1SMB33CAT3G Equivalent & Substitute Parts

Part Overview

The 1SMB33CAT3G is a ZEN SMB Transient Voltage Suppressor (TVS) diode manufactured by onsemi, rated for 600W peak pulse power at 33V reverse standoff voltage. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity. Substitute parts must maintain identical electrical performance characteristics and package compatibility to ensure direct replacement capability in existing circuit designs.

Substiute Parts

1SMB33CAT3G

onsemiIn Stock: 2526771SMB33CAT3G Datasheet

Current PartRFQ

SMBJ33CA

MDDIn Stock: 25872SMBJ33CA Datasheet

DirectRFQ

P6SMBJ33CA_R1_00001

Panjit International Inc.In Stock: 902P6SMBJ33CA_R1_00001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1SMB33CAT3G are qualified based on the following critical parameters that determine functional equivalence:

• Voltage - Reverse Standoff (Typ): 33V
• Voltage - Breakdown (Min): 36.7V
• Voltage - Clamping (Max) @ Ipp: 53.3V
• Current - Peak Pulse (10/1000µs): 11.3A
• Power - Peak Pulse: 600W
• Package / Case: SMB/DO-214AA
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

All identified substitute parts maintain these electrical and mechanical specifications, ensuring direct replacement compatibility without circuit redesign or performance degradation.

Parameter Comparison

Engineering Selection Recommendations

Both SMBJ33CA (MDD) and P6SMBJ33CA_R1_00001 (Panjit International Inc.) are active product alternatives to the obsolete 1SMB33CAT3G. Selection between these substitutes should be based on:

• Procurement availability and lead time requirements
• Supply chain continuity and inventory levels
• Compliance certification alignment (both maintain ROHS3 compliance and REACH unaffected status)
• Operating temperature range requirements (P6SMBJ33CA_R1_00001 extends to -55°C minimum versus -50°C for SMBJ33CA)
• Packaging format preference (SMBJ33CA supplied as standard; P6SMBJ33CA_R1_00001 available in Tape & Reel format)

Both parts maintain identical electrical specifications and SMB/DO-214AA package compatibility, ensuring functional equivalence in transient voltage suppression applications.

Frequently Asked Questions (FAQ)

Q: Can SMBJ33CA or P6SMBJ33CA_R1_00001 be used as direct replacements for 1SMB33CAT3G?

A: Yes. Both substitute parts maintain identical reverse standoff voltage (33V), peak pulse power (600W), and SMB/DO-214AA package specifications. No circuit modifications are required for direct substitution.

Q: What is the difference between SMBJ33CA and P6SMBJ33CA_R1_00001?

A: The primary differences are manufacturer (MDD versus Panjit International Inc.), operating temperature range (-50°C to 150°C versus -55°C to 150°C), and packaging format (standard versus Tape & Reel). Electrical performance is identical.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The 1SMB33CAT3G, SMBJ33CA, and P6SMBJ33CA_R1_00001 are all ROHS3 compliant with MSL rating of 1 (Unlimited).

Q: Does the SMB/DO-214AA package ensure PCB compatibility?

A: Yes. All three parts use the same SMB/DO-214AA surface mount package, ensuring identical footprint and soldering requirements on existing PCB designs.

Q: Which substitute part should be selected for new designs?

A: Either SMBJ33CA or P6SMBJ33CA_R1_00001 is suitable. Selection should be based on supplier availability, cost, and specific operating temperature requirements of the application.