DS14C535MSA RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The DS14C535MSA is a 3/5 transceiver IC implementing full-duplex RS232 communication, manufactured by Texas Instruments in a 28-SSOP surface mount package. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support, redesigns, and production continuity. The DS14C535MSA operates within a 4.5V to 5.5V supply range with a maximum data rate of 128 kbps and supports operating temperatures from 0°C to 70°C.

Substiute Parts

DS14C535MSA

Texas InstrumentsIn Stock: 3092DS14C535MSA Datasheet

Current PartRFQ

ICL3243ECAZ

Renesas Electronics CorporationIn Stock: 2737ICL3243ECAZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS14C535MSA is determined by strict alignment of the following critical parameters:

• Protocol and Channel Configuration: RS232 protocol with 3/5 driver/receiver configuration and full-duplex operation
• Package Compatibility: 28-SSOP surface mount package with identical 0.209" width and 5.30mm dimensions
• Electrical Interface: Supply voltage range and operating temperature range must support the application requirements
• Mounting Type: Surface mount technology for PCB compatibility

The ICL3243ECAZ from Renesas Electronics Corporation meets these substitution criteria. While the ICL3243ECAZ offers enhanced specifications (wider supply voltage range of 3V to 5.5V, higher data rate of 250 kbps, and improved receiver hysteresis of 500 mV), it maintains functional equivalence through identical channel configuration, package form factor, and protocol implementation.

Parameter Comparison

Engineering Selection Recommendations

The ICL3243ECAZ is the primary substitute for the obsolete DS14C535MSA based on the following engineering criteria:

Product Status and Availability: The DS14C535MSA is obsolete, while the ICL3243ECAZ maintains active production status, ensuring long-term availability and supply chain stability.

Regulatory Compliance: The ICL3243ECAZ is ROHS3 compliant, addressing modern regulatory requirements. The original DS14C535MSA is RoHS non-compliant, which may present procurement and environmental compliance challenges in new designs or production runs.

Functional Equivalence: Both parts implement identical RS232 protocol with 3/5 driver/receiver configuration in the same 28-SSOP package, ensuring direct PCB compatibility without layout modifications.

Enhanced Specifications: The ICL3243ECAZ provides superior performance characteristics including extended supply voltage range (3V to 5.5V versus 4.5V to 5.5V), higher data rate capability (250 kbps versus 128 kbps), and improved receiver hysteresis (500 mV versus 1 V), offering design flexibility for future applications.

Moisture Sensitivity: The ICL3243ECAZ features MSL 2 (1 Year) compared to MSL 4 (72 Hours) for the original part, reducing handling and storage constraints during manufacturing.

Frequently Asked Questions (FAQ)

Q: Can the ICL3243ECAZ be used as a direct replacement for the DS14C535MSA without PCB modifications?

A: Yes. Both parts share identical 28-SSOP package dimensions (0.209" width, 5.30mm), surface mount configuration, and pin-compatible RS232 transceiver architecture with 3/5 driver/receiver channels. No PCB layout changes are required.

Q: What are the key differences between these parts?

A: The primary differences are product status (obsolete versus active), regulatory compliance (RoHS non-compliant versus ROHS3 compliant), supply voltage range (4.5V–5.5V versus 3V–5.5V), maximum data rate (128 kbps versus 250 kbps), and moisture sensitivity level (MSL 4 versus MSL 2). Functionally, both implement full-duplex RS232 communication with identical channel configuration.

Q: Is the wider supply voltage range of the ICL3243ECAZ a concern?

A: No. The ICL3243ECAZ supply range of 3V to 5.5V encompasses the original part's 4.5V to 5.5V range. Applications designed for the DS14C535MSA will operate within the compatible voltage window of the substitute.

Q: Does the higher data rate of the ICL3243ECAZ affect compatibility?

A: No. The 250 kbps maximum data rate of the ICL3243ECAZ exceeds the 128 kbps specification of the DS14C535MSA. Systems operating at or below 128 kbps will function identically. The higher capability provides design margin and future scalability.

Q: What is the significance of the improved receiver hysteresis in the ICL3243ECAZ?

A: The ICL3243ECAZ features 500 mV receiver hysteresis compared to 1 V in the DS14C535MSA. Lower hysteresis improves noise immunity and signal detection sensitivity, providing enhanced performance in noisy environments without affecting compatibility in standard applications.

Q: Are there any compliance or certification considerations?

A: The ICL3243ECAZ is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards. The DS14C535MSA is RoHS non-compliant. For new designs or production runs subject to RoHS requirements, the ICL3243ECAZ is the appropriate choice.

Q: What is the impact of the different MSL ratings?

A: The ICL3243ECAZ has MSL 2 (1 Year shelf life), while the DS14C535MSA has MSL 4 (72 Hours). MSL 2 provides significantly longer storage stability and reduces handling constraints during manufacturing and logistics, lowering the risk of moisture-related failures.