X-Received: by 10.31.92.211 with SMTP id q202mr2481047vkb.0.1495889503475; Sat, 27 May 2017 05:51:43 -0700 (PDT) MIME-Version: 1.0 Path: csiph.com!feeder.erje.net!2.us.feeder.erje.net!newspeer1.nac.net!border2.nntp.dca1.giganews.com!nntp.giganews.com!l39no521424qtb.0!news-out.google.com!l19ni964qtf.1!nntp.google.com!peer02.iad!feed-me.highwinds-media.com!news.highwinds-media.com!spln!extra.newsguy.com!newsp.newsguy.com!drn From: Winfield Hill Newsgroups: sci.electronics.design Subject: Re: Can we PLEASE stop using these shitty symbols? Date: 27 May 2017 05:51:28 -0700 Organization: Rowland Institute Lines: 37 Message-ID: References: <0gigichepviqb0efjf0a94fs1gi9h36rcb@4ax.com> NNTP-Posting-Host: p6947610d56ac18e3530d65793dcc9038a8c1c0e33ffd7020.newsdawg.com User-Agent: Direct Read News 5.60 X-Received-Bytes: 2062 X-Received-Body-CRC: 1621898542 Xref: csiph.com sci.electronics.design:461981 Tim Williams wrote... > > Winfield Hill wrote .. >> Jim Thompson wrote... >>> >>> I've never seen that style of symbol on a datasheet. >>> Examples? >> >> LP5907, rev l, section 7.2 Date: 2012 >> OPA192, rev a, Figure 43. Date: 2013 >> OPA192, rev e, Figure 63. >> OPA197, Figure 50. >> OPA2325, rev e, Figure 47, 49. >> SM72295, rev e, front page (shows external MSOFETs) >> LMV7235, NSC version, page 2. Date: 2001 >> LMV7235, rev n, section 8.2 Hah, with p-channel circle >> >> That's an LDO, some opamps, an H-bridge and a >> comparator. Just skinning the surface. > > Hah! LP5907 shows a diode junction going into a > channel, with an antiparallel diode across it! > > Which one is it? Apparently it's a diode both ways! :-D No, it's done correctly. The arrow on the FET is for current-flow direction and tells us this is a p-channel FET acting as the pass transistor. The body diode is correctly shown. If the input falls below the output, the diode will conduct. Adding a diode like this is often recommended for other IC regulators, so it's useful to know one is included. -- Thanks, - Win