ZeptoBars - RSS feed http://zeptobars.com/en/ Microelectronics. Die-shots. Artificial intelligence. Lasers. en-us Tue, 10 Jun 2006 04:00:00 GMT Tue, 17 Oct 17 06:47:26 +0300 webmaster@zeptobars.com 120 10 <![CDATA[Philips NE5532A : weekend die-shot]]> http://zeptobars.com/en/read/Phillips-NE5532A-opamp-audio genuine Ti NE5532 than to fake.

Tue, 03 Oct 17 11:36:12 +0300
<![CDATA[Ti NE5532 - real vs fake : weekend die-shot]]> http://zeptobars.com/en/read/Ti-NE5532-real-vs-fake-opamp
Genuine Ti NE5532 has die size of 2103x2154µm.

Fake Ti NE5532 is much smaller and have much simpler design. Bare minimum to operate as opamp:

SnipTheCat at EEVBlog forum noticed that these have much slower slew rate vs datasheet.

This IC was from one of these "Ti NE5532 100pcs for 4$" ebay lots. On the back side it was marked as "Tdsemic", which probably means it was manufactured/packaged at 拓电半导体(香港)有限公司 (TD SEMICONDUCTOR LIMITED.).
Tue, 03 Oct 17 10:21:50 +0300
<![CDATA[ST TSC1031IDT 70V high-side current sense amplifier : weekend die-shot]]> http://zeptobars.com/en/read/STM-TSC1031IDT-high-voltage-high-side-current-sense-amplifier STMicroelectronics TSC1031 allows to amplify differential signal with high common-mode voltage (up to 70V) while having low VCC (2.7 to 5.5V) which is very useful for high-side current sensing.

Die size 422x437 µm.

Sun, 17 Sep 17 17:22:30 +0300
<![CDATA[Ti TLC5540I 8bit 40MSPS semiflash ADC : weekend die-shot]]> http://zeptobars.com/en/read/Ti-TLC5540I-8bit-40MSPS-ADC-semiflash Ti TLC5540I is a CMOS semi-flash 8bit 40MSPS ADC. Die is much smaller than simple 8bit flash ADC.

Die size 1699x1801 µm, 1µm minimum half-pitch.

Core at higher resolution:

Closer look at resistor matrix. Not much is visible through 2 metals:

Mon, 24 Jul 17 01:25:47 +0300
<![CDATA[Fairchild LM555CMX : weekend die-shot]]> http://zeptobars.com/en/read/Fairchild-LM555CMX-555

Sun, 23 Jul 17 20:31:48 +0300
<![CDATA[Fairchild BCV27 - npn darlington BJT : weekend die-shot]]> http://zeptobars.com/en/read/Fairchild-BCV27-npn-darlington-bjt Fairchild BCV27 - is a tiny SOT-23 Darlington npn BJT with hFE of 20'000.
Die size 612x611 µm.

Sat, 08 Jul 17 06:44:49 +0300
<![CDATA[Ti NE555 - real vs fake : weekend die-shot]]> http://zeptobars.com/en/read/Ti-555-NE555-real-vs-face-china-chinese fake 80$ "audiophile-grade" opamp. But why would someone fake one of the cheapest microchips in the world?

With volumes high enough that's still decent money for a small company. It could also be an economic warfare: each fake chip sold means 7 cents less in US GDP and Ti sales.

Genuine Ti NE555D. This one is directly from distributor. You can see several mentions of Texas Instruments on the die.
I really like designs with pads in the middle of the die, it looks so elegant and efficient (when it's not reducing yield).
Die size 1034x762 µm.

First fake 555 timer marked as Ti NE555 from ebay:

Different fake 555 design marked as Ti NE555 found on ebay:
Die size 747x762 µm.

Update: microcolonel was first to realize that this G1083 die is exactly the same, as the one we've decapped as HA17555. That means our HA17555 was also fake. These fakes are getting convoluted.

Obviously, basic functionality is the same, but parameters limits and their tolerances are unknown.
If you're not reaching for the limits (like max VCC or precision) and have some luck - that might not cause issues.

Looking at these designs one can see that routing in Chinese designs is very "intense": they are squeezing every fraction of a cent in die manufacturing cost.

That not necessary means that Chinese designs are superior : in genuine analog circuits precision, tolerances and noise are much more important than die size. But there is no doubt that these Chinese designs have reached lowest possible manufacturing cost for a 555. If only have they marked it "CN555" with proper data-sheet - it would have been totally legitimate and fair product. ]]>
Mon, 03 Jul 17 05:55:50 +0300
<![CDATA[BTR004K - heart of Batteriser/Batteroo : weekend die-shot]]> http://zeptobars.com/en/read/BTR004K-Batteriser-Batteroo-switched-capacitor-boost-dcdc BTR004 chip. This is a boost DCDC chip with external capacitors and inductors.

Chip itself is not all that dumb - it's a custom job (see BTR004K marking at the top left corner), with very low quiescent current and apparently able to drive large range of loads.

More than half of the chip area is occupied by 4 MOSFETs. Most likely they are connecting SW1/SW2 pins to ground/output - so we have SW1->ground, SW1->VO1, SW2->ground, SW2->VO2 MOSFETs. Looks like synchronous 2-phase boost converter.

While Batteiser/Batteroo as a product itself is almost never useful (with rare exceptions of badly designed electronic goods consuming low current with unusually high cut-off voltage and/or absolutely no or very bad voltage regulation), chip itself could have been useful as a standalone product, especially if higher output voltages were available. Technologically it's quite advanced product spoiled by marketing and product placement.

Die size 1267x749 µm.

Thanks for the chips to DextersLab2013 (blog, YouTube), guys at EEVBlog forum and of course David Jones for rising this issue in the first place.]]>
Fri, 30 Jun 17 09:11:33 +0300
<![CDATA[ST 2STD1665 - power NPN BJT : weekend die-shot]]> http://zeptobars.com/en/read/ST-2STD1665-NPN-BJT ST 2STD1665 have quite outstanding hFE of 320 (for a non-darlington 65V power BJT). That makes it very useful for switching applications where you wish to drive it with low voltage (e.g. pin of microcontroller with 1.8V VCC) where N-MOSFET would require external circuitry.

You can see extensive net to stitch thin, high-resistance base with metal. Emitter resistance could have been slightly lower with different pad placement (closer to center and on the diagonal) but apparently it's not a major performance-limiting factor.

And... it's just beautiful!

Die size 1740x1727 µm.

Thu, 29 Jun 17 00:21:35 +0300
<![CDATA[1107PV2 - 20MHz 8bit Soviet flash ADC : weekend die-shot]]> http://zeptobars.com/en/read/1107PV2-20MHz-8bit-flash-ADC-soviet

Closer look at comparators:

Sun, 30 Apr 17 12:24:26 +0300