L6004F81 Equivalent & Substitute Parts

Part Overview

The L6004F81 is a TRIAC Logic - Sensitive Gate component rated for 600 V off-state voltage and 4 A on-state current, manufactured by Littelfuse Inc. in a Through Hole TO-202 Long Tab package. This part is classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and gate trigger specifications while accommodating package and mounting differences in circuit design.

Substiute Parts

L6004F81

Littelfuse Inc.In Stock: 1175L6004F81 Datasheet

Current PartRFQ

BT136-600E,127

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the L6004F81 is based on matching the following critical electrical parameters: Triac Type (Logic - Sensitive Gate), Voltage - Off State (600 V), Current - On State maximum (4 A), and gate trigger characteristics (Vgt and Igt). The BT136-600E,127 qualifies as a substitute because it maintains these core electrical specifications. Package differences (TO-202 Long Tab versus TO-220-3) require circuit board layout modification but do not affect electrical function. Both parts are Through Hole mounted and support the same voltage and current ratings. Compliance certifications (ROHS3, EAR99, HTSUS code) are identical, confirming regulatory equivalence.

Parameter Comparison

Engineering Selection Recommendations

The BT136-600E,127 is the qualified substitute for the obsolete L6004F81 based on matching electrical specifications and regulatory compliance. Both parts are ROHS3 compliant and carry identical ECCN and HTSUS classifications. The BT136-600E,127 offers the advantage of Active product status with current manufacturing availability (16,962 pcs in stock versus 1,120 pcs for the L6004F81). The lower gate trigger voltage (1.5 V versus 2 V) of the BT136-600E,127 represents improved gate sensitivity, which is beneficial for low-power control circuits. The lower non-repetitive surge current rating (25 A, 27 A versus 33 A, 40 A) should be evaluated against circuit transient requirements. The higher maximum junction temperature rating (125°C versus 110°C) provides additional thermal margin. Package transition from TO-202 Long Tab to TO-220-3 requires PCB footprint redesign but does not affect electrical performance.

Frequently Asked Questions (FAQ)

Q: Can the BT136-600E,127 directly replace the L6004F81 without circuit modification?

A: Electrical substitution is valid; however, package differences require PCB layout modification. The TO-220-3 package has different pin spacing and mounting hole locations compared to the TO-202 Long Tab package. Gate sensitivity improvement (1.5 V versus 2 V trigger voltage) may require gate drive circuit evaluation in applications with marginal control signal levels.

Q: What is the impact of the lower gate trigger voltage in the BT136-600E,127?

A: The 1.5 V maximum gate trigger voltage (versus 2 V for the L6004F81) indicates a more sensitive gate. This reduces the gate current required for triggering and may improve performance in low-power control applications. Verify that existing gate drive circuits can reliably operate within this lower threshold.

Q: Are there thermal performance differences between these parts?

A: The BT136-600E,127 supports a maximum junction temperature of 125°C compared to 110°C for the L6004F81. This provides 15°C additional thermal margin. Both parts operate across the same ambient temperature range when properly mounted and cooled.

Q: How do the surge current ratings differ?

A: The L6004F81 supports non-repetitive surge currents of 33 A (50 Hz) and 40 A (60 Hz), while the BT136-600E,127 is rated for 25 A (50 Hz) and 27 A (60 Hz). Applications requiring higher transient current handling should verify that circuit transient levels remain within the BT136-600E,127 specification.

Q: Is the BT136-600E,127 available for procurement?

A: Yes, the BT136-600E,127 is classified as Active product status with 16,962 pcs in stock, ensuring reliable supply. The L6004F81 is Obsolete with limited remaining inventory (1,120 pcs).

Q: Do both parts meet the same regulatory requirements?

A: Yes, both the L6004F81 and BT136-600E,127 are ROHS3 compliant with identical ECCN (EAR99) and HTSUS (8541.30.0080) classifications, confirming regulatory equivalence for export and environmental compliance.