Switches & multiplexers forum - Recent Threads

RE: TMUXHS4212: Connection of RSVD pins

Miroslav Kuzmanovic — Mon, 14 Sep 2026 19:48:51 GMT

Hi Arya,

Thank you for the prompt reply.

However, is that certainly correct? This info contradicts both Schematic Checklist for TMUXHS4212EVM and TMUXHS4412EVM and design of the EVM. Pads are only connected to the test point on EVM and there are no notes in the User's guide about need to connect them to anything. I guess someone tested EVM at this point and would notice if device is going into test mode?

Is there any way to get some certainty about this issue?

Best Regards

TMUXHS4212: Connection of RSVD pins

Miroslav Kuzmanovic — Mon, 14 Sep 2026 16:52:38 GMT

Part Number: TMUXHS4212

There is a conflicting data in the data sheet for the part. In table 5-1 (Pin Functions) pins RSVD1 and 2 are describer as: Reserved Pins. Connect both to Vcc. However, in layour example both pins are NC and not routed out.

Also in scxhematic checklist, they are described as Resewrved Leave Open. On EVM scxhematic both pins are connected to tyest points and not Vcc.

I plan to leave them not connected but would like to get a confirmation if that is correct choice. Also it makes sense to update the data sheet with proper description.

Best Regards

RE: TMUXHS4212: Connection of RSVD pins

Arya Hussein — Mon, 14 Sep 2026 17:36:02 GMT

Hi Miroslav,

You would want to connect these pins to VDD, as leaving them could cause the device to enter test mode.

Thank you,
Arya

TMUX1574: Required Technical parameters for MPN "TMUX1574RSVR"

Bill Tseng — Mon, 14 Sep 2026 10:33:28 GMT

Part Number: TMUX1574

Hi Team

Could you please help to provide Output Current data for TMUX1574RSVR?

Thank you very much

RE: TMUX1574: Required Technical parameters for MPN "TMUX1574RSVR"

Arya Hussein — Mon, 14 Sep 2026 17:22:15 GMT

Hi Bill,

The current will be 50nA.

Thank you,
Arya

RE: TMUX136: Required Technical parameters for MPN "TMUX136MRSER"

Arya Hussein — Mon, 14 Sep 2026 17:19:41 GMT

Hi Bill,

1. 150C

2. 10.4mW

Thank you,

Arya

TMUX136: Required Technical parameters for MPN "TMUX136MRSER"

Bill Tseng — Mon, 14 Sep 2026 10:28:29 GMT

Part Number: TMUX136

Hi Team

Could you please help to provice below parameter for TMUX136MRSER?

1. Max junction temperature

2. Power dissipation

Thank you very much

RE: CD74HC4053: Noise in a Synchronous Demodulator Using the CD74HC4053

Arya Hussein — Mon, 14 Sep 2026 17:05:37 GMT

Hi Haya,

It looks like Maximum switch delay could be the issue here (Break before make). It does however look like the device seems do a better job in isolation compared to previous die.

Some device that look to be a good alternative would be the TMUX4053.

Thank you,
Arya

CD74HC4053: Noise in a Synchronous Demodulator Using the CD74HC4053

Haya K — Mon, 14 Sep 2026 08:40:12 GMT

Part Number: CD74HC4053

Hi, all

I have a question about the CD74HC4053.

I am using the CD74HC4053PWR to switch between inverting and non-inverting modes in a synchronous demodulator circuit.

Noise is occurring at the switching timing. (See the waveforms in the figure below.)

Before the change	After the change

This issue had not been observed previously, but it has begun occurring on boards that incorporate the ICs with the 2024 specification changes.

What could be the cause of this?

Also, are there any alternative parts that meet the following requirements

SPDT(2:1)
Supports ±2.5V and ±5V dual power supply
Die available

SN74CBTLV3257: SN74CBTLV3257PWR output current

Bill Tseng — Mon, 14 Sep 2026 03:00:51 GMT

Part Number: SN74CBTLV3257

HI Team

Could you please help to provide output current for SN74CBTLV3257PWR , thank you very much.

RE: SN74CBTLV3257: SN74CBTLV3257PWR output current

Arya Hussein — Mon, 14 Sep 2026 15:50:42 GMT

Hi Bill,

The current would be 10uA.

If you are asking about the continuous current it will be 128mA.

Thank you,
Arya

TS3USB221E: 10Base-T1S

Paul Gregg — Fri, 11 Sep 2026 08:12:54 GMT

Part Number: TS3USB221E

Would the TS3USB221E be suitable to switch in the EndNode termating resistors for a 10Base-T1S network?

RE: TS3USB221E: 10Base-T1S

Katy West — Fri, 11 Sep 2026 14:59:40 GMT

Hi Paul,

Given the bandwidth of this device, 1GHz, and the VCC voltage of this device, this should be suitable for 10Base-T signals. This is a passive mux, so as long as the input signals fall within the recommended operating conditions, it should work!

Best,
Katy

TMUX1136: Chip marking code confirmation

APPLO ZHANG — Fri, 11 Sep 2026 14:10:35 GMT

Part Number: TMUX1136

Hi,TI expert:

Is the chip silk-screened in the following image corresponding to the TMUX1136 chip? Please confirm . Thank you!

TI27
P14RA
1136

RE: TMUX1136: Chip marking code confirmation

Katy West — Fri, 11 Sep 2026 14:38:20 GMT

Hi Applo,

Yes, this is the correct topside marking for this device.

Best,
Katy

RE: UCC28740-Q1: Silicon Errata Sheet

ROHAN SHAH — Fri, 11 Sep 2026 12:39:01 GMT

Hello

[quote userid="717560" url="~/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1681478/ucc28740-q1-silicon-errata-sheet"]Does this IC have an errata sheet? If not, reply: No.[/quote]

reply: NO

Regards

Rohan

UCC28740-Q1: Silicon Errata Sheet

Lin Hong — Fri, 11 Sep 2026 09:13:14 GMT

Part Number: UCC28740-Q1

TI part number: UCC28740QDRQ1

Does this IC have an errata sheet? If not, reply: No.
If an errata sheet exists, were there any changes to the errata sheet during the most recent quarter (July to September)? If changes were made, please specify the revision content; if not, reply: No changes.
Regardless of whether the errata sheet was updated, please provide the document attachment of the latest errata sheet.

TMUX1308A-Q1: Coefficient of thermal expansion for TMUX1308

Jacob Bratkowski — Thu, 10 Sep 2026 18:44:23 GMT

Part Number: TMUX1308A-Q1

I am in need of the CTE data for the TMUX1308 as well as AECQ006 since the component has copper bond wires. Any help would be appreciated.

RE: TMUX1308A-Q1: Coefficient of thermal expansion for TMUX1308

Katy West — Thu, 10 Sep 2026 20:33:21 GMT

Hi Jacob,

This information can be found by requesting a PPAP here!

Best,
Katy

SN74CB3Q3257: Request for Historical Datasheet – SN74CB3Q3257PWR (SCDS135E)

lianhua shan — Thu, 10 Sep 2026 07:19:59 GMT

Part Number: SN74CB3Q3257

Dear TI Team,

We would like to obtain the previous revision of the datasheet for SN74CB3Q3257PWR.

Document No.: SCDS135E

We need the official Rev. E version for engineering specification comparison.

Thank you.

RE: SN74CB3Q3257: Request for Historical Datasheet – SN74CB3Q3257PWR (SCDS135E)

Katy West — Thu, 10 Sep 2026 15:54:56 GMT

Hi lianhua,

Please see the attached

e2e.ti.com/.../scds135e.pdf

Best,
Katy

RE: TMUX7234: Plateau at fast rising edge

Arya Hussein — Thu, 10 Sep 2026 15:31:41 GMT

Hi Nikolas,

Can you email me a-hussein@ti.com. So we can send more information through email.

Thank you,
Arya

TMUX7234: Plateau at fast rising edge

Nikolas Zingraf — Thu, 25 Jun 2026 13:56:28 GMT

Part Number: TMUX7234

Hello,

I am having an issue with is the TMUX7234 -SSOP20 (www.ti.com/.../TMUX7234). We use this component to isolate a total of 4 analog outputs from the output connector. For this purpose, one input (Port A) is connected to the analog signal, and the second (Port B) is connected to the ground potential.

We have now found that with steep edges of about 1 V/µs on Port 4A, all outputs are pulled to ground (see image Plateau_AOUT1_10kOhm). In this image, the yellow curve represents the output of the first channel on the TMUX7234 (which should remain static at 10 V), and in green, you can see the output of the fourth port, which jumps from -10V to +10V. Since the steepness of the signal on Port 4 is greater than 1 V/µs, the TMUX7234 generates a plateau of about 20 µs that affects all outputs simultaneously. This behavior only occurs when the jump happens on the fourth port and only on the rising edge. We have already disconnected the circuit before the TMUX7234 and fed it directly with a signal generator, resulting in identical behavior.

Additionally, we have increased the decoupling capacitors of the power supply without improvement. Therefore, we strongly suspect that the TMUX7234 is causing this behavior. Furthermore, we have observed that the steeper the edge, the earlier (closer to 0 V) the plateau occurs (compare image (6) and image (7)). Another test on input 4B yields the following result (see image (8)).

We have also seen that even with very steep falling edges, all input ports likely exhibit a slight “glitch” (see image (9) = steep falling edge at input 1B and image (10) = steep rising edge at input 1B).

The marking on the tested ICs is: T234 TI53K A75T

Are you familiar with such behavior? In our application, this is a very undesirable behavior, especially that Port 4A is so easily disturbed.

Plateau_AOUT1_10kOhm:

image (6)

image (7)

image (8)

image (9)

image (10):

RE: TMUX7219-Q1: Switch ops

Nir Gilgur — Thu, 10 Sep 2026 14:18:28 GMT

Hello Nishant,

I see, I don't think the space parts we currently have will fit your application but I have linked them below.
https://www.ti.com/product-category/switches-multiplexers/analog-mux/products.html#-1=sep%3Bfalse&

I cannot recommend the TMUX1101 to be used in a space application, since it is not qualified for it.

Thanks,

Nir

TMUX7219-Q1: Switch ops

Nishant Gupta — Fri, 14 Aug 2026 18:14:00 GMT

Part Number: TMUX7219-Q1

I want to use this switch as Spdt WITH 6V and 0V so how much stabilty i willl get .I need typical stability of <0.25mV.How to do that any provision or what I need to do. Current scheatic shown belowCommon is 0V . S1 pin connected to 6V and Vdd pin will be 6.5V (wrong mentioned in schematic).What needs to be done