L2004D8TP Equivalent & Substitute Parts

Part Overview

The L2004D8TP is a Logic-Sensitive Gate TRIAC manufactured by Littelfuse Inc., rated for 200V off-state voltage and 4A on-state current in a Surface Mount TO-252 (DPAK) package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. Substitute TRIACs in this category maintain identical gate sensitivity characteristics and package form factor while offering enhanced voltage ratings or active product status.

Substiute Parts

L2004D8TP

Littelfuse Inc.In Stock: 851L2004D8TP Datasheet

Current PartRFQ

L4004D8TP

Littelfuse Inc.In Stock: 903L4004D8TP Datasheet

UpgradeRFQ

L6004D8TP

LittelfuseIn Stock: 917L6004D8TP Datasheet

UpgradeRFQ

T405Q-600B-TR

STMicroelectronicsIn Stock: 50372T405Q-600B-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the L2004D8TP is determined by the following criteria:

Mandatory Compatibility Parameters:

• Triac Type: Logic - Sensitive Gate (identical gate sensitivity required)
• Current - On State (It (RMS)) (Max): 4 A (minimum requirement)
• Voltage - Gate Trigger (Vgt) (Max): 1.3 V (gate drive compatibility)
• Package / Case: TO-252-3, DPAK (identical PCB footprint and thermal characteristics)
• Mounting Type: Surface Mount (assembly process compatibility)

Allowable Variation Parameters:

• Voltage - Off State: 200V or higher (higher voltage ratings provide design margin and are electrically compatible in 200V applications)
• Current - Gate Trigger (Igt) (Max): 10 mA or lower (lower gate current reduces driver load)
• Current - Hold (Ih) (Max): 15 mA or lower (lower hold current improves circuit efficiency)
• Operating Temperature: -40°C minimum and 110°C or higher maximum (thermal envelope compatibility)
• Product Status: Active preferred for long-term availability

Substitute parts L4004D8TP, L6004D8TP, and T405Q-600B-TR meet all mandatory parameters and provide enhanced specifications within allowable variation ranges.

Parameter Comparison

Engineering Selection Recommendations

L4004D8TP (Littelfuse Inc., Active Status) Recommended as a direct upgrade within the Littelfuse product line. Maintains identical gate sensitivity and current ratings while increasing off-state voltage to 400V. Active product status ensures long-term availability and supply chain continuity. Identical operating temperature range and package specifications enable direct PCB substitution.

L6004D8TP (Littelfuse, Active Status) Recommended for applications requiring maximum voltage margin. Provides 600V off-state rating with identical gate sensitivity and current specifications. Active product status and ROHS3 compliance support long-term design support. Identical thermal and package characteristics enable direct substitution.

T405Q-600B-TR (STMicroelectronics, Active Status) Manufacturer-recommended alternative from STMicroelectronics. Meets all mandatory compatibility parameters with enhanced specifications: lower gate trigger current (5 mA vs. 10 mA) and lower hold current (10 mA vs. 15 mA) reduce driver circuit load. Extended operating temperature range (-40°C to 125°C) provides additional thermal margin. Active product status and ROHS3 compliance ensure procurement continuity. Cut Tape and Digi-Reel packaging options support high-volume manufacturing.

Frequently Asked Questions (FAQ)

Q: Can L4004D8TP, L6004D8TP, or T405Q-600B-TR be used as direct replacements for L2004D8TP on existing PCBs?

A: Yes. All three substitute parts share identical TO-252-3 DPAK package geometry, pin configuration, and thermal characteristics. No PCB layout modifications are required. Gate sensitivity (Vgt = 1.3V maximum) and on-state current rating (4A) are identical, ensuring circuit behavior compatibility.

Q: What is the primary difference between the three substitute options?

A: The primary difference is off-state voltage rating: L4004D8TP provides 400V, while L6004D8TP and T405Q-600B-TR provide 600V. All maintain identical 4A on-state current and 1.3V gate trigger voltage. T405Q-600B-TR additionally offers lower gate trigger current (5 mA) and extended operating temperature range (to 125°C).

Q: Why would I select a higher voltage-rated TRIAC if my application only requires 200V?

A: Higher voltage ratings provide design margin against transient overvoltages and improve long-term reliability. L4004D8TP (400V) and L6004D8TP/T405Q-600B-TR (600V) are electrically compatible in 200V applications and offer enhanced robustness without circuit modification.

Q: Are there any differences in gate drive requirements between these parts?

A: T405Q-600B-TR requires lower gate trigger current (5 mA maximum vs. 10 mA for Littelfuse parts) and lower hold current (10 mA vs. 15 mA). This reduces driver circuit load and may improve overall system efficiency. Existing gate drive circuits designed for 10 mA gate trigger current remain compatible.

Q: What is the significance of "Logic - Sensitive Gate" classification?

A: Logic-Sensitive Gate TRIACs are designed for direct gate drive from logic-level circuits (TTL, CMOS) without additional gate drive amplification. The 1.3V maximum gate trigger voltage and 10 mA (or lower) gate trigger current enable direct interfacing with standard logic outputs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. L2004D8TP, L4004D8TP, L6004D8TP, and T405Q-600B-TR are all ROHS3 compliant, meeting environmental and regulatory requirements for commercial and industrial applications.

Q: What packaging options are available for high-volume procurement?

A: L4004D8TP and L6004D8TP are supplied in Tube packaging. T405Q-600B-TR is available in Cut Tape (CT) and Digi-Reel packaging, supporting automated assembly processes and high-volume manufacturing workflows.