Automotive ICs

Automotive, 105°c Operation, 5.5 V Input, 150 mA Voltage Regulator S-19251 Series

The S-19251 Series, developed by using CMOS process technology, is a positive voltage regulator with a low current consumption, high ripple-rejection and high-accuracy output voltage.
This IC has high ripple-rejection of 75 dB typ., and operates with low current consumption of 20 μA typ.
Also, a built-in overcurrent protection circuit to limit overcurrent of the output transistor and a built-in thermal shutdown circuit to limit heat are included. In addition to the conventional package SOT-23-5, the super-small packages HSNT-4(1010)B and HSNT-4(0808)B are added to the lineup, which realizes higher-density mounting.

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.


Output voltage
1.0 V to 3.5 V, selectable in 0.05 V step
Input voltage
1.5 V to 5.5 V
Output voltage accuracy
±2.5% (Tj = −40°C to +105°C)
Current consumption
During operation: 20 μA typ., 50 μA max. (Tj = −40°C to +105°C)
During power-off: 0.1 μA typ., 4.5 μA max. (Tj = −40°C to +105°C)
Dropout voltage
0.16 V typ. (2.8 V output product, IOUT = 100 mA)
Output current
Possible to output 150 mA (VIN ≥ VOUT(S) + 1.0 V)*1
Ripple rejection
75 dB typ. (1.2 V output product, f = 1.0 kHz)
70 dB typ. (2.8 V output product, f = 1.0 kHz)
Input capacitor
A ceramic capacitor can be used. (1.0 μF or more)
Output capacitor
A ceramic capacitor can be used. (1.0 μF or more)
Built-in overcurrent protection circuit
Limits overcurrent of output transistor.
Built-in thermal shutdown circuit
Detection temperature 150°C typ.
Built-in ON / OFF circuit
Ensures long battery life.
Discharge shunt function “available” / “unavailable” is selectable.
Pull-down function “available” / “unavailable” is selectable.
Operation temperature range
Ta = −40°C to +105°C
Lead-free (Sn 100%), halogen-free
AEC-Q100 qualified*2

*1. Please make sure that the loss of the IC will not exceed the power dissipation when the output current is large.
*2. Contact our sales representatives for details.


  • For automotive use (meter, car body, headlight, ITS, accessory, car navigation system, car audio system, etc.)
    : SOT-23-5 package product
  • For automotive use (accessory, car navigation system, car audio system, etc.)
    : HSNT-4(1010)B package product, HSNT-4(0808)B package product