S8AL-TP Equivalent & Substitute Parts

Part Overview

The S8AL-TP is a 50 V, 8A surface mount rectifier diode manufactured by Micro Commercial Co in DO-214AB (SMC) package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent or substitute parts is necessary for maintenance, repair, and legacy system support where the original component is no longer readily available or when design flexibility permits component selection from active product lines.

Substiute Parts

S8AL-TP

Micro Commercial CoIn Stock: 753S8AL-TP Datasheet

Current PartRFQ

RS3A-M3/57T

Vishay General Semiconductor - Diodes DivisionIn Stock: 1160RS3A-M3/57T Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the S8AL-TP is evaluated based on the following critical parameters that must align with the original component specifications:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 50 V minimum
• Package / Case: DO-214AB (SMC) surface mount
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C to 150°C minimum

Current Rating Consideration: The S8AL-TP is rated for 8A average rectified current. Substitute parts with lower current ratings (such as 3A) do not meet the electrical requirements for direct substitution in applications requiring the full 8A capacity. Such parts are listed as reference only and are not suitable for equivalent replacement in circuits designed for 8A operation.

Recovery Speed: The S8AL-TP operates with Standard Recovery (>500ns). Substitute parts with faster recovery characteristics (≤500ns) represent an improvement in performance and are acceptable for substitution.

Forward Voltage and Leakage: Variations in forward voltage drop and reverse leakage current within the specified operating conditions are acceptable provided the part meets the voltage and current ratings.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The RS3A-M3/57T does not qualify as a direct equivalent substitute for the S8AL-TP due to a critical current rating mismatch. The RS3A-M3/57T is rated for 3A average rectified current, while the S8AL-TP is rated for 8A. In applications where the circuit requires 8A operation, the RS3A-M3/57T will not provide adequate current capacity and will result in component failure or circuit malfunction.

Product Status Consideration:

The S8AL-TP carries "Not For New Designs" status, indicating end-of-life classification. The RS3A-M3/57T is classified as "Active" with ROHS3 compliance and MSL Level 1 rating, making it suitable for new designs and ongoing production where component selection is not constrained by legacy requirements.

Packaging and Compliance:

Both parts share identical package specifications (DO-214AB, SMC) and operating temperature ranges (-55°C to 150°C). The RS3A-M3/57T offers improved compliance status (ROHS3 Compliant, MSL 1) compared to the S8AL-TP. Both parts carry REACH Unaffected and EAR99 ECCN classifications.

Performance Characteristics:

The RS3A-M3/57T exhibits faster recovery time (≤500ns versus >500ns), lower capacitance (44pF versus 150pF), and higher reverse leakage current (10µA versus 5µA). These characteristics represent performance improvements in switching speed and reduced parasitic effects, though the higher leakage current may require evaluation in low-power or precision applications.

Frequently Asked Questions (FAQ)

Q: Can the RS3A-M3/57T replace the S8AL-TP in my circuit?

A: Direct replacement is not recommended. The RS3A-M3/57T is rated for 3A maximum average rectified current, while the S8AL-TP is rated for 8A. If your circuit requires 8A operation, the RS3A-M3/57T will not provide adequate current capacity. If your circuit operates at 3A or below, the RS3A-M3/57T is mechanically and electrically compatible in terms of package, voltage rating, and temperature range.

Q: Are the package dimensions identical between these parts?

A: Yes. Both the S8AL-TP and RS3A-M3/57T use the DO-214AB (SMC) surface mount package. They are mechanically interchangeable from a PCB layout and footprint perspective.

Q: What is the significance of the "Not For New Designs" status on the S8AL-TP?

A: This designation indicates the S8AL-TP has reached end-of-life and is no longer recommended for new product development. Existing inventory may be available, but long-term supply cannot be guaranteed. For new designs, selecting an active product such as the RS3A-M3/57T (if current requirements permit) ensures ongoing availability and compliance with current industry standards.

Q: How do the forward voltage characteristics compare?

A: The S8AL-TP specifies 1.1 V maximum forward voltage at 8A, while the RS3A-M3/57T specifies 1.3 V maximum at 2.5A. These measurements are taken at different current levels, making direct comparison imprecise. At equivalent current levels, the RS3A-M3/57T would exhibit different forward voltage characteristics due to its lower current rating.

Q: What does "Fast Recovery ≤500ns" mean for the RS3A-M3/57T?

A: Recovery time refers to how quickly the diode transitions from conducting to blocking state when reverse bias is applied. The RS3A-M3/57T has a faster recovery time (≤500ns) compared to the S8AL-TP (>500ns). Faster recovery reduces switching losses and is beneficial in high-frequency applications, though it may introduce different EMI characteristics that require circuit evaluation.

Q: Are there compliance or regulatory differences between these parts?

A: Both parts carry REACH Unaffected and EAR99 ECCN classifications. The RS3A-M3/57T includes ROHS3 compliance and MSL Level 1 rating, indicating superior compliance status for modern manufacturing and environmental standards. The S8AL-TP does not specify these certifications.

Q: What is the difference between Bulk and Tape & Reel packaging?

A: Bulk packaging indicates loose components, typically used for inventory or manual assembly. Tape & Reel (TR) packaging provides components on continuous tape for automated pick-and-place assembly. This is a supply format difference and does not affect electrical or mechanical compatibility. Component selection should be based on assembly process requirements.