The datasheet of the SMCJ is completely correct (since 1999, by the way) and guarantees IRM max 500µA (2000µA at 85DEGC) at 5V. You will find similar values with SMCJ5.0A/CA from other vendors as well.
SMBJ are different TVS and provides different values.
Maybe you missed it - the datasheet of the SMBJ does mention how bidirectional / unidirectional is labeled. You will find this information in section 10 (ordering information, page 10):
- CA = Bidirectional
- A = Unidirectional
Good luck!
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/Peter
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