S6012R SCR 600V 12A TO220 Equivalent & Substitute Parts

Part Overview

The S6012R is a Silicon Controlled Rectifier (SCR) manufactured by Littelfuse Inc., rated for 600V 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 support and procurement. The S6012R operates across a temperature range of -40°C to 125°C and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Key Parameters

Parameter	S6012R Value	Unit
Voltage - Off State	600	V
Voltage - Gate Trigger (Vgt) Max	1.5	V
Current - Gate Trigger (Igt) Max	20	mA
Voltage - On State (Vtm) Max	1.6	V
Current - On State (It RMS) Max	12	A
Current - Hold (Ih) Max	40	mA
Current - Off State Max	10	µA
Operating Temperature Range	-40 to 125	°C
Package / Case	TO-220-3	—
SCR Type	Standard Recovery	—

Substitute Part Grouping Explanation

Substitution eligibility for the S6012R is determined by the following critical parameters:

Off-state voltage rating: 600V or higher
RMS on-state current rating: 12A or higher
Package type: TO-220-3 through-hole configuration
SCR type: Standard Recovery
Gate trigger voltage (Vgt): 1.5V or lower
Gate trigger current (Igt): 20mA or lower
On-state voltage (Vtm): 1.6V or lower
Operating temperature range: Minimum -40°C to 125°C

All substitute parts listed meet or exceed these parameters, ensuring functional compatibility in applications designed for the S6012R.

Parameter Comparison

Parameter	S6012R (Littelfuse)	SCT151B-650R (SMC)	SCT612B (SMC)	TYN612RG (STMicro)	TYN616RG (STMicro)	TYN625RG (STMicro)
Voltage - Off State (V)	600	650	600	600	600	600
Voltage - Gate Trigger Max (V)	1.5	1.5	1.5	1.3	1.5	1.3
Current - Gate Trigger Max (mA)	20	15	15	15	25	40
Voltage - On State Max (V)	1.6	1.6	1.55	1.6	1.6	1.6
Current - On State RMS Max (A)	12	12	12	12	16	25
Current - Hold Max (mA)	40	30	50	30	40	50
Current - Off State Max (µA)	10	10	5	5	5	5
Operating Temperature Range (°C)	-40 to 125	-40 to 125	-40 to 150	-40 to 125	-40 to 125	-40 to 125
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Discontinued	Obsolete	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended for 1:1 Replacement)

TYN612RG (STMicroelectronics) is the primary direct equivalent. It maintains 600V off-state voltage and 12A RMS current rating with active product status, ensuring long-term availability. Gate trigger parameters (Vgt 1.3V, Igt 15mA) are superior to the S6012R specification, providing improved triggering reliability.

SCT612B (SMC Diode Solutions) provides electrical equivalence at 600V and 12A with identical on-state voltage (1.55V). However, product status is obsolete, limiting future procurement viability.

Higher Current Alternatives (For Upgraded Designs)

TYN616RG (STMicroelectronics) and TYN625RG (STMicroelectronics) offer increased current ratings (16A and 25A respectively) while maintaining 600V voltage rating and active product status. These are suitable for applications requiring higher current capacity without redesign of thermal management or gate drive circuits.

Higher Voltage Alternative

SCT151B-650R (SMC Diode Solutions) provides 650V off-state voltage with 12A RMS current, offering enhanced voltage margin. Product status is obsolete.

All substitute parts are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity), matching the original part's environmental compliance profile.

Frequently Asked Questions (FAQ)

Q: Can TYN616RG or TYN625RG be used as direct replacements for S6012R?

A: Yes. Both parts exceed the S6012R current rating (16A and 25A versus 12A) while maintaining the same 600V voltage rating and TO-220-3 package. The higher current rating does not prevent operation in circuits designed for 12A; the device will simply have additional current capacity margin. Gate drive circuits require no modification.

Q: What is the difference between TO-220, TO-220B, and TO-220C package variants?

A: All three variants are mechanically compatible in TO-220-3 footprints and share identical electrical pin configurations. Differences are minor mechanical variations in tab isolation and mounting characteristics. Substitution between these variants is electrically valid.

Q: Why is TYN612RG preferred over SCT612B despite both being 600V 12A devices?

A: TYN612RG has active product status, ensuring ongoing availability and manufacturing support. SCT612B is obsolete, presenting long-term supply chain risk. Both are electrically equivalent.

Q: Can the S6012R be replaced with a higher voltage device like SCT151B-650R?

A: Yes. The 650V rating provides additional voltage margin and is electrically compatible. Applications designed for 600V operation will function correctly with a 650V-rated device. No circuit modifications are required.

Q: Are there any thermal considerations when substituting with higher current-rated devices?

A: Higher current ratings do not increase thermal dissipation in the same application. Thermal performance is determined by actual circuit current, not device rating. A TYN625RG operating at 12A generates identical heat to an S6012R at 12A.

Q: What is the significance of gate trigger voltage (Vgt) differences between parts?

A: Lower Vgt values (such as TYN612RG at 1.3V versus S6012R at 1.5V) indicate easier gate triggering with lower voltage requirements. This improves gate drive circuit efficiency but does not prevent operation with circuits designed for higher Vgt values.

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