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ISO7420FEDR
Texas Instruments
DGTL ISO 2500VRMS 2CH GP 8SOIC
19503 Pcs New Original In Stock
General Purpose Digital Isolator 2500Vrms 2 Channel 50Mbps 25kV/µs CMTI 8-SOIC (0.154", 3.90mm Width)
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ISO7420FEDR
Product Overview
1278816
DiGi Electronics Part Number
ISO7420FEDR-DGManufacturer
Texas Instruments
ISO7420FEDR
Description
DGTL ISO 2500VRMS 2CH GP 8SOICInventory
19503 Pcs New Original In Stock
General Purpose Digital Isolator 2500Vrms 2 Channel 50Mbps 25kV/µs CMTI 8-SOIC (0.154", 3.90mm Width)
Quantity
Minimum 1
Minimum 1
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ISO7420FEDR Technical Specifications
Category
Digital Isolators
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Active
Technology
Capacitive Coupling
Type
General Purpose
Isolated Power
No
Number of Channels
2
Inputs - Side 1/Side 2
2/0
Channel Type
Unidirectional
Voltage - Isolation
2500Vrms
Common Mode Transient Immunity (Min)
25kV/µs
Data Rate
50Mbps
Propagation Delay tpLH / tpHL (Max)
11ns, 11ns
Pulse Width Distortion (Max)
3ns
Rise / Fall Time (Typ)
1.8ns, 1.7ns
Voltage - Supply
3V ~ 5.5V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Supplier Device Package
8-SOIC
Base Product Number
ISO7420
Datasheet & Documents
Manufacturer Product Page
ISO7420FEDR Specifications
HTML Datasheet
ISO7420FEDR-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
TEXTISISO7420FEDR
296-28742-6
2156-ISO7420FEDR
296-28742-2
296-28742-1
Standard Package
2,500
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
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5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
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Dec 02, 2025
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Dec 02, 2025
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Dec 02, 2025
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Frequently Asked Questions (FAQ)
Can the ISO7420FEDR be safely used in a 48V industrial bus system with high ground potential differences, and what isolation margin should I design for beyond its 2500Vrms rating?
The ISO7420FEDR is rated for 2500Vrms isolation, which is suitable for reinforced isolation in many industrial applications, including 48V systems. However, in environments with sustained ground potential differences or transient overvoltages (e.g., due to lightning or motor switching), you should apply a safety derating factor of at least 2x. Design for a maximum continuous working voltage below 1250Vrms and include additional transient protection (e.g., TVS diodes) on both sides. The 25kV/µs CMTI ensures robustness against fast common-mode transients, but long-term reliability depends on proper PCB creepage (≥8mm recommended) and avoiding moisture ingress in high-humidity environments.
I'm replacing an ADuM1201ARZ in a 3.3V UART link—will the ISO7420FEDR work as a drop-in replacement, and what layout changes are needed?
The ISO7420FEDR can functionally replace the ADuM1201ARZ in a 3.3V UART application since both are 2-channel digital isolators with similar propagation delays and voltage ranges. However, the ISO7420FEDR uses capacitive isolation (vs. magnetic in ADuM1201), so ensure your layout minimizes capacitive coupling between input and output sides. Increase spacing between primary and secondary side traces to >4mm, avoid overlapping power/ground planes across the isolation barrier, and use a split ground plane with a 2–3mm gap under the package. Also, verify signal polarity—the ISO7420FEDR has non-inverting channels, while the ADuM1201 may have different default states; confirm logic levels during power-up.
What are the risks of using the ISO7420FEDR in a high-speed SPI daisy-chain configuration running at 40 Mbps, and how can I mitigate signal integrity issues?
While the ISO7420FEDR supports up to 50Mbps, using it in a 40Mbps SPI daisy-chain introduces risks due to cumulative propagation delay (11ns max per channel) and pulse width distortion (3ns max). In multi-device chains, these delays can cause clock-to-data skew, violating setup/hold times. To mitigate, minimize trace lengths on the isolated side, use impedance-controlled routing (50Ω typical), and avoid vias near the isolator. Consider buffering the clock line or using source-synchronous signaling. Also, ensure both sides share a common ground reference at the system level—even though isolated—to reduce ground bounce. Test eye diagrams under worst-case temperature (-40°C and 125°C) to validate margin.
Is the ISO7420FEDR suitable for automotive 12V battery monitoring systems, and does it meet AEC-Q100 requirements?
The ISO7420FEDR is not AEC-Q100 qualified and therefore not recommended for direct use in automotive battery monitoring systems where functional safety or compliance with automotive reliability standards is required. Although it operates over -40°C to 125°C and has strong CMTI (25kV/µs), automotive designs typically demand components with documented failure rates, extended reliability testing, and traceability. For such applications, consider TI’s ISO7741FDW (AEC-Q100 Grade 1 qualified) instead. If using the ISO7420FEDR in non-safety-critical automotive subsystems (e.g., infotainment), ensure full environmental and EMC validation, and implement redundancy or monitoring circuits to compensate for lack of qualification.
How does the ISO7420FEDR handle power sequencing when one side powers up before the other, and could this cause latch-up or incorrect logic states?
The ISO7420FEDR lacks isolated power outputs, so both sides must be externally powered. If one side (e.g., secondary) powers up before the primary, undefined input states may propagate, causing glitches or temporary miscommunication. While the device is not prone to latch-up due to its CMOS design and MSL-1 rating, improper power sequencing can lead to metastability in downstream logic. To prevent this, implement a power-good signal or supervisor IC to delay enable signals until both supplies are stable. Alternatively, use pull-up/down resistors on unused inputs and ensure firmware initializes communication only after both sides are powered. Always follow TI’s recommended power-up sequence: apply and stabilize VCC1 and VCC2 within 100ms of each other.
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ISO7420FEDR CAD Models
Texas Instruments ISO7420FEDR PCB symbols & footprints
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