L4004V8 Equivalent & Substitute Parts

Part Overview

The L4004V8 is a Logic - Sensitive Gate TRIAC manufactured by Littelfuse Inc., rated for 400 V off-state voltage and 4 A on-state current in a Through Hole TO-251 package. This component is discontinued at DiGi Electronics, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Triac Type	Logic - Sensitive Gate
Voltage - Off State	400 V
Current - On State (It (RMS)) (Max)	4 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V
Current - Gate Trigger (Igt) (Max)	10 mA
Current - Hold (Ih) (Max)	15 mA
Operating Temperature	-40°C ~ 110°C (TJ)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the L4004V8 is determined by the following critical parameters:

Triac Type: Must be Logic - Sensitive Gate configuration
Current Rating: On-state current must be rated at or above 4 A (RMS)
Gate Trigger Characteristics: Voltage (Vgt) and current (Igt) must be compatible with existing gate drive circuitry
Hold Current (Ih): Must not exceed 15 mA to maintain circuit stability
Mounting Type: Through Hole configuration required for PCB compatibility
RoHS Compliance: ROHS3 Compliant status required for regulatory alignment

The BT134-600E,127 meets these substitution criteria with equivalent gate trigger specifications and hold current ratings, while providing higher voltage rating (600 V) and active product status.

Parameter Comparison

Parameter	L4004V8 (Main Part)	BT134-600E,127 (Substitute)
Manufacturer	Littelfuse Inc.	WeEn Semiconductors
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate
Voltage - Off State	400 V	600 V
Current - On State (It (RMS)) (Max)	4 A	4 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.5 V
Current - Gate Trigger (Igt) (Max)	10 mA	10 mA
Current - Hold (Ih) (Max)	15 mA	15 mA
Operating Temperature (TJ)	-40°C ~ 110°C	125°C
Mounting Type	Through Hole	Through Hole
Package / Case	TO-251-3 Short Leads, IPak, TO-251AA	SOT-82
Product Status	Discontinued at DiGi Electronics	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The BT134-600E,127 is a suitable substitute for the L4004V8 based on the following factors:

Both components maintain Logic - Sensitive Gate TRIAC architecture with identical on-state current rating (4 A)
Gate trigger specifications are compatible: Vgt maximum of 1.5 V versus 1.3 V, and Igt maximum of 10 mA for both
Hold current (Ih) is identical at 15 mA maximum, ensuring circuit behavior consistency
The BT134-600E,127 provides higher voltage rating (600 V versus 400 V), offering enhanced margin for overvoltage conditions
Both components are ROHS3 Compliant and carry EAR99 ECCN classification
The substitute maintains active product status with confirmed inventory availability (12526 Pcs)
Package transition from TO-251 to SOT-82 requires PCB layout verification for pin compatibility and thermal management

Frequently Asked Questions (FAQ)

Q: Can the BT134-600E,127 directly replace the L4004V8 without circuit modification?

A: The BT134-600E,127 is electrically compatible for gate drive and hold current requirements. However, the package change from TO-251 to SOT-82 requires PCB layout verification. Pin assignments and thermal dissipation characteristics must be confirmed for your specific application.

Q: What is the significance of the higher 600 V rating on the BT134-600E,127?

A: The 600 V off-state voltage rating provides additional safety margin compared to the 400 V L4004V8. This is a non-limiting factor for substitution and does not require circuit redesign if the original application was rated for 400 V operation.

Q: Are the gate trigger voltage specifications compatible?

A: Yes. The BT134-600E,127 gate trigger voltage (Vgt) maximum of 1.5 V is within acceptable tolerance of the L4004V8 specification of 1.3 V. Both components share identical gate trigger current (Igt) of 10 mA maximum and hold current (Ih) of 15 mA maximum.

Q: What is the difference between TO-251 and SOT-82 packages?

A: Both are Through Hole packages for TRIAC components. TO-251 (also called V-Pak or I-Pak) and SOT-82 differ in physical dimensions and pin layout. PCB footprint redesign is required when transitioning between these packages.

Q: Is the BT134-600E,127 available in the same packaging format?

A: The BT134-600E,127 is supplied in Tube packaging, while the L4004V8 was available in standard component packaging. Both are Through Hole mount types suitable for wave soldering and manual assembly processes.

Q: Do both components meet the same compliance standards?

A: Yes. Both the L4004V8 and BT134-600E,127 are ROHS3 Compliant with EAR99 ECCN classification. The BT134-600E,127 additionally carries REACH Affected status.

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