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TMCS1108

ACTIVE

±100V basic isolation, 20Arms 80kHz Hall-effect current sensor with reference

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Data sheet

TMCS1108

ACTIVE
Data sheet Order now

Product details

Continuous current (max) (A) 20 Working isolation voltage (VIOWM) (Vrms) 71 Input offset current (±) (max) (mA) 8, 10, 12, 30 Input offset current drift (±) (typ) (µA/°C) 0.2 Features Internal Zero Current Reference Voltage Supply voltage (max) (V) 5 Supply voltage (min) (V) 3 Iq (max) (mA) 5 Small-signal bandwidth (kHz) 80 Sensitivity error (%) 0.9 Sensitivity error drift (±) (max) (ppm/°C) 105 Rating Catalog Operating temperature range (°C) -40 to 125 Creepage (min) (mm) 4 Clearance (min) (mm) 4 Isolation rating Functional Surge isolation voltage (VIOSM) (VPK) 6000
Continuous current (max) (A) 20 Working isolation voltage (VIOWM) (Vrms) 71 Input offset current (±) (max) (mA) 8, 10, 12, 30 Input offset current drift (±) (typ) (µA/°C) 0.2 Features Internal Zero Current Reference Voltage Supply voltage (max) (V) 5 Supply voltage (min) (V) 3 Iq (max) (mA) 5 Small-signal bandwidth (kHz) 80 Sensitivity error (%) 0.9 Sensitivity error drift (±) (max) (ppm/°C) 105 Rating Catalog Operating temperature range (°C) -40 to 125 Creepage (min) (mm) 4 Clearance (min) (mm) 4 Isolation rating Functional Surge isolation voltage (VIOSM) (VPK) 6000
SOIC (D) 8 29.4 mm² 4.9 x 6
  • 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
  • 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

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.

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) PDF | HTML 01 Jul 2021
Application note Simplify Your Current Sensing Design in Negative Output Power Supply Designs (Rev. A) PDF | HTML 15 Oct 2024
Application brief Introduction to TI Magnetic Sense Simulator Features PDF | HTML 05 Dec 2023
User guide Texas Instruments' Magnetic Sense Simulator User's Guide PDF | HTML 04 Dec 2023
Application brief Current Sensing in Collaborative and Industrial Robotic Arms (Rev. B) PDF | HTML 24 Jul 2023
Application brief Low-Drift, Precision, In-Line Isolated Magnetic Motor Current Measurements (Rev. A) 24 Jul 2023
Application note TMCS110x Layout Challenges and Best Practices PDF | HTML 03 Dec 2022
White paper Improve High-Voltage System Efficiency With Zero-Drift Hall-Effect Current Sense (Rev. A) PDF | HTML 15 Mar 2022
EVM User's guide TMCS1108EVM User's Guide PDF | HTML 04 Dec 2020
Application note Thermal Implementation Guide for In-Package Magnetic Current Sensors PDF | HTML 12 Jul 2020
Application brief Precision Designs with Non-Ratiometric Magnetic Current Sensors 01 Jul 2019

Design & development

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Evaluation board

TMCS1108EVM — TMCS1108 isolated Hall-effect current sensing evaluation module

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 (...)

User guide: PDF | HTML
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Simulation model

TMCS1108 TINA-TI SPICE Model

SBOMBV2.ZIP (55 KB) - TINA-TI Spice Model
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Simulation model

TMCS1108A1B PSpice Model (Rev. A)

SBOMBO7A.ZIP (195 KB) - PSpice Model
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Simulation model

TMCS1108A1U PSpice Model (Rev. A)

SBOMBV6A.ZIP (194 KB) - PSpice Model
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Simulation model

TMCS1108A2B PSpice Model (Rev. A)

SBOMBV7A.ZIP (195 KB) - PSpice Model
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Simulation model

TMCS1108A2U PSpice Model (Rev. A)

SBOMBV5A.ZIP (194 KB) - PSpice Model
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Simulation model

TMCS1108A3B PSpice Model (Rev. A)

SBOMBO8A.ZIP (195 KB) - PSpice Model
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Simulation model

TMCS1108A3U PSpice Model (Rev. A)

SBOMBV4A.ZIP (194 KB) - PSpice Model
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Simulation model

TMCS1108A4B PSpice Model (Rev. A)

SBOMBO9A.ZIP (195 KB) - PSpice Model
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Simulation model

TMCS1108A4U PSpice Model (Rev. A)

SBOMBV3A.ZIP (193 KB) - PSpice Model
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Calculation tool

CS-MAGNETIC-ERROR-TOOL-CALC — Hall-Effect Current Sensor Comparison and Error Tool

Hall-Effect Current Sensor Comparison and Error Tool
Supported products & hardware

Supported products & hardware

Products
Hall-effect current sensors
TMCS1100 — ±600V basic isolation, 20Arms 80kHz Hall-effect current sensor with external reference TMCS1101-Q1 — AEC-Q100, ±600-V, precision, isolated current sensor with internal reference TMCS1100-Q1 — AEC-Q100, ±600-V, precision, isolated current sensor with external reference TMCS1101 — ±600V basic isolation, 20Arms 80kHz Hall-effect current sensor with reference TMCS1107 — ±420V basic isolation, 20Arms 80kHz Hall-effect current sensor with reference TMCS1107-Q1 — AEC-Q100, ±420-V isolated Hall-effect current sensor with internal reference TMCS1108 — ±100V basic isolation, 20Arms 80kHz Hall-effect current sensor with reference TMCS1108-Q1 — AEC-Q100, ±100-V isolated Hall-effect current sensor with internal reference TMCS1123 — ±1300V reinforced isolation, 80ARMS 250kHz Hall-effect current sensor with AFR, reference and ALERT TMCS1123-Q1 — AEC-Q100 80ARMS Hall-effect current sensor with AFR and ALERT TMCS1126 — 80ARMS 500kHz Hall-effect current sensor with AFR, reference and ALERT TMCS1126-Q1 — AEC-Q100 qualified 80ARMS 500kHz Hall-effect current sensor with AFR, reference and ALERT TMCS1127 — 80ARMS 250kHz Hall-effect current sensor with AFR TMCS1127-Q1 — AEC-Q100 80ARMS 250kHz Hall-effect current sensor with AFR TMCS1133 — 80ARMS 1MHz Hall-effect current sensor with AFR and ALERT TMCS1133-Q1 — Automotive 1MHz Hall-effect current sensor with AFR and ALERT TMCS1143 — ±849V reinforced isolation, 100ARMS 275kHz Hall-effect current sensor with AFR reference and ALERT TMCS1148 — 100ARMS 500kHz Hall-effect current sensor with AFR, reference and OCP
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