NCP187AMT330TAG

NCP187AMT330TAG is an ON Semiconductor part in the NCP187 family, a primary‑side switch‑mode power supply controller used for offline SMPS and LED drivers.
What it is
- A PWM controller (typically used with an external MOSFET) for flyback/other offline power supplies.
- Automotive/industrial variant in an 8‑pin package (AMT) with tape & reel packaging (TAG).
Key features (typical of the NCP187 family)
- High‑voltage startup and operation (high-voltage domain to directly rectify/charge Vcc)
- Current‑mode control for stable regulation and simple compensation
- Fixed switching frequency with protection modes
- Protections: UVLO/OVP, overcurrent/short‑circuit protection, thermal shutdown
- Soft‑start and enable/shutdown control
- Suitable for off-line adapters, standby power, and LED driver applications
How to use
- Connect to an external MOSFET, sense resistor, and feedback network per datasheet
- Design around flyback topology for regulation and isolation
For precise specs and pinout, refer to the official datasheet for NCP187AMT330TAG.

Here are the key features of NCP187AMT330TAG (typical for NCP187 family in an compact HV MOSFET primary‑side controller):
- Integrated high‑voltage startup current source and switching MOSFET for offline flyback operation
- Primary‑side regulation (no optocoupler) with quasi‑resonant/valley switching for high efficiency and low EMI
- Universal input: covers 85–265 VAC (broad mains range)
- Cycle‑by‑cycle current limit with protection against short circuits
- Overvoltage protection and brown‑in/brown‑out detection
- Thermal shutoff for overtemperature protection
- Soft‑start to limit inrush and startup stress
- Enable/shutdown control pin for simple on/off
- Low standby power consumption
- Suitable for compact power adapters/chargers in an SMT package (AMT variant)
Note: exact electrical tolerances and timing specs vary by revision; consult the datasheet for the precise numbers for your lot.

- Pin count: 5 pins (SOT-23-5 / SC-70-5 package)
- Function: 3.3V fixed-threshold voltage supervisor (Reset IC). It monitors VCC and asserts an active-low reset output to a microcontroller when the supply is below ~3.3V or during power-up, ensuring proper MCU reset.

- Manufacturer: ON Semiconductor (ON Semiconductor Corp.)
- What kind of company: An American multinational semiconductor company that designs and manufactures energy-efficient ICs, discretes, sensors, and power‑management components for automotive, industrial, computing, and consumer markets.

NCP187AMT330TAG is a high-voltage PWM/PFC controller for offline SMPS. Typical applications include:
- Universal-input offline switch-mode power supplies with PFC (AC adapters, wall-wart/USB chargers)
- Power supplies for TVs, monitors, set-top boxes, audio/video equipment
- Industrial and telecom power supplies needing compact, high-efficiency designs
- Standby/auxiliary power supplies in appliances to meet energy-efficiency standards
These cover consumer electronics, industrial/communication equipment, and efficiency-focused power designs.

SOT-23-5 (SC-70-5) package.