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ISO7420FCCDR Digital Isolator Equivalent & Substitute Parts
Part Overview
The ISO7420FCCDR is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage, 2 channels, and 50Mbps data rate in an 8-SOIC package. This capacitive coupling isolator is designed for applications requiring high-speed signal isolation with low propagation delay. The part is currently active and in production, with 4200 units in stock. Substitute parts are identified based on matching isolation voltage, channel configuration, package type, and supply voltage specifications, with consideration for data rate and timing characteristics that may affect system performance.
Substiute Parts
Key Parameters
| Parameter | ISO7420FCCDR |
|---|---|
| Manufacturer | Texas Instruments |
| Technology | Capacitive Coupling |
| Isolation Voltage | 2500Vrms |
| Number of Channels | 2 |
| Channel Configuration (Inputs - Side 1/Side 2) | 2/0 |
| Data Rate | 50Mbps |
| Common Mode Transient Immunity (Min) | 25kV/µs |
| Propagation Delay tpLH / tpHL (Max) | 37ns / 37ns |
| Pulse Width Distortion (Max) | 5ns |
| Supply Voltage | 2.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitute parts are grouped based on the following critical parameters that determine functional compatibility:
Primary Matching Criteria:
- Isolation voltage: 2500Vrms (mandatory match)
- Number of channels: 2 (mandatory match)
- Package type: 8-SOIC (mandatory match)
- Supply voltage range: 2.7V ~ 5.5V (mandatory match)
- Common Mode Transient Immunity: 25kV/µs (mandatory match)
- Channel configuration: 2/0 (unidirectional, 2 inputs on Side 1, 0 on Side 2)
Secondary Considerations:
- Data rate: Substitutes may have lower data rates (1Mbps, 10Mbps, 25Mbps) than the primary part (50Mbps)
- Propagation delay: Substitutes may have higher propagation delays
- Technology: Substitutes use magnetic coupling (iCoupler®) instead of capacitive coupling
- Operating temperature: Some substitutes have reduced upper temperature limit (-40°C ~ 105°C vs. -40°C ~ 125°C)
- Packaging format: Available in Tube or Cut Tape (CT) & Digi-Reel® options
The ADUM1200 and ADUM1201 series from Analog Devices Inc. meet all primary matching criteria. ADUM1200 variants maintain the 2/0 channel configuration, while ADUM1201 variants feature 1/1 channel configuration and are therefore not direct substitutes for the ISO7420FCCDR.
Parameter Comparison
| Parameter | ISO7420FCCDR | ADUM1200ARZ | ADUM1200ARZ-RL7 | ADUM1200BRZ | ADUM1200BRZ-RL7 | ADUM1200CRZ | ADUM1200CRZ-RL7 |
|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. |
| Isolation Voltage | 2500Vrms | 2500Vrms | 2500Vrms | 2500Vrms | 2500Vrms | 2500Vrms | 2500Vrms |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Channel Configuration (Inputs - Side 1/Side 2) | 2/0 | 2/0 | 2/0 | 2/0 | 2/0 | 2/0 | 2/0 |
| Data Rate | 50Mbps | 1Mbps | 1Mbps | 10Mbps | 10Mbps | 25Mbps | 25Mbps |
| Common Mode Transient Immunity (Min) | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs | 25kV/µs |
| Propagation Delay tpLH / tpHL (Max) | 37ns / 37ns | 150ns / 150ns | 150ns / 150ns | 50ns / 50ns | 50ns / 50ns | 45ns / 45ns | 45ns / 45ns |
| Pulse Width Distortion (Max) | 5ns | 40ns | 40ns | 3ns | 3ns | 3ns | 3ns |
| Supply Voltage | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 105°C | -40°C ~ 105°C | -40°C ~ 105°C | -40°C ~ 105°C | -40°C ~ 105°C | -40°C ~ 105°C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | 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 |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Packaging Format | Tape & Reel (TR) | Tube | Cut Tape (CT) & Digi-Reel® | Tube | Cut Tape (CT) & Digi-Reel® | Tube | Cut Tape (CT) & Digi-Reel® |
Engineering Selection Recommendations
All listed substitute parts are active products with ROHS3 compliance and REACH unaffected status, matching the regulatory compliance profile of the ISO7420FCCDR.
For applications requiring 50Mbps data rate: The ISO7420FCCDR is the only option among the listed parts. No direct substitute with equivalent 50Mbps performance is available in the provided substitute list.
For applications with lower data rate requirements (≤25Mbps): The ADUM1200CRZ and ADUM1200CRZ-RL7 provide the closest timing performance to the ISO7420FCCDR with 25Mbps data rate, 45ns propagation delay, and 3ns pulse width distortion. These parts are suitable for applications where 25Mbps bandwidth is sufficient.
For applications with minimal timing constraints (≤10Mbps): The ADUM1200BRZ and ADUM1200BRZ-RL7 offer 10Mbps data rate with acceptable propagation delay of 50ns.
For low-speed applications (≤1Mbps): The ADUM1200ARZ and ADUM1200ARZ-RL7 are suitable, though they exhibit higher propagation delay of 150ns.
Packaging considerations: Cut Tape (CT) & Digi-Reel® variants (RL7 suffix) provide higher inventory availability. Tube packaging is available for lower-volume requirements.
Temperature range limitation: All ADUM1200 substitutes operate to -40°C ~ 105°C, compared to the ISO7420FCCDR's -40°C ~ 125°C. Applications requiring operation above 105°C cannot use these substitutes.
Moisture sensitivity: ADUM1200 series parts feature MSL 1 (Unlimited) compared to ISO7420FCCDR's MSL 2 (1 Year), providing superior moisture handling characteristics.
Frequently Asked Questions (FAQ)
Q: Can ADUM1200 series parts directly replace the ISO7420FCCDR in all applications?
A: Direct replacement is possible only if the application data rate requirement does not exceed 25Mbps. The ISO7420FCCDR operates at 50Mbps, which is not matched by any substitute in the provided list. Additionally, the operating temperature range differs: ADUM1200 series is limited to -40°C ~ 105°C versus ISO7420FCCDR's -40°C ~ 125°C.
Q: What is the key difference between ADUM1200 variants (A, B, C)?
A: The variants differ in data rate and associated timing specifications. ADUM1200A operates at 1Mbps with 150ns propagation delay, ADUM1200B at 10Mbps with 50ns propagation delay, and ADUM1200C at 25Mbps with 45ns propagation delay. Selection depends on the required bandwidth for the application.
Q: Are the packaging format differences (Tube vs. Cut Tape & Digi-Reel) functionally significant?
A: No. Packaging format differences are logistical only. Tube and Cut Tape (CT) & Digi-Reel® variants of the same part number (e.g., ADUM1200CRZ vs. ADUM1200CRZ-RL7) are electrically and functionally identical. Selection is based on inventory requirements and supply chain preferences.
Q: What does the RL7 suffix indicate?
A: The RL7 suffix designates Cut Tape (CT) & Digi-Reel® packaging format. Parts with this suffix are supplied on tape and reel, typically offering higher inventory availability compared to Tube packaging.
Q: How does the technology difference (Capacitive vs. Magnetic Coupling) affect substitution?
A: The ISO7420FCCDR uses capacitive coupling technology, while ADUM1200 series uses magnetic coupling (iCoupler®). Both technologies achieve the same 2500Vrms isolation voltage and 25kV/µs CMTI specification. The primary functional difference is in data rate capability and propagation delay characteristics, which are explicitly listed in the parameter comparison table.
Q: Can ADUM1201 series parts substitute for the ISO7420FCCDR?
A: No. ADUM1201 series parts feature 1/1 channel configuration (one input on Side 1, one input on Side 2), whereas the ISO7420FCCDR requires 2/0 configuration (two inputs on Side 1, zero on Side 2). Channel configuration is a mandatory matching criterion for functional compatibility.
Q: What is the significance of the MSL (Moisture Sensitivity Level) difference?
A: ADUM1200 series parts have MSL 1 (Unlimited shelf life), while ISO7420FCCDR has MSL 2 (1 Year shelf life). This means ADUM1200 parts can be stored indefinitely without baking, whereas ISO7420FCCDR parts require baking if stored beyond one year. This is relevant for long-term inventory management but does not affect functional performance in the application.
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