Kt Kingtronics Difference Between SMA, SMB and SMC Packaging

SMA, SMB , SMC are common packaging for SMD diodes.
Their appearances are similar, but what's the difference between them?

SMA/DO-214AC
SMB/DO-214AA
SMC/DO-214AB

1> Size: SMA < SMB < SMC

Kt-Kingtronics-SMA-SMB-SMC-Packaging.jpg

2>Cost: SMA < SMB < SMC
The price for SMA packaging will be the lowest one while the SMC requests the highest cost !
Thus, SMA and SMB would be the priority for customers if they can used both SMA & SMB or SMB & SMC.

Kingtronics Example:

Diode Rectifier

RS2A SMA T&R Rohs Qty: 3kkpcs Unit Price: US$0.0145/pc
RS2A SMB T&R Rohs Qty: 3kkpcs Unit Price: US$0.0154/pc

ES3A SMB T&R Rohs Qty: 3kkpcs Unit Price: US$0.0245/pc
ES3A SMC T&R Rohs Qty: 3kkpcs Unit Price: US$0.0307/pc

Kingtronics-Kt-Diodes-SMA-SMB-SMC-Packaging.jpg

Kingtronics-KKT-SMD-3mm-Ceramic-Trimmer-Capacitor