STR3A151 Equivalent & Substitute Parts

Part Overview

The STR3A151 is an offline switch flyback converter IC manufactured by Sanken Electric USA Inc., designed for isolated power management applications. This 8-DIP through-hole component operates at 67kHz switching frequency with 37W power output capability and integrated fault protection including current limiting, overload, overvoltage, and overtemperature protection.

The STR3A151 is classified as obsolete. Equivalent substitute parts within the STR3A100 series maintain identical electrical and mechanical specifications, enabling direct replacement in existing designs while ensuring continuity of supply.

Substiute Parts

STR3A151

Sanken Electric USA Inc.In Stock: 2915STR3A151 Datasheet

Current PartRFQ

STR3A151D

Sanken Electric USA Inc.In Stock: 4342STR3A151D Datasheet

Parametric EquivalentRFQ

STR3A152

Sanken Electric USA Inc.In Stock: 914STR3A152 Datasheet

Parametric EquivalentRFQ

STR3A152D

Sanken Electric USA Inc.In Stock: 3026STR3A152D Datasheet

Parametric EquivalentRFQ

STR3A153

Sanken Electric USA Inc.In Stock: 2074STR3A153 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution within the STR3A100 series is determined by the following critical parameters that must remain constant:

Fixed Parameters (All Substitutes Match):

• Topology: Flyback
• Output Isolation: Isolated
• Voltage - Breakdown: 650V
• Voltage - Supply (Vcc/Vdd): 8.1V ~ 32V
• Voltage - Start Up: 15.3V
• Frequency - Switching: 67kHz
• Duty Cycle: 74%
• Fault Protection: Current Limiting, Over Load, Over Temperature, Over Voltage
• Operating Temperature: -40°C ~ 115°C (TA)
• Package / Case: 8-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• RoHS Status: RoHS Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Variable Parameter (Differentiates Part Numbers):

• Power (Watts): 37W (STR3A151), 45W (STR3A152, STR3A152D), 53W (STR3A153)

The STR3A151 and STR3A151D are direct parametric equivalents with identical 37W power ratings. The STR3A152 and STR3A152D variants provide 45W capability, while STR3A153 delivers 53W. Selection depends on application power requirements within the same electrical and mechanical envelope.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (STR3A151 ↔ STR3A151D): STR3A151D is the direct parametric equivalent of STR3A151. Both parts are RoHS compliant, obsolete status, and deliver identical 37W power output. Selection between these two is based on inventory availability and packaging designation preference.

Uprated Substitutes (STR3A151 → STR3A152 / STR3A152D / STR3A153): The STR3A152, STR3A152D, and STR3A153 variants are electrically and mechanically compatible with STR3A151 within the same 8-DIP package and identical electrical operating parameters. These parts provide higher power ratings (45W and 53W respectively) while maintaining all other specifications. Uprated substitution is applicable when design margins or application requirements permit higher power capability.

All substitute parts maintain RoHS compliance and identical fault protection features. The choice among STR3A152D, STR3A152, and STR3A153 depends on application power requirements and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can STR3A151D replace STR3A151 directly? A: Yes. STR3A151D is a direct parametric equivalent with identical electrical specifications (37W power output, 650V breakdown voltage, 67kHz switching frequency) and mechanical package (8-DIP through-hole). Both are RoHS compliant and obsolete status.

Q: Can STR3A152 or STR3A153 be used instead of STR3A151? A: Yes, within design constraints. STR3A152 and STR3A153 maintain identical electrical operating parameters (voltage supply range, switching frequency, fault protection, operating temperature) and package form factor. The difference is power rating: STR3A152 delivers 45W and STR3A153 delivers 53W compared to STR3A151's 37W. Substitution is valid if the application can accommodate higher power capability.

Q: What is the difference between STR3A152 and STR3A152D? A: Both variants are parametrically identical with 45W power output, 650V breakdown voltage, and 67kHz switching frequency. The designation difference reflects packaging or manufacturing variant. Both are RoHS compliant and suitable for 8-DIP through-hole mounting.

Q: Are all substitute parts in the same package? A: Yes. All parts in this substitution group (STR3A151, STR3A151D, STR3A152, STR3A152D, STR3A153) use 8-DIP (0.300", 7.62mm) through-hole package, enabling direct PCB compatibility.

Q: What determines which substitute to select? A: Selection is based on application power requirements and inventory availability. STR3A151/STR3A151D for 37W applications, STR3A152/STR3A152D for 45W applications, and STR3A153 for 53W applications. All maintain identical electrical operating parameters and fault protection features.