CLL457A BK Equivalent & Substitute Parts

Part Overview

The CLL457A BK is a general-purpose rectifier diode manufactured by Central Semiconductor Corp, designed for surface mount applications in the SOD-80 (DO-213AC, MINI-MELF) package. This component is rated for 23 V DC reverse voltage with 50 mA average rectified current and operates across a junction temperature range of -50°C to 75°C.

The CLL457A BK is classified as obsolete. Identifying equivalent and substitute parts is necessary to support ongoing maintenance, repair, and redesign activities for legacy systems and applications where this component was originally specified.

Substiute Parts

CLL457A BK

Central Semiconductor CorpIn Stock: 733CLL457A BK Datasheet

Current PartRFQ

CMHD457A BK

Central Semiconductor CorpIn Stock: 873CMHD457A BK Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CLL457A BK requires evaluation based on the following critical parameters:

Voltage Rating Compatibility: The substitute part must support a DC reverse voltage (Vr) equal to or greater than 23 V to ensure safe operation in the original circuit application.

Current Rating Compatibility: The substitute part must support an average rectified current (Io) equal to or greater than 50 mA to handle the circuit's current demands.

Forward Voltage Characteristics: The substitute part's forward voltage drop must be compatible with circuit design margins. The original part specifies 250 mV maximum at 100 µA.

Reverse Leakage Current: The substitute part's reverse leakage current must not exceed acceptable limits for the application. The original part specifies 10 µA maximum at 1.5 V.

Speed Classification: Both the original and substitute parts are classified as small signal diodes with current ratings ≤ 200 mA and any speed capability.

Mounting and Package Considerations: Surface mount technology is required. Package form factor differences may require PCB layout modifications.

Temperature Operating Range: The substitute part's junction temperature range must accommodate the application's thermal environment.

The CMHD457A BK meets or exceeds all critical electrical parameters of the CLL457A BK while offering active product status and extended temperature range capability.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: CMHD457A BK

The CMHD457A BK is the recommended substitute for the obsolete CLL457A BK based on the following engineering criteria:

Electrical Parameter Compliance: The CMHD457A BK exceeds all critical electrical specifications of the original part. The 70 V reverse voltage rating provides a 3× safety margin over the 23 V requirement. The 200 mA current rating provides a 4× margin over the 50 mA requirement. Reverse leakage current is significantly reduced to 25 nanoamperes, indicating superior semiconductor quality and lower power dissipation in reverse bias conditions.

Product Status and Availability: The CMHD457A BK holds active product status with confirmed inventory of 845 pieces in stock. This ensures long-term availability and supply chain continuity compared to the obsolete CLL457A BK.

Compliance and Certification: Both parts share identical ECCN (EAR99) and HTSUS (8541.10.0070) classifications, ensuring equivalent export and tariff treatment.

Temperature Range Extension: The CMHD457A BK operates across -65°C to 150°C, extending the lower and upper temperature limits beyond the original -50°C to 75°C range. This provides enhanced thermal margin for applications subject to wider environmental conditions.

Package Consideration: The CMHD457A BK uses SOD-123 packaging, which differs from the original SOD-80 (MINI-MELF) package. PCB layout modification is required to accommodate the different footprint. SOD-123 is a widely standardized surface mount package with established design guidelines and manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can the CMHD457A BK directly replace the CLL457A BK without circuit modification?

A: The CMHD457A BK is electrically compatible with the CLL457A BK for all functional requirements. However, the different package form factor (SOD-123 versus SOD-80/MINI-MELF) requires PCB footprint modification. No changes to circuit schematic or component values are necessary.

Q: What is the significance of the higher voltage rating (70 V) on the CMHD457A BK?

A: The higher voltage rating provides design margin and protection against voltage transients. In applications where the CLL457A BK was rated for 23 V, the CMHD457A BK's 70 V rating ensures reliable operation with additional safety headroom. This does not negatively affect circuit performance.

Q: How does the reduced reverse leakage current (25 nA versus 10 µA) affect circuit operation?

A: Lower reverse leakage current reduces power dissipation and improves circuit efficiency, particularly in high-impedance applications. This represents an improvement over the original part and does not introduce compatibility issues.

Q: Is the extended temperature range (-65°C to 150°C) beneficial for all applications?

A: The extended temperature range provides additional operational margin for applications subject to extreme environmental conditions. For applications originally designed within the -50°C to 75°C range, the extended range offers enhanced reliability without negative effects.

Q: What design considerations are necessary for the SOD-123 package transition?

A: SOD-123 is a standard surface mount package with established PCB design guidelines. The primary consideration is footprint modification on the printed circuit board. Component placement, solder reflow profiles, and assembly processes remain consistent with standard surface mount manufacturing practices.

Q: Are there alternative substitute parts available?

A: The CMHD457A BK is the primary substitute from Central Semiconductor Corp. The substitute list indicates cross-references to 1N4148WS-13-F, BAV16WS-7-F, and 1N4148WT-7 from other manufacturers, which meet equivalent electrical specifications and package requirements.

Q: What is the inventory status for the CMHD457A BK?

A: The CMHD457A BK has 845 pieces of new original stock currently available, ensuring immediate procurement capability and supply continuity.