STTA512FP Equivalent & Substitute Parts

Part Overview

The STTA512FP is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 1200 V DC reverse voltage and 5 A average rectified current. The device is packaged in a TO-220-2 Full Pack with isolated tab configuration and features fast recovery characteristics with a reverse recovery time of 95 ns. The STTA512FP is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements.

Substiute Parts

STTA512FP

STMicroelectronicsIn Stock: 1698STTA512FP Datasheet

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STTH512FP

STMicroelectronicsIn Stock: 16130STTH512FP Datasheet

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DSI30-12AC

IXYSIn Stock: 737DSI30-12AC Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the STTA512FP is determined by the following critical parameters:

Voltage Rating: The substitute must maintain a DC reverse voltage rating of 1200 V or higher to ensure equivalent or superior voltage withstand capability.

Current Rating: The substitute must support the 5 A average rectified current requirement. Substitutes with higher current ratings remain compatible with circuits designed for 5 A operation.

Recovery Characteristics: Fast recovery diodes with reverse recovery time ≤ 500 ns are classified as equivalent. Standard recovery diodes with trr > 500 ns represent functional alternatives with different switching performance characteristics.

Mounting and Packaging: Through-hole mounting is required. Package compatibility is determined by PCB layout constraints and thermal management requirements.

Compliance and Status: Active product status is preferred for long-term availability. RoHS3 compliance and REACH unaffected status are maintained across all listed substitutes.

Parameter Comparison

Engineering Selection Recommendations

STTH512FP (STMicroelectronics): This component is the direct functional equivalent of the STTA512FP. Both devices share identical voltage and current ratings, forward voltage characteristics, and fast recovery time specifications. The STTH512FP is classified as active product status, ensuring long-term availability and supply chain continuity. The STTH512FP exhibits superior reverse leakage characteristics (5 µA versus 100 µA) and a higher maximum junction temperature rating (175°C versus 150°C). Both components maintain TO-220-2 Full Pack isolated tab packaging and ROHS3 compliance. The STTH512FP is the preferred substitute for direct replacement in existing STTA512FP applications.

DSI30-12AC (IXYS): This component provides a higher current rating of 30 A while maintaining the 1200 V voltage specification. The DSI30-12AC is suitable for applications requiring increased current capacity beyond the 5 A specification of the STTA512FP. The device features a lower forward voltage drop (1.45 V @ 45 A) and operates with standard recovery characteristics (> 500 ns). The DSI30-12AC uses ISOPLUS220™ packaging, which differs from the TO-220-2 configuration. This substitute is applicable when circuit topology permits package substitution and when higher current handling is beneficial. The DSI30-12AC maintains ROHS3 compliance and active product status.

Frequently Asked Questions (FAQ)

Q: Can the STTH512FP directly replace the STTA512FP in existing designs?

A: Yes. The STTH512FP maintains identical voltage ratings (1200 V), current ratings (5 A), forward voltage characteristics (2.2 V @ 5 A), and fast recovery time (95 ns). Both components use TO-220-2 Full Pack isolated tab packaging. The STTH512FP is the direct functional equivalent and requires no circuit modifications.

Q: What are the differences between the STTH512FP and STTA512FP?

A: The primary differences are product status and electrical performance. The STTH512FP is active product, while the STTA512FP is obsolete. The STTH512FP exhibits lower reverse leakage current (5 µA versus 100 µA @ 1200 V) and a higher maximum junction temperature (175°C versus 150°C). These differences represent improvements in the active equivalent.

Q: When should the DSI30-12AC be considered as a substitute?

A: The DSI30-12AC is applicable when circuit design permits higher current capacity (30 A versus 5 A) and when package substitution from TO-220-2 to ISOPLUS220™ is feasible. The DSI30-12AC operates with standard recovery characteristics rather than fast recovery, which affects switching performance in high-frequency applications. This substitute is suitable for applications where increased current handling and lower forward voltage drop are advantageous.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. The STTH512FP and DSI30-12AC are both ROHS3 compliant and REACH unaffected, matching the compliance status of the STTA512FP.

Q: What is the impact of different recovery time specifications?

A: The STTA512FP and STTH512FP both feature fast recovery characteristics (95 ns trr), suitable for high-frequency switching applications. The DSI30-12AC operates with standard recovery characteristics (> 500 ns), resulting in higher switching losses and slower turn-off behavior. Fast recovery diodes are preferred in applications requiring rapid switching transitions.

Q: Does package substitution from TO-220-2 to ISOPLUS220™ require PCB redesign?

A: Yes. The ISOPLUS220™ package used by the DSI30-12AC has different pin configuration and thermal characteristics compared to the TO-220-2 Full Pack isolated tab package. PCB layout modifications are required for mechanical fit and thermal management optimization.