How does one read the parameter “Voltage supply” for opamps at Digikey?

At Digikey, one parameter is "Voltage - Supply, Single/Dual (±)". Picking a few random opamps, they show these values:

1.8 V ~ 5.25 V, ±0.9 V ~ 2.625 V
3 V ~ 18 V, ±1.5 V ~ 9 V
3 V ~ 30 V, ±1.5 V ~ 15 V


I'm unsure how I should read this values.

For the third example, does it mean that I can - for a single opamp - feed it anything between 3-30VDC (with respect to ground)?

For a dual opamp in the second example, I must feed anything between -1.5 - 9V (with respect to ground)?

As you can see I am very confused here. Any suggestions accpreciated.

EDIT I'm comparing opamps. There's no way I can read the datasheets for 400+ devices. I'm trying to find one I can feed +12V to, so I have to narrow the list a bit, but I don't understand Digikey's number representation.

• What does the specific parts data sheet say... – Trevor_G Jan 20 '18 at 13:43
• I do not understand what you mean by this bit "For a dual opamp in the second example, I must feed anything between -1.5 - 9V" – Trevor_G Jan 20 '18 at 13:54
• "Voltage - Supply, Single/Dual (±)" means single or dual Supply Voltage, not single/dual opamp package. – brhans Jan 20 '18 at 14:15