SA12C Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA12C is a 12V Zener transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole component features a 20.9V maximum clamping voltage and 25.6A peak pulse current capability in a DO-204AC (DO-15) axial package. The SA12C is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SA12C

Littelfuse Inc.In Stock: 1264SA12C Datasheet

Current PartRFQ

SA12CA

Fairchild SemiconductorIn Stock: 6471SA12CA Datasheet

DirectRFQ

SA12CA-B

Littelfuse Inc.In Stock: 2160SA12CA-B Datasheet

MFR RecommendedRFQ

SA12CA-AP

Micro Commercial CoIn Stock: 981SA12CA-AP Datasheet

MFR RecommendedRFQ

SA12CA-BP

Micro Commercial CoIn Stock: 976SA12CA-BP Datasheet

MFR RecommendedRFQ

SA12CA-TP

Micro Commercial CoIn Stock: 1447SA12CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA12C is determined by electrical and mechanical parameter compatibility within the TVS diode category. The following criteria establish valid substitutes:

Critical Electrical Parameters:

• Reverse standoff voltage: 12V (identical)
• Clamping voltage range: 19.9V to 20.9V (acceptable variation)
• Peak pulse current: 25.1A to 25.6A (acceptable variation)
• Peak pulse power: 500W (identical)
• Bidirectional channels: 1 (identical)
• Diode type: Zener (identical)

Mechanical & Packaging Requirements:

• Package/Case: DO-204AC, DO-15, or Axial equivalent
• Mounting type: Through Hole (identical)
• Operating temperature range: -55°C to 175°C or equivalent

Compliance Requirements:

• RoHS3 compliance maintained
• ECCN: EAR99 (identical)
• HTSUS: 8541.10.0080 (identical)

All substitute parts listed maintain these parameters within acceptable engineering tolerances for direct circuit substitution.

Parameter Comparison

Engineering Selection Recommendations

Active Product Status Priority: SA12CA-B, SA12CA-AP, SA12CA-BP, and SA12CA-TP are classified as active products, providing long-term availability and manufacturing support compared to the obsolete SA12C and SA12CA.

Manufacturer Considerations: Littelfuse Inc. (SA12CA-B) maintains the original manufacturer lineage, offering design continuity. Micro Commercial Co variants (SA12CA-AP, SA12CA-BP, SA12CA-TP) provide alternative sourcing with identical electrical specifications.

Compliance & Certifications: All substitute parts maintain ROHS3 compliance and EAR99 export classification. SA12CA-B, SA12CA-TP, and SA12CA-TP explicitly confirm ROHS3 status and moisture sensitivity level (MSL 1 - Unlimited).

Packaging & Procurement Format:

• SA12CA-B: Bulk packaging for high-volume applications
• SA12CA-AP, SA12CA-BP: Bulk packaging for standard procurement
• SA12CA-TP: Cut Tape (CT) format for automated assembly processes

Electrical Performance: All substitutes operate within acceptable parameter ranges. The clamping voltage reduction from 20.9V (SA12C) to 19.9V (all substitutes) represents improved protection margin. Peak pulse current specifications (25.1A to 25.6A) remain within functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can SA12CA-B directly replace SA12C in existing designs? A: Yes. SA12CA-B maintains identical reverse standoff voltage (12V), peak pulse power (500W), and through-hole DO-204AC packaging. The clamping voltage reduction to 19.9V provides tighter overvoltage protection. Active product status ensures continued availability.

Q: What is the difference between SA12CA-AP, SA12CA-BP, and SA12CA-TP? A: These Micro Commercial Co variants share identical electrical specifications (12V standoff, 19.9V clamping, 25.6A peak current). The primary difference is packaging format: SA12CA-AP and SA12CA-BP are supplied in bulk, while SA12CA-TP is supplied in cut tape format for automated pick-and-place assembly.

Q: Why does SA12CA show different peak pulse current (25.1A vs 25.6A)? A: SA12CA from Fairchild Semiconductor specifies 25.1A peak pulse current, which remains within acceptable substitution tolerance for general-purpose TVS applications. All other electrical parameters align with SA12C requirements.

Q: Is operating temperature range critical for substitution? A: The SA12C specifies -55°C to 175°C (TJ). All active substitute parts (SA12CA-B, SA12CA-AP, SA12CA-BP, SA12CA-TP) maintain this temperature range. SA12CA does not specify operating temperature but shares identical package and electrical characteristics.

Q: Can I use SA12CA-TP in manual assembly applications? A: SA12CA-TP is supplied in cut tape format, optimized for automated assembly. Manual assembly is possible but less efficient than bulk or standard packaging formats. SA12CA-B or SA12CA-AP bulk packaging is more suitable for manual assembly workflows.

Q: Are all substitutes RoHS3 compliant? A: SA12CA-B, SA12CA-TP, and SA12CA explicitly confirm ROHS3 compliance. SA12CA-AP and SA12CA-BP do not specify RoHS status in provided data but share identical base specifications with confirmed compliant variants.

Q: What is the inventory status for these substitutes? A: SA12CA-B (2,099 pcs), SA12CA-AP (915 pcs), SA12CA-BP (931 pcs), and SA12CA-TP (1,361 pcs) are available as new original stock. SA12CA (6,400 pcs) is also available despite obsolete status.