CSL05 BK Equivalent & Substitute Parts

Part Overview

The CSL05 BK is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Central Semiconductor Corp, designed for surface mount applications in the SOT-23 package. This component features a 5V reverse standoff voltage with a 12V maximum clamping voltage and 17A peak pulse current rating (8/20µs). The CSL05 BK is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement.

Substiute Parts

CSL05 BK

Central Semiconductor CorpIn Stock: 964CSL05 BK Datasheet

Current PartRFQ

SM05T1G

onsemiIn Stock: 85226SM05T1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete CSL05 BK is based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Reverse standoff voltage: 5V nominal
• Breakdown voltage minimum: 6V or higher
• Peak pulse current: 17A (8/20µs) or greater
• Unidirectional configuration: 2 channels
• Package compatibility: SOT-23 / TO-236-3

Mechanical Compatibility Criteria:

• Surface mount technology
• SOT-23-3 package footprint
• Moisture sensitivity level: 1 (Unlimited)

The SM05T1G from onsemi meets these substitution criteria with compatible electrical ratings and identical package specifications, enabling direct replacement in existing PCB designs.

Parameter Comparison

Engineering Selection Recommendations

The SM05T1G is the recommended substitute for the obsolete CSL05 BK based on the following factors:

Product Status: The SM05T1G maintains active production status with onsemi, ensuring long-term availability and supply chain continuity compared to the obsolete CSL05 BK.

Compliance & Certifications: The SM05T1G is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component procurement.

Electrical Compatibility: Both devices share identical reverse standoff voltage (5V), peak pulse current (17A at 8/20µs), and unidirectional channel configuration (2 channels). The SM05T1G clamping voltage of 9.8V is lower than the CSL05 BK at 12V, providing improved transient suppression performance in applications where lower clamping voltage is acceptable.

Package & Thermal Performance: Identical SOT-23-3 package specifications enable direct PCB footprint compatibility. The SM05T1G offers an extended operating temperature range (-55°C to 150°C) compared to the CSL05 BK (-50°C to 125°C), providing greater thermal margin in demanding environments.

Frequently Asked Questions (FAQ)

Q: Can the SM05T1G directly replace the CSL05 BK without PCB modifications?

A: Yes. Both devices use identical SOT-23-3 package specifications (TO-236-3, SC-59), enabling direct footprint compatibility without PCB layout changes.

Q: What is the significance of the lower clamping voltage in the SM05T1G (9.8V vs. 12V)?

A: The SM05T1G provides lower clamping voltage, which results in more aggressive transient suppression. This is beneficial in most applications but must be verified against circuit requirements to ensure the lower clamping voltage does not interfere with normal circuit operation.

Q: Are there any thermal performance differences between these devices?

A: The SM05T1G supports an extended operating temperature range (-55°C to 150°C) versus the CSL05 BK (-50°C to 125°C). Both devices maintain MSL 1 (Unlimited) moisture sensitivity ratings, indicating equivalent moisture handling characteristics.

Q: What is the difference in peak pulse power rating between these devices?

A: The CSL05 BK is rated at 400W peak pulse power, while the SM05T1G is rated at 300W. In applications approaching these power limits, thermal analysis is required to confirm the SM05T1G meets design requirements.

Q: Is the SM05T1G RoHS compliant?

A: Yes. The SM05T1G is ROHS3 compliant and REACH unaffected, meeting current environmental regulations for electronic component manufacturing and procurement.