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ISO35DWG4 RS422/RS485 Digital Isolator Equivalent & Substitute Parts
Part Overview
The ISO35DWG4 is a RS422/RS485 digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage, 3-channel configuration, and 1Mbps data rate with 25kV/µs common mode transient immunity. The device is packaged in 16-SOIC form factor and operates across -40°C to 85°C temperature range.
This part is currently obsolete. Equivalent and substitute parts are available from both Texas Instruments and Analog Devices Inc./Maxim Integrated product lines, offering active product status with maintained or enhanced electrical specifications.
Substiute Parts
Key Parameters
| Parameter | ISO35DWG4 |
|---|---|
| Manufacturer | Texas Instruments |
| Product Status | Obsolete |
| Type | RS422, RS485 |
| Technology | Capacitive Coupling |
| Number of Channels | 3 |
| Inputs - Side 1/Side 2 | 2/1 |
| Channel Type | Unidirectional |
| Voltage - Isolation | 2500Vrms |
| Common Mode Transient Immunity (Min) | 25kV/µs |
| Data Rate | 1Mbps |
| Voltage - Supply | 3.15V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C |
| Package / Case | 16-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution for the ISO35DWG4 is determined by the following critical parameters:
- Package Compatibility: All substitutes maintain 16-SOIC (0.295", 7.50mm Width) form factor for direct PCB replacement
- Functional Type: RS422/RS485 digital isolator with 3-channel, 2/1 input configuration and unidirectional channel type
- Isolation Technology: Capacitive coupling technology maintained across all substitutes
- Operating Temperature Range: -40°C to 85°C maintained across all alternatives
- Mounting Type: Surface mount compatibility required
Substitutes are grouped into two categories based on isolation voltage and data rate specifications:
Category 1 - Direct Functional Equivalent (ISO35DWR): Maintains identical electrical specifications (2500Vrms isolation, 1Mbps data rate, 25kV/µs CMTI) with active product status and improved packaging options.
Category 2 - Enhanced Specifications (MAX14945, MAX14948, MAX14949 series): Offer higher isolation voltage (2750Vrms or 5000Vrms) and improved common mode transient immunity (35kV/µs typical), with reduced data rate (500kbps). These parts provide superior isolation performance for applications requiring enhanced noise immunity.
Parameter Comparison
| Parameter | ISO35DWG4 | ISO35DWR | MAX14945EWE+ | MAX14945EWE+T | MAX14948EWE+ | MAX14948EWE+T | MAX14949EWE+ | MAX14949EWE+T |
|---|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active |
| Type | RS422, RS485 | RS422, RS485 | RS422, RS485 | RS422, RS485 | RS422, RS485 | RS422, RS485 | RS422, RS485 | RS422, RS485 |
| Number of Channels | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Inputs - Side 1/Side 2 | 2/1 | 2/1 | 2/1 | 2/1 | 2/1 | 2/1 | 2/1 | 2/1 |
| Channel Type | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional | Unidirectional |
| Voltage - Isolation | 2500Vrms | 2500Vrms | 2750Vrms | 2750Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms |
| Common Mode Transient Immunity (Min) | 25kV/µs | 25kV/µs | 35kV/µs (Typ) | 35kV/µs (Typ) | 35kV/µs (Typ) | 35kV/µs (Typ) | 35kV/µs (Typ) | 35kV/µs (Typ) |
| Data Rate | 1Mbps | 1Mbps | 500kbps | 500kbps | 500kbps | 500kbps | 500kbps | 500kbps |
| Voltage - Supply | 3.15V ~ 3.6V | 3.15V ~ 3.6V | 1.71V ~ 5.5V, 4.5V ~ 5.5V | 1.71V ~ 5.5V, 4.5V ~ 5.5V | 1.71V ~ 5.5V, 4.5V ~ 5.5V | 1.71V ~ 5.5V, 4.5V ~ 5.5V | 3V ~ 5.5V, 4.5V ~ 5.5V | 3V ~ 5.5V, 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Package / Case | 16-SOIC (0.295", 7.50mm Width) | 16-SOIC (0.295", 7.50mm Width) | 16-SOIC (0.295", 7.50mm Width) | 16-SOIC (0.295", 7.50mm Width) | 16-SOIC (0.295", 7.50mm Width) | 16-SOIC (0.295", 7.50mm Width) | 16-SOIC (0.295", 7.50mm Width) | 16-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) | 2 (1 Year) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
For Direct Replacement (Identical Specifications)
ISO35DWR is the primary substitute for ISO35DWG4. Both parts maintain identical electrical specifications: 2500Vrms isolation voltage, 1Mbps data rate, and 25kV/µs common mode transient immunity. ISO35DWR holds active product status and is available in multiple packaging options (Cut Tape and Digi-Reel), ensuring long-term supply continuity. This part is suitable for applications where the original performance envelope must be maintained without modification.
For Enhanced Isolation Performance
MAX14948EWE+T and MAX14948EWE+ offer 5000Vrms isolation voltage with 35kV/µs common mode transient immunity, doubling the isolation specification of the original part. These parts operate at 500kbps data rate. The MAX14948EWE+T variant in Tape & Reel packaging provides the highest inventory availability (27,925 units) and MSL 1 rating for unlimited shelf life.
MAX14945EWE+ and MAX14945EWE+T provide intermediate isolation performance at 2750Vrms with 35kV/µs CMTI and 500kbps data rate. These parts are suitable for applications requiring improved noise immunity without the full isolation voltage increase.
MAX14949EWE+ and MAX14949EWE+T deliver 5000Vrms isolation with 35kV/µs CMTI at 500kbps data rate, with supply voltage range of 3V to 5.5V.
All Analog Devices substitutes feature MSL 1 rating (unlimited shelf life) compared to the original part's MSL 2 rating, providing superior moisture handling characteristics. All substitutes maintain ROHS3 compliance and EAR99 export classification.
Frequently Asked Questions (FAQ)
Q: Can ISO35DWR be used as a direct drop-in replacement for ISO35DWG4?
A: Yes. ISO35DWR maintains identical electrical specifications (2500Vrms isolation, 1Mbps data rate, 25kV/µs CMTI) and package form factor (16-SOIC). Both parts support the same operating temperature range (-40°C to 85°C) and supply voltage (3.15V to 3.6V). The primary difference is product status: ISO35DWR is active while ISO35DWG4 is obsolete.
Q: What is the key difference between the MAX14945 and MAX14948 series?
A: The MAX14945 series provides 2750Vrms isolation voltage, while MAX14948 and MAX14949 series provide 5000Vrms isolation voltage. Both offer 35kV/µs common mode transient immunity (typical) and 500kbps data rate. Selection depends on the isolation voltage requirement of the application.
Q: Why do the Maxim substitutes operate at 500kbps instead of 1Mbps?
A: The MAX14945, MAX14948, and MAX14949 series are specified for 500kbps data rate. Applications requiring 1Mbps operation should use ISO35DWR, which maintains the original 1Mbps specification.
Q: What packaging options are available for each substitute?
A: ISO35DWR is available in Cut Tape (CT) and Digi-Reel packaging. MAX14945EWE+ and MAX14948EWE+ are supplied in Tube packaging. MAX14945EWE+T and MAX14948EWE+T are supplied in Tape & Reel (TR) packaging. MAX14949EWE+ is supplied in Tube packaging, while MAX14949EWE+T packaging is not specified in available data.
Q: Are all substitutes RoHS compliant?
A: Yes. All substitute parts listed (ISO35DWR, MAX14945, MAX14948, MAX14949 series) are ROHS3 compliant and REACH unaffected, matching the compliance status of the original ISO35DWG4.
Q: What is the moisture sensitivity difference between the original part and substitutes?
A: ISO35DWG4 has MSL 2 rating (1 year shelf life). All Analog Devices substitutes (MAX14945, MAX14948, MAX14949 series) have MSL 1 rating (unlimited shelf life), providing superior moisture handling and extended storage capability.
Q: Can the supply voltage range difference affect compatibility?
A: The original ISO35DWG4 operates at 3.15V to 3.6V. MAX14945 and MAX14948 series support 1.71V to 5.5V and 4.5V to 5.5V ranges, providing broader supply voltage compatibility. MAX14949 series supports 3V to 5.5V and 4.5V to 5.5V ranges. Verify that the application supply voltage falls within the selected substitute's operating range.
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