PN8161 Overview
The Chipown PN8161 is a highly integrated quasi-resonant AC/DC switching regulator that combines a quasi-resonant current-mode controller with a built-in 690V high-avalanche-capability power MOSFET in a single SOP-8 package. Designed for high-performance offline power conversion, the PN8161 minimises external component count by eliminating the need for start-up resistors and current-sense (CS) resistors, reducing BOM cost and PCB footprint significantly.
Chipown’s PN8161 employs a proprietary hybrid modulation scheme that seamlessly transitions between QR-PWM, QR-PFM, and Burst-mode operation depending on load conditions. This approach, combined with a low-power device architecture, enables standby power consumption below 50mW at 230VAC, making the PN8161 well-suited for designs targeting stringent energy efficiency regulations such as EU CoC Tier 2 and DoE Level VI. Integrated Soft Driver technology and spread-spectrum frequency modulation further suppress EMI, reducing filtering requirements.
The PN8161 incorporates a comprehensive protection suite — including output overvoltage protection, cycle-by-cycle overcurrent protection, output open/short-circuit protection, secondary rectifier short-circuit protection, overload protection, soft-start, over-temperature protection, and input undervoltage lockout — ensuring robust, reliable operation in end products. Its wide supply voltage range of 9V to 38V makes it suitable for a broad range of output voltage configurations across charger, adapter, and open-frame power supply designs.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | PN8161 |
| Manufacturer | Chipown |
| Package | SOP-8 |
| Topology | Quasi-Resonant (QR) Flyback |
| Supply Voltage (VCC) | 9V to 38V |
| Breakdown Voltage | 690V |
| Maximum Switching Frequency | 125kHz |
| Modulation Modes | QR-PWM / QR-PFM / Burst-mode |
| Standby Power Consumption | <50mW @ 230VAC |
| Operating Temperature Range | −40°C to +150°C |
| Protection Features | OVP, OCP, OLP, OTP, SCP, UVLO, Soft-start |
| High-Voltage Start-up | Built-in (no external start-up resistor required) |
Applications
The Chipown PN8161 is primarily targeted at consumer and industrial offline power conversion designs. Typical applications include mobile phone chargers, laptop and tablet adapters, set-top box power supplies, smart home device power modules, LED lighting drivers, open-frame industrial switching power supplies, and auxiliary power supplies within larger systems such as inverters and industrial control equipment.
Pin-to-Pin Compatible Alternatives
Replacing incumbent Western brand AC/DC controller ICs with the Chipown PN8161 allows design teams to reduce component cost and improve supply chain resilience without requiring PCB re-layout or firmware changes.
| Reference Part Number | Original Manufacturer | Why Choose PN8161 |
|---|---|---|
| TNY290 | Power Integrations | Lower unit cost with equivalent quasi-resonant performance and built-in MOSFET |
| NCP1380 | onsemi | Same SOP-8 footprint; integrated high-voltage start-up eliminates external resistors |
| STR-A6069H | Sanken | Drop-in form factor; Burst-mode standby delivers comparable <50mW no-load consumption |
| ICE2QR0665G | Infineon | Cost-optimised alternative with equivalent 650V+ MOSFET class and QR topology |
| FAN6300H | onsemi (Fairchild) | Pin-compatible QR flyback controller replacement with enhanced EMI spread-spectrum feature |
Frequently Asked Questions
Is PN8161 RoHS compliant?
Yes. The Chipown PN8161 is manufactured in compliance with the RoHS Directive (2011/65/EU) and its amendment (EU) 2015/863, restricting hazardous substances including lead, mercury, cadmium, and hexavalent chromium. Compliance documentation is available upon request through ABL Semi.
What are the pin-to-pin replacements for PN8161?
The PN8161 is positioned as a cost-effective, pin-compatible alternative to several established quasi-resonant flyback controller ICs, including the Power Integrations TNY290, onsemi NCP1380, Sanken STR-A6069H, and Infineon ICE2QR0665G. See the compatibility table above for specific substitution guidance.
What is the minimum order quantity (MOQ) for PN8161?
ABL Semi offers flexible MOQ for the PN8161, supporting both prototype quantities and mass production orders. Contact us for current stock levels and pricing.
What package options are available for PN8161?
The PN8161 is available in an SOP-8 (Small Outline Package, 8-lead) configuration. This industry-standard package is compatible with automated SMT assembly and widely supported by PCB layout tools. If your design requires an alternative package variant, contact ABL Semi to discuss availability.
What switching topology does the PN8161 use, and why does it matter for efficiency?
The PN8161 uses a quasi-resonant (QR) flyback topology, which switches the internal MOSFET at the valley point of the drain voltage waveform. This valley-switching technique reduces switching losses compared to hard-switched PWM designs, enabling higher efficiency across the load range — particularly at light and medium loads — while also lowering EMI. The automatic transition between QR-PWM, QR-PFM, and Burst-mode further optimises efficiency from full load down to standby, making the PN8161 suitable for energy-efficiency-regulated markets.
For complete product specifications, please refer to: