TCR22-4RP Equivalent & Substitute Parts

Part Overview

The TCR22-4RP is a Sensitive Gate SCR (Silicon Controlled Rectifier) rated for 200V off-state voltage with 1.5A RMS current capacity in a TO-92 through-hole package. This part is currently obsolete, making equivalent substitutes necessary for new designs and production continuity. The TCR22-4RP maintains compatibility with legacy applications requiring 200V thyristor functionality with sensitive gate triggering characteristics.

Key Parameters

Parameter	Value
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
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Critical Parameters for Substitution:

SCR Type: Sensitive Gate (gate trigger voltage and current characteristics must match)
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
Operating Temperature: -40°C ~ 110°C
Mounting Type: Through Hole
Package / Case: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Allowable Variation:

Voltage - Off State: May be equal to or greater than 200V (higher voltage rating provides backward compatibility)

The TCR22-6RP and TCR22-8RP are qualified substitutes because they maintain identical gate trigger characteristics, on-state voltage and current parameters, hold current, operating temperature range, and physical package specifications. The increased off-state voltage ratings (400V and 600V respectively) do not compromise functionality in 200V applications.

Parameter Comparison

Parameter	TCR22-4RP (Main)	TCR22-6RP (Substitute)	TCR22-8RP (Substitute)
Voltage - Off State	200 V	400 V	600 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV	800 mV	800 mV
Current - Gate Trigger (Igt) (Max)	200 µA	200 µA	200 µA
Voltage - On State (Vtm) (Max)	1.5 V	1.5 V	1.5 V
Current - On State (It (RMS)) (Max)	1.5 A	1.5 A	1.5 A
Current - Hold (Ih) (Max)	5 mA	5 mA	5 mA
Current - Off State (Max)	1 µA	1 µA	2 µA
SCR Type	Sensitive Gate	Sensitive Gate	Sensitive Gate
Operating Temperature	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

TCR22-6RP (400V Rating): Select this substitute for applications where the TCR22-4RP is obsolete and 400V off-state voltage is acceptable. The TCR22-6RP is active in production with ROHS3 compliance and provides higher voltage margin over the original 200V specification. This part is suitable for direct replacement in legacy designs.

TCR22-8RP (600V Rating): Select this substitute for applications requiring maximum voltage headroom or where 600V off-state rating is specified. The TCR22-8RP is active in production with ROHS3 compliance. Note that REACH status is listed as affected for this part; verify compliance requirements for your application region.

Both substitutes maintain identical gate trigger characteristics and on-state performance parameters, ensuring functional compatibility with the original TCR22-4RP circuit design.

Frequently Asked Questions (FAQ)

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

A: Yes. Both substitutes maintain identical gate trigger voltage (800 mV max), gate trigger current (200 µA max), on-state voltage (1.5 V max), and RMS current rating (1.5 A max). The higher off-state voltage ratings provide backward compatibility with 200V applications.

Q: What is the difference between TCR22-6RP and TCR22-8RP?

A: The primary difference is off-state voltage rating: TCR22-6RP is rated 400V, while TCR22-8RP is rated 600V. All other electrical parameters and gate characteristics are identical. Off-state current is 1 µA for TCR22-6RP and 2 µA for TCR22-8RP.

Q: Are the packages identical?

A: Yes. All three parts use the same TO-226-3, TO-92-3 (TO-226AA) formed leads package with through-hole mounting. PCB layout and component placement are interchangeable.

Q: Which substitute should I select for new designs?

A: For new designs, select based on your circuit's maximum voltage requirement. If 200V is sufficient, TCR22-6RP provides adequate margin. If higher voltage protection is needed, TCR22-8RP is appropriate. Both are active production parts with full compliance certifications.

Q: Are there compliance differences between the substitutes?

A: Both TCR22-6RP and TCR22-8RP are ROHS3 compliant. TCR22-8RP has REACH status listed as affected; verify regional compliance requirements for your application.

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