SMBJ3V3HE3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ3V3HE3_A/I is a unidirectional transient voltage suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, designed for surface mount applications in the DO-214AA (SMB) package. This component provides transient overvoltage protection with a 3.3V reverse standoff voltage and 10.3V maximum clamping voltage at peak pulse current. The part is classified as obsolete, making identification of active equivalent alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

SMBJ3V3HE3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1232SMBJ3V3HE3_A/I Datasheet

Current PartRFQ

SMBJ3V3HE3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 944SMBJ3V3HE3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ3V3HE3_A/I is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff: 3.3V (identical)
• Voltage - Breakdown (Min): 4.1V (identical)
• Package / Case: DO-214AA, SMB (identical)
• Mounting Type: Surface Mount (identical)
• Series: TransZorb® (identical manufacturer series)
• Type: Zener, Unidirectional (identical)
• Grade: Automotive (identical)
• Qualification: AEC-Q101 (identical)
• Operating Temperature Range: -65°C ~ 175°C (identical)

The SMBJ3V3HE3_B/I qualifies as a direct substitute based on these core electrical and mechanical parameters. Differences in peak pulse current rating (50A vs. 200A) and clamping voltage (7.3V vs. 10.3V) represent performance variations within the same product family and do not preclude substitution when application requirements permit.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ3V3HE3_B/I is the active equivalent for the obsolete SMBJ3V3HE3_A/I. Both parts maintain identical voltage ratings, package specifications, and automotive-grade qualifications (AEC-Q101). The SMBJ3V3HE3_B/I is currently in active production status, ensuring long-term availability and supply chain continuity.

Selection between these parts depends on application-specific transient current requirements. The SMBJ3V3HE3_A/I supports 200A peak pulse current with 10.3V clamping, while the SMBJ3V3HE3_B/I supports 50A peak pulse current with 7.3V clamping. Both maintain identical 600W peak pulse power dissipation and operate across the full automotive temperature range (-65°C to 175°C). ROHS3 compliance is maintained across both variants.

Frequently Asked Questions (FAQ)

Q: Can SMBJ3V3HE3_B/I directly replace SMBJ3V3HE3_A/I in existing designs?

A: Yes, from a mechanical and electrical standpoint. Both parts share identical reverse standoff voltage (3.3V), breakdown voltage (4.1V), package type (DO-214AA, SMB), and automotive qualifications (AEC-Q101). Verify that your application's transient current requirements do not exceed 50A peak pulse, as the substitute part is rated for 50A versus the original 200A.

Q: What is the significance of the different clamping voltages (10.3V vs. 7.3V)?

A: Clamping voltage represents the maximum voltage across the TVS diode during transient suppression at peak pulse current. The SMBJ3V3HE3_B/I clamps at 7.3V compared to 10.3V for the SMBJ3V3HE3_A/I. This lower clamping voltage may provide superior protection in applications sensitive to voltage overshoot, provided the 50A peak pulse current rating is sufficient.

Q: Are there packaging differences between these parts?

A: Both parts use the DO-214AA (SMB) surface mount package. The SMBJ3V3HE3_A/I is supplied in bulk packaging, while the SMBJ3V3HE3_B/I is available in Tape & Reel (TR) format. This difference affects procurement and assembly processes but does not impact electrical or mechanical compatibility.

Q: Why is the original part marked as obsolete?

A: Product obsolescence typically reflects manufacturer discontinuation decisions based on market demand and product portfolio optimization. The SMBJ3V3HE3_B/I remains in active production, providing a supported alternative for new designs and ongoing production requirements.

Q: Do both parts meet automotive qualification standards?

A: Yes. Both SMBJ3V3HE3_A/I and SMBJ3V3HE3_B/I carry AEC-Q101 qualification and automotive-grade designation, meeting automotive industry reliability and quality standards. Both are ROHS3 compliant.