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ISL70591SEH

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Radiation Hardened 100µA and 1mA Precision Current Source

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Overview

The ISL70591SEH is a radiation hardened precision 100µA and 1mA current source IC. The device has excellent accuracy of ±1% over a wide operating voltage range of 3V to 40V and over a temperature range of -55 °C to +125 °C. Fabricated with the Renesas proprietary PR40 Silicon On Insulator (SOI) process, the device is immune to single event latch-up. The high output impedance of the device makes it insensitive to voltage drops across long lines. It can withstand a forward operating voltage of 40V and a reverse voltage of -0.5V. The ISL7x591SEH and ISL7x592SEH are two-terminal floating current sources allowing them to be used in high-side, low-side, and dual-side load applications such as sensor excitation, biasing networks, low voltage references, floating voltage references, and ramp generators. The current sources were primarily designed for thermistor and other sensor excitation applications widely used in space crafts. The ISL7x591SEH and ISL7x592SEH are available in a 4 Ld ceramic flatpack and die forms. The temperature range is -55 °C to +125 °C.

  • Electrically screened to DLA SMD 5962-18217
  • Wide operating voltage range: 3V to 40V
  • High initial accuracy (+V = 20V at +25 °C): ISL7x591SEH: ±0.34%, ISL7x592SEH: ±0.30%
  • High output impedance: ISL7x591SEH: 189MΩ (typical), ISL7x592SEH: 14MΩ (typical)
  • Completely floating: No ground connection
  • Radiation acceptance testing - ISL70591SEH and ISL70592SEH
    • High dose rate (50-300rad(Si)/s): 100krad(Si)
    • Low dose rate (0.01rad(Si)/s): 75krad(Si)
  • Radiation acceptance testing - ISL73591SEH and ISL73592SEH: Low dose rate (0.01rad(Si)/s): 75krad(Si)
  • SEE hardness
    • No SEB/SEL LETTH, +V = 35V: 86MeV•cm2/mg
    • SET duration (time recovery) ≤ 125µs

Documentation

Featured Documentation
Type Title Date
Datasheet
ISL70591SEH, ISL70592SEH, ISL73591SEH, ISL73592SEH Datasheet
PDF 780 KB
Report
ISL70591SEH & ISL73591SEH Neutron Test Report
PDF 230 KB
Other
Standard Microcircuit Drawing 5962-18217 (ISL70591SEH, ISL73591SEH, ISL70592SEH, ISL73592SEH)
Report
ISL70591SEH & ISL73591SEH Total Dose Test Report
PDF 347 KB
Report
ISL7x591SEH, ISL7x592SEH SEE Test Report
PDF 716 KB
Manual - Development Tools
ISL70591SEHEVAL1Z User Guide
PDF 555 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
8 items

Design & Development

Software Downloads
Type Title Date
PCB Design Files
ISL70591SEHEVAL1Z Design Files
ZIP 229 KB
1 item
isl70591seheval1z-eval-board.jpg
Evaluation
ISL70591SEHEVAL1Z Active

Radiation Hardened 100µA and 1mA Precision Constant Current Sources Evaluation Board

The ISL70591SEHEVAL1Z evaluation board provides a quick and easy method for evaluating the ISL70591SEH radiation hardened 100µA precision constant current source designed for thermistor and other resistive sensor excitation applications. Its two-terminal floating type topology allows the load to...

Recommended Documents:
ISL70591SEHEVAL1Z User Guide
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ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.

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Diagram of ECAD Models

Models
Type Title Date
Model - SPICE
ISL70591SEH and ISL73591SEH Spice Model
ZIP 30 KB
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FAQs

  1. DNC Pins on ISL7x591SEH or ISL7x592SEH Current Sources

    Question: For these current sources, can the DNC pins (pin 2 and pin 3) be connected externally to V+ or ground?   Answer: No, the DNC pins for the ISL70591SEH, ISL70592SEH, ISL73591SEH, and ISL73592SEH should not be externally connected to V+ or ground. They need to be left floating. Connecting them ...

    Jan 1, 1970
  2. What is the compliance voltage range of the ISL7x591SEH and ISL7x592SEH current sources?

    Question: What is the compliance voltage range of the ISL70591SEH, ISL70592SEH, ISL73591SEH and ISL73592SEH current sources?   Answer: The parts have a wide compliance voltage range of 3V to 40V in terrestrial applications and 3V to 35V in space applications. A minimum of 3V must be maintained across the current source ...

    Jan 1, 1970
  3. Why did Renesas provide output current limits at various supply voltages for the ISL7x591SEH and ISL7x592SEH current sources?

    Question: The ISL70591SEH, ISL70592SEH, ISL73591SEH, ISL73592SEH data sheet has specifications for output current at various supply voltages. Why did Renesas provide output current limits at various supply voltages?   Answer: The output current accuracy varies at different V+ voltages and temperature level. Limits are provided at V+ voltages of 3V, 12V ...

    Jan 1, 1970
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