1. Product profile
1.1. General description
LED driver consisting of resistor-equipped NPN transistor with two diodes on one chip in a medium
power SOT223 (SC73) plastic package.

1.2. Features and benefits
• Stabilized output current of 10 mA without external resistor
• Stabilized output current adjustable up to 150 mA when an external resistor is used
• High current accuracy at supply voltage variation
• Low voltage overhead of 1.4 V
• Reduces component count and board space
• High power dissipation of 1250 mW
• Supply voltage up to 40 V
• Digital PWM input up to 10 kHz frequency for NCR421Z
• AEC-Q101 qualified

1.3. Applications
• Constant current LED driver
• Generic constant current source
• Automotive applications (for example: interior lighting, dash board, instrumentation,
number plate light)
• Increase stabilized output current by paralleling drivers