QJ8025LH4TP Equivalent & Substitute Parts

Part Overview

The QJ8025LH4TP is an Alternistor-type TRIAC manufactured by Littelfuse Inc., rated for 800 V off-state voltage and 25 A on-state current in a Through Hole ITO-220AB package. This snubberless design is actively produced and ROHS3 compliant. Substitute parts may be required due to inventory constraints, supply chain discontinuities, or application-specific performance requirements within compatible electrical and mechanical parameters.

Key Parameters

Parameter	Value
Voltage - Off State	800 V
Current - On State (It (RMS)) (Max)	25 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V
Current - Gate Trigger (Igt) (Max)	35 mA
Current - Hold (Ih) (Max)	50 mA
Operating Temperature Range	-40°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-220-3 Isolated Tab
Configuration	Single

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment of the following critical parameters:

Voltage - Off State: 800 V (exact match required)
Current - On State (It (RMS)) (Max): 25 A or higher
Voltage - Gate Trigger (Vgt) (Max): 1.3 V (exact match required)
Current - Gate Trigger (Igt) (Max): 35 mA (exact match required)
Current - Hold (Ih) (Max): 50 mA (exact match required)
Mounting Type: Through Hole
Package / Case: TO-220-3 configuration with isolated tab
Configuration: Single

The QJ8025LH4TP qualifies two substitute parts: BTA425Y-800CTQ (exact current rating match) and BTA330Y-800CTQ (higher current rating). Both maintain identical gate trigger specifications and thermal operating range compatibility.

Parameter Comparison

Parameter	QJ8025LH4TP (Main)	BTA425Y-800CTQ	BTA330Y-800CTQ
Manufacturer	Littelfuse Inc.	WeEn Semiconductors	WeEn Semiconductors
Voltage - Off State	800 V	800 V	800 V
Current - On State (It (RMS)) (Max)	25 A	25 A	30 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.3 V	1.3 V
Current - Gate Trigger (Igt) (Max)	35 mA	35 mA	35 mA
Current - Hold (Ih) (Max)	50 mA	50 mA	50 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	208A, 250A	250A, 275A	270A, 297A
Operating Temperature (TJ)	-40°C ~ 150°C	150°C	150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3 Isolated Tab	TO-220-3 Isolated Tab	TO-220-3
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

BTA425Y-800CTQ is the primary substitute for QJ8025LH4TP. Both parts maintain identical on-state current ratings (25 A), gate trigger specifications, and hold current parameters. The BTA425Y-800CTQ features higher non-repetitive surge current capability (250A, 275A vs. 208A, 250A) and includes isolated tab packaging. Both are ROHS3 compliant and actively produced.

BTA330Y-800CTQ serves as a secondary substitute where higher current capacity (30 A) is acceptable within circuit design margins. This part provides increased surge current handling (270A, 297A) and maintains all critical gate trigger and hold current specifications. The BTA330Y-800CTQ is ROHS3 compliant and actively produced with higher inventory availability (6016 pcs vs. 1662 pcs for the main part).

All three parts are classified as active products with unlimited moisture sensitivity levels (MSL 1) and identical ECCN/HTSUS coding, confirming regulatory and compliance equivalence.

Frequently Asked Questions (FAQ)

Q: Can BTA425Y-800CTQ directly replace QJ8025LH4TP in existing designs?

A: Yes. Both parts share identical voltage ratings (800 V), on-state current (25 A), gate trigger voltage (1.3 V), gate trigger current (35 mA), and hold current (50 mA). Pin configuration and TO-220-3 isolated tab packaging are compatible. The BTA425Y-800CTQ provides higher surge current capability without affecting circuit operation.

Q: What is the difference between the Littelfuse QJ8025LH4TP and WeEn Semiconductors BTA425Y-800CTQ?

A: The primary difference is manufacturer and TRIAC type classification. QJ8025LH4TP is an Alternistor-type (snubberless) design; BTA425Y-800CTQ is a Standard TRIAC. Both maintain identical electrical specifications for voltage, current, and gate trigger parameters. The BTA425Y-800CTQ offers higher non-repetitive surge current ratings.

Q: When should BTA330Y-800CTQ be selected instead of BTA425Y-800CTQ?

A: BTA330Y-800CTQ is suitable when circuit design permits higher on-state current capacity (30 A vs. 25 A). This part provides enhanced surge current handling and is available in higher inventory quantities. Selection depends on application current requirements and thermal design margins.

Q: Are all three parts ROHS3 compliant?

A: Yes. QJ8025LH4TP, BTA425Y-800CTQ, and BTA330Y-800CTQ are all ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity levels.

Q: What is the package difference between BTA425Y-800CTQ and BTA330Y-800CTQ?

A: BTA425Y-800CTQ is specified as TO-220-3 with isolated tab. BTA330Y-800CTQ is specified as TO-220-3 without explicit isolated tab notation. Both are Through Hole mounted in TO-220-3 configuration and are mechanically compatible with QJ8025LH4TP footprints.

Q: Can these parts be used interchangeably in AC switching applications?

A: Yes, within the specified electrical parameters. All three parts are rated for 800 V off-state voltage and maintain identical gate trigger specifications (1.3 V maximum, 35 mA maximum). Circuit design must account for the on-state current rating of the selected part (25 A for QJ8025LH4TP and BTA425Y-800CTQ; 30 A for BTA330Y-800CTQ).

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