CR3403AB Equivalent & Substitute Parts

Part Overview

The CR3403AB is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage clamping applications in a 3-SIP through-hole package. This component features a 300V reverse standoff voltage rating and operates across an extended temperature range of -55°C to 175°C. The CR3403AB is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

CR3403AB

Littelfuse Inc.In Stock: 896CR3403AB Datasheet

Current PartRFQ

P3403ABL

Littelfuse Inc.In Stock: 5390P3403ABL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CR3403AB is determined by the following critical parameters:

• Voltage Rating Compatibility: Reverse standoff voltage of 300V and breakdown voltage minimum of 400V
• Channel Configuration: 3-channel bidirectional configuration for multi-line protection
• Package Compatibility: 3-SIP through-hole form factor with TO-220 Modified supplier package
• Thermal Range: Operating temperature range of -55°C to 175°C
• Functional Category: Transient voltage suppression for general-purpose applications

The P3403ABL qualifies as a manufacturer-recommended substitute based on matching voltage specifications, channel count, package geometry, and thermal operating range. While the P3403ABL represents a different device technology (TVS Thyristor vs. Zener diode), it provides equivalent voltage protection functionality within the specified electrical parameters.

Parameter Comparison

Engineering Selection Recommendations

The P3403ABL is the manufacturer-recommended substitute for the obsolete CR3403AB. Selection of the P3403ABL provides the following advantages:

• Product Availability: Active product status ensures continued supply and manufacturing support
• Regulatory Compliance: ROHS3 compliance status meets current environmental and safety standards, whereas the CR3403AB is RoHS non-compliant
• Electrical Equivalence: Matching voltage ratings (300V standoff, 400V breakover) and 3-channel configuration maintain functional compatibility
• Package Compatibility: Identical 3-SIP TO-220 Modified package enables direct board-level substitution
• Manufacturer Support: Both components are from Littelfuse Inc., ensuring consistent design and quality standards

The transition from the CR3403AB to the P3403ABL does not require circuit redesign when voltage and current requirements remain within the specified parameters.

Frequently Asked Questions (FAQ)

Q: Can the P3403ABL be used as a direct replacement for CR3403AB on existing PCBs?

A: Yes. The P3403ABL matches the CR3403AB in voltage rating (300V standoff), channel count (3), and package geometry (3-SIP TO-220 Modified). Direct board-level substitution is possible without layout modifications.

Q: What is the primary reason for substituting the CR3403AB?

A: The CR3403AB is classified as obsolete. The P3403ABL is the active, manufacturer-recommended alternative that maintains electrical equivalence while providing improved product availability and regulatory compliance.

Q: Are there differences in operating temperature range between these parts?

A: The CR3403AB operates from -55°C to 175°C. Operating temperature specifications for the P3403ABL are not provided in the available data; however, both components are designed for general-purpose transient voltage suppression applications.

Q: Does the P3403ABL require any circuit modifications?

A: No circuit modifications are required. The P3403ABL maintains the same voltage protection characteristics and package footprint as the CR3403AB. Existing circuit designs remain valid.

Q: What is the difference between the CR3403AB (Zener) and P3403ABL (Thyristor) technologies?

A: Both devices provide transient voltage suppression at the specified 300V standoff voltage. The P3403ABL uses thyristor technology (SIDACtor®) while the CR3403AB uses Zener technology. Both achieve equivalent voltage clamping performance for the specified application.

Q: Is the P3403ABL RoHS compliant?

A: Yes. The P3403ABL is ROHS3 compliant, whereas the CR3403AB is RoHS non-compliant. This represents an improvement in regulatory compliance for new designs and manufacturing environments.