SLD12-018-B Equivalent & Substitute Parts

Part Overview

The SLD12-018-B is a bidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc. in the P600 axial package. This component provides transient overvoltage protection with a 12V reverse standoff voltage and 19.9V maximum clamping voltage at peak pulse current of 256.3A. The part is actively produced and carries AEC-Q101 automotive qualification with ROHS3 compliance.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the critical protection parameters while accommodating different packaging formats or manufacturer sources.

Substiute Parts

SLD12-018-B

Littelfuse Inc.In Stock: 1002SLD12-018-B Datasheet

Current PartRFQ

5KP12CA

Littelfuse Inc.In Stock: 64385KP12CA Datasheet

MFR RecommendedRFQ

SA12CA

Fairchild SemiconductorIn Stock: 6471SA12CA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for TVS diodes is determined by matching the following critical parameters:

• Voltage - Reverse Standoff (Typ): 12V
• Voltage - Clamping (Max) @ Ipp: 19.9V
• Bidirectional Channels: 1
• Type: Zener
• Mounting Type: Through Hole
• RoHS Status: ROHS3 Compliant

The 5KP12CA maintains full electrical equivalence with identical standoff voltage, clamping voltage, peak pulse current, and power dissipation in the same P600 package. The primary difference is packaging format (Cut Tape vs. Bulk) and active product status.

The SA12CA shares the same voltage parameters and bidirectional Zener topology but operates at reduced peak pulse current (25.1A vs. 256.3A) and lower power dissipation (500W vs. 5000W) in a different package format (DO-15). This part is obsolete and represents a lower-performance alternative suitable only for applications with reduced transient energy requirements.

Parameter Comparison

Engineering Selection Recommendations

The 5KP12CA is the primary equivalent substitute for the SLD12-018-B. Both parts are manufactured by Littelfuse Inc., maintain active product status, and deliver identical electrical performance across all critical protection parameters. The 5KP12CA is available in higher inventory quantities and is supplied in Cut Tape packaging, which may align with automated assembly processes. Both parts carry ROHS3 compliance and are suitable for the same applications.

The SA12CA is not recommended as a direct substitute due to obsolete product status and significantly reduced peak pulse current and power dissipation ratings. This part is suitable only for legacy designs or applications with substantially lower transient energy requirements than the original specification.

Frequently Asked Questions (FAQ)

Q: Can the 5KP12CA be used as a direct replacement for the SLD12-018-B?

A: Yes. Both parts share identical voltage ratings (12V standoff, 19.9V clamping), peak pulse current (256.3A), power dissipation (5000W), and package format (P600 axial). The primary difference is packaging format (Cut Tape vs. Bulk) and inventory source. Both are active products from the same manufacturer.

Q: Why is the SA12CA listed as a substitute if it has lower current and power ratings?

A: The SA12CA meets the voltage protection criteria (12V standoff, 19.9V clamping) but operates at reduced transient energy capacity. It is listed as a historical substitute reference only. Selection of this part requires confirmation that application transient energy does not exceed 500W peak pulse power.

Q: Are there package compatibility concerns between these parts?

A: The SLD12-018-B and 5KP12CA use identical P600 axial packages and are mechanically interchangeable. The SA12CA uses a DO-15 package, which has different physical dimensions and pin spacing, requiring PCB layout modification.

Q: What compliance certifications apply to these parts?

A: All three parts carry ROHS3 compliance. The SLD12-018-B and 5KP12CA hold AEC-Q101 automotive qualification. The SA12CA is obsolete and no longer supported by the manufacturer.

Q: How do packaging formats affect part selection?

A: The SLD12-018-B is supplied in Bulk packaging, while the 5KP12CA is supplied in Cut Tape format. Cut Tape packaging is optimized for automated pick-and-place assembly. Bulk packaging is suitable for manual assembly or reel-fed processes. Electrical performance is identical.