: Yes. MAX3243ECDWR is the manufacturer-recommended substitute. It maintains all core RS232 transceiver specifications (3/5 drivers/receivers, full-duplex, 3V–5.5V supply, 0°C–70°C operating range, 28-SOIC package). The data rate is reduced to 500 kbps, which is compatible with standard RS232 applications.

Q: What is the difference between the MAX3245 variants (MAX3245ECWI+T, MAX3245CWI+, MAX3245ECWI+)?

A: All three MAX3245 variants are electrically identical with 1 Mbps data rate and 500 mV receiver hysteresis. The differences are packaging format only: MAX3245ECWI+T is supplied in Tape & Reel format for automated pick-and-place assembly, while MAX3245CWI+ and MAX3245ECWI+ are supplied in Tube format for manual handling.

Q: Why do some substitutes have lower data rates (250 kbps) than the original (1 Mbps)?

A: RS232 communication protocols operate reliably across a wide range of data rates. The 250 kbps variants (MAX3243ECWI+, MAX3244ECWI+) are fully functional substitutes for applications that do not require maximum throughput. Selection should be based on actual system requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and carry identical REACH and ECCN classifications as the original TRSF3243CDW.

Q: What is the significance of "Last Time Buy" status for SN75C3243DW?

A: Last Time Buy status indicates that the manufacturer will accept orders until a specified cutoff date, after which the part will be discontinued. SN75C3243DW remains a valid substitute but should be considered for long-term inventory planning. Active product alternatives (MAX3243ECDWR, MAX3245 series) are recommended for new designs requiring extended product availability.

Q: Can I mix different substitute parts in the same production run?

A: Yes. All listed substitutes are electrically compatible and use identical 28-SOIC packaging. However, maintaining consistent part sourcing within a single production batch is recommended for traceability and quality control purposes.