T2322B TRIAC Equivalent & Substitute Parts

Part Overview

The T2322B is a Logic - Sensitive Gate TRIAC rated for 200 V off-state voltage and 2.5 A on-state current, manufactured by onsemi in TO-126 through-hole packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The T2322B serves applications requiring low-voltage AC switching with sensitive gate triggering characteristics. Substitution requires matching the core electrical parameters: 200 V voltage rating, 2.5 A current capacity, sensitive gate configuration, and through-hole mounting compatibility.

Key Parameters

Parameter	Value	Unit
Triac Type	Logic - Sensitive Gate	—
Voltage - Off State	200	V
Current - On State (It (RMS)) (Max)	2.5	A
Voltage - Gate Trigger (Vgt) (Max)	2.2	V
Current - Gate Trigger (Igt) (Max)	10	mA
Current - Hold (Ih) (Max)	30	mA
Operating Temperature Range	-40 to 110	°C
Mounting Type	Through Hole	—
Package / Case	TO-225AA, TO-126-3	—

Substitute Part Grouping Explanation

Substitution for the T2322B is categorized into two groups based on electrical parameter alignment:

Direct Equivalent (T2322BG): Maintains identical electrical specifications across all critical parameters—200 V off-state voltage, 2.5 A on-state current, 2.2 V gate trigger voltage, and 10 mA gate trigger current. The primary difference is packaging format (TO-225AA versus TO-126-3) and product status (active versus obsolete). This part is manufactured by Littelfuse Inc. and is RoHS3 compliant.

Similar Substitute (BT134-600D,127): Provides higher voltage and current ratings (600 V, 4 A) with improved gate sensitivity (1.5 V gate trigger voltage, 5 mA gate trigger current). This part is manufactured by WeEn Semiconductors and is suitable only when the application can tolerate elevated voltage and current specifications. The package format differs (SOT-82-3 versus TO-126-3).

Parameter Comparison

Parameter	T2322B (Main)	T2322BG (Direct)	BT134-600D,127 (Similar)
Manufacturer	onsemi	Littelfuse Inc.	WeEn Semiconductors
Product Status	Obsolete	Active	Active
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate
Voltage - Off State (V)	200	200	600
Current - On State (It (RMS)) (Max) (A)	2.5	2.5	4
Voltage - Gate Trigger (Vgt) (Max) (V)	2.2	2.2	1.5
Current - Gate Trigger (Igt) (Max) (mA)	10	10	5
Current - Hold (Ih) (Max) (mA)	30	30	10
Operating Temperature Range (°C)	-40 to 110	-40 to 110	Up to 125
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-225AA, TO-126-3	TO-225AA	SOT-82
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	Not specified

Engineering Selection Recommendations

For Direct Replacement: T2322BG is the primary substitute when an active-status component is required. It maintains all electrical specifications of the T2322B while offering RoHS3 compliance. The TO-225AA package is mechanically compatible with TO-126-3 footprints in most through-hole applications, though PCB layout verification is necessary.

For Upgraded Performance: BT134-600D,127 is suitable when the application environment permits higher voltage and current ratings. The 600 V off-state voltage and 4 A on-state current provide design margin for circuits operating below these thresholds. The improved gate sensitivity (1.5 V trigger voltage, 5 mA trigger current) reduces gate drive requirements. However, the SOT-82-3 package requires PCB footprint modification and mechanical re-qualification.

Compliance Considerations: Both substitute parts are RoHS3 compliant, addressing regulatory requirements that the obsolete T2322B does not meet. Selection should account for supply chain availability, cost, and thermal management requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can T2322BG replace T2322B directly on the PCB? A: T2322BG maintains identical electrical specifications. The TO-225AA package is mechanically compatible with TO-126-3 through-hole footprints. Physical pin spacing and lead diameter should be verified against the PCB design before assembly.

Q: What are the key differences between T2322BG and BT134-600D,127? A: T2322BG is a direct electrical equivalent with identical voltage and current ratings. BT134-600D,127 provides higher voltage (600 V vs. 200 V) and current (4 A vs. 2.5 A) ratings with improved gate sensitivity. BT134-600D,127 uses SOT-82-3 packaging, requiring PCB redesign.

Q: Is BT134-600D,127 suitable for applications designed for T2322B? A: BT134-600D,127 is suitable only if the application circuit can tolerate higher voltage and current specifications. The elevated ratings do not degrade performance in lower-voltage applications but require verification of gate drive compatibility and thermal dissipation.

Q: What packaging considerations apply to these substitutes? A: T2322B and T2322BG use through-hole TO-series packages (TO-126-3 and TO-225AA respectively) with compatible lead spacing. BT134-600D,127 uses SOT-82-3 packaging with different pin configuration, requiring PCB footprint modification.

Q: Are there RoHS compliance differences? A: T2322B is RoHS non-compliant. Both T2322BG and BT134-600D,127 are RoHS3 compliant, meeting current environmental and regulatory standards.

Q: What is the inventory status of these parts? A: T2322B has 1,141 pieces in stock (obsolete status). T2322BG has 5,700 pieces available. BT134-600D,127 has 1,000,200 pieces in stock, indicating strong supply availability.

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