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S12KC Equivalent & Substitute Parts
Part Overview
The S12KC is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 800 V DC reverse voltage with 12 A average rectified current. The device is packaged in DO-214AB (SMC) surface mount configuration and is classified as Active product status with RoHS3 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or application-specific requirements within the allowed parameter ranges.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - DC Reverse (Vr) (Max) | 800 | V |
| Current - Average Rectified (Io) | 12 | A |
| Package / Case | DO-214AB, SMC | — |
| Mounting Type | Surface Mount | — |
| Operating Temperature - Junction | -55 to 150 | °C |
| Technology | Standard | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the S12KC are identified based on strict electrical and mechanical compatibility criteria. The primary substitution parameter is the package type: both the main part and substitute must use DO-214AB (SMC) surface mount packaging to ensure mechanical and thermal compatibility on printed circuit boards. The voltage rating must match or exceed the 800 V DC reverse voltage specification. The current rating and recovery speed characteristics are secondary parameters that define functional equivalence within application contexts.
The RS3K-E3/57T from Vishay General Semiconductor - Diodes Division shares the identical 800 V voltage rating and DO-214AB package configuration. However, the current rating differs: RS3K-E3/57T is rated for 3 A average rectified current, compared to the S12KC's 12 A rating. This difference establishes a one-directional substitution relationship: the S12KC cannot substitute for RS3K-E3/57T in applications requiring 3 A or less, while RS3K-E3/57T cannot substitute for S12KC in applications requiring currents above 3 A.
Parameter Comparison
| Parameter | S12KC (Taiwan Semiconductor) | RS3K-E3/57T (Vishay) | Unit |
|---|---|---|---|
| Voltage - DC Reverse (Vr) (Max) | 800 | 800 | V |
| Current - Average Rectified (Io) | 12 | 3 | A |
| Current - Reverse Leakage @ Vr | 1 µA @ 800 V | 10 µA @ 800 V | µA |
| Capacitance @ Vr, F | 78 pF @ 4V, 1MHz | 34 pF @ 4V, 1MHz | pF |
| Package / Case | DO-214AB, SMC | DO-214AB, SMC | — |
| Mounting Type | Surface Mount | Surface Mount | — |
| Operating Temperature - Junction | -55 to 150 | -55 to 150 | °C |
| Technology | Standard | Standard | — |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | — |
Engineering Selection Recommendations
Both the S12KC and RS3K-E3/57T meet RoHS3 compliance and REACH unaffected status, establishing regulatory equivalence for applications subject to these standards. Both devices operate across the identical temperature range of -55°C to 150°C junction temperature and share MSL Level 1 classification, indicating no moisture sensitivity constraints during storage and handling.
The S12KC is suitable for applications requiring 12 A average rectified current at 800 V reverse voltage. The RS3K-E3/57T is suitable for applications requiring 3 A or less at the same voltage rating. Selection between these parts depends on the specific current requirement of the application circuit. The identical package and mounting type ensure footprint compatibility on PCB layouts designed for DO-214AB surface mount components.
Frequently Asked Questions (FAQ)
Q: Can RS3K-E3/57T replace S12KC in all applications?
A: No. RS3K-E3/57T is rated for 3 A average rectified current, while S12KC is rated for 12 A. RS3K-E3/57T cannot be used in applications requiring current above 3 A. Substitution is valid only for applications with current requirements at or below 3 A.
Q: Can S12KC replace RS3K-E3/57T?
A: Yes, from an electrical and mechanical standpoint. S12KC provides higher current capacity (12 A versus 3 A) and lower reverse leakage current (1 µA versus 10 µA) at the same 800 V voltage rating. Both share identical package type, temperature range, and compliance certifications.
Q: Are the DO-214AB packages identical between both parts?
A: Yes. Both S12KC and RS3K-E3/57T use DO-214AB (SMC) surface mount packaging. PCB footprints and reflow soldering profiles are mechanically compatible.
Q: What is the difference in recovery speed between these parts?
A: S12KC is specified as Standard Recovery (>500 ns). RS3K-E3/57T is specified as Fast Recovery (≤500 ns) with reverse recovery time of 500 ns. This difference affects switching characteristics in high-frequency applications.
Q: Are both parts RoHS compliant?
A: Yes. Both S12KC and RS3K-E3/57T are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for restricted substance use.
Q: What is the operating temperature range for both parts?
A: Both parts operate across -55°C to 150°C junction temperature, providing identical thermal operating windows for circuit design.
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