Q4004V3 Equivalent & Substitute Parts

Part Overview

The Q4004V3 is a logic-sensitive gate TRIAC rated for 400 V off-state voltage and 4 A on-state current in a TO-251 through-hole package, manufactured by Littelfuse Inc. This component is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and component procurement.

Key Parameters

Parameter	Value
Triac Type	Logic - Sensitive Gate
Voltage - Off State	400 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)	20 mA
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-251-3

Substitute Part Grouping Explanation

Substitution of the Q4004V3 is determined by the following critical parameters:

Triac Type: Logic-sensitive gate configuration must be maintained
Current Rating: On-state current must meet or exceed 4 A (RMS)
Gate Trigger Characteristics: Vgt and Igt parameters must be compatible with existing gate drive circuitry
Hold Current: Must not exceed circuit requirements
Mounting Type: Through-hole configuration required for PCB compatibility
Operating Temperature Range: Must support -40°C to 125°C junction temperature minimum
RoHS Compliance: Preferred for new designs and long-term availability

The BT134-600E,127 qualifies as a substitute based on matching triac type, current rating, gate trigger parameters, and through-hole mounting, with the trade-off of higher off-state voltage rating (600 V vs. 400 V) and improved RoHS compliance status.

Parameter Comparison

Parameter	Q4004V3 (Main)	BT134-600E,127 (Substitute)
Manufacturer	Littelfuse Inc.	WeEn Semiconductors
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate
Voltage - Off State	400 V	600 V
Current - On State (It (RMS)) (Max)	4 A	4 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.5 V
Current - Gate Trigger (Igt) (Max)	10 mA	10 mA
Current - Hold (Ih) (Max)	20 mA	15 mA
Operating Temperature (TJ)	-40°C ~ 125°C	125°C
Mounting Type	Through Hole	Through Hole
Package / Case	TO-251-3	SOT-82
Product Status	Discontinued at DiGi Electronics	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The BT134-600E,127 is suitable for applications where the Q4004V3 is no longer available. The substitute maintains the same on-state current rating (4 A) and gate trigger current (10 mA), ensuring compatibility with existing gate drive circuits. The higher off-state voltage rating (600 V) provides additional margin in applications operating below 400 V and does not negatively impact circuit performance.

The BT134-600E,127 is ROHS3 compliant and currently in active production with substantial inventory availability (12,526 pcs), supporting long-term supply chain stability. The SOT-82 package is mechanically compatible with TO-251 through-hole mounting, though PCB layout verification is required due to different lead geometry.

The operating temperature specification for the BT134-600E,127 lists 125°C maximum junction temperature without a minimum specification; applications requiring -40°C operation must be evaluated against the substitute's actual low-temperature performance data from the manufacturer's datasheet.

Frequently Asked Questions (FAQ)

Q: Can the BT134-600E,127 directly replace the Q4004V3 without circuit modifications?

A: The BT134-600E,127 maintains the same on-state current (4 A) and gate trigger current (10 mA), allowing direct functional replacement in gate drive circuits. However, PCB layout changes may be necessary due to different package geometries (TO-251 vs. SOT-82). The higher voltage rating (600 V) does not require circuit modifications for applications operating at or below 400 V.

Q: What is the impact of the higher off-state voltage rating on circuit performance?

A: The 600 V rating of the BT134-600E,127 provides additional voltage margin without affecting circuit operation in applications designed for 400 V operation. This higher rating is beneficial for transient protection and does not introduce performance degradation.

Q: Are there package compatibility concerns between TO-251 and SOT-82?

A: Both packages are through-hole configurations with three leads (gate, main terminal 1, main terminal 2). Physical lead spacing and PCB footprint differ; PCB layout must be verified against the substitute's package dimensions before implementation.

Q: How does the gate trigger voltage difference (1.3 V vs. 1.5 V) affect gate drive design?

A: The 0.2 V difference in maximum gate trigger voltage is within typical gate drive circuit tolerances. Existing gate drive circuits designed for the Q4004V3 will function with the BT134-600E,127 without modification.

Q: What is the significance of the RoHS compliance difference?

A: The Q4004V3 is RoHS non-compliant, while the BT134-600E,127 is ROHS3 compliant. For new designs and applications subject to RoHS regulations, the BT134-600E,127 is the appropriate selection. For legacy systems, both components are functionally equivalent.

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