Isolation forum - Recent Threads

ISOUSB211-Q1: Design Review

Sri Krishna V — Tue, 16 Jun 2026 16:40:10 GMT

Part Number: ISOUSB211-Q1
Other Parts Discussed in Thread: ISOUSB211,

I am using ISOUSB211 not ISOUSB211-Q1 as it is not yet avaliable for purchse.

Can you help us review the schematic ISO USB.pdf

TIDA-01604: TIDA-01604 Parallel Diode Bridge

Noah Martin — Tue, 16 Jun 2026 15:02:26 GMT

Part Number: TIDA-01604
Other Parts Discussed in Thread: LMG3522R030-Q1

Hi,

We are developing a 2kW 120VAC/240VAC Totem Pole single phase and we see that you have some diodes that are prior to the boost inductor. We have a couple of questions related to these. We are utilizing the LMG3522R030-Q1 GaN FET for our development.

Can you please comment on the purpose of D102? What is the purpose of these diodes? How do you rate them for the use case? What would happen if we did not utilize these diodes?

Thanks,

ISOW3080: Driver Functional Table Clarification

Julius Burtell — Tue, 16 Jun 2026 13:06:35 GMT

Part Number: ISOW3080

Hi team,

Quick clarification question from the prelim datasheet:

Table 8.2 calls out a Hi-Z state until VDD is present, which makes sense, but we have an invalid operational state when VDDL is not present.

Is there any more information available on what state the bus is in when VDDL is low? I see the note where it's indicated that IO inputs can cause indetermined output, but is there any information on the output state if only VDD is present, where VDDL, D and DE are both low? I assume that the output would be hi-Z but would like to confirm.

Thanks,

Julius

ISO7763-Q1: ISO7763FQDBQRQ1 Change in origin and manufacturing process

Stephen mo — Tue, 16 Jun 2026 08:11:21 GMT

Part Number: ISO7763-Q1

Does the change in production location and process indicated by the PCN affect the normal use?Looking forward to your reply. Thank you.

PCN20241218004.2.pdf

ISO7741TB-Q1: Can we swap D1 and D2 (Pin 1 and Pin 2)

SARANG GOKHE — Tue, 16 Jun 2026 06:19:04 GMT

Part Number: ISO7741TB-Q1

Can we swap Pin 1 (D1) and Pin 2 (D2) of ISO7741TBDWRQ1, is there any effect or malfunctioning occour due to swapping ?

ISO6462: ISO646x vs. ISO676x Isolation Technology

Timothy Burroughs — Mon, 15 Jun 2026 14:03:28 GMT

Part Number: ISO6462

Hello TI Isolation Team,

BLOOMY is evaluating the ISO676x and ISO646x families of six-channel digital isolators for a high-reliability, reinforced-insulated simulation instrument. We are analyzing the isolator- and system-level safety margins, and implementation differences between these two product families, regarding how their physical construction may impact long-term reliability and safety ratings.

In reviewing the datasheets, we noted a difference in how the isolation structures are described:

The ISO676x explicitly calls out a "double capacitive" silicon dioxide (SiO2) insulation barrier.
The ISO646x states that it uses "SiO2 as the isolation barrier," omitting the "double capacitive" phrasing.

While both families carry reinforced ratings at 1500Vrms working voltage, we’d like to understand any underlying structural differences ahead of going into system-level compliance certification.

Could a TI engineer clarify the following:

Voltage Rating: What would the equivalent continuous, reinforced DC working voltage be for both products (VDE)? BLOOMY is considering safe application up to at least 800VDC, continuous withstand.
Insulation Architecture: Does the ISO646x utilize a dual-die, double-sided series SiO2 capacitor construction (one capacitor on the transmitter die, one on the receiver die) identical to the ISO676x? Or does it utilize a single-layer/single-die SiO2 barrier topology?
System Safety: Does the "double capacitive" structure of the ISO676x provide greater fault tolerance (e.g., defect containment if one layer degrades) than the ISO646x? Are there specific transient-heavy or high-working-voltage applications where TI recommends one over the other for better long-term reliability?
VDE Certification: Do both families leverage the same lifetime acceleration and high-voltage breakdown reliability models to achieve their respective (planned) VDE reinforced statuses? And, does the ISO646x have a planned certification date?

Thank you.

ISO7221M: ISO7221MD and ISO7241CDW replacement

Andrew Schaefer — Mon, 15 Jun 2026 11:49:34 GMT

Part Number: ISO7221M

I am using the ISO7221MD and ISO7241CDW in my design and I am looking to replace them with the ISO7221MDR and ISO7241CDWR. What are the difference between the two parts, are they the same part?

ISO3086: Regarding 4M Changes of the Device

Kyohei — Mon, 15 Jun 2026 07:40:33 GMT

Part Number: ISO3086

Hi team,

Our customer is using this device in a mass-production model, and we have confirmed the 4M change based on the PCN notification issued in 2023.

With this 4M change, we observed a reduction of approximately 5 mA in current consumption when comparing device 1 to device 2. However, for IC 3, which is from the same lot as 2, we have observed a phenomenon where the current consumption is approximately 15 mA lower than that of 2.

Questions:

Although ICs 2 and 3 have different markings, can you confirm whether they are indeed from the same lot?
We are currently confirming the reel label information with the customer.
Is it possible to estimate the cause of the difference in current consumption based on package differences between 2 and 3?

Pre-PCN device

2. Post-PCN device (approx. 5 mA lower current consumption than (1))

3. Post-PCN device (approx. 15 mA lower current consumption than (2))

Best regards,

Kyohei

ISO1643: Similar alternate part for ISO1643DWR with VCCI =1.8V support

Sampat Kumar — Mon, 15 Jun 2026 07:08:14 GMT

Part Number: ISO1643
Other Parts Discussed in Thread: ISO6720, ISO1640

Hi Team,

We are looking for a part similar to the ISO1643DWR, with four channels, where two channels are used for the I²C signals (SCL and SDA) and the other two channels are used as GPIOs.

Our main requirement is that the VCCI side should support a 1.8 V logic supply. Kindly suggest a similar digital isolator that can support VCCI = 1.8 V and VCCB = 3.3 V.

Thank you,

ISO7763-Q1: The backside of the chip is different

Stephen mo — Mon, 15 Jun 2026 02:41:01 GMT

Part Number: ISO7763-Q1

For chips on the same reel, the back sides are different. Is this normal? Why did this situation occur? Looking forward to your reply. Thank you.

ISO7760-Q1: Strategic Manufacturing Partnership Inquiry – Siemens Production Programs

Tia Ngundin — Thu, 11 Jun 2026 15:21:17 GMT

Part Number: ISO7760-Q1

Hello Texas Instruments Team,

My name is Tia, and I am a Procurement Analyst with Divsys International (ICAPE Group).

We are currently supporting multiple Siemens production programs and are evaluating opportunities to establish direct manufacturer relationships for key semiconductor content used within these assemblies.

Before discussing specific part numbers, I would appreciate the opportunity to connect with the appropriate sales, account management, or strategic business development representative supporting OEM/EMS manufacturing programs.

Our objectives include:

Direct manufacturer engagement
Long-term supply chain support
Volume pricing opportunities
Forecast and demand planning collaboration
Product lifecycle and obsolescence visibility
Support for ongoing Siemens production requirements

These are active production programs with annual build volumes ranging from hundreds to thousands of assemblies, and we are looking to better understand how Texas Instruments can support us directly.

Please let me know the best point of contact to discuss these opportunities further.

Thank you for your time, and I look forward to hearing from you.

ISOW1050: no stock to order

Joe Sivaswamy — Thu, 11 Jun 2026 13:00:29 GMT

Part Number: ISOW1050
Other Parts Discussed in Thread: LM5169, ISOW3080,

We require small numbers of the ISOW3080 and ISOW1050 and the buck converter LM5169 for our new BMS design. Since there is no stock to order these parts, like to get few samples of each of these ICS.

Ship to:

9300 Bluegrass dr. Austin, Texas 78759, USA

ISO1042-Q1: Maximale Bestellmenge

Einkauf Einkauf — Wed, 10 Jun 2026 10:24:30 GMT

Part Number: ISO1042-Q1

Sehr geehrte Damen und Herren, vom o.g. Bauteil benötigen wri 1000 Stk., weshalb ich den kompletten Bestand von aktuell 975 Stk. bestellen möchte. Können Sie bitte einen Link ohne Mengenbeschränkung an mich senden, oder an die hinterlegte Adresse:

einkauf@fsm.ag

franziska.weisser@fsm.ag

Vielen Dank.

ISOM8110: flyback circuit ringing

Adam Torma — Tue, 09 Jun 2026 16:10:24 GMT

Part Number: ISOM8110

e2e,

I'm using ISOM8110DFHR as drop in replace traditional photo-coupler but the circuit is ringing. Do we need to make some adjustment on other components?

Topology=Flyback DC/DC

Vout=5V

Iout=20A (Full-Load)

fsw=200kHz

Case 1: parameterA using TLP293(GRL-TPL,

R29=15K

R31=470R

R32=5.1K

R27=2K

R28=5.6K

IC3=AZ431

IC2=5021

R8=330R

C9=0.1uF

Vout=Normal, no Ringing

Case2: parameterA using ISOM8110DFHR

R29=15K

R31=470R

R32=5.1K

R27=2K

R28=5.6K

IC3=AZ431

IC2=5021

R8=330R

C9=0.1uF

Vout=Normal @ Iout<4A, Ringing @ Iout>4A

Case3: parameterB using ISOM8110DFHR

R29=15K

R31=470R

R32=5.1K

R27=3K

R28=Open

IC3=AZ431

IC2 5021

R8=220R

C9=1uF

Vout=Normal @ Iout<7A, Ringing @ Iout>7A

Case4: parameterB using ISOM8110DFHR

R29=15K

R31=470R

R32=5.1K

R27=1K

R28=5.6K

IC3=AZ431

IC2 5021

R8=0R

C9=47pF

Vout=Normal @ Iout<0.4A, Ringing @ Iout>0.4A

Output Ringing Waveform:

White=Output Voltage(Case1) @Dynamic Load between Full-Load(20A) and No-Load(0A)

Yellow=Output Voltage(Case3)) @Fixed Load 7A

Yellow=Output Voltage(Case4) @Fixed Load 0.4A

Thank you,

Adam

ISOW1432: full-duplex

Jeff YANG — Tue, 09 Jun 2026 02:31:46 GMT

Part Number: ISOW1432

Hi,

We currently have a requirement for full-duplex RS485. Since this chip has two pairs of Tx and Rx, would it be feasible to use it? Thank you.

ISO35: I need an ISO35 in the -55°C to +125°C temperature range.

Tyler Marshall — Mon, 08 Jun 2026 21:35:46 GMT

Part Number: ISO35

I need an ISO35 in the -55°C to +125°C temperature range.

The ISO35 datasheet (attached) says that only the ISO35M is rated from -55°C to +125°C, but the Addendum-Page 1 (Package Options) says that the ISO35M is obsolete, and the ISO35DWR is rated from -55°C to +125°C (which contradicts the information earlier in the datasheet that says the "M" in the part number specifies the larger temperature range.

The ISO35 product page (www.ti.com/.../ISO35) says that the ISO35DWR is rated from -55°C to +125°C, and is the same part as the ISO35DWR.A (which is only rated for -40°C to +85°C).

Digi-Key only stocks the ISO35DWR, which it says is rated for -40°C to +85°C.

Is the -55°C to +125°C ISO35 still available? Digi-Key says it isn't, and the TI information in both the datasheet and the product website is contradictory... I don't see an answer in the forum.

-Tyler Marshall

iso15.pdf

AMC43XXDVVEVM-DOC-CERT: PSPICE simulation problem, current measurement problem

alex peng — Sun, 07 Jun 2026 13:26:36 GMT

Part Number: AMC43XXDVVEVM-DOC-CERT
Other Parts Discussed in Thread: AMC1311, AMC1400, AMC1411

1. The simulation is showing the problem shown in the image. Also, can PSPICE be set to two different grounds?

2. I need to design a DC 2000V current of 500uA. I'm using an AMC1311, although I know this chip is used for voltage measurement.

If I were to use an AMC1400 for current measurement but with a lower internal resistance, are there any recommended solutions or methods?

Thank you.

ISOW1044: ARNIC 825-1

Venkata Rami Reddy Vempati — Wed, 03 Jun 2026 19:09:30 GMT

Part Number: ISOW1044

Hi Team,
Please confirm whether the ISOW1044 part number supports ARINC Specification 825-1

ISO6521: ISO6521 maximum input current

Alecsandru Neacsu — Tue, 02 Jun 2026 08:38:58 GMT

Part Number: ISO6521

ISO6521 datasheet shows (chapter 7.4.1) that there are inner diodes on each input (also specified in absolute maximum ratings, the "+/-0.5V"). In my application there may be occasional (=surge/exception) situations where input voltage can go beyond local supply. I intend to add series resistors with inputs for such situations. To properly size these resistors, I need to know the absolute maximum value for the input current, when the inner diodes are conducting.

ISO1211: ISO1211 - EMI/EMC Design support and troubleshooting

Pavan Patil — Mon, 01 Jun 2026 06:45:20 GMT

Part Number: ISO1211
Other Parts Discussed in Thread: STRIKE,

Hello TI team,

We are currently using the ISO1211D IC for digital inputs in our project.

We would like to clarify whether it is acceptable to connect both FGND and GND to the same ground in this configuration.

In our projects, we are using both isolated and non-isolated configuration.

Inferences:

EFT specifications:

Parameter	Specifications
Voltage:	U = ± 2 kV
Impulse form:	tA = 5 ns (10 % - 90 %) tD = 50 ns (50 % - 50 %)
Pulse Repetition:	f = 5 kHz
Burst Duration:	tB = 15 ms
Burst Repetition	tr = 300 ms
Coupling-/decoupling network: Coupling capacity: Coupling inductivity:	CC = 33 nF LX ≥ 100 µH
Test length:	t ≥ 1 min
Coupling: Power Line:	CDN

The isolated configuration successfully passes the EFT test, whereas the non-isolated configuration fails to meet EFT requirements.

We have attached our current circuit for your reference. Kindly review it and suggest any improvements if necessary.

Isolated Configuration:

2. Non- isolated configuration:

Thank you
Pavan Patil

ISOW1044: Replace ADM3053

GARETH OU — Fri, 29 May 2026 07:24:29 GMT

Part Number: ISOW1044

Could you help provide suggestions on products that can replace ADM3053. Thanks

UCC14141-Q1: UCC14141QDWNRQ1- Design Support

Rajshree Chaudhari — Fri, 29 May 2026 06:39:44 GMT

Part Number: UCC14141-Q1
Other Parts Discussed in Thread: UCC34141

Hello,

I am currently working on a circuit design that incorporates the UCC14141QDWNRQ1. I am generating a single 18 V output from a 12 V input (VDD to VEE configuration).

Could you please guide me on the role of RLIM in the VDD–VEE configuration?

Also, could you please suggest a smaller package device available with 5 kV isolation, supporting a 12 V input and 15 V or 18 V output?

Your support is greatly appreciated.

Thanks and regards,

Rajshree C

ISOW1412: Regarding the differences in model numbers

TAKAFUMI IKEDA — Fri, 29 May 2026 04:24:02 GMT

Part Number: ISOW1412

What is the difference between ISOW1412DFMR and ISOW1412BDFMR? I checked the datasheets, but I couldn't find the difference.

Please explain. Thank you.

ISO7761: Creepage on Dig. Isolators

Florian Kolb — Thu, 28 May 2026 12:43:57 GMT

Part Number: ISO7761

Hi everyone,
i found the description of the creepage definition:
The shortest path between two conductive parts measured along the surface of the insulation.

A common practice is to add grooves in the PCB to increase the creepage distance. Is this correct, because the IC is directly above the PCB and no distance between the bottom side of the IC and (!) the PCB itself. I have the fear, that during certification the lab can complaint in the way that the bottom side of the IC "shorten" a possible creepage groove.

Does anyone got feedback during certification during usage of grooves?

Best regards

ISOW1432: Query Regarding Isolated RS485 IC with Integrated DC-DC Output on UART Side

pooja ak — Thu, 28 May 2026 07:34:01 GMT

Part Number: ISOW1432

Dear TI Team ,

I am looking for an isolated RS485 transceiver with integrated isolated DC-DC power similar to ISOW1432, but with a different power architecture requirement.

My requirement is to have the isolated DC-DC output available on the UART/logic side. I am planning to use this isolated power output for external circuitry on the UART side.

For better understanding, I have attached the block diagram illustrating the expected architecture.

Could you please suggest an IC that meets this requirement?