I'm looking for a triaxial accelerometer-gyroscope sensor with a very small footprint. I need one about the size of the second joint of the forefinger or slightly smaller. My big hands would make this measurement about 16mm x 38mm or 5/8 of a inch by 1 1/2 inches, in old money. 
I would prefer something smaller.
Good news. RS components shows 18 hits for products that seem to match your criteria and using LGA package to catch your footprint requirement. All of them from ST Microelectronics BTW, so I'd suggest checking out their website and heading into the gyro sensor section to get your favorite flavor of candy (although st.com seems to be down for me at present; should be back up shortly).
How about LSM6D, LM9D, L3GD20...etc.
I had seen the chips before. I'll add a bit of specification at this time.
I'm looking for a triaxial accelerometer-gyroscope sensor with a I2C connectivity and a minimum response of 100hz or better, with a very small footprint. I need one about the size of the second joint of the forefinger or slightly smaller. My big hands would make this measurement about 16mm x 38mm or 5/8 of a inch by 1 1/2 inches, in old money. I would prefer something smaller.
The MPU6050 is 21.2mm (0.84") length x 16.4mm (0.65") width x 3.3mm (0.13") height, which should work I guess. It also uses i2c from what I remember. The mpu9250 is almost identical, but is a better version
Ok Claude, you'll have to help me out here because as far as I can tell, the parts I quoted meet all your requirements if I look at the datasheet, including size (by a huge margin in fact). What's the problem exactly?
Or do you mean you need an off the shelf module, not a chip?
Yes! My bad. Under specified. I don't have the background to design and build a beakout board for the chip you suggest. COTS module is about my level of skill.
On second thought, I might just have to build my own breakout. I don't like the idea and the investment in time may be too large but I will add it to the consider pile for now. thx
Shouldn't be too hard to design a breakout for just this chip. The most minimalistic version would be the chip, 2 capacitors and 4 wires coming out of the pcb.
The constraints of the use case environment limits connectivity to either a hardwired solution of more favorably a Qwiic allowing swapping out of modules.
Any pointers to designing a breakout board with a I2C interface and the MPU6050 would be appreciated.
I searched this forum for "accelerometer" which lead me to Kris Winer/onehorse which lead to tindie.com which has "Wearable MPU9250 Nano Board" which is small enough for my project.
thanks for all the feedback.
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