Switches & multiplexers forum - Recent Threads

TS5A23166: Supply Current

Takashi Imai — Mon, 31 Aug 2026 02:33:01 GMT

Part Number: TS5A23166

Hello,

I have received the following inquiry from our customer regarding the supply current of the TS5A23166DCUR. Could you please assist me with the response?

The customer reports that the supply current (I+) is approximately 5mA under the following operating conditions.
V+ pin: 5.5 V
IN1 / IN2: 3.3 V
NO1 / NO2: 0.14 V to 1.5 V, source output impedance = 200 kohms
COM1 / COM2: Connected to the MCU ADC input, input resistance = 2.5 kohms

The customer also reported that, as a trial, increasing the IN1/IN2 voltage from 3.3 V to 5.5 V reduced the supply current to less than 0.1 µA.

I have received the following two questions from the customer. Could you please advise?

What could be the possible cause of the increase in supply current (I+) to approximately 5 mA when IN1/IN2 are set to 3.3 V?
The assumption is that, because the CMOS input voltage is at an intermediate level relative to the supply rails, the internal PMOS and NMOS transistors are simultaneously conducting, resulting in increased shoot-through current. Is it possible that this is what's occurring internally?
The datasheet specifies that VI should be set to the same voltage as IN1/IN2 when measuring Supply Current. Are there any disadvantages if VI is not set to the same voltage as IN1/IN2?
For example, could this result in device reliability concerns, excessive power dissipation, loss of analog switch functionality, increased supply current, or even device damage due to excessive internal current?

Thanks & Regards,
T.Imai

RE: TS5A23166: Supply Current

Takashi Imai — Tue, 01 Sep 2026 03:05:35 GMT

Hi Nir-san,

Thank you for your support,

[quote userid="523820" url="~/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1677757/ts5a23166-supply-current/6467831"]You said they are "setting" to 3.3V, can you confirm if the IN pins actually see 3.3V on them? [/quote]

Understood. I will check this with the customer.

Regarding Question 2, I made a mistake in the English translation of the customer's question. The correct question is as follows:

We could not find any statement in the datasheet indicating that the V+ pin and the IN1/IN2 pins must be at the same voltage level.
If V+ and IN1/IN2 are operated at different voltage levels, are there any disadvantages, limitations, or reliability concerns that should be taken into consideration?

Could you please provide your feedback on this question?

Thanks & Regards,
T.Imai

TMUX1204: Schematic Review

Tilden Chen — Mon, 31 Aug 2026 21:23:03 GMT

Part Number: TMUX1204

Hello Mux Team,

I'm an applications engineer from DLP team developing an EVM featuring your device, TMUX1204. Using the mux to select between different DAC outputs, up to 20 kHz, and connected to ADC input. Please let me know if you have any suggestions to improve the schematic.

Schematic - p67 PLM EVM - DLP135.pdf

TMUX4827: PC notebook application

William Lai(CFAE) — Mon, 31 Aug 2026 18:23:44 GMT

Part Number: TMUX4827

Hi team,

Regarding the speaker and headphone audio outputs, our customer need to switch between the scaler and the audio codec as shown below.

Is TMUX4827 suitable for that purpose, or would you recommend another part?
The audio switch would be controlled by the scaler, and the amplifier’s mute function would also be handled by the scaler.

Best Regards,
William Lai

ULN2003ADYYEVM: ULN2003ADYYEVM

Jason Williams71 — Mon, 31 Aug 2026 15:39:56 GMT

Part Number: ULN2003ADYYEVM

Hello, Why does the ULN2003ADYYEVM have 10k pull-downs on each input when the ULN2003ADYY already has 7.2k and 3k resistors connected between the input base and emitter of each respective NPN channel? What added benefit do they provide?

Thank you

RE: TS5A23166: Supply Current

Nir Gilgur — Mon, 31 Aug 2026 15:34:35 GMT

Hello Imai-san,

1. It could be shoot through current, but that will happen if the voltage level is between the threshold regions. 3.3V is above the MIN VIH, so it shouldn't cause that.

You said they are "setting" to 3.3V, can you confirm if the IN pins actually see 3.3V on them?

2. I am not sure what section of the datasheet you are referring to, can you specify?
VI is the voltage on the IN pins, they are the same thing.

VI is defined as the voltage on the control inputs, which are the IN pins.

VI will always be the same voltage as the IN pins.

Thanks,

Nir

RE: TS5A3157: CCOM maximum capacitance

Arya Hussein — Mon, 31 Aug 2026 12:55:24 GMT

Hi Joe,

NC and COM both have the 17.5 capacitance value. When connecting COM and NC the capacitance would resulting in 17.5pF + 17.5pF.

But if just directly measuring from COM than it would just be 17.5pF.

Thank you,
Arya

TS5A3157: CCOM maximum capacitance

Joe Miller1 — Fri, 28 Aug 2026 11:39:10 GMT

Part Number: TS5A3157

Dear Sir/Madam,

I am looking for a single supply analog switch that has less than 30pF maximum capacitance.
The image below illustrates what I am tryinto do. The VSET/VID pin need to have less than 30pF capacitance. Basically less than 30pF on the COM pin to GND when the switch is connected COM to NC or COM to NO. The TS5A3157 specifies Cno(on)/Cnc(on) as 17.5pF (typ) and ccom(on) as 17.5pF typ. Does this mean that if the switch is on and COM is connected to NC the the capacitance seen at the com pin is 17.5pF + 17.5pF (35pf) or just 17.5pF? What is the maximum capacitance values? If TS5A3157 the is not suitable what part would you recommend?

Regards Joe

TMUX6234: Maximum Pulse Current

Till Glage — Thu, 27 Aug 2026 09:20:17 GMT

Part Number: TMUX6234

Hello,

I am currently designing a circuit which drives switching inputs for an RF switch. These inputs require either appr. -30 V or 0 V, so I found wiring the TMUX6234 to -30 V and 3.3 V to be a suitable solution for controlling these switch inputs with 1.8-V-logic. However, switching time plays a crucial role in my application. Therefore, I would like to know more details about the pulse behaviour of the part, such as the maximum pulse current and whether it is safe to directly connect the outputs to the pins.

Unfortunately, the chip manufacturer could not provide detailed information on the switching input pins, but I suspect it is in the order of a few pF. The desired switching time would be in the nanosecond-range.

I look fordward to receiving some insights into pulse operation.

Best regards,
Till Glage

RE: TMUX6234: Maximum Pulse Current

Till Glage — Mon, 31 Aug 2026 05:38:22 GMT

Hi Arya,

Thank you. I will consider that.

Best regards,
Till

RE: SN74CB3T3257: S pin max switching frequency / tBBM

Nir Gilgur — Mon, 31 Aug 2026 01:37:10 GMT

Hello Danilo,

1. We don't specify switching speeds in frequency, but in time as below:

at 50 to 100MHz the switching times will be around 10ns (for the 100MHz point).
It is close to the limit, but it should be fine, since the specification are at 85C, so operation will be better at room temp.

2. We don't have that specified in the datasheet, but it is break before make. There shouldn't be any overlap.

3. This device has a charge pump topology as well as a gate driver circuit tied to the gate of the FET that turns on the switch.

Thanks,

Nir

SN74CB3T3257: S pin max switching frequency / tBBM

Danilo A. — Fri, 28 Aug 2026 21:11:20 GMT

Part Number: SN74CB3T3257

Hi Team,

Posting on behalf of our customer.

ontext: I'm evaluating SN74CB3T3257 to time-division-multiplex a 4-bit bus between two devices, with the S select pin toggling at a relatively high rate (in the range of 50-100MHz) to alternate which of the two channels is connected to the bus controller on a per-cycle basis. OE is held permanently enabled in my design and is not part of the high-speed switching path. I need to confirm the S pin specifically can safely support this switching rate without a transient overlap between the two channels during the switch transition.

Questions:

A maximum switching frequency for the S pin does not appear to be listed in the public datasheet's Switching Characteristics table — is there a characterization or recommended value that could confirm a safe operating point for a TDM application like the one described above?
Is there a guaranteed break-before-make time (tBBM) for the S-controlled channel transition — i.e., a guarantee that the previously selected channel is fully disconnected before the newly selected channel connects? This would help confirm there's no momentary overlap between the two channels during switching.
For additional context: what is the internal switching mechanism used by SN74CB3T3257 to drive the pass-transistor gates in response to the S input? The datasheet describes "voltage translation that tracks VCC" — could you clarify whether this involves any active gate-boost circuitry (e.g., a charge pump) or a simpler passive mechanism?

Regards,

Danilo

RE: TS5A3157: CCOM maximum capacitance

Joe Miller1 — Sat, 29 Aug 2026 04:50:36 GMT

Hi Arya,

Thank you for the reply.
I do not fully understand your response of 17.5pF + 17.5pF being the total capacitance measured at the COM pin.
The COM pin connects to the NC pin so they have the same capacitance measured from COM or measured from NC.

Regards Joe

RE: TMUX6234: Maximum Pulse Current

Arya Hussein — Fri, 28 Aug 2026 18:21:12 GMT

Hi Till,

1A is above the continuous current for source and drain limit (Idc ABS max is only +/- 10%. 400mA is the maximum). Even for a short time 1A would likely damage the device.

Thank you,
Arya

RE: TS5A3157: CCOM maximum capacitance

Arya Hussein — Fri, 28 Aug 2026 17:49:51 GMT

Hi Joe,

It will be 17.5pF + 17.5pF which would exceed your requirements. A device that has lower capacitance would be TS5A9411. It has 8.5pF which would be within your 30pF requirement.

Thank you,
Arya

RE: TS5A12301E: Vcc under 2.25V

Arya Hussein — Fri, 28 Aug 2026 17:26:39 GMT

Hi Far.

The device would enter a unknown state, the status of the MUX would be High impedance or partially open meaning some signal could pass through. 0V would guarantee the device is not partially on or operational.

Thank you,
Arya

TS5A12301E: Vcc under 2.25V

Far Hung — Fri, 28 Aug 2026 08:39:44 GMT

Part Number: TS5A12301E

Hi Expert,

I want to consult if the Vcc under the 2.25V, but not 0V. I mean not in isolation mode, what is the internal MUX staut would be?

Far

TUSB8041-Q1: TUSB8041-Q1 Figure 11 Pin Depiction Error

Bryce Johnson — Thu, 27 Aug 2026 23:45:35 GMT

Part Number: TUSB8041-Q1

It appears Figure 11 in the TUSB8041-Q1 datasheet depicts the VQFN package pinout instead of the HTQFP actually on the automotive version of this IC (that the datasheet is for). Can this error in pinout as shown in Figure 11 be confirmed?

RE: TUSB8041-Q1: TUSB8041-Q1 Figure 11 Pin Depiction Error

Brian Zhou — Fri, 28 Aug 2026 16:04:50 GMT

We will update datasheet as soon as we can since it normally take some time to update datasheet.

Best

brian

RE: TUSB8041-Q1: TUSB8041-Q1 Figure 11 Pin Depiction Error

Bryce Johnson — Fri, 28 Aug 2026 16:03:09 GMT

Thanks Brian. I figured that was the case, but good to get a confirmation.

RE: TUSB8041-Q1: TUSB8041-Q1 Figure 11 Pin Depiction Error

Brian Zhou — Fri, 28 Aug 2026 15:54:02 GMT

Hi Bryce:

I believe fig 11 was copied from TUSB8041 datasheet. pin 50 should be USB_DM_DN3.

pin function table should be correct,

Best

brian

SN74CBTLV3253: Inquiry regarding PCN 20260806001.1 impact on AC/DC characteristics and Propagation Delay

Min Hisen Kao — Wed, 26 Aug 2026 23:52:47 GMT

Part Number: SN74CBTLV3253

Hi TI Team,

My customer is currently evaluating the recent PCN 20260806001.1 for the SN74CBTLV3253DBQR.

We noticed the PCN includes a wafer diameter change (200mm to 300mm), a die shrink, and a wire bond change from 0.96mil Au to 0.8mil Cu. While the updated datasheet (Rev. K) mentions changes in the electrical tables, we need to understand the exact delta between the Pre-PCN and Post-PCN devices to ensure system compatibility.

Could you please clarify the following points regarding the new Die Rev A:

Electrical Characteristics: Is there a comparison table for typical values (e.g., Ron, Cio_ON, Cio_OFF) between the old and new revisions?
Propagation Delay & Load Capacitance: How exactly will the propagation delay (RC time constant) be impacted by the new die and Cu wire bond?
SDP Request: Could you share the Supporting Data Packet (SDP) for this specific PCN?

Any detailed characterization data would be highly appreciated to help the customer's EE team approve this transition.

Thanks!

RE: SN74CBTLV3253: Inquiry regarding PCN 20260806001.1 impact on AC/DC characteristics and Propagation Delay

Arya Hussein — Fri, 28 Aug 2026 14:16:28 GMT

Hi Min,

Do you have a local TI sale represent? Or how did you receive the PCN?

Thank you,
Arya

RE: TMUX6234: Maximum Pulse Current

Till Glage — Fri, 28 Aug 2026 13:59:40 GMT

Hi Arya,

Ideally, I would like to drive a pulse current of about 1 A for a short period of time. I would like to find out if it's possible to exceed the recommended value temporarily without damaging the part. Of course, the temporal mean would be below the maximum recommended value.

Best regards,

Till

RE: TMUX6234: Maximum Pulse Current

Arya Hussein — Fri, 28 Aug 2026 13:42:29 GMT

Hi Till,

What are you expecting the current to be? If the current does not exceed the recommended in the datasheet than it would be fine to connect to the pins.

Thank you,
Arya