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ICL3243IA RS232 Transceiver Equivalent & Substitute Parts
Part Overview
The ICL3243IA is a 3/5 full-duplex RS232 transceiver manufactured by Renesas Electronics Corporation in a 28-SSOP surface mount package. This interface IC operates across 3V to 5.5V supply voltage with a 250 kbps data rate and 300 mV receiver hysteresis. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | ICL3243IA |
| Manufacturer | Renesas Electronics Corporation |
| Type | Transceiver |
| Protocol | RS232 |
| Number of Drivers/Receivers | 3/5 |
| Duplex | Full |
| Data Rate | 250 kbps |
| Voltage Supply Range | 3V to 5.5V |
| Operating Temperature | -40°C to 85°C |
| Package / Case | 28-SSOP (0.209", 5.30mm Width) |
| Mounting Type | Surface Mount |
| Receiver Hysteresis | 300 mV |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution of the ICL3243IA is determined by the following critical parameters:
- Protocol: RS232
- Package / Case: 28-SSOP (0.209", 5.30mm Width)
- Number of Drivers/Receivers: 3/5
- Duplex: Full
- Voltage Supply Range: 3V to 5.5V
- Operating Temperature: -40°C to 85°C
- Mounting Type: Surface Mount
Substitute parts must maintain identical electrical interface specifications and physical package dimensions to ensure direct PCB compatibility. Data rate variations are acceptable when the substitute meets or exceeds the original specification. Receiver hysteresis differences do not preclude substitution when all other parameters align.
Parameter Comparison
| Part Number | Manufacturer | Protocol | Drivers/Receivers | Data Rate | Voltage Supply | Operating Temp | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| ICL3243IA | Renesas Electronics | RS232 | 3/5 | 250 kbps | 3V - 5.5V | -40°C to 85°C | 28-SSOP | Obsolete | Non-compliant |
| MAX3243EEAI+ | Analog Devices / Maxim | RS232 | 3/5 | 250 kbps | 3V - 5.5V | -40°C to 85°C | 28-SSOP | Active | ROHS3 Compliant |
| MAX3243EEAI+T | Analog Devices / Maxim | RS232 | 3/5 | 250 kbps | 3V - 5.5V | -40°C to 85°C | 28-SSOP | Active | ROHS3 Compliant |
| MAX3243EIDB | Texas Instruments | RS232 | 3/5 | 500 kbps | 3V - 5.5V | -40°C to 85°C | 28-SSOP | Obsolete | ROHS3 Compliant |
| MAX3243EIDBR | Texas Instruments | RS232 | 3/5 | 500 kbps | 3V - 5.5V | -40°C to 85°C | 28-SSOP | Active | ROHS3 Compliant |
| MAX3244EEAI+ | Analog Devices / Maxim | RS232 | 3/5 | 250 kbps | 3V - 5.5V | -40°C to 85°C | 28-SSOP | Active | ROHS3 Compliant |
| MAX3244EEAI+T | Analog Devices / Maxim | RS232 | 3/5 | 250 kbps | 3V - 5.5V | -40°C to 85°C | 28-SSOP | Active | ROHS3 Compliant |
| MAX3245EEAI+ | Analog Devices / Maxim | RS232 | 3/5 | 1 Mbps | 3V - 5.5V | -40°C to 85°C | 28-SSOP | Active | ROHS3 Compliant |
| MAX3245EEAI+T | Analog Devices / Maxim | RS232 | 3/5 | 1 Mbps | 3V - 5.5V | -40°C to 85°C | 28-SSOP | Active | ROHS3 Compliant |
| TRS3243EIDB | Texas Instruments | RS232 | 3/5 | 500 kbps | 3V - 5.5V | -40°C to 85°C | 28-SSOP | Obsolete | ROHS3 Compliant |
| TRS3243EIDBR | Texas Instruments | RS232 | 3/5 | 500 kbps | 3V - 5.5V | -40°C to 85°C | 28-SSOP | Active | ROHS3 Compliant |
Engineering Selection Recommendations
For new designs and ongoing system support, active product status parts are preferred. The MAX3243EEAI+ and MAX3243EEAI+T from Analog Devices / Maxim Integrated provide direct electrical and mechanical equivalence to the ICL3243IA while offering ROHS3 compliance and active product status. These parts are available in standard packaging configurations (Tube and Cut Tape & Digi-Reel respectively) with substantial inventory availability.
The MAX3244EEAI+ and MAX3244EEAI+T variants maintain identical electrical specifications and offer the same compliance profile with active status. The MAX3245EEAI+ and MAX3245EEAI+T series provide enhanced data rate capability (1 Mbps) while maintaining full backward compatibility with the original 250 kbps specification, offering performance headroom for future applications.
Texas Instruments TRS3243EIDBR provides an alternative from a different manufacturer with 500 kbps data rate capability and active product status, suitable for applications requiring higher throughput than the original 250 kbps specification.
Frequently Asked Questions (FAQ)
Q: Can MAX3243EEAI+ directly replace ICL3243IA on existing PCBs?
A: Yes. Both parts share identical 28-SSOP package dimensions, pin configuration, RS232 protocol, 3/5 driver/receiver configuration, and full-duplex operation across the 3V to 5.5V supply range and -40°C to 85°C operating temperature. Pin-for-pin compatibility is maintained.
Q: What is the difference between MAX3243EEAI+ and MAX3243EEAI+T?
A: Both parts are electrically identical. The primary difference is packaging: MAX3243EEAI+ is supplied in Tube packaging, while MAX3243EEAI+T is supplied in Cut Tape & Digi-Reel format. Selection depends on assembly process requirements and volume needs.
Q: Why do some substitutes have higher data rates (500 kbps or 1 Mbps)?
A: Higher data rate specifications indicate enhanced performance capability. Parts rated for 500 kbps or 1 Mbps operate at the same 250 kbps specification as the ICL3243IA without degradation, providing design margin and future application flexibility.
Q: Is RoHS compliance required for substitution?
A: RoHS compliance is a regulatory and supply chain consideration. The ICL3243IA is RoHS non-compliant, while all listed substitutes are ROHS3 compliant. For new designs and regulated applications, ROHS3 compliant parts are required. For legacy system support, non-compliance may be acceptable depending on application requirements.
Q: What is the significance of receiver hysteresis differences?
A: The ICL3243IA specifies 300 mV receiver hysteresis, while most substitutes specify 500 mV. Both values fall within RS232 standard specifications. The higher hysteresis in substitutes provides improved noise immunity without affecting functional compatibility.
Q: Can I use MAX3245 series parts as substitutes?
A: Yes. MAX3245EEAI+ and MAX3245EEAI+T are fully compatible substitutes. The 1 Mbps data rate specification exceeds the original 250 kbps requirement, ensuring backward compatibility while providing enhanced performance capability for applications requiring higher throughput.
Q: Are there inventory considerations for part selection?
A: Inventory availability varies by part number and packaging format. MAX3243EEAI+T and MAX3245EEAI+T show the highest inventory levels (15,588 and 17,641 units respectively), making them preferred for immediate procurement. TRS3243EIDBR also maintains substantial inventory (4,300 units) in active status.
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