SMBG33-E3/5B Equivalent & Substitute Parts

Part Overview

The SMBG33-E3/5B is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, designed for general-purpose transient protection applications. This component features a 33V reverse standoff voltage with a 59V maximum clamping voltage and 10.2A peak pulse current capability in a surface-mount DO-215AA (SMB) package.

The SMBG33-E3/5B is classified as obsolete. Equivalent and substitute parts are available to maintain design continuity and ensure supply chain reliability for applications requiring TVS protection in this voltage class.

Substiute Parts

SMBG33-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 887SMBG33-E3/5B Datasheet

Current PartRFQ

SMBG33A-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 857SMBG33A-E3/5B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBG33-E3/5B is determined by the following critical parameters:

• Reverse Standoff Voltage (Typ): 33V — must remain constant
• Breakdown Voltage (Min): 36.7V — must remain constant
• Package / Case: DO-215AA, SMB Gull Wing — must match for PCB compatibility
• Mounting Type: Surface Mount — must match assembly process
• Unidirectional Channels: 1 — must remain constant
• Operating Temperature Range: -55°C to 150°C (TJ) — must be maintained or exceeded

The substitute part SMBG33A-E3/5B maintains identical reverse standoff voltage, breakdown voltage, package type, and operating temperature range. Variations in clamping voltage and peak pulse current are within the acceptable tolerance band for the 33V TVS diode classification and do not affect functional substitution in general-purpose transient protection applications.

Parameter Comparison

Engineering Selection Recommendations

The SMBG33A-E3/5B is the direct substitute for the obsolete SMBG33-E3/5B. Both components are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity classification, ensuring compatibility with standard surface-mount assembly processes.

The SMBG33A-E3/5B is currently in active production status, providing assured supply availability. The lower clamping voltage (53.3V versus 59V) and higher peak pulse current (11.3A versus 10.2A) represent performance improvements within the 33V TVS diode class and do not introduce compatibility issues for general-purpose transient protection applications.

Selection should be based on current design requirements and supply chain availability. The active product status of SMBG33A-E3/5B makes it the preferred choice for new designs and ongoing production.

Frequently Asked Questions (FAQ)

Q: Can SMBG33A-E3/5B replace SMBG33-E3/5B in existing designs?

A: Yes. Both components share identical reverse standoff voltage (33V), breakdown voltage (36.7V), package type (DO-215AA), and operating temperature range (-55°C to 150°C). The SMBG33A-E3/5B is a direct functional substitute.

Q: What is the significance of the lower clamping voltage in SMBG33A-E3/5B?

A: The SMBG33A-E3/5B has a maximum clamping voltage of 53.3V compared to 59V in the SMBG33-E3/5B. This represents improved clamping performance and does not affect substitution compatibility for general-purpose transient protection applications.

Q: Are there package or mounting differences between these parts?

A: No. Both components use the DO-215AA (SMB Gull Wing) surface-mount package. PCB footprints and assembly processes are identical.

Q: What is the product status difference, and why does it matter?

A: The SMBG33-E3/5B is obsolete, while SMBG33A-E3/5B is active production. Active status ensures continued availability, technical support, and compliance with current regulatory standards.

Q: Are both parts RoHS compliant?

A: Yes. Both SMBG33-E3/5B and SMBG33A-E3/5B are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity classification.