CSL05D BK Equivalent & Substitute Parts

Part Overview

The CSL05D BK is a 5V Zener Transient Voltage Suppressor (TVS) diode manufactured by Central Semiconductor Corp, designed for surface mount applications in SOT-23 packaging. This bidirectional TVS diode provides transient overvoltage protection with a 12V clamping voltage and 17A peak pulse current rating (8/20µs).

The CSL05D BK is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Substiute Parts

CSL05D BK

Central Semiconductor CorpIn Stock: 1058CSL05D BK Datasheet

Current PartRFQ

SM05T1G

onsemiIn Stock: 85226SM05T1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CSL05D BK is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff: 5V nominal rating
• Voltage - Breakdown (Min): 6V or higher
• Voltage - Clamping (Max) @ Ipp: Must not exceed 12V to maintain circuit protection integrity
• Current - Peak Pulse (10/1000µs): 17A minimum to handle transient events
• Package / Case: SOT-23-3 (TO-236) for mechanical and thermal compatibility
• Mounting Type: Surface Mount for PCB integration

The SM05T1G from onsemi meets these substitution criteria with compatible electrical characteristics and identical package specifications.

Parameter Comparison

Engineering Selection Recommendations

The SM05T1G is a direct functional substitute for the obsolete CSL05D BK. Both devices share identical package specifications (SOT-23-3), peak pulse current ratings (17A at 8/20µs), and moisture sensitivity classifications.

The SM05T1G offers the following advantages for new designs and production:

• Active product status ensures long-term availability and supply chain stability
• ROHS3 compliance meets current environmental and regulatory requirements
• Extended operating temperature range (-55°C ~ 150°C) provides broader thermal performance
• Lower clamping voltage (9.8V vs. 12V) delivers improved transient suppression efficiency

The SM05T1G is suitable for direct replacement in applications where the CSL05D BK was originally specified, provided circuit design parameters accommodate the lower clamping voltage and reduced peak pulse power rating (300W vs. 400W).

Frequently Asked Questions (FAQ)

Q: Can the SM05T1G directly replace the CSL05D BK in existing designs?

A: Yes. Both devices share identical SOT-23-3 package specifications, reverse standoff voltage (5V), breakdown voltage (6V minimum), and peak pulse current (17A). The SM05T1G's lower clamping voltage (9.8V) provides enhanced protection margins in most applications.

Q: What is the difference between bidirectional and unidirectional TVS diodes?

A: The CSL05D BK is bidirectional (protects both positive and negative transients), while the SM05T1G is unidirectional (protects in one direction only). Circuit topology determines which configuration is required. Verify your application's protection requirements before substitution.

Q: Does the lower peak pulse power rating of the SM05T1G affect compatibility?

A: The SM05T1G's 300W peak pulse power rating is lower than the CSL05D BK's 400W rating. Applications with transient energy levels below 300W are fully compatible. For applications requiring the full 400W capacity, verify that transient energy does not exceed the SM05T1G specification.

Q: Are there any compliance or certification differences?

A: The SM05T1G carries ROHS3 compliance certification, meeting current environmental standards. Both devices share identical MSL ratings (1 - Unlimited) and ECCN classifications (EAR99).

Q: What is the impact of the extended operating temperature range?

A: The SM05T1G operates from -55°C to 150°C, compared to the CSL05D BK's -50°C to 125°C range. This extended range provides additional thermal margin for applications in extreme environments and improves long-term reliability in high-temperature conditions.