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Product details

Parameters

Continuous current (Max) (A) 20 Isolation working voltage VIOWM (rms) (V) 71 Sensitivity (Typ) (mV/A) 50, 100, 200, 400 Sensitivity error (%) 0.9 Sensitivity error drift (+/-) (Max) (ppm/°C) 105 Input offset current (+/-) (Max) (mA) 40 Input offset current drift (+/-) (Typ) (µA/°C) 0.2 Features Internal Zero Current Reference Voltage Small signal bandwidth (kHz) 80 Supply voltage (Max) (V) 5 Supply voltage (Min) (V) 3 Iq (Max) (mA) 5 CMTI (kV/µs) 50 open-in-new Find other Hall-effect current sensors

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 open-in-new Find other Hall-effect current sensors

Features

  • Total error: ±1% typical, ±3% maximum, –40°C to 125°C
    • Sensitivity error: ±0.9%
    • Offset error: 40 mA
    • Offset drift: 0.2 mA/°C
    • Linearity error: 0.5%
  • Multiple sensitivity options:
    • TMCS1108A1B/U: 50 mV/A
    • TMCS1108A2B/U: 100 mV/A
    • TMCS1108A3B/U: 200 mV/A
    • TMCS1108A4B/U: 400 mV/A
  • Zero drift internal reference
  • Bidirectional and unidirectional current sensing
  • Operating supply range: 3 V to 5.5 V
  • Signal bandwidth: 80 kHz
  • Robust 100-V galvanic isolation
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Description

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

The input current flows through an internal 1.8-mΩ conductor that generates a magnetic field measured by an integrated Hall-effect sensor. This structure eliminates external concentrators and simplifies design. Low conductor resistance minimizes power loss and thermal dissipation. Inherent galvanic insulation provides a 100-V functional isolation between the current path and circuitry. Integrated electrical shielding enables excellent common-mode rejection and transient immunity.

The output voltage is proportional to the input current with multiple sensitivity options. Fixed sensitivity allows the TMCS1108 to operate from a single 3-V to 5.5-V power supply, eliminates ratiometry errors, and improves supply noise rejection. The current polarity is considered positive when flowing into the positive input pin. Both unidirectional and bidirectional sensing variants are available.

The TMCS1108 draws a maximum supply current of 6 mA, and all sensitivity options are specified over the operating temperature range of –40°C to +125°C.

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Technical documentation

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Type Title Date
* Data sheet TMCS1108 3% Functional Isolation Hall-Effect Current Sensor With ±100-V Working Voltage datasheet (Rev. A) Jul. 01, 2021
User guide TMCS1108EVM User's Guide Dec. 04, 2020
Application note Thermal Implementation Guide for In-Package Magnetic Current Sensors Jul. 12, 2020
White paper Improving Performance in High-Voltage Systems With Zero-Drift Hall-Effect Curren Jun. 29, 2020
Application note Precision Designs with Non-Ratiometric Magnetic Current Sensors Jul. 01, 2019
Application note Low-Drift, Precision, In-Line Isolated Magnetic Motor Current Measurements Apr. 15, 2019

Design & development

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Hardware development

EVALUATION BOARD Download
document-generic User guide
59
Description

The TMCS1108EVM is intended to facilitate rapid, convenient use of the TMCS1108, an isolated Hall-effect precision current sense monitor utilizing an internal ratiometric reference. This evaluation module (EVM) allows the designer to push the max operating current through the Hall-input side while (...)

Features
  • Evaluation of the TMCS1108Ax in all gain options                                                                                                                                                                   
  • Test points to allow ease of access to device pins                                                                                                                                                                    
  • Large copper planes to help with heat dissipation                                                                                                                                                                   
  • Large lug connectors to connect the EVM to large current carrying leads

Design tools & simulation

SIMULATION MODEL Download
SBOMBO3.ZIP (195 KB) - PSpice Model
SIMULATION MODEL Download
SBOMBO7.ZIP (195 KB) - PSpice Model
SIMULATION MODEL Download
SBOMBO8.ZIP (195 KB) - PSpice Model
SIMULATION MODEL Download
SBOMBO9.ZIP (195 KB) - PSpice Model

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options

Ordering & quality

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