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TPS7H2201-SP: eFUSE vs. Supervisory ICs

Part Number: TPS7H2201-SP
Other Parts Discussed in Thread: TL7700-SEP

I plan to install a rad hardened undervoltage protection circuit for our NOT rad hardened OBC subsystem. It's supply voltage is 3.3V. For this application, I am eyeing a radhard eFUSE (TPS7H2201-SP ) and a radhard supervisory IC (TL7700-SEP).

Both of them can cause an OBC reset during an undervoltage event. The eFUSE shuts itself down, thus shutting down / resetting the OBC. On the other hand, the supervisory IC sends a reset signal to the OBC to reset itself; hence, resetting itself.

However, I am still quite confused with the difference of the two given that they function the same way. Could your product engineer please tell me which one is better for my application? He might see something I don't.

I understand that the space-graded components are not abundant, thus I think I am willing to entertain military-graded components as well.

I am also done reading this TI paper: But I am still a bit confused.

  • Hi,

    Both of these space grade devices are available in quantity in the ti estore.  The ordering page on for each of the devices shows users that actual inventory quantities available and which typically ship immediately upon purchase.

    Regarding the device-specific questions, I will defer these to my colleagues who support these devices and are returning to the office tomorrow after the holiday today.



  • Hi,

    Both devices are capable of resetting the OBC, but the TPS7H2201-SP load switch has additional features that may be desirable depending on your design requirements.

    As you implied, the eFuse/Load Switch would go between the supply voltage rail and your subsystem, whereas the Voltage Supervisor would be adjacent to the subsystem. Because of this, the load switch is capable of providing current limiting and reverse current protection whereas the voltage supervisor cannot. This capability is very useful for shutting down and restarting circuitry that is susceptible to Single Event Latchup (SEL), which may be relevant for your application since your OBC subsystem is not rad hard. The TPS7H2201-SP load switch also has additional features such as reset timers, current sensing, separate OVP and UVLO/EN thresholds, soft start, and higher RHA rating (100krad TID) compared to the simpler TL7700-SEP supervisor. If you are planning on adding any of these features to your design, you may also be able to save space on your board by using the TPS7H2201-SP, which integrates them into a single IC, instead of using separate simpler devices. 

    I've added example application schematics from the datasheets of both devices below.

    Are there any specific questions you have on either device?