My Inquiry
My Account
STMicroelectronics VIPER38HDTR
- Part No.:
- VIPER38HDTR
- Manufacturer:
- STMicroelectronics
- Category:
- AC DC Converters, Offline Switches
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
VIPER38HDTR.pdf
- Description:
- IC OFFLINE SWITCH FLYBACK 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,135
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
VIPER38HDTR 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 dual-level overcurrent protection (IDlim = 1.15 A typ, IDMAX = 1.7 A). It operates at 60 kHz (L-type) or 115 kHz (H-type), delivers up to 30 W peak power in open-frame designs, and achieves 30 mW no-load consumption at 230 Vac - enabling compliance with stringent energy-saving standards in auxiliary power supplies.
For engineers reviewing the VIPER38HDTR datasheet, VIPER38HDTR pinout, VIPER38HDTR application, or VIPER38HDTR equivalent, this device is selected for flyback converters requiring ultra-wide input range (85–265 Vac), robust overload handling via Extra Power Timer (EPT), low EMI through jittered oscillator, and integrated thermal shutdown with 30 °C hysteresis.
Technical Context
The VIPER38HDTR implements a current-mode PWM control architecture with cycle-by-cycle current limiting set via the CONT pin and a secondary OCP threshold (IDMAX = 1.7 A) to prevent transformer saturation or secondary diode short-circuit failure. Its integrated HV startup draws current directly from the DRAIN pin above 80 V, eliminating external startup resistors.
Burst-mode operation below VFBbm (0.6 V typ) reduces no-load consumption to 30 mW, while soft-start (8.5 ms typ) limits inrush stress. The digital noise-filtered overvoltage protection (VOVP = 3.0 V ±0.3 V) and strobe time (2 μs typ) ensure immunity to transient spikes on the feedback path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Drain voltage rating | 800 V min - enables direct connection to universal AC input (85–265 Vac) without pre-regulation |
| Peak output power | 30 W (peak, 2 sec) - supports temporary surge loads in energy metering and adapter applications |
| No-load consumption | 30 mW at 230 Vac - meets EU CoC Tier 2 and DOE Level VI standby efficiency requirements |
| Operating frequency | 60 kHz (VIPER38L) or 115 kHz (VIPER38H) - selectable via part variant; jittered oscillator reduces EMI peaks |
| Current limit thresholds | IDlim = 1.15 A (adjustable via CONT resistor); IDMAX = 1.7 A - dual-stage OCP prevents both winding saturation and catastrophic shorts |
| OVP threshold | 3.0 V ±0.3 V with digital noise filter - ensures stable regulation under noisy feedback conditions |
| Thermal shutdown | 155 °C typical with 30 °C hysteresis - guarantees safe auto-restart after fault removal without manual intervention |
Pinout & Package
The VIPER38HDTR is housed in a SO-16 Narrow (SO16N) package with exposed DRAIN pins (13–16) for enhanced thermal dissipation. Copper area under DRAIN pins is mandatory per datasheet layout guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 GND | Device ground & MOSFET source | Common reference for control logic and power return; must be low-inductance connection |
| 3 N.C. | Not connected | No internal connection; leave unconnected or tie to GND for mechanical stability |
| 4 N.A. | Controller die pad | Mechanically tied to frame; connect to GND to improve noise immunity |
| 5 VDD | Control section supply | Charged by HV startup current from DRAIN; clamped at 23.5 V for overvoltage safety |
| 6 CONT | Current limit / OVP select | Adjusts IDlim threshold or enables digital OVP monitoring; clamp voltages: 0.5 V (low), 5.5 V (high) |
| 7 FB | Feedback input | Sets duty cycle; triggers burst mode at 0.6 V, overload detection at 3.5 V, OVP shutdown at 4.8 V |
| 8 EPT | Extra Power Timer | Connects external capacitor to sustain overload for seconds; restarts after VEPT drops below 0.6 V |
| 9–12 N.C. | Not connected | No internal function; avoid routing signals or traces |
| 13–16 DRAIN | High-voltage MOSFET drain | Carries full primary-side switching current; also supplies HV startup bias current |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 800 V avalanche-rugged MOSFET | Eliminates need for external HV switch and gate driver; withstands repetitive avalanche energy up to 5 mJ |
| Embedded HV startup generator | Draws current directly from DRAIN pin above 80 V - removes startup resistor, reducing BOM count and heat generation |
| Dual-level overcurrent protection | IDlim (1.15 A) for normal cycle-by-cycle limiting; IDMAX (1.7 A) for fast shutdown during transformer saturation or secondary short |
| Jittered oscillator | ±4 kHz (L-type) or ±8 kHz (H-type) modulation depth - spreads EMI spectrum to ease EMC compliance |
| Extra Power Timer (EPT) | External capacitor sets overload hold time (seconds); enables brief peak-power delivery without false tripping |
| Digital noise-filtered OVP | 2 μs strobe window rejects <1.5 μs transients - prevents nuisance shutdown during line surges or switching noise |
Applications
| Energy Meter Auxiliary Supply | Smart Home Adapter |
|---|---|
|
Use Scenario: Provides isolated 5 V/12 V bias for metrology ICs, RTC, and communication modules in DIN-rail energy meters operating across 85–265 Vac. IC Role / Device Role / Timing Role: Primary-side flyback controller with integrated HV MOSFET; manages burst-mode light-load operation and thermal-safe auto-restart after grid transients. Use Value: 30 mW no-load consumption extends battery backup runtime; 800 V drain rating eliminates input pre-regulator stage. |
Use Scenario: Powers Wi-Fi/BLE modules and sensors in compact wall-plug adapters for smart lighting and HVAC controls. IC Role / Device Role / Timing Role: High-frequency (115 kHz) flyback controller enabling smaller transformers and reduced EMI filtering; EPT sustains 20% overload for firmware updates. Use Value: Jittered oscillator meets CISPR-32 Class B radiated emissions; SO16N package allows ≤12 mm board height. |
| Industrial Data Concentrator PSU | White Goods Auxiliary Converter |
|
Use Scenario: Supplies 3.3 V/5 V to ARM-based concentrators aggregating data from multiple smart meters in utility substations. IC Role / Device Role / Timing Role: Robust primary-side controller with dual OCP and thermal hysteresis; handles wide ambient (-40 to +85 °C) and long-term reliability demands. Use Value: 150 °C thermal shutdown with 30 °C hysteresis prevents latch-up during sustained overloads; RDS(on) = 4.5 Ω minimizes conduction loss at 50 °C ambient. |
Use Scenario: Generates isolated 12 V for display, touch panel, and motor control logic in refrigerators and washing machines. IC Role / Device Role / Timing Role: Integrated HV start-up and soft-start (8.5 ms) reduce inrush stress on bulk capacitor and relay contacts during cold start. Use Value: 30 mW no-load draw cuts standby power below 0.5 W; 800 V drain withstands 1.2 kV surge tests per IEC 61000-4-5. |
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 drain rating; external startup resistor required; no EPT or digital OVP filter | Lacks sustained overload capability and noise-immune OVP - unsuitable for high-transient industrial environments | Prefer VIPER38HDTR where universal AC input, EMI reduction, and robust fault recovery are critical |
| LNK364PG | 725 V drain; integrated startup but no adjustable OCP; fixed 66 kHz frequency; no EPT | Lower peak power (15 W) and no programmable extra-power timing - insufficient for 25+ W metering systems | Choose VIPER38HDTR when >20 W continuous output, dual OCP, or EPT-managed overload is required |
Compared with ICE3B0565J and LNK364PG, the VIPER38HDTR uniquely combines 800 V ruggedness, dual OCP thresholds, EPT-based overload tolerance, and digitally filtered OVP - making it the only option among the three capable of sustaining 30 W peak loads while meeting strict EMI and energy-efficiency mandates.
Availability
VIPER38HDTR is available at Aetrix Electronics and suitable for energy meter auxiliary supplies, smart home adapters, and industrial data concentrator power supplies requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for VIPER38HDTR 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, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The VIPER38HDTR belongs to the VIPerPlus family of high-voltage offline controllers, engineered specifically for cost-sensitive, space-constrained auxiliary power supplies demanding ultra-wide input range, low standby power, and integrated protection.
FAQ
What is the maximum continuous output power achievable with VIPER38HDTR in an open-frame design?
The VIPER38HDTR delivers up to 15 W continuous output power in open-frame configurations at 50 °C ambient temperature with adequate heatsinking. This rating assumes SO16N package mounted on a standard FR4 PCB with ≥100 mm² copper pour under DRAIN pins to maintain junction temperature below 125 °C under full load.
How does the Extra Power Timer (EPT) function affect system behavior during overload?
When an overload condition exceeds IDlim, the EPT circuit holds the IC in active switching for a user-defined duration (set by external capacitor on EPT pin), allowing brief peak power delivery (e.g., 30 W for 2 sec). After timeout, the IC enters hiccup mode until VEPT falls below 0.6 V, then automatically restarts - preventing thermal runaway while supporting real-world surge events.
Can VIPER38HDTR operate without an external feedback optocoupler?
No. The VIPER38HDTR requires an optocoupler-based feedback loop connected to the FB pin to regulate output voltage. Its internal current generator (−200 µA typ) sinks current from the optocoupler LED cathode; regulation accuracy depends on external TL431 or shunt regulator configuration per Figure 16 in DS10100 Rev 3.
What is the minimum recommended copper area under DRAIN pins for thermal performance?
STMicroelectronics specifies ≥100 mm² of 35 µm-thick copper connected directly to pins 13–16 (DRAIN) on the primary-side PCB layer. This reduces RTH-JA from 120 °C/W to 85 °C/W (SO16N), enabling 15 W continuous operation at 50 °C ambient. Smaller copper areas risk exceeding TJ = 150 °C during sustained load.
VIPER38HDTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- VIPer™ plus
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 16-SO
- Mounting Type:
- Surface Mount
VIPER38HDTR FAQ
1.How can I place an order for VIPER38HDTR through Aetrix?
Please submit a Request for Quotation (RFQ) for VIPER38HDTR 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 VIPER38HDTR reliable?
The price and inventory of VIPER38HDTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VIPER38HDTR is usually 5 days.
3.What payment methods are accepted for VIPER38HDTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VIPER38HDTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VIPER38HDTR?
VIPER38HDTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VIPER38HDTR 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 VIPER38HDTR?
For technical support, including VIPER38HDTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VIPER38HDTR requirements.
6.How does Aetrix verify that VIPER38HDTR is sourced from the original manufacturer or authorized distributors?
All VIPER38HDTR 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 VIPER38HDTR meets industry standards.
7.What is the process for return or replacement of VIPER38HDTR?
All VIPER38HDTR units undergo pre-shipment inspection (PSI). If there is an issue with VIPER38HDTR, 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 VIPER38HDTR part is unused and in its original packaging.
Return procedure for VIPER38HDTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VIPER38HDTR Tags
-
LNK6407D-TL
Power Integrations
-
LNK3204D-TL
Power Integrations
-
SR10LG-G
Microchip Technology
-
TNY285DG-TL
Power Integrations
-
LNK304DN-TL
Power Integrations
-
TNY285KG-TL
Power Integrations
-
LNK3206D-TL
Power Integrations
-
LNK623DG-TL
Power Integrations
-
TNY286PG
Power Integrations
-
LNK624DG-TL
Power Integrations
-
LNK604DG-TL
Power Integrations
-
UCC28704DBVR-1
Texas Instruments
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
