SMCG18C-E3/9AT Equivalent & Substitute Parts

Part Overview

The SMCG18C-E3/9AT is a bidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This surface mount component is designed for general-purpose transient voltage protection applications. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support and procurement.

Substiute Parts

SMCG18C-E3/9AT

Vishay General Semiconductor - Diodes DivisionIn Stock: 1118SMCG18C-E3/9AT Datasheet

Current PartRFQ

SMCG18CA-E3/9AT

Vishay General Semiconductor - Diodes DivisionIn Stock: 946SMCG18CA-E3/9AT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMCG18C-E3/9AT is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 18V
• Voltage - Breakdown (Min): 20V
• Bidirectional Channels: 1
• Mounting Type: Surface Mount
• Package / Case: DO-215AB, SMC Gull Wing
• Operating Temperature Range: -55°C to 150°C (TJ)

The SMCG18CA-E3/9AT qualifies as a direct substitute based on matching all critical parameters. While the clamping voltage and peak pulse current differ slightly (29.2V and 51.4A respectively versus 32.2V and 46.6A), these variations remain within the functional tolerance for the same voltage class and package specification. The substitute maintains identical standoff voltage, breakdown voltage, temperature range, and physical package configuration.

Parameter Comparison

Engineering Selection Recommendations

The SMCG18CA-E3/9AT is the primary substitute for the obsolete SMCG18C-E3/9AT. Selection of this substitute is supported by the following factors:

• Both components are manufactured by Vishay General Semiconductor - Diodes Division within the same TransZorb® series
• The substitute maintains active product status, ensuring long-term availability and supply chain continuity
• Electrical specifications align across all critical parameters: identical standoff voltage (18V), breakdown voltage (20V), temperature range (-55°C to 150°C), and power rating (1500W)
• Physical package configuration is identical (DO-215AB, SMC Gull Wing), enabling direct PCB layout compatibility
• Both components meet ROHS3 compliance and carry MSL 1 rating
• The substitute exhibits improved peak pulse current capability (51.4A versus 46.6A) and lower clamping voltage (29.2V versus 32.2V), providing enhanced performance characteristics within the same voltage class

Frequently Asked Questions (FAQ)

Q: Can the SMCG18CA-E3/9AT be used as a direct replacement for the SMCG18C-E3/9AT?

A: Yes. Both components share identical voltage ratings (18V standoff, 20V breakdown), temperature range, power dissipation, and physical package (DO-215AB). The substitute is electrically and mechanically compatible for applications requiring 18V class TVS protection.

Q: What is the significance of the different clamping voltages (32.2V vs. 29.2V)?

A: Both values fall within the acceptable clamping range for 18V class TVS diodes. The lower clamping voltage of the substitute (29.2V) provides marginally improved transient suppression performance while maintaining the same peak pulse current capability and power rating.

Q: Why is the original part marked as obsolete?

A: Product obsolescence reflects Vishay's discontinuation of the SMCG18C-E3/9AT line. The SMCG18CA-E3/9AT represents the active continuation within the same voltage class and package family, ensuring design continuity and supply availability.

Q: Are there packaging differences between these parts?

A: The main part (SMCG18C-E3/9AT) is supplied in standard packaging, while the substitute (SMCG18CA-E3/9AT) is available in Tape & Reel (TR) format. Both use identical DO-215AB physical packages suitable for surface mount assembly.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SMCG18C-E3/9AT and SMCG18CA-E3/9AT are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity) ratings, meeting identical regulatory and environmental requirements.