Dtech DT-9011 RS-232 Isolator

Revision as of 23:54, 20 May 2020 by Fdarling (talk | contribs) (added suspected charge pump information)

Overview

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

Bill of Materials

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 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:

Amphenol L717SDE09PVF

Assmann A-DF 09 LL/Z

Online Resources

DTECH DT-9011 Passive RS232 Photoelectric Isolation Protector,Industrial Ethernet Serial Converter

HDMI Matrix,DVI Splitter,Guangzhou Dtech Electronics Technology Co.,Ltd.

Dtech Industrial Converter Catalog

Microchip AN782 TC7660 Powers RS-232 Data Loop Low Cost Adapter (DS00782A) (possibly relevant application note)