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TMP390: TMP390 Current consumption

Part Number: TMP390

I require a 0C temperature switch with very low standby power consumption. I have built the single channel cold trip-point circuit from the datasheet (Fig 8-7) with RSET as 21.5k for a 0deg threshold and 5deg hysteresis.

When measuring current draw, the part is consistently drawing above 300uA - much higher than specified 0.5 uA.

Can the TMP390 reach the quoted low-current in this application? Have I missed something?