Logic forum - Recent Threads

SN74LVC2G14-Q1: Temperature rating

John Schad — Tue, 16 Jun 2026 15:43:57 GMT

Hello,

Regarding the SN74LVC2G14-Q1 (specifically PN SN74LVC2G14IDCKRQ1) datasheet, Revision E (dated Jan 2025) of the datasheet updated the operating free air temperature from 85°C to 125°C. Would this updated operating free air temperature rating be valid for parts manufactured prior to January 2025? Was the part design always capable of 125°C operation, or was some change made to enable the higher temperature operation?

Thanks!

SN74LVC1G123: can you help review the SN74LVC1G123 logic design is expected or not

Roy Chan — Tue, 16 Jun 2026 14:05:22 GMT

Part Number: SN74LVC1G123

Hello Expert:

I attached the following design circuit of the SN74LVC1G123DCUR, the expectation of the design is that when "SOM_4V2" power on -> then the pin 5 of the SN74LVC1G123DCUR will briefly go to pull high to trigger the U2003 MOSFET, can you review the design is meet the expected or not?

also can we use the Rext=220k and Cext=22uF value for the design ? is any design max limitation of the Rext and Cext ? thank you

CD4007UB: TI* CD4007UBMT issue and question

Minty Ye — Tue, 16 Jun 2026 13:40:19 GMT

Part Number: CD4007UB

We used this part* CD4007UBMT when we were designing before, but now the TI website shows that this part CD4007UBMT has been obsoleted. And the others in the same series are still available.

Could we directly use CD4007UBM96 or CD4007UBM96.A from the same series? Because looking at the specifications and the marking, they are actually the same parts.

I would like to know if the obsoletion of CD4007UBMT was due to the reason of ROSH? thanks!

TXS0108E-Q1: Inquiry regarding the operational characteristics of the TXS0108E

DAEPYO HWANG — Tue, 16 Jun 2026 10:48:06 GMT

Part Number: TXS0108E-Q1
Other Parts Discussed in Thread: TXS0108E

Hello.

"I am currently using a TXS series level shifter for I2C communication between an AP and an MCU.
As shown in the waveform I’ve provided, there is a phenomenon where the signal stays at approximately 800mV for about 8ns during the falling edge.
This behavior persists even after removing the external 2.2K pull-up resistors, but disappears when I pull the TXS OE pin to LOW.
What could be the cause of this? Will this phenomenon affect I2C communication, and is it safe to continue using this product?

I have one additional question regarding UART communication, for which I am also using a TXS series device. When I insert a 100-ohm damping resistor between the AP (UART TX) and the A-port, the same phenomenon—the signal holding at a specific voltage level—occurs. Replacing it with a 0-ohm resistor resolves the issue. Can I not use damping resistors with this device?

I would appreciate your confirmation on these issues. Thank you."

SN74LVC2T45: The FMEDA file for SN74LVC2T45

Zhang Liang — Tue, 16 Jun 2026 10:23:33 GMT

Part Number: SN74LVC2T45

Hi,

Customer need us to provide the FMEDA file for SN74LVC2T45DCUR, can you help to provide it to my email: liang.zhang@arrow.com, thanks.

SN74LVC2G04: SN74LVC2G04YZPR About the pin assignment

TAKU NAKAJIMA — Tue, 16 Jun 2026 07:50:23 GMT

Part Number: SN74LVC2G04

Could you please provide the correspondence between the package outline ball positions (A1, A2, B1, B2, C1, C2) and the pin numbers (pin names) for the SN74LVC2G04YZPR?

TXS0102: DC Analysis data for digital switching level.

Suraj Singh — Tue, 16 Jun 2026 07:10:57 GMT

Part Number: TXS0102

Hi,
Planning to use Level translator for MDC and MDIO line having phy side (VCCA 1.8v) and (VCCB 3.3v).If we consider datasheet value for VOL,VIL,VIH,VIL then VOH,VIH,VIL, it is failing at PHY side.Attaching the datasheet snip.

But there is a guide documnet for TXS series translators and there we have different value for VOH,VOL,VIL,VIH. With thses guide doc, DC analysis is getting passed for all.Attaching the snip and link for reference. GUIDE DOC LINK

Please clarify which one to consider for DC analysis?

CD74HC4015: [EXTERNAL] External Need MSL for TEXAS INSTRUMENTS

Thilaga Selvamani — Tue, 16 Jun 2026 06:02:13 GMT

Part Number: CD74HC4015

Hello Respected

This is Thilaga from Flex
We are currently working with one of our manufacturing plants to collect below information

Site: Zhuhai

Please provide us the MSL data for the below parts

MPN	MFR_DSCA	MSL
CD74HC4053PW_	TEXAS INSTRUMENTS
CD74HC4053PW_G4	TEXAS INSTRUMENTS
DDC3512ZWR	TEXAS INSTRUMENTS
LM5148RGY	TEXAS INSTRUMENTS
LM654A2FRZYRQ1	TEXAS INSTRUMENTS
LM654B0TFVDARQ1	TEXAS INSTRUMENTS
MSP432P401VIRGCR	TEXAS INSTRUMENTS
MSP432P401VIRGCR(OBS)	TEXAS INSTRUMENTS
MSP432P401VIRGCT	TEXAS INSTRUMENTS
PDDC3512ZWR	TEXAS INSTRUMENTS
TLV3401IDBVRG4	TEXAS INSTRUMENTS
TLV62569PDDC	TEXAS INSTRUMENTS
TPS16850VMAR	TEXAS INSTRUMENTS

Thank you!!

SN74LVC2G74: G4 suffix impact on SMT

Terry Hu — Tue, 16 Jun 2026 05:22:30 GMT

Part Number: SN74LVC2G74

Hi Team,

Customer has shortage of SN74LVC2G74DCTR and consider to change to SN74LVC2G74DCTRG4.

For the lead finish, one is SN, another is NIPDAU. What's the impact on SMT reflow for this difference?

Best regards,

Terry

SN74AVC2T244: Voltage Level Translator Outputs External OR Connections

Emmanuel Mercado — Mon, 15 Jun 2026 17:59:28 GMT

Part Number: SN74AVC2T244
Other Parts Discussed in Thread: SN74AVCH1T45,

Can I connect the outputs of several translators as an external "OR" gate using 1kOhm resistors?

How much current can the outputs sink when one of the outputs goes high?

Note the diagram is for SN74AVCH1T45, but I will be using SN74AVC2T244

LSF0102: LSF VREFB control from 3.3V GPIO

spandana SP — Mon, 15 Jun 2026 15:23:30 GMT

Part Number: LSF0102

Hi,

We are planning to drive VREFB using a 3.3V GPIO, as suggested in the datasheet.

In our application, VREFA will be powered first, and VREFB will be driven later via the GPIO. As there is no specific power sequencing requirement mentioned, we would like to clarify the following:

Is the condition VREFB ≥ VREFA + 0.8V applicable only when the device is enabled (EN = 1)?
Or does this requirement also need to be maintained when the device is disabled (EN = 0)?

Could you please confirm the expected behavior in this scenario, particularly when VREFA is present while VREFB is not yet driven?

SN74AVC4T774: Regarding Level Shifting of SN74AVC4T774

Kyohei — Mon, 15 Jun 2026 09:44:18 GMT

Part Number: SN74AVC4T774

Hi team,

Is it acceptable to use the SN74AVC4T774 with the following supply voltages on the A-side and B-side?

VCCA = +3.3V
VCCB = +1.8V

In the "Typical Application Circuit" shown on page 2 of the datasheet, VCCA is +1.8V and VCCB is +3.3V. However, since both VCCA and VCCB have a recommended operating range up to 3.6V, we believe there should be no issue with this configuration.

Could you please confirm this?

Best regards,

Kyohei

CD4013B: REMINDER - HEMERIA [140-052026] - SU2102-0013 - TEXAS INSTRUMENTS FRANCE

Elise RUPAIRE — Mon, 15 Jun 2026 07:23:28 GMT

Part Number: CD4013B

Hello,

I would like to follow up on our request, as HEMERIA is still awaiting your response. In order to meet our internal deadlines, we would appreciate it if you could provide the requested information by June 18.

Could you please check, complete and/or correct the Excel file.

In order to clarify the status of the relevant part numbers, could you please confirm whether you still have the capability to manufacture these products (yes / no) and specify the manufacturing status:

Active
Obsolete
LBO (Last Buy Order)
Unknown

If the product is active, please provide the following information:

Manufacturing continuity: low (< 2 years) / medium (2–5 years) / high (> 5 years)
RoHS and REACH compliance: compliant / non-compliant / compliant with exemption
ECCN code (Export Control Classification Number)
Repairability: yes / no
Associated datasheet

If the product is obsolete, please indicate, where applicable, the replacement part number.

Reference	Designation	REPONSE
TL431MJG	MA 431 DIL8/C -55+125 C REG.POS.VAR
CD4013BMJ	ML 4013B DIL14/C -55+125 C BASCULE D x2
CD4023BMJ	ML 4023B DIL14/C -55+125 C NAND 3E x3
CD4060BMJ	ML 4060B DIL16/C -55+125 C CPT BIN+OSCIL
CD4066BMJ	ML 4066B DIL14/C -55+125 C INTER BID. x4
CD4093BMJ	ML 4093B DIL14/C -55+125 C TRIGG.NAND x4

Thank you in advance for your support, and please do not hesitate to contact us if you require any further information.

Best regards,

SN74AHC1G08-Q1: tpd, tplh , tphl min max and typical value at 5V

Pranjali Andhare — Mon, 15 Jun 2026 06:54:04 GMT

Part Number: SN74AHC1G08-Q1

Hi, can you please provide

1)tpd min typ max value at 5V , 25°C ,85°C ,125°C

2)tplh min typ max value at 5V , 25°C ,85°C ,125°C

3)tphl min typ max value at 5V , 25°C ,85°C ,125°C

SN74LVC541A-EP: Max Frequency Clarification

Daniel Connolly-Taylor — Fri, 12 Jun 2026 11:12:28 GMT

Part Number: SN74LVC541A-EP
Other Parts Discussed in Thread: SN74LV595A, SN74AHC595

Dear TI Support,

We're looking to use a 80MHz clock for this register with our Vcc at 3.3V. Looking at the suitability of your part we were unable to determine if it could handle this or not via your datasheet. We saw this section here which we weren't sure what to make of this table regarding the min value of the max frequency. If you could clarify if this is a use case for this part that works please let us know.

www.ti.com/.../sn74hcs595.pdf

SN74LVC2G17-Q1: VIH,VIL value for VCC=5V

Pranjali Andhare — Fri, 12 Jun 2026 10:37:07 GMT

Part Number: SN74LVC2G17-Q1

Hi Can you please provide

1) typical , min and max value for VIH and VIL for VCC-5V

2) tplh and tphl values

SN74AHC74: SN74AHC74

Masanori Yachi — Fri, 12 Jun 2026 08:50:53 GMT

Part Number: SN74AHC74

I am using Google Translate.

I apologize if it's rude to ask about comparisons with other companies' devices, but please tell me.

I switched from a Toshiba 74VHC74FT to a TI SN74AHC74, and when I evaluated it without changing the damping resistor connected to the output, the undershoot was slightly larger.

Could you please tell me if this is due to variations in the SN74AHC74 or if it's because the internal impedance of the SN74AHC74 has changed?

(The specifications are almost identical according to the datasheet, so I couldn't determine this.)

SN74LVC2G126: SN74LVC2G126 - PSpice model error

Josel Go — Thu, 11 Jun 2026 16:31:03 GMT

Part Number: SN74LVC2G126

Hello,

I found an error in your Spice model for the SN74LVC2G126.

The error results in a divide by zero error when simulating the model.

Starting at line 186 of SN74LVC2G126.lib:

.SUBCKT LOGIC_TRI_STATE_OUTPUT_LVC_1i_AND_Tristate_CMOS_SN74LVC2G126 IN OUT OEZ VCC VEE
EROH NROH VEE TABLE {V(VCC,VEE)} =
+(1.65,112.5)
+(2.3,50)
+(3,37.5)
+(3,29.1666666666667)
+(4.5,21.875)
EROL NROL VEE TABLE {V(VCC,VEE)} =
+(1.65,112.5)
+(2.3,37.5)
+(3,25)
+(3,22.9166666666667)
+(4.5,17.1875)

There are double 'x' values of 3 in these two tables.

I assume the second line entry is meant to be 3.3.

I cannot make this model change using PSPICE for TI and run a simulation; as once changed, the edited model is treated like a 3rd party part and exceeeds the limititations of the free licence.

Can I be provided an updated model with accompanying .libsig

Regards,

Josel

SN74LV14A: Data request from Flex

Manikandan M — Thu, 11 Jun 2026 15:04:33 GMT

Part Number: SN74LV14A

Hi Team,

Good day,

For this Below mentioned MPN is Obsolete kindly provide the replacement MPN.

SN74LV14APW

For this MPN knidly provide the below details.

MPN	Correct orderable MPN	MPN Life cycle Phase	Carrier Type	Orientation	Part Marking	MSL
ULQ2003ADR

For this MPN kindly provide the correct orderable MPN for below MPN

MPN	Correct orderable MPN
ULQ2003AQDRQ1-TR

Thank you,

SN74LVC1G08-EP: What is the junction-to-case (bottom) thermal resistance for the SN74LVC1G08MDCKREP?

Beverly Lesser — Thu, 11 Jun 2026 14:52:27 GMT

Part Number: SN74LVC1G08-EP

The datasheet for SN74LVC1G08MDCKREP lists junction-to-ambient thermal resistance, but I am looking for junction-to-case. Is that information available? Thank you.

TMUX1308-Q1: TMUX1308-Q1: High voltage level is applied on Data input of TMUX1308 when VCC=0V, what is the upper limit for leakage current?

Hou Fangxi — Thu, 11 Jun 2026 03:31:41 GMT

Part Number: TMUX1308-Q1
Other Parts Discussed in Thread: TMUX1308, , TMUX1309-Q1

When system don't power on completely, VCC of TMUX1308 is not available and high voltage level(5V) is applied on data input pin. Leakage happen under such scenario.

In normal work condition, VCC=5V.

What the uppler limit for leakage current from data pin to chip?

Thanks!

SN74HCS151-Q1: High voltage level is applied on Data input of SN74HCS151 when VCC=0V, what is the upper limit for leakage current?

Hou Fangxi — Thu, 11 Jun 2026 03:18:48 GMT

Part Number: SN74HCS151-Q1
Other Parts Discussed in Thread: SN74HCS151

When system don't power on completely, VCC of SN74HCS151 is not available and high voltage level is applied on data input pin. Leakage happen under such scenario.

What the uppler limit for leakage current from data pin to chip?

Thanks!

SN74AUC07: Junction Temperature

Michelle Qiu — Wed, 10 Jun 2026 17:55:43 GMT

Part Number: SN74AUC07

Hi, the SN74AUC07RGYR datasheet specifies an operating temperature of 85C. We are running thermal simulations where we can simulate the junction temperature of this part, but the board temperature is above 85C. Is there any specification for the max operating junction temperature for this part?

Thanks,

Michelle

LSF0108: voltage conversion

GARETH OU — Wed, 10 Jun 2026 15:48:02 GMT

Part Number: LSF0108
Other Parts Discussed in Thread: SN74LV4066A

I'd like to ask you about the voltage conversion of TI LSF0108RKSR level transducer. Can it perform a smooth 3.3V <-> 3.3V voltage conversion (pull-up to 3.3V on both sides)? Because the datasheet and application descriptions don't specifically mention whether it can or cannot. If it can, do you have a diagram for reference?

TXS0101-Q1: TXS0101 Status of Internal Pullup During Boot/OE Disable

aozer — Wed, 10 Jun 2026 14:19:29 GMT

Part Number: TXS0101-Q1
Other Parts Discussed in Thread: TXS0101

Hello,

We are using the TXS0101 for an open drain application. For our application, the IO connected to the TXS0101 need to have a pullup resistance of 8k during boot up. During boot up, when OE is disabled, is the internal 10k resistor still present on the IOs?

I am trying to figure out if during this boot time I should plan to put a 40k in parallel with the internal 10k to achieve 8k, or if the internal 10k will be disabled and I can just put an external 8k.

Regards,

Adrian