L2004L8 Equivalent & Substitute Parts

Part Overview

The L2004L8 is a logic-sensitive gate TRIAC manufactured by Littelfuse Inc., rated for 200 V off-state voltage and 4 A on-state current in a TO-220 isolated tab package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations. The part operates across a temperature range of -40°C to 110°C and is RoHS3 compliant.

Key Parameters

Parameter	L2004L8 Specification
Triac Type	Logic - Sensitive Gate
Voltage - Off State	200 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
Package / Case	TO-220-3 Isolated Tab
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the L2004L8 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: Vgt and Igt parameters must be compatible with existing gate drive circuitry
Hold Current: Must not exceed application requirements
Package Compatibility: TO-220 form factor with isolated tab configuration
Temperature Range: Must support the operating environment
Compliance: RoHS3 compliance required

The BT136X-600E,127 qualifies as a substitute based on matching the logic-sensitive gate topology, 4 A current rating, compatible gate trigger parameters, and identical package form factor. The higher voltage rating (600 V vs. 200 V) provides design margin and does not compromise functionality in 200 V applications.

Parameter Comparison

Parameter	L2004L8	BT136X-600E,127	Compatibility Notes
Manufacturer	Littelfuse Inc.	WeEn Semiconductors	Different manufacturers
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate	Matched
Voltage - Off State	200 V	600 V	Substitute rated higher; acceptable for 200 V circuits
Current - On State (It (RMS)) (Max)	4 A	4 A	Matched
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.5 V	Substitute within acceptable tolerance
Current - Gate Trigger (Igt) (Max)	10 mA	10 mA	Matched
Current - Hold (Ih) (Max)	15 mA	15 mA	Matched
Operating Temperature	-40°C ~ 110°C (TJ)	125°C (TJ)	Substitute supports higher maximum; compatible
Mounting Type	Through Hole	Through Hole	Matched
Package / Case	TO-220-3 Isolated Tab	TO-220-3 Full Pack, Isolated Tab	Pin-compatible; both isolated tab variants
Product Status	Obsolete	Active	Substitute is in active production
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Matched

Engineering Selection Recommendations

The BT136X-600E,127 is a direct functional substitute for the obsolete L2004L8. Selection is based on the following factors:

Product Status: The L2004L8 is obsolete; the BT136X-600E,127 is active and available in production quantities (4248 pcs in stock vs. 1040 pcs for the original part).
Electrical Compatibility: Both devices share identical logic-sensitive gate TRIAC topology, 4 A current rating, and gate trigger specifications. The substitute's higher voltage rating (600 V) does not degrade performance in 200 V applications.
Thermal Performance: The substitute supports a higher maximum junction temperature (125°C vs. 110°C), providing additional thermal margin.
Compliance: Both parts are RoHS3 compliant and carry identical ECCN and HTSUS classifications.
Package Compatibility: Both use TO-220-3 isolated tab packages with identical pinout and mechanical dimensions, enabling direct board-level replacement without layout modification.

Frequently Asked Questions (FAQ)

Q: Can the BT136X-600E,127 be used as a direct replacement for the L2004L8 without circuit modification?

A: Yes. Both devices are logic-sensitive gate TRIACs with identical current ratings (4 A), matching gate trigger parameters (Igt = 10 mA, Ih = 15 mA), and compatible package form factors (TO-220-3 isolated tab). The substitute's higher voltage rating does not require circuit changes for 200 V applications.

Q: What is the significance of the higher voltage rating on the BT136X-600E,127?

A: The substitute is rated for 600 V off-state voltage compared to the original 200 V rating. This provides additional voltage margin and does not compromise functionality in circuits designed for 200 V operation. The device will operate safely at or below its rated voltage.

Q: Are there any thermal considerations when substituting the BT136X-600E,127?

A: The substitute supports a higher maximum junction temperature (125°C vs. 110°C). This provides additional thermal headroom and is beneficial for applications operating near temperature limits. No thermal derating is required.

Q: Is the package footprint identical between the two parts?

A: Yes. Both the L2004L8 and BT136X-600E,127 use TO-220-3 isolated tab packages with identical pinout and mechanical dimensions. No PCB layout changes are necessary for substitution.

Q: What is the availability status of the substitute part?

A: The BT136X-600E,127 is in active production with 4248 units in stock, compared to 1040 units for the obsolete L2004L8. The substitute offers superior long-term availability.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the L2004L8 and BT136X-600E,127 are RoHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8541.30.0080) classifications.

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