Relay bypass candidate

[knutolai]

I've been using the Panasonic TQ2-L2-5V for my relay bypasses for years, but they are quite prices and I want to explore other candidates. Skimming through DigiKey I found the AGN relay family (from Panasonic too).

The one I'm most interested in is the AGN210A03Z. It's a 3V, single coil latching relay. In comparison the TQ2-L2-5V is a 5V, dual coil latching relay. These differences are fine for my designs as all I will have to do is change my relay footprint and voltage regulator. I'm more uncertain how the the relays other parameters will affect it's applicability as a bypass relay.  Thoughts?

AGN210A03Z specs:
https://www.digikey.no/product-detail/en/panasonic-electric-works/AGN210A03Z/255-3356-1-ND/6187877

Coil Current   33,3mA    Coil Voltage   3VDC    Contact Form   DPDT (2 Form C)    Contact Rating (Current)   1A    Switching Voltage   125VAC, 110VDC - Max    Turn On Voltage (Max)   2.25 VDC    Turn Off Voltage (Min)   -    Operate Time   4ms    Release Time   4ms    Features   -    Mounting Type   Surface Mount    Termination Style   Gull Wing    Operating Temperature   -40°C ~ 85°C    Contact Material   Silver Palladium (AgPd), Gold (Au)    Coil Power   100 mW    Coil Resistance   90 Ohms

Additionally the switch resistance is max 100mOhm which seems great for audio.

TQ2-L2-5V specs:
https://www.digikey.no/product-detail/en/panasonic-electric-works/TQ2-L2-5V/255-1007-5-ND/251779

Coil Current   40,0mA    Coil Voltage   5VDC    Contact Form   DPDT (2 Form C)    Contact Rating (Current)   1A    Switching Voltage   125VAC, 110VDC - Max    Turn On Voltage (Max)   3.75 VDC    Turn Off Voltage (Min)   -    Operate Time   3ms    Release Time   3ms    Features   -    Mounting Type   Through Hole    Termination Style   PC Pin    Operating Temperature   -40°C ~ 70°C    Contact Material   Silver (Ag), Gold (Au)    Coil Power   200 mW    Coil Resistance   125 Ohms

[PRR]

> AGN210A03Z specs:
> Mounting Type   Surface Mount   
> Termination Style   Gull Wing

You are OK with this mounting? (It would explain some of the price difference.)

[knutolai]

Oh absolutely I do smaller smd stuff regularly. Should probably have specified that in the original post.

[PRR]

Switching audio is an easy task for any relay. (At first-- they often have troubles over the years.)

A relay is an imperfect audio switch, very abrupt, so anti-pop measures may be needed. But that's true for any mechanical switch (even manual/stomp).

I don't see a problem.

[knutolai]

Thank Paul! Looking at the coil current of 33,3mA I should be able to drive the relay coils directly with a ATTiny84 microcontroller (max output current of 40mA per I/O pin). I'll report my findings in a few weeks.

Let me know if anyone's interested in the bypass code (Arduino based for ATTiny).

[knutolai]

So the boards and components arrived and everything works flawlessly. The ATTINY drives the relay coil. The gull wing pins of the relay are very easy to solder. Thanks again PRR for your reassurance