LOG112: High reliability requirement

Hello Ke Su,

The LOG amplifiers from the Precision Amplifiers product group, such as the LOG104, LOG112 and LOG114, do not have Mil-Spec versions. There is one LOG amplifier product, the TL441 that does have enhanced performance and military versions, TL441-EP and TL441AM, respectively. These are processed by TI's Hi-Rel Logic products group. 

The TL441 is quite different from that LOG104 - LOG114 in that it is intended for voltage inputs, where as the others are more ideally suited for current inputs. That would indicate that they are intended for quite different applications. 

You can find more about the TL441AM military version here:

Regards, Thomas

Precision Amplifiers Applications Engineering

Is that possible TI Can perform any screening program for LOG112AIDR to remove the outlier and increase the long term reliability?

Thanks,

Ke

Ke,

TI normally only provides additional screening for very high volume requests; if you want to share your target annual consumption forecast of the LOG112 with me (feel free to send me a private message), please feel free to do so if you want to further discuss the possibility of screening shipments. 

However, I want to point you to the LOG112 quality report (see below link), specifically the "Life Test" metric where we subjected a sample size of 77 devices to a constant 125°C temperature conditions and observed zero failures after over 1000 hours of continuous operation. Based on this information, our quality team estimates that, assuming a 60% confidence level and continuous 24-hour operation at 45°C, the mean time to failure of the LOG112 is approximately 20 years. Again, please note this is simply an engineering estimate, and that real-world device performance will vary, but even in non-military grade, we estimate the device will perform very near to your long-term requirements.

LOG112 Qual Report w d.pdf

Thank you for your interest in TI log amplifier products. 

Christopher Stemple

Product Marketing - Precision Amplifiers 

Hi Christopher,

Thanks for attaching the Qual Report.

Few questions regarding the Qual Report.

(1) HTOL test sample size of 77 devices means 77 devices/lot, right? How many lots TI will draw sample from? Each sample is tested 1008 hrs? Will TI continuously collect sample from the different lot, accumulate the device hours and monitor the FIT rate?

(2) ELFR is 17 DPPM, any calculations or testing you could share to derive this number?

(3) I noticed that the assembly site is OSE-Taiwan, is this production line qualified by any automotive or Mill-Spec parts?

I will contact our supply chain and give you the volume information.

Thanks,

Ke

Ke,

1) Yes, HTOL sample size refers to 77 devices/lot. For the LOG112, only one lot was used for HTOL qualification, and each sample was tested for 1008 hours at 125° with no observed failures. No, TI does not continuously collect samples from various lots - we handle potential quality issues on a case-by-case basis whenever a quality issue is suspected.

2) Lifetime reliability equations are largely based on the Arrhenius equation; please refer to the Reliability Terminology page for a full breakdown on the methodology behind the calculations - www.ti.com/.../reliability_terminology.page

3) The Taiwan assembly site does in fact produce AEC-Q100 and mil-spec qualified devices, but those certifications does not apply to all production lines.

Chris

HI Chris,

Could you please give me your contact information? Email and phone? I would like to discuss with you for the screening options.

Thanks,

ke

Ke,

Please feel free to email me at cstemple@ti.com so we can discuss further.

I would appreciate the following information from you:

• Annual volume forecast
• Project production start date
• Specific parameters of interest to be screened
• Any other military requirements outside of 25-year life

Christopher Stemple

Product Marketing - Precision Amplifiers