L2004F81 Equivalent & Substitute Parts

Part Overview

The L2004F81 is a TRIAC with Logic - Sensitive Gate configuration rated for 200 V off-state voltage and 4 A on-state current in a Through Hole TO-202 package. This component is classified as Obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. The sensitive gate design enables low-voltage triggering suitable for control applications requiring minimal gate drive power.

Substiute Parts

L2004F81

Littelfuse Inc.In Stock: 5722L2004F81 Datasheet

Current PartRFQ

BT136-600E,127

WeEn SemiconductorsIn Stock: 17021BT136-600E,127 Datasheet

MFR RecommendedRFQ

TS420-600T

STMicroelectronicsIn Stock: 2704TS420-600T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the L2004F81 is determined by the following critical parameters:

• Device Type: Logic - Sensitive Gate TRIAC configuration
• Current Rating: 4 A on-state RMS current
• Gate Sensitivity: Maximum gate trigger voltage and current specifications
• Hold Current: Minimum holding current to maintain conduction
• Mounting: Through Hole technology
• Compliance: ROHS3 compliance and EAR99 classification

The substitute parts identified (BT136-600E,127 and TS420-600T) maintain functional equivalence through matching gate sensitivity characteristics and current ratings. Both substitutes are Active products with current manufacturing support, addressing the obsolescence of the L2004F81. Package differences (TO-220AB vs. TO-202) require mechanical redesign consideration but do not affect electrical functionality within the specified parameter ranges.

Parameter Comparison

Engineering Selection Recommendations

BT136-600E,127 (WeEn Semiconductors): This TRIAC substitute maintains identical on-state current rating (4 A) and gate sensitivity specifications (10 mA maximum gate trigger current). The 600 V off-state voltage rating provides enhanced voltage margin over the original 200 V specification. Active product status ensures long-term availability and manufacturing support. TO-220AB package requires PCB layout modification but offers improved thermal performance through larger lead frame geometry.

TS420-600T (STMicroelectronics): This SCR device differs from the original TRIAC configuration but provides equivalent gate sensitivity with lower trigger voltage (800 mV) and gate current (200 µA). The 4 A on-state current rating matches the L2004F81 specification. Active product status with extended temperature range (-40°C to 125°C) supports demanding applications. Note: SCR operation differs from TRIAC operation; circuit topology must accommodate unidirectional conduction characteristics.

Both substitutes carry ROHS3 compliance and EAR99 classification, maintaining regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can the BT136-600E,127 directly replace the L2004F81 without circuit modification?

A: Electrical substitution is valid within the specified parameter ranges. The 600 V voltage rating is backward-compatible with 200 V applications. Package change from TO-202 to TO-220AB requires PCB footprint redesign and thermal management evaluation.

Q: What is the primary difference between the BT136-600E,127 and TS420-600T substitutes?

A: The BT136-600E,127 is a TRIAC (bidirectional thyristor) matching the original device type. The TS420-600T is an SCR (unidirectional thyristor) with lower gate trigger specifications. TRIAC applications require bidirectional current control; SCR applications require unidirectional current control. Circuit topology determines which substitute is appropriate.

Q: Are there thermal performance differences between TO-202 and TO-220 packages?

A: TO-220 packages provide larger lead frame geometry and improved thermal coupling to PCB copper areas. Applications requiring thermal dissipation above 1 W benefit from TO-220 package thermal characteristics. Detailed thermal analysis is required for specific application conditions.

Q: Do all substitutes maintain the same gate sensitivity?

A: Gate sensitivity differs across substitutes. The L2004F81 specifies 2 V maximum gate trigger voltage and 10 mA maximum gate trigger current. The BT136-600E,127 matches these specifications exactly. The TS420-600T provides enhanced sensitivity with 800 mV gate trigger voltage and 200 µA gate trigger current, requiring gate drive circuit evaluation.

Q: What compliance certifications apply to these substitutes?

A: All three components (L2004F81, BT136-600E,127, and TS420-600T) carry ROHS3 compliance and EAR99 classification, maintaining regulatory alignment for industrial and consumer applications.