Counterfeit and defect prevention
Visual and packaging inspection
Electrical performance verification
Service Email:
[email protected]
>
VIPER35HD
STMicroelectronics
IC OFFLINE SWITCH FLYBACK 16SO
1237 Pcs New Original In Stock
Converter Offline Flyback Topology 225kHz 16-SO
Request Quote
(Ships tomorrow)
*Quantity
Minimum 1
Minimum 1
5.0 / 5.0
- (459 Ratings)
VIPER35HD
Product Overview
8167339
DiGi Electronics Part Number
VIPER35HD-DGManufacturer
STMicroelectronics
VIPER35HD
Description
IC OFFLINE SWITCH FLYBACK 16SOInventory
1237 Pcs New Original In Stock
Converter Offline Flyback Topology 225kHz 16-SO
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
How to Order
Shipping & Delivery
Quality Assurance
365 - Day Quality Guarantee - Every part fully backed.
90 - Day Refund or Exchange - Defective parts? No hassle.
Limited Stock, Order Now - Get reliable parts without worry.
Global Shipping & Secure Packaging
Worldwide Delivery in 3-5 Business Days
100% ESD Anti-Static Packaging
Real-Time Tracking for Every Order
Secure & Flexible Payment
Credit Card, VISA, MasterCard, PayPal, Western Union, Telegraphic Transfer(T/T) and more
All payments encrypted for security
VIPER35HD Technical Specifications
Category
Power Management (PMIC), AC DC Converters, Offline Switches
Packaging
Tube
Series
-
Product Status
Active
Output Isolation
Isolated
Internal Switch(s)
Yes
Voltage - Breakdown
800V
Topology
Flyback
Voltage - Start Up
14 V
Voltage - Supply (Vcc/Vdd)
8.5V ~ 23.5V
Duty Cycle
-
Frequency - Switching
225kHz
Power (Watts)
22 W
Fault Protection
Current Limiting, Over Temperature, Over Voltage, Short Circuit
Control Features
-
Operating Temperature
-40°C ~ 150°C (TJ)
Package / Case
16-SOIC (0.154", 3.90mm Width)
Supplier Device Package
16-SO
Mounting Type
Surface Mount
Base Product Number
VIPER35
Datasheet & Documents
HTML Datasheet
VIPER35HD-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
497-16074-5
-497-16074-5
Standard Package
50
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
物流速度快到令人驚喜，從下單到收貨只花了很短的時間，效率滿分！
December 02, 2025
欲しい商品が必ず見つかる豊富な選択肢と、リーズナブルな価格設定に感謝しています。
December 02, 2025
Their responsive customer service team always addresses our concerns promptly.
December 02, 2025
Fast shipping and long-lasting quality make DiGi Electronics a trusted partner in my projects.
December 02, 2025
DiGi Electronics' transparent prices help me budget effectively while shopping.
December 02, 2025
Their proactive communication and ample stock availability keep our operations running smoothly.
December 02, 2025
Their warranty and support policy are transparent and reassuring, reflecting their confidence in their products' reliability.
December 02, 2025
The after-sales team at DiGi Electronics was very attentive. They followed up a week after delivery to ensure everything was functioning well.
Publish Evalution
Evalution Message
Please enter your review message.
Please post honest comments and do not post ilegal comments.
Frequently Asked Questions (FAQ)
When designing in the VIPER35HD for a sealed industrial power supply, what thermal derating considerations should I account for above 100°C ambient temperature?
The VIPER35HD supports up to 150°C junction temperature, but in sealed enclosures with limited airflow, thermal buildup can be significant. At ambient temperatures above 100°C, reduce the maximum load by at least 20–30% to avoid triggering the internal thermal shutdown. Use a ground plane with thermal vias under the exposed pad to improve heat dissipation. Additionally, monitor TJ during burn-in testing to validate long-term reliability, especially when operating near the upper end of the industrial temperature range.
Can the VIPER35HD safely replace a VIPER26HG in a 15W auxiliary power supply, and what circuit adjustments are required?
Yes, the VIPER35HD can replace the VIPER26HG in 15W designs, offering headroom in both power capability (22W) and breakdown voltage (800V vs. 730V). However, ensure the startup resistor network is recalculated to accommodate the VIPER35HD’s 14V startup threshold and 8.5–23.5V Vcc range. Adjust the auxiliary winding turns ratio if Vcc rises above 23.5V under regulation. Also, verify that the existing snubber circuit can handle the higher 225kHz switching frequency to avoid MOSFET voltage overshoot and EMI issues.
How does the built-in OVP in the VIPER35HD respond to sustained overvoltage transients on the output, and is external crowbar protection still necessary?
The VIPER35HD includes internal overvoltage protection that latches off the IC during sustained OVP events, requiring a power cycle to reset. While this protects against output regulation failures, it does not actively clamp the output. For mission-critical systems where downstream components are sensitive to transient overvoltage (e.g., microcontrollers), adding an external TVS diode on the secondary side or a Zener-based clamp is recommended to absorb fast transients before the feedback loop reacts.
What are the layout risks when using the VIPER35HD in a high-noise factory automation environment, and how can EMI susceptibility be minimized?
The VIPER35HD’s 225kHz switching frequency can couple noise into sensitive control circuits if PCB layout isn’t optimized. Keep high dv/dt nodes (drain, bootstrap) as short as possible and avoid routing near feedback or sensing traces. Use a dedicated ground plane for signal references separate from power ground, connected at a single point near the IC. Include a 100nF ceramic decoupling capacitor close to VDD and GND pins, and consider adding a 10Ω series resistor in the bootstrap path to dampen ringing. These steps reduce the risk of erratic switching or false fault triggering.
When replacing a Power Integrations TOP247PN with the VIPER35HD in a 20W flyback converter, what are the trade-offs in efficiency and BOM complexity?
Replacing the TOP247PN with the VIPER35HD offers improved efficiency at light loads due to the VIPER35HD’s advanced burst-mode operation and lower quiescent current. The 800V breakdown also reduces avalanche stress under line surges. However, the VIPER35HD requires an external startup resistor network, increasing BOM count slightly compared to the integrated high-voltage start-up in the TOP247PN. Additionally, adjust the current-sense resistor value to match the VIPER35HD’s 0.85A typical current limit, ensuring consistent power delivery while maintaining fault protection accuracy.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
VIPER35HD CAD Models
STMicroelectronics VIPER35HD PCB symbols & footprints
productDetail
