QJ8025LH5TP Equivalent & Substitute Parts

Part Overview

The QJ8025LH5TP is an 800 V, 25 A Alternistor-type TRIAC manufactured by Littelfuse Inc. in an isolated tab TO-220AB package. This snubberless thyristor is designed for AC switching applications requiring high voltage isolation and controlled gate triggering. The part is active and in production with 838 units currently in stock.

Substitute parts are identified when equivalent electrical performance can be maintained across critical parameters including off-state voltage, on-state current rating, gate trigger characteristics, and thermal operating range, while maintaining compatible packaging and mounting configurations.

Key Parameters

Parameter	Value	Unit
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)	50	mA
Current - Hold (Ih) (Max)	50	mA
Operating Temperature Range	-40 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3 Isolated Tab	—
Configuration	Single	—

Substitute Part Grouping Explanation

Substitution eligibility for the QJ8025LH5TP is determined by the following critical parameters:

Off-State Voltage: Must equal 800 V
On-State Current Rating: Must equal or exceed 25 A (RMS)
Gate Trigger Voltage (Vgt): Must equal 1.3 V maximum
Package Configuration: Must be TO-220AB or TO-220-3 with isolated tab
Mounting Type: Must be Through Hole
Single Configuration: Must maintain single TRIAC configuration

The QJ8025LH5TP is an Alternistor-type (snubberless) TRIAC. Substitute parts identified include both Alternistor and Standard TRIAC types, as both configurations operate within the specified electrical parameters and are compatible with the application requirements defined by voltage, current, and gate trigger specifications.

Parameter Comparison

Parameter	QJ8025LH5TP (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)	50 mA	35 mA	35 mA
Current - Hold (Ih) (Max)	50 mA	50 mA	50 mA
Current - Non Rep. Surge 50Hz	208 A	250 A	270 A
Current - Non Rep. Surge 60Hz	250 A	275 A	297 A
Operating Temperature (TJ)	-40 to 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 provides direct electrical equivalence to the QJ8025LH5TP with matched on-state current rating (25 A) and gate trigger voltage (1.3 V). Both parts maintain 800 V off-state voltage and TO-220-3 isolated tab packaging. The BTA425Y-800CTQ is ROHS3 compliant and active in production with 10,145 units in stock. This part is suitable for direct substitution in applications where the Littelfuse part is unavailable.

BTA330Y-800CTQ offers higher on-state current capability (30 A) while maintaining the same 800 V off-state voltage and 1.3 V gate trigger voltage. The package is TO-220-3 without isolated tab specification. This part is ROHS3 compliant and active in production with 6,016 units in stock. Selection of this part is appropriate for applications where increased current margin is beneficial, provided the package configuration (non-isolated tab) is compatible with the circuit design.

Both substitute parts are manufactured by WeEn Semiconductors and meet the same compliance standards as the main part. Product status is active for all three parts, ensuring continued availability.

Frequently Asked Questions (FAQ)

Q: Can BTA425Y-800CTQ directly replace QJ8025LH5TP?

A: Yes. Both parts share identical off-state voltage (800 V), on-state current rating (25 A), and gate trigger voltage (1.3 V). Package configuration is TO-220-3 with isolated tab for both parts. Electrical performance and thermal characteristics are equivalent.

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

A: The primary difference is on-state current rating: BTA425Y-800CTQ is rated for 25 A, while BTA330Y-800CTQ is rated for 30 A. Both maintain 800 V off-state voltage and 1.3 V gate trigger voltage. The BTA330Y-800CTQ package is specified as TO-220-3 without isolated tab notation, while BTA425Y-800CTQ includes isolated tab specification.

Q: Are there temperature operating range differences?

A: The QJ8025LH5TP specifies -40°C to 150°C operating range. The substitute parts specify 150°C maximum junction temperature. Verify minimum operating temperature requirements for your application if operation below 0°C is required.

Q: What does "isolated tab" mean in the package specification?

A: Isolated tab indicates the mounting tab is electrically isolated from the device terminals, allowing direct mounting to a heat sink without electrical isolation hardware. Non-isolated tab designs require insulating washers or pads between the device and heat sink to prevent electrical connection.

Q: Are all three parts RoHS compliant?

A: Yes. QJ8025LH5TP, BTA425Y-800CTQ, and BTA330Y-800CTQ are all ROHS3 compliant.

Q: Which substitute part should I select if current capacity is not a limiting factor?

A: BTA425Y-800CTQ is the preferred substitute, as it provides exact electrical equivalence to the QJ8025LH5TP with matched current rating and isolated tab packaging configuration.

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