Q6004D4RP TRIAC 600V 4A TO-252 Equivalent & Substitute Parts

Part Overview

The Q6004D4RP is a standard TRIAC thyristor manufactured by Littelfuse Inc., rated for 600V off-state voltage and 4A on-state current in a surface mount TO-252 (DPAK) package. This component is active and in production, with 2600 units currently in stock. Substitute parts are identified when electrical parameters and mechanical compatibility align with the original specification, enabling direct replacement in circuit applications without design modification.

Key Parameters

Parameter	Value
Voltage - Off State	600 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
Operating Temperature Range	-40°C to 125°C (TJ)
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the Q6004D4RP are grouped based on the following criteria:

Primary Compatibility Parameters:

Voltage - Off State: 600 V (exact match required)
Current - On State: 4 A (exact match required)
Package / Case: TO-252-3, DPAK (exact match required)
Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Parameters:

Voltage - Gate Trigger (Vgt Max): 1.3 V or lower
Operating Temperature Range: -40°C to 125°C or equivalent
RoHS Compliance: ROHS3 Compliant or equivalent

Triac Type Variations: Substitutes include Standard TRIACs and Logic - Sensitive Gate variants. Logic - Sensitive Gate types feature lower gate trigger current (Igt) and hold current (Ih), enabling operation with lower-power gate drive circuits while maintaining the same voltage and current ratings.

Parameter Comparison

Part Number	Manufacturer	Triac Type	Voltage (V)	Current (A)	Vgt Max (V)	Igt Max (mA)	Ih Max (mA)	Temp Range (°C)	Package	RoHS
Q6004D4RP	Littelfuse	Standard	600	4	1.3	25	30	-40 to 125	TO-252 DPAK	ROHS3
MAC4DHMT4G	Littelfuse	Logic - Sensitive Gate	600	4	1.3	5	15	-40 to 110	TO-252 DPAK	ROHS3
MAC4DLMT4G	Littelfuse	Logic - Sensitive Gate	600	4	1.3	3	15	-40 to 110	TO-252 DPAK	ROHS3
MAC4DSMT4G	Littelfuse	Logic - Sensitive Gate	600	4	1.3	10	15	-40 to 125	TO-252 DPAK	ROHS3
T405-600B	STMicroelectronics	Logic - Sensitive Gate	600	4	1.3	5	10	-40 to 125	TO-252 DPAK	ROHS3
T405-600B-TR	STMicroelectronics	Logic - Sensitive Gate	600	4	1.3	5	10	-40 to 125	TO-252 DPAK	ROHS3
T405Q-600B-TR	STMicroelectronics	Logic - Sensitive Gate	600	4	1.3	5	10	-40 to 125	TO-252 DPAK	ROHS3
T410-600B	STMicroelectronics	Logic - Sensitive Gate	600	4	1.3	10	15	-40 to 125	TO-252 DPAK	ROHS3
T435-600B	STMicroelectronics	Alternistor - Snubberless	600	4	1.3	35	35	-40 to 125	TO-252 DPAK	ROHS3
T435-600B-TR	STMicroelectronics	Alternistor - Snubberless	600	4	1.3	35	35	-40 to 125	TO-252 DPAK	ROHS3

Engineering Selection Recommendations

All listed substitute parts maintain the core electrical specifications of 600V off-state voltage, 4A on-state current, and 1.3V maximum gate trigger voltage. All parts are ROHS3 compliant and active in production.

Littelfuse MAC4 Series (MAC4DHMT4G, MAC4DLMT4G, MAC4DSMT4G): These Logic - Sensitive Gate variants feature reduced gate trigger current (3–5 mA) and hold current (15 mA), enabling operation with lower-power gate drive circuits. MAC4DSMT4G extends the operating temperature range to 125°C, matching the original Q6004D4RP specification.

STMicroelectronics T405 Series (T405-600B, T405-600B-TR, T405Q-600B-TR): These Logic - Sensitive Gate TRIACs provide 5 mA gate trigger current and 10 mA hold current with full -40°C to 125°C operating range. T405-600B-TR and T405Q-600B-TR are supplied in Cut Tape and Digi-Reel packaging, with T405Q-600B-TR offering higher non-repetitive surge current ratings (35A, 38A).

STMicroelectronics T410-600B: This Logic - Sensitive Gate TRIAC features 10 mA gate trigger current and 15 mA hold current, positioned between standard and highly sensitive gate variants.

STMicroelectronics T435 Series (T435-600B, T435-600B-TR): These Alternistor - Snubberless TRIACs feature higher gate trigger current (35 mA) and hold current (35 mA), suitable for applications requiring snubberless operation without external RC networks.

Frequently Asked Questions (FAQ)

Q: Can MAC4DHMT4G replace Q6004D4RP directly? A: MAC4DHMT4G is electrically compatible for voltage and current ratings but operates at a maximum temperature of 110°C versus 125°C for Q6004D4RP. For applications within -40°C to 110°C, direct substitution is valid. The reduced gate trigger current (5 mA vs. 25 mA) requires lower gate drive power.

Q: What is the difference between Logic - Sensitive Gate and Standard TRIAC types? A: Logic - Sensitive Gate TRIACs require significantly lower gate trigger current (typically 3–10 mA) and hold current (10–15 mA) compared to Standard types (25 mA and 30 mA respectively). This enables direct gate drive from logic-level circuits without additional buffering.

Q: Are T405-600B and T405-600B-TR electrically identical? A: Yes. Both are electrically identical T405 Logic - Sensitive Gate TRIACs. The difference is packaging: T405-600B is supplied in Tube, while T405-600B-TR is supplied in Cut Tape and Digi-Reel format for automated assembly.

Q: Can T435-600B-TR (Alternistor - Snubberless) replace Q6004D4RP? A: T435-600B-TR meets all voltage, current, and package requirements. The Alternistor - Snubberless design eliminates the need for external RC snubber networks in certain applications. Higher gate trigger current (35 mA) requires proportionally higher gate drive power compared to the original 25 mA specification.

Q: What inventory levels are available for each substitute? A: Littelfuse MAC4DHMT4G: 119,400 units; MAC4DLMT4G: 30,900 units; MAC4DSMT4G: 19,900 units. STMicroelectronics T405-600B-TR: 85,400 units; T405Q-600B-TR: 50,300 units; T410-600B: 1,528 units; T435-600B-TR: 31,100 units. Original Q6004D4RP: 2,600 units.

Q: Do all substitutes support the full -40°C to 125°C operating range? A: MAC4DHMT4G and MAC4DLMT4G are rated to 110°C maximum. MAC4DSMT4G, all T405 variants, T410-600B, and T435 variants support the full -40°C to 125°C range.

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