VIPER319LDTR Equivalent & Substitute Parts

Part Overview

The VIPER319LDTR is an offline switch integrated circuit manufactured by STMicroelectronics, classified as a Power Management PMIC. This device functions as a converter supporting multiple topologies including Boost, Buck, Buck-Boost, and Flyback configurations with a switching frequency of 60kHz. The component operates at 800V breakdown voltage with an internal switch and comprehensive fault protection including overload, over-temperature, over-voltage, and short-circuit protection.

The VIPER319LDTR maintains Active product status with 1028 units currently in stock. Equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity for applications requiring offline switching power conversion.

Substiute Parts

VIPER319LDTR

STMicroelectronicsIn Stock: 1047VIPER319LDTR Datasheet

Current PartRFQ

VIPER317LDTR

STMicroelectronicsIn Stock: 3178VIPER317LDTR Datasheet

Parametric EquivalentRFQ

VIPER318XDTR

STMicroelectronicsIn Stock: 6067VIPER318XDTR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the VIPER319LDTR are identified based on electrical and mechanical parameter compatibility within the VIPER™ series. The substitution logic is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Voltage - Breakdown: 800V (all substitutes match)
• Voltage - Supply (Vcc/Vdd): 4.5V ~ 30V (all substitutes match)
• Voltage - Start Up: 8V (all substitutes match)
• Topology: Boost, Buck, Buck-Boost, Flyback (all substitutes match)
• Power (Watts): 1W (all substitutes match)
• Fault Protection: Over Load, Over Temperature, Over Voltage, Short Circuit (all substitutes match)
• Control Features: Soft Start (all substitutes match)
• Operating Temperature: -40°C ~ 150°C (TJ) (all substitutes match)
• Output Isolation: Non-Isolated (all substitutes match)
• Internal Switch(s): Yes (all substitutes match)

Mechanical Compatibility Criteria:

• Package / Case: 16-SOIC (0.154", 3.90mm Width) (all substitutes match)
• Mounting Type: Surface Mount (all substitutes match)
• Packaging: Tape & Reel (TR) (all substitutes match)

Regulatory & Compliance Criteria:

• RoHS Status: ROHS3 Compliant (all substitutes match)
• Moisture Sensitivity Level (MSL): 3 (168 Hours) (all substitutes match)
• REACH Status: REACH Unaffected (all substitutes match)

Variable Parameter:

• Frequency - Switching: The VIPER319LDTR operates at 60kHz. The VIPER317LDTR maintains 60kHz operation, while the VIPER318XDTR operates at 30kHz. This frequency difference represents the primary technical distinction among substitutes.

Parameter Comparison

Engineering Selection Recommendations

VIPER317LDTR as Primary Substitute: The VIPER317LDTR is a direct parametric equivalent to the VIPER319LDTR. All electrical specifications, mechanical dimensions, and regulatory compliance parameters are identical. The switching frequency remains at 60kHz, matching the primary part. This substitute is suitable for direct replacement in applications where the VIPER319LDTR is specified. The VIPER317LDTR maintains Active product status with higher inventory availability (3160 units).

VIPER318XDTR as Alternative Substitute: The VIPER318XDTR operates at 30kHz switching frequency, compared to the 60kHz of the VIPER319LDTR. All other electrical and mechanical parameters remain identical. This substitute is applicable in designs where lower switching frequency is acceptable or beneficial. The VIPER318XDTR maintains Active product status with the highest inventory availability (6033 units).

All substitute parts comply with ROHS3 and REACH requirements, matching the regulatory status of the primary part. All components are manufactured by STMicroelectronics within the VIPER™ series and utilize identical 16-SOIC surface mount packaging.

Frequently Asked Questions (FAQ)

Q: Can the VIPER317LDTR replace the VIPER319LDTR in existing designs? A: Yes. The VIPER317LDTR is a parametric equivalent with identical electrical specifications, switching frequency (60kHz), and mechanical packaging. Direct substitution is supported without design modification.

Q: What is the primary difference between the VIPER319LDTR and VIPER318XDTR? A: The switching frequency differs. The VIPER319LDTR operates at 60kHz while the VIPER318XDTR operates at 30kHz. All other electrical and mechanical parameters are identical. The lower switching frequency of the VIPER318XDTR may affect transformer design, EMI characteristics, and efficiency in specific applications.

Q: Are all substitute parts in the same package? A: Yes. The VIPER319LDTR, VIPER317LDTR, and VIPER318XDTR all use 16-SOIC (0.154", 3.90mm Width) surface mount packaging with Tape & Reel delivery. PCB layout and footprints are identical.

Q: Do the substitute parts meet the same regulatory requirements? A: Yes. All substitute parts are ROHS3 Compliant, REACH Unaffected, and carry identical MSL ratings of 3 (168 Hours). Regulatory compliance is equivalent across all parts.

Q: What topologies are supported by the substitute parts? A: All substitute parts support Boost, Buck, Buck-Boost, and Flyback topologies. Topology flexibility is maintained across the VIPER319LDTR, VIPER317LDTR, and VIPER318XDTR.

Q: Are there inventory differences between the main part and substitutes? A: Yes. Current inventory levels differ: VIPER319LDTR (1028 units), VIPER317LDTR (3160 units), and VIPER318XDTR (6033 units). Higher availability exists for the VIPER318XDTR.

Q: What is the operating temperature range for all parts? A: All parts operate across -40°C to 150°C junction temperature (TJ), supporting industrial and extended temperature applications.

Q: Do all parts include soft start control? A: Yes. Soft start control is included in the VIPER319LDTR, VIPER317LDTR, and VIPER318XDTR, providing inrush current limiting during startup.

Q: What fault protection mechanisms are included? A: All substitute parts include overload, over-temperature, over-voltage, and short-circuit protection, matching the protection features of the VIPER319LDTR.