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VIPER38LDTR
STMicroelectronics
IC OFFLINE SWITCH FLYBACK 16SO
2271 Pcs New Original In Stock
Converter Offline Flyback Topology 60kHz 16-SO
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5.0 / 5.0
- (470 Ratings)
VIPER38LDTR
Product Overview
8145146
DiGi Electronics Part Number
VIPER38LDTR-DGManufacturer
STMicroelectronics
VIPER38LDTR
Description
IC OFFLINE SWITCH FLYBACK 16SOInventory
2271 Pcs New Original In Stock
Converter Offline Flyback Topology 60kHz 16-SO
Quantity
Minimum 1
Minimum 1
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VIPER38LDTR Technical Specifications
Category
Power Management (PMIC), AC DC Converters, Offline Switches
Packaging
Cut Tape (CT) & Digi-Reel®
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
VIPER38LDTR-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-VIPER38LDTR
497-VIPER38LDTRDKR
VIPER38LDTR-DG
497-VIPER38LDTRCT
Standard Package
2,500
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
Preisvorteile in Kombination mit einem freundlichen, schnellen Service – Top zufrieden.
December 02, 2025
Tracking updates arrived promptly, allowing me to plan my schedule around the delivery time accurately.
December 02, 2025
I am impressed by the consistent quality of their products, which perform reliably over time.
December 02, 2025
After-sales service was thorough, ensuring I understood how to use their products effectively.
December 02, 2025
Speedy delivery and robust construction make DiGi Electronics my go-to brand for electronic needs.
December 02, 2025
The quality assurance measures at DiGi Electronics ensure consistent product performance.
December 02, 2025
Absolutely impressed with the durability and reliability of their offerings.
December 02, 2025
The products are designed with great precision, showcasing excellent craftsmanship.
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Frequently Asked Questions (FAQ)
Can the VIPER38LDTR be used as a drop-in replacement for the Power Integrations TNY280GN in a 15W offline flyback design, and what layout or compensation changes are needed?
The VIPER38LDTR is not a direct drop-in replacement for the TNY280GN due to differences in control architecture, switching frequency (60kHz vs. 132kHz), and package thermal characteristics. While both are integrated offline flyback controllers, the VIPER38LDTR uses a current-mode PWM controller with built-in 800V MOSFET, whereas the TNY280GN is a TOPSwitch-based device with different feedback handling. You will likely need to redesign the feedback loop, adjust transformer turns ratio for the lower 60kHz operation, and verify startup behavior since the VIPER38LDTR requires 14V startup voltage versus the TNY280GN’s auto-restart feature. Additionally, the 16-SO package of the VIPER38LDTR has higher thermal resistance than the DIP-8 of the TNY280GN, so PCB copper area under the device must be increased to maintain junction temperature below 150°C under full load.
What are the key reliability risks when using the VIPER38LDTR in high-ambient-temperature environments above 85°C, and how can they be mitigated?
Operating the VIPER38LDTR in ambient temperatures above 85°C increases the risk of thermal shutdown due to its -40°C to 150°C junction temperature limit and MSL 3 moisture sensitivity. Prolonged exposure near thermal limits reduces MOSFET lifespan and may trigger repeated over-temperature protection cycles, leading to output instability. To mitigate this, ensure adequate copper pour on the PCB (minimum 2 in² of 2 oz copper connected to pins 4 and 13), avoid placing heat-generating components nearby, and consider forced airflow if ambient exceeds 70°C. Also, validate thermal performance under worst-case load and line conditions using infrared imaging or thermocouples on the package surface, as the 16-SOIC package has limited natural convection cooling capability.
How does the VIPER38LDTR handle input voltage surges above 400V DC, and is external clamping necessary for compliance with IEC 61000-4-5?
The VIPER38LDTR has an 800V breakdown voltage on its internal MOSFET, which provides margin over typical 300–400V DC bus voltages, but it is not designed to sustain repeated high-energy surges per IEC 61000-4-5 without external protection. For surge immunity (e.g., ±2kV line-to-ground), a properly rated transient voltage suppressor (TVS) diode (such as SMAJ400A) must be placed at the input after the bridge rectifier, along with an NTC thermistor and fuse. Without this, inductive kickback or lightning-induced transients can exceed safe operating area (SOA) limits, causing latent or catastrophic failure. Always include a π-filter (X-cap + common-mode choke + Y-cap) to reduce conducted emissions and protect the VIPER38LDTR from reflected ringing during switching transitions.
What design constraints should be considered when replacing a discrete flyback controller (e.g., UC3843) with the VIPER38LDTR in a multi-output power supply?
Replacing a discrete controller like the UC3843 with the VIPER38LDTR simplifies design but introduces constraints due to its fixed 60kHz frequency and integrated MOSFET. The VIPER38LDTR is optimized for single-output flyback converters up to 20W; for multi-output designs, cross-regulation becomes a critical issue because the absence of post-regulation means auxiliary windings must be tightly coupled to the main output. Additionally, the lack of external frequency adjustment limits optimization for light-load efficiency, and the 80% max duty cycle may restrict low-line startup performance. If your UC3843-based design relied on variable frequency or external slope compensation, you’ll need to re-evaluate transformer design and possibly add linear regulators or DC-DC post-regulators for stable auxiliary rails. Always simulate or prototype cross-load regulation before finalizing the layout.
Is the VIPER38LDTR suitable for battery-powered or low-standby-power applications, and what modifications are needed to achieve <100mW no-load consumption?
The VIPER38LDTR can achieve low standby power but is not inherently optimized for ultra-low consumption like newer valley-switching or burst-mode controllers. Its 8.5V minimum Vcc and continuous 60kHz operation result in higher quiescent losses compared to alternatives such as the STCH02 or ON Semiconductor NCP1361. To reach <100mW no-load consumption, implement a high-resistance startup resistor (≥100kΩ), use a low-IC quiescent current auxiliary supply once running, and optimize the transformer for low magnetizing current. Consider disabling the VIPER38LDTR via an external MOSFET during deep sleep modes if the application allows intermittent operation. For always-on, ultra-low-power designs, evaluate whether the VIPER38LDTR’s trade-offs justify its integration benefits over more modern, efficiency-focused ICs.
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.
VIPER38LDTR CAD Models
STMicroelectronics VIPER38LDTR PCB symbols & footprints
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