VIPER35HDTR - 800V Off-Line High Voltage Converter | STMicroelectronics
MPN: VIPER35HDTR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.98 | $98.00 |
| 500 | $0.85 | $425.00 |
| 1,000 | $0.75 | $750.00 |
Drop-in alternatives for VIPER35HDTR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
VIPER35LDTR
β Drop-Inπ Reference alternative (not in catalog)
VIPER35HD
β Drop-Inπ Reference alternative (not in catalog)
VIPER35HDTR-1
β Drop-Inπ Reference alternative (not in catalog)
LNK304GN
β Drop-Inπ Reference alternative (not in catalog)
TNY274GN
β Drop-Inπ Reference alternative (not in catalog)
VIPER35HDTR Maximum Ratings & Electrical Characteristics
| Input Voltage Range | 85 VAC to 265 VAC |
| Output Power (Buck) | 8 W (230 VAC) |
| Output Power (Flyback) | 5 W (230 VAC) |
| Switching Frequency | 60 kHz |
| Breakdown Voltage | 800 V |
| RDS(on) | 11 ohm |
| Standby Power | < 50 mW at 265 VAC |
| Operating Junction Temperature | -40C to +150C |
| Package | SO-8 |
| Mounting Type | Surface Mount |
| Control Mode | Current Mode |
| Protection Features | OCP, OVP, Thermal Shutdown |
| Soft Start | Built-in |
| RoHS Status | Compliant |
| MSL Level | 1 |
VIPER35HDTR Pin Configuration
| Pin 1 | DRAIN β Power MOSFET drain |
| Pin 2 | DRAIN β Power MOSFET drain |
| Pin 3 | GND β Ground |
| Pin 4 | FB β Feedback input |
| Pin 5 | VCC β Supply voltage |
| Pin 6 | GND β Ground |
| Pin 7 | SOURCE β Power MOSFET source |
| Pin 8 | SOURCE β Power MOSFET source |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
VIPER35HDTR is suitable for 6 applications: Smart Meter Power Supply, Home Appliance Power Supply, Industrial Control System, LED Lighting Driver, Auxiliary Power Supply for IoT Devices, Battery Charger.
Smart Meter Power Supply
The VIPER35HDTR provides an efficient and compact power supply for smart meters, converting mains voltage to a regulated DC rail. Its wide input range (85-265VAC) ensures operation across global grids, while the low standby power (<50mW) meets energy regulations. The integrated 800V MOSFET and current-mode control deliver stable output for metering circuits. In a typical smart meter, the VIPER35HDTR is used in a flyback topology to generate isolated 5V and 3.3V rails for the microcontroller and communication modules. The high-voltage startup circuit eliminates external startup resistors, reducing component count. The burst-mode operation at light load minimizes power consumption during standby, extending the meter's operational life. The built-in protections (OCP, OVP, thermal shutdown) safeguard the meter against grid transients and overloads, ensuring long-term reliability in outdoor installations.
Recommended
Home Appliance Power Supply
The VIPER35HDTR is ideal for power supplies in home appliances such as washing machines, refrigerators, and air conditioners. It provides a cost-effective solution for generating auxiliary power rails (e.g., 5V, 12V) for control boards and user interfaces. The device's high efficiency and low standby power help appliances meet energy efficiency standards like Energy Star. In a washing machine, the VIPER35HDTR is used in a buck topology to step down the rectified mains to a 12V rail for the motor driver and a 5V rail for the microcontroller. The fixed 60kHz switching frequency simplifies EMI filter design, reducing board space. The thermal shutdown protection prevents damage during high-temperature operation, such as when the appliance is in a confined space. The wide input range ensures stable operation even with fluctuating grid voltages.
Recommended
Industrial Control System
In industrial control systems, the VIPER35HDTR provides a reliable power supply for PLCs, sensors, and actuators. Its wide input range and robust protections make it suitable for harsh industrial environments. The device's high breakdown voltage (800V) allows it to handle voltage spikes common in industrial settings. The VIPER35HDTR is used in a flyback topology to generate isolated power rails for field devices, ensuring safety and noise immunity. The current-mode control provides excellent line and load regulation, critical for sensitive control circuits. The built-in soft-start reduces inrush current during power-up, preventing stress on external components. The device's operating temperature range (-40C to +150C) ensures reliable operation in extreme conditions, such as in outdoor industrial installations.
Recommended
LED Lighting Driver
The VIPER35HDTR can be used in LED lighting drivers to convert mains voltage to a constant current or voltage for LED strings. Its high efficiency and low standby power make it suitable for energy-efficient lighting. The device's wide input range supports global lighting standards. In a typical LED driver, the VIPER35HDTR is used in a buck topology to provide a constant voltage rail, which is then regulated by a constant current LED driver IC. The 60kHz switching frequency allows for a small inductor, reducing the overall size of the driver. The burst-mode operation at light load reduces power consumption when the LED is dimmed, improving overall efficiency. The built-in protections ensure safe operation under fault conditions, such as LED short circuits or open circuits.
Recommended
Auxiliary Power Supply for IoT Devices
The VIPER35HDTR is suitable for auxiliary power supplies in IoT devices, such as smart home hubs and sensors. Its compact SO-8 package and low component count make it ideal for space-constrained designs. The low standby power (<50mW) is crucial for battery-backed or energy-harvesting systems. In an IoT device, the VIPER35HDTR is used in a flyback topology to generate isolated 3.3V and 5V rails for the microcontroller and wireless module. The high-voltage startup circuit reduces the number of external components, simplifying the design. The device's protections ensure reliable operation in always-on applications. The wide input range allows the device to be used in different regions without modification.
Recommended
Battery Charger
The VIPER35HDTR can be used in battery charger applications, providing a regulated output voltage for charging batteries. Its high efficiency and low standby power make it suitable for portable chargers. The device's wide input range supports universal input. In a battery charger, the VIPER35HDTR is used in a flyback topology to provide a constant voltage/current output, which is then controlled by a battery charging IC. The current-mode control ensures stable operation during constant current charging. The built-in protections prevent overcurrent and overvoltage conditions, protecting the battery and the charger. The device's low standby power reduces energy consumption when the charger is idle.
Recommended
Recommended Products Summary
Engineering reference data for VIPER35HDTR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | VIPER35LDTR | LNK304GN | TNY274GN |
|---|---|---|---|---|
| Package | SO-8 | SO-8 | SO-8 | SO-8 |
| Brand | STMicroelectronics | STMicroelectronics | Power Integrations | Power Integrations |
| Breakdown Voltage | 800 V | 650 V | 700 V | 700 V |
| Output Power (Buck) | 8 W | 8 W | 4 W | 6 W |
| Switching Frequency | 60 kHz | 60 kHz | 66 kHz | 132 kHz |
| RDS(on) | 11 ohm | 11 ohm | 23 ohm | 12 ohm |
| Standby Power | < 50 mW | < 50 mW | < 50 mW | < 50 mW |
| Protection Features | OCP, OVP, Thermal Shutdown | OCP, OVP, Thermal Shutdown | OCP, OVP, Thermal Shutdown | OCP, OVP, Thermal Shutdown |
Key Differentiators
- Higher breakdown voltage (800V) than VIPER35LDTR (vs VIPER35LDTR)
- Lower RDS(on) than LNK304GN (vs LNK304GN)
- Higher output power than LNK304GN (vs LNK304GN)
Design Notes
Ensure adequate copper area for thermal dissipation. The SO-8 package has a thermal resistance of 100 C/W; for 8W output, the power dissipation is around 2W, requiring at least 1 square inch of copper on the PCB. Place the device away from heat-sensitive components.
Keep the high-voltage DRAIN traces short and wide to minimize parasitic inductance and EMI. Maintain proper creepage distance between high-voltage and low-voltage pins. Use a snubber circuit across the transformer primary to reduce voltage spikes.
Do not exceed the maximum junction temperature of 150C. Ensure the feedback loop is properly compensated to avoid instability. The burst-mode operation at light load may cause audible noise; use a proper snubber or adjust the feedback network to mitigate.
Compliance Information
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified.
