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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) - AC DC Converters, Offline Switchers > VIPER25HDTR
STMicroelectronics
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VIPER25HDTR

In Stock 32415 pcs Reference Price(In US Dollars)
1+
$0.6569
Manufacturer Part Number:
VIPER25HDTR
Manufacturer / Brand
STMicroelectronics
Part of Description:
IC OFFLINE SWITCH FLYBACK 16SO
Datasheets:
VIPER25HDTR(1).pdfVIPER25HDTR(2).pdfVIPER25HDTR(3).pdf
Lead Free Status / RoHS Status:
ROHS3 Compliant
Stock Condition:
New original, 32415 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number VIPER25HDTR
Manufacturer / Brand STMicroelectronics
Stock Quantity 32415 pcs Stock
Category Integrated Circuits (ICs) > Power Management (PMIC) - AC DC Converters, Offline Switchers
Description IC OFFLINE SWITCH FLYBACK 16SO
Lead Free Status / RoHS Status: ROHS3 Compliant
RFQ VIPER25HDTR Datasheets VIPER25HDTR Details PDF
VIPER25HDTR Details PDF for FR.pdf
VIPER25HDTR Details PDF for KR.pdf
VIPER25HDTR Details PDF for IT.pdf
VIPER25HDTR Details PDF for ES.pdf
VIPER25HDTR Details PDF for DE.pdf
Voltage - Supply (Vcc/Vdd) 8.5V ~ 23.5V
Voltage - Start Up 14 V
Voltage - Breakdown 800V
Topology Flyback
Supplier Device Package 16-SO
Series VIPer™ plus
Power (Watts) 20 W
Package / Case 16-SOIC (0.154', 3.90mm Width)
Package Tape & Reel (TR)
Output Isolation Isolated
Operating Temperature -40°C ~ 150°C (TJ)
Mounting Type Surface Mount
Internal Switch(s) Yes
Frequency - Switching 225kHz
Fault Protection Current Limiting, Over Temperature, Over Voltage
Duty Cycle -
Control Features -
Base Product Number VIPER25

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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VIPER25HDTR Product Details:

The VIPER25HDTR is a highly versatile integrated circuit (IC) manufactured by STMicroelectronics, primarily designed for offline AC-DC power conversion applications. As a member of the VIPer plus series, this device offers a comprehensive set of features and capabilities that make it an ideal choice for a wide range of power supply designs.

Functionality-wise, the VIPER25HDTR is a Flyback topology converter operating at a switching frequency of 225kHz, capable of delivering up to 20 watts of power. It is equipped with an internal switch, making it a self-contained solution for offline power conversion. The device's operating voltage range of 8.5V to 23.5V, along with its high breakdown voltage of 800V, ensures its suitability for a variety of input voltage conditions.

Regarding design challenges, the VIPER25HDTR addresses the need for efficient and reliable power conversion in applications where space constraints and thermal management are critical. Its compact 16-SO package and surface-mount design make it easy to integrate into compact power supply designs, while its wide operating temperature range of -40°C to 150°C (junction temperature) enables operation in diverse environmental conditions.

The key specifications of the VIPER25HDTR include its offline Flyback converter topology, 225kHz switching frequency, and 20-watt power output capability. Additionally, the device offers essential fault protection features, such as current limiting, over-temperature protection, and over-voltage protection, ensuring reliable and safe operation.

The primary advantages of the VIPER25HDTR lie in its comprehensive functionality, compact design, and robust protection features. It is well-suited for a wide range of power supply applications, including consumer electronics, industrial equipment, and medical devices, where efficient and reliable power conversion is crucial.

The VIPER25HDTR is a RoHS-compliant, lead-free device, making it an environmentally-friendly option for power supply designs. It is available in a 16-SO package and is packaged in tape and reel format, facilitating automated assembly processes.

Regarding equivalent or alternative models, the VIPER25HDTR can be considered a member of the VIPer plus series, which includes similar devices with varying power output capabilities and feature sets. Some of the equivalent or alternative models within the VIPer plus series include the VIPER25, VIPER27, and VIPER30, each catering to different power output requirements and design considerations.

VIPER25HDTR Image
VIPER25HDTR (1)

VIPER25HDTR Key Technical Attributes

Manufacturer Part Number: VIPER25HDTR

Manufacturer: STMicroelectronics

Main Category: Integrated Circuits (ICs)

Small Classification: PMIC - AC DC Converters, Offline Switchers

VIPER25HDTR Packing Size

Type: tape and reel

Material: Moisture Sensitivity Level 1

Size: 16-SOIC (0.154", 3.90mm width)

Pin Configuration: SOP-16

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

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

VIPER25HDTR Application

Used in offline switching applications requiring isolated output, such as power supplies, adapter, and LED drivers. Suitable for embedded solutions where space and energy efficiency are critical.

VIPER25HDTR Features

The VIPER25HDTR is a converter with offline flyback topology which operates at a frequency of 225 kHz with a breakdown voltage up to 800V. It includes fault protection features such as over-temperature, over-voltage, and current limiting which enhance the device’s reliability and durability in harsh electrical environments. An internal switch is included, robust enough to handle power up to 20 watts, facilitating a more compact circuit design.

VIPER25HDTR Quality and Safety Features

This model boasts a Moisture Sensitivity Level (MSL) of 1, implying unlimited floor life under standard ambient conditions making it suitable for extended use without degradation. It adheres to RoHS compliance, making it a safe choice for environmentally aware applications as it is lead-free.

VIPER25HDTR Compatibility

Designed to seamlessly integrate within systems requiring SOP-16 package with the given dimensions and pin configuration. It can be mounted on the surface, making it compatible with standard automated assembly processes.

VIPER25HDTR Datasheet PDF

The most accurate datasheet available for the VIPER25HDTR is found on our website. To ensure you are accessing detailed and correct specifications for your product model, please download the datasheet directly from the current page.

Quality Distributor

IC-Components is a premium, respected distributor for STMicroelectronics. We offer competitive pricing and expert advice, ensuring you select the perfect components for your needs. Visit us today to find out more and to get a quote tailored to your requirements – trust us for all your component needs!

Frequently Asked Questions

What are the key design constraints when integrating the VIPER25HDTR into a high-reliability industrial power supply requiring operation across a wide temperature range?
The VIPER25HDTR supports an operating junction temperature range of -40°C to 150°C, making it suitable for industrial environments. However, designers must ensure adequate PCB copper area for thermal dissipation and avoid exceeding the 20W output power limit under worst-case ambient conditions. At elevated temperatures, derating of output power is recommended due to internal switch limitations and reduced efficiency. Additionally, the startup voltage of 14V requires careful consideration of Vcc supply stability during cold-start scenarios.
Can the VIPER25HDTR be used to replace an older non-ST offline switcher like the Power Integrations TNY280GN in a 15W flyback design, and what modifications are necessary?
While both devices target similar power levels, direct replacement of the TNY280GN with the VIPER25HDTR is not drop-in compatible due to differences in pinout, control architecture, and feedback implementation. The VIPER25HDTR uses primary-side regulation with built-in current-mode control and requires external optocoupler feedback for precise regulation, whereas the TNY280GN integrates secondary-side feedback. Design changes to the feedback network, transformer turns ratio, and compensation circuitry will be required to maintain stability and meet output accuracy targets.
What are the risks of operating the VIPER25HDTR near its maximum switching frequency of 225kHz in EMI-sensitive applications such as medical or automotive systems?
Operating at the fixed 225kHz switching frequency increases the risk of conducted and radiated emissions overlapping with sensitive frequency bands (e.g., AM radio, wireless comms). While the VIPER25HDTR includes soft-start and frequency jitter features to mitigate EMI, additional filtering, shielding, and careful PCB layout are essential in EMI-critical designs. For applications requiring spread-spectrum or lower frequency operation, consider alternative controllers with adjustable frequency or dedicated EMI optimization modes.
How does the internal 800V breakdown voltage of the VIPER25HDTR influence transformer design and safety isolation in offline flyback converters?
The 800V breakdown rating allows the VIPER25HDTR to handle high-voltage transients from line surges and leakage inductance spikes in universal input (85–265VAC) designs. This enables use of smaller, lower-cost transformers with reduced primary-to-secondary creepage requirements. However, the designer must still ensure the transformer meets reinforced isolation standards (e.g., IEC 60950 or 62368) and that the total peak voltage—including reflected output voltage and ringing—does not exceed 80% of the 800V rating under all fault conditions.
Is the VIPER25HDTR suitable for battery-powered or low-standby-power applications requiring ultra-low no-load consumption?
No, the VIPER25HDTR is not optimized for ultra-low standby power due to its minimum startup voltage of 14V and relatively high quiescent current. In battery-powered or green-energy applications where standby consumption below 30mW is required, consider alternatives like the STCH01 or VIPer0P series, which feature advanced burst-mode operation and lower startup thresholds. The VIPER25HDTR is better suited for mains-powered, always-on industrial or consumer AC-DC adapters.
What protection features does the VIPER25HDTR offer, and how do they impact system reliability in field-deployed equipment?
The VIPER25HDTR includes integrated current limiting, over-temperature shutdown, and over-voltage protection (OVP), enhancing robustness in harsh environments. These protections help prevent catastrophic failure during output short circuits, input surges, or thermal overloads. However, OVP is typically triggered via external circuitry (e.g., Zener + optocoupler), so proper design of the feedback loop and protection threshold is critical to avoid nuisance tripping or delayed response in long-term deployments.
Can the VIPER25HDTR support multiple output voltages in a single flyback design, and what design trade-offs should be considered?
Yes, the VIPER25HDTR can support multiple outputs using a multi-winding flyback transformer, but cross-regulation becomes a significant challenge—especially under varying load conditions on individual rails. Tight regulation on auxiliary outputs typically requires post-regulation (e.g., LDOs or DC-DC modules), increasing cost and complexity. For designs requiring tightly regulated dual or triple outputs, a dedicated multi-output controller or post-regulator topology may be more effective than relying solely on the VIPER25HDTR’s primary-side regulation.
What are the implications of the VIPER25HDTR’s surface-mount SOP-16 package (16-SOIC) for high-volume manufacturing and long-term reliability in industrial PCBs?
The 16-SOIC package (3.90mm width) is suitable for automated pick-and-place assembly and complies with MSL 1 (unlimited floor life), simplifying logistics and reducing moisture-related defects during reflow. However, its thermal resistance (θJA ≈ 60°C/W) demands sufficient thermal vias and copper pours to maintain junction temperature within limits. In high-vibration or thermal-cycling environments, ensure solder joint integrity through proper pad design and avoid mechanical stress on the package leads.
How does the VIPER25HDTR’s primary-side regulation (PSR) affect output voltage accuracy compared to optocoupler-based feedback in precision power supplies?
The VIPER25HDTR uses primary-side regulation to estimate output voltage via auxiliary winding feedback, eliminating the need for an optocoupler. While this reduces component count and cost, typical output accuracy is ±5–7%, which may not meet requirements for precision analog or digital loads. For tighter regulation (<±3%), an optocoupler-based feedback loop must be implemented externally, adding complexity but improving line and load regulation performance.
Are there pin-compatible or functionally similar alternatives to the VIPER25HDTR from other manufacturers that offer improved efficiency or smaller footprint?
Direct pin-compatible alternatives are limited due to the VIPER25HDTR’s unique 16-SOIC package and internal architecture. However, functionally similar devices include the ON Semiconductor NCP1361 (in SOIC-8, lower pin count but reduced integration) and the Power Integrations LinkSwitch-XT2 (in eSIP or SO-8, higher efficiency at light loads). Each alternative involves trade-offs in integration level, protection features, and design complexity—evaluate based on specific efficiency, cost, and board space requirements.

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