{{tag>collection_FelineFriendly vendor_bosch year_unknown foundry_unknown tech_unknown}}

====== Description ======
This part was taken from a Motronic M1.7.3 engine control unit (ECU), which was commonly used on 1.6L & 1.8L 4-cylinder BMWs of the mid-E36 generation. While this chip was likely used on a number of ECUs, the specific one in this case had Bosch PN 0 261 203 661.

Functionally, this chip is a 6-element array of TVS diodes connected in parallel with various analog engine sensors' inputs. It provides bipolar protection to the MCU's ADC inputs.

====== Package ======
Label (top):

<code>
30132 (Bosch internal PN)
[Bosch Logo]
136
</code>

{{:felinefriendly:bosch:b30132:s900_pkg.jpg?400|}}

====== Die ======

<code>
Decap Steps:
(Bic lighter + water quench) x 2 cycles
Selective crushing with pliers and bench vise

Capture Details:
Imaging device: Keyence VHX-2000
Magnification: 500X

Markings:
[Bosch Logo]
J52B
CJ52B (likely a reference to the commercial PN used by Bosch)
</code>

Imaged using normal / center lighting:

{{:felinefriendly:bosch:b30132:s900_die_normallight_500x_small.jpg?400|}}


Imaged using edge lighting, for enhanced shadow contrast:

{{:felinefriendly:bosch:b30132:s900_die_edgelight_500x_small.jpg?400|}}

//Note: The metal layer got a little smudged in some places during mechanical decapsulation.

These are ~2X downsampled versions of the original images. Full resolution versions (6-9MB) can be provided. On the to-do list…//