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ISO7842DWR
Texas Instruments
DGTL ISO 5700VRMS 4CH GP 16SOIC
1444 Pcs New Original In Stock
General Purpose Digital Isolator 5700Vrms 4 Channel 100Mbps 100kV/µs CMTI 16-SOIC (0.295", 7.50mm Width)
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5.0 / 5.0
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ISO7842DWR
Product Overview
1307972
DiGi Electronics Part Number
ISO7842DWR-DGManufacturer
Texas Instruments
ISO7842DWR
Description
DGTL ISO 5700VRMS 4CH GP 16SOICInventory
1444 Pcs New Original In Stock
General Purpose Digital Isolator 5700Vrms 4 Channel 100Mbps 100kV/µs CMTI 16-SOIC (0.295", 7.50mm Width)
Quantity
Minimum 1
Minimum 1
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ISO7842DWR 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
4
Inputs - Side 1/Side 2
2/2
Channel Type
Unidirectional
Voltage - Isolation
5700Vrms
Common Mode Transient Immunity (Min)
100kV/µs
Data Rate
100Mbps
Propagation Delay tpLH / tpHL (Max)
16ns, 16ns
Pulse Width Distortion (Max)
4.1ns
Rise / Fall Time (Typ)
1.7ns, 1.9ns
Voltage - Supply
2.25V ~ 5.5V
Operating Temperature
-55°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (0.295", 7.50mm Width)
Supplier Device Package
16-SOIC
Base Product Number
ISO7842
Datasheet & Documents
Manufacturer Product Page
ISO7842DWR Specifications
HTML Datasheet
ISO7842DWR-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-40144-6
-296-40144-1-DG
296-40144-1
296-40144-2
ISO7842DWR-DG
Standard Package
2,000
Alternative Parts
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Frequently Asked Questions (FAQ)
When designing with the ISO7842DWR for a motor drive or industrial inverter, what specific layout techniques are critical to achieve the rated 100kV/µs Common Mode Transient Immunity (CMTI) and avoid data corruption?
The ISO7842DWR’s 100kV/µs CMTI is a system-level specification that depends heavily on PCB layout. To achieve this, you must minimize parasitic capacitance across the isolation barrier. Place a solid ground plane on each side (GND1 and GND2) but ensure no overlap or power plane extends under the device, as this creates a capacitor that shunts common-mode noise. Use a slot or moat under the device to separate the planes completely. Additionally, place 0.1µF and 1µF decoupling capacitors within 1mm of each VCC pin (pins 1 and 16) with low-impedance vias directly to their respective ground planes. This minimizes the loop area and ensures the high-frequency transient energy is locally bypassed, preventing latch-up or bit errors during high-voltage switching events.
For a 24V PLC backplane replacement, can I directly swap the ISO7842DWR for the older ISO7221M or the competitor’s Si8622EC-B-ISR, and what power sequencing or input threshold differences should I watch for?
While the ISO7842DWR offers higher isolation (5.7kVrms vs 2.5kVrms) and four channels, a direct swap requires careful attention. Unlike the ISO7221M which has a default logic high state on inputs with floating pins, the ISO7842DWR’s default output state is determined by the EN pin; if unused inputs float, they can cause oscillation. More critically, when replacing a competitor’s Si8622 (which uses a 2.25-5.5V supply but has different input thresholds), the ISO7842DWR is a capacitive isolator with Schmitt trigger inputs. It requires clean edges. For power sequencing, the ISO7842DWR does not require strict sequencing but ensure that if VCC1 is powered without VCC2, the outputs on side 2 will remain in a high-impedance or default state (depending on EN pins). Always tie unused input pins to GND or VCC via a 10kΩ resistor to prevent noise-induced toggling, a step often omitted in older designs.
In a battery management system (BMS) operating from -40°C to +105°C, does the ISO7842DWR maintain its 100Mbps data rate and 4.1ns pulse width distortion across the entire temperature range, or are there derating factors for timing parameters?
The ISO7842DWR is specified from -55°C to 125°C, making it suitable for automotive-grade BMS. Critical timing parameters like propagation delay (16ns max) and pulse width distortion (4.1ns max) are guaranteed across the full temperature range and supply voltage variation (2.25V to 5.5V) without derating. However, the 100Mbps data rate is achievable only when the input signal rise/fall times are ≤ 2ns and the duty cycle distortion is managed. At extreme temperatures, the typical rise/fall times (1.7ns/1.9ns) may shift slightly, but they remain within limits that support NRZ data up to 100Mbps. For reliable operation near the maximum data rate, ensure that your controller’s output driver can provide a minimum of 2ns edge rates and that trace capacitance on the input pins is kept below 15pF to avoid RC filtering that could degrade the effective data rate.
I need to replace the ISO7842DWR with a pin-compatible option due to supply chain constraints. What are the key second-source considerations regarding isolation voltage, channel configuration, and enable pin logic compared to parts like the ADuM140N or Si8642ED?
When second-sourcing the ISO7842DWR (16-SOIC wide body), consider that competitor alternatives like the ADuM140N (Analog Devices) and Si8642ED (Skyworks) are pin-compatible but have critical differences. First, the ISO7842DWR has 2/2 channel direction (two in, two out) with a 5.7kVrms rating. The ADuM140N offers a 5.7kVrms option but typically has a 2/2 configuration with different enable logic (active high vs. active low). The Si8642ED is often 2/2 but check its isolation rating (5.0kVrms typical). Most importantly, the ISO7842DWR’s enable pins (EN1 and EN2) have internal pull-downs; if your design relies on a floating enable for high impedance, verify the competitor’s internal pull direction—mismatch could cause unintended output disabling. Additionally, the CMTI of 100kV/µs for the ISO7842DWR is superior to many older isolators (often 50kV/µs); substituting with a lower CMTI part in a high-noise environment may require additional filtering or risk data corruption. Always validate the default output state (high or low) under power-up conditions, as this varies significantly among suppliers.
For a high-reliability medical device requiring reinforced insulation per IEC 60601-1, does the ISO7842DWR’s 5700Vrms isolation voltage qualify it for a 250Vrms working voltage with a single device, and what creepage and clearance distances must the PCB meet to maintain certification?
Yes, the ISO7842DWR is certified for reinforced insulation up to 800V peak (or 5700Vrms test) per VDE and UL, making it suitable for 250Vrms mains applications in medical equipment. However, to maintain the reinforced rating, the PCB design must adhere to specific creepage and clearance distances. In the 16-SOIC wide-body package (7.5mm body width), the minimum creepage required for reinforced insulation at 250Vrms (pollution degree 2) is typically 8mm. This part’s package provides a creepage distance of 8mm or more between pins on opposite sides. You must ensure no solder mask openings, traces, or conductive debris bridge this distance. Additionally, if conformal coating is applied, it does not reduce the required creepage per safety standards; it only serves as a protective layer. To pass the partial discharge test (required for reinforced insulation), ensure that no high-voltage traces run under or across the device's isolation barrier on internal PCB layers.
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ISO7842DWR CAD Models
Texas Instruments ISO7842DWR PCB symbols & footprints
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