VIPER318HDTR Equivalent & Substitute Parts

Part Overview

The VIPER318HDTR is an offline switch IC 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 132kHz. The part is actively produced and maintains robust inventory levels of 4400 pieces in stock.

Substitute parts are identified when design requirements necessitate alternative sourcing due to supply constraints, inventory availability, or equivalent functional performance across specified electrical and mechanical parameters. The VIPER318HDTR has two parametric equivalents within the VIPER™ series that maintain identical or compatible operational characteristics.

Substiute Parts

VIPER318HDTR

STMicroelectronicsIn Stock: 4467VIPER318HDTR Datasheet

Current PartRFQ

VIPER318LDTR

STMicroelectronicsIn Stock: 5130VIPER318LDTR Datasheet

Parametric EquivalentRFQ

VIPER319XDTR

STMicroelectronicsIn Stock: 4615VIPER319XDTR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the VIPER318HDTR is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Voltage breakdown rating of 800V
• Supply voltage range of 4.5V ~ 30V
• Start-up voltage of 8V
• Switching frequency of 132kHz
• Power rating of 1W
• Support for Boost, Buck, Buck-Boost, and Flyback topologies
• Identical fault protection features: Over Load, Over Power, Over Temperature, Over Voltage, Short Circuit
• Soft Start control feature

Mechanical & Packaging Equivalence Criteria:

• 16-SOIC package with 0.154" (3.90mm) width
• Surface mount mounting type
• 16-SO supplier device package

Compliance & Status Criteria:

• Active product status
• ROHS3 compliance
• Moisture Sensitivity Level 3 (168 Hours)
• REACH Unaffected designation

All identified substitute parts maintain 100% equivalence across these parameters, enabling direct functional replacement in circuit designs without modification to PCB layout or electrical schematic connections.

Parameter Comparison

Engineering Selection Recommendations

VIPER318LDTR is a direct parametric equivalent to the VIPER318HDTR. Both parts share identical electrical specifications, package configuration, and compliance certifications. The VIPER318LDTR maintains active product status with higher current inventory availability at 5100 pieces. Selection between these two parts is based solely on supply chain availability and procurement lead times.

VIPER319XDTR is a parametric equivalent within the VIPER™ series, maintaining all critical electrical and mechanical specifications identical to the VIPER318HDTR. The primary distinction is the base product number designation (VIPER319 versus VIPER318), which reflects internal STMicroelectronics product line segmentation. The VIPER319XDTR is actively produced with inventory of 4529 pieces. This part functions as a complete substitute where VIPER318HDTR availability is constrained.

All three parts maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory compatibility across global markets. Moisture sensitivity level 3 (168 hours) applies uniformly across all variants, requiring identical handling and storage protocols during manufacturing and assembly operations.

Frequently Asked Questions (FAQ)

Q: Can VIPER318LDTR be used as a direct replacement for VIPER318HDTR in existing designs?

A: Yes. The VIPER318LDTR maintains 100% electrical and mechanical equivalence to the VIPER318HDTR across all specified parameters. No circuit modifications, PCB layout changes, or firmware updates are required. The parts are pin-compatible and functionally interchangeable.

Q: What is the difference between VIPER318HDTR and VIPER319XDTR?

A: Both parts are parametric equivalents with identical electrical specifications, switching frequency, voltage ratings, topology support, and package configuration. The base product number differs (VIPER318 versus VIPER319), reflecting internal product line organization by STMicroelectronics. Functionally, they perform identically in offline switch applications.

Q: Are all three parts suitable for Boost, Buck, Buck-Boost, and Flyback topologies?

A: Yes. VIPER318HDTR, VIPER318LDTR, and VIPER319XDTR all support the complete range of Boost, Buck, Buck-Boost, and Flyback converter topologies with 132kHz switching frequency and 1W power rating.

Q: Do these parts require different PCB footprints?

A: No. All three parts use the 16-SOIC package with 0.154" (3.90mm) width. PCB footprints are identical, enabling direct component substitution without layout modifications.

Q: What is the operating temperature range for these parts?

A: All three parts operate across -40°C to 150°C junction temperature (TJ), providing identical thermal performance specifications for industrial and consumer applications.

Q: Are moisture sensitivity requirements the same across all three parts?

A: Yes. All parts are classified as Moisture Sensitivity Level 3 (168 hours), requiring identical handling, storage, and reflow protocols during manufacturing and assembly.

Q: Which part should be selected based on availability?

A: Selection is determined by current inventory and procurement lead times. VIPER318LDTR currently maintains the highest inventory at 5100 pieces, followed by VIPER319XDTR at 4529 pieces, and VIPER318HDTR at 4400 pieces. All parts are actively produced by STMicroelectronics.

Q: Do these parts have identical fault protection features?

A: Yes. All three parts include Over Load, Over Power, Over Temperature, Over Voltage, and Short Circuit protection with Soft Start control features.

Q: Are compliance certifications identical across all three parts?

A: Yes. VIPER318HDTR, VIPER318LDTR, and VIPER319XDTR are all ROHS3 compliant and REACH Unaffected, ensuring regulatory compatibility across global markets.