SMAJ8.0A Equivalent & Substitute Parts

Part Overview

The SMAJ8.0A is an active-status transient voltage suppressor (TVS) diode manufactured by Taiwan Semiconductor Corporation. This unidirectional zener diode is designed for general-purpose transient voltage suppression applications in surface-mount configurations. The device features an 8V reverse standoff voltage with a 13.6V maximum clamping voltage and 29.4A peak pulse current capability. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring identical electrical and mechanical specifications.

Substiute Parts

SMAJ8.0A

Taiwan Semiconductor CorporationIn Stock: 15708SMAJ8.0A Datasheet

Current PartRFQ

SMAJ8.0A

MeritekIn Stock: 15638SMAJ8.0A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMAJ8.0A are identified based on strict equivalence across all critical electrical and mechanical parameters. The substitution criteria are:

Electrical Parameters (Must Match):

• Voltage - Reverse Standoff (Typ): 8V
• Voltage - Breakdown (Min): 8.89V
• Voltage - Clamping (Max) @ Ipp: 13.6V
• Current - Peak Pulse (10/1000µs): 29.4A (tolerance ±0.01A acceptable)
• Power - Peak Pulse: 400W
• Operating Temperature Range: -55°C to 150°C

Mechanical Parameters (Must Match):

• Package / Case: DO-214AC (SMA)
• Mounting Type: Surface Mount
• Unidirectional Channels: 1
• Type: Zener

Compliance Parameters (Must Match):

• RoHS Status: ROHS3 Compliant
• REACH Status: REACH Unaffected
• Product Status: Active

Parts meeting all criteria are classified as direct substitutes. No parameter deviation is permitted for functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: SMAJ8.0A (Taiwan Semiconductor Corporation)

The Taiwan Semiconductor Corporation SMAJ8.0A is the original manufacturer part with confirmed active product status and full compliance certifications. This part is recommended as the primary selection for new designs and standard procurement.

Equivalent Substitute: SMAJ8.0A (Meritek)

The Meritek SMAJ8.0A meets all electrical, mechanical, and compliance requirements for direct substitution. The peak pulse current specification of 29.41A is equivalent to the 29.4A specification of the primary part, representing a negligible variance within acceptable engineering tolerances. This part is suitable for use in applications where the Taiwan Semiconductor part is unavailable. Both parts maintain identical RoHS3 compliance, REACH unaffected status, and MSL rating of 1 (Unlimited).

Selection between these parts is determined by availability, lead time, and procurement requirements. No functional or reliability differences exist between the two manufacturers for this part number.

Frequently Asked Questions (FAQ)

Q: Can the Meritek SMAJ8.0A be used as a direct replacement for the Taiwan Semiconductor SMAJ8.0A?

A: Yes. The Meritek SMAJ8.0A is electrically and mechanically equivalent. All critical parameters including voltage ratings, current ratings, temperature range, and package type are identical. Both parts are active-status products with ROHS3 compliance and MSL 1 rating.

Q: What is the significance of the 29.41A versus 29.4A peak pulse current specification?

A: The 0.01A difference represents a variance of 0.034% and is within standard manufacturing tolerances for TVS diodes. Both specifications meet the same application requirements and are functionally equivalent.

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

A: No. Both parts use the DO-214AC (SMA) package and are configured for surface-mount assembly. Pin configuration, footprint, and soldering requirements are identical.

Q: What compliance certifications apply to both parts?

A: Both parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Both carry MSL rating 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. The electrical and mechanical specifications are identical, and both parts maintain the same compliance status. No design modifications or re-qualification are required when substituting between these parts.

Q: What is the operating temperature range for both parts?

A: Both parts operate across -55°C to 150°C junction temperature (TJ), providing identical thermal performance across the full specified range.