L2004D6RP Equivalent & Substitute Parts

Part Overview

The L2004D6RP is a Logic-Sensitive Gate TRIAC manufactured by Littelfuse Inc., rated for 200V off-state voltage and 4A on-state current in a Surface Mount TO-252 (DPAK) package. This component is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part operates across a temperature range of -40°C to 110°C and complies with ROHS3 standards with MSL Level 1 moisture sensitivity.

Key Parameters

Parameter	L2004D6RP
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)	5 mA
Current - Hold (Ih) (Max)	10 mA
Operating Temperature	-40°C ~ 110°C (TJ)
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the L2004D6RP is determined by the following critical parameters:

Package Compatibility: All substitute parts must use TO-252-3 DPAK (2 Leads + Tab) surface mount package
Current Rating: On-state current must be 4A (RMS) maximum
Gate Trigger Characteristics: Voltage-gate trigger (Vgt) and current-gate trigger (Igt) must remain within specified limits
Hold Current: Maximum hold current (Ih) of 10 mA
Configuration: Single TRIAC configuration only
Compliance: ROHS3 compliance and MSL Level 1 required

Substitute parts are grouped into two categories:

Category 1 - Littelfuse Upgrades: Higher voltage-rated alternatives (L4004D6RP at 400V, L6004D6RP at 600V) that maintain identical gate trigger and hold current specifications while providing enhanced voltage capability.

Category 2 - Cross-Manufacturer Alternatives: Parts from WeEn Semiconductors (BT136S-600D,118) and STMicroelectronics (T405Q-600B-TR) that match the 600V voltage rating and 4A current rating with compatible gate characteristics.

Parameter Comparison

Parameter	L2004D6RP	L4004D6RP	L6004D6RP	BT136S-600D,118	T405Q-600B-TR
Manufacturer	Littelfuse Inc.	Littelfuse	Littelfuse Inc.	WeEn Semiconductors	STMicroelectronics
Voltage - Off State	200 V	400 V	600 V	600 V	600 V
Current - On State (It (RMS)) (Max)	4 A	4 A	4 A	4 A	4 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.3 V	1.3 V	1.5 V	1.3 V
Current - Gate Trigger (Igt) (Max)	5 mA	5 mA	5 mA	5 mA	5 mA
Current - Hold (Ih) (Max)	10 mA	10 mA	10 mA	10 mA	10 mA
Operating Temperature	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	125°C (TJ)	-40°C ~ 125°C
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

L4004D6RP (Littelfuse, 400V): This part is the direct Littelfuse upgrade path, maintaining identical gate trigger voltage (1.3V) and hold current specifications while doubling the off-state voltage rating to 400V. Product status is Active with full availability. Selection is appropriate for applications requiring higher voltage margin while preserving original gate drive characteristics.

L6004D6RP (Littelfuse, 600V): This part provides maximum voltage capability within the Littelfuse product line at 600V off-state rating. Gate trigger and hold current parameters remain identical to the original part. Product status is Active with highest inventory availability (5386 pcs). Selection is appropriate for applications requiring maximum voltage headroom.

T405Q-600B-TR (STMicroelectronics, 600V): This part matches the 600V voltage rating and maintains the 1.3V gate trigger voltage specification. Operating temperature range extends to 125°C maximum junction temperature. Product status is Active with extensive inventory (50300 pcs). REACH status is Unaffected. Selection is appropriate for high-volume applications with extended temperature requirements.

BT136S-600D,118 (WeEn Semiconductors, 600V): This part provides 600V off-state voltage with 4A current rating. Gate trigger voltage is specified at 1.5V maximum, representing a 0.2V increase from the original specification. Operating temperature maximum is 125°C. Product status is Active. REACH status is Affected. Selection requires gate drive circuit evaluation due to the higher gate trigger voltage specification.

Frequently Asked Questions (FAQ)

Q: Can L4004D6RP or L6004D6RP be used as direct replacements for L2004D6RP?

A: Yes. Both Littelfuse upgrades maintain identical gate trigger voltage (1.3V), gate trigger current (5mA), and hold current (10mA) specifications. The higher voltage ratings (400V and 600V respectively) provide enhanced voltage capability without affecting gate drive circuit requirements. Package and mounting type are identical.

Q: What is the key difference between T405Q-600B-TR and BT136S-600D,118?

A: Both parts are rated for 600V off-state voltage and 4A on-state current. The primary difference is gate trigger voltage: T405Q-600B-TR specifies 1.3V (matching the original L2004D6RP), while BT136S-600D,118 specifies 1.5V maximum. This 0.2V difference may affect gate drive circuit performance and requires evaluation. T405Q-600B-TR also offers a wider operating temperature range (-40°C to 125°C) compared to BT136S-600D,118 (125°C maximum).

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts use TO-252-3 DPAK (2 Leads + Tab) surface mount package with SC-63 designation. PCB footprint and thermal characteristics are compatible across all listed alternatives.

Q: Which substitute part has the best availability?

A: T405Q-600B-TR from STMicroelectronics has the highest inventory level at 50300 pcs. L6004D6RP from Littelfuse is the second option with 5386 pcs available.

Q: Does the higher operating temperature of substitute parts affect circuit design?

A: T405Q-600B-TR and BT136S-600D,118 both specify maximum junction temperature of 125°C, compared to 110°C for the original L2004D6RP. This provides additional thermal margin in applications operating near temperature limits. No circuit redesign is required; the higher rating is a benefit.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL Level 1 moisture sensitivity rating, matching the original part's compliance status.

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