CMLD4448 TR Equivalent & Substitute Parts

Part Overview

The CMLD4448 TR is a general-purpose diode array featuring two independent diodes rated for 120 V DC reverse voltage and 250 mA average rectified current per diode. Manufactured by Central Semiconductor Corp, this component is packaged in SOT-563/SOT-666 surface mount configuration with fast recovery characteristics (≤500 ns). The product is currently obsolete, necessitating identification of functionally compatible substitute components for ongoing design requirements and inventory replenishment.

Substiute Parts

CMLD4448 TR

Central Semiconductor CorpIn Stock: 838CMLD4448 TR Datasheet

Current PartRFQ

BAV23-7

Diodes IncorporatedIn Stock: 3157BAV23-7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CMLD4448 TR is determined by the following critical parameters:

Configuration Match: Both the main part and substitute must feature 2 independent diodes to maintain circuit topology compatibility.

Voltage Rating: The substitute must equal or exceed the 120 V DC reverse voltage specification. Higher voltage ratings provide design margin and are acceptable for substitution.

Current Rating: The substitute must equal or exceed the 250 mA average rectified current per diode. Higher current ratings ensure the substitute can handle the same or greater load conditions.

Speed Classification: Both parts must maintain fast recovery characteristics (≤500 ns at >200 mA) to preserve switching performance in rectification and protection circuits.

Operating Temperature Range: The substitute must support the -65°C ~ 150°C junction temperature range to ensure reliability across the intended operating environment.

Mounting Type & Package: Surface mount configuration is required. Physical package compatibility must be verified during PCB layout integration.

Environmental Compliance: MSL rating of 1 (Unlimited) is maintained across substitutes to ensure consistent moisture handling during storage and assembly.

The BAV23-7 manufactured by Diodes Incorporated meets all substitution criteria with enhanced electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

Electrical Compatibility: The BAV23-7 substitute provides superior electrical performance with 200 V reverse voltage rating (67% higher than CMLD4448 TR) and 400 mA current rating (60% higher). These enhanced ratings ensure the substitute operates within safe design margins for the original application.

Product Status Advantage: The CMLD4448 TR is obsolete with no ongoing manufacturing. The BAV23-7 is active production status with 3100 pieces in current inventory, ensuring long-term availability and supply chain continuity.

Compliance & Certification: The BAV23-7 is ROHS3 compliant, meeting modern environmental and regulatory requirements. Both parts maintain MSL 1 (Unlimited) moisture sensitivity rating and REACH Unaffected status.

Package Consideration: The BAV23-7 uses TO-253-4/TO-253AA package versus the original SOT-563/SOT-666. PCB layout modification is required. Verify footprint compatibility and pinout alignment during design integration.

Performance Trade-off: The BAV23-7 exhibits 50 ns reverse recovery time compared to 4 ns for the original part. This 12.5x increase in trr may impact high-frequency switching applications. Evaluate circuit timing requirements before substitution in frequency-sensitive designs.

Frequently Asked Questions (FAQ)

Q: Can BAV23-7 directly replace CMLD4448 TR without PCB modification?

A: No. While both are 2-independent diode arrays in surface mount packages, the BAV23-7 uses TO-253-4/TO-253AA package versus the original SOT-563/SOT-666. Footprint and pinout differences require PCB layout changes. Verify pin assignments and physical dimensions before implementation.

Q: What are the key electrical advantages of BAV23-7 substitution?

A: The BAV23-7 provides 200 V reverse voltage (versus 120 V) and 400 mA current rating (versus 250 mA), offering 67% and 60% performance margins respectively. These enhancements ensure reliable operation across a wider range of circuit conditions.

Q: Is the higher reverse recovery time (50 ns vs 4 ns) a concern?

A: The 50 ns trr of BAV23-7 remains within fast recovery classification (≤500 ns). For most general-purpose rectification and protection applications, this difference is acceptable. High-frequency switching circuits (>1 MHz) should be evaluated individually for timing impact.

Q: Are there compliance or supply chain advantages?

A: Yes. The BAV23-7 is active production with 3100 pieces in inventory, versus the obsolete CMLD4448 TR. The BAV23-7 is ROHS3 compliant, meeting current environmental standards. Long-term availability and regulatory compliance favor BAV23-7 selection.

Q: What forward voltage difference exists between these parts?

A: The BAV23-7 forward voltage is 1.25 V @ 200 mA versus 1 V @ 100 mA for CMLD4448 TR. The higher measurement current (200 mA vs 100 mA) and slightly elevated Vf may increase power dissipation in high-current applications. Thermal analysis is recommended for designs operating near maximum current ratings.

Q: Can both parts be used interchangeably in new designs?

A: Only BAV23-7 should be used in new designs. The CMLD4448 TR is obsolete and unavailable. BAV23-7 is the active substitute with superior availability, compliance status, and electrical performance margins suitable for current and future production requirements.