STR3A451D Equivalent & Substitute Parts

Part Overview

The STR3A451D 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.

Substiute Parts

STR3A451D

Sanken Electric USA Inc.In Stock: 961STR3A451D Datasheet

Current PartRFQ

STR3A451

Sanken Electric USA Inc.In Stock: 961STR3A451 Datasheet

Parametric EquivalentRFQ

STR3A453D

Sanken Electric USA Inc.In Stock: 737STR3A453D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the STR3A451D are identified based on strict parametric equivalence across critical electrical and mechanical specifications. The substitution logic is based on the following key parameters that must remain constant or compatible:

Electrical Parameters (Must Match):

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

Mechanical Parameters (Must Match):

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

Compliance Parameters (Must Match):

• RoHS Status: ROHS3 Compliant
• REACH Status: REACH Unaffected
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The STR3A451D has two identified substitute parts: STR3A451 and STR3A453D. The STR3A451 is a parametric equivalent with identical electrical and mechanical specifications. The STR3A453D shares all critical parameters with the exception of Power (Watts) rating, which is 53W compared to 37W in the main part.

Parameter Comparison

Engineering Selection Recommendations

STR3A451 (Parametric Equivalent): The STR3A451 is a direct parametric equivalent to the STR3A451D with identical electrical specifications, power rating (37W), and mechanical packaging. Both parts maintain Active product status with full RoHS3 compliance and REACH unaffected designation. Selection between STR3A451D and STR3A451 is based on packaging format availability and inventory requirements, as all functional parameters are equivalent.

STR3A453D (Higher Power Rating Variant): The STR3A453D shares all critical electrical parameters with the STR3A451D, including topology, switching frequency, voltage specifications, and protection features. The primary distinction is the increased power rating of 53W compared to 37W in the STR3A451D. The STR3A453D maintains identical package configuration (8-DIP through-hole), operating temperature range, and compliance certifications (RoHS3 Compliant, REACH Unaffected). Selection of STR3A453D is appropriate for applications requiring higher power capacity within the same form factor and electrical operating parameters.

All three parts are classified as Active products with unlimited moisture sensitivity rating and full regulatory compliance, ensuring long-term availability and design stability.

Frequently Asked Questions (FAQ)

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

A: Yes. The STR3A451 is a parametric equivalent with identical electrical specifications, power rating, switching frequency, voltage parameters, and package configuration. Both parts are Active status with RoHS3 compliance and REACH unaffected designation.

Q: What is the primary difference between STR3A451D and STR3A453D?

A: The STR3A453D has a higher power rating of 53W compared to 37W in the STR3A451D. All other electrical parameters, including topology, switching frequency, voltage specifications, duty cycle, and protection features, remain identical. Both use the same 8-DIP through-hole package.

Q: Are all three parts (STR3A451D, STR3A451, STR3A453D) pin-compatible?

A: Yes. All three parts use the 8-DIP (0.300", 7.62mm) package with through-hole mounting, ensuring mechanical and pin compatibility on PCBs designed for this package format.

Q: Can STR3A453D replace STR3A451D in a 37W application?

A: Yes. The STR3A453D is rated for 53W, which exceeds the 37W requirement of the STR3A451D. The higher power rating does not prevent operation in lower power applications. All electrical parameters remain compatible.

Q: What compliance certifications apply to all substitute parts?

A: All three parts (STR3A451D, STR3A451, STR3A453D) are RoHS3 Compliant, REACH Unaffected, and have Moisture Sensitivity Level 1 (Unlimited). All maintain Active product status.

Q: Are there any differences in operating temperature range between the substitute parts?

A: No. All three parts operate across the identical temperature range of -40°C to 125°C.

Q: What protection features are included in all substitute parts?

A: All three parts include Current Limiting, Over Load, Over Temperature, and Over Voltage fault protection, plus Soft Start control features.