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SMAJ20CA-M3/61 Equivalent & Substitute Parts
Part Overview
The SMAJ20CA-M3/61 is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This bidirectional Zener diode operates in the DO-214AC (SMA) surface mount package and is designed for general-purpose transient voltage suppression applications. The part is Active status and RoHS3 compliant. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part number becomes unavailable or when alternative manufacturers' offerings meet the same electrical and mechanical specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 20 | V |
| Voltage - Breakdown (Min) | 22.2 | V |
| Voltage - Clamping (Max) @ Ipp | 32.4 | V |
| Current - Peak Pulse (10/1000µs) | 12.3 | A |
| Power - Peak Pulse | 400 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AC, SMA | - |
| Mounting Type | Surface Mount | - |
| RoHS Status | ROHS3 Compliant | - |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | - |
Substitute Part Grouping Explanation
Substitute parts for the SMAJ20CA-M3/61 are classified into two categories based on electrical parameter alignment:
Category 1: Direct Electrical Equivalents Parts that maintain identical electrical specifications across all critical parameters: Voltage - Reverse Standoff (20V), Voltage - Breakdown (22.2V minimum), Voltage - Clamping (32.4V maximum), Current - Peak Pulse (12.3A at 10/1000µs), and Power - Peak Pulse (400W). These parts are sourced from different manufacturers but deliver equivalent performance in the same application context.
Category 2: Manufacturer-Recommended Alternatives Parts that share the same Voltage - Reverse Standoff (20V) and Voltage - Breakdown (22.2V minimum) but feature higher clamping voltage and peak pulse current ratings. These parts are recommended by manufacturers as functional alternatives where enhanced transient suppression capability is acceptable or beneficial.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown Min (V) | Voltage - Clamping Max @ Ipp (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temperature (°C) | Package |
|---|---|---|---|---|---|---|---|---|
| SMAJ20CA-M3/61 | Vishay General Semiconductor | 20 | 22.2 | 32.4 | 12.3 | 400 | -55 to 150 (TJ) | DO-214AC, SMA |
| SMAJ20CA-E3/61 | Vishay General Semiconductor | 20 | 22.2 | 32.4 | 12.3 | 400 | -55 to 150 (TJ) | DO-214AC, SMA |
| SMAJ20CA | MDD | 20 | 22.2 | 32.4 | 12.3 | 400 | -50 to 150 (TJ) | DO-214AC, SMA |
| SMAJ20CA-13-F | Diodes Incorporated | 20 | 22.2 | 32.4 | 12.3 | 400 | -55 to 150 (TJ) | DO-214AC, SMA |
| SMAJ20CA-TP | Micro Commercial Co | 20 | 22.2 | 32.4 | 12.3 | 400 | -55 to 175 (TA) | DO-214AC, SMA |
| SM4T23CAY | STMicroelectronics | 20 | 22.2 | 42.8 | 54 (8/20µs) | 400 | -55 to 150 (TJ) | DO-214AC, SMA |
| SMA6J20CA-TR | STMicroelectronics | 20 | 22.2 | 36.8 | 93 (8/20µs) | 600 | -55 to 175 (TJ) | DO-214AC, SMA |
Engineering Selection Recommendations
Direct Equivalents (Category 1): SMAJ20CA-E3/61, SMAJ20CA, SMAJ20CA-13-F, and SMAJ20CA-TP are direct electrical equivalents suitable for one-to-one replacement with SMAJ20CA-M3/61. All parts maintain identical voltage and current ratings. Selection among these equivalents should be based on:
- Packaging availability (Tape & Reel vs. bulk)
- Inventory status and lead time
- Manufacturer certification requirements (RoHS3 compliance confirmed for all)
- Operating temperature range requirements (SMAJ20CA-TP supports extended temperature to 175°C)
Manufacturer-Recommended Alternatives (Category 2): SM4T23CAY and SMA6J20CA-TR are manufacturer-recommended alternatives that share the same reverse standoff and breakdown voltages but provide enhanced transient suppression performance through higher clamping voltage and peak pulse current ratings. These parts are suitable when:
- Enhanced transient suppression margin is required
- The application can tolerate higher clamping voltage (42.8V for SM4T23CAY, 36.8V for SMA6J20CA-TR)
- Higher peak pulse current handling is beneficial (54A and 93A respectively)
- Extended temperature operation is needed (SMA6J20CA-TR to 175°C)
All substitute parts are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the primary part's compliance profile.
Frequently Asked Questions (FAQ)
Q: Can SMAJ20CA-E3/61 be used as a direct replacement for SMAJ20CA-M3/61? A: Yes. SMAJ20CA-E3/61 is a direct electrical equivalent with identical voltage ratings (20V reverse standoff, 22.2V breakdown minimum, 32.4V clamping maximum), current rating (12.3A peak pulse), and power rating (400W). Both are manufactured by Vishay General Semiconductor and packaged in DO-214AC (SMA). The primary difference is packaging format (Tape & Reel designation).
Q: What is the difference between the direct equivalents and manufacturer-recommended alternatives? A: Direct equivalents (SMAJ20CA-E3/61, SMAJ20CA, SMAJ20CA-13-F, SMAJ20CA-TP) maintain identical electrical specifications. Manufacturer-recommended alternatives (SM4T23CAY, SMA6J20CA-TR) share the same reverse standoff and breakdown voltages but feature higher clamping voltage and peak pulse current ratings, providing enhanced transient suppression capability. Selection depends on whether the application requires exact parameter matching or can benefit from improved performance margins.
Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed carry RoHS3 compliance certification, matching the primary part SMAJ20CA-M3/61.
Q: Can SM4T23CAY or SMA6J20CA-TR be used in applications designed for SMAJ20CA-M3/61? A: These parts are manufacturer-recommended alternatives suitable for applications where the higher clamping voltage and peak pulse current do not create design conflicts. The shared reverse standoff (20V) and breakdown voltage (22.2V minimum) ensure compatibility with the same transient voltage levels. However, circuit design review is necessary to confirm that the higher clamping voltage (42.8V for SM4T23CAY, 36.8V for SMA6J20CA-TR) does not exceed protected component voltage ratings.
Q: What is the significance of the different temperature ratings among substitute parts? A: Operating temperature range affects part suitability for specific environmental conditions. SMAJ20CA-M3/61 operates from -55°C to 150°C (junction temperature). SMAJ20CA-TP extends to 175°C, and SMA6J20CA-TR also reaches 175°C, making these options suitable for high-temperature applications. SMAJ20CA (MDD) operates from -50°C to 150°C, which may not be suitable for applications requiring full -55°C minimum temperature operation.
Q: Are all substitute parts available in Tape & Reel packaging? A: Most substitute parts are available in Tape & Reel (TR) packaging. SMAJ20CA (MDD) does not specify packaging format in the provided data. Packaging format should be confirmed with the supplier when procurement specifications require Tape & Reel delivery.
Q: What is the MSL rating for all substitute parts? A: All substitute parts carry MSL 1 (Unlimited) moisture sensitivity level, identical to SMAJ20CA-M3/61. This rating indicates no moisture sensitivity restrictions and unlimited shelf life under normal storage conditions.
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