Great work, Bob! Thanks for sharing it with us.

A part similar to the last one on your list is the:
AVX PBRC-20.00BR with similar but slightly different specs.  Based on 
what you showed, it probably needs testing to be called equivalent but 
if it works for you, it is slightly less expensive.

Garrett Electronics has it:
http://www.garrettelec.com/cart/cart_add.cfm?part_no=PBRC-20.00BR
with pricing at $0.53/100's.  For people using resonators, price might 
be important enough to try it out.

Bob Blick wrote:
> As promised.
> 
> I've just tested a handful of 20MHz ceramic resonators
> with builtin caps. The board I tested it on has two
> pics, one is connected to the resonator, the other is
> a slave via a 100 ohm resistor from master's OSCOUT to
> slave OSCIN. So it's tougher than your usual single
> PIC setup.
> 
> The good news is, all the resonators I tested worked,
> although I would not use some of them as you will see.
> In case you don't know, these are all overtone
> resonators. The fundamental (6.666 MHz) is
> mechanically suppressed so no tank is required.
> 
> All these resonators are surface mount. Unfortunately
> there is very little standarization in packaging.
> 
> Master PIC is a 16F876A set to HS mode. Slave is a
> 16F877A set to HS mode.
> 
> Scope probe is a Tektronix 6109B 100MHz x10 of unknown
> capacitance, probably somewhere around 11 pF.
> 
> All the resonators are available at Digikey, since
> they are fast and I have an account there :)
> 
> Enjoy the results!
> -Bob
> 
> Panasonic EFJ-C2005E5B (digikey PA200CCT-ND)
> 1.0 mm pitch, marked with weird squiggly code
> $0.41 in 100s
> Starts and runs 
> If started with scope probe attached runs at
> fundamental
> Feedback amplitude lower than output
> 
> ECS ECS-HFR-20.00-B-TR (digikey XC1094CT-ND)
> 1.0 mm pitch, easy to read 20.00
> $0.42 in 100s
> Starts and runs 
> If started with scope probe attached runs at
> fundamental
> Feedback amplitude lower than output
> 
> ECS ECS-CR2-20.00-B-TR (digikey XC1109CT-ND)
> 1.5 mm pitch, marked 20.0M
> $0.42 in 100s
> Starts and runs even with scope attached to either
> lead
> High and balanced amplitude
> 
> Panasonic EFO-BM2005E5 (digikey PX200BCT-ND)
> 1.35 mm pitch, easy to read 20.0
> $0.48 in 100s
> Starts and runs even with scope attached to either
> lead
> Very high and balanced amplitude
> 
> TDK CCR20.0MXC7T (digikey 445-1649-1-ND)
> 1.0 mm pitch, 20 marked by laser hard to see
> $0.42 in 100s
> Starts and runs even with scope attached to either
> lead
> High amplitude, higher on feedback
> 
> Murata CSTCE20M0V53-R0 (digikey 490-1199-1-ND)
> 1.2 mm pitch, tiny metal package, marked in code E.e.
> $0.53 in 100s
> Starts and runs even with scope attached to either
> lead
> Very high and balanced amplitude
> 
> AVX PBRC-20.00HR (digikey 478-2114-1-ND)
> 2.5 mm pitch, marked 20.00Z
> $0.62 in 100s
> Starts and runs even with scope attached to either
> lead
> Very high amplitude, higher on feedback
> 
> --

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