CZRB3028-G Zener Diode Equivalent & Substitute Parts

Part Overview

The CZRB3028-G is a 28V, 3W Zener diode manufactured by Comchip Technology in the DO-214AA (SMB) surface mount package. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The part operates within a ±5% voltage tolerance and is suitable for voltage regulation and protection applications in surface mount assemblies.

Substiute Parts

CZRB3028-G

Comchip TechnologyIn Stock: 769CZRB3028-G Datasheet

Current PartRFQ

CZRB3028-HF

Comchip TechnologyIn Stock: 1113CZRB3028-HF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CZRB3028-G is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

• Zener voltage: 28 V nominal
• Power dissipation rating: 3 W maximum
• Voltage tolerance: ±5%
• Impedance (maximum): 12 Ohms
• Reverse leakage current: 500 nA @ 21 V
• Forward voltage: 1.5 V maximum @ 200 mA

Mechanical Parameters (Must Match):

• Package type: DO-214AA (SMB)
• Mounting technology: Surface Mount

Compliance Parameters (Must Match):

• RoHS3 compliance
• Moisture Sensitivity Level: 1

The substitute part must satisfy all electrical and mechanical specifications without deviation. Product status (active vs. obsolete) and operating temperature range are secondary considerations that support long-term availability and reliability but do not affect functional interchangeability.

Parameter Comparison

Engineering Selection Recommendations

CZRB3028-HF is the direct functional equivalent and recommended substitute for CZRB3028-G.

Basis for Selection:

1. Electrical Equivalence: All critical electrical parameters are identical, including zener voltage (28 V), power rating (3 W), tolerance (±5%), impedance (12 Ohms), reverse leakage current (500 nA @ 21 V), and forward voltage (1.5 V @ 200 mA).

2. Mechanical Compatibility: Both parts use identical DO-214AA (SMB) surface mount packaging, ensuring direct PCB footprint compatibility without layout modification.

3. Product Status: CZRB3028-HF carries active product status, providing superior long-term availability and supply chain continuity compared to the obsolete CZRB3028-G.

4. Compliance: CZRB3028-HF maintains RoHS3 compliance and meets regulatory requirements equivalent to the original part.

5. Operating Temperature: CZRB3028-HF specifies an operating temperature range of -55°C to 150°C (TJ), providing defined thermal performance for system design validation.

No design modifications, circuit adjustments, or additional testing protocols are required for substitution. Direct replacement is applicable for all applications where CZRB3028-G was originally specified.

Frequently Asked Questions (FAQ)

Q: Can CZRB3028-HF be used as a direct replacement for CZRB3028-G without PCB modification?

A: Yes. Both parts share identical electrical specifications and DO-214AA (SMB) package geometry. No PCB layout changes are necessary.

Q: What is the primary reason for substituting CZRB3028-G?

A: CZRB3028-G is classified as obsolete. CZRB3028-HF is the active equivalent, ensuring ongoing component availability and supply chain reliability.

Q: Are the electrical characteristics identical between these parts?

A: Yes. Zener voltage (28 V), power dissipation (3 W), tolerance (±5%), impedance (12 Ohms), reverse leakage (500 nA @ 21 V), and forward voltage (1.5 V @ 200 mA) are identical.

Q: Does CZRB3028-HF meet the same compliance standards?

A: Yes. CZRB3028-HF is RoHS3 compliant and meets regulatory requirements equivalent to CZRB3028-G.

Q: What is the operating temperature range for CZRB3028-HF?

A: CZRB3028-HF operates from -55°C to 150°C (junction temperature). This specification was not provided for CZRB3028-G.

Q: Are there any package or footprint differences?

A: No. Both parts use the DO-214AA (SMB) surface mount package with identical footprint dimensions and land pattern requirements.

Q: Is inventory availability a consideration in this substitution?

A: CZRB3028-HF has 1093 pieces in stock (new original), compared to 729 pieces for CZRB3028-G. The substitute offers improved availability.