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VIPER222XSTR
STMicroelectronics
IC OFFLINE SWITCH FLYBACK 10SSOP
1528 Pcs New Original In Stock
Converter Offline Flyback Topology 30kHz 10-SSOP
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5.0 / 5.0
- (201 Ratings)
VIPER222XSTR
Product Overview
917624
DiGi Electronics Part Number
VIPER222XSTR-DGManufacturer
STMicroelectronics
VIPER222XSTR
Description
IC OFFLINE SWITCH FLYBACK 10SSOPInventory
1528 Pcs New Original In Stock
Converter Offline Flyback Topology 30kHz 10-SSOP
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
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VIPER222XSTR Technical Specifications
Category
Power Management (PMIC), AC DC Converters, Offline Switches
Packaging
Tape & Reel (TR)
Series
VIPER™
Product Status
Active
Output Isolation
Isolated
Internal Switch(s)
Yes
Voltage - Breakdown
730V
Topology
Flyback
Voltage - Start Up
30 V
Voltage - Supply (Vcc/Vdd)
4.5V ~ 30V
Duty Cycle
80%
Frequency - Switching
30kHz
Power (Watts)
13 W
Fault Protection
Current Limiting, Over Temperature, Over Voltage
Control Features
-
Operating Temperature
-40°C ~ 150°C (TJ)
Package / Case
10-SOP (0.154", 3.90mm Width)
Supplier Device Package
10-SSOP
Mounting Type
Surface Mount
Base Product Number
VIPER222
Datasheet & Documents
HTML Datasheet
VIPER222XSTR-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-VIPER222XSTR
497-VIPER222XSCT
497-VIPER222XSDKR
Standard Package
2,500
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
在迪吉電子購買真的很划算，價格優惠，配送迅速，而且服務很好。
December 02, 2025
I am impressed by their prompt and courteous after-sales assistance.
December 02, 2025
I was amazed by how quickly my package was dispatched and delivered.
December 02, 2025
The support team promptly addressed my concerns about performance and provided practical improvement suggestions.
December 02, 2025
Their affordability does not come at the cost of quality.
December 02, 2025
With competitive prices, DiGi Electronics makes premium electronics within reach.
December 02, 2025
They provide excellent value with their low prices and attentive support.
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Frequently Asked Questions (FAQ)
Can the VIPER222XSTR safely replace a Power Integrations TNY280GN in a 12W offline flyback design without major circuit changes?
The VIPER222XSTR can potentially replace the TNY280GN in low-power flyback applications up to 13W, but careful evaluation is required. While both integrate a high-voltage MOSFET and controller, the VIPER222XSTR operates at 30kHz fixed frequency versus the TNY280GN’s variable frequency up to 132kHz, which affects transformer size and EMI profile. The VIPER222XSTR also lacks the TNY280GN’s auto-restart cycle for fault recovery, relying instead on latched over-temperature and over-voltage protection. You’ll need to verify startup behavior (30V vs. ~50V for TinySwitch), ensure adequate Vcc regulation (4.5–30V range), and possibly redesign the feedback loop due to differing control schemes. Thermal performance under full load should be validated, especially given the 10-SSOP package’s limited heatsinking.
What are the key reliability risks when using the VIPER222XSTR in high-ambient-temperature environments like industrial enclosures?
The VIPER222XSTR’s junction temperature range (-40°C to 150°C) is robust, but sustained operation near 150°C significantly reduces MOSFET lifetime and increases failure risk due to thermal cycling. In sealed industrial enclosures where ambient temperatures exceed 60°C, the 10-SSOP package (with limited thermal dissipation) may struggle to maintain safe junction temperatures—especially at full 13W output. Without a copper pour or thermal vias on the PCB, localized heating can trigger premature over-temperature shutdown or degrade internal bond wires. To mitigate this, implement a conservative derating curve (e.g., limit output to 8–10W above 50°C ambient), use a thermal pad with exposed die attach, and consider external snubber networks to reduce switching stress and conduction losses.
How does the VIPER222XSTR’s 30kHz fixed switching frequency impact EMI compliance and transformer selection compared to higher-frequency alternatives?
The VIPER222XSTR’s 30kHz fixed frequency simplifies transformer design but poses challenges for EMI compliance and miniaturization. Lower frequency increases conducted EMI in the 150kHz–30MHz band, requiring larger input filters and more aggressive shielding to meet CISPR 32 Class B limits. Additionally, the core size must be larger than in high-frequency designs (e.g., >100kHz), increasing BOM cost and PCB footprint. When selecting a transformer, ensure it supports continuous conduction mode (CCM) at light loads and verify saturation current margins under peak load. Ferrite materials like 3C90 or equivalent are recommended. Unlike frequency-jittered or quasi-resonant controllers, the fixed 30kHz operation generates tonal noise that may interfere with sensitive analog circuits—consider spread-spectrum techniques externally if needed.
Is it safe to operate the VIPER222XSTR with a 24V auxiliary supply instead of deriving Vcc from the input bulk capacitor?
Yes, the VIPER222XSTR supports external Vcc supply (4.5V to 30V), making it suitable for designs using a 24V auxiliary rail—common in industrial or PoE-powered systems. This approach improves startup reliability and reduces stress on the internal high-voltage startup circuit. However, ensure the 24V source is stable and includes transient protection (e.g., TVS diode), as voltage spikes above 30V can damage the IC. Also, disable the internal startup FET by connecting Vcc directly to the auxiliary supply after initial power-up to avoid unnecessary power loss. Note that fault protections (over-voltage, over-temperature) remain active, but the device will not auto-restart if Vcc drops below UVLO; implement an external supervisor if brownout resilience is critical.
What design considerations are critical when using the VIPER222XSTR in a medical-grade isolated power supply requiring reinforced insulation?
When designing a medical-grade isolated supply with the VIPER222XSTR, focus on maintaining reinforced insulation per IEC 60601-1. The IC itself provides functional isolation, but system-level isolation depends on transformer design, creepage/clearance (≥8mm primary-to-secondary), and optocoupler selection (e.g., PC817X with 5000Vrms rating). The 10-SSOP package has limited pin spacing (3.90mm width), so ensure PCB layout respects safety distances—use slots or insulating barriers if necessary. Additionally, the VIPER222XSTR’s lack of built-in soft-start may cause inrush current during startup; add a soft-start circuit using an external RC network on the feedback pin to reduce stress on the isolation barrier. Validate isolation integrity through hipot testing (3000VAC for 60s) and consider redundancy in fault detection due to the device’s latched protection behavior, which may not meet fail-safe requirements in critical medical applications.
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.
VIPER222XSTR CAD Models
STMicroelectronics VIPER222XSTR PCB symbols & footprints
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