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VIPER37LD
STMicroelectronics
IC OFFLINE SWITCH FLYBACK 16SO
1296 Pcs New Original In Stock
Converter Offline Flyback Topology 60kHz 16-SO
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Minimum 1
5.0 / 5.0
- (148 Ratings)
VIPER37LD
Product Overview
8164961
DiGi Electronics Part Number
VIPER37LD-DGManufacturer
STMicroelectronics
VIPER37LD
Description
IC OFFLINE SWITCH FLYBACK 16SOInventory
1296 Pcs New Original In Stock
Converter Offline Flyback Topology 60kHz 16-SO
Quantity
Minimum 1
Minimum 1
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VIPER37LD 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
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
VIPER37
Datasheet & Documents
HTML Datasheet
VIPER37LD-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
497-16077-5
-497-16077-5
Standard Package
50
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
Their attention to detail in packaging reflects their high standards.
December 02, 2025
I always feel confident buying from DiGi Electronics because of their consistent product quality.
December 02, 2025
Excellent customer service combined with affordable prices makes DiGi Electronics my go-to store.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the VIPER37LD in a high-temperature industrial environment, and how can thermal shutdown reliability be ensured?
When designing the VIPER37LD into industrial applications where ambient temperatures approach 85°C or higher, a primary risk is inadvertently exceeding the 150°C junction temperature limit despite its built-in over temperature protection. To ensure reliable operation, designers must carefully optimize PCB copper pour for thermal dissipation, especially on the drain pad and VSS connections. Use at least 2oz copper with multiple vias to inner ground planes. Avoid placing heat-generating components nearby, and consider derating maximum output power above 100°C ambient. Monitor TJ during load transients using thermal simulation or IR imaging. The VIPER37LD integrates thermal shutdown with auto-restart, but frequent triggering can reduce system reliability—design to avoid sustained activation.
How does the VIPER37LD compare to the VIPER27LD in terms of power delivery and fault protection for a 15W isolated flyback design?
The VIPER37LD supports up to 20W output with an 800V built-in MOSFET, making it suitable for higher-power or wider-line-range designs compared to the VIPER27LD, which is typically limited to 13–15W. Both include current limiting, over temperature, and over voltage protection, but the VIPER37LD offers a higher 80% duty cycle and better thermal performance, allowing greater design margin. If upgrading from VIPER27LD to VIPER37LD, ensure the control loop compensation and transformer design are reviewed—the higher current capability can lead to increased core losses if not adjusted. The pin compatibility simplifies migration, but always verify startup behavior under low-line conditions due to differences in internal current sense thresholds.
What layout best practices should be followed to minimize EMI when integrating the VIPER37LD in a compact power supply?
To control EMI with the VIPER37LD, minimize high dV/dt node areas—especially the DRAIN pin and transformer primary connection. Use a compact, low-loop-area layout for the primary-side high-current path: keep the input bulk capacitor close to the DRAIN and VSS pins. Route sensitive feedback and CS signal lines away from switching nodes and use a guard ring if necessary. Exploit the 16-SO package’s natural isolation between primary and secondary sides by splitting ground planes appropriately. Keep the bootstrap resistor (from HV to VDD) as short as possible and add a small RC snubber across the transformer primary if radiated emissions exceed limits. The fixed 60kHz switching frequency of the VIPER37LD simplifies EMI filter design compared to frequency-jittered alternatives, but predictable peaks require targeted filtering.
Can the VIPER37LD be used in a universal input (85–265VAC) application without external startup circuitry, and what are the startup time implications?
Yes, the VIPER37LD can directly start from rectified universal AC input using its internal 800V startup current generator, eliminating the need for an external startup resistor network in most cases. However, startup time may extend to several hundred milliseconds at low line (85VAC) due to the internal HV current source's low current (typically ~30μA). This is acceptable for most consumer or industrial systems, but if fast power-good signaling is required, consider augmenting with an external start-up circuit. Ensure the VDD capacitor is adequately sized (typically 10μF–22μF, low-ESR) and placed close to the VDD and VSS pins to avoid false UVLO triggers during startup loading.
What are the main reliability concerns when replacing a discrete flyback controller + MOSFET with the VIPER37LD, and how does integration affect long-term field performance?
Replacing a discrete controller and MOSFET with the integrated VIPER37LD improves reliability by reducing component count, minimizing solder joint failures, and ensuring precise thermal coupling between control and power sections. However, the monolithic integration means the entire IC must handle both control logic and power switching stress. Ensure the layout avoids thermal bottlenecks and confirm that in-rush or overload conditions don’t repeatedly trigger the internal current limiting, which can accelerate wear-out. Unlike discrete solutions, you cannot upgrade the MOSFET independently, so verify worst-case SOA (safe operating area) with real-world line transients. The VIPER37LD’s 800V breakdown provides margin for voltage spikes in poorly regulated grids, enhancing field reliability over lower-voltage discrete FETs.
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.
VIPER37LD CAD Models
STMicroelectronics VIPER37LD PCB symbols & footprints
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