CLL4625 BK Zener Diode Equivalent & Substitute Parts

Part Overview

The CLL4625 BK is a 5.1 V Zener diode rated for 500 mW power dissipation in a surface mount SOD-80 (DO-213AC, MINI-MELF) package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity. The part operates across a temperature range of -65°C to 200°C and maintains ±5% voltage tolerance at nominal specification.

Substiute Parts

CLL4625 BK

Central Semiconductor CorpIn Stock: 1128CLL4625 BK Datasheet

Current PartRFQ

CMHZ4625 BK

Central Semiconductor CorpIn Stock: 945CMHZ4625 BK Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CLL4625 BK is determined by electrical parameter equivalence and mechanical compatibility. The primary substitute identified is the CMHZ4625 BK, which maintains identical electrical specifications across all critical parameters: 5.1 V nominal Zener voltage, ±5% tolerance, 500 mW maximum power rating, 1500 Ohms maximum impedance, and 10 µA reverse leakage current at 3 V.

The key substitution criteria are:

• Zener voltage (Nominal): 5.1 V
• Voltage tolerance: ±5%
• Maximum power dissipation: 500 mW
• Maximum impedance: 1500 Ohms
• Reverse leakage current: 10 µA @ 3 V
• Mounting type: Surface Mount

The CMHZ4625 BK differs in package format (SOD-123 versus SOD-80) and operating temperature range (-65°C to 150°C versus -65°C to 200°C), with the latter representing a reduced upper temperature limit. The forward voltage specification also differs (1.5 V @ 100 mA versus 1 V @ 200 mA), reflecting measurement conditions rather than fundamental electrical differences at the 5.1 V Zener operating point.

Parameter Comparison

Engineering Selection Recommendations

The CMHZ4625 BK serves as the primary substitute for the obsolete CLL4625 BK. Both components are manufactured by Central Semiconductor Corp and share identical electrical performance at the 5.1 V Zener operating point. The CMHZ4625 BK maintains active product status, ensuring continued availability and supply chain support.

Selection of the CMHZ4625 BK requires evaluation of two design considerations:

1. Package format change from SOD-80 (DO-213AC, MINI-MELF) to SOD-123 necessitates PCB layout modification and potential footprint redesign.

2. Operating temperature range reduction from -65°C to 200°C to -65°C to 150°C must be assessed against application thermal requirements. Circuits operating above 150°C junction temperature cannot use the CMHZ4625 BK as a direct substitute.

For applications where the upper temperature limit of 150°C is insufficient, alternative 5.1 V Zener diodes with extended temperature ratings must be evaluated against the same electrical parameter criteria.

Frequently Asked Questions (FAQ)

Q: Can the CMHZ4625 BK replace the CLL4625 BK in all applications?

A: The CMHZ4625 BK provides electrical equivalence for Zener voltage, power rating, impedance, and leakage current. Substitution is valid only when the application's maximum junction temperature does not exceed 150°C and the SOD-123 package footprint is compatible with the PCB design.

Q: What is the primary difference between these two parts?

A: The CLL4625 BK uses SOD-80 packaging with a 200°C maximum junction temperature. The CMHZ4625 BK uses SOD-123 packaging with a 150°C maximum junction temperature. Electrical specifications at the 5.1 V Zener operating point are identical.

Q: Does the forward voltage difference affect Zener diode operation?

A: Forward voltage specifications (1 V @ 200 mA for CLL4625 BK versus 1.5 V @ 100 mA for CMHZ4625 BK) reflect measurement conditions and do not affect performance in Zener regulation circuits, where the diode operates in reverse bias at 5.1 V.

Q: Are there compliance or certification differences between these parts?

A: Both parts carry EAR99 ECCN classification and 8541.10.0050 HTSUS code. The CMHZ4625 BK includes REACH Unaffected status. No compliance barriers exist for substitution.

Q: What package considerations apply to PCB redesign?

A: SOD-80 and SOD-123 are distinct surface mount packages with different footprints, lead spacing, and solder pad geometries. PCB layout must be modified to accommodate the SOD-123 package dimensions and placement requirements.