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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) - AC DC Converters, Offline Switchers > VIPER28HN
STMicroelectronics
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VIPER28HN

In Stock 5132 pcs Reference Price(In US Dollars)
1+
$2.4466
Manufacturer Part Number:
VIPER28HN
Manufacturer / Brand
STMicroelectronics
Part of Description:
IC OFFLINE SWITCH FLYBACK 7DIP
Datasheets:
VIPER28HN(1).pdfVIPER28HN(2).pdfVIPER28HN(3).pdfVIPER28HN(4).pdf
Lead Free Status / RoHS Status:
ROHS3 Compliant
Stock Condition:
New original, 5132 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number VIPER28HN
Manufacturer / Brand STMicroelectronics
Stock Quantity 5132 pcs Stock
Category Integrated Circuits (ICs) > Power Management (PMIC) - AC DC Converters, Offline Switchers
Description IC OFFLINE SWITCH FLYBACK 7DIP
Lead Free Status / RoHS Status: ROHS3 Compliant
RFQ VIPER28HN Datasheets VIPER28HN Details PDF
VIPER28HN Details PDF for KR.pdf
VIPER28HN Details PDF for IT.pdf
VIPER28HN Details PDF for ES.pdf
VIPER28HN Details PDF for DE.pdf
VIPER28HN Details PDF for FR.pdf
Voltage - Supply (Vcc/Vdd) 8.5V ~ 23.5V
Voltage - Start Up 14 V
Voltage - Breakdown 800V
Topology Flyback
Supplier Device Package 7-DIP
Series VIPer™ plus
Power (Watts) 16 W
Package / Case 8-DIP (0.300', 7.62mm), 7 Leads
Package Tube
Output Isolation Isolated
Operating Temperature -40°C ~ 150°C (TJ)
Mounting Type Through Hole
Internal Switch(s) Yes
Frequency - Switching 115kHz
Fault Protection Current Limiting, Over Temperature, Over Voltage, Short Circuit
Duty Cycle 80%
Control Features -
Base Product Number VIPER28

Packaging & ESD

Industry-standard static shielding packaging is used for electronic components.Anti-static, light-transparent materials allow easy identification of ICs and PCB assemblies.
The packaging structure provides electrostatic protection based on Faraday cage principles.This helps protect sensitive components from static discharge during handling and transportation.


All products are packed in ESD-safe anti-static packaging. Outer packaging labels include part number, brand, and quantity for clear identification. Goods are inspected prior to shipment to ensure proper condition and authenticity.

ESD protection is maintained throughout packing, handling, and global transportation. Secure packaging provides reliable sealing and resistance during transit. Additional cushioning materials are applied when required to protect sensitive components.

QC(Part Testing by IC Components)Quality Warranty

We can offer worldwide express delivery service, such as DHLor FedEx or TNT or UPS or other forwarder for shipment.

Global Shipment by DHL/FedEx/TNT/UPS

Shipping Fees reference DHL/FedEx
1). You can offer your express delivery account for shipment, ifyou haven’t any express account for shipment, we can offer our account inadvance.
2). Use our account for shipment, Shipment charges(Reference DHL/FedEx, Different Countries has different price.)
Shipment charges： (Reference DHL and FedEX)
Weight(KG): 0.00kg-1.00kg Price(USD$) : USD$60.00
Weight(KG): 1.00kg-2.00kg Price(USD$) : USD$80.00
* The price of cost is reference with DHL/FedEx. The detail charges, please contact us. Different country the express charges are different.



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VIPER28HN Product Details:

The VIPER28HN by STMicroelectronics is a high-performance Power Management Integrated Circuit (PMIC) designed for offline AC-DC conversion applications, specifically utilizing the Flyback topology. This robust integrated circuit is part of the VIPer Plus series, offering advanced power conversion capabilities for a wide range of electronic design challenges.

Engineered for versatility, the VIPER28HN addresses critical power conversion requirements with exceptional reliability and efficiency. Its innovative design enables offline power conversion with a switching frequency of 115kHz, making it ideal for applications demanding precise and stable power management. The device can operate across an extended temperature range of -40°C to 150°C, ensuring consistent performance in demanding environmental conditions.

Key features include comprehensive fault protection mechanisms, incorporating current limiting, over-temperature, over-voltage, and short-circuit safeguards. The integrated circuit supports a supply voltage range of 8.5V to 23.5V, with a startup voltage of 14V and an impressive 80% duty cycle. It can deliver up to 16W of power while maintaining electrical isolation, which is crucial for safety-critical applications.

The through-hole DIP7 package ensures straightforward mounting and compatibility with traditional circuit board designs. Its lead-free and RoHS-compliant construction meets contemporary environmental standards, making it suitable for modern electronic manufacturing processes.

Potential equivalent or alternative models in the same series include:

1. VIPER26HN

2. VIPER27HN

3. VIPER29HN

This integrated circuit is particularly well-suited for applications such as:

- Power supplies

- Consumer electronics

- Lighting control systems

- Industrial control equipment

- Telecommunications infrastructure

- Automotive electronics

The VIPER28HN's combination of high voltage breakdown (800V), integrated internal switches, and multi-layered protection mechanisms make it a versatile and reliable solution for complex power conversion challenges across diverse technological domains.

VIPER28HN Key Technical Attributes

Manufacturer Part Number - VIPER28HN

Manufacturer - STMicroelectronics

Series - VIPer plus

VIPER28HN Packing Size

Package Type - Tube

Material - DIP7 packaging

Dimensions - 8-DIP (0.300", 7.62mm), 7 Leads

Thermal Properties - Operating Temperature -40°C ~ 150°C (TJ)

Electrical Properties - Voltage - Supply (Vcc/Vdd): 8.5 V ~ 23.5 V

VIPER28HN Application

Designed for use in AC DC Converters and Offline Switching applications suitable for various electronic devices and power systems.

VIPER28HN Features

The VIPER28HN is a powerful integrated converter featuring a flyback topology and a high frequency of 115kHz. It supports an operating voltage range from 8.5 V to 23.5 V and breakdown voltage up to 800V. The device integrates internal switches and offers a maximum output power of 16W. It comes with fault protection mechanisms for current limiting, over temperature, over voltage, and short circuit scenarios. The start-up voltage is specified at 14V and a maximum duty cycle of 80% enhances its operational efficiency.

VIPER28HN Quality and Safety Features

This IC is RoHS compliant, demonstrating adherence to stringent environmental standards. It obtains a Moisture Sensitivity Level (MSL) of 1 (Unlimited), ensuring reliability and longevity under various environmental conditions. Its isolated output and robust encapsulation contribute significantly to its safety features.

VIPER28HN Compatibility

This product is suitable for high-demand applications requiring isolated power supply solutions and efficient power conversion with compact DIP7 packaging that facilitates easy mounting (Through Hole).

VIPER28HN Datasheet PDF

For detailed specifications and complete technical details, customers are encouraged to download the most authoritative datasheet of VIPER28HN available on our website.

Quality Distributor

IC-Components is a premium distributor of STMicroelectronics products, including the VIPER28HN. We guarantee genuine components at competitive prices. Get a custom quote today on our website and experience our excellent customer service and logistical support.

Ensure your projects meet high standards by sourcing your IC needs through IC-Components, where quality and reliability are at the heart of our offerings.

Frequently Asked Questions

When designing a compact, power-limited adapter using the VIPER28HN, what are the practical considerations for selecting external components like the transformer and output capacitor to ensure stable operation within its 16W power rating and 115kHz switching frequency?
For the VIPER28HN, selecting an appropriately sized transformer with sufficient core material and winding capability is crucial to avoid saturation at peak currents, especially when operating close to the 16W limit. The transformer's turns ratio will dictate output voltage, and its leakage inductance can impact switching transients, potentially requiring snubbers. Output capacitor selection should focus on low Equivalent Series Resistance (ESR) and sufficient capacitance to smooth ripple at 115kHz, considering the duty cycle. Transient voltage suppression (TVS) diodes on the output might be necessary to protect downstream components from voltage spikes.
I'm migrating a design from an older offline switcher to the STMicroelectronics VIPER28HN. What are the key design implications and potential pitfalls to consider regarding its 8.5V to 23.5V VCC operating range and 14V start-up voltage, especially if my existing power supply is less stable?
The VIPER28HN's VCC operating range of 8.5V to 23.5V and a 14V start-up voltage imply a need for a robust auxiliary winding or a pre-charge circuit to reliably power the internal control logic. If your existing power supply is less stable or has lower start-up voltage, you may need to redesign the auxiliary winding's transformer ratio or introduce a dedicated start-up circuit to ensure the VIPER28HN reliably powers up and stays within its operating window. Failure to do so can lead to intermittent operation or failure to start.
For an industrial control system requiring high reliability and a wide operating temperature range, how does the VIPER28HN's -40°C to 150°C (TJ) rating translate to practical application limits, particularly concerning thermal management and component derating for the 16W output?
The VIPER28HN's rated junction temperature (TJ) of 150°C means that during operation, the device's internal temperature should not exceed this limit. For industrial applications operating at the higher end of the -40°C to 150°C ambient or system temperature, careful thermal management is paramount. This includes ensuring adequate PCB copper area for heat dissipation, potentially using heatsinks attached to the 7-DIP package, and derating the 16W output power to stay within safe thermal limits. A thermal simulation or calculation is recommended to verify that the ambient temperature plus the device's self-heating remains well below the TJ maximum.
I'm considering the VIPER28HN for a consumer electronics power supply where cost is a major factor, but I also need robust fault protection. How effective are its integrated current limiting, over-temperature, over-voltage, and short-circuit protections in reducing the need for external protection circuitry?
The VIPER28HN's integrated fault protection mechanisms (current limiting, over-temperature, over-voltage, short-circuit) are designed to significantly simplify external protection circuitry. For many consumer applications, these internal protections can eliminate the need for dedicated external fuses, over-current comparators, and thermal shutdown components, thereby reducing BOM cost and board space. However, it's critical to understand the trip thresholds and response times of these internal protections and ensure they meet the specific safety requirements of your application. For extremely critical systems or where specific agency certifications demand redundant protection, supplementary external components might still be considered.
When replacing an older, non-SMD flyback controller in a legacy product with the VIPER28HN (packaged in 7-DIP tube), what are the primary design challenges related to pin compatibility, board layout modifications, and ensuring compliance with its 800V breakdown voltage rating?
Replacing a legacy non-SMD flyback controller with the VIPER28HN in a 7-DIP package requires careful consideration of pin assignments as pin-outs can vary significantly between manufacturers and even older part generations. Board layout modifications will likely be necessary to accommodate the 7-DIP footprint and ensure proper isolation clearances between the high-voltage and low-voltage sides, especially given the VIPER28HN's 800V breakdown voltage. Ensuring adequate creepage and clearance distances on the PCB is critical for safety and reliability in high-voltage applications. The original design's component values (e.g., R-C snubber, feedback resistors) may also need to be re-evaluated and adjusted for optimal performance with the VIPER28HN's characteristics.
In a battery charger application using the VIPER28HN, how can the 80% duty cycle limitation be managed to achieve optimal charge current regulation, especially when dealing with a wide input voltage range and varying battery voltages?
The VIPER28HN's 80% duty cycle limitation requires careful design to ensure it can deliver the required charge current across the entire input voltage range and varying battery voltages. For applications with a wide input voltage range, the transformer turns ratio and the flyback topology's inherent ability to provide variable output voltage become critical. When operating at low input voltages, you will be closer to the duty cycle limit. Therefore, the transformer ratio must be selected to allow sufficient output power at the lowest expected input voltage without exceeding the 80% duty cycle. This might necessitate a higher turns ratio, which in turn means the output voltage will be lower at higher input voltages, requiring careful output current regulation feedback.
For a product intended for use in a fluctuating mains voltage environment, what are the implications of using the VIPER28HN with its 115kHz switching frequency and 16W power rating on electromagnetic interference (EMI) and the potential need for extensive filtering?
The VIPER28HN's 115kHz switching frequency, while moderate, can still contribute to EMI. Designing for fluctuating mains voltage amplifies this concern, as power factor correction might be required, potentially introducing higher-frequency harmonics. To mitigate EMI effectively, a well-designed input filter (often an L-C filter) is essential. The transformer construction (shielding, winding techniques) and PCB layout (minimizing parasitic inductance, proper grounding) also play a crucial role in reducing radiated and conducted emissions. Careful component selection for the filter and adherence to layout best practices are critical for passing EMI standards.
If a VIPER28HN fails due to an over-voltage condition, what are the most likely root causes that a design engineer should investigate in the surrounding circuitry and the input power source?
If a VIPER28HN fails due to an over-voltage condition, common root causes in the surrounding circuitry include a failure in the primary-side feedback loop (e.g., faulty optocoupler or TL431), a transient voltage spike exceeding the 800V breakdown capability that wasn't adequately suppressed by external protection components, or a failure in the internal voltage sensing mechanism. On the input power source side, a severe mains surge, a lightning strike, or a failure in an input protection device (like a MOV) could lead to excessive voltage reaching the VIPER28HN. Investigating the specific fault signature and examining the state of nearby components is crucial.

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