CQD-4M BK Equivalent & Substitute Parts

Part Overview

The CQD-4M BK is a Logic-Sensitive Gate TRIAC rated for 600V off-state voltage and 4A on-state current in a Surface Mount DPAK package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility across voltage rating, current capacity, gate trigger characteristics, and package configuration to ensure functional equivalence in circuit applications.

Substiute Parts

CQD-4M BK

Central Semiconductor CorpIn Stock: 799CQD-4M BK Datasheet

Current PartRFQ

BT137S-600E,118

WeEn SemiconductorsIn Stock: 23197BT137S-600E,118 Datasheet

MFR RecommendedRFQ

L6004D3RP

Littelfuse Inc.In Stock: 4260L6004D3RP Datasheet

MFR RecommendedRFQ

L6004D3TP

Littelfuse Inc.In Stock: 1050L6004D3TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CQD-4M BK is determined by the following critical parameters:

Primary Substitution Criteria:

• Triac Type: Logic - Sensitive Gate configuration
• Voltage - Off State: 600V minimum rating
• Current - On State: Equal to or greater than 4A
• Package / Case: TO-252-3 DPAK (2 Leads + Tab) SC-63
• Mounting Type: Surface Mount
• Configuration: Single

Secondary Compatibility Parameters:

• Voltage - Gate Trigger (Vgt): Must not exceed 1.75V maximum
• Current - Gate Trigger (Igt): Must not exceed 5mA maximum
• Current - Hold (Ih): Must not exceed 5mA maximum
• Operating Temperature Range: Must support -40°C to 125°C minimum
• Moisture Sensitivity Level: MSL 1 (Unlimited)

Parts meeting these criteria are electrically and mechanically compatible for direct substitution in applications designed for the CQD-4M BK.

Parameter Comparison

Engineering Selection Recommendations

BT137S-600E,118 (WeEn Semiconductors): This part is active in production with higher current capacity (8A) and improved surge current rating (65A, 71A). Gate trigger voltage is lower at 1.5V, meeting the 1.75V maximum requirement. However, gate trigger current (10mA) and hold current (20mA) exceed the CQD-4M BK specifications. Operating temperature range is limited to 125°C maximum without lower temperature specification. This part provides electrical headroom for applications with higher current demands but requires circuit validation for gate drive compatibility.

L6004D3RP (Littelfuse Inc., Tape & Reel): This part maintains exact current rating (4A) and matches the CQD-4M BK across all critical parameters. Gate trigger voltage (1.3V) and current (3mA) are superior to the original specification. Operating temperature range extends to -40°C to 110°C, providing adequate coverage for most applications. RoHS3 compliance and REACH Unaffected status support regulatory requirements. This part is the closest functional equivalent with active production status.

L6004D3TP (Littelfuse Inc., Tube): Identical electrical specifications to L6004D3RP with equivalent performance characteristics. Packaging differs only in form factor (Tube versus Tape & Reel). RoHS3 compliance and REACH Unaffected status are maintained. Selection between L6004D3RP and L6004D3TP depends on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can BT137S-600E,118 be used as a direct replacement for CQD-4M BK?

A: BT137S-600E,118 meets the core substitution criteria of 600V voltage rating, DPAK package, and Logic-Sensitive Gate configuration. However, gate trigger current (10mA) and hold current (20mA) exceed CQD-4M BK maximums (5mA each). Circuit validation is required to confirm gate drive circuit compatibility before implementation.

Q: What is the difference between L6004D3RP and L6004D3TP?

A: Both parts are electrically identical with matching 600V, 4A, and DPAK specifications. The difference is packaging format: L6004D3RP is supplied in Tape & Reel (TR) format for automated assembly, while L6004D3TP is supplied in Tube format for manual handling. Selection depends on assembly process requirements.

Q: Are the substitute parts RoHS compliant?

A: L6004D3RP and L6004D3TP are both ROHS3 Compliant with REACH Unaffected status. BT137S-600E,118 compliance status is not specified in available documentation.

Q: What is the operating temperature range for each substitute?

A: CQD-4M BK operates from -40°C to 125°C. L6004D3RP and L6004D3TP operate from -40°C to 110°C, providing adequate coverage for most applications. BT137S-600E,118 specifies 125°C maximum without lower temperature specification.

Q: Can I use a higher current rated part like BT137S-600E,118 in place of the 4A CQD-4M BK?

A: Higher current rating provides design margin but does not guarantee compatibility. The BT137S-600E,118 has different gate trigger and hold current specifications that may affect circuit behavior. Circuit-level analysis is required to confirm suitability.

Q: What packaging considerations apply to these substitutes?

A: All substitute parts use identical TO-252-3 DPAK (2 Leads + Tab) SC-63 package with Surface Mount configuration. PCB layout and assembly processes remain unchanged. Packaging format (Tape & Reel versus Tube) affects procurement and assembly handling only.