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STMicroelectronics VIPER38HE
- Part No.:
- VIPER38HE
- Manufacturer:
- STMicroelectronics
- Category:
- AC DC Converters, Offline Switches
- Package:
- 10-SDIP (0.300", 7.62mm)
- Datasheet:
-
VIPER38HE.pdf
- Description:
- IC OFFLINE SWITCH FLYBACK 10DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,990
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Product details
Overview
VIPER38HE from STMicroelectronics is a high-voltage PWM current-mode controller IC integrating an 800 V avalanche-rugged N-channel power MOSFET, embedded HV startup generator, and adjustable dual-level overcurrent protection (IDlim = 1.15 A typ, IDMAX = 1.7 A). It delivers up to 30 W peak power in open-frame flyback designs at 230 Vac input and achieves 30 mW no-load consumption. Used in auxiliary power supplies for smart meters and home equipment.
For engineers reviewing the VIPER38HE datasheet, VIPER38HE pinout, VIPER38HE application, or VIPER38HE equivalent, key selection criteria include its 800 V drain breakdown, SDIP10 package thermal performance (RTH-JC = 5 °C/W), jittered 60/115 kHz oscillator, EPT-enabled overload tolerance, and dual OCP thresholds for transformer saturation and secondary diode short-circuit protection.
Technical Context
The VIPER38HE implements a current-mode PWM control architecture with integrated SenseFET for lossless primary-side current sensing and a jittered oscillator (±4 kHz or ±8 kHz modulation depth) to reduce conducted EMI. Its gate driver provides controlled turn-on/turn-off slew rates to minimize common-mode noise.
Operation includes burst mode below 0.6 V on FB pin (VFBbm = 0.6 V typ), soft-start (tSS = 8.5 ms typ), and auto-restart after fault clearance. Protection functions are tightly coordinated: thermal shutdown triggers at 155 °C (TSD = 150–160 °C), with 30 °C hysteresis, while OVP uses digital strobing (tSTROBE = 2 μs) and tight 3.0 V threshold (VOVP = 2.7–3.3 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Drain voltage rating | 800 V - Enables direct connection to universal AC input (85–265 Vac) without external pre-regulator or voltage divider. |
| Peak output power | 30 W (peak, 2 sec) - Supports transient load surges in energy meter auxiliary rails and smart home adapter applications. |
| No-load consumption | 30 mW at 230 Vac - Meets stringent EU CoC Tier 2 and DOE Level VI standby efficiency requirements. |
| Oscillator frequency | 60 kHz (L-type) or 115 kHz (H-type) - Higher frequency enables smaller magnetics; jitter reduces EMI peak emissions by spreading spectrum. |
| Dual OCP thresholds | IDlim = 1.15 A (cycle-by-cycle), IDMAX = 1.7 A (hiccup mode) - Prevents transformer saturation under light-load overvoltage and handles secondary diode shorts safely. |
| Thermal shutdown | 155 °C trip, 30 °C hysteresis - Ensures reliable recovery after sustained overload without latch-up or thermal runaway. |
| EPT timeout | Configurable via external capacitor - Sustains 130% overload for 2–5 seconds, enabling compatibility with motor-start or inrush-limited loads. |
Pinout & Package
VIPER38HE is housed in a thermally enhanced SDIP10 (10-lead Small Outline Dual In-line Package) with exposed DRAIN pads for direct PCB copper heat sinking. The package features low junction-to-case thermal resistance (RTH-JC = 5 °C/W) when mounted on ≥100 mm² of 35 μm Cu.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 GND | Power MOSFET source & controller ground reference | Common return path for sense current and logic; must be low-inductance connection to minimize noise coupling into FB/CONT. |
| 3, 4 N.C. | No internal connection | Unused pins; electrically isolated - leave unconnected or tie to GND only if required for mechanical stability. |
| 5 VDD | Controller supply rail | Powered by internal HV startup current (−3 mA typ); clamped at 23.5 V; UVLO disables operation below 8 V. |
| 6 CONT | Current limit adjustment / OVP monitoring input | Resistor-to-GND sets IDlim; voltage >5 V triggers OVP shutdown with digital noise filtering - eliminates false trips from line transients. |
| 7 FB | Feedback regulation input | Sourced current (−200 μA typ) enables optocoupler-based loop control; 0.6 V threshold initiates burst mode for ultra-low standby power. |
| 8 EPT | Extra Power Timer timing node | Capacitor-to-GND sets overload hold time (2–5 s); pin floats during normal operation - critical for surge-tolerant adapters. |
| 9–12 N.C. | No internal connection | Unused; no electrical function - avoid routing signals nearby to prevent capacitive coupling. |
| 13–16 DRAIN | High-voltage power switch drain | Carries full primary current and HV startup bias; connected to metal frame for thermal conduction - requires ≥200 mm² copper pour underneath. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 800 V avalanche-rugged MOSFET | Eliminates need for external HV switch and startup resistor - reduces BOM count by ≥4 components in flyback designs. |
| Jittered oscillator with ±4/±8 kHz modulation | Reduces EMI filter size and cost by lowering peak spectral amplitude - meets EN55022 Class B without Y-cap or common-mode choke. |
| Adjustable extra power timer (EPT) | Enables 2–5 second overload hold before hiccup restart - supports brief inrush currents in smart meter PLC modules and IoT gateway power rails. |
| Dual-level overcurrent protection | IDlim (1.15 A) prevents transformer saturation; IDMAX (1.7 A) triggers hiccup mode for secondary faults - avoids catastrophic failure during diode short. |
| Digital strobed overvoltage protection | 2 μs strobe window rejects fast transients; 3.0 V threshold ensures stable 12 V or 5 V output regulation even with poor optocoupler CTR drift. |
Applications
| Smart Energy Meters | Home Appliance Auxiliary Supplies |
|---|---|
|
Use Scenario: Provides isolated 5 V/12 V rail for metrology IC, PLC modem, and real-time clock in DIN-rail energy meters operating across 85–265 Vac input. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller with integrated HV switch and burst-mode operation for <30 mW standby compliance. Use Value: Eliminates external HV startup network and reduces transformer turns ratio - cuts bill-of-materials cost by 12% vs discrete controller + MOSFET solutions. |
Use Scenario: Powers MCU, display, and sensor interface in washing machines and air conditioners where space-constrained PCB layout demands minimal component count. IC Role / Device Role / Timing Role: High-voltage PWM controller with soft-start (8.5 ms) and thermal shutdown (155 °C) to withstand ambient temperatures up to 70 °C. Use Value: SDIP10 package's 5 °C/W RTH-JC enables 20 W continuous output without heatsink - reduces system height by 4 mm vs SO16N alternatives. |
| Industrial IoT Gateways | USB-C Adapter Auxiliary Rails |
|
Use Scenario: Generates 3.3 V/5 V bias for Ethernet PHY, Wi-Fi module, and secure element in edge gateways deployed in factory environments with wide temperature swings. IC Role / Device Role / Timing Role: Current-mode controller with jittered 115 kHz switching and digital OVP strobing for robust operation amid EMI-rich industrial noise. Use Value: Dual OCP thresholds (1.15 A / 1.7 A) protect against both partial winding shorts and full secondary diode failures - extends field reliability beyond 10 years. |
Use Scenario: Supplies 5 V auxiliary power to USB-C PD controller and level-shifters in compact travel adapters handling 100 W main output. IC Role / Device Role / Timing Role: Peak-power capable (30 W) flyback controller with EPT timer to sustain 150% load during PD negotiation bursts. Use Value: 30 mW no-load consumption directly contributes to meeting IEC 62368-1 no-load loss limits - avoids costly redesign for global certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICE3B0565J | 650 V MOSFET, fixed 65 kHz frequency, no EPT or jitter - higher EMI risk and lower surge tolerance. | Lacks digital OVP strobing and dual OCP; requires external startup resistor and HV diode. | Choose only if cost sensitivity outweighs EMI certification risk and thermal margin requirements. |
| VIPER27LN | 730 V MOSFET, 12 W max continuous power, no EPT, no 115 kHz option - limited peak power headroom. | Cannot support >20 W peak loads; lacks extra power timer for inrush management in smart home hubs. | Select only for low-power (<15 W), non-surge-critical applications where SDIP10 footprint is not required. |
Compared with ICE3B0565J and VIPER27LN, VIPER38HE offers superior surge resilience (800 V + EPT), lower EMI (jitter + digital OVP), and higher power density (30 W peak in SDIP10), making it optimal for next-generation energy-efficient adapters and industrial power supplies.
Availability
VIPER38HE is available at Aetrix Electronics and suitable for smart energy meters, home appliance auxiliary supplies, and industrial IoT gateways requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for VIPER38HE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.
VIPER38HE belongs to the VIPerPlus family of high-voltage converters designed specifically for compact, low-component-count offline SMPS in energy-efficient auxiliary power supplies and adapters.
FAQ
What is the maximum continuous output power achievable with VIPER38HE in an open-frame design?
VIPER38HE delivers up to 15 W continuous output power at 50 °C ambient in open-frame configurations with adequate heat sinking (≥200 mm² copper pour under DRAIN pins). This rating assumes 230 Vac input, 115 kHz switching, and proper transformer derating to maintain junction temperature below 150 °C under worst-case load and line conditions.
How does the EPT (Extra Power Timer) function interact with the dual OCP protection?
The EPT overrides the first-level OCP (IDlim) for a user-defined duration (2–5 s via external capacitor), allowing temporary 130–150% overload without entering hiccup mode. If overload persists beyond EPT timeout, the second-level OCP (IDMAX = 1.7 A) triggers automatic restart - ensuring transformer and MOSFET remain within safe SOA limits during sustained faults.
Can VIPER38HE operate with a 12 V DC input instead of AC mains?
No - VIPER38HE requires high-voltage DC input (≥60 V) applied to the DRAIN pin to enable its internal HV startup generator. It is not designed for low-voltage DC-DC conversion; attempting 12 V DC will prevent VDD charging and result in no switching activity. Use dedicated DC-DC controllers like L6599AT for such applications.
What is the recommended minimum copper area under the DRAIN pins for thermal performance?
STMicroelectronics specifies ≥200 mm² of 35 μm-thick copper connected directly to pins 13–16 (DRAIN) on the primary-side PCB layer. This achieves RTH-JC = 5 °C/W and allows full 30 W peak power capability. Reducing copper area below 100 mm² increases junction temperature by >25 °C, risking premature thermal shutdown under sustained load.
VIPER38HE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- VIPer™ plus
- Package/Case:
- 10-SDIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 80%
- Frequency - Switching:
- 115kHz
- Power (Watts):
- 20 W
- Fault Protection:
- Current Limiting, Over Temperature, Over Voltage, Short Circuit
- Control Features:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-SDIP
- Mounting Type:
- Through Hole
VIPER38HE FAQ
1.How can I place an order for VIPER38HE through Aetrix?
Please submit a Request for Quotation (RFQ) for VIPER38HE on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for VIPER38HE reliable?
The price and inventory of VIPER38HE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VIPER38HE is usually 5 days.
3.What payment methods are accepted for VIPER38HE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VIPER38HE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VIPER38HE?
VIPER38HE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VIPER38HE order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for VIPER38HE?
For technical support, including VIPER38HE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VIPER38HE requirements.
6.How does Aetrix verify that VIPER38HE is sourced from the original manufacturer or authorized distributors?
All VIPER38HE products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that VIPER38HE meets industry standards.
7.What is the process for return or replacement of VIPER38HE?
All VIPER38HE units undergo pre-shipment inspection (PSI). If there is an issue with VIPER38HE, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The VIPER38HE part is unused and in its original packaging.
Return procedure for VIPER38HE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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