BYW81P-200 Equivalent & Substitute Parts

Part Overview

The BYW81P-200 is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 200 V DC reverse voltage and 15 A average rectified current in a TO-220AC through-hole package. This part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical and mechanical compatibility while meeting current product availability and compliance standards.

Substiute Parts

BYW81P-200

STMicroelectronicsIn Stock: 2035BYW81P-200 Datasheet

Current PartRFQ

STTH1502D

STMicroelectronicsIn Stock: 2749STTH1502D Datasheet

DirectRFQ

SDUR1520

SMC Diode SolutionsIn Stock: 760SDUR1520 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BYW81P-200 are selected based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Primary Matching Criteria:

• Voltage - DC Reverse (Vr) (Max): 200 V
• Current - Average Rectified (Io): 15 A
• Package / Case: TO-220-2
• Mounting Type: Through Hole
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

• Operating Temperature Range compatibility
• Reverse Recovery Time (trr) performance
• Reverse Leakage Current characteristics
• RoHS and REACH compliance status

All identified substitutes meet the primary electrical and mechanical requirements. Differences in forward voltage, reverse recovery time, and maximum junction temperature represent performance variations within the fast-recovery rectifier diode category and do not preclude functional substitution.

Parameter Comparison

Engineering Selection Recommendations

STTH1502D (STMicroelectronics): This part is the primary direct substitute for the BYW81P-200. Both devices are manufactured by STMicroelectronics and share identical electrical ratings for voltage and current. The STTH1502D is in active product status with superior availability (2694 units in stock). Performance characteristics show improved reverse recovery time (36 ns versus 40 ns) and reduced reverse leakage current (10 µA versus 20 µA). Maximum junction temperature is elevated to 175°C, providing enhanced thermal margin. Full ROHS3 compliance and REACH unaffected status are maintained. This part is suitable for direct replacement in new designs and production transitions.

SDUR1520 (SMC Diode Solutions): This part provides an alternative substitute from a different manufacturer while maintaining identical voltage and current ratings. The SDUR1520 demonstrates the lowest forward voltage (1.05 V @ 15 A) and fastest reverse recovery time (35 ns) among the three options. Operating temperature range extends to -55°C minimum, supporting wider environmental applications. ROHS3 compliance is confirmed; however, REACH status is listed as affected. Inventory availability is lower (684 units). This part is suitable for applications where SMC Diode Solutions qualification is acceptable and thermal or speed performance benefits are required.

Both substitutes are electrically and mechanically compatible with the BYW81P-200 and support continued system operation beyond the obsolescence of the original part.

Frequently Asked Questions (FAQ)

Q: Can the STTH1502D directly replace the BYW81P-200 in existing designs?

A: Yes. The STTH1502D meets all primary electrical specifications (200 V, 15 A) and uses the identical TO-220-2 package. Performance characteristics are equivalent or superior. No circuit modifications are required.

Q: What is the difference between the STTH1502D and SDUR1520?

A: Both parts meet the core voltage and current requirements. The STTH1502D is manufactured by STMicroelectronics (original manufacturer) with a maximum junction temperature of 175°C. The SDUR1520 is manufactured by SMC Diode Solutions with a wider operating temperature range (-55°C to 150°C) and lower forward voltage. Selection depends on manufacturer qualification requirements and thermal design margins.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All three parts use the TO-220-2 package with TO-220AC supplier device packaging. Through-hole mounting is identical. PCB layout and thermal management requirements remain unchanged.

Q: Why does the BYW81P-200 show higher forward voltage than the substitutes?

A: The BYW81P-200 forward voltage is specified at 25 A, while substitutes are specified at 15 A. Forward voltage increases with current. At equivalent current levels, the substitutes demonstrate lower forward voltage characteristics, indicating improved efficiency.

Q: What compliance certifications apply to these substitutes?

A: All three parts are ROHS3 compliant. The STTH1502D and BYW81P-200 are REACH unaffected. The SDUR1520 is REACH affected. Compliance requirements should be verified against specific application and regional regulations.

Q: Is reverse recovery time a critical factor for substitution?

A: Reverse recovery time affects switching performance and electromagnetic interference characteristics. The BYW81P-200 specifies 40 ns, while substitutes offer 35-36 ns. Faster recovery times reduce switching losses and noise. For most general-purpose rectification applications, these differences are not critical; however, high-frequency switching circuits may benefit from the improved performance of substitute parts.

Q: What inventory considerations should guide part selection?

A: The STTH1502D offers the highest inventory availability (2694 units), supporting immediate procurement and production continuity. The SDUR1520 has lower availability (684 units). For long-term production planning, the STTH1502D is the preferred choice due to supply reliability.