Q2004D4RP TRIAC Equivalent & Substitute Parts

Part Overview

The Q2004D4RP is a standard 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. Substitute TRIACs in this category maintain compatible mechanical packaging and gate trigger characteristics while offering enhanced voltage ratings or current capabilities.

Key Parameters

Parameter	Q2004D4RP
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)	25 mA
Current - Hold (Ih) (Max)	30 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	46A, 55A
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the Q2004D4RP is determined by the following criteria:

Mechanical Compatibility: All substitute parts must use the TO-252-3 DPAK package to ensure PCB footprint compatibility without redesign.

Gate Trigger Parameters: Voltage gate trigger (Vgt) and current gate trigger (Igt) must remain within acceptable ranges to ensure reliable gate control with existing driver circuits. The Q2004D4RP specifies Vgt (Max) of 1.3V and Igt (Max) of 25mA.

Operating Temperature Range: Substitute parts must support the -40°C to 125°C junction temperature range or higher to maintain thermal performance in the target application.

Voltage and Current Ratings: Substitute parts may exceed the original 200V and 4A ratings, providing design margin and component availability. Higher voltage ratings are backward compatible in applications requiring lower voltages.

Compliance Standards: All substitute parts must maintain ROHS3 compliance and equivalent moisture sensitivity levels (MSL 1 - Unlimited).

Parameter Comparison

Parameter	Q2004D4RP	Q4004D4RP	Q6004D4RP	BT137S-600F,118
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	WeEn Semiconductors
Voltage - Off State	200 V	400 V	600 V	600 V
Current - On State (It (RMS)) (Max)	4 A	4 A	4 A	8 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.3 V	1.3 V	1.5 V
Current - Gate Trigger (Igt) (Max)	25 mA	25 mA	25 mA	25 mA
Current - Hold (Ih) (Max)	30 mA	30 mA	30 mA	20 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	46A, 55A	46A, 55A	46A, 55A	65A, 71A
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	125°C (TJ)
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

Q4004D4RP (Littelfuse Inc.): This part is an active product with identical current and gate trigger specifications to the Q2004D4RP, with doubled off-state voltage (400V). It maintains ROHS3 compliance and the same operating temperature range. Selection is appropriate for applications requiring higher voltage margin while preserving gate drive compatibility.

Q6004D4RP (Littelfuse Inc.): This part is an active product with tripled off-state voltage (600V) compared to the Q2004D4RP, while maintaining 4A current rating and identical gate trigger parameters. It provides maximum voltage headroom and ROHS3 compliance. Selection is appropriate for applications operating at higher supply voltages or requiring enhanced transient protection.

BT137S-600F,118 (WeEn Semiconductors): This part is an active product with 600V off-state voltage and doubled on-state current (8A). Gate trigger voltage is slightly elevated (1.5V maximum versus 1.3V), and hold current is reduced (20mA versus 30mA). This part offers enhanced current capacity and is RoHS compliant. Selection requires verification that the gate drive circuit can accommodate the higher Vgt specification and that the reduced Ih does not affect circuit stability.

Frequently Asked Questions (FAQ)

Q: Can Q4004D4RP or Q6004D4RP be used as direct replacements for Q2004D4RP?

A: Yes. Both parts maintain identical on-state current (4A), gate trigger voltage (1.3V maximum), and gate trigger current (25mA maximum) specifications. The TO-252 DPAK package is identical. Higher voltage ratings are backward compatible in applications designed for lower voltages.

Q: What is the difference between the Littelfuse Q-series substitutes and the WeEn BT137S-600F,118?

A: The BT137S-600F,118 offers doubled on-state current (8A versus 4A) and higher non-repetitive surge current (65A/71A versus 46A/55A). Gate trigger voltage is 1.5V maximum (versus 1.3V), and hold current is 20mA (versus 30mA). These differences require circuit validation before selection.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the TO-252-3 DPAK (2 Leads + Tab) package, ensuring PCB footprint compatibility without layout modifications.

Q: What compliance certifications apply to these parts?

A: Q2004D4RP, Q4004D4RP, and Q6004D4RP are ROHS3 compliant with MSL 1 (Unlimited). BT137S-600F,118 is RoHS compliant with MSL 1 (Unlimited). All parts carry EAR99 ECCN classification.

Q: Why is the Q2004D4RP classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured. Active substitute parts with enhanced specifications (Q4004D4RP, Q6004D4RP, BT137S-600F,118) are available for new designs and ongoing production support.

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