S2012R Equivalent & Substitute Parts

Part Overview

The S2012R is a Standard Recovery SCR (Silicon Controlled Rectifier) rated for 200V off-state voltage and 12A RMS current, manufactured by Littelfuse Inc. in a TO-220-3 through-hole package. This component is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The S2012R serves as a thyristor switch in power control applications requiring moderate voltage and current ratings. Due to its obsolete status, identifying compatible alternatives ensures design continuity and supply chain reliability.

Substiute Parts

S2012R

Littelfuse Inc.In Stock: 703S2012R Datasheet

Current PartRFQ

S4012R

LittelfuseIn Stock: 1123S4012R Datasheet

UpgradeRFQ

TYN612RG

STMicroelectronicsIn Stock: 4921TYN612RG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the S2012R is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Package / Case: TO-220-3 (through-hole mounting)
• SCR Type: Standard Recovery
• Operating Temperature Range: -40°C to 125°C minimum
• RoHS3 Compliance: Required for modern supply chains
• Current - On State (It RMS): 12A minimum

Voltage Rating Consideration: The S2012R operates at 200V off-state voltage. Substitute parts may have equal or higher voltage ratings, as higher-rated devices remain functional in lower-voltage applications with appropriate circuit design.

Gate Trigger Parameters: Gate trigger voltage (Vgt) and current (Igt) must be compatible with existing gate drive circuitry. Variations within the specified ranges are acceptable.

Two substitute parts are identified:

S4012R (Upgrade Path): Maintains identical gate trigger specifications and current ratings while increasing voltage rating to 400V. Identical package and thermal characteristics.

TYN612RG (Manufacturer Recommended): STMicroelectronics equivalent with enhanced specifications including higher voltage rating (600V), improved gate trigger characteristics (lower Vgt and Igt), and higher surge current capability. Active product status ensures long-term availability.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Voltage Rating): The S4012R provides a direct upgrade path with identical electrical characteristics at the gate and load terminals while doubling the voltage rating to 400V. This part maintains full compatibility with existing S2012R designs. However, S4012R is discontinued at DiGi Electronics, limiting long-term availability.

For Long-Term Supply Assurance: The TYN612RG is the manufacturer-recommended substitute with Active product status, ensuring sustained availability and supply chain reliability. This STMicroelectronics part exceeds S2012R specifications across multiple parameters: 600V voltage rating, lower gate trigger requirements (1.3V / 15mA), reduced hold current (30mA), and enhanced surge current capability (140A / 145A at 50Hz). All three parts maintain identical RoHS3 compliance and operating temperature range.

The TYN612RG's higher voltage rating and improved gate characteristics make it suitable for applications requiring enhanced performance margins or simplified gate drive circuitry.

Frequently Asked Questions (FAQ)

Q: Can the S4012R be used as a direct replacement for the S2012R? A: Yes. The S4012R maintains identical gate trigger voltage (1.5V), gate trigger current (20mA), on-state voltage (1.6V), hold current (40mA), and RMS current rating (12A). The doubled voltage rating (400V vs 200V) does not prevent operation in 200V applications. However, S4012R availability is limited due to discontinued status.

Q: Is the TYN612RG compatible with S2012R designs? A: Yes, with circuit verification. The TYN612RG shares the same TO-220-3 package, RMS current rating (12A), and operating temperature range. Gate trigger specifications are improved (lower Vgt and Igt), which may require gate drive circuit adjustment. The 600V rating provides additional voltage margin. Active product status ensures long-term procurement viability.

Q: What are the key differences between S4012R and TYN612RG? A: Both are compatible substitutes with different manufacturers and specifications. S4012R (Littelfuse) maintains identical gate characteristics to the original S2012R but has limited availability. TYN612RG (STMicroelectronics) offers enhanced performance with lower gate trigger requirements, reduced leakage current, and higher surge capability, with confirmed Active status for sustained supply.

Q: Does package compatibility affect substitution? A: All three parts use TO-220-3 through-hole packages with identical pinout and thermal characteristics. No PCB layout modifications are required for mechanical compatibility.

Q: Are all substitute parts RoHS3 compliant? A: Yes. The S2012R, S4012R, and TYN612RG are all ROHS3 Compliant, meeting current environmental and regulatory requirements.

Q: Which substitute should be selected for new designs? A: The TYN612RG is recommended for new designs due to Active product status, improved electrical characteristics, and long-term availability assurance. For existing designs requiring minimal circuit changes, the S4012R provides the closest electrical match, subject to availability constraints.