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ISL70100M

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Rad Tolerant 40V Current Sense Amplifier

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Overview

The ISL70100M is a radiation tolerant 40V current sense amplifier built on the Renesas proprietary PR40 Silicon-on-Insulator (SOI) process. The device has a wide power supply range of 2.7V to 40V. The input common-mode voltage is independent of the supply voltage and extends from -0.3V to 40.0V, making it ideal to use in both high-side and low-side applications.

The ISL70100M is a transconductance amplifier that monitors current using an external sense resistor and outputs a current proportional to the sensed voltage. The overall voltage gain is adjustable with a single resistor from the output to ground.

The amplifier has an extremely low offset voltage and input bias currents, making it ideal for precision sensing applications. It has a minimum bandwidth of 500kHz with a slew rate of 500µA/µs that makes it useful for current feedback in telemetry applications. When the part is powered down (V+ = V- = 0V), the sense pins (RS+, RS-) are high impedance to avoid loading the monitored circuit.

The part is available in a plastic 14Ld TSSOP package and operates across the temperature range of -55°C to +125°C.

ISL70100M Block Diagram
ISL70100M Block Diagram
  • Qualified to Renesas Rad Tolerant Screening and QCI Flow (R34TB0004EU)
  • Power supply range: 2.7V to 40V
  • Input common-mode range: -0.3V to 40V
  • Transconductance: 2µA/mV (typical)
    • ±1% accuracy (TA = 25°C)
    • ±1.5% accuracy (TA = -55°C, 125°C)
  • Voltage offset: 10µV (typical), V+ = 12V
  • Adjustable gain with a single resistor
  • Operating temperature range: -55°C to +125°C
  • Passes NASA low outgassing specifications
  • 14 Ld TSSOP with NiPdAu-Ag lead finish
  • TID Radiation Lot Acceptance Testing (RLAT) (LDR: ≤ 10mrad(Si)/s)
    • ISL70100M30VZ: 30krad(Si)
    • ISL70100M50VZ: 50krad(Si)
  • SEE Characterization
    • No DSEE with RS+ = 42V and V+ = 42V at 43MeV•cm2/mg
    • SET ≤ 2.31E-3cm2 at 43MeV•cm2/mg
    • SEFI < 10μm2 at 43MeV•cm2/mg

Documentation

Featured Documentation
Type Title Date
Datasheet
ISL70100M Datasheet
PDF 1.31 MB
Application Note
Key Circuits in Sensor Signal Conditioning Application Note
PDF 617 KB
White Paper
Wafer by Wafer Low Dose Rate Acceptance White Paper
PDF 533 KB
Application Note
AN9867: End of Life Derating: A Necessity or Overkill
PDF 338 KB
Application Note
AN9654: Use of Life Tested Parts
PDF 224 KB
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Resources

FAQs

  1. Can the Hi-Rel Current Sense Amplifiers be Used for Both High-Side and Low-Side Sensing Configurations?

    Yes. They can be used for both high or low-side sensing. There are two internal amplifiers and a common mode range detector. When the common mode voltage is below 1.7V the low-side amplifier is used to sense current and when the common mode voltage is above 1 ...

    Jul 11, 2025
  2. Can the Hi-Rel Current Sense Amplifiers Sense Current Across a Fuse?

    Yes. The absolute maximum differential voltage across the RS+ and RS- pins must be limited to 42V when the fuse is in an open state. Suitable Products ISL70100M, ISL70100SEH, ISL73100SEH

    Jul 11, 2025
  3. Can the Hi-Rel Current Sense Amplifiers Sense Current Bidirectionally?

    The current can only be sensed in the positive direction, i.e. current flowing from RS+ to RS- pins.

    Jul 11, 2025