SMBG45HE3/52 Equivalent & Substitute Parts

Part Overview

The SMBG45HE3/52 is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This surface mount component is designed for transient overvoltage protection in automotive-grade applications. The device features a 45V reverse standoff voltage with an 80.3V maximum clamping voltage and 7.5A peak pulse current capability in a DO-215AA (SMB) package.

The SMBG45HE3/52 is currently listed as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

SMBG45HE3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 1128SMBG45HE3/52 Datasheet

Current PartRFQ

SMBG45AHE3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 903SMBG45AHE3/52 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMBG45HE3/52 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 45V
• Voltage - Breakdown (Min): 50V
• Package / Case: DO-215AA, SMB Gull Wing
• Mounting Type: Surface Mount
• Grade: Automotive
• Qualification: AEC-Q101

The SMBG45AHE3/52 qualifies as a direct substitute because it maintains identical reverse standoff voltage, breakdown voltage, package configuration, automotive grade, and AEC-Q101 qualification. Variations in clamping voltage and peak pulse current remain within acceptable design margins for this product category when the core voltage and package specifications are preserved.

Parameter Comparison

Engineering Selection Recommendations

The SMBG45AHE3/52 is the qualified substitute for the obsolete SMBG45HE3/52. Both components share identical automotive grade classification and AEC-Q101 qualification, ensuring compliance with automotive reliability standards. The substitute maintains the same reverse standoff voltage (45V), breakdown voltage (50V), and package configuration (DO-215AA, SMB Gull Wing).

The SMBG45AHE3/52 is currently in active production status, providing assured long-term availability compared to the obsolete main part. The substitute exhibits a lower maximum clamping voltage (72.7V versus 80.3V) and higher peak pulse current capability (8.3A versus 7.5A), both within the same 600W peak pulse power rating. These parameter variations are consistent with manufacturing tolerances within the TransZorb® series and do not compromise functional equivalence for applications designed around the 45V standoff specification.

Frequently Asked Questions (FAQ)

Q: Can SMBG45AHE3/52 be used as a direct replacement for SMBG45HE3/52 in existing designs?

A: Yes. Both parts maintain identical reverse standoff voltage (45V), breakdown voltage (50V), automotive grade, AEC-Q101 qualification, and DO-215AA package configuration. The substitute is electrically and mechanically compatible for direct board-level substitution.

Q: What is the significance of the difference in clamping voltage between the two parts?

A: The SMBG45HE3/52 specifies a maximum clamping voltage of 80.3V, while the SMBG45AHE3/52 specifies 72.7V. Both values are within the design envelope for 45V standoff TVS diodes and reflect normal manufacturing variation within the TransZorb® series. Circuit designs based on the 45V standoff specification accommodate this range.

Q: Are there packaging differences between these parts?

A: No. Both parts use the DO-215AA (SMB Gull Wing) surface mount package with identical footprint and mounting characteristics. The SMBG45AHE3/52 is supplied in Tape & Reel (TR) packaging, which is standard for production quantities.

Q: Why is the main part listed as obsolete?

A: The SMBG45HE3/52 has been discontinued by the manufacturer. The SMBG45AHE3/52 remains in active production and serves as the current equivalent for new designs and component replenishment.

Q: Do both parts meet the same compliance standards?

A: Yes. Both components are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 and HTSUS 8541.10.0080. Both carry MSL 1 (Unlimited) moisture sensitivity rating.