L2004F51 TRIAC Equivalent & Substitute Parts

Part Overview

The L2004F51 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-202 through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Key Parameters

Parameter	L2004F51
Voltage - Off State	200 V
Current - On State (It (RMS)) (Max)	4 A
Voltage - Gate Trigger (Vgt) (Max)	2 V
Current - Gate Trigger (Igt) (Max)	5 mA
Current - Hold (Ih) (Max)	10 mA
Triac Type	Logic - Sensitive Gate
Configuration	Single
Operating Temperature	-40°C ~ 110°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-202 Long Tab
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the L2004F51 are qualified based on the following electrical and mechanical parameters:

Triac Type: Logic - Sensitive Gate configuration must be maintained
Current - On State (It (RMS)) (Max): Minimum 4 A required
Configuration: Single configuration only
Mounting Type: Through Hole
RoHS Status: ROHS3 Compliant
Voltage - Off State: Substitute parts rated at 600 V provide enhanced voltage margin over the original 200 V specification, ensuring compatibility in applications where the L2004F51 was used

The two qualified substitutes (BT136-600D,127 and T410-600H) meet or exceed all critical electrical parameters while maintaining the same functional classification and compliance requirements.

Parameter Comparison

Parameter	L2004F51 (Littelfuse)	BT136-600D,127 (WeEn Semiconductors)	T410-600H (STMicroelectronics)
Voltage - Off State	200 V	600 V	600 V
Current - On State (It (RMS)) (Max)	4 A	4 A	4 A
Voltage - Gate Trigger (Vgt) (Max)	2 V	1.5 V	1.3 V
Current - Gate Trigger (Igt) (Max)	5 mA	5 mA	10 mA
Current - Hold (Ih) (Max)	10 mA	10 mA	15 mA
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate
Configuration	Single	Single	Single
Operating Temperature	-40°C ~ 110°C	125°C (TJ)	-40°C ~ 125°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-202 Long Tab	TO-220-3	TO-251-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

Both substitute parts are active products with full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1), providing long-term supply chain stability compared to the obsolete L2004F51.

BT136-600D,127 (WeEn Semiconductors) is packaged in TO-220AB with 18,511 units in stock. This part features a lower gate trigger voltage (1.5 V maximum) and maintains the original gate trigger current specification (5 mA maximum).

T410-600H (STMicroelectronics) is packaged in TO-251 (IPAK) with 16,096 units in stock. This part offers an extended operating temperature range (-40°C ~ 125°C) and higher non-repetitive surge current ratings (30 A / 31 A for 50/60 Hz), with slightly elevated gate trigger current (10 mA maximum) and hold current (15 mA maximum).

Package selection between TO-220AB and TO-251 depends on PCB layout constraints and thermal management requirements of the application.

Frequently Asked Questions (FAQ)

Q: Can the BT136-600D,127 or T410-600H directly replace the L2004F51 in existing designs?

A: Both parts maintain the same Logic - Sensitive Gate TRIAC classification, 4 A on-state current, and single configuration. The higher voltage rating (600 V vs. 200 V) provides additional margin. However, package differences (TO-220AB or TO-251 versus TO-202) require PCB layout modifications.

Q: What is the significance of the higher voltage rating in the substitute parts?

A: The substitute parts are rated for 600 V off-state voltage compared to the original 200 V specification. This higher rating ensures compatibility in applications and provides enhanced voltage margin without affecting on-state current or gate trigger characteristics.

Q: How do the gate trigger parameters differ between the three parts?

A: The L2004F51 has a maximum gate trigger voltage of 2 V. The BT136-600D,127 reduces this to 1.5 V, and the T410-600H further reduces it to 1.3 V. All three maintain a maximum gate trigger current of 5 mA or lower, with the T410-600H specified at 10 mA maximum.

Q: Which substitute part offers the best thermal performance?

A: The T410-600H specifies an operating temperature range of -40°C ~ 125°C, matching the upper limit of the BT136-600D,127 and exceeding the original L2004F51 specification of -40°C ~ 110°C. The T410-600H also provides higher non-repetitive surge current ratings.

Q: Are there any compliance or supply chain advantages to using the substitute parts?

A: Both substitute parts are active products with full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1). The L2004F51 is obsolete, making the active substitutes necessary for new production and long-term availability assurance.

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