L2004D8RP TRIAC Equivalent & Substitute Parts

Part Overview

The L2004D8RP 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 L2004D8RP serves as a general-purpose thyristor for AC switching applications requiring sensitive gate triggering characteristics. Due to its obsolete status, designers must evaluate active alternative components that maintain functional compatibility within system requirements.

Key Parameters

Parameter	L2004D8RP
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
Current - Non Rep. Surge 50, 60Hz (Itsm)	33A, 40A
Operating Temperature Range	-40°C ~ 110°C (TJ)
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the L2004D8RP is determined by the following critical parameters:

Voltage Rating (Off-State): The substitute must equal or exceed 200V to maintain voltage margin in the application circuit
Current Rating (On-State): The substitute must support minimum 4A RMS current
Gate Trigger Characteristics: Voltage (Vgt) and current (Igt) must be compatible with existing gate drive circuitry
Hold Current (Ih): Must not exceed application requirements
Package and Mounting: TO-252 (DPAK) surface mount configuration is required for PCB compatibility
Temperature Range: Operating temperature capability must meet system thermal requirements
Compliance: RoHS3 compliance is mandatory for current procurement standards

Substitutes are grouped into two categories:

Voltage-Upgraded Substitutes (L4004D8RP, L6004D8RP): Same manufacturer (Littelfuse), identical gate characteristics, higher voltage ratings (400V, 600V). These are direct functional upgrades suitable when circuit voltage margins permit.

Cross-Manufacturer Substitutes (BT136S-600E,118, T405Q-600B-TR): Alternative manufacturers offering 600V rated TRIACs with compatible gate triggering and package form factors. These require parameter verification for gate drive circuit compatibility.

Parameter Comparison

Parameter	L2004D8RP	L4004D8RP	L6004D8RP	BT136S-600E,118	T405Q-600B-TR
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	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)	10 mA	10 mA	10 mA	10 mA	5 mA
Current - Hold (Ih) (Max)	15 mA	15 mA	15 mA	15 mA	10 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	33A, 40A	33A, 40A	33A, 40A	25A, 27A	35A, 38A
Operating Temperature Range	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	125°C (Max)	-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
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

L4004D8RP (Littelfuse, 400V): Recommended as the primary substitute when circuit voltage ratings permit 400V operation. Maintains identical gate trigger characteristics (Vgt 1.3V, Igt 10mA) and hold current specifications. Active product status ensures long-term availability. Identical operating temperature range (-40°C ~ 110°C) and surge current ratings (33A, 40A) provide direct functional equivalence with voltage margin improvement.

L6004D8RP (Littelfuse, 600V): Recommended when maximum voltage margin is required or when circuit topology operates at higher AC line voltages. Maintains all gate and hold current specifications identical to L2004D8RP. Active product status with highest inventory availability (3013 pcs). Extended voltage rating provides design flexibility for future applications.

T405Q-600B-TR (STMicroelectronics, 600V): Suitable substitute offering 600V rating with improved gate trigger current specification (Igt 5mA, lower than L2004D8RP at 10mA). Extended operating temperature range (-40°C ~ 125°C) supports higher thermal environments. Highest inventory availability (50300 pcs) ensures procurement reliability. Gate trigger voltage (Vgt 1.3V) matches original specification.

BT136S-600E,118 (WeEn Semiconductors, 600V): Alternative substitute with 600V rating and compatible gate characteristics. Gate trigger voltage specification (Vgt 1.5V) is 0.2V higher than original; verify gate drive circuit can accommodate this tolerance. Operating temperature maximum (125°C) exceeds original specification. Lower surge current ratings (25A, 27A) require verification against application transient requirements.

Frequently Asked Questions (FAQ)

Q: Can L4004D8RP directly replace L2004D8RP in existing designs?

A: Yes, when circuit voltage ratings permit 400V operation. The L4004D8RP maintains identical gate trigger voltage (1.3V), gate trigger current (10mA), hold current (15mA), and on-state current (4A) specifications. The higher voltage rating (400V vs 200V) provides additional voltage margin without affecting gate drive circuit requirements.

Q: What is the primary difference between L6004D8RP and T405Q-600B-TR?

A: Both are 600V rated TRIACs with 4A on-state current in TO-252 DPAK packages. L6004D8RP (Littelfuse) maintains gate trigger voltage at 1.3V and gate trigger current at 10mA. T405Q-600B-TR (STMicroelectronics) offers lower gate trigger current (5mA) and extended operating temperature range (-40°C ~ 125°C vs -40°C ~ 110°C). Gate drive circuit compatibility must be verified for the lower Igt specification of T405Q-600B-TR.

Q: Is BT136S-600E,118 compatible with existing gate drive circuits designed for L2004D8RP?

A: Compatibility requires verification. The BT136S-600E,118 specifies gate trigger voltage (Vgt) at 1.5V maximum, compared to 1.3V for L2004D8RP. Gate drive circuits must be capable of delivering sufficient voltage to trigger the device reliably. Gate trigger current (Igt) remains at 10mA, matching the original specification.

Q: Why do surge current ratings vary among substitutes?

A: Surge current (Itsm) ratings reflect the device's ability to withstand non-repetitive transient overcurrent conditions. L2004D8RP, L4004D8RP, and L6004D8RP specify 33A/40A (50Hz/60Hz). T405Q-600B-TR specifies 35A/38A. BT136S-600E,118 specifies 25A/27A. Applications with high inrush current or transient overvoltage conditions must verify that selected substitute meets surge withstand requirements.

Q: Are all substitutes RoHS3 compliant?

A: Yes. L2004D8RP, L4004D8RP, L6004D8RP, BT136S-600E,118, and T405Q-600B-TR are all ROHS3 compliant, meeting current environmental and procurement standards.

Q: What is the impact of operating temperature range differences?

A: L2004D8RP, L4004D8RP, and L6004D8RP specify -40°C ~ 110°C operating range. T405Q-600B-TR extends to -40°C ~ 125°C, and BT136S-600E,118 specifies 125°C maximum. Applications operating in elevated thermal environments may benefit from substitutes with extended temperature ratings. Verify that thermal design margins remain adequate for the selected component.

Q: Can substitutes be used interchangeably in production?

A: No. Each substitute must be qualified individually through circuit simulation and prototype testing to verify gate drive circuit compatibility, thermal performance, and transient response. Differences in gate trigger voltage, gate trigger current, and surge current ratings require application-specific validation before production implementation.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message