TCR22-4 Equivalent & Substitute Parts

Part Overview

The TCR22-4 is a Sensitive Gate SCR (Silicon Controlled Rectifier) rated for 200V off-state voltage and 1.5A RMS on-state current in a TO-92 through-hole package, manufactured by Littelfuse Inc. This part is currently obsolete, making equivalent substitutes necessary for new designs and production continuity. Substitute parts must maintain electrical compatibility across gate trigger characteristics, on-state voltage drop, and thermal operating range while accommodating higher voltage ratings where applicable.

Key Parameters

Parameter	TCR22-4
Voltage - Off State	200 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV
Current - Gate Trigger (Igt) (Max)	200 µA
Voltage - On State (Vtm) (Max)	1.5 V
Current - On State (It (RMS)) (Max)	1.5 A
Current - Hold (Ih) (Max)	5 mA
SCR Type	Sensitive Gate
Operating Temperature	-40°C ~ 110°C
Package / Case	TO-92-3 (TO-226AA)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the TCR22-4 is determined by the following electrical and mechanical criteria:

Gate Trigger Compatibility: All substitutes maintain the same Vgt (Max) of 800 mV and Igt (Max) of 200 µA, ensuring gate drive circuits require no modification.

On-State Characteristics: Substitutes maintain equivalent Vtm (Max) and Ih (Max) values, preserving thermal dissipation and circuit behavior during conduction.

Package Compatibility: All substitutes use the TO-92-3 (TO-226AA) through-hole package, maintaining identical PCB footprint and mounting requirements.

SCR Type: All substitutes are Sensitive Gate SCRs, maintaining the same gate sensitivity classification.

Voltage Rating Flexibility: Substitutes are available at 400V and 600V off-state ratings. Higher voltage ratings are backward-compatible with 200V applications and provide design margin for overvoltage conditions.

RoHS Compliance: All substitutes maintain ROHS3 compliance, meeting environmental and regulatory requirements.

Parameter Comparison

Parameter	TCR22-4	TCR22-6	TCR22-8	X0202DA 1BA2	X0202MA 1BA2
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	STMicroelectronics	STMicroelectronics
Voltage - Off State	200 V	400 V	600 V	400 V	600 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV	800 mV	800 mV	800 mV	800 mV
Current - Gate Trigger (Igt) (Max)	200 µA	200 µA	200 µA	200 µA	200 µA
Voltage - On State (Vtm) (Max)	1.5 V	1.5 V	1.5 V	1.45 V	1.45 V
Current - On State (It (RMS)) (Max)	1.5 A	1.5 A	1.5 A	1.25 A	1.25 A
Current - Hold (Ih) (Max)	5 mA	5 mA	5 mA	5 mA	5 mA
SCR Type	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate	Sensitive Gate
Operating Temperature	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Same Voltage Rating): No direct 200V equivalent is available from active product lines. The TCR22-4 is obsolete with no active Littelfuse 200V variant.

For Voltage-Upgraded Substitution: TCR22-6 (400V) and TCR22-8 (600V) from Littelfuse Inc. are active products maintaining identical gate trigger and on-state characteristics. These are suitable for applications where the circuit can tolerate higher voltage ratings without modification.

For Cross-Manufacturer Substitution: X0202DA 1BA2 (STMicroelectronics, 400V) and X0202MA 1BA2 (STMicroelectronics, 600V) are manufacturer-recommended alternatives. These parts offer extended operating temperature range (-40°C to 125°C versus -40°C to 110°C) and improved on-state voltage characteristics (1.45V versus 1.5V maximum). Both maintain gate trigger compatibility and TO-92-3 package compatibility.

Compliance Consideration: All substitute options maintain ROHS3 compliance and are suitable for regulated applications.

Frequently Asked Questions (FAQ)

Q: Can TCR22-6 or TCR22-8 be used as direct replacements for TCR22-4?

A: Yes. Both parts maintain identical gate trigger voltage (800 mV max), gate trigger current (200 µA max), on-state voltage (1.5 V max), and hold current (5 mA max). The higher voltage ratings (400V and 600V) are backward-compatible with 200V applications. No circuit modifications are required.

Q: What is the difference between Littelfuse and STMicroelectronics substitutes?

A: Littelfuse TCR22-6 and TCR22-8 maintain the original specifications exactly. STMicroelectronics X0202DA 1BA2 and X0202MA 1BA2 offer lower on-state voltage (1.45V versus 1.5V) and extended operating temperature range (-40°C to 125°C versus -40°C to 110°C), providing improved thermal performance and wider environmental compatibility.

Q: Are all substitutes in the same package?

A: Yes. All substitute parts use the TO-92-3 (TO-226AA) through-hole package, maintaining identical PCB footprint and mounting requirements.

Q: Why is the TCR22-4 obsolete?

A: The TCR22-4 has been discontinued by Littelfuse Inc. Active product lines focus on higher voltage ratings (400V and 600V) that provide better design margin and are more widely used in modern applications.

Q: Can I use a 600V part in a 200V circuit?

A: Yes. Higher voltage-rated SCRs are fully compatible with lower voltage applications. The 600V rating provides additional overvoltage protection margin without affecting circuit operation at 200V.

Q: What is the difference in current ratings between TCR22-4 and STMicroelectronics substitutes?

A: TCR22-4 and Littelfuse substitutes are rated for 1.5A RMS on-state current. STMicroelectronics X0202DA 1BA2 and X0202MA 1BA2 are rated for 1.25A RMS. For applications requiring the full 1.5A rating, Littelfuse substitutes are recommended.

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