https://e2e.ti.com/support/isolation-group/isolation/<p style="display:none;">blank</p>en-USTelligent Community 13https://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1661187/isow6441-high-frequency-noise-and-interference-on-low-frequency-lines/6407804Tue, 07 Jul 2026 16:10:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:fa4045e4-8263-4640-9686-d6aa71698341Varun KumarHi Dundukov, Looks like the Images you tried to share above have not been uploaded properly. Regards Varunhttps://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1662021/iso7763-q1-damaged-inputsTue, 07 Jul 2026 14:58:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:8b511ebf-4610-4648-a247-4abbb4284ea2Igor OrlovichPart Number: ISO7763-Q1 Is there a spec for the maximum current the input diode structures can handle? Seeing some parts fail despite having sizeable series resistance on the inputs. During shutdown for a 100ms or so the input on the secondary side is around 0.5V while the power rail is off, but the current into the pin is in 70-150uA range at most. Despite that the pin ends up shorted to ground. Secondly, is there way to get a quick design review to rule out any possible issues causing this?Industrial AutomationISO7763-Q1https://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1661040/iso1044-iso1044-high-voltage-test-method/6407382Tue, 07 Jul 2026 11:55:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:d3d51c38-a579-4936-a4a9-3c2582203b9eVarun KumarHi Rain, The VISO is stressed across isolation barrier. Hence, as long as the 3KV is applied between GND1 and GND2 of ISO1044, the test is valid. However - Please know that each and every device is production tested for VISO as per UL standard and is mentioned in datasheet as well. So, I&#39;m not sure why you have to test it again. Regards Varunhttps://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1661922/iso7842-matching-maximum-impulse-voltage-power-supplyTue, 07 Jul 2026 11:53:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:d2c686e1-268f-4289-bdd1-2c567426d5c4Roosbel GuayaPart Number: ISO7842 Other Parts Discussed in Thread: ISO7742TB-Q1 , ISOW7742-Q1 Hi: The ISO7842 has a creepage distance in the DWW format of 14.5mm and a Maximum impulse voltage of 9.8kV in air. Is there a matching isolated power supply for this digital isolator? I am interested in the Maximum impulse voltage, it just fits my needs. And the DWW format makes it easier to make a slit big enough so that the PCB is not the problem. The other isolators that i have seen like the: ISO7742TB-Q1: Maximum impulse voltage 8kV ISOW7742-Q1: I would prefer to use the ISOW7742-Q1 but it does not seem to meet my requirement of a 1.5/50us waveform of 9.8kV in air (PCB slit). Can you please guide me to a matching isolated dc/dc power supply? R.ISO7742TB-Q1ISOW7742-Q1iso7842Test &amp; Measurementhttps://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1661341/ucc33420-ucc33420-failure-during-iec-61000-4-2-esd-testing-8-kv-air-discharge/6407297Tue, 07 Jul 2026 10:40:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:294ca2f6-95df-4c0b-9fbb-afda7325a2dcPrateek VermaHi Zbigniew , Pls find the inputs below: The device incorporates chip-level improvements for system robustness, but its on-chip ESD clamps (HBM &#177;2kV, CDM &#177;750V) are for manufacturing protection only — not system-level IEC 61000-4-2 immunity. An 8 kV air discharge on the secondary side injects common-mode transient current through the isolation capacitance of the integrated transformer, which can overstress the VCC/GNDS pins if no external clamping is present. The datasheet explicitly acknowledges sensitivity to IEC 61000-4-x disturbances in harsh industrial environments. Follow these Layout Guidelines for ESD robustness : make sure that each guidelines is followed. Adding a TVS + CMC at the secondary connector entry point before the ESD energy reaches VCC is the most direct mitigation technique that could be used. We do not have any specific documents /App note for IEC 61000-4-2 pass/fail test results for this device&#39;s EVM (UCC33420EVM). But I have provided links to general system -Level ESD protection Guide documents below. Add a common-mode choke on the secondary output to block CM transient propagation toward VCC I didn&#39;t see any specific ESD related issue with this device. But most common solution would be to use TVS diode and CMC. See below application note on ESD Protection :- 1. System-Level ESD Protection Guide 2. IEC 61000-4-x Tests for TI’s Protection Devices 3. ESD Fundamentals Part 2: IEC 61000-4-2 Rating TI’s TPD1E1B04 , for example, has an IEC 61000-4-2 rating of 30kV/30kV Thanks, Prateekhttps://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1661491/iso1211-input-voltage-range/6407018Tue, 07 Jul 2026 07:05:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:c5b2550f-fd71-4cdd-a297-cc9a813902c9Varun KumarHi Marvin, Thanks for the inputs. Yes, you&#39;re right about the -60V interpretation but the minimum voltage but the minimum input voltage for which the device can detect a HIGH is close to 9V (that too with RTHR=0Ohm), hence the 5V is not supported by the device. This is also mentioned in datasheet as VIH specification: If customer is using this device for the first time, then I request you to refer following section in datasheet to understand the external component dependency on Voltage thresholds: 8.2.1.1 Design Requirements 8.2.1.2 Detailed Design Procedure Let us know if there&#39;s are any further questions after going through the datasheet sections Regards Varunhttps://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1657132/lmz10505-details-submission---u66-fa-request-pn--53501974-1-car-aco20253161-01/6406993Tue, 07 Jul 2026 06:50:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:258fe1fe-bcdb-45aa-8471-720dd26ca346Andreas MuellerHello Fatin, thanks for providing the Gerber data, but I&#39;m not able to identify the location and involved components of the LMZ10505. Please help to mark it or to extract the relevant sub-section of the layout. Best regards, Andreas.https://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1661187/isow6441-high-frequency-noise-and-interference-on-low-frequency-lines/6406986Tue, 07 Jul 2026 06:46:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:eb1e906c-adec-4c95-b62e-acaab32be183Yevgeniy DundukovI didn&#39;t take screenshots of the waveforms, but I can do so tomorrow.https://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1660849/iso6763-request-for-maximum-input-clamp-current-rating-for-iso6763f-iso6721f-and-iso1640/6406981Tue, 07 Jul 2026 06:41:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:bc999d0c-5a1d-46d3-9343-65e2f5e138ebVarun KumarHi Sang-il, Thank you for your trust in TI Regards Varunhttps://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1660190/tps2663-about-reverse-polarity-protection/6406973Tue, 07 Jul 2026 06:39:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:2dabd53d-01b9-4bef-a659-64645cd94063Bandaru HemanthHi, Sorry for the confusion it&#39;s my bad, Placing UVLO ladder after NFET would create extra complication that is not recommended at all , i had a discussion with my design folks. 1) &gt;300k ohm will solve this issue, if you keep in Mega ohm, it is much more helpful &amp; if you have a BOM you can also use Schottky diode. 2) current R_1 = 750 kΩ still results in a -0.557V, as long as the ladder current is in uA it won&#39;t create any latch up issues. thanks, Hemanthhttps://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1660190/tps2663-about-reverse-polarity-protection/6406953Tue, 07 Jul 2026 06:23:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:185b6b55-f7b8-405f-8e2d-ad91df54ca23Bandaru HemanthI will get back to you by the end of today. thanks, Hemanthhttps://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1661187/isow6441-high-frequency-noise-and-interference-on-low-frequency-lines/6406888Tue, 07 Jul 2026 05:40:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:8bec517b-52bf-46e9-b091-f6c670d9376dVarun KumarHi John, Thanks for reaching out. The schematic and PCB links shared above are blocked by our internal security team, hence unable to review it. Can you please share those directly here? - If you&#39;re unable to share publicly, then let&#39;s connect privately over chat (Sent you the request as well). Also, please do share the waveforms clearly showcasing the noise you&#39;ve mentioned above so that we can better understand the nature of the problem here. We need these inputs before jumping into any conclusion and providing further analysis and debug steps. Let us know. Regards Varunhttps://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1657132/lmz10505-details-submission---u66-fa-request-pn--53501974-1-car-aco20253161-01/6406876Tue, 07 Jul 2026 05:35:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:48963e5b-f81a-45fd-b12b-47c902022ce1Fatin NadzirahHi Andreas, Thank you for the assistance. Kindly refer to the attachment for the PCB layout. e2e.ti.com/.../69000997-Gerber-Layer--_2800_1_2900_.docx Additionally, regarding the inquiry- How is the EN signal generated? Kindly refer the response below; Refer to our schematic and measurement the source for +5VDC that similar both pin 1 (VIN) with pin 2 (EN) Generate/provide by external power supply CCA PN: 69000996-012 was standby for +5VDC.https://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1661040/iso1044-iso1044-high-voltage-test-method/6406748Tue, 07 Jul 2026 03:56:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:040006f5-9bd7-4bd7-9b66-0c04da2261d2Rain Wanghi Please help confirm if our following testing methods are OK spec:AC 3KV 60shttps://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1660849/iso6763-request-for-maximum-input-clamp-current-rating-for-iso6763f-iso6721f-and-iso1640/6406654Tue, 07 Jul 2026 02:24:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:6dba9039-3992-44c6-9832-edfc72764943Sang-il NamHi Varun Kumar, Thank you for your detailed response. I reviewed the ISO64xx series you suggested. Unlike the ISO67xx series, it does not have a diode connecting the input terminal directly to the power supply. Although the absolute maximum rating in the datasheet is similarly expressed as &quot;VCCx + 0.5 V,&quot; an additional footnote specifies that it is acceptable as long as it does not exceed 6V. Therefore, if the sole purpose is to prevent device damage—setting aside normal operation during such conditions—I believe this is an excellent solution. As for the ISO1640, I noticed from the datasheet that it is a newer device improved to support hot-swap, unlike the legacy ISO1540. I think it will work well provided that we can limit the line current to an appropriate level. Currently, an immediate replacement is difficult due to low stock and purchase limits for the ISO64xx on the TI store. However, once sufficient inventory becomes available, I think we will use the combination of the ISO64xx series and ISO1640, especially since they are package and pin-compatible. Thank you again for your thorough support. Best regards, Sang-ilhttps://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1660849/iso6763-request-for-maximum-input-clamp-current-rating-for-iso6763f-iso6721f-and-iso1640/6405964Mon, 06 Jul 2026 16:41:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:07b6138d-7bbd-4619-b95b-a9ce2f41a2e9Varun KumarHi Sang-il, Thanks for the additional details on the requirement. Please find my inputs below: [quote userid=&quot;4067&quot; url=&quot;~/support/isolation-group/isolation/f/isolation-forum/1660849/iso6763-request-for-maximum-input-clamp-current-rating-for-iso6763f-iso6721f-and-iso1640/6404891&quot;]there can be cases where an external target with its power (3.3 V) live is connected to my device while my device is unpowered.[/quote] First of all, this itself is a complete violation on Absolute Maximum Ratings as per datasheet and we do not recommend such a system design which can affect the long-term reliability of the device. There&#39;s no conservative guideline in a such of abs max breaching of the device. Hence, this needs to be addressed in the system such that INx does not get stressed beyond abs max ratings. However, for the ISO67XX digital isolator, we do have an alternate solution which addresses this situation exactly and can be used a drop-in - Our latest generation digital isolator ISO64XX which has the overvoltage tolerant inputs - ISO6463F - I SO6463 data sheet, product information and support | TI.com ISO6421F - ISO6421 data sheet, product information and support | TI.com Please refer these FAQ and app notes on Overvoltage Tolerant Inputs enables by ISO64XX device for your reference - Protecting Your Digital Isolator Using Overvoltage Tolerant Inputs (+) [FAQ] ISO6441: What are overvoltage tolerant inputs of digital isolators? - Isolation forum - Isolation - TI E2E support forums For ISO1640, this feature is not available, and the abs max violation situation needs to be fixed at the system level by disabling the INx input signal in the unpowered state. Regards Varunhttps://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1657554/iso1042dwevm-iso1042-q1-can-failure/6405966Mon, 06 Jul 2026 16:41:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:81a3acfa-1843-4c27-90aa-7e8e59086581Varun KumarHi Sankaran, Apologies for the delay here as I was out last week. Please find my inputs below based on the document and description shared above: First observation that I want to highlight before moving forward - Please add a bulk capacitor of 10uF on VCC2 in addition to existing 0.1uF, it&#39;s essential for device&#39;s optimal performance -&gt; Do let us know if this helps instantly. We do not expect any such failures ISO1042 as there is no known issue with the device which can be shared as the root cause, in fact ISO1042 is one of the most robust ISO+CAN device out in the market - hence, this particular needs to be debugged step by step. Now, Some Questions for clarification for better understanding of the issue and connections: When you say failure event of both the CAN devices - does this failure occur immediately after power up or does this signature appears only after some particular stress or sequence of TXD pattern on U201(CAN0) and U202(CAN1)? This is important to understand what exactly led to this failure. CAN0 and CAN1 bus lines are not connected at all in the system? A system level block diagram would be useful in understanding the CAN bus connection along with the termination resistors installed. I see that CAN0 does not have any termination resistor populated in schematics - without termination resistor, there cannot be any communication. Kindly help us understand the system and failure better for this resolve and do try the bulk capacitor experiment as mentioned above. Also, in order to validate the proper functioning of failing device - please populate them on ISO1042DWEVM and check functionality of the devices. This is the quickest way debug and isolate the issue. Regards Varunhttps://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1661338/iso1211-input-voltage-range/6405933Mon, 06 Jul 2026 16:22:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:7f5b9a43-0bab-4fda-9728-4993f3cd8e2dVarun KumarHi Vignesh, This seems to be duplicated again here (+) ISO1211: Input voltage range - Isolation forum - Isolation - TI E2E support forums Will address it in a single place. Regards Varunhttps://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1661040/iso1044-iso1044-high-voltage-test-method/6405907Mon, 06 Jul 2026 16:10:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:07178e6a-352b-41af-98fc-9f8db562174eVarun KumarHi Rain, [quote userid=&quot;605816&quot; url=&quot;~/support/isolation-group/isolation/f/isolation-forum/1661040/iso1044-iso1044-high-voltage-test-method/6404499&quot;]The High Voltage Specifications are already mentioned in the datasheet under section 6.6 Insulation Specifications as VISO which is 3kVrms for ISO1044.[/quote] Please look in the Insulation Specifications in the datasheet as mentioned above already. Regards Varunhttps://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1661491/iso1211-input-voltage-rangeMon, 06 Jul 2026 12:19:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:33e49c8c-a3b2-4a4a-ad21-efb3f368f632Marvn ArcangelPart Number: ISO1211 Hi Experts, I have a question about the VINx, VSENSEx voltage range. The datasheet mentioned that the input accepts 24V-60V: However, the recommended operating conditions states that the VINx, VSENSEx can be from -60V to 60V: I understand that the -60V is for reverse voltage protection, however, does this also meant that I can use input range of 5V-30V? or the minimum should still be 24V? Thanks and regards, MarvinISO1211