SA12A-TP Equivalent & Substitute Parts

Part Overview

The SA12A-TP is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection applications. It features a 12V reverse standoff voltage with a 19.9V maximum clamping voltage and 25.6A peak pulse current capability in a through-hole DO-15 package. The part is currently active in production and ROHS3 compliant.

Substitute parts become necessary when the SA12A-TP experiences supply constraints, extended lead times, or when alternative manufacturers' inventory is more readily available. Equivalent parts must maintain identical electrical performance within the specified parameter ranges and compatible mechanical packaging.

Substiute Parts

SA12A-TP

Micro Commercial CoIn Stock: 930SA12A-TP Datasheet

Current PartRFQ

SA12A

Fairchild SemiconductorIn Stock: 2436SA12A Datasheet

DirectRFQ

SA12A-B

Littelfuse Inc.In Stock: 1707SA12A-B Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA12A-TP are qualified based on the following electrical and mechanical criteria:

Critical Parameters for Substitution:

• Voltage - Reverse Standoff: 12V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 19.9V (exact match required)
• Current - Peak Pulse (10/1000µs): 25.6A minimum (equal or greater acceptable)
• Power - Peak Pulse: 500W (equal or greater acceptable)
• Mounting Type: Through Hole (required)
• Package / Case: DO-204AC or DO-15 (compatible axial packages)
• Type: Zener, Unidirectional (1 channel)

Substitute Classification:

Direct Equivalent (SA12A): Fairchild Semiconductor part maintains identical voltage specifications and peak pulse power rating. Peak pulse current is 25.1A, which is within acceptable tolerance for general-purpose applications. Packaging is bulk format. Product status is obsolete.

Similar Equivalent (SA12A-B): Littelfuse Inc. part maintains all critical electrical parameters with peak pulse current of 25.6A (matching the original specification). Supplier device package is DO-204AC (DO-15), confirming mechanical compatibility. Product status is active. Packaging is bulk format.

Parameter Comparison

Engineering Selection Recommendations

SA12A-TP (Primary Selection): Recommended for new designs and applications requiring active product status with guaranteed long-term availability. Supplied in tape and reel packaging suitable for automated assembly processes. ROHS3 compliant and REACH unaffected.

SA12A-B (Littelfuse Inc.): Preferred substitute when SA12A-TP availability is constrained. Maintains active product status with identical electrical specifications and operating temperature range. ROHS3 compliant and REACH unaffected. Bulk packaging format requires manual handling. Directly compatible in through-hole applications.

SA12A (Fairchild Semiconductor): Acceptable substitute for existing inventory management or legacy system maintenance. Product status is obsolete, indicating no new production. Peak pulse current specification of 25.1A is marginally lower than the original 25.6A but remains within acceptable tolerance for general-purpose protection circuits. ROHS3 compliant. Use only when SA12A-TP and SA12A-B are unavailable.

Frequently Asked Questions (FAQ)

Q: Can SA12A-B be used as a direct replacement for SA12A-TP in production assembly?

A: Yes. SA12A-B maintains identical voltage specifications (12V standoff, 19.9V clamping), matching peak pulse current (25.6A), and compatible through-hole DO-15 packaging. The primary difference is packaging format (bulk vs. tape & reel) and supplier. Both are ROHS3 compliant and suitable for automated or manual assembly.

Q: What is the difference between SA12A and SA12A-B?

A: Both parts share the same electrical specifications for voltage parameters. SA12A (Fairchild) has a peak pulse current of 25.1A versus SA12A-B (Littelfuse) at 25.6A. SA12A-B is the preferred substitute due to active product status and exact current matching. SA12A is obsolete and should be used only when other options are unavailable.

Q: Are there any package compatibility issues between these parts?

A: No. All three parts use compatible through-hole axial packages (DO-204AC/DO-15). Physical dimensions and lead spacing are identical, allowing direct PCB footprint compatibility without layout modifications.

Q: Does operating temperature range affect substitution eligibility?

A: SA12A-TP and SA12A-B both specify -55°C to 175°C operating temperature range. SA12A does not provide operating temperature specifications in available documentation. For applications requiring full temperature range operation, SA12A-B is the recommended substitute.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SA12A-TP, SA12A, and SA12A-B are all ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active status indicates ongoing production and long-term availability. Obsolete status indicates discontinued production with no guarantee of future supply. For new designs, select active parts (SA12A-TP or SA12A-B). Obsolete parts (SA12A) are suitable only for maintenance or legacy system support.