Q8012NH5TP TRIAC Alternistor 800V 12A Equivalent & Substitute Parts

Part Overview

The Q8012NH5TP is an 800V 12A TRIAC Alternistor manufactured by Littelfuse Inc. in a Surface Mount TO-263 (D2PAK) package. This snubberless thyristor is designed for AC switching applications requiring high voltage isolation and moderate current handling. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits selection from qualified alternatives meeting identical or enhanced electrical specifications.

Substiute Parts

Q8012NH5TP

Littelfuse Inc.In Stock: 998Q8012NH5TP Datasheet

Current PartRFQ

T1210-800G-TR

STMicroelectronicsIn Stock: 1464T1210-800G-TR Datasheet

MFR RecommendedRFQ

T1235-800G-TR

STMicroelectronicsIn Stock: 1660T1235-800G-TR Datasheet

MFR RecommendedRFQ

T2535-800G

STMicroelectronicsIn Stock: 1266T2535-800G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Q8012NH5TP is determined by the following critical parameters:

Primary Matching Criteria:

• Voltage - Off State: 800V (exact match required)
• Current - On State (It (RMS)): 12A minimum
• Package / Case: TO-263-3, D2PAK (mechanical and thermal compatibility)
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C to 125°C (TJ)

Secondary Compatibility Factors:

• Voltage - Gate Trigger (Vgt) (Max): 1.3V or lower
• RoHS3 Compliance and REACH Unaffected status
• Configuration: Single

The substitute parts listed below meet or exceed these criteria. Parts with identical current ratings (12A) provide direct functional replacement. Parts with higher current ratings (25A) provide enhanced capability for applications with potential current margin requirements.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Preferred for Pin-Compatible Replacement):

T1235-800G-TR is the closest functional equivalent to Q8012NH5TP. Both devices are Alternistor - Snubberless types with identical voltage and current ratings, matching gate trigger voltage specifications, and equivalent surge current handling. Both maintain RoHS3 compliance and unlimited moisture sensitivity rating. This part provides direct substitution with no circuit redesign required.

Alternative with Enhanced Gate Sensitivity:

T1210-800G-TR offers superior gate sensitivity (10mA trigger current vs. 50mA) while maintaining 800V 12A electrical specifications. This Logic - Sensitive Gate variant reduces gate drive requirements and may improve circuit reliability in applications with marginal gate drive signals. Package compatibility and thermal characteristics remain identical.

Higher Current Capability Option:

T2535-800G provides 25A on-state current capacity within the same TO-263 D2PAK package. This Alternistor - Snubberless variant is suitable for applications where current margin enhancement is beneficial or where future design scaling is anticipated. All voltage and temperature specifications remain equivalent to the primary part.

All substitute parts maintain active product status, full RoHS3 compliance, and REACH Unaffected designation, ensuring regulatory and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can T1210-800G-TR replace Q8012NH5TP in existing designs without modification?

A: T1210-800G-TR is electrically compatible with identical 800V and 12A ratings. However, it is a Logic - Sensitive Gate type versus the Alternistor - Snubberless type of the original part. The lower gate trigger current (10mA vs. 50mA) may require gate drive circuit evaluation. Package and pinout are identical (TO-263 D2PAK), permitting direct PCB substitution.

Q: What is the difference between Alternistor - Snubberless and Logic - Sensitive Gate TRIAC types?

A: Alternistor - Snubberless types are optimized for applications requiring snubber-free operation with standard gate drive requirements. Logic - Sensitive Gate types feature lower gate trigger current thresholds, enabling operation with reduced gate drive power. Both types operate at identical voltage and current ratings when specified equivalently.

Q: Is T2535-800G suitable as a drop-in replacement for 12A applications?

A: T2535-800G is mechanically and thermally compatible (TO-263 D2PAK package, -40 to 125°C operating range). The 25A on-state current rating exceeds the 12A requirement, providing additional current margin. No circuit modification is required for direct substitution. Verify that the higher current capability does not introduce unintended thermal or protection circuit interactions in the application.

Q: Are all substitute parts available in the same packaging options as Q8012NH5TP?

A: Q8012NH5TP is supplied in Tube packaging. T1210-800G-TR is available in Cut Tape (CT) & Digi-Reel® packaging. T1235-800G-TR is available in Cut Tape (CT) & Digi-Reel® packaging. T2535-800G is supplied in Tube packaging. Packaging format does not affect electrical or mechanical compatibility; it affects only component handling and storage logistics.

Q: Do all substitute parts meet the same compliance standards as the original part?

A: Yes. All listed substitute parts maintain RoHS3 compliance, REACH Unaffected status, and unlimited moisture sensitivity rating (MSL 1), matching the regulatory profile of Q8012NH5TP.

Q: What is the primary reason to select T1235-800G-TR over other substitutes?

A: T1235-800G-TR provides the closest functional match to Q8012NH5TP. Both are Alternistor - Snubberless types with identical electrical specifications, gate trigger voltage, and hold current characteristics. This part minimizes design risk when direct substitution is required.