View source for Dtech DT-9011 RS-232 Isolator

== Overview ==

Chinese bus powered ("passive") RS-232 isolator.

== Bill of Materials ==

{| class="wikitable"
! Name
! Package
! Marking
! Description
! Link
|-
| R1-R2
| 122
| 0805
| 1.2kΩ resistor
|-
| C1-C6
| 3528 ("B")
| 106C 504F2
| 10μF tantalum
|-
| Q1-Q2, Q4, Q6-Q8
| SOT-23
| LD3 v
| BAT54 Schottky diode maybe?
|-
| Q3, Q5
| SOT-23
| LD3 6
| BAT54 Schottky diode maybe?
|-
| U1-U2
| SOIC-8
| M?r?ne MB??660C  1940
|-
| U3-U6
| SO-6 (4 leads)
| [Toshiba Logo] 747 P185 GR J0
| Toshiba TLP185
| [https://www.digikey.com/product-detail/en/toshiba-semiconductor-and-storage/TLP185-GR-TPR-E/TLP185-GR-TPRE-CT-ND/3025457 Toshiba TLP185(GR-TPR,E)]
|}

U1 and U2 have their markings partially ground off. The company logo appears to start with a cursive M and end with a cursive e, and it might be a LMC7660/ICL7660/TC7660/TL7660 charge pump.

The board has edge soldered connectors similar to these:

[https://www.digikey.com/product-detail/en/amphenol-icc-commercial-products/L717SDE09PVF/L717SDE09PVF-ND/4886813 Amphenol L717SDE09PVF]

[https://www.digikey.com/product-detail/en/assmann-wsw-components/A-DF-09-LL-Z/AE11063-ND/5051922 Assmann A-DF 09 LL/Z]

== Online Resources ==

[https://www.dtechelectronics.com/dtech-dt-9011-passive-rs232-photoelectric-isolation-protector_p90.html DTECH DT-9011 Passive RS232 Photoelectric Isolation Protector,Industrial Ethernet Serial Converter]

[https://www.dtechelectronics.com/industrial-serial-converter_c21 HDMI Matrix,DVI Splitter,Guangzhou Dtech Electronics Technology Co.,Ltd.]

[http://www.imaginart.es/audiovisuales/dtech/pdf/Catalogo_Dtech_conversores_industriales.pdf Dtech Industrial Converter Catalog]

[http://ww1.microchip.com/downloads/en/AppNotes/00782a.pdf Microchip AN782 TC7660 Powers RS-232 Data Loop Low Cost Adapter (DS00782A)] (possibly relevant application note)