QK040K7 TRIAC Alternistor Equivalent & Substitute Parts

Part Overview

The QK040K7 is a snubberless TRIAC Alternistor rated for 1 kV off-state voltage and 40 A on-state current (RMS), housed in a TO-218-3 isolated tab package. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. The QK040K7TP provides a direct functional equivalent with identical electrical specifications and packaging, differing primarily in product status and packaging format.

Substiute Parts

QK040K7

Littelfuse Inc.In Stock: 3348QK040K7 Datasheet

Current PartRFQ

QK040K7TP

Littelfuse Inc.In Stock: 830QK040K7TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the QK040K7 is determined by strict equivalence across the following critical parameters:

• Voltage rating (1 kV off-state)
• Current rating (40 A on-state RMS)
• Gate trigger specifications (Vgt ≤ 2 V, Igt ≤ 100 mA)
• Hold current (Ih ≤ 100 mA)
• Surge current capability (335 A / 400 A at 50/60 Hz)
• Package type (TO-218-3 isolated tab)
• Triac classification (Alternistor - Snubberless)
• Operating temperature range (-40°C to 125°C)

The QK040K7TP meets all these criteria and is classified as an active product, making it a direct substitute for the obsolete QK040K7.

Parameter Comparison

Engineering Selection Recommendations

The QK040K7TP is the direct equivalent for the obsolete QK040K7. Both parts are manufactured by Littelfuse Inc. and share identical electrical and thermal specifications. The QK040K7TP carries active product status, ensuring continued availability and supply chain support. Both parts maintain ROHS3 compliance and EAR99 export classification. The primary distinction is packaging format: QK040K7TP is supplied in tube packaging, whereas the original QK040K7 specifications do not specify packaging detail. For new designs or component replacement, the QK040K7TP is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Can QK040K7TP be used as a direct replacement for QK040K7?

A: Yes. The QK040K7TP is electrically and mechanically identical to the QK040K7. Both are snubberless TRIAC Alternistors with 1 kV voltage rating, 40 A on-state current, and TO-218-3 isolated tab packaging. The QK040K7TP is the active equivalent.

Q: What is the difference between QK040K7 and QK040K7TP?

A: The primary difference is product status. QK040K7 is obsolete, while QK040K7TP is active. QK040K7TP is supplied in tube packaging. All electrical parameters, thermal ratings, and compliance certifications are identical.

Q: Are there any package compatibility concerns?

A: No. Both parts use the TO-218-3 isolated tab package with through-hole mounting. PCB layouts and thermal management designs are fully compatible.

Q: What compliance certifications apply to both parts?

A: Both QK040K7 and QK040K7TP are ROHS3 compliant, carry EAR99 export classification, and have MSL rating of 1 (unlimited moisture sensitivity). HTSUS code is 8541.30.0080 for both.

Q: Is the QK040K7TP suitable for the same operating temperature range?

A: Yes. Both parts operate across -40°C to 125°C junction temperature range, making them suitable for identical thermal environments.