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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > AC DC Converters, Offline Switches

STMicroelectronics VIPER319LDTR

Name: VIPER319LDTR
Brand: STMicroelectronics
SKU: VIPER319LDTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: VIPER319LDTR

Manufacturer:: STMicroelectronics

Category:: AC DC Converters, Offline Switches

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: VIPER319LDTR.pdf

Description:: IC OFFLINE SWITCH MULT TOP 16SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

VIPER319LDTR from STMicroelectronics is a high-voltage offline PWM controller IC integrating an 800 V avalanche-rugged N-channel MOSFET, current-mode control, and embedded HV startup circuitry. It delivers up to 31 W in open-frame designs at 50 °C ambient, supports flyback/buck/buck-boost topologies, and features 990 mA drain current limit, 60 kHz ±7% jittered switching frequency, and 1.2 V internal error amplifier reference.

For engineers reviewing the VIPER319LDTR datasheet, VIPER319LDTR pinout, VIPER319LDTR application, or VIPER319LDTR equivalent, key selection considerations include its 800 V MOSFET breakdown rating, ultra-low no-load consumption (<20 mW @230 VAC), integrated OVP/UVP/OLP/thermal protections with automatic restart, soft-start timing (8 ms typ.), and SO16N package thermal resistance (R_TH-JA = 85 °C/W with 100 mm² copper).

Technical Context

The VIPER319LDTR implements a current-mode PWM architecture with a jittered oscillator (60 kHz ±7%, 200 Hz modulation) to reduce EMI filter size. Its embedded 800 V sense-FET enables lossless primary-side current sensing, while the transconductance error amplifier (G_M = 550 µA/V typ.) references a precision 1.2 V bandgap and drives COMP for loop stability.

Protection logic includes pulse-skip to prevent flux runaway during startup, auto-restart thermal shutdown (T_SD = 160 °C), and separate OVP (4 V threshold, 250 µs debounce) and UVP (0.4 V threshold, 30 ms debounce) pins with configurable intervention. The HV startup current source (ICH2 = 8.8 mA typ.) charges VCC directly from DRAIN, eliminating external bias windings.

Key Specifications

Parameter	Value and Actual Design Meaning
Drain voltage rating	800 V - Enables direct connection to universal AC input (85–265 VAC) without derating or snubber oversizing.
Drain current limit	990 mA @ 25°C - Sets peak primary current for 31 W output in open-frame design at 50°C ambient.
Switching frequency	60 kHz ±7% - Jittered operation spreads spectral energy to pass conducted EMI tests with smaller input filters.
VCC operating range	4.5 V to 30 V - Supports auxiliary winding or output-derived bias; clamp activates above 30.5 V to prevent damage.
Error amp reference	1.2 V ±25 mV - Provides stable feedback reference for primary-side regulation without optocoupler in non-isolated topologies.
No-load consumption	<20 mW @ 230 VAC - Meets stringent EU CoC Tier 2 and DOE Level VI standby power requirements.
Soft-start time	8 ms typ. - Gradually ramps current limit to suppress inrush stress on transformer, diode, and output capacitor.
Thermal resistance	R_TH-JA = 85 °C/W (with 100 mm² Cu) - Enables 1 W continuous dissipation at ≤50°C ambient without heatsink in SO16N package.

Pinout & Package

Package: SO16N (16-pin small outline, exposed pad for thermal enhancement). Pin 13–16 are internally connected to MOSFET drain and share mechanical thermal path to PCB copper.

Pin/Terminal	Circuit Role	Design Meaning
1 GND	Power ground & MOSFET source	Common return for bias currents and MOSFET source; must be isolated from pulsed return paths to avoid noise coupling.
3 VCC	Controller supply rail	Charged by HV startup current; requires ≥10 µF storage cap + 0.1 µF ceramic bypass; UVLO triggers at 4.0 V.
5 UVP	Undervoltage disable input	0.4 V threshold; 30 ms debounce; disables IC with <0.35 mA quiescent draw - usable as remote ON/OFF control.
6 OVP	Overvoltage protection input	4 V threshold; 250 µs debounce; disables PWM and auto-restarts after 500 ms - configurable for input or output overvoltage.
7 FB	Inverting error amp input	1.2 V reference point; accepts direct feedback in buck/non-isolated designs; grounding disables E/A.
8 COMP	Error amp output	Drives current limit setpoint; compensation network between COMP and GND sets loop stability; optocoupler-driven in isolated flyback.
13–16 DRAIN	MOSFET drain terminals	Parallel-connected high-voltage drain nodes; require large copper pour for thermal relief (R_TH-JC = 5 °C/W with 100 mm² Cu).

Key Features

Feature	Design Value
Integrated 800 V avalanche-rugged MOSFET	Eliminates external HV switch and reduces BOM count; withstands repetitive avalanche energy (3 mJ) without degradation.
Jittered 60 kHz oscillator	±7% frequency spread at 200 Hz lowers peak EMI amplitude by ~10 dB, enabling smaller Y-cap and common-mode choke.
Embedded HV startup current source	8.8 mA typ. charging current eliminates need for auxiliary winding or startup resistor network in most low-power adapters.
Separate OVP and UVP pins	Configurable thresholds (4 V / 0.4 V) and independent debounce timers allow precise input monitoring or system-level enable/disable control.
Pulse-skip protection	Prevents flux runaway during light-load or startup by skipping cycles when t_ON-MIN (300 ns) is exceeded - avoids saturation-induced transformer failure.

Applications

Smart Home Power Supply

Industrial Sensor Node PSU

Use Scenario: Compact 12 V/0.5 A offline adapter powering Zigbee/Z-Wave gateways inside wall-mounted enclosures with no forced airflow.

IC Role / Device Role / Timing Role: Primary-side regulated flyback controller with integrated MOSFET; handles 85–265 VAC input and delivers regulated output without optocoupler.

Use Value: Achieves <20 mW no-load consumption and 82% efficiency at full load - meets Energy Star v3.0 and meets IEC 62368-1 creepage requirements using SO16N package.

Use Scenario: DIN-rail mounted 5 V/1 A power module supplying RS-485 sensors and microcontrollers in factory automation cabinets.

IC Role / Device Role / Timing Role: Buck-derived offline regulator delivering tightly regulated output across wide input transients (e.g., 110–277 VAC line surges).

Use Value: 800 V MOSFET withstands 2.5 kV surge per IEC 61000-4-5; UVP pin used as remote disable during maintenance; thermal shutdown prevents field failure at 70°C ambient.

LED Driver for Smart Bulbs

White Goods Auxiliary PSU

Use Scenario: Dimmable 9 W constant-voltage LED driver embedded in E27 screw-base smart bulbs with TRIAC dimmer compatibility.

IC Role / Device Role / Timing Role: Buck-boost topology controller regulating output despite deep phase-cut AC waveform distortion.

Use Value: Jittered 60 kHz switching avoids audible noise in filament-free bulbs; 990 mA current limit enables single-stage design without secondary-side current sense.

Use Scenario: 3.3 V/0.3 A auxiliary supply for MCU and display in washing machine control board, operating continuously during 3-hour cycles.

IC Role / Device Role / Timing Role: Flyback controller with OVP tied to main DC bus to shut down during PFC overvoltage events.

Use Value: Integrated OVP (4 V threshold) responds within 250 µs to protect downstream logic; soft-start prevents inrush into bulk capacitors during repeated door-open cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage offline SMPS controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ICE3B0565J	650 V MOSFET, fixed 65 kHz frequency, no jitter, higher VCC min (10.5 V)	Lacks 800 V rating for universal AC input without derating; requires external startup resistor	Choose only if input is limited to ≤230 VAC and EMI filter size is not constrained.
LNK3206D	725 V MOSFET, 132 kHz, no UVP/OVP pins, uses frequency folding for light-load efficiency	No dedicated protection pins - OVP/UVP must be implemented externally; lower max power (17 W open-frame)	Select when ultra-low BOM count is critical and protection functions can be added discretely.

Compared with ICE3B0565J and LNK3206D, VIPER319LDTR provides superior input voltage margin (800 V vs. 650/725 V), built-in jitter for EMI reduction, and dedicated UVP/OVP pins enabling simpler, more robust protection schemes - making it optimal for cost-sensitive, globally rated 20–30 W adapters requiring minimal external components.

Availability

VIPER319LDTR is available at Aetrix Electronics and suitable for smart home power supplies, industrial sensor node PSUs, LED drivers for smart bulbs, and white goods auxiliary PSUs requiring stable component supply across global markets and multi-year production cycles.

Supply support for VIPER319LDTR 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.

VIPER31 belongs to ST's high-voltage AC-DC converter product line, engineered specifically for compact, low-component-count offline SMPS in sub-35 W applications where reliability, energy efficiency, and EMI compliance are critical.

FAQ

What is the maximum continuous output power achievable with VIPER319LDTR in a vented enclosure?

VIPER319LDTR delivers up to 31 W in open-frame designs at 50 °C ambient temperature with adequate PCB copper area (100 mm²). This assumes proper thermal layout - including soldering pins 13–16 to large copper pours - and operation within the 60 kHz (L-type) frequency variant. Power drops to 19 W in enclosed, non-ventilated adapters due to thermal limitations.

Can VIPER319LDTR operate without an auxiliary winding for VCC supply?

Yes. Its integrated HV startup current source (8.8 mA typ.) charges the VCC capacitor directly from the DRAIN pin during startup, eliminating the need for an auxiliary winding in most designs. Once running, VCC may be sustained by an auxiliary winding or - in non-isolated topologies - directly from the regulated output if ≥5 V.

How does the pulse-skip function prevent flux runaway during startup?

Pulse-skip monitors whether the DRAIN current exceeds the 990 mA limit within the minimum on-time (300 ns). If so, the next cycle is skipped - preventing cumulative core saturation when the off-time is insufficient to reset flux. This avoids transformer overheating and catastrophic failure during cold-start or low-output-voltage conditions.

Is the OVP pin intended for input or output overvoltage protection?

OVP is configurable for either role: in isolated flyback designs, it's typically connected to an optocoupler-driven voltage divider on the secondary side for output OVP; in non-isolated buck or buck-boost topologies, it monitors the input DC bus directly. The 4 V threshold and 250 µs response time make it suitable for fast-acting protection in both configurations.

VIPER319LDTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: VIPER™

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Isolation:: Non-Isolated

Internal Switch(s):: Yes

Voltage - Breakdown:: 800V

Topology:: Boost, Buck, Buck-Boost, Flyback

Voltage - Start Up:: 8 V

Voltage - Supply (Vcc/Vdd):: 4.5V ~ 30V

Duty Cycle:: -

Frequency - Switching:: 60kHz

Power (Watts):: 1 W

Fault Protection:: Over Load, Over Temperature, Over Voltage, Short Circuit

Control Features:: Soft Start

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Supplier Device Package:: 16-SO

Mounting Type:: Surface Mount

VIPER319LDTR FAQ

1.How can I place an order for VIPER319LDTR through Aetrix?

Please submit a Request for Quotation (RFQ) for VIPER319LDTR 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 VIPER319LDTR reliable?

The price and inventory of VIPER319LDTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VIPER319LDTR is usually 5 days.

3.What payment methods are accepted for VIPER319LDTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VIPER319LDTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for VIPER319LDTR?

VIPER319LDTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your VIPER319LDTR 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 VIPER319LDTR?

For technical support, including VIPER319LDTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VIPER319LDTR requirements.

6.How does Aetrix verify that VIPER319LDTR is sourced from the original manufacturer or authorized distributors?

All VIPER319LDTR 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 VIPER319LDTR meets industry standards.

7.What is the process for return or replacement of VIPER319LDTR?

All VIPER319LDTR units undergo pre-shipment inspection (PSI). If there is an issue with VIPER319LDTR, 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 VIPER319LDTR part is unused and in its original packaging.

Return procedure for VIPER319LDTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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