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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) - AC DC Converters, Offline Switchers > VIPER26HDTR
STMicroelectronics
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VIPER26HDTR

In Stock 20200 pcs Reference Price(In US Dollars)
1+
$4.7514
Manufacturer Part Number:
VIPER26HDTR
Manufacturer / Brand
STMicroelectronics
Part of Description:
IC OFFLINE SWITCH FLYBACK 16SO
Datasheets:
VIPER26HDTR(1).pdfVIPER26HDTR(2).pdfVIPER26HDTR(3).pdfVIPER26HDTR(4).pdfVIPER26HDTR(5).pdf
Lead Free Status / RoHS Status:
ROHS3 Compliant
Stock Condition:
New original, 20200 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number VIPER26HDTR
Manufacturer / Brand STMicroelectronics
Stock Quantity 20200 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 VIPER26HDTR Datasheets VIPER26HDTR Details PDF
VIPER26HDTR Details PDF for FR.pdf
VIPER26HDTR Details PDF for KR.pdf
VIPER26HDTR Details PDF for IT.pdf
VIPER26HDTR Details PDF for ES.pdf
VIPER26HDTR Details PDF for DE.pdf
Voltage - Supply (Vcc/Vdd) 11.5V ~ 23.5V
Voltage - Start Up 13 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 Either
Operating Temperature -40°C ~ 150°C (TJ)
Mounting Type Surface Mount
Internal Switch(s) Yes
Frequency - Switching 115kHz
Fault Protection Current Limiting, Over Temperature
Duty Cycle 70%
Control Features -
Base Product Number VIPER26

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

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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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VIPER26HDTR Product Details:

The VIPER26HDTR is a high-performance integrated circuit (IC) from STMicroelectronics, classified as a PMIC (Power Management Integrated Circuit) - AC/DC Converter, and part of the VIPer plus series. This offline flyback converter is designed to operate in a 115kHz switching frequency and can handle up to 20W of power.

The key features of the VIPER26HDTR include its ability to operate across a wide input voltage range of 11.5V to 23.5V, making it suitable for a variety of applications. It employs a flyback topology, which is a popular choice for offline power supply designs, allowing for efficient power conversion. The device is equipped with fault protection mechanisms, such as current limiting and over-temperature protection, ensuring reliable and safe operation.

One of the design challenges addressed by the VIPER26HDTR is the need for compact and efficient power supply solutions, particularly in applications where space is limited. The IC's small 16-SOIC (0.154", 3.90mm Width) package and surface mount design allow for easy integration into various electronic devices.

The VIPER26HDTR is RoHS-compliant, indicating its adherence to environmental regulations, and has a wide operating temperature range of -40°C to 150°C, making it suitable for use in harsh environments.

The primary advantages of the VIPER26HDTR include its high efficiency, robust fault protection, and compact form factor, which make it an attractive choice for a wide range of applications, such as power adapters, chargers, and industrial equipment.

In terms of compatibility, the VIPER26HDTR can be used as a replacement or alternative to other similar offline flyback converter ICs, providing design flexibility and options for engineers and product developers.

Equivalent Models:

- VIPER26HDS (Digi-Key Part Number: VIPER26HDDKR-ND)

- VIPER26HDT (Digi-Key Part Number: VIPER26HDKTR-ND)

- VIPER26HDDP (Digi-Key Part Number: VIPER26HDDPCT-ND)

These equivalent models share similar specifications and functionalities, offering design engineers the flexibility to choose the most suitable option for their specific requirements.

VIPER26HDTR Key Technical Attributes

Manufacturer Part Number: VIPER26HDTR

Manufacturer: STMicroelectronics

Series: VIPer plus

VIPER26HDTR Packing Size

Packaging Type: Digi-Reel

Package Material: Plastic

Package / Case: 16-SOIC (0.154", 3.90mm Width)

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

Electrical Properties: Supply Voltage: 11.5 V ~ 23.5 V, Output Power: 20W

VIPER26HDTR Application

This component is specifically designed for use in AC DC converters and offline switchers across various applications such as power supply units and energy management systems where efficient energy conversion is critical.

VIPER26HDTR Features

The VIPER26HDTR by STMicroelectronics is an integrated circuit within the PMIC - AC DC Converters, Offline Switchers category. It features a flyback topology with a switching frequency of 115kHz and a high breakdown voltage of 800V. The duty cycle can reach up to 70%, and the device comes equipped with internal switches. Fault protection is robust, offering current limiting and over-temperature protection to ensure the device operates reliably under stress. Startup voltage is standard at 13V, and it maintains moisture sensitivity at MSL level 3 (168 Hours).

VIPER26HDTR Quality and Safety Features

The VIPER26HDTR ensures reliable operation, built to comply with RoHS specifications for lead-free components, enhancing safety and environmental preservation. It also supports an extensive operating temperature range, thus remains stable under varying environmental stresses.

VIPER26HDTR Compatibility

This PMIC component employs a common 16-SO footprint making it compatible with generic surface-mount technology (SMT) for straightforward integration into various circuit designs.

VIPER26HDTR Datasheet PDF

For the most authoritative, detailed technical specifications and operational guidance, the datasheet for VIPER26HDTR is available for download on our website. Customers are encouraged to access and review this document to fully understand the capacities and constraints of this component.

Quality Distributor

IC-Components is a premium global distributor of STMicroelectronics products. We strongly recommend obtaining a quote through our website for VIPER26HDTR, ensuring access to high-quality and reliable components for your crucial circuit designs. Trust IC-Components, where quality meets exceptional customer service.

Frequently Asked Questions

Can the VIPER26HDTR be used as a drop-in replacement for the Power Integrations TNY268P in a 12W offline flyback design?
The VIPER26HDTR is not a direct drop-in replacement for the TNY268P due to differences in package type, pinout, and control architecture. The TNY268P uses a DIP-8 package with a different pin configuration and operates with a variable frequency control scheme, while the VIPER26HDTR is housed in a 16-SOIC package and uses fixed-frequency PWM at 115kHz. Additionally, the VIPER26HDTR requires an external startup resistor and has a higher Vcc range (11.5–23.5V), whereas the TNY268P integrates startup circuitry. Board layout, feedback loop design, and thermal management must be re-evaluated if migrating to the VIPER26HDTR.
What are the key design constraints when using the VIPER26HDTR in a universal input (85–265VAC) offline power supply?
When designing a universal input supply with the VIPER26HDTR, ensure the input bulk capacitor and rectifier can handle peak voltages up to ~375VDC. The internal 800V MOSFET supports this range, but the duty cycle is limited to 70%, requiring careful transformer turns ratio selection to maintain regulation at low-line input. Additionally, the 115kHz fixed switching frequency necessitates EMI filtering optimized for conducted emissions above 150kHz. The startup voltage threshold (11.5V) demands proper Vcc capacitor sizing and startup resistor calculation to avoid latch-up during brownout conditions.
Is the VIPER26HDTR suitable for battery-powered or low-standby-power applications such as smart plugs or IoT devices?
The VIPER26HDTR is not ideal for ultra-low standby power applications due to its relatively high quiescent current and lack of burst-mode operation. While it supports fault protection and over-temperature shutdown, its fixed 115kHz switching frequency results in higher switching losses at light loads compared to controllers with frequency foldback or skip-mode features. For smart plugs targeting <30mW standby consumption, consider alternatives like the STCH02 or VIPer0P series with integrated high-voltage startup and advanced light-load efficiency modes.
How does the thermal performance of the VIPER26HDTR in a 16-SOIC package affect long-term reliability in enclosed industrial environments?
The VIPER26HDTR’s 16-SOIC package has limited thermal dissipation capability (~80°C/W junction-to-ambient), making it sensitive to ambient temperature rise in enclosed industrial enclosures. At full 20W output, even moderate ambient temperatures (>50°C) can push the junction temperature close to the 150°C limit, especially without copper pour or thermal vias. For long-term reliability, ensure adequate PCB copper area under the device, avoid stacking heat-generating components nearby, and consider derating output power above 60°C ambient. Active cooling or metal-core PCBs may be required in high-temperature installations.
Can the VIPER26HDTR support secondary-side regulation (SSR) without an optocoupler in a flyback converter?
The VIPER26HDTR does not natively support secondary-side regulation without an optocoupler. It relies on primary-side feedback via a bias winding and internal error amplifier referenced to the Vcc rail. While this simplifies design, it limits regulation accuracy (±5–8%) due to transformer tolerance and load-dependent effects. For tighter output voltage control (<±3%), an optocoupler and TL431-based feedback network must be added, increasing component count. The VIPER26HDTR’s internal compensation network must also be re-tuned when adding optocoupler feedback to ensure stability.
What are the risks of replacing a failed VIPER26HDTR with a cheaper generic 800V offline switcher in a medical-grade power supply?
Replacing the VIPER26HDTR with a generic 800V offline switcher in a medical application introduces significant compliance and reliability risks. The VIPER26HDTR is qualified for industrial temperatures (-40°C to 150°C) and includes robust fault protections (over-temperature, current limiting) validated under STMicroelectronics’ quality processes. Generic alternatives may lack consistent parametric performance, EMI characteristics, or long-term reliability data. Additionally, medical standards (e.g., IEC 60601-1) require documented component traceability and risk management, which generic parts often cannot provide. Always use the original VIPER26HDTR or an approved alternate with full qualification data.
How should the startup resistor for the VIPER26HDTR be calculated when operating from a 230VAC input with minimal standby loss?
The startup resistor for the VIPER26HDTR must charge the Vcc capacitor from the high-voltage DC bus until the device reaches the 13V startup threshold. For a 230VAC input (≈325VDC peak), use two 1MΩ, 1W resistors in series to limit power dissipation and meet creepage requirements. Total resistance should allow ~100–200µA startup current: R_total ≈ (325V – 13V) / 150µA ≈ 2.1MΩ. Power dissipation per resistor is ~(325V)^2 / (2 × 1MΩ) ≈ 52mW, well within rating. Ensure resistors are rated for high-voltage surge (e.g., 1500V impulse) and placed with adequate spacing to prevent arcing.
Can the VIPER26HDTR be used in a non-isolated buck configuration for cost-sensitive LED drivers?
The VIPER26HDTR is not recommended for non-isolated buck topologies. It is optimized for flyback converters with galvanic isolation and relies on transformer-based energy transfer. Attempting to configure it as a buck converter would bypass its internal control logic, disable fault protection mechanisms, and likely result in unstable operation due to mismatched feedback dynamics. For non-isolated LED drivers, consider dedicated buck controllers like the HVLED001A or AL8860, which offer better efficiency, dimming compatibility, and simpler magnetics.
What are the implications of the VIPER26HDTR’s 115kHz fixed frequency on EMI compliance in consumer electronics?
The VIPER26HDTR’s fixed 115kHz switching frequency simplifies transformer design but places harmonic content directly in the CISPR 22/32 conducted EMI band (150kHz–30MHz). This requires careful input filter design with X-capacitors, common-mode chokes, and damping networks to suppress emissions. Unlike frequency-jittering controllers, the VIPER26HDTR does not spread spectral energy, increasing peak emission levels. Pre-compliance testing is essential, and snubber circuits across the primary winding may be needed to reduce ringing-induced noise. Ensure PCB layout minimizes high-di/dt loops to avoid radiated EMI issues.
Is it safe to operate the VIPER26HDTR continuously at 20W output in an ambient temperature of 70°C without a heatsink?
Operating the VIPER26HDTR continuously at 20W in 70°C ambient without a heatsink risks exceeding the 150°C junction temperature limit. With a typical RθJA of 80°C/W for the 16-SOIC package, power dissipation of ~2.5W (including switching and conduction losses) results in ΔT ≈ 200°C, pushing Tj to ~270°C—far beyond safe limits. Even with optimistic 1.5W dissipation, Tj ≈ 70°C + (1.5W × 80°C/W) = 190°C. Derating to ≤12W or adding thermal copper area, vias, or a small heatsink is mandatory for reliable operation at elevated temperatures.

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