STR3A251 Equivalent & Substitute Parts

Part Overview

The STR3A251 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 67kHz 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. Alternative equivalent parts within the STR3A200 series are available to accommodate different power output requirements and design specifications while maintaining core electrical and mechanical compatibility.

Substiute Parts

STR3A251

Sanken Electric USA Inc.In Stock: 1057STR3A251 Datasheet

Current PartRFQ

STR3A251D

Sanken Electric USA Inc.In Stock: 913STR3A251D Datasheet

Parametric EquivalentRFQ

STR3A253D

Sanken Electric USA Inc.In Stock: 1128STR3A253D Datasheet

Parametric EquivalentRFQ

STR3A255D

Sanken Electric USA Inc.In Stock: 1244STR3A255D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution within the STR3A200 series is determined by electrical and mechanical parameter compatibility. All substitute parts maintain identical specifications across the following critical parameters: topology (Flyback), output isolation (Isolated), internal switching capability, voltage breakdown rating (650V), supply voltage range (8.5V ~ 32V), startup voltage (47V), switching frequency (67kHz), duty cycle (75%), fault protection features (Current Limiting, Over Load, Over Temperature, Over Voltage), control features (Soft Start), operating temperature range (-40°C ~ 125°C), package type (8-DIP through-hole), RoHS3 compliance, and REACH unaffected status.

The primary differentiating parameter among substitute parts is Power (Watts) output rating. The STR3A251 delivers 37W, while substitute options STR3A251D and STR3A253D provide 37W and 53W respectively, and STR3A255D provides 65W. Selection of substitute parts is based on application power requirements while maintaining all other electrical and mechanical characteristics.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts within the STR3A200 series maintain Active product status with full regulatory compliance. Selection between STR3A251, STR3A251D, STR3A253D, and STR3A255D is determined by application power requirements. The STR3A251 and STR3A251D both deliver 37W output and are electrically equivalent. The STR3A253D provides 53W output capacity, and the STR3A255D provides 65W output capacity. All parts share identical electrical characteristics, mechanical packaging, and compliance certifications (RoHS3 Compliant, REACH Unaffected). Through-hole 8-DIP package configuration is consistent across all variants, enabling direct board-level substitution when power requirements align with device ratings.

Frequently Asked Questions (FAQ)

Q: Can STR3A251D be used as a direct replacement for STR3A251?

A: Yes. Both parts are electrically and mechanically equivalent, delivering 37W output with identical electrical specifications, 8-DIP through-hole packaging, and compliance certifications.

Q: What is the primary difference between STR3A251 and STR3A253D?

A: The primary difference is power output rating. STR3A251 delivers 37W while STR3A253D delivers 53W. All other electrical parameters, topology, protection features, and package configuration remain identical.

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

A: Yes. All substitute parts utilize identical 8-DIP (0.300", 7.62mm) through-hole packaging, enabling direct board-level substitution without layout modifications.

Q: Do substitute parts maintain the same fault protection capabilities?

A: Yes. All parts in the STR3A200 series include identical fault protection: Current Limiting, Over Load, Over Temperature, and Over Voltage protection with Soft Start control features.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts are RoHS3 Compliant and REACH Unaffected with Moisture Sensitivity Level 1 (Unlimited).

Q: Can STR3A255D replace STR3A251 in a 37W application?

A: Yes. STR3A255D delivers 65W output and maintains all identical electrical specifications, topology, and protection features as STR3A251. Higher power rating does not prevent substitution in lower power applications.

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

A: All parts operate across -40°C to 125°C (TA), providing identical thermal performance specifications.