WEE Technology Company Limited
Manufacturer of Surface Mount (SMD) and Through Hole (DIP) Diodes & Rectifiers

The SMAJ series is a type of Transient Voltage Suppressors, which is designed specically to protect sensitive electronic equipment from high voltage transients, such as lightning and other transient voltage events.

The SMAJ here is a type number , but not a package type name, which is different from the SMA-J (DO-214AC) diodes.

DO-214 is a standard that specifies a group of semiconductor packages for surface mounted diodes.
DO-214AA, also known as SMB, is the middle size.
DO-214AB, also known as SMC, is the largest size.
DO-214AC, also known as SMA, is the smallest size.
DO-214AC, also known as SMAD and SMA-J, which has different terminal from SMA

https://www.weetcl.com/Schottey_Barrier_Rectifiers/SMAJ_SS22_THRU_SS210.html

SMA-J (DO-214AC) US1A THRU US1M (US1A, US1B, US1D, US1G, US1J, US1K, US1M) Surface Mount High Efficiency Rectifier
SMA-J (DO-214AC) RS1A THRU RS1M (RS1A, RS1B, RS1D, RS1G, RS1J, RS1K, RS1M）Surface Mount Fast Recovery Rectifier
SMA-J (DO-214AC) ES1A THRU ES1J (ES1A, ES1B, ES1C, ES1D, ES1E, ES1G, ES1J) Ultra-Fast Recovery Rectifiers
SMA-J (DO-214AC ) M1 THRU M7 (M1, M2, M3, M4, M5, M6, M7) General Purpose Plastic Rectifier
SMA-J (DO-214AC) GS1A THRU GS1M (GS1A, GS1B, GS1D, GS1G, GS1J, GS1K, GS1M) General Purpose Plastic Rectifier
SMA-J (DO-214AC) BYG10D THRU BYG10Y (BYG10D, BYG10G, BYG10J, BYG10K, BYG10M, BYG10Y) General Purpose Plastic Rectifier
SMA-J (DO-214AC) S1A THRU S1M (S1A, S1B, S1D, S1G, S1J, S1K, S1M) General Purpose Plastic Rectifier