SMBG33C-E3/5B Equivalent & Substitute Parts

Part Overview

The SMBG33C-E3/5B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose transient voltage 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 part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and maintenance requirements.

Substiute Parts

SMBG33C-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 973SMBG33C-E3/5B Datasheet

Current PartRFQ

SMBG33CA-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 737SMBG33CA-E3/5B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBG33C-E3/5B is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff: 33V (identical)
• Voltage - Breakdown (Min): 36.7V (identical)
• Package / Case: DO-215AA, SMB Gull Wing (identical)
• Mounting Type: Surface Mount (identical)
• Bidirectional Channels: 1 (identical)
• Operating Temperature Range: -55°C to 150°C (identical)
• RoHS and REACH Compliance: ROHS3 Compliant, REACH Unaffected (identical)

The SMBG33CA-E3/5B qualifies as a direct substitute based on matching all core electrical and mechanical parameters. Variations in clamping voltage (53.3V vs. 59V) and peak pulse current (11.3A vs. 10.2A) remain within the functional tolerance of the SMBG33 series specification, as both parts share the identical reverse standoff voltage and breakdown characteristics that define the protection threshold.

Parameter Comparison

Engineering Selection Recommendations

The SMBG33CA-E3/5B is the qualified substitute for the obsolete SMBG33C-E3/5B. Selection is based on the following engineering criteria:

• Both parts maintain identical reverse standoff voltage (33V) and breakdown voltage (36.7V), ensuring equivalent circuit protection thresholds.
• Both parts are housed in the identical DO-215AA SMB Gull Wing surface-mount package, enabling direct PCB footprint compatibility without layout modification.
• The SMBG33CA-E3/5B carries Active product status, ensuring continued availability and supply chain support, whereas the SMBG33C-E3/5B is obsolete.
• Both parts satisfy ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component manufacturing and distribution.
• Moisture Sensitivity Level 1 (Unlimited) classification applies to both parts, indicating no special storage or handling requirements.
• The SMBG33CA-E3/5B offers improved peak pulse current capability (11.3A vs. 10.2A) while maintaining identical power dissipation rating (600W), providing enhanced performance margin in transient suppression applications.

Frequently Asked Questions (FAQ)

Q: Can the SMBG33CA-E3/5B be used as a direct replacement for the SMBG33C-E3/5B without circuit modification?

A: Yes. Both parts share identical reverse standoff voltage (33V), breakdown voltage (36.7V), and DO-215AA SMB package configuration. Direct substitution on existing PCBs is electrically and mechanically compatible.

Q: What is the significance of the difference in clamping voltage between the two parts (59V vs. 53.3V)?

A: Both clamping voltages fall within the operational specification of the SMBG33 series. The lower clamping voltage of the SMBG33CA-E3/5B (53.3V) provides tighter voltage regulation during transient events, which is beneficial for sensitive circuit protection. This represents an improvement over the original part.

Q: Why is the SMBG33C-E3/5B classified as obsolete?

A: Obsolescence reflects the manufacturer's discontinuation of this specific part variant. The SMBG33CA-E3/5B represents the active continuation of the SMBG33 series with equivalent electrical performance and improved specifications.

Q: Are there any packaging differences between these parts?

A: No. Both parts use the DO-215AA SMB Gull Wing surface-mount package. The SMBG33CA-E3/5B is supplied in Tape & Reel (TR) format, which is standard for high-volume production and automated assembly.

Q: Do both parts meet current regulatory compliance standards?

A: Yes. Both the SMBG33C-E3/5B and SMBG33CA-E3/5B are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: What is the operating temperature range for these TVS diodes?

A: Both parts operate across the temperature range of -55°C to 150°C (junction temperature), providing performance stability across industrial and commercial application environments.