What the 1.2% measurement error means for your BOM
The LTC2947IUFE#TRPBF is a single-phase energy monitor from Analog Devices, communicating over I2C or SPI. Its 1.2% total measurement error covers the full signal chain from the sense resistor through the ADC — you budget that as the worst-case accuracy floor, not a typical. For a 12 V rail at 5 A, that is ±60 mV and ±60 mA at the extremes, which is tight enough for board-level power accounting but not for revenue-grade metering.
Supply range and temperature grade
Operates from 4.5 V to 15 V, covering common 5 V and 12 V rails without an external regulator. The -40°C to 85°C range is industrial grade — suitable for outdoor telecom cabinets, motor drives, and factory-floor enclosures where the ambient can swing. The 6 mA supply current is the IC's own draw; the sense resistor burden adds to the system power budget.
Package and footprint — 32-QFN with exposed pad
Housed in a 32-WFQFN with exposed pad, 4x6 mm body. The exposed paddle must be soldered to a ground plane for thermal and electrical contact — the datasheet's recommended land pattern is non-negotiable for keeping the junction temperature within limits at the full 15 V supply. Surface-mount only.
Active production and packaging options
Analog Devices lists this part as active with ROHS3 compliance. The #TRPBF suffix denotes Tape & Reel packaging; the same die in tube form is LTC2947IUFE#PBF. The reel quantity suits automated pick-and-place for medium-to-high-volume builds; for prototype or low-volume runs the tube variant may be more economical.