SMBG18A-E3/5B Equivalent & Substitute Parts

Part Overview

The SMBG18A-E3/5B is an active Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This unidirectional zener diode is designed for general-purpose transient voltage suppression applications in surface-mount configurations. The part operates across a temperature range of -55°C to 150°C and is RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter range.

Substiute Parts

SMBG18A-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 680SMBG18A-E3/5B Datasheet

Current PartRFQ

SMBJ18A-TR

STMicroelectronicsIn Stock: 6238SMBJ18A-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for TVS diodes is determined by matching the following critical electrical parameters: reverse standoff voltage (18V), breakdown voltage minimum (20V), clamping voltage maximum at peak pulse current (29.2V), peak pulse current rating (≥20.5A), and peak pulse power dissipation (600W). Mechanical compatibility requires surface-mount packaging in either DO-215AA (SMB Gull Wing) or DO-214AA (SMB) configurations. All substitute candidates must maintain RoHS3 compliance and operate within the specified temperature range of -55°C to 150°C.

The SMBJ18A-TR qualifies as a direct substitute based on identical electrical specifications and compatible surface-mount packaging, with peak pulse current of 21.5A exceeding the minimum requirement.

Parameter Comparison

Engineering Selection Recommendations

Both the SMBG18A-E3/5B and SMBJ18A-TR maintain active product status with full RoHS3 compliance and REACH unaffected designation. The SMBJ18A-TR provides equivalent electrical performance with a 1A higher peak pulse current rating (21.5A versus 20.5A), offering additional margin in transient suppression applications. Package compatibility exists between DO-215AA (SMB Gull Wing) and DO-214AA (SMB) configurations, both suitable for standard surface-mount assembly processes. Selection between these parts should be based on PCB layout constraints, available inventory, and specific package footprint requirements for the target application.

Frequently Asked Questions (FAQ)

Q: Can SMBJ18A-TR replace SMBG18A-E3/5B in existing designs? A: Yes. Both parts share identical voltage specifications (18V standoff, 20V breakdown, 29.2V clamping) and power ratings (600W peak pulse). The SMBJ18A-TR provides higher peak pulse current (21.5A vs 20.5A), ensuring compatibility. Package differences (DO-214AA vs DO-215AA) are both SMB configurations suitable for standard surface-mount assembly.

Q: What are the key electrical parameters that must match for TVS diode substitution? A: Critical matching parameters are reverse standoff voltage, breakdown voltage minimum, clamping voltage maximum at peak pulse current, peak pulse current rating, and peak pulse power dissipation. All must remain within or exceed the original specification.

Q: Are there packaging considerations when switching between these parts? A: Both parts use SMB surface-mount packages (DO-214AA and DO-215AA). Footprint compatibility should be verified with the PCB layout, as minor dimensional differences may exist between gull wing and standard SMB configurations.

Q: Do both parts meet the same compliance standards? A: Yes. Both SMBG18A-E3/5B and SMBJ18A-TR are RoHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS codes (8541.10.0080).

Q: What is the operating temperature range for these TVS diodes? A: Both parts operate across -55°C to 150°C junction temperature, suitable for industrial and commercial applications.