CZRB3033-G Zener Diode 33V 3W Equivalent & Substitute Parts

Part Overview

The CZRB3033-G is a 33V 3W Zener diode manufactured by Comchip Technology in DO-214AA (SMB) surface mount package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design support and procurement. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), making it suitable for standard industrial and commercial applications requiring voltage regulation and transient protection.

Substiute Parts

CZRB3033-G

Comchip TechnologyIn Stock: 824CZRB3033-G Datasheet

Current PartRFQ

CZRB3033-HF

Comchip TechnologyIn Stock: 921CZRB3033-HF Datasheet

MFR RecommendedRFQ

SMBJ5937B-TP

Micro Commercial CoIn Stock: 931SMBJ5937B-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CZRB3033-G is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

• Zener voltage: 33V nominal with ±5% tolerance
• Package type: DO-214AA (SMB) surface mount
• Mounting configuration: Surface mount
• Regulatory compliance: ROHS3 compliance and REACH unaffected status

Secondary Compatibility Factors:

• Power dissipation capability (minimum 3W for direct substitution)
• Impedance characteristics (maximum 20 Ohms preferred)
• Reverse leakage current specifications
• Forward voltage characteristics

The CZRB3033-G has one identified substitute: CZRB3033-HF (Comchip Technology, active product status). The SMBJ5937B-TP (Micro Commercial Co) is listed as a functional alternative but operates at reduced power rating (1.5W versus 3W) and exhibits different impedance and leakage characteristics.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: CZRB3033-HF

The CZRB3033-HF is the direct equivalent substitute for the obsolete CZRB3033-G. Both parts are manufactured by Comchip Technology and share identical electrical specifications: 33V nominal zener voltage, 3W maximum power dissipation, 20 Ohms maximum impedance, and 500 nA reverse leakage current. The CZRB3033-HF maintains active product status, ensuring long-term availability and supply chain continuity. Operating temperature range (-55°C to 150°C) is specified for the active part, providing defined thermal performance boundaries.

Secondary Alternative: SMBJ5937B-TP

The SMBJ5937B-TP from Micro Commercial Co operates at the same 33V zener voltage with identical tolerance and forward voltage characteristics. However, this part exhibits reduced power dissipation capability (1.5W versus 3W) and higher impedance (33 Ohms versus 20 Ohms). The reverse leakage current is also elevated (1 µA versus 500 nA). Selection of SMBJ5937B-TP is appropriate only for applications where the 1.5W power rating is sufficient and the higher impedance does not compromise circuit performance.

Both substitute options maintain REACH unaffected status and EAR99 ECCN classification, consistent with the original part's regulatory profile.

Frequently Asked Questions (FAQ)

Q: Can CZRB3033-HF directly replace CZRB3033-G without circuit modification?

A: Yes. The CZRB3033-HF is a direct equivalent with identical electrical parameters (33V, 3W, 20 Ohms impedance, 500 nA leakage) and package configuration (DO-214AA SMB). No circuit redesign is required.

Q: What is the key difference between CZRB3033-HF and SMBJ5937B-TP?

A: The primary differences are power dissipation (3W versus 1.5W), impedance (20 Ohms versus 33 Ohms), and reverse leakage current (500 nA versus 1 µA). CZRB3033-HF is the direct equivalent; SMBJ5937B-TP is a functional alternative for lower-power applications.

Q: Is SMBJ5937B-TP suitable for applications requiring 3W power dissipation?

A: No. SMBJ5937B-TP is rated for maximum 1.5W power dissipation. Use only in applications where thermal and power requirements do not exceed this limit.

Q: Are both substitute parts available in the same package?

A: Yes. Both CZRB3033-HF and SMBJ5937B-TP use DO-214AA (SMB) surface mount package, ensuring identical PCB footprint compatibility with the original CZRB3033-G.

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

A: CZRB3033-G is obsolete; CZRB3033-HF and SMBJ5937B-TP are active products. Active status ensures ongoing manufacturing, quality control, and supply availability for future procurement cycles.

Q: Do the substitute parts meet the same compliance standards?

A: CZRB3033-G is specified as ROHS3 compliant. Both substitute parts maintain REACH unaffected status and EAR99 ECCN classification. Verify ROHS3 compliance with the manufacturer for CZRB3033-HF and SMBJ5937B-TP if required for your application.