STR3A451 Equivalent & Substitute Parts

Part Overview

The STR3A451 is an AC/DC converter integrated circuit manufactured by Sanken Electric USA Inc., designed for offline flyback topology applications. This Power Management (PMIC) component operates at 65kHz switching frequency with 37W power output capability and integrated internal switching functionality. The device is classified as Active product status with full RoHS3 compliance and REACH unaffected designation.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part specifications, enabling direct replacement in circuit designs without functional degradation. The STR3A451 series includes parametric equivalents that maintain core operational characteristics while offering alternative packaging variants or enhanced power ratings.

Substiute Parts

STR3A451

Sanken Electric USA Inc.In Stock: 961STR3A451 Datasheet

Current PartRFQ

STR3A451D

Sanken Electric USA Inc.In Stock: 961STR3A451D Datasheet

Parametric EquivalentRFQ

STR3A453D

Sanken Electric USA Inc.In Stock: 737STR3A453D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the STR3A451 are identified based on strict alignment of electrical and mechanical parameters. The substitution logic is based on the following critical parameters:

Electrical Equivalence Criteria:

• Topology: Flyback (identical across all parts)
• Switching Frequency: 65kHz (identical across all parts)
• Voltage - Breakdown: 650V (identical across all parts)
• Voltage - Supply Range: 8.5V ~ 32V (identical across all parts)
• Voltage - Start Up: 15V (identical across all parts)
• Duty Cycle: 80% (identical across all parts)
• Output Isolation: Isolated (identical across all parts)
• Internal Switch(s): Yes (identical across all parts)
• Fault Protection: Current Limiting, Over Load, Over Temperature, Over Voltage (identical across all parts)
• Control Features: Soft Start (identical across all parts)
• Operating Temperature Range: -40°C ~ 125°C (identical across all parts)

Mechanical Equivalence Criteria:

• Package / Case: 8-DIP (0.300", 7.62mm) (identical across all parts)
• Mounting Type: Through Hole (identical across all parts)
• Supplier Device Package: 8-DIP (identical across all parts)

Compliance Equivalence Criteria:

• RoHS Status: ROHS3 Compliant (identical across all parts)
• Moisture Sensitivity Level: 1 (Unlimited) (identical across all parts)
• REACH Status: REACH Unaffected (identical across all parts)
• ECCN: EAR99 (identical across all parts)

The STR3A451D and STR3A453D are classified as parametric equivalents. The STR3A451D maintains identical power rating (37W), while the STR3A453D provides enhanced power output (53W) within the same electrical and mechanical framework.

Parameter Comparison

Engineering Selection Recommendations

All three parts—STR3A451, STR3A451D, and STR3A453D—maintain Active product status with full RoHS3 compliance and REACH unaffected designation, ensuring regulatory compliance across all substitute selections.

STR3A451 and STR3A451D: These parts are direct electrical and mechanical equivalents with identical 37W power output. Selection between these two is based on packaging variant availability and inventory requirements. Both support identical circuit implementations.

STR3A453D: This part provides enhanced power output capability at 53W while maintaining all other electrical and mechanical parameters identical to the STR3A451 series. The STR3A453D is suitable for applications requiring higher power delivery within the same form factor and operating envelope. Circuit design modifications are not required for thermal management or electrical interface changes, as the enhanced power rating operates within the same voltage and frequency specifications.

All parts are manufactured by Sanken Electric USA Inc. and share identical 8-DIP through-hole packaging, enabling direct PCB-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can STR3A451D be used as a direct replacement for STR3A451?

A: Yes. The STR3A451D is a parametric equivalent with identical electrical specifications (37W power output, 65kHz switching frequency, 650V breakdown voltage, 8.5V ~ 32V supply range) and mechanical packaging (8-DIP through-hole). Direct substitution is supported without circuit design changes.

Q: What is the primary difference between STR3A451 and STR3A453D?

A: The STR3A453D provides 53W power output compared to the 37W rating of STR3A451. All other electrical parameters—topology, switching frequency, voltage ratings, duty cycle, operating temperature range, and fault protection features—remain identical. The STR3A453D is suitable for higher power applications within the same circuit topology.

Q: Are all three parts compatible with the same PCB layout?

A: Yes. All three parts share identical 8-DIP (0.300", 7.62mm) through-hole packaging and mounting specifications. PCB layouts designed for STR3A451 accommodate STR3A451D and STR3A453D without modification.

Q: Do compliance certifications differ between the substitute parts?

A: No. All three parts maintain identical RoHS3 compliance, REACH unaffected status, and Moisture Sensitivity Level 1 (Unlimited) designation. Regulatory requirements are satisfied across all substitute selections.

Q: What fault protection features are present in all substitute parts?

A: All parts include Current Limiting, Over Load, Over Temperature, and Over Voltage protection with Soft Start control features. Fault protection specifications are identical across STR3A451, STR3A451D, and STR3A453D.

Q: Can STR3A453D be used in applications originally designed for STR3A451?

A: Yes. The STR3A453D operates within identical electrical parameters and packaging specifications. The enhanced 53W power rating provides additional capability margin without requiring circuit modifications. Applications designed for 37W operation function with the STR3A453D at equivalent performance levels.

Q: What is the operating temperature range for all substitute parts?

A: All three parts operate across -40°C to 125°C. Operating temperature specifications are identical across STR3A451, STR3A451D, and STR3A453D.