STTH512B Equivalent & Substitute Parts

Part Overview

The STTH512B is a general-purpose fast recovery rectifier diode rated for 1200 V DC reverse voltage and 5 A average rectified current in a surface mount DPAK package. This component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing design support and procurement continuity. The STTH512B-TR provides functional equivalence with improved product status and availability characteristics.

Substiute Parts

STTH512B

STMicroelectronicsIn Stock: 3781STTH512B Datasheet

Current PartRFQ

STTH512B-TR

STMicroelectronicsIn Stock: 20234STTH512B-TR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the STTH512B with the STTH512B-TR is based on electrical and mechanical parameter equivalence. Both parts share identical specifications across all critical performance parameters:

Key Parameters for Substitution Validation:

• Voltage - DC Reverse (Vr) (Max): 1200 V
• Current - Average Rectified (Io): 5 A
• Voltage - Forward (Vf) (Max) @ If: 2.2 V @ 5 A
• Reverse Recovery Time (trr): 95 ns
• Current - Reverse Leakage @ Vr: 5 µA @ 1200 V
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
• Operating Temperature - Junction (Max): 175°C

The STTH512B-TR maintains full electrical and mechanical compatibility with the original STTH512B, with the primary distinction being product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The STTH512B-TR is the direct substitute for the STTH512B. Selection of the STTH512B-TR is based on the following factors:

Product Status: The STTH512B-TR carries an Active product status, ensuring continued manufacturer support, availability, and compliance with current regulatory requirements. The original STTH512B is classified as Obsolete, limiting long-term procurement viability.

Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH Unaffected status. The STTH512B-TR demonstrates improved moisture sensitivity characteristics (MSL 1 vs. MSL 3), indicating enhanced reliability for storage and handling.

Electrical and Mechanical Equivalence: All electrical parameters, including voltage ratings, current ratings, forward voltage drop, reverse recovery time, and leakage current, are identical. The package footprint and mounting type are unchanged, permitting direct board-level substitution without design modification.

Availability: The STTH512B-TR maintains significantly higher inventory levels (20,167 units) compared to the obsolete STTH512B (3,757 units), supporting production continuity and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the STTH512B-TR be used as a direct replacement for the STTH512B without circuit modification?

A: Yes. The STTH512B-TR is electrically and mechanically equivalent to the STTH512B. All electrical parameters, including voltage ratings, current ratings, forward voltage characteristics, and switching speed, are identical. The package footprint (TO-252-3 DPAK) and pin configuration are unchanged, permitting direct substitution at the board level without design alteration.

Q: What is the primary reason for substituting the STTH512B?

A: The STTH512B is classified as Obsolete, which restricts manufacturer support and long-term procurement availability. The STTH512B-TR, with Active product status, provides equivalent functionality with assured supply chain continuity and ongoing compliance with regulatory standards.

Q: Are there differences in packaging or handling requirements between the STTH512B and STTH512B-TR?

A: The STTH512B-TR features improved moisture sensitivity characteristics (MSL 1 with unlimited shelf life) compared to the STTH512B (MSL 3 with 168-hour limitation). This enhancement reduces moisture-related reliability risks during storage and handling. Both parts use identical surface mount DPAK packaging.

Q: Do both parts meet current regulatory compliance standards?

A: Yes. Both the STTH512B and STTH512B-TR are ROHS3 compliant and REACH Unaffected. The STTH512B-TR maintains these certifications with Active product status, ensuring continued compliance with evolving regulatory requirements.

Q: What are the key electrical parameters that define substitution compatibility?

A: Substitution compatibility is determined by matching the following parameters: Voltage - DC Reverse (Vr) (Max) at 1200 V, Current - Average Rectified (Io) at 5 A, Voltage - Forward (Vf) (Max) at 2.2 V @ 5 A, Reverse Recovery Time (trr) at 95 ns, and Current - Reverse Leakage @ Vr at 5 µA @ 1200 V. The STTH512B-TR matches all these specifications.

Q: Is the DPAK package suitable for high-volume surface mount assembly?

A: Yes. The TO-252-3 DPAK package is a standard surface mount package widely supported by automated assembly equipment. Both the STTH512B and STTH512B-TR use this package format, ensuring compatibility with conventional manufacturing processes.