Product overview
Description
The VIPER31 device is a high-voltage converter that smartly integrates an 800 V avalanche rugged power MOSFET with PWM current-mode control. The 800 V breakdown allows extended input voltage range to be applied, as well as to reduce the size of the DRAIN snubber circuit. The IC can meet the most stringent energy-saving standards as it has very low consumption and operates in pulse frequency modulation at light load. Overvoltage and undervoltage protections with separate and settable intervention thresholds are available at OVP and UVP pins respectively. UVP can also be used as a disabling input for the entire SMPS, with ultra-low residual input power consumption. Integrated HV startup, sense FET, error amplifier and oscillator with frequency jitter allow a complete application to be designed with a minimum component count. Flyback, buck and buck boost topologies are supported.
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All features
- 800 V avalanche-rugged power MOSFET to cover ultra-wide VAC input range
- Embedded HV startup and sense FET
- Current mode PWM controller
- Drain current limit protection (OCP):
- 710 mA (VIPER317)
- 850 mA (VIPER318)
- 990 mA (VIPER319)
- Wide supply voltage range: 4.5 V to 30 V
- < 20 mW @ 230 VAC in no-load;
- < 430 mW @ 230 VAC, 25 0mW output load
- Jittered switching frequency reduces the EMI filter cost:
- 30 kHz ± 7% (type X)
- 60 kHz ± 7% (type L)
- 132 kHz ±7% (type H)
- Embedded E/A with 1.2 V reference
- Built-in soft-start for improved system reliability
- Protections with automatic restart:
- overload/short-circuit (OLP)
- thermal shutdown
- overvoltage
- Protections without automatic restart:
- pulse-skip protection to avoid flux runaway
- undervoltage/disable
- max. duty cycle
eDesignSuite
eDesignSuite is a comprehensive set of easy-to-use design-aid utilities ready to help you streamline the system development process with a wide range of ST products.
Power Management Design Center
Thermal-electrical Simulators for Components
Signal Conditioning Design Tool
NFC/RFID Calculators
Choose design tool: 
Power Management Design Center
Power Supply Design Tool
• SMPS design, by topology, by type and by product
• PFC design with analog and digitial control
• Supports various PCB configurations
Choose type: DC/DC AC/DC Solar Battery Charger
Power Management Design Center
LED Lighting Design Tool
• Handles AC-DC and DC-DC design in common topologies
• Displays interactive and annotated schematic
• Provides current/voltage graphs, Bode plots, efficiency curves and power-loss data
Choose type: DC/DC AC/DC
Power Management Design Center
Digital Power Workbench
• Provides a step-by-step optimized design of power section and control loop
• Generates the STM32Cube embedded software package for custom applications and allows firmware project generation, compatible with multiple STM32 IDEs
Power Management Design Center
Power Tree Designer
• Specify input/output power for each node in the tree
• Check for consistency
• Design each individual node
Choose design tool: 
Thermal-electrical Simulators for Components
STPOWER Studio
• Supports long mission profiles
• Provides power loss and temperature graphs
• Helps define heatsink thermal properties
Thermal-electrical Simulators for Components
PCB Thermal Simulator
• Thermal analysis of a PCB from Gerber files.
• Possibility to add heat sources, heat sinks, copper areas and thermal paths.
• Powerful server-side engine for rendering and simulation.
• Thermal results shown graphically via 2D table.
Thermal-electrical Simulators for Components
AC Switches Simulator
• Select ratings and application waveforms
• Get junction temperature and blocking voltage graphs
• Search and sort suitable devices
Thermal-electrical Simulators for Components
Rectifier Diodes Simulator
• Select ratings and application waveforms
• Estimate power losses
• Search and sort suitable devices
Thermal-electrical Simulators for Components
Twister Sim
• Help select the right ViPOWER Automotive power device
• Supports load-compatibility, wiring harness optimization, fault condition impact and diagnostic analysis
• Supports various PCB configurations
Thermal-electrical Simulators for Components
TVS Simulator
• Specify system ratings and surge waveform
• Search and sort suitable devices
Thermal-electrical Simulators for Components
Estimate
• Build simple schematics and firmware inputs in minutes
• Quickly generate reliable estimates of battery life, system power consumption and bill of materials costs
Choose design tool: 
Signal Conditioning Design Tool
Active Filters
• Handles multi-stage-designs and common topologies
• Returns circuit component values
• Provides gain, phase and group delay graphs
• Low Pass, High Pass and Band Pass
Signal Conditioning Design Tool
Comparators
• Handles most common configurations
• Returns circuit components values
• Provides I/O signal waveforms
• Inverting, Non Inverting, Window
Signal Conditioning Design Tool
Low side Current Sensing
• Returns circuit component values
• Provides current error graphs
Signal Conditioning Design Tool
High side Current Sensing
• Provides current error graphs.
• Help to select the right High side current sensing and shunt devices.
Choose design tool: 
NFC/RFID Calculators
NFC Inductance
• Input geometry and substrate properties
• Get antenna impedance
NFC/RFID Calculators
UHF Link Budget
• Enter forward and reverse link characteristics
• The tool returns link budget estimate
NFC/RFID Calculators
NFC Tuning Circuit
• Enter antenna parameter and matching target
• Select the topology of the matching network
• The tool returns component values for the desired design targets
Recommended for you
EDA Symbols, Footprints and 3D Models
STMicroelectronics - VIPER31
Speed up your design by downloading all the EDA symbols, footprints and 3D models for your application. You have access to a large number of CAD formats to fit with your design toolchain.
Please select one model supplier :
Symbols
Footprints
3D models
All resources
| Resource title | Version | Latest update | Actions | Details | Download |
|---|
SPICE models (1)
| Resource title | Version | Latest update | Actions | Options | ||
|---|---|---|---|---|---|---|
| ZIP | 1.0 | 15 Apr 2020 | 15 Apr 2020 |
SIMPLIS models (1)
| Resource title | Version | Latest update | Actions | Options | ||
|---|---|---|---|---|---|---|
| ZIP | 2024.06 | 11 Jul 2025 | 11 Jul 2025 |
Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Longevity Commitment | Longevity Starting Date | Material Declaration** |
|---|---|---|---|---|---|---|---|
| VIPER317HDTR | Active Product is in volume production. | SO-16 | Industrial | Ecopack3 | 10 | 2025-09-19T00:00:00.000+02:00 | |
| VIPER317LDTR | Active Product is in volume production. | SO-16 | Industrial | Ecopack3 | 10 | 2025-09-19T00:00:00.000+02:00 | |
| VIPER318HDTR | Active Product is in volume production. | SO-16 | Industrial | Ecopack3 | 10 | 2025-09-19T00:00:00.000+02:00 | |
| VIPER318LDTR | Active Product is in volume production. | SO-16 | Industrial | Ecopack3 | 10 | 2025-09-19T00:00:00.000+02:00 | |
| VIPER318XDTR | Active Product is in volume production. | SO-16 | Industrial | Ecopack3 | 10 | 2025-09-19T00:00:00.000+02:00 | |
| VIPER319HC | Active Product is in volume production. | SO-16 | Industrial | Ecopack3 | 10 | 2025-09-19T00:00:00.000+02:00 | |
| VIPER319HCTR | Active Product is in volume production. | SO-16 | Industrial | Ecopack3 | 10 | 2025-09-19T00:00:00.000+02:00 | |
| VIPER319HDTR | Active Product is in volume production. | SO-16 | Industrial | Ecopack3 | 10 | 2025-09-19T00:00:00.000+02:00 | |
| VIPER319LDTR | Active Product is in volume production. | SO-16 | Industrial | Ecopack3 | 10 | 2025-09-19T00:00:00.000+02:00 | |
| VIPER319XDTR | Active Product is in volume production. | SO-16 | Industrial | Ecopack3 | 10 | 2025-09-19T00:00:00.000+02:00 |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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Sample & Buy
| Part Number | Marketing Status | Budgetary Price (US$)*/Qty | Order from ST | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating temperature (°C) | Operating Temperature (°C) (max) | Transistor Breakdown Voltage (V) (min) | Drain Current (A) (nom) | RDS(on) (Ω) (max) | ||
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| VIPER319XDTR | | | distributors No availability of distributors reported, please contact our sales office |
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| VIPER319HCTR | | | distributors No availability of distributors reported, please contact our sales office |
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| VIPER319HDTR | | | distributors No availability of distributors reported, please contact our sales office |
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| VIPER318XDTR | | | distributors No availability of distributors reported, please contact our sales office |
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| VIPER318HDTR | | | distributors No availability of distributors reported, please contact our sales office |
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| VIPER318LDTR | | | distributors No availability of distributors reported, please contact our sales office |
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| VIPER319HC | | | distributors No availability of distributors reported, please contact our sales office |
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| VIPER317LDTR | | | distributors No availability of distributors reported, please contact our sales office |
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| VIPER317HDTR | | | distributors No availability of distributors reported, please contact our sales office |
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| VIPER319LDTR | | | distributors No availability of distributors reported, please contact our sales office |
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VIPER319XDTR Active
Budgetary Price (US$)*/Qty:
-
distributors
No availability of distributors reported, please contact our sales office
Package:
Packing Type:
RoHS:
Country of Origin:
ECCN (US):
ECCN (EU):
VIPER319HCTR Active
Budgetary Price (US$)*/Qty:
-
distributors
No availability of distributors reported, please contact our sales office
Package:
Packing Type:
RoHS:
Country of Origin:
ECCN (US):
ECCN (EU):
VIPER319HDTR Active
Budgetary Price (US$)*/Qty:
-
distributors
No availability of distributors reported, please contact our sales office
Package:
Packing Type:
RoHS:
Country of Origin:
ECCN (US):
ECCN (EU):
VIPER318XDTR Active
Budgetary Price (US$)*/Qty:
-
distributors
No availability of distributors reported, please contact our sales office
Package:
Packing Type:
RoHS:
Country of Origin:
ECCN (US):
ECCN (EU):
VIPER318HDTR Active
Budgetary Price (US$)*/Qty:
-
distributors
No availability of distributors reported, please contact our sales office
Package:
Packing Type:
RoHS:
Country of Origin:
ECCN (US):
ECCN (EU):
VIPER318LDTR Active
Budgetary Price (US$)*/Qty:
-
distributors
No availability of distributors reported, please contact our sales office
Package:
Packing Type:
RoHS:
Country of Origin:
ECCN (US):
ECCN (EU):
VIPER319HC Active
Budgetary Price (US$)*/Qty:
-
distributors
No availability of distributors reported, please contact our sales office
Package:
Packing Type:
RoHS:
Country of Origin:
ECCN (US):
ECCN (EU):
VIPER317LDTR Active
Budgetary Price (US$)*/Qty:
-
distributors
No availability of distributors reported, please contact our sales office
Package:
Packing Type:
RoHS:
Country of Origin:
ECCN (US):
ECCN (EU):
VIPER317HDTR Active
Budgetary Price (US$)*/Qty:
-
distributors
No availability of distributors reported, please contact our sales office
Package:
Packing Type:
RoHS:
Country of Origin:
ECCN (US):
ECCN (EU):
VIPER319LDTR Active
Budgetary Price (US$)*/Qty:
-
distributors
No availability of distributors reported, please contact our sales office
Package:
Packing Type:
RoHS:
Country of Origin:
ECCN (US):
ECCN (EU):
(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors