CZ5377B BK Zener Diode Equivalent & Substitute Parts

Part Overview

The CZ5377B BK is a 91 V, 5 W Zener diode manufactured by Central Semiconductor Corp in the DO-201AA axial through-hole package. This component is classified as obsolete, indicating discontinued production and limited availability. The substitute part 1N5377BRLG, manufactured by onsemi, provides functional equivalence with identical electrical specifications and active product status, making it suitable for applications requiring continued component sourcing and long-term supply chain reliability.

Substiute Parts

CZ5377B BK

Central Semiconductor CorpIn Stock: 1179CZ5377B BK Datasheet

Current PartRFQ

1N5377BRLG

onsemiIn Stock: 56721N5377BRLG Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The substitute part 1N5377BRLG qualifies as a direct equivalent based on the following criteria:

Electrical Parameter Matching:

• Zener voltage: 91 V (identical)
• Tolerance: ±5% (identical)
• Maximum power dissipation: 5 W (identical)
• Maximum impedance: 75 Ohms (identical)
• Reverse leakage current: 500 nA @ 69.2 V (identical)
• Forward voltage: 1.2 V @ 1 A (identical)

Mechanical Compatibility:

• Mounting type: Through Hole (identical)
• Package classification: Axial (compatible with DO-201AA form factor)

Compliance and Availability:

• Product status: Active (versus obsolete main part)
• RoHS compliance: ROHS3 Compliant (versus non-compliant main part)
• REACH status: Unaffected (identical)
• ECCN classification: EAR99 (identical)
• HTSUS code: 8541.10.0050 (identical)

The substitute part operates across an extended temperature range (-65°C to 200°C versus -65°C to 150°C), providing additional thermal margin in applications requiring higher operating temperatures.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 1N5377BRLG

The 1N5377BRLG is the appropriate substitute for the obsolete CZ5377B BK based on the following engineering factors:

1. Electrical Equivalence: All critical electrical parameters match exactly, including zener voltage, power rating, impedance, leakage current, and forward voltage characteristics. The component functions identically in circuit applications.

2. Product Status: The substitute is actively manufactured by onsemi, ensuring reliable long-term availability and supply chain continuity. The main part's obsolete status creates sourcing risk.

3. Regulatory Compliance: The substitute meets ROHS3 compliance requirements, whereas the main part is non-compliant. This is significant for applications subject to RoHS directives or customer compliance requirements.

4. Thermal Performance: The extended operating temperature range (-65°C to 200°C) of the substitute provides additional thermal margin compared to the main part (-65°C to 150°C), beneficial for high-temperature applications.

5. Package Compatibility: Both components use axial through-hole packaging. The substitute's T-18 designation is compatible with DO-201AA footprints used in PCB designs for the main part.

6. Certification Alignment: Both parts share identical ECCN (EAR99) and HTSUS (8541.10.0050) classifications, ensuring consistent regulatory treatment.

Frequently Asked Questions (FAQ)

Q: Can 1N5377BRLG be used as a direct replacement for CZ5377B BK in existing designs?

A: Yes. The electrical specifications are identical across all critical parameters: 91 V zener voltage, ±5% tolerance, 5 W power rating, 75 Ohms maximum impedance, and matching leakage and forward voltage characteristics. The axial through-hole package is compatible with existing PCB footprints designed for the CZ5377B BK.

Q: What is the significance of the extended temperature range in the substitute part?

A: The 1N5377BRLG operates from -65°C to 200°C, compared to -65°C to 150°C for the CZ5377B BK. This 50°C extension at the upper limit provides additional thermal margin for applications operating in elevated temperature environments or with high ambient conditions.

Q: Does the RoHS compliance difference affect substitution?

A: The 1N5377BRLG is ROHS3 compliant, while the CZ5377B BK is non-compliant. For applications subject to RoHS directives or customer compliance requirements, the substitute is the appropriate choice. For legacy systems without RoHS requirements, both parts function identically.

Q: Are there any package differences that affect PCB assembly?

A: Both components use axial through-hole packaging. The main part is designated DO-201AA/DO-27, while the substitute is designated T-18. These designations refer to the same physical form factor and are compatible with identical PCB footprints and assembly processes.

Q: Why is the main part listed as obsolete?

A: The CZ5377B BK is classified as obsolete, indicating discontinued production by Central Semiconductor Corp. The 1N5377BRLG substitute is actively manufactured by onsemi, providing continued availability and supply chain reliability.

Q: Are the electrical characteristics guaranteed to be identical in all operating conditions?

A: Yes. The specified electrical parameters—zener voltage, tolerance, power dissipation, impedance, leakage current, and forward voltage—are identical between the two parts. These parameters define the component's behavior across the operating temperature range and are the basis for substitution equivalence.

Q: Can the substitute part be used in high-reliability or military applications?

A: Substitution decisions for high-reliability or military applications depend on specific qualification requirements beyond the electrical and mechanical parameters provided. Consult application-specific standards and qualification documentation for such applications.