S-1111B39MC-NYYTFG

Overview

The S-1111B39MC-NYYTFG is a positive voltage regulator from the S-1111/1121 Series developed by Seiko Instruments Inc. It provides a fixed output voltage of 3.9 V with an accuracy of ±1.0%. The device operates within an input voltage range of 2.0 V to 6.5 V and supports an output current of up to 150 mA. Typical dropout voltage is 0.20 V at 100 mA, and ripple rejection is 70 dB at 1.0 kHz. Current consumption is 35 μA during operation and 0.1 μA in power-off mode. It features built-in overcurrent protection and an ON/OFF circuit, housed in an SOT-23-5 package.

Feature Summary

• Built-in low on-resistance P-channel MOS FET output transistor enables low dropout voltage and large output current capability.
• Integrated ON/OFF circuit allows for significant reduction in current consumption when the regulator is stopped, extending battery life.
• Built-in overcurrent protection circuit limits output current to prevent damage if the load exceeds the capacity of the output transistor.

Applications

• Power supply for battery-powered devices
• Power supply for personal communication devices
• Power supply for home electric/electronic appliances
• Power supply for cellular phones

Procurement Notes

Verify the specific ordering suffix against the manufacturer's product name structure documentation to confirm pin configuration and environmental codes. Confirm that the component meets RoHS and halogen-free requirements as specified in the datasheet. Ensure compatibility with the SOT-23-5 package footprint and tape reel specifications for surface mount assembly processes.

Selection Notes

Select this component for applications requiring a fixed 3.9 V output with high accuracy. Ensure the input voltage remains at least 1.0 V above the output voltage for optimal performance. Verify that the external output capacitor has an ESR within the recommended range to prevent oscillation. Consider the thermal dissipation capabilities of the SOT-23-5 package under maximum load conditions.

Part Context

This part belongs to the S-1111/1121 Series of CMOS voltage regulators manufactured by Seiko Instruments Inc. The series is characterized by high ripple rejection and low dropout voltage. The S-1111 variant specifically utilizes a pin configuration where Pin 1 is VIN and Pin 3 is the ON/OFF control pin, distinguishing it from the S-1121 series which swaps these positions.

Replacement Considerations

S-1111B39MC-NYATFx (Negative logic ON/OFF pin)

FAQ

What is the function of the NC pin on the S-1111B39MC-NYYTFG?

Pin 4 is designated as NC (No Connection) and is electrically open. It can be connected to the VIN pin or the VSS pin if necessary for mounting purposes.

How does the ON/OFF pin control the regulator operation?

For the 'B' type product like this model, setting the ON/OFF pin to a High level turns the regulator ON, while setting it to a Low level turns it OFF, stopping internal circuits and reducing current consumption.