CSTB567 BK Equivalent & Substitute Parts

Part Overview

The CSTB567 BK is a general-purpose rectifier diode manufactured by Central Semiconductor Corp, housed in a DO-35 axial through-hole package. This component is rated for 10mA average rectified current with a maximum forward voltage of 1.61V at 10mA, classified as a small-signal diode suitable for standard rectification applications.

The CSTB567 BK carries an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance and repairs.

Substiute Parts

CSTB567 BK

Central Semiconductor CorpIn Stock: 979CSTB567 BK Datasheet

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CMXSTB200 TR

Central Semiconductor CorpIn Stock: 789CMXSTB200 TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the CSTB567 BK is determined by the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Current rating: The substitute must support the required 10mA average rectified current or higher
• Voltage rating: The substitute must accommodate the circuit's reverse voltage requirements
• Forward voltage characteristics: The substitute's forward voltage drop must be compatible with circuit design specifications
• Speed classification: Small-signal diode classification ensures compatibility with switching and rectification applications
• Technology: Standard silicon diode technology maintains functional equivalence

Secondary Considerations:

• Mounting type and package form factor affect physical integration
• Operating temperature range supports the intended application environment
• Compliance certifications (ECCN, HTSUS) ensure regulatory alignment

The CMXSTB200 TR is identified as a substitute part based on its standard silicon diode technology, small-signal speed classification, and current rating that exceeds the CSTB567 BK requirement. However, the CMXSTB200 TR employs surface-mount packaging (SOT-23-6) rather than through-hole axial configuration, representing a form-factor change that requires circuit board redesign.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The CSTB567 BK is classified as obsolete, making the CMXSTB200 TR an active-status alternative from the same manufacturer. Active product status ensures ongoing availability, manufacturing support, and compliance with current regulatory standards.

Compliance Alignment: Both parts carry ECCN classification EAR99, confirming equivalent export control treatment. The CMXSTB200 TR maintains REACH compliance status as unaffected, supporting use in regulated markets.

Electrical Compatibility: The CMXSTB200 TR exceeds the current rating of the CSTB567 BK (100mA versus 10mA per diode), providing operational margin in rectification applications. The forward voltage increase (1.94V at 100mA versus 1.61V at 10mA) reflects the higher current rating and must be evaluated against circuit voltage budgets.

Form Factor Impact: The transition from through-hole axial (DO-35) to surface-mount (SOT-23-6) packaging requires circuit board redesign and assembly process modification. This substitution is suitable for new designs or board revisions but not for direct socket replacement in existing through-hole layouts.

Frequently Asked Questions (FAQ)

Q: Can the CMXSTB200 TR directly replace the CSTB567 BK in an existing circuit board?

A: No. The CSTB567 BK uses through-hole axial packaging (DO-35), while the CMXSTB200 TR uses surface-mount packaging (SOT-23-6). Direct replacement requires circuit board redesign and assembly process changes.

Q: What is the significance of the current rating difference between these parts?

A: The CSTB567 BK is rated for 10mA average rectified current, while the CMXSTB200 TR is rated for 100mA per diode. The higher rating in the substitute part provides operational margin and supports applications with increased current demands. However, the circuit design must accommodate the higher forward voltage characteristic.

Q: Are there electrical compatibility concerns when substituting the CMXSTB200 TR?

A: The forward voltage of the CMXSTB200 TR (1.94V @ 100mA) is higher than the CSTB567 BK (1.61V @ 10mA). Circuit designs with tight voltage budgets must account for this difference. The CMXSTB200 TR's higher current rating makes it suitable for applications requiring greater current capacity.

Q: Why is the CSTB567 BK classified as obsolete?

A: Obsolete status indicates that the manufacturer has discontinued production. Identifying active substitute parts ensures continued access to equivalent functionality and maintains design continuity for legacy system support.

Q: What compliance certifications apply to both parts?

A: Both the CSTB567 BK and CMXSTB200 TR carry EAR99 export control classification. The CMXSTB200 TR maintains REACH compliance status as unaffected, supporting regulatory requirements in applicable markets.

Q: How does the diode configuration of the CMXSTB200 TR affect substitution?

A: The CMXSTB200 TR is configured as a 1 Pair Series Connection diode array in a single package. Circuit integration requires evaluation of the series connection topology against the single-diode configuration of the CSTB567 BK.