SMAJ18AHE3_A/I Equivalent & Substitute Parts

Part Overview

The SMAJ18AHE3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is part of the TransZorb® series and is designed for surface mount applications in the DO-214AC (SMA) package. The device provides transient voltage protection with an 18V reverse standoff voltage and 29.2V maximum clamping voltage at peak pulse current. The part maintains active product status and carries automotive-grade qualification under AEC-Q101, making it suitable for demanding industrial and automotive applications requiring reliable overvoltage protection.

Equivalent and substitute parts are identified based on matching electrical performance characteristics and mechanical compatibility, ensuring functional interchangeability within specified operating parameters.

Substiute Parts

SMAJ18AHE3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1213SMAJ18AHE3_A/I Datasheet

Current PartRFQ

SMAJE18AH

Eaton - Electronics DivisionIn Stock: 5680SMAJE18AH Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMAJ18AHE3_A/I are qualified based on strict electrical and mechanical parameter matching. The substitution criteria are:

• Voltage - Reverse Standoff (Typ): 18V
• Voltage - Breakdown (Min): 20V
• Voltage - Clamping (Max) @ Ipp: 29.2V
• Current - Peak Pulse (10/1000µs): 13.7A
• Power - Peak Pulse: 400W
• Operating Temperature Range: -55°C to 150°C (TJ)
• Package / Case: DO-214AC, SMA (Surface Mount)
• Unidirectional Channels: 1
• Type: Zener
• Grade: Automotive
• Qualification: AEC-Q101

The SMAJE18AH from Eaton - Electronics Division meets all specified electrical and mechanical parameters, confirming functional equivalence for direct substitution in circuit applications requiring 18V TVS protection.

Parameter Comparison

Engineering Selection Recommendations

Both the SMAJ18AHE3_A/I and SMAJE18AH maintain active product status and carry identical automotive-grade qualification under AEC-Q101. Both components are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for automotive and industrial applications. The electrical performance characteristics are identical across all critical parameters: reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, and peak pulse power. Both devices operate across the same temperature range (-55°C to 150°C TJ) and are packaged in the DO-214AC (SMA) surface mount configuration. Selection between these parts may be based on availability, supply chain considerations, or application-specific requirements, as both are functionally equivalent for transient voltage suppression in 18V protection circuits.

Frequently Asked Questions (FAQ)

Q: Can SMAJE18AH be used as a direct replacement for SMAJ18AHE3_A/I?

A: Yes. Both parts are unidirectional Zener TVS diodes with identical electrical specifications (18V standoff, 29.2V clamping, 13.7A peak pulse current, 400W peak power), automotive-grade qualification (AEC-Q101), and DO-214AC (SMA) surface mount packaging. They are functionally equivalent for circuit substitution.

Q: Are there any package compatibility concerns?

A: No. Both the SMAJ18AHE3_A/I and SMAJE18AH use the DO-214AC (SMA) package, ensuring mechanical and electrical compatibility on printed circuit boards without layout modifications.

Q: Do both parts meet the same compliance standards?

A: Yes. Both components are ROHS3 compliant, REACH unaffected, and carry AEC-Q101 automotive qualification. They meet identical regulatory and quality requirements.

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

A: Both parts operate across -55°C to 150°C (junction temperature), providing equivalent thermal performance in automotive and industrial environments.

Q: Are there differences in moisture sensitivity?

A: No. Both parts carry Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture-related handling restrictions during storage or assembly.