NJM431L2

Overview

The NJM431L2 is a three-terminal adjustable precision shunt regulator manufactured by Nisshinbo Micro Devices Inc. It utilizes bipolar technology to provide an output voltage range from approximately 2.5V to 36V, set via two external resistors. The device features a cathode current capability of 1mA to 100mA and operates within a temperature range of -40°C to +85°C. Key electrical characteristics include a reference voltage of 2.495V typical, low dynamic output impedance of 0.2Ω typical, and fast turn-on response.

Feature Summary

• Adjustable output voltage setting between VREF and 36V using two external resistors
• Fast turn-on response with sharp switching characteristics
• Low dynamic output impedance for stable regulation performance
• Operates with cathode currents ranging from 1mA to 100mA

Applications

• Shunt regulators
• Series regulators for small power supplies
• Isolation regulators with photocouplers
• Constant current sources

Procurement Notes

Verify the exact package type and suffix against official datasheets, as 'NJM431L' typically denotes TO-92 packaging while other suffixes indicate different form factors. Confirm RoHS compliance status and lead times directly with the manufacturer or authorized distributors before procurement. Ensure operating conditions remain within the specified absolute maximum ratings to prevent device failure.

Selection Notes

Select this component when a precise, adjustable voltage reference is required in a compact form factor. Consider the TO-92 package if through-hole mounting is necessary. Evaluate the thermal dissipation requirements based on the ambient temperature and load current to ensure operation remains within the safety operating boundary curve defined in the datasheet.

Part Context

The NJM431 series belongs to Nisshinbo's legacy adjustable shunt regulator family, offering high accuracy and stability. It serves as a versatile alternative to standard zener diodes, providing superior regulation and lower dynamic impedance. The series supports various packages including DIP, DMP, TO-92, and SOT-89 to accommodate diverse PCB layout constraints.

Replacement Considerations

Compatible alternatives include the TL431 series from Texas Instruments and similar adjustable shunt regulators from other manufacturers. Verify pinout compatibility and electrical specifications such as reference voltage tolerance and maximum cathode current before substitution.