Switches & multiplexers forum - Recent Threads

TMUX1072: Voltage range on analog input/output pins

Roc Peng — Fri, 31 Jul 2026 09:57:52 GMT

Part Number: TMUX1072

Dears,

TMUX1072 is selected to be used for switch RS485 signals. What about the Voltage range on analog input/output pins of NC1,NO1,NC2,NO2? From the attached datasheet, it says 5.5Vmax. If the Vcc is 3.3V, can those four pins still withstand 5.5V? Do these four pins voltage have relating to the supply voltage? Please give your detail description. It will be better if you can share the internal block diagram!

Thank you very much!

Roc

Withstand voltage.pdf

SN74CBT3244: SN74CBT3244DWR alternative?

Sean Liao (Yu-Sheng) — Fri, 31 Jul 2026 02:46:51 GMT

Part Number: SN74CBT3244

Hi sir,

SN74CBT3244DWR shows NRND on TI.com

Is there alternative solution?

Thanks a lot!

SN74CBT16210C: Level Shifter Technique on CBT devices

Hideki Hayashi1 — Wed, 29 Jul 2026 13:48:11 GMT

Part Number: SN74CBT16210C
Other Parts Discussed in Thread: SN74CB3T16210,

Hi team,

I have questions about two application notes below.

www.ti.com/.../scda003b.pdf

www.ti.com/.../scea035a.pdf

Customer would like to do level-translation from Vi=5V to Vo=3.3V with VCC=5V.

The apps note explain that Vo will be Vcc-Vf(~0.7V)-Vgs(~1V) if a diode put between VCC pin and 5V supply. Is it correct? But I think the Vf and Vgs varies, so the Vo could be over 3.3V in some combination, what do you think? Do customer needs to use SN74CB3T16210 or they can implement with using SN74CBT16210C with the configuation being explained at the apps notes?

Best regards,

Hayashi

TMUXS7614D: Clarification on data sheet plot 5-21 "THD+N vs Frequency"

Sanjay — Wed, 29 Jul 2026 05:11:02 GMT

Part Number: TMUXS7614D

Hi Team,

I am using this part for high fedelity application and was going though the THD+N specs and plots. Can you please provide a explanation why the higher ouput span has better THD+N ?

Thanks,
Sanjay

TUSB7340: TUSB7340IRKMT IC - Intermittent PCIe Enumeration Failure During Startup

Vijay M — Mon, 27 Jul 2026 12:17:47 GMT

Part Number: TUSB7340

We are currently investigating an intermittent issue with the TUSB7340IRKMT USB 3.0 Host Controller. In the failing condition, the device does not drive the downstream USB 3.0 ports. The PCIe interface of the TUSB7340 is connected to and controlled by a Raspberry Pi CM4.

Analysis of the system logs during failure indicates that the PCIe link is down, suggesting that the root cause is likely on the PCIe interface side rather than on the USB downstream ports.

The issue is intermittent and occurs only occasionally during power-up. It is not consistently reproducible. We have observed the issue across all five boards tested, although the occurrence rate varies from board to board.

To investigate further, I monitored the power-up sequence in both working and non-working conditions (waveforms attached for reference). One notable observation is that the PERST# signal briefly transitions high and then low again within a very short time interval during startup. This behavior appears to trigger a PCIe reset sequence and may be contributing to the PCIe link failing to establish correctly. PFA images

What could be causing this issue? Would adding a pull-up to the PERST# signal help improve startup reliability? Additionally, what further investigations would you recommend to determine the root cause and drive the analysis to closure? We are looking for guidance on key signals, timing relationships, and debug steps that should be monitored to identify why the PCIe link occasionally fails to come up during power-up.

TMUX1511: TMUX1511RWBR PKG information

Daisuke Nomura — Sun, 26 Jul 2026 10:02:46 GMT

Part Number: TMUX1511

Please provide the tolerance specification for part height T0.4 (max) mm. Reason: For implementation considerations. Target device is TMUX1511RWBR.

SN74LVC1G3157: Screen printing issues

Allen yang — Fri, 24 Jul 2026 08:44:54 GMT

Part Number: SN74LVC1G3157

Hi Team,

The screen printing on the incoming materials SN74LVC1G3157DCKR does not match the system specifications.

SN74LVC1G3157: Missing Thermal information for SN74LVC1G3157DSFR

Beverly Lesser — Thu, 23 Jul 2026 13:10:35 GMT

Part Number: SN74LVC1G3157

What are the thermal resistance values for the DSF version of SN74LVC1G3157? Looking for Rjc(top) and Rjb. Thank you.

TS5USBC400: multiplexer IC requirements for USB 2.0 and eUSB - TMUXHSS221LV vs TS5USBC400

Michael T Schneider — Thu, 23 Jul 2026 06:07:06 GMT

Part Number: TS5USBC400
Other Parts Discussed in Thread: TMUXHS221LV,

Could you help me understand the multiplexer IC requirements for USB 2.0 and eUSB?

While the TMUXHSS221LV explicitly supports eUSB 2.0 in its datasheet, we used the TS5USB400 in our recent design and encountered issues with a specific IC.

Could you explain what might go wrong if we use the TS5USB400 instead of a dedicated eUSB 2.0 mux like the TMUXHSS221LV?

SN74LV4052A: SN74LV4052APWR – Unused Channel and INH Connection

Amichai Blum — Wed, 22 Jul 2026 13:43:37 GMT

Part Number: SN74LV4052A

Hi,

I have a question regarding the SN74LV4052APWR.

I'm only planning to use 3 out of the 4 available channels. What is the recommended way to handle the unused channel?

Is it acceptable to connect the unused channel directly to GND?
If so, are there any concerns regarding power consumption or other side effects?

Also, I'd like to connect the INH pin to a microcontroller. The HIGH output voltage from the MCU can range between 2.5 V and 3.3 V.

Is there a recommended way to interface the INH pin in this case?
Should I use a pull-up resistor or any other external components?

SN74LVC1G66-Q1: M74VHC1GT66 EOL

GARETH OU — Wed, 22 Jul 2026 07:33:11 GMT

Part Number: SN74LVC1G66-Q1

M74VHC1GT66DTT1G => EOL

Replacement SN74LVC1G66DBVR

The end customer has reported issues with their current IC, specifically insufficient protection in long-distance outdoor RS 422 environments up to 2 km, tunnels, highways, and other high-interference areas

They need a component that meets the following specifications and has a package compatible with the M74VHC1GT66DTT1G

Any other suggestions?

• Provides complete isolation of RXD+ and RXD when VCC is off

• Has robust protection against negative swings, surges, and common RS 422 mode conditions

• Is rated for full RS 422 operation, ideally supporting ±15 V or higher on the analog pins

Thanks

TMUX182-SEP: PTMUX182MDYYTSEP Information

Evan Sattler — Tue, 21 Jul 2026 14:28:55 GMT

Part Number: TMUX182-SEP

Regarding part number PTMUX182MDYYTSEP:

What is the termination finish and MSL rating?
Is this part qualified by similarity to testing data for TMUX182MDYYTSEP?
What is the timeline of this getting moved out of preproduction?

TMUX1574: High speed switch

Daniel Wang (auto) — Tue, 21 Jul 2026 02:48:07 GMT

Part Number: TMUX1574

Hi team,

My customer want to find high speed switch solutions in TBOX application, for a 4G antenna RF signal (3Gbps) and a SIM card switching (10Mb) independently, may you suggets your best solutions? Better to have Automotive solutions.

BR,

Daniel

TMUX7612: Shorter turn on time MUX than TMUX7612

Hiromu Susami — Tue, 21 Jul 2026 01:18:41 GMT

Part Number: TMUX7612
Other Parts Discussed in Thread: TMUX6212

Hi experts,

Could you propose recommended MUX that meets following requirements?

[Mandatory]

Vcc +/-15V
Ton/Toff: <500nsec

[Nice to have]

p2p with TMUX7612(TSSOP)
Ron: <100orm
Leak current: <1nA
Charge injection: <10pC

TMUX6212 is one option even though Charge injection spec doesn't meet.

Regards,
Hiromu

HD3SS3220: Clarification on HD3SS3220 SuperSpeed TX/RX Connections for Host Design

Vaindu Sheppy — Mon, 20 Jul 2026 06:28:45 GMT

Part Number: HD3SS3220

Hi TI Support,

We are using the HD3SS3220 in Design. The HD3SS3220 is connected to the CPU TCP (Type-C Port) interface, and the USB Type-C connector is intended for USB 3.x data only.

While reviewing the HD3SS3220 reference designs, we noticed that the DFP reference schematic appears to have the SuperSpeed TX and RX pairs crossed. However, we understand that this reference design is for a USB-A to USB-C dongle, which may have a different signal topology.

For our CPU TCP host design, could you please confirm whether the SuperSpeed lanes should be connected as follows?

CPU TCP SSTX± → HD3SS3220 Host TX±
CPU TCP SSRX± → HD3SS3220 Host RX±

In other words, should we connect TX-to-TX and RX-to-RX for a standard CPU TCP host implementation, or is any TX/RX crossover required?

Could you also confirm that the HD3SS3220 internally handles the SuperSpeed lane switching for USB Type-C cable orientation, so no external TX/RX crossover is needed?

Regards,
Vaindu

TPS7H2201-SP: Enable pin circuit configuration

Nandha Kumar5 — Sat, 18 Jul 2026 10:52:34 GMT

Part Number: TPS7H2201-SP

Hi,

Datasheet for the TPS7H2201-SP mentions that EN pin must not be left floating. We are using a pull down resistor and a optocoupler to drive this pin. Request you to confirm applicability of the circuit across temperature range and spread

TS5A22362: Audio Isolation Switch

Steven Wallace — Tue, 14 Jul 2026 20:23:23 GMT

Part Number: TS5A22362
Other Parts Discussed in Thread: TMUX4827

Hello, I am looking for a switch that would allow signals to pass when our entire board is without power, but would stop signals from passing through when there is power.

We have considered a discrete and depletion mode PMOS, but those are not manufactured. We have also considered a p-channel JFET, but its on-resistance would be too high.

Would you happen to have a switch that would match these criteria?

To provide a little more context here, we are designing an aviation headset. This headset should pass audio signals from a wired connection straight through to the speakers in the event our headset's battery is dead. That explains why the switches must pass signals through when the board is not powered. However, when the headset is powered, we want the audio signals to instead pass through an SOC for further processing before reaching the speakers. In this case, the switches in question would not allow our signal through.

There are four signal paths that must be controlled in this fashion, and we are currently solving this problem with depletion mode NMOS devices. We apply a negative voltage to their gate when the board is powered, which isolates the source from the drain.

The signal in question has an amplitude of 6.93 V above and below ground, our maximum current is approximately 23.05 mA, and the on-resistance of this switch must be less than 500 mohm.

Do you have any switches or multiplexer chips that would fit this situation?

TMUX2819: Correct leakage current clarification

ArTzy — Tue, 14 Jul 2026 15:27:59 GMT

Part Number: TMUX2819

Hi Experts,

I am looking at the values of the leakage current of an open channel in the limit for the device TMUX2819. In the table, the value for 85 degrees is +/-0.1uA, and on the graph it is around 1na. It seems like there's a typo in the table - all the leaks have the same value.

What values should I use?

Thank you.

Regards,
Archie A.

LM2673: RoHS Compliance Inquiry – LM2673S-ADJ/NOPB – (60-934138)

MAHESH BABU MULAM — Tue, 14 Jul 2026 06:04:07 GMT

Part Number: LM2673
Other Parts Discussed in Thread: LMR60430, LMR14030,

Dear Concern,

Greetings,

Please find below the list of part numbers that are currently compliant with RoHS with exemptions.
As some of these exemptions are expected to expire by 2027, we would like to proactively understand the long-term compliance roadmap for these components.

Could you please support us with the following information:
1. Are there any alternate part numbers available that are fully RoHS compliant without exemptions?
2. If not currently available, what is Diode Incorporated’s plan to transition these parts to full RoHS compliance before the exemption expiry in 2027?
3. What is the expected timeline for these transitions?

Part number(s):
1) LM2673S-ADJ/NOPB / Texas Instruments

2) LM2673SX-ADJ/NOPB / Texas Instruments

We appreciate your support in helping us ensure regulatory compliance and supply continuity.

Looking forward to your response.

Best Regards,

Mahesh babu.

SN74CBT3345: difference between SN74CBT3345 and SN74CBT3345C

Daisuke Nomura — Sat, 11 Jul 2026 02:15:31 GMT

Part Number: SN74CBT3345

End-of-Life Part: SN74CBT3345PWR Replacement Part: SN74CBT3345CPWR Could you explain the difference between these two products?

CD74HCT4067: CD74HCT4067 leak current

teshima yohei — Fri, 10 Jul 2026 12:10:22 GMT

Part Number: CD74HCT4067

Hi, team

On page 8 of the CD74HCT4067 datasheet (Document No. SCH209D), there are two types of leakage current specifications: IZ (Off-Switch Leakage Current) and IIL (Input Leakage Current). What is the difference between them?

Best regards

TMUXHS4446: TMUXHS4446 : I²C Timing Characteristics for 100 kHz (Standard Mode)

Ryota Nagai — Fri, 10 Jul 2026 02:54:16 GMT

Part Number: TMUXHS4446

Hello,

I have a question regarding the I²C timing specifications in the datasheet.

The datasheet provides timing parameter values for operation at frequencies up to 400 kHz. However, I could not find timing specifications for operation at 100 kHz or below.

For operation at 100 kHz (I²C Standard-mode), should we refer to the timing requirements defined in the I²C specification (UM10204 Standard-mode), or are there separate timing specifications that should be applied to this device?

TMUX1574: External Pull-Up Resistor for the TMUX1574

takahiro higuchi — Thu, 09 Jul 2026 02:32:13 GMT

Part Number: TMUX1574
Other Parts Discussed in Thread: SN74AXC4T774

Hi team,

I am researching JTAG signal switching circuits and am considering a MUX + LV conversion configuration.
The SN74AXC4T774PW specifies that the external pull-up resistance must be 7kohm or less.
Is it acceptable to connect a 10kohm pull-up resistor to the S1A pin of the TMUX1574?
Or should I use a pull-up resistor of 7kohm or less?

Best regards,

HD3SS3220: few questions for the debug accessory mode

Henry Wang3 — Tue, 07 Jul 2026 14:30:51 GMT

Part Number: HD3SS3220
Other Parts Discussed in Thread: TLV3202,

Hi Sir,

My customer has a few questions regarding the operation of the HD3S3220.

1. When the HD3S3220 is configured as a UFP, can we use I/O pins to configure entry into debug accessory mode? Specifically, should both the CC1 and CC2 pins be pulled low via 5.1k Ohm resistors?

2. While the device is in debug accessory mode, do the USB SuperSpeed differential signals (TX/RX) still function normally for data transmission?

3. During debug accessory mode, is it possible to connect the CC1 and CC2 pins to a comparator(TLV3202) to determine the High/Low logic? shown as below figure.

CD74HC4051: pin13/pin14 are short to VEE internally

Gary Zeng — Tue, 07 Jul 2026 06:33:21 GMT

Part Number: CD74HC4051

Hi team,

My customer is using CD74HC4051M96 in traction inverter and meet damaged issue.

Pin13 and Pin14 are short to VEE.

Yellow means pin16. Blue means PIN14. Red means PIN13.

Q1: Though in datasheet, input signal can not exceed VEE ~ VCC(they use 5Vcc). they still want to know the transient peak voltage and time of duration (ns)

Q2: How to deal with this case, add ESD/TVS on input end? which PN do you recommend?