SMF43A-T13 Equivalent & Substitute Parts

Part Overview

The SMF43A-T13 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This surface-mount component operates with a 43V reverse standoff voltage and provides 69.4V maximum clamping voltage at peak pulse current. The part is Active status and RoHS3 compliant, making it suitable for modern electronic designs requiring transient suppression in the 40V protection range. Substitute parts are identified when electrical parameters and mechanical compatibility align with the original specification, ensuring functional equivalence in circuit protection applications.

Substiute Parts

SMF43A-T13

Littelfuse Inc.In Stock: 766SMF43A-T13 Datasheet

Current PartRFQ

SMF43A-TP

Micro Commercial CoIn Stock: 6234SMF43A-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMF43A-T13 are qualified based on strict electrical and mechanical parameter alignment. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Voltage - Reverse Standoff: 43V (typ)
• Voltage - Breakdown (Min): 47.8V
• Voltage - Clamping (Max) @ Ipp: 69.4V
• Current - Peak Pulse (10/1000µs): 2.9A
• Power - Peak Pulse: 200W
• Package / Case: SOD-123F
• Mounting Type: Surface Mount
• Type: Zener
• Unidirectional Channels: 1

The SMF43A-TP manufactured by Micro Commercial Co meets all critical electrical specifications and mechanical requirements, qualifying it as a direct functional equivalent. Both parts share identical voltage protection characteristics, peak pulse ratings, and SOD-123F package geometry, ensuring pin-compatible circuit board integration.

Parameter Comparison

Engineering Selection Recommendations

Both the SMF43A-T13 and SMF43A-TP are Active status components with RoHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement. Selection between these parts should be based on:

Packaging and Supply Chain Considerations: The SMF43A-T13 is supplied in Tape & Reel (TR) format, while the SMF43A-TP is available in Cut Tape (CT) and Digi-Reel® formats. Choose based on assembly equipment compatibility and procurement volume requirements.

Temperature Operating Range: The SMF43A-TP offers an extended operating temperature range (-65°C to 175°C) compared to the SMF43A-T13 (-55°C to 150°C). Applications requiring operation at temperature extremes should specify the SMF43A-TP.

Inventory and Lead Time: Both parts are in active production with available inventory. The SMF43A-TP currently has higher stock levels (6131 pcs vs 751 pcs), which may influence procurement decisions for high-volume applications.

Frequently Asked Questions (FAQ)

Q: Can SMF43A-TP be used as a direct replacement for SMF43A-T13 in existing designs?

A: Yes. Both parts are electrically identical with matching voltage ratings (43V standoff, 69.4V clamping), peak pulse current (2.9A), and power dissipation (200W). Both use the SOD-123F package with identical pin configuration, enabling direct circuit board substitution without design modification.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape wound on reels, suitable for high-speed automated assembly. Cut Tape (CT) provides components on tape segments, typically used for lower-volume production or manual assembly. Digi-Reel® is a proprietary format offering flexibility between these options. Selection depends on assembly equipment and production volume.

Q: Are there temperature-related limitations when substituting SMF43A-T13 with SMF43A-TP?

A: No functional limitations exist. The SMF43A-TP actually provides a wider operating temperature range (-65°C to 175°C vs -55°C to 150°C), making it suitable for applications requiring extended temperature performance. Both parts maintain identical electrical characteristics across their respective operating ranges.

Q: Do both parts meet the same compliance standards?

A: Yes. Both SMF43A-T13 and SMF43A-TP are RoHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.10.0080. Both carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture-related handling restrictions.

Q: Which part should be selected for new designs?

A: For new designs, either part is acceptable based on supply chain and packaging requirements. The SMF43A-TP offers advantages in extended temperature range and current inventory availability. Verify packaging format compatibility with your assembly process before final selection.