Automotive ICs

Automotive, 125°C Operation, 6 V, Window Voltage Detector with Fast Detection Response and Manual Reset Function S-191AxxxxA Series

Contributes to Building Greater Functional Safety of Automotive Devices! Window voltage detector S-191A/1B/122 Series

This IC, developed using CMOS technology, is a high-accuracy window voltage detector that detects undervoltage and overvoltage. The detection voltage and release voltage are fixed internally with an accuracy of ±1.5%.
Apart from the power supply pin, the detection voltage input pin (SENSE pin) is also prepared, so the output is stable even if the SENSE pin voltage (VSENSE) falls to 0 V.
The release signal can be delayed by setting a capacitor externally, and the release delay time accuracy is ±15% (CD = 3.3 nF). This IC also has a manual reset function. The manual reset function changes the comparator input voltage of the internal circuit, and the detector is forcibly put into the detection status. This enables a diagnosis of anomalies in the detector, such as erroneous release.
The output form is Nch open-drain output.

FIT rate calculation
ABLIC Inc. offers FIT rate calculated based on actual customer usage conditions in order to support customer functional safety design.
For more information regarding our FIT rate calculation, contact our sales representatives.

Caution: This product can be used in vehicle equipment and in-vehicle equipment. Before using the product for these purposes, it is imperative to contact our sales representatives.


Detection voltage
Undervoltage detection voltage 0.6 V to 4.9 V (0.05 V step)
Overvoltage detection voltage 0.7 V to 5.5 V (0.05 V step)
Detection voltage accuracy
Undervoltage detection voltage ±1.5%
Overvoltage detection voltage ±1.5%
Hysteresis width selectable from "Available" / "Unavailable"
"Available": 3.0%, 5.0%, 10.0%
"Unavailable": 0%
Detection response time
10.0 μs typ.
Manual reset function
MR pin input logic: Active "L"
Release delay time accuracy
±15% (CD = 3.3 nF)
Output form
Nch open-drain output
Current consumption
1.5 μA typ.
Operation voltage range
2.5 V to 6.0 V
Operation temperature range
Ta = −40°C to +125°C
Lead-free (Sn 100%), halogen-free
AEC-Q100 qualified*1

*1. Contact our sales representatives for details.


  • Overvoltage detection of power supply for automotive electric component
  • Voltage monitoring of automotive ECUs, ADAS and other systems that require failure detection
  • For automotive use (engine, transmission, suspension, ABS, related-devices for EV / HEV / PHEV, etc.)

Parts List

  • U(Ux), S and G at the end of the product name of ABLIC Inc. were used to indicate different material specifications as “environmental code”,
    however, these have now been unified into “lead-free and halogen-free” and are identical in terms of environmental quality.
  • Note: Lead-free plating other than 100% Sn is applied to some limited old products, therefore, please contact our sales representatives for details.
  • These descriptions may be different from the actual product name and parameter.
    Please confirm the product name and specifications with the data sheet again.
  • The information herein is subject to change without notice.