App note from Littelfuse introduces you to their TVS options specifically fit to your circuit protection needs. Link here (PDF)
Transient Voltage Suppression (TVS) protection devices such as shielded cables, crowbars, filters and clamping devices have been widely used for a number of years to solve EMI problems. These TVS devices can be used to achieve higher EMI higher immunity levels without significantly adding to the cost and complexity of the circuit. The attributes of traditional TVS devices will be compared to the features of a relatively new option, the avalanche diode TVS EMI filter. Recent advancements in IC manufacturing technology provide the TVS diode with several technical and cost advantages compared to traditional EMI devices.