S8012R SCR 800V 12A TO-220 Equivalent & Substitute Parts

Part Overview

The S8012R is a silicon-controlled rectifier (SCR) manufactured by Littelfuse Inc., rated for 800V off-state voltage and 12A RMS on-state current in a TO-220-3 through-hole package. This component is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design requirements and production continuity. The part operates across the industrial temperature range of -40°C to 125°C and is ROHS3 compliant.

Key Parameters

Parameter	S8012R Value
Voltage - Off State	800 V
Current - On State (It (RMS))	12 A
Voltage - On State (Vtm) (Max)	1.6 V
SCR Type	Standard Recovery
Package / Case	TO-220-3
Mounting Type	Through Hole
Operating Temperature	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the S8012R is determined by the following critical parameters:

Voltage Rating (Off State): Must equal 800V to maintain circuit protection and voltage handling capability
Current Rating (RMS): Must equal or exceed 12A to support the same load conditions
On-State Voltage (Vtm): Must not exceed 1.6V to maintain thermal and efficiency characteristics
SCR Type: Must be Standard Recovery to ensure compatible switching behavior
Package / Case: Must be TO-220-3 for mechanical and thermal interface compatibility
Operating Temperature Range: Must support -40°C to 125°C for environmental compatibility
RoHS Compliance: Must maintain ROHS3 compliance for regulatory alignment

The substitute parts TYN812RG and TYN816RG from STMicroelectronics meet these criteria. Both are active products with improved current specifications and enhanced surge ratings compared to the discontinued S8012R.

Parameter Comparison

Parameter	S8012R (Littelfuse)	TYN812RG (STMicroelectronics)	TYN816RG (STMicroelectronics)
Voltage - Off State	800 V	800 V	800 V
Current - On State (It (RMS)) (Max)	12 A	12 A	16 A
Voltage - On State (Vtm) (Max)	1.6 V	1.6 V	1.6 V
Current - Gate Trigger (Igt) (Max)	20 mA	15 mA	25 mA
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.3 V	1.5 V
Current - Hold (Ih) (Max)	40 mA	30 mA	40 mA
Current - Off State (Max)	20 µA	5 µA	5 µA
Current - Non Rep. Surge 50, 60Hz (Itsm)	100A, 120A	140A, 145A	160A, 167A
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	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics	Active	Active

Engineering Selection Recommendations

TYN812RG is the direct functional equivalent to the S8012R. It maintains identical voltage and current ratings while offering improved performance characteristics: lower gate trigger current (15 mA vs. 20 mA), reduced off-state leakage current (5 µA vs. 20 µA), and higher non-repetitive surge ratings (140A/145A vs. 100A/120A). The part is ROHS3 compliant and currently in active production with 26,200 units in stock.

TYN816RG is a higher-current variant rated for 16A RMS, providing additional current margin for applications requiring headroom beyond the 12A specification. This part shares identical voltage ratings and on-state voltage characteristics with the S8012R while offering enhanced surge capability (160A/167A). It is also ROHS3 compliant and active in production with 1,925 units available.

Both substitute parts are manufactured by STMicroelectronics, a qualified semiconductor supplier, and maintain full compliance with applicable regulatory standards.

Frequently Asked Questions (FAQ)

Q: Can TYN812RG be used as a direct replacement for S8012R? A: Yes. The TYN812RG maintains identical voltage (800V) and current (12A RMS) ratings, matching on-state voltage (1.6V max), and identical package (TO-220-3). Both are Standard Recovery SCRs with the same operating temperature range and RoHS compliance.

Q: What is the difference between TYN812RG and TYN816RG? A: The primary difference is the on-state current rating: TYN812RG is rated for 12A RMS, while TYN816RG is rated for 16A RMS. Both share the same 800V voltage rating and 1.6V on-state voltage. TYN816RG provides additional current capacity and higher surge ratings (160A/167A vs. 140A/145A).

Q: Are the substitute parts pin-compatible with S8012R? A: Yes. Both TYN812RG and TYN816RG use the TO-220-3 package with identical pinout and mechanical interface to the S8012R.

Q: Do the substitute parts meet the same compliance requirements? A: Yes. Both TYN812RG and TYN816RG are ROHS3 compliant and carry EAR99 ECCN classification, matching the S8012R compliance profile.

Q: Which substitute should be selected for new designs? A: Selection depends on application current requirements. For applications requiring exactly 12A RMS, TYN812RG is appropriate. For applications with higher current demands or requiring design margin, TYN816RG is suitable. Both are active products with established supply availability.

Q: Are there thermal or mounting differences between these parts? A: No. All three parts use identical TO-220-3 through-hole packaging with the same thermal interface and mounting requirements.

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