STR3A455 Equivalent & Substitute Parts

Part Overview

The STR3A455 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 65W 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 design requirements permit operation at reduced power output levels or when inventory constraints necessitate alternative sourcing while maintaining electrical and mechanical compatibility within the specified parameter envelope.

Substiute Parts

STR3A455

Sanken Electric USA Inc.In Stock: 1126STR3A455 Datasheet

Current PartRFQ

STR3A451

Sanken Electric USA Inc.In Stock: 961STR3A451 Datasheet

Parametric EquivalentRFQ

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 STR3A455 are qualified based on strict electrical and mechanical parameter alignment. All substitute candidates maintain identical specifications across the following critical parameters:

Invariant Parameters (Must Match Exactly):

• Topology: Flyback
• Output Isolation: Isolated
• Internal Switch(s): Yes
• Voltage - Breakdown: 650V
• Voltage - Supply (Vcc/Vdd): 8.5V ~ 32V
• Frequency - Switching: 65kHz
• Duty Cycle: 80%
• Voltage - Start Up: 15V
• Fault Protection: Current Limiting, Over Load, Over Temperature, Over Voltage
• Control Features: Soft Start
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected

Variable Parameter (Substitution Basis):

• Power (Watts): STR3A455 (65W) can be substituted with lower-rated alternatives STR3A451/STR3A451D (37W) or STR3A453D (53W) when application power requirements do not exceed the substitute device rating.

All substitute parts are manufactured by Sanken Electric USA Inc. and maintain Active product status.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain Active product status and full compliance with RoHS3 and REACH regulations, ensuring regulatory continuity in design implementations.

STR3A451 and STR3A451D Selection: These 37W-rated devices are suitable for applications where maximum power output does not exceed 37W. Both variants share identical electrical specifications and differ only in packaging designation. Selection between STR3A451 and STR3A451D is determined by inventory availability and packaging requirements.

STR3A453D Selection: This 53W-rated device provides intermediate power capacity between the 37W variants and the primary STR3A455 (65W). The STR3A453D is appropriate for applications requiring power output between 37W and 53W, offering a closer performance match to the STR3A455 while maintaining full parameter compatibility.

Power Rating Consideration: Substitute selection must ensure the chosen device power rating meets or exceeds the application's maximum power demand. Undersized power ratings result in thermal stress and potential device failure. Oversized ratings present no functional limitation.

All substitute parts are manufactured by Sanken Electric USA Inc. and maintain identical electrical characteristics, thermal operating range, fault protection mechanisms, and control features as the primary STR3A455 device.

Frequently Asked Questions (FAQ)

Q: Can STR3A451 or STR3A451D replace STR3A455 in any application?

A: STR3A451 and STR3A451D are suitable substitutes only when the application's maximum power requirement does not exceed 37W. All other electrical parameters, including topology, switching frequency, voltage ratings, and fault protection mechanisms, are identical. If the application requires power output exceeding 37W, these devices are not appropriate substitutes.

Q: What is the difference between STR3A451 and STR3A451D?

A: STR3A451 and STR3A451D are electrically identical. Both devices operate at 37W power output with matching electrical specifications. The designation difference reflects packaging or supplier device package classification. Selection between these variants is based on inventory availability and specific packaging requirements.

Q: Is STR3A453D a better substitute than STR3A451 for the STR3A455?

A: STR3A453D provides 53W power capacity, which more closely approaches the STR3A455 rating of 65W. For applications requiring power output between 37W and 53W, STR3A453D is the appropriate selection. For applications requiring power output between 53W and 65W, STR3A453D remains undersized and is not suitable. For applications requiring 65W or higher, only the STR3A455 meets the requirement.

Q: Are all substitute parts pin-compatible with STR3A455?

A: Yes. All substitute parts utilize the 8-DIP (0.300", 7.62mm) package with identical through-hole mounting configuration. Pin-to-pin compatibility is maintained across all variants.

Q: Do substitute parts maintain the same operating temperature range?

A: Yes. All substitute parts operate across the identical temperature range of -40°C to 125°C, ensuring thermal compatibility in equivalent application environments.

Q: Are there any compliance differences between STR3A455 and its substitutes?

A: No. All parts maintain ROHS3 compliance, REACH unaffected status, and Moisture Sensitivity Level 1 (Unlimited). Regulatory and environmental compliance is uniform across all variants.

Q: What fault protection features are present in substitute devices?

A: All substitute parts include identical fault protection mechanisms: Current Limiting, Over Load, Over Temperature, and Over Voltage protection. Soft Start control features are also present in all variants.

Q: Can STR3A455 be used as a substitute for lower-rated alternatives?

A: Yes. The STR3A455 (65W) can be used in applications designed for STR3A451/STR3A451D (37W) or STR3A453D (53W) without functional limitation. Higher power ratings do not create compatibility issues in lower-power applications.