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NCP1251CSN65T1G The NCP1251CSN65T1G is a current-mode PWM controller from On Semiconductor designed for offline power supplies. It operates within an 8.8V to 28V VCC range at 65kHz.
Mfr Part #:

NCP1251CSN65T1G

Available from 2 distributors
Mfr Name: On Semiconductor
On Semiconductor
The NCP1251CSN65T1G is a current-mode PWM controller from On Semiconductor designed for offline power supplies. It operates within an 8.8V to 28V VCC range at 65kHz.
✓ Total Stock: 52,000 pcs
$ Price Range: $0.75

NCP1251CSN65T1G Available from 2 distributors

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✓ Non-Authorised
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Flip Electronics ✓
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51,000 pcs
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51000 pcs On Request 1 On Request On Request On Request On Request On Request
Xingangxin ✓
Non-Authorised Inventory information
1,000 pcs
On Request
1000 pcs On Request 1 On Request On Request On Request On Request On Request
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NCP1251CSN65T1G Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Duty Cycle
Fault Protection
Frequency
Internal Switch(s)
Lead Style
Mounting Type
Operating Temperature
Output Isolation
Supplier Device Package
Topology
Voltage
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NCP1251CSN65T1G Description

Short technical summary and product information.

The NCP1251CSN65T1G is a highly integrated PWM controller from On Semiconductor, suitable for rugged and high-performance offline power supplies. It operates in peak current mode control with a fixed frequency of 65 kHz, and can also operate at 100 kHz. The device supports a supply voltage range up to 28 V.

 

Key features include internal and adjustable Over Power Protection (OPP), frequency foldback down to 26 kHz in light load conditions, and skip-cycle operation. It also incorporates a fixed 4 ms soft-start and 100 ms timer-based auto-recovery short-circuit protection. Over Voltage Protection (OVP) is available on the VCC line and an external input pin for enhanced robustness.

 

This controller is housed in a compact 6-TSOP (SOT-23-6 Thin) package, designed for surface mount applications. Its fault protection includes Over Power, Over Voltage, and Short Circuit.

 

Typical applications include AC-DC converters for TVs, set-top boxes, printers, and offline adapters for notebooks and netbooks.

NCP1251CSN65T1G Quick Information

Product Type: AC DC Converter
Series: NCP1251
Canonical Name: NCP1251 Current-Mode PWM Controller
Subcategory: Offline Switches

NCP1251CSN65T1G Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

NCP1251CSN65T1G Estimated Pricing

Qty Low High
1+ $0.75 $0.75

Estimated market price range - modelled values for guidance only, not live distributor offers.

NCP1251CSN65T1G Features

  • Current-mode PWM controller for offline supplies.
  • Operates from 8.8V to 28V VCC.
  • Fixed 65kHz or 100kHz switching frequency.
  • Includes Over Power and Over Voltage protection.
  • Compact 6-TSOP surface mount package.

NCP1251CSN65T1G Applications

  • Used in AC-DC converters for TVs.
  • Suitable for set-top box power supplies.
  • Applied in printer power adapters.
  • Designed for notebook adapter circuits.

NCP1251CSN65T1G FAQs

7 frequently asked questions generated from this part’s specifications.
What is the operating voltage range?

8.8V to 28V.

What is the operating temperature range?

-40°C to 125°C (junction temperature).

What package is available?

6-TSOP (SOT-23-6 Thin, TSOT-23-6).

What is the switching frequency?

Fixed at 65kHz or 100kHz, with frequency foldback to 26kHz under light load.

What fault protections are included?

Over power, over voltage, and short circuit protection.

What topology does this controller use?

Flyback topology with isolated output.

What is the soft-start time?

Internal fixed 4ms soft-start.

NCP1251CSN65T1G Alternate Parts

Same form/fit/function or matching attribute configuration across different manufacturers.
View All Alternate Parts
NCP1250ASN65T1G
NCP1250ASN65T1G
On Semiconductor
The ON Semiconductor NCP1250ASN65T1G is an offline switcher IC featuring a flyback topology and a 65kHz switching frequency. It operates within an 8.8V to 28V voltage range and is available in a surface mount package.
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