SM8S43AH Equivalent & Substitute Parts

Part Overview

The SM8S43AH is an active Transient Voltage Suppressor (TVS) diode manufactured by Eaton - Electronics Division. This unidirectional zener device is designed for transient voltage protection in telecom applications, featuring a 43V reverse standoff voltage and 69.4V maximum clamping voltage. The component is housed in a DO-218AB surface mount package and meets AEC-Q101 automotive qualification standards. Substitute parts are identified to provide alternative sourcing options when the primary part number is unavailable or when inventory requirements necessitate alternative suppliers.

Substiute Parts

SM8S43AH

Eaton - Electronics DivisionIn Stock: 1366SM8S43AH Datasheet

Current PartRFQ

SM8S43A-Q

Bourns Inc.In Stock: 3780SM8S43A-Q Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SM8S43AH is permissible with the SM8S43A-Q based on electrical and mechanical parameter equivalence. Both parts maintain identical specifications across all critical protection parameters: 43V reverse standoff voltage, 47.8V minimum breakdown voltage, 69.4V maximum clamping voltage, and 95A peak pulse current (within 0.1A tolerance). Both components operate across the full temperature range of -55°C to 175°C and are housed in DO-218AB surface mount packages. Both parts carry AEC-Q101 automotive qualification and Moisture Sensitivity Level 1 (Unlimited). The substitution is valid based on matching electrical performance characteristics and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the SM8S43AH and SM8S43A-Q are active products with identical electrical performance specifications and mechanical compatibility. Selection between these parts is based on availability and supply chain requirements rather than technical differentiation. Both components meet AEC-Q101 automotive qualification standards and carry REACH Unaffected status, confirming compliance with regulatory requirements. The SM8S43A-Q carries explicit RoHS3 Compliance designation, while the SM8S43AH does not specify RoHS status in the provided data. For applications requiring documented RoHS3 compliance, the SM8S43A-Q is the appropriate selection. For general transient voltage suppression in telecom and automotive applications, either part satisfies the specified electrical and thermal requirements.

Frequently Asked Questions (FAQ)

Q: Can the SM8S43A-Q directly replace the SM8S43AH in existing designs?

A: Yes. Both parts are electrically and mechanically equivalent. The SM8S43A-Q operates at identical voltage levels (43V standoff, 69.4V clamping), peak pulse current (95A), and temperature range (-55°C to 175°C). Both are housed in DO-218AB surface mount packages with identical pinout and footprint compatibility.

Q: What is the difference in peak pulse current between these parts?

A: The SM8S43AH specifies 95.1A peak pulse current, while the SM8S43A-Q specifies 95A. This 0.1A difference is within normal manufacturing tolerance and does not affect circuit performance or protection characteristics.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the SM8S43AH and SM8S43A-Q carry Automotive grade designation and AEC-Q101 qualification, confirming suitability for automotive transient voltage suppression applications.

Q: Does the SM8S43A-Q offer any compliance advantages?

A: The SM8S43A-Q explicitly states RoHS3 Compliance status. If RoHS3 documentation is required for your application, the SM8S43A-Q provides this certification. Both parts are REACH Unaffected and carry EAR99 ECCN classification.

Q: Are there any package or mounting differences between these parts?

A: No. Both parts use identical DO-218AB surface mount packages with the same physical dimensions, pinout, and PCB footprint. No layout or assembly modifications are required when substituting between these parts.

Q: What is the moisture sensitivity level for both parts?

A: Both parts carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions during storage, handling, or assembly processes.