QJ8012NH5RP TRIAC Alternistor Equivalent & Substitute Parts

Part Overview

The QJ8012NH5RP is an 800V, 12A snubberless TRIAC alternistor manufactured by Littelfuse Inc., designed for surface mount applications in TO-263AB (D2PAK) packaging. This component is classified as active and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and thermal operating ranges to ensure direct functional replacement in circuit designs.

Substiute Parts

QJ8012NH5RP

Littelfuse Inc.In Stock: 775QJ8012NH5RP Datasheet

Current PartRFQ

QJ8012NH4RP

Littelfuse Inc.In Stock: 1341QJ8012NH4RP Datasheet

Parametric EquivalentRFQ

T1235T-8G-TR

STMicroelectronicsIn Stock: 1312T1235T-8G-TR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the QJ8012NH5RP are qualified based on the following critical parameters:

• Voltage - Off State: 800 V (exact match required)
• Current - On State (It (RMS)) (Max): 12 A (exact match required)
• Voltage - Gate Trigger (Vgt) (Max): 1.3 V (exact match required)
• Current - Gate Trigger (Igt) (Max): 35 mA (exact match required)
• Current - Hold (Ih) (Max): 40 mA (exact match required)
• Operating Temperature Range: -40°C to 150°C (TJ) (exact match required)
• Package / Case: TO-263-3, D2PAK (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Triac Type: Alternistor - Snubberless (exact match required)
• Configuration: Single (exact match required)

Parts meeting all these criteria are classified as parametric equivalents and direct functional substitutes.

Parameter Comparison

Engineering Selection Recommendations

QJ8012NH4RP (Littelfuse Inc.) is a parametric equivalent with identical electrical and mechanical specifications to the QJ8012NH5RP. Both parts share the same base product number (QJ8012xHx series), package configuration, and performance characteristics. Selection between these two Littelfuse variants is based on inventory availability and supply chain considerations.

T1235T-8G-TR (STMicroelectronics) is a parametric equivalent that meets all critical electrical specifications and package requirements. The non-repetitive surge current rating (Itsm) differs at 95A and 90A compared to 110A and 120A for the Littelfuse variants; however, this parameter does not affect functional substitution for standard operating conditions. All three parts are ROHS3 compliant, REACH unaffected, and maintain identical thermal operating ranges and gate trigger characteristics.

Frequently Asked Questions (FAQ)

Q: Can QJ8012NH4RP be used as a direct replacement for QJ8012NH5RP?

A: Yes. Both parts are from the same Littelfuse QJ8012xHx series and share identical electrical specifications, gate trigger voltages, holding currents, and thermal operating ranges. The TO-263AB (D2PAK) package configuration is identical, enabling direct PCB substitution.

Q: What is the difference between the Littelfuse QJ8012NH5RP and the STMicroelectronics T1235T-8G-TR?

A: The primary difference is the non-repetitive surge current rating (Itsm). The Littelfuse part is rated at 110A and 120A (50Hz and 60Hz), while the STMicroelectronics part is rated at 95A and 90A. All other electrical parameters, including voltage, on-state current, gate trigger specifications, and thermal range, are identical. Both parts use the same D2PAK package.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the TO-263-3 (D2PAK) package with 2 leads plus tab configuration, ensuring mechanical and electrical pin compatibility on the PCB.

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

A: Yes. QJ8012NH5RP, QJ8012NH4RP, and T1235T-8G-TR are all ROHS3 compliant, REACH unaffected, and classified as active products with MSL 1 (unlimited moisture sensitivity level).

Q: Can the T1235T-8G-TR be used in applications requiring the full 110A/120A surge rating?

A: The T1235T-8G-TR is rated for 95A and 90A non-repetitive surge current. Applications requiring the full 110A/120A surge capability should use QJ8012NH5RP or QJ8012NH4RP to ensure compliance with design specifications.