C122F1 SCR 50V 8A TO-220AB Equivalent & Substitute Parts

Part Overview

The C122F1 is a Silicon Controlled Rectifier (SCR) rated for 50V off-state voltage and 8A on-state current in a TO-220AB through-hole package. Manufactured by onsemi, this component is classified as obsolete. Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, production planning, and system maintenance where this component is currently deployed.

Key Parameters

Parameter	Value
Voltage - Off State	50 V
Current - On State (It (RMS)) (Max)	8 A
Voltage - Gate Trigger (Vgt) (Max)	1.5 V
Current - Gate Trigger (Igt) (Max)	25 mA
Voltage - On State (Vtm) (Max)	1.83 V
Current - Hold (Ih) (Max)	30 mA
SCR Type	Standard Recovery
Package / Case	TO-220-3
Mounting Type	Through Hole
Operating Temperature	-40°C ~ 125°C

Substitute Part Grouping Explanation

Substitute parts for the C122F1 are identified based on the following critical parameters that determine functional equivalence:

Direct Equivalence Criteria:

SCR Type: Standard Recovery
Package / Case: TO-220-3
Mounting Type: Through Hole
Operating Temperature Range: -40°C ~ 125°C
Current - On State (It (RMS)): 8 A minimum

Voltage Rating Consideration: The C122F1 operates at 50V off-state voltage. Substitute parts may have equal or higher voltage ratings, as higher-rated devices can operate safely in lower-voltage applications. However, lower voltage ratings are not acceptable.

Gate and Hold Current Parameters: Gate trigger voltage, gate trigger current, and hold current must remain within acceptable ranges to ensure reliable triggering and holding characteristics in the target application circuit.

Parameter Comparison

Parameter	C122F1 (Main)	C122F1G (Direct)	TYN608RG (Similar)
Manufacturer	onsemi	onsemi	STMicroelectronics
Product Status	Obsolete	Active	Active
Voltage - Off State	50 V	50 V	600 V
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V	1.3 V
Current - Gate Trigger (Igt) (Max)	25 mA	25 mA	15 mA
Voltage - On State (Vtm) (Max)	1.83 V	1.83 V	1.6 V
Current - On State (It (RMS)) (Max)	8 A	8 A	8 A
Current - Hold (Ih) (Max)	30 mA	30 mA	30 mA
Current - Off State (Max)	10 µA	10 µA	5 µA
SCR Type	Standard Recovery	Standard Recovery	Standard Recovery
Package / Case	TO-220-3	TO-220-3	TO-220-3
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	RoHS non-compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

C122F1G (Direct Substitute): The C122F1G is manufactured by onsemi with identical electrical specifications to the C122F1. It maintains the same 50V voltage rating, 8A current rating, and gate/hold characteristics. The C122F1G is in active production status, ensuring availability and supply chain continuity. This part is the primary choice for direct replacement in applications currently using the C122F1.

TYN608RG (Alternative Substitute): The TYN608RG, manufactured by STMicroelectronics, provides a higher voltage rating of 600V while maintaining the 8A current capacity and Standard Recovery SCR type. This part is suitable for applications where the C122F1 operates below its maximum voltage rating and where higher voltage margin is acceptable. The TYN608RG is ROHS3 compliant, offering environmental compliance advantages. Gate trigger current is lower (15 mA vs. 25 mA), and off-state leakage current is lower (5 µA vs. 10 µA), representing improved performance characteristics. The TYN608RG is in active production status.

Frequently Asked Questions (FAQ)

Q: Can C122F1G be used as a direct replacement for C122F1? A: Yes. The C122F1G shares identical electrical specifications with the C122F1, including voltage rating, current rating, gate characteristics, and operating temperature range. Both are TO-220-3 through-hole packages. The primary difference is product status: C122F1G is active while C122F1 is obsolete.

Q: Is TYN608RG compatible with C122F1 applications? A: TYN608RG is compatible in applications where the C122F1 operates below its 50V maximum rating. The TYN608RG's 600V rating provides higher voltage margin. Both parts maintain 8A current capacity and Standard Recovery SCR type. Gate trigger voltage and hold current are within acceptable ranges. Verify that the application circuit does not depend on the specific gate trigger current value of 25 mA; TYN608RG requires only 15 mA.

Q: What is the difference between C122F1 and C122F1G packaging? A: Both parts use TO-220-3 through-hole packages. C122F1 is supplied in standard packaging, while C122F1G is supplied in bulk packaging. The physical component and electrical performance are identical.

Q: Why does TYN608RG have a higher voltage rating than C122F1? A: TYN608RG is rated for 600V off-state voltage compared to C122F1's 50V rating. Higher voltage-rated SCRs can safely operate in lower-voltage applications. The higher rating provides additional design margin and may offer improved performance in terms of leakage current and gate trigger characteristics.

Q: Are there RoHS compliance considerations for these parts? A: C122F1 is RoHS non-compliant. C122F1G compliance status is not specified in available data. TYN608RG is ROHS3 compliant. For applications requiring RoHS compliance, TYN608RG is the appropriate selection.

Q: What is the inventory status of these substitute parts? A: C122F1G has 6300 pieces in stock. TYN608RG has 1540 pieces in stock. Both are available for immediate procurement.

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