I'm trying to understand what the following symbol is for. It's found in this schematic.
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asked Jan 10, 2013 at 17:14
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\$\begingroup\$ I suspect it's a voltage regulator of some sort? \$\endgroup\$– josef.van.niekerkJan 10, 2013 at 17:15
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4\$\begingroup\$ I think I saw that used in this circuit \$\endgroup\$– Phil FrostJan 10, 2013 at 17:25
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2\$\begingroup\$ What it means is the person who drew that schematic is terrible at drawing readable schematic symbols. \$\endgroup\$– Connor WolfJan 11, 2013 at 4:18
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1\$\begingroup\$ @josef.van.niekerk - I think you mean Olimex (They're the people who drew that schematic, and yes, their schematics are pretty much universally horrible). \$\endgroup\$– Connor WolfJan 11, 2013 at 8:08
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1\$\begingroup\$ I'd say this is a component or collection/cluster of components/symbols, not a symbol in and of itself. /librarian \$\endgroup\$– DJGJul 20, 2021 at 20:27
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3 Answers
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This device is a transient voltage suppressor for USB D+ and D- signals. It protects the device from static voltages that may develop when inserting or removing USB devices to connectors.
The four diodes (on side) act as clamping diodes that conduct to suppress ESD.
This or similar device can be found in this Semtech catalog
answered Jan 10, 2013 at 17:38
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\$\begingroup\$ Awesome, that's really clever, I didn't think of ESD at all. \$\endgroup\$ Jan 11, 2013 at 6:51
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Looks like electrostatic discharge (ESD) protection on a USB port. Any port that a user can touch should have protection against finger zaps frying the chip connected to it.
Have a look at the datasheet for TI TPD2E001 to get an idea what the specs might be.
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it is 5 symbols enclosed in one device. 4 normal diodes in a bridge configuration with a zener diode in the middle for simple regulation.
answered Jan 10, 2013 at 17:16
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1\$\begingroup\$ I don't think it's for regulation; more probably over-voltage or ESD protection of some interconnection. \$\endgroup\$– user16324Jan 10, 2013 at 17:19
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\$\begingroup\$ Regardless, it's still 4 diodes in bridge configuration with a Zener in the middle. \$\endgroup\$– dext0rbJan 10, 2013 at 17:24
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\$\begingroup\$ I was going to say, "balanced modulator". I'm glad you guys saved me the embarrassment. I'm going with the USB answers. The "pass-through" design supports that notion. \$\endgroup\$– gbarryJan 10, 2013 at 18:29