ST3243ECDR RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The ST3243ECDR is a full-duplex RS232 transceiver manufactured by STMicroelectronics, featuring 3 drivers and 5 receivers in a 28-TSSOP surface mount package. This component operates across 3V to 5.5V supply voltage with a 400 kbps data rate and 500 mV receiver hysteresis. The part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with acceptable parameter variations within RS232 transceiver standards.

Key Parameters

Parameter	ST3243ECDR Value
Manufacturer	STMicroelectronics
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Receiver Hysteresis	500 mV
Data Rate	400 kbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	28-TSSOP (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of RS232 transceiver components is determined by the following critical parameters: protocol compliance (RS232), driver/receiver configuration (3/5), duplex mode (full), supply voltage range (3V ~ 5.5V), operating temperature range (0°C ~ 70°C), and mounting type (surface mount). Parts are grouped into two categories:

Parametric Equivalent: ST3243ECTR-E maintains identical electrical specifications and 28-TSSOP package geometry, differing only in product status (active) and packaging format (cut tape/digi-reel). This part provides direct functional replacement with no design modification required.

Similar Substitutes: Parts including ICL3243CBZ, ICL3243CBZ-T, MAX3243CDW, MAX3243CDWR, MAX3243CWI+, MAX3243CWI+T, MAX3243ECDW, MAX3243ECDWR, and MAX3243ECWI+ maintain core RS232 transceiver functionality with 3/5 driver/receiver configuration and full-duplex operation. These parts operate within the same supply voltage and temperature ranges. Variations exist in receiver hysteresis (300 mV vs. 500 mV), data rate (120 kbps to 500 kbps), package type (28-SOIC vs. 28-TSSOP), and product status. Package differences require PCB layout modification for implementation.

Parameter Comparison

Part Number	Manufacturer	Type	Drivers/Receivers	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temp	Package	Product Status	MSL
ST3243ECDR	STMicroelectronics	Transceiver	3/5	500 mV	400 kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Obsolete	1
ST3243ECTR-E	STMicroelectronics	Transceiver	3/5	500 mV	400 kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active	3
ICL3243CBZ	Renesas Electronics	Transceiver	3/5	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active	3
ICL3243CBZ-T	Renesas Electronics	Transceiver	3/5	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active	3
MAX3243CDW	Texas Instruments	Transceiver	3/5	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Obsolete	1
MAX3243CDWR	Texas Instruments	Transceiver	3/5	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active	1
MAX3243CWI+	Analog Devices Inc./Maxim Integrated	Transceiver	3/5	300 mV	120 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active	1
MAX3243CWI+T	Analog Devices Inc./Maxim Integrated	Transceiver	3/5	300 mV	120 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active	1
MAX3243ECDW	Texas Instruments	Transceiver	3/5	500 mV	500 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Last Time Buy	1
MAX3243ECDWR	Texas Instruments	Transceiver	3/5	500 mV	500 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active	1
MAX3243ECWI+	Analog Devices Inc./Maxim Integrated	Transceiver	3/5	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active	1

Engineering Selection Recommendations

Primary Equivalent Selection: ST3243ECTR-E is the recommended direct replacement for ST3243ECDR. Both parts are manufactured by STMicroelectronics, maintain identical electrical specifications (500 mV receiver hysteresis, 400 kbps data rate), and utilize the same 28-TSSOP package geometry. ST3243ECTR-E holds active product status with ROHS3 compliance and REACH unaffected certification, ensuring long-term availability and regulatory compliance. The only design consideration is MSL rating difference (MSL 3 vs. MSL 1), which requires standard moisture control during storage and assembly.

Secondary Substitutes with Package Modification: MAX3243ECDWR and MAX3243ECDW provide functional equivalence with matching 500 mV receiver hysteresis and superior 500 kbps data rate capability. These Texas Instruments parts require PCB layout modification due to 28-SOIC package format versus the original 28-TSSOP. MAX3243ECDWR is preferred for new designs due to active product status. Both parts maintain ROHS3 compliance and REACH unaffected status.

Alternative Substitutes: ICL3243CBZ-T (Renesas, active status) and MAX3243ECWI+ (Analog Devices, active status) provide functional RS232 transceiver operation with 3/5 driver/receiver configuration. These parts feature 300 mV receiver hysteresis and 250 kbps data rate, representing reduced performance specifications. Implementation requires 28-SOIC package accommodation. Selection of these alternatives is appropriate when design constraints permit lower data rate operation and reduced receiver hysteresis.

Obsolete Part Avoidance: MAX3243CDW and ST3243ECDR share obsolete product status and should not be selected for new designs or long-term procurement. MAX3243ECDW carries last-time-buy status, indicating limited future availability.

Frequently Asked Questions (FAQ)

Q: Can ST3243ECTR-E directly replace ST3243ECDR without PCB modification?

A: Yes. ST3243ECTR-E is a parametric equivalent with identical 28-TSSOP package dimensions and electrical specifications. No PCB layout changes are required. The MSL rating difference (MSL 3 vs. MSL 1) requires standard moisture control procedures during component storage and assembly but does not affect electrical performance or pin compatibility.

Q: What is the primary difference between ST3243ECTR-E and MAX3243ECDWR?

A: Both parts maintain 3/5 driver/receiver RS232 transceiver functionality and 500 mV receiver hysteresis. ST3243ECTR-E uses 28-TSSOP packaging while MAX3243ECDWR uses 28-SOIC packaging, requiring PCB layout modification. MAX3243ECDWR offers higher data rate capability (500 kbps vs. 400 kbps). ST3243ECTR-E is manufactured by STMicroelectronics; MAX3243ECDWR is manufactured by Texas Instruments.

Q: Are parts with 300 mV receiver hysteresis compatible with designs specified for 500 mV hysteresis?

A: Parts with 300 mV receiver hysteresis (ICL3243CBZ-T, MAX3243ECWI+, MAX3243CWI+) provide tighter input threshold specifications than the original 500 mV specification. These parts operate within RS232 protocol standards and are functionally compatible. However, circuit designs that depend on the 500 mV hysteresis margin for noise immunity should be evaluated before substitution.

Q: Which substitute part offers the highest data rate?

A: MAX3243ECDWR and MAX3243ECDW both support 500 kbps data rate, exceeding the original ST3243ECDR specification of 400 kbps. Both parts require 28-SOIC package accommodation. MAX3243ECDWR is preferred due to active product status.

Q: What packaging options are available for RS232 3/5 transceiver substitutes?

A: The original ST3243ECDR uses 28-TSSOP packaging. Equivalent and substitute parts are available in 28-TSSOP (ST3243ECTR-E) and 28-SOIC (ICL3243CBZ, ICL3243CBZ-T, MAX3243 series variants). Package selection determines PCB footprint compatibility. 28-TSSOP and 28-SOIC packages are not interchangeable without PCB redesign.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed equivalent and substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements.

Q: What is the significance of product status (Active, Obsolete, Last Time Buy)?

A: Product status indicates component lifecycle and availability. Active status ensures ongoing manufacturing and long-term procurement availability. Obsolete status indicates discontinued production with no future availability. Last Time Buy status indicates final production run with limited remaining inventory. For new designs and long-term applications, selection of active-status components is required.

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