SMF18CA Equivalent & Substitute Parts

Part Overview

The SMF18CA is an active Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This bidirectional Zener diode operates with an 18V reverse standoff voltage and provides 200W peak pulse power dissipation in a compact SOD-123F package. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating, making it suitable for standard industrial and commercial circuit protection requirements.

Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity while maintaining identical electrical performance and mechanical compatibility.

Substiute Parts

SMF18CA

Littelfuse Inc.In Stock: 1505SMF18CA Datasheet

Current PartRFQ

SMFE18CA

Eaton - Electronics DivisionIn Stock: 3757SMFE18CA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMF18CA are qualified based on strict electrical and mechanical parameter matching within the TVS diode category. The substitution criteria are:

• Voltage - Reverse Standoff (Typ): 18V
• Voltage - Breakdown (Min): 20V
• Voltage - Clamping (Max) @ Ipp: 29.2V
• Current - Peak Pulse (10/1000µs): 6.8A
• Power - Peak Pulse: 200W
• Package / Case: SOD-123F
• Mounting Type: Surface Mount
• Bidirectional Channels: 1
• Type: Zener

Parts meeting all these parameters are electrically and mechanically interchangeable. The SMFE18CA from Eaton - Electronics Division satisfies all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the SMF18CA and SMFE18CA are active production parts with full regulatory compliance. The SMF18CA (Littelfuse) offers an extended lower operating temperature limit of -65°C compared to the SMFE18CA (Eaton) at -55°C. For applications requiring operation below -55°C, the SMF18CA is the appropriate selection. For standard industrial temperature ranges, both parts are functionally equivalent.

Both parts maintain RoHS compliance and REACH unaffected status, with identical moisture sensitivity ratings and export classifications. Selection between these parts should be based on supply availability, procurement lead times, and application-specific temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can SMFE18CA replace SMF18CA in all applications?

A: SMFE18CA is electrically and mechanically equivalent to SMF18CA for applications operating within the -55°C to 150°C temperature range. Applications requiring operation below -55°C must use SMF18CA due to its extended lower temperature specification of -65°C.

Q: Are the package dimensions identical between SMF18CA and SMFE18CA?

A: Both parts use the SOD-123F package with identical mechanical specifications, ensuring direct PCB footprint compatibility and surface-mount assembly compatibility.

Q: Do both parts meet the same regulatory requirements?

A: Both SMF18CA and SMFE18CA are RoHS compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS codes. Both maintain MSL 1 (Unlimited) moisture sensitivity ratings.

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution eligibility is determined by matching voltage ratings (18V reverse standoff, 20V breakdown minimum, 29.2V clamping maximum), current rating (6.8A peak pulse), power dissipation (200W peak pulse), and package type (SOD-123F). All these parameters are identical between SMF18CA and SMFE18CA.

Q: Are there inventory considerations when selecting between these parts?

A: Current inventory levels may differ between suppliers. SMF18CA shows 1,399 pieces in stock, while SMFE18CA shows 3,661 pieces in stock. Procurement decisions should account for lead times and supply chain requirements.