CLL457A TR Equivalent & Substitute Parts

Part Overview

The CLL457A TR 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 operates at 23 V DC reverse voltage with a 50 mA average rectified current rating and is classified as obsolete product status. Due to its obsolete classification, sourcing equivalent or substitute components is necessary for new designs, production continuity, and long-term availability assurance.

Substiute Parts

CLL457A TR

Central Semiconductor CorpIn Stock: 965CLL457A TR Datasheet

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CMHD457A TR

Central Semiconductor CorpIn Stock: 1059CMHD457A TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the CLL457A TR is determined by the following critical parameters:

Voltage Rating Compatibility: The substitute component must have a DC reverse voltage (Vr) rating equal to or greater than 23 V to ensure safe operation under maximum reverse bias conditions.

Current Rating Compatibility: The substitute component must have an average rectified current (Io) rating equal to or greater than 50 mA to handle the intended load without exceeding thermal or electrical limits.

Speed Classification: The substitute must operate within the small signal rectifier category (≤ 200mA) to maintain consistent switching and recovery characteristics.

Mounting and Package Compatibility: The substitute must be a surface mount device compatible with standard PCB assembly processes. Package form factor may differ from SOD-80 if the substitute meets all electrical parameters and fits within the physical constraints of the application.

Technology Type: Standard rectifier diode technology is required to maintain functional equivalence.

The CMHD457A TR meets these substitution criteria with enhanced electrical performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The CLL457A TR is classified as obsolete, which restricts future procurement and inventory replenishment. The CMHD457A TR carries active product status, ensuring continued manufacturing support and supply chain availability.

Electrical Performance: The CMHD457A TR provides superior electrical characteristics across all measured parameters. The reverse voltage rating of 70 V exceeds the 23 V requirement by a factor of 3.04, and the current rating of 200 mA exceeds the 50 mA requirement by a factor of 4. These margins provide enhanced design robustness and thermal headroom.

Compliance and Certification: Both components share identical ECCN (EAR99) and HTSUS (8541.10.0070) classifications, confirming regulatory equivalence. The CMHD457A TR includes REACH Unaffected status, providing additional environmental compliance documentation.

Package Transition: The CMHD457A TR uses SOD-123 packaging instead of SOD-80. This transition requires PCB layout verification to confirm physical fit within the designated component footprint. SOD-123 is a widely standardized package with established design guidelines.

Temperature Operating Range: The CMHD457A TR extends the operating temperature range to -65°C to 150°C, compared to the CLL457A TR range of -50°C to 75°C. This expanded range accommodates applications with more demanding thermal environments.

Frequently Asked Questions (FAQ)

Q: Can the CMHD457A TR directly replace the CLL457A TR in existing designs?

A: The CMHD457A TR meets all electrical performance requirements for substitution. However, the package change from SOD-80 to SOD-123 requires PCB layout verification. Physical dimensions and land pattern footprints differ between these packages, necessitating design review before implementation.

Q: What are the key electrical advantages of the CMHD457A TR?

A: The CMHD457A TR provides a 70 V reverse voltage rating versus 23 V, a 200 mA current rating versus 50 mA, and significantly lower reverse leakage current (25 nA at 70 V versus 10 µA at 1.5 V). These enhancements deliver improved reliability margins and reduced leakage in the application circuit.

Q: Are there any thermal considerations when substituting these components?

A: The CMHD457A TR supports an extended junction temperature range of -65°C to 150°C, compared to -50°C to 75°C for the CLL457A TR. This expanded range accommodates applications with higher ambient temperatures or thermal stress conditions. The higher current rating (200 mA) also provides greater thermal headroom for the same 50 mA application load.

Q: How does the package change from SOD-80 to SOD-123 affect assembly?

A: SOD-123 is a standard surface mount package with established manufacturing processes. The transition requires updating the PCB footprint and verifying component placement within the available board space. Both packages are compatible with standard reflow soldering processes.

Q: What is the significance of the CMHD457A TR's active product status?

A: Active product status ensures ongoing manufacturing, quality control, and supply chain availability. The obsolete status of the CLL457A TR creates long-term sourcing risk. Transitioning to the CMHD457A TR eliminates this risk and provides design continuity for future production runs.

Q: Are the forward voltage characteristics compatible between these diodes?

A: The forward voltage specifications are measured under different test conditions. The CLL457A TR specifies 250 mV at 100 µA, while the CMHD457A TR specifies 1 V at 100 mA. These different test currents reflect the different current ratings of each device. For the 50 mA application load, the CMHD457A TR forward voltage will be lower than the specified 1 V maximum.

Q: Do both components share the same regulatory classifications?

A: Yes. Both the CLL457A TR and CMHD457A TR carry identical ECCN (EAR99) and HTSUS (8541.10.0070) classifications. The CMHD457A TR additionally includes REACH Unaffected status, providing enhanced environmental compliance documentation.