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VIPER38LD
STMicroelectronics
IC OFFLINE SWITCH FLYBACK 16SO
1399 Pcs New Original In Stock
Converter Offline Flyback Topology 60kHz 16-SO
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5.0 / 5.0
- (115 Ratings)
VIPER38LD
Product Overview
8152465
DiGi Electronics Part Number
VIPER38LD-DGManufacturer
STMicroelectronics
VIPER38LD
Description
IC OFFLINE SWITCH FLYBACK 16SOInventory
1399 Pcs New Original In Stock
Converter Offline Flyback Topology 60kHz 16-SO
Quantity
Minimum 1
Minimum 1
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VIPER38LD Technical Specifications
Category
Power Management (PMIC), AC DC Converters, Offline Switches
Packaging
Tube
Series
VIPer™ plus
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
60kHz
Power (Watts)
20 W
Fault Protection
Current Limiting, Over Temperature, Over Voltage, Short Circuit
Control Features
-
Operating Temperature
-40°C ~ 150°C (TJ)
Package / Case
16-SOIC (0.154", 3.90mm Width)
Supplier Device Package
16-SO
Mounting Type
Surface Mount
Base Product Number
VIPER38
Datasheet & Documents
HTML Datasheet
VIPER38LD-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
497-16079-5
Standard Package
50
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
Their logistics tracking and support create a seamless shopping experience.
December 02, 2025
Customer support at DiGi Electronics consistently exceeds my expectations with their friendliness.
December 02, 2025
The products have consistent electrical performance, which is crucial for sensitive measurements.
December 02, 2025
Received my order faster than I expected with excellent packaging security.
December 02, 2025
Received my package swiftly, and the packaging was flawless and secure.
December 02, 2025
The comprehensive packaging protected the product from moisture and shocks during transit.
December 02, 2025
Post-sale support went above and beyond to ensure my satisfaction after the purchase.
December 02, 2025
Customer support at DiGi Electronics is prompt, friendly, and effective.
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Frequently Asked Questions (FAQ)
What are the key design risks when replacing a VIPER38LD with a competing offline flyback controller like the Power Integrations TNY280GN in a 15W isolated power supply?
Replacing the VIPER38LD with the TNY280GN introduces several engineering risks: the TNY280GN uses a different switching frequency (132 kHz vs. 60 kHz), which can affect transformer size, EMI filtering requirements, and core losses. Additionally, the TNY280GN integrates a lower-voltage MOSFET (700V breakdown vs. 800V on the VIPER38LD), reducing margin in high-line or surge conditions. The control schemes also differ—the VIPER38LD supports primary-side regulation with better line/load regulation, while the TNY280GN relies on simpler ON/OFF control, potentially degrading output accuracy. Always re-validate efficiency, thermal performance, and conducted EMI compliance when substituting, especially in universal input (85–265VAC) applications.
How does the VIPER38LD’s 800V breakdown voltage influence transformer design and system reliability in high-line industrial environments?
The VIPER38LD’s 800V internal MOSFET provides critical headroom for high-line (up to 265VAC) and transient surge conditions (e.g., IEC 61000-4-5), reducing stress on the primary-side switch. This allows designers to use smaller, lower-cost transformers without derating excessively for voltage spikes. However, the 60kHz switching frequency means core selection must balance between ferrite materials (e.g., 3C90 or PC40) that minimize losses at this frequency while maintaining thermal stability. Avoid pushing the duty cycle beyond 75% in practice—even though the spec allows 80%—to prevent flux walking and ensure reliable operation under load transients. This voltage margin directly enhances long-term reliability in harsh industrial or outdoor power supplies.
Can the VIPER38LD be safely used in a non-isolated buck configuration for cost-sensitive LED drivers, and what are the hidden pitfalls?
While technically possible, using the VIPER38LD in a non-isolated buck topology is not recommended due to fundamental safety and performance issues. The VIPER38LD is designed for isolated flyback operation with built-in protections (e.g., over-voltage, short-circuit) that assume galvanic isolation. Removing isolation compromises safety certification (e.g., UL, IEC 61347) and exposes downstream circuitry to mains potential. Additionally, the feedback mechanism relies on optocoupler or auxiliary winding—both absent in non-isolated bucks—leading to poor regulation and potential instability. For non-isolated LED drivers, consider dedicated buck controllers like the STL600 or Infineon ICL5100 instead to avoid reliability risks and certification failures.
What layout and thermal considerations are critical when designing a PCB with the VIPER38LD in a compact 20W adapter, given its 16-SO package and MSL 3 rating?
The VIPER38LD’s 16-SOIC package demands careful PCB layout to manage thermal dissipation and moisture sensitivity. Use a solid ground plane under the IC with multiple thermal vias to conduct heat to the bottom layer, especially since the exposed pad isn’t available—relying solely on pin conduction. Keep high-di/dt loops (drain, source, input capacitor) as short as possible to minimize EMI and voltage ringing. Due to MSL 3 (168-hour floor life), implement strict moisture control: bake trays before reflow if stored beyond limit, and avoid prolonged exposure in humid environments. In compact adapters, ensure at least 8mm creepage between primary and secondary sides to maintain isolation integrity, even if the package itself is surface-mount only.
How does the VIPER38LD’s startup voltage (14V) and supply range (8.5–23.5V) affect hold-up time and brownout performance in wide-input offline converters?
The VIPER38LD’s 14V startup threshold means the controller won’t begin switching until the Vcc capacitor charges sufficiently, which can delay power-up in low-line conditions. Once running, the wide 8.5–23.5V operating range allows continued operation during brief brownouts, but hold-up time depends heavily on the bulk capacitor size and load current. To improve brownout resilience, size the input capacitor to maintain Vcc above 8.5V during line dips (e.g., 90VAC for 20ms). Avoid relying solely on the internal UVLO—external hysteresis or supervisory circuits may be needed for mission-critical applications. This behavior differs from controllers like the ON Semiconductor NCP1014, which has a lower startup voltage (~10V), making the VIPER38LD less suitable for ultra-low standby designs without auxiliary bias windings.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
VIPER38LD CAD Models
STMicroelectronics VIPER38LD PCB symbols & footprints
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