NCP187AMT330TAG

NCP187AMT330TAG is an ON Semiconductor NCP187 family fixed-output switching regulator device. The “330” indicates a 3.3 V output, and “MT” denotes its MT-series surface-mount package. It is used to efficiently convert a higher input voltage down to a stable 3.3 V rail in a compact footprint.
Key points:
- Type: fixed-output switching regulator (buck) in MT package (8-pin typical).
- Output: 3.3 V (fixed) for supply rails in digital and mixed-signal circuits.
- Features: built-in regulation reference, protection features (e.g., undervoltage, overcurrent/short-circuit, thermal shutdown), and usually soft-start and current-mode control.
- External components: external inductor, input/output capacitors, and either a catch diode (if not fully synchronous) plus feedback network and an enable/adjustment pin per datasheet.
- Applications: automotive, industrial, consumer electronics requiring a 3.3 V rail from higher voltages.
For exact pinout, electrical characteristics, typical application circuit, and layout guidelines, refer to the official NCP187AMT330TAG datasheet on ON Semiconductor’s website.

Here are the typical features of NCP187AMT330TAG (ON Semiconductor NCP187 family):
- Off-line flyback controller with external MOSFET drive
- 650 V high-voltage startup current source for simple primary-side startup
- Current-mode PWM with valley switching support for low switching losses
- Fixed-frequency operation (frequency set by external components)
- Cycle-by-cycle overcurrent/short-circuit protection
- Overvoltage protection and undervoltage lockout
- Thermal shutdown protection
- Soft-start to limit inrush and peak currents
- Primary-side regulation (PSR) capable (with optional opto-isolation)
- Low standby power and suitable for offline adapters and auxiliary supplies
Note: Exact parameters (Voltage ratings, frequency range, gate-drive specs) vary by variant; consult the datasheet for precise numbers.

NCP187AMT330TAG is in an 8‑pin SOIC (SOP‑8) package, supplied in tape‑and‑reel (TAG) packaging.

- Pin count: 8 pins (8-pin package, e.g., MSOP/SO-8)
- Function: Fixed 3.3V buck DC-DC converter (step-down regulator) with an integrated high-side switch; requires external inductor, catch diode/output capacitors, and input/output caps. Provides EN/FB pins for regulation.

Manufacturer: ON Semiconductor (ON Semiconductor Corporation).
What kind of company: A global American semiconductor company that designs and manufactures energy-efficient ICs and discrete components for automotive, industrial, communications, and consumer markets.

NCP187AMT330TAG is used as an offline switch‑mode power controller (flyback) for isolated SMPS. Typical applications include:
- Isolated AC-DC adapters and wall-wart/brick power supplies (USB chargers)
- Constant-current LED driver applications
- Battery chargers and other low-to-moderate power consumer electronics power supplies