TI TMCS1108A3UQDR

The TMCS1108 is a galvanically isolated Hall-effect current sensor capable of measuring DC or AC current with high accuracy, excellent linearity, and temperature stability. A low-drift, temperature-compensated signal chain achieves <3% full-scale error across the device's operating temperature range.

Input current flows through an internal 1.8mΩ conductor, and the resulting magnetic field is measured by an integrated Hall-effect sensor. This architecture eliminates the need for an external concentrator and simplifies design. The low conductor resistance minimizes power loss and heat dissipation. Inherent plated isolation provides 100V functional isolation between the current path and circuitry. Integrated electrical shielding delivers excellent common-mode rejection and transient immunity.

The output voltage is proportional to the input current, with multiple sensitivity options available. Fixed sensitivity allows the TMCS1108 to operate from a single 3V to 5.5V supply, eliminating ratiometric error and improving power supply noise rejection. Current polarity is considered positive when current flows into the positive input pin. Both unidirectional and bidirectional sensing variants are available.

The TMCS1108 draws a maximum supply current of 6mA, and all sensitivity options are rated for an operating temperature range of -40°C to +125°C.

• Total error: typical ±1%, maximum ±3%, -40℃ to 125℃
• Sensitivity error: ±0.9%
• Offset voltage error: 40mA, temperature drift 0.2mA/℃
• Linearity error: 0.5%
• Multiple sensitivity options
• Zero-drift internal reference
• Bidirectional and unidirectional current sensing
• Operating supply voltage range: 3V to 5.5V
• Signal bandwidth: 80kHz
• Robust 100V galvanic isolation

• Motor and load control
• Inverter and H-bridge current measurement
• Power factor correction
• Overcurrent protection
• DC and AC power monitoring