VIPER37HDTR - 800V Offline High-Voltage Converter | STMicroelectronics
MPN: VIPER37HDTR 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 | $0.72 | $720.00 |
Drop-in alternatives for VIPER37HDTR 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:
VIPER37LDTR
β Drop-Inπ Reference alternative (not in catalog)
VIPER38HDTR
β Drop-Inπ Reference alternative (not in catalog)
VIPER37HE
β Drop-Inπ Reference alternative (not in catalog)
LNK304
β Drop-Inπ Reference alternative (not in catalog)
NCP1014
β Drop-Inπ Reference alternative (not in catalog)
VIPER37HDTR Maximum Ratings & Electrical Characteristics
| Output Power (wide input 85-265VAC) | 20 W |
| Output Power (European 230VAC) | 30 W |
| Breakdown Voltage | 800 V |
| Switching Frequency | 60 kHz |
| Standby Power | <50 mW |
| Operating Junction Temperature | -40C to +150C |
| Package | SO-8 |
| Mounting Type | Surface Mount |
| Thermal Resistance (theta_JA) | 85 C/W |
| Soft-Start | Built-in |
| Overvoltage Protection | Yes |
| Overcurrent Protection | Yes |
| Thermal Shutdown | Yes |
| RoHS Status | Compliant |
| MSL Level | 1 |
VIPER37HDTR Pin Configuration
| Pin 1 | VCC β Supply voltage for the controller |
| Pin 2 | GND β Ground |
| Pin 3 | FB β Feedback input for output regulation |
| Pin 4 | DRAIN β Drain of the integrated MOSFET |
| Pin 5 | DRAIN β Drain of the integrated MOSFET |
| Pin 6 | DRAIN β Drain of the integrated MOSFET |
| Pin 7 | DRAIN β Drain of the integrated MOSFET |
| Pin 8 | GND β Ground |
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
VIPER37HDTR is suitable for 6 applications: Auxiliary Power Supplies, LED Lighting Drivers, Smart Meters, Home Appliances, Industrial Control Systems, IoT Devices.
Auxiliary Power Supplies
The VIPER37HDTR provides a compact, efficient solution for auxiliary power supplies in home appliances, smart meters, and industrial control systems. Its 800V MOSFET and integrated controller reduce component count, while the low standby power (<50mW) helps meet energy-efficiency regulations. In a typical application, the VIPER37HDTR converts AC mains to a regulated DC output (e.g., 5V or 12V) to power microcontrollers, sensors, and communication interfaces. The wide input range (85-265VAC) ensures operation across global mains voltages. The built-in protection features (OVP, OCP, thermal shutdown) enhance reliability in harsh environments. Designers should ensure proper transformer design and feedback compensation to maintain stable operation across load variations.
Recommended
LED Lighting Drivers
The VIPER37HDTR is well-suited for LED lighting drivers, providing constant voltage or constant current output with high efficiency. Its 60kHz switching frequency allows for a compact transformer, reducing the overall size of the LED driver. The low standby power is beneficial for lighting systems that remain in standby mode. In a typical LED driver application, the VIPER37HDTR regulates the output to drive a string of LEDs, with feedback from the output to maintain constant current. The 800V MOSFET ensures reliable operation in mains-powered environments. Designers should consider thermal management, as the SO-8 package has a thermal resistance of 85Β°C/W, and may need to derate output power at high ambient temperatures.
Recommended
Smart Meters
Smart meters require reliable, efficient power supplies that operate continuously. The VIPER37HDTR's low standby power (<50mW) and wide input range make it ideal for this application. It provides a regulated DC supply for the metering IC, communication module, and display. The integrated protection features ensure long-term reliability in outdoor environments. In a smart meter, the VIPER37HDTR typically converts 85-265VAC to a 5V or 3.3V rail. The 60kHz switching frequency allows for a small transformer, fitting within the meter's compact enclosure. Designers should ensure proper isolation between the primary and secondary sides to meet safety standards.
Recommended
Home Appliances
The VIPER37HDTR is used in home appliances such as washing machines, refrigerators, and air conditioners for auxiliary power supplies. Its wide input range and low standby power help appliances meet energy-efficiency standards. The integrated 800V MOSFET provides robustness against mains transients. In a typical appliance, the VIPER37HDTR powers the control board, sensors, and user interface. The compact SO-8 package saves PCB space, and the built-in soft-start reduces inrush current. Designers should consider the thermal environment inside appliances, which may require derating or additional cooling.
Recommended
Industrial Control Systems
In industrial control systems, the VIPER37HDTR provides a reliable power supply for PLCs, sensors, and actuators. Its wide input range (85-265VAC) accommodates varying mains conditions, and the protection features (OVP, OCP, thermal shutdown) ensure safe operation in demanding environments. The 60kHz switching frequency reduces transformer size, enabling compact designs. In a typical industrial application, the VIPER37HDTR converts AC mains to a 24V or 12V DC rail. The low standby power is beneficial for systems that remain in standby mode. Designers should ensure proper isolation and EMI filtering to meet industrial standards.
Recommended
IoT Devices
The VIPER37HDTR is suitable for IoT devices that require a compact, efficient power supply from AC mains. Its low standby power (<50mW) is critical for always-on IoT devices that must minimize energy consumption. The wide input range allows operation in different regions. In a typical IoT device, the VIPER37HDTR provides a regulated DC supply for the microcontroller, wireless module, and sensors. The integrated 800V MOSFET and controller reduce component count, simplifying the design. Designers should consider the thermal constraints of the SO-8 package and may need to derate output power in enclosed environments.
Recommended
Recommended Products Summary
Engineering reference data for VIPER37HDTR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | VIPER37LDTR | VIPER38HDTR | LNK304 | NCP1014 |
|---|---|---|---|---|---|
| Package | SO-8 | SO-8 | SO-8 | SO-8 | SO-8 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Power Integrations | onsemi |
| Output Power (wide input) | 20 W | 10 W | 30 W | 12 W | 19 W |
| Breakdown Voltage | 800 V | 800 V | 800 V | 700 V | 700 V |
| Switching Frequency | 60 kHz | 60 kHz | 60 kHz | 66 kHz | 65 kHz |
| Standby Power | <50 mW | <50 mW | <50 mW | <50 mW | <100 mW |
| Protection Features | OVP, OCP, Thermal Shutdown | OVP, OCP, Thermal Shutdown | OVP, OCP, Thermal Shutdown | OVP, OCP, Thermal Shutdown | OVP, OCP, Thermal Shutdown |
| Pin Compatibility | Reference | Pin-compatible | Pin-compatible | Verify pinout | Verify pinout |
Key Differentiators
- Higher breakdown voltage (800V) than some competitors (vs LNK304)
- Lower standby power (<50mW) compared to NCP1014 (vs NCP1014)
- Same-brand family compatibility (vs VIPER37LDTR)
Design Notes
The VIPER37HDTR integrates an 800V MOSFET and PWM controller, simplifying the design of AC-DC power supplies. Ensure the transformer is designed for the 60kHz switching frequency to minimize core losses. The feedback loop must be compensated to maintain stability across the full load range. Use a proper snubber circuit to clamp voltage spikes from the transformer leakage inductance.
The SO-8 package has a thermal resistance of 85Β°C/W. At 20W output, the power dissipation can be significant, so ensure adequate PCB copper area for heat sinking. In high-temperature environments, derate the output power or add a heatsink. The junction temperature must not exceed 150Β°C.
Place the input capacitor, transformer, and output capacitor close to the VIPER37HDTR to minimize parasitic inductance. Use a solid ground plane for the primary side and keep the high-current paths short. For EMI compliance, add a common-mode choke and Y-capacitor at the input. Follow the layout guidelines in the ST application notes.
Compliance Information
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified. Halogen-free status not specified in the provided data.
