SA12C-B Equivalent & Substitute Parts

Part Overview

The SA12C-B is a 12V Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc. in DO-204AC (DO-15) axial package configuration. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The SA12C-B provides 20.9V maximum clamping voltage at peak pulse current with 500W peak pulse power rating, suitable for general-purpose transient voltage suppression applications.

Substiute Parts

SA12C-B

Littelfuse Inc.In Stock: 1234SA12C-B Datasheet

Current PartRFQ

SA12CA

Fairchild SemiconductorIn Stock: 6471SA12CA Datasheet

DirectRFQ

SA12CA-B

Littelfuse Inc.In Stock: 2160SA12CA-B Datasheet

DirectRFQ

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-B is determined by the following critical parameters:

• Voltage - Reverse Standoff: 12V (all substitutes match)
• Voltage - Clamping (Max) @ Ipp: 20.9V (main part) vs. 19.9V (all substitutes)
• Current - Peak Pulse (10/1000µs): 25.6A (maintained across all substitutes)
• Power - Peak Pulse: 500W (maintained across all substitutes)
• Package / Case: DO-204AC, DO-15, Axial (all substitutes compatible)
• Mounting Type: Through Hole (all substitutes compatible)
• Type: Zener, Bidirectional Channels: 1 (all substitutes match)

All substitute parts maintain the core electrical specifications within acceptable tolerance ranges for general-purpose TVS diode applications. The clamping voltage differential of 1.0V between the main part (20.9V) and substitutes (19.9V) falls within standard component variation for this device category.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring SA12C-B replacement, the following selection criteria apply based on product status and compliance:

Active Status Substitutes (Preferred for New Designs): SA12CA-B, SA12CA-AP, SA12CA-BP, and SA12CA-TP are all active products with current manufacturing support. SA12CA-B maintains Littelfuse Inc. manufacturer continuity and is available in bulk packaging. SA12CA-TP, SA12CA-AP, and SA12CA-BP are supplied by Micro Commercial Co in active production status with REACH compliance documentation.

Obsolete Status Substitute: SA12CA (Fairchild Semiconductor) is classified as obsolete and should be considered only when active alternatives are unavailable.

Compliance Considerations: All substitute parts maintain ROHS3 compliance where specified. SA12CA-TP, SA12CA-AP, and SA12CA-BP carry REACH Unaffected status. Operating temperature range is consistently specified at -55°C ~ 175°C across active substitutes.

Packaging Variants: SA12CA-B is supplied in bulk packaging. SA12CA-TP is supplied in cut tape (CT) format. SA12CA-AP and SA12CA-BP are supplied in bulk format. Package selection depends on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can SA12CA-B directly replace SA12C-B in existing designs? A: Yes. SA12CA-B maintains identical reverse standoff voltage (12V), peak pulse current (25.6A), and peak pulse power (500W). The clamping voltage is 19.9V versus 20.9V on the original part, representing a 1.0V reduction within acceptable tolerance for general-purpose TVS applications. Both use DO-204AC (DO-15) axial package configuration.

Q: What is the difference between SA12CA-TP, SA12CA-AP, and SA12CA-BP? A: These three parts are electrically identical with matching electrical specifications. The designations indicate packaging format: TP = Cut Tape (CT), AP and BP = Bulk. Selection depends on assembly process requirements and procurement volume.

Q: Why is the clamping voltage different between SA12C-B (20.9V) and the substitutes (19.9V)? A: The 1.0V difference falls within standard component variation for Zener TVS diodes in this voltage class. Both values maintain the 12V reverse standoff specification and provide equivalent transient suppression performance for general-purpose applications.

Q: Are all substitute parts ROHS3 compliant? A: SA12CA-B and SA12CA-TP are explicitly ROHS3 compliant. SA12CA (Fairchild) is ROHS3 compliant. SA12CA-AP and SA12CA-BP do not have RoHS status specified in available documentation but carry REACH Unaffected designation.

Q: Which substitute should be selected for new production designs? A: SA12CA-B (Littelfuse Inc., active status, bulk packaging) or SA12CA-TP (Micro Commercial Co, active status, cut tape packaging) are recommended. Both maintain active product status with current manufacturing support and full compliance documentation.

Q: Is the operating temperature range consistent across all substitutes? A: Operating temperature is specified as -55°C ~ 175°C for SA12C-B, SA12CA-B, SA12CA-AP, and SA12CA-BP. SA12CA-TP specifies -55°C ~ 175°C (TA). SA12CA does not have operating temperature specified. All active substitutes support the full temperature range of the original part.