BY458TAP Equivalent & Substitute Parts

Part Overview

The BY458TAP is an avalanche diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 1200 V DC reverse voltage with 2 A average rectified current. This through-hole component in SOD-57 axial package is designed for applications requiring avalanche breakdown protection and standard recovery characteristics. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance parameters are required but the original part is unavailable or when alternative packaging or thermal characteristics better suit specific application requirements.

Substiute Parts

BY458TAP

Vishay General Semiconductor - Diodes DivisionIn Stock: 5254BY458TAP Datasheet

Current PartRFQ

STTH112RL

STMicroelectronicsIn Stock: 65308STTH112RL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BY458TAP is determined by matching the following critical electrical and mechanical parameters:

Primary Matching Criteria:

• Voltage - DC Reverse (Vr) (Max): 1200 V minimum
• Mounting Type: Through Hole
• RoHS3 Compliance: Required
• Product Status: Active

Secondary Compatibility Factors:

• Current - Average Rectified (Io): Rated capacity must support application requirements
• Package / Case: Physical form factor and pin configuration
• Operating Temperature - Junction: Thermal rating for application environment
• Reverse Recovery Time (trr): Speed classification for circuit performance

The STTH112RL substitute part meets the primary voltage and mounting requirements while maintaining RoHS3 compliance and Active product status. Differences in current rating, recovery speed, and package form factor require engineering evaluation for specific application compatibility.

Parameter Comparison

Engineering Selection Recommendations

BY458TAP Selection Criteria: The BY458TAP is the primary component choice when avalanche technology is specified, 2 A current capacity is required, and SOD-57 package form factor is mandated by board layout or mechanical constraints. This part maintains Active product status with full RoHS3 compliance and REACH unaffected designation, supporting compliance requirements for regulated applications.

STTH112RL Substitution Criteria: The STTH112RL substitute part is applicable when the application circuit supports 1 A maximum current operation and DO-41 package form factor is acceptable. This substitute provides higher operating temperature rating (175°C vs. 140°C) and faster recovery characteristics (75 ns vs. 2 µs). Both parts maintain identical 1200 V reverse voltage rating and RoHS3 compliance status. The substitute uses standard recovery technology rather than avalanche technology, requiring circuit-level evaluation for functional equivalence.

Compliance Status: Both parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.10.0080. Moisture sensitivity level is 1 (Unlimited) for both components, indicating no special moisture handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: Can STTH112RL directly replace BY458TAP in all applications?

A: Direct replacement is limited by current rating difference. The STTH112RL is rated for 1 A average rectified current versus 2 A for the BY458TAP. Substitution is valid only when application circuit current requirements do not exceed 1 A at the diode. Additionally, technology difference (Standard vs. Avalanche) requires circuit-level functional verification.

Q: What is the significance of the package difference between SOD-57 and DO-41?

A: SOD-57 and DO-41 are both axial through-hole packages with different physical dimensions and lead spacing. Board layout, PCB hole pattern, and mechanical clearance requirements determine package compatibility. Physical substitution requires confirmation that DO-41 leads fit existing SOD-57 mounting holes and that component height does not create clearance conflicts.

Q: How does reverse recovery time affect circuit performance?

A: The BY458TAP has 2 µs reverse recovery time (standard recovery), while STTH112RL has 75 ns (fast recovery). Faster recovery reduces switching losses and improves high-frequency performance. In low-frequency or DC applications, this difference has minimal impact. High-frequency circuits may benefit from the faster recovery characteristic of the substitute.

Q: Are both parts suitable for high-temperature applications?

A: The BY458TAP operates to 140°C junction temperature maximum, while STTH112RL operates to 175°C. For applications requiring sustained operation above 140°C, the STTH112RL provides additional thermal margin. Both parts maintain RoHS3 compliance across their operating ranges.

Q: What is the difference between avalanche and standard recovery technology?

A: Avalanche technology (BY458TAP) provides controlled breakdown at reverse voltage, offering protection against voltage transients. Standard technology (STTH112RL) does not provide this avalanche protection characteristic. Circuit design determines whether avalanche protection is functionally required or if standard rectification performance is sufficient.

Q: Do both parts have identical compliance certifications?

A: Yes. Both BY458TAP and STTH112RL are ROHS3 compliant, REACH unaffected, and classified as EAR99 with HTSUS code 8541.10.0080. Moisture sensitivity level is 1 (Unlimited) for both, requiring no special moisture control during handling or storage.