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SMAJ100 Equivalent & Substitute Parts
Part Overview
The SMAJ100 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 100V reverse standoff voltage with a 170.1V maximum clamping voltage and 2.5A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ100 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility within specified electrical and mechanical parameters.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 100V | V |
| Voltage - Breakdown (Min) | 105.3V | V |
| Voltage - Clamping (Max) @ Ipp | 170.1V | V |
| Current - Peak Pulse (10/1000µs) | 2.5A | A |
| Power - Peak Pulse | 400W | W |
| Package / Case | DO-214AC, SMA | — |
| Operating Temperature | -65°C ~ 150°C | °C (TJ) |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the SMAJ100 is determined by the following critical parameters:
- Voltage - Reverse Standoff (Typ): Must be 100V to maintain circuit protection threshold
- Package / Case: Must be DO-214AC (SMA) for mechanical and electrical compatibility
- Type: Must be Zener unidirectional TVS diode
- Unidirectional Channels: Must be 1 channel
- Voltage - Clamping (Max) @ Ipp: Acceptable range 162V to 179V (within circuit tolerance)
- Current - Peak Pulse (10/1000µs): Acceptable range 2.0A to 3.1A (equal or greater capability)
- Power - Peak Pulse: Acceptable range 400W to 500W (equal or greater capability)
- RoHS Status: Must be ROHS3 Compliant
- Moisture Sensitivity Level (MSL): Must be 1 (Unlimited)
Substitute parts are grouped into two categories based on electrical performance:
Group A (100V Standoff): SMAJ100A (MDD), SMAJ100A-13-F (Diodes Incorporated), SMAJ100A-TP (Micro Commercial Co), SMAJ100AE3/TR13 (Microchip Technology), SMAJ100E3/TR13 (Microchip Technology), TV04A101J-G (Comchip Technology)
Group B (120V Standoff): SMAJ120A-13-F (Diodes Incorporated) — suitable only for applications where higher standoff voltage is acceptable
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SMAJ100 | Littelfuse Inc. | 100V | 105.3V | 170.1V | 2.5A | 400W | -65°C ~ 150°C (TJ) | Obsolete | ROHS3 Compliant |
| SMAJ100A | MDD | 100V | 111V | 162V | 2.5A | 400W | -50°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMAJ100A-13-F | Diodes Incorporated | 100V | 111V | 162V | 2.5A | 400W | -55°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMAJ100A-TP | Micro Commercial Co | 100V | 111V | 162V | 2.5A | 400W | -55°C ~ 175°C (TA) | Active | ROHS3 Compliant |
| SMAJ100AE3/TR13 | Microchip Technology | 100V | 111V | 162V | 3.1A | 500W | -65°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMAJ100E3/TR13 | Microchip Technology | 100V | 111V | 179V | 2.8A | 500W | -65°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMAJ120A-13-F | Diodes Incorporated | 120V | 133V | 193V | 2A | 400W | -55°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| TV04A101J-G | Comchip Technology | 100V | 111V | 162V | 2.47A | 400W | -55°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
Engineering Selection Recommendations
All substitute parts listed are active products with ROHS3 compliance and MSL 1 (Unlimited) rating, meeting regulatory and environmental requirements.
Primary Substitutes (100V Standoff, Direct Electrical Equivalence): SMAJ100A (MDD), SMAJ100A-13-F (Diodes Incorporated), SMAJ100A-TP (Micro Commercial Co), TV04A101J-G (Comchip Technology) provide equivalent 100V standoff voltage with clamping voltages between 162V and matching 2.5A peak pulse current. These parts are suitable for direct replacement in applications where the original SMAJ100 specifications are required.
Enhanced Performance Substitutes (100V Standoff, Increased Capability): SMAJ100AE3/TR13 (Microchip Technology) offers increased peak pulse current (3.1A) and power dissipation (500W) while maintaining 100V standoff voltage. SMAJ100E3/TR13 (Microchip Technology) provides higher clamping voltage (179V) and increased power dissipation (500W) with 100V standoff voltage. These parts are suitable for applications requiring higher transient energy absorption.
Alternative Standoff Voltage: SMAJ120A-13-F (Diodes Incorporated) features 120V standoff voltage with higher clamping voltage (193V) and reduced peak pulse current (2A). This part is suitable only for applications where higher standoff voltage is acceptable and lower peak pulse current is tolerable.
Temperature Range Considerations: SMAJ100A-TP extends the upper ambient temperature limit to 175°C (TA), suitable for high-temperature environments. SMAJ100AE3/TR13 and SMAJ100E3/TR13 maintain the original -65°C lower temperature limit, matching the SMAJ100 specification.
Frequently Asked Questions (FAQ)
Q: Can SMAJ100A (MDD) directly replace SMAJ100 (Littelfuse Inc.)? A: Yes. Both parts share identical 100V reverse standoff voltage, DO-214AC (SMA) package, and equivalent peak pulse current (2.5A). The clamping voltage of SMAJ100A (162V) is within acceptable tolerance compared to SMAJ100 (170.1V). Both are ROHS3 compliant with MSL 1 rating.
Q: What is the difference between SMAJ100AE3/TR13 and SMAJ100E3/TR13? A: Both are Microchip Technology products with 100V standoff voltage in DO-214AC (SMA) package. SMAJ100AE3/TR13 provides 3.1A peak pulse current and 500W power dissipation with 162V clamping voltage. SMAJ100E3/TR13 provides 2.8A peak pulse current and 500W power dissipation with 179V clamping voltage. Selection depends on whether peak current or clamping voltage is the limiting factor in the application.
Q: Is SMAJ120A-13-F compatible with SMAJ100 applications? A: SMAJ120A-13-F has a higher 120V reverse standoff voltage compared to SMAJ100's 100V. This part is suitable only for applications where the higher standoff voltage does not interfere with circuit operation. The reduced peak pulse current (2A versus 2.5A) may be limiting in high-transient-energy applications.
Q: Do all substitute parts use the same DO-214AC (SMA) package? A: Yes. All listed substitute parts use DO-214AC (SMA) surface-mount package, ensuring mechanical compatibility with SMAJ100 PCB layouts.
Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting current environmental and regulatory requirements.
Q: Which substitute offers the best thermal performance? A: SMAJ100A-TP (Micro Commercial Co) extends the upper ambient temperature limit to 175°C (TA), compared to 150°C for most other substitutes. This part is recommended for applications in elevated-temperature environments.
Q: Can I use TV04A101J-G as a substitute? A: Yes. TV04A101J-G (Comchip Technology) provides 100V standoff voltage with 162V clamping voltage and 2.47A peak pulse current, meeting SMAJ100 functional requirements. The part is ROHS3 compliant with MSL 1 rating.
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