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SMDJ100A-T7 Equivalent & Substitute Parts
Part Overview
The SMDJ100A-T7 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component operates with a 100V reverse standoff voltage and provides 162V maximum clamping voltage at peak pulse current. The part is Active status and RoHS3 compliant, with unlimited moisture sensitivity rating (MSL 1).
Substitute parts are identified when electrical parameters and mechanical compatibility align with the main part specifications, enabling direct replacement in circuit designs without functional degradation.
Substiute Parts
Key Parameters
| Parameter | SMDJ100A-T7 |
|---|---|
| Voltage - Reverse Standoff (Typ) | 100V |
| Voltage - Breakdown (Min) | 111V |
| Voltage - Clamping (Max) @ Ipp | 162V |
| Current - Peak Pulse (10/1000µs) | 18.5A |
| Power - Peak Pulse | 3000W |
| Package / Case | DO-214AB, SMC |
| Operating Temperature Range | -65°C to 150°C |
| Type | Zener |
| Unidirectional Channels | 1 |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the SMDJ100A-T7 is determined by the following critical parameters:
- Voltage - Reverse Standoff: 100V (exact match required)
- Voltage - Breakdown (Min): 111V (exact match required)
- Voltage - Clamping (Max) @ Ipp: 162V (exact match required)
- Package / Case: DO-214AB, SMC (exact match required)
- Type: Zener, Unidirectional (exact match required)
- Unidirectional Channels: 1 (exact match required)
Substitute parts may vary in Current - Peak Pulse and Power - Peak Pulse ratings, provided the substitute meets or exceeds the minimum electrical protection requirements. Operating temperature range and RoHS compliance are secondary considerations for substitution validity.
Parameter Comparison
| Parameter | SMDJ100A-T7 (Littelfuse) | SMCJ100A (Fairchild) | SMCJ100A-E3/57T (Vishay) | SMCJ100A-TP (MCC) | SMLJ100A (Bourns) |
|---|---|---|---|---|---|
| Voltage - Reverse Standoff (Typ) | 100V | 100V | 100V | 100V | 100V |
| Voltage - Breakdown (Min) | 111V | 111V | 111V | 111V | 111V |
| Voltage - Clamping (Max) @ Ipp | 162V | 162V | 162V | 162V | 162V |
| Current - Peak Pulse (10/1000µs) | 18.5A | 9.3A | 9.3A | 9.3A | 18.6A |
| Power - Peak Pulse | 3000W | 1500W | 1500W | 1500W | 3000W |
| Package / Case | DO-214AB, SMC | DO-214AB, SMC | DO-214AB, SMC | DO-214AB, SMC | DO-214AB, SMC |
| Operating Temperature Range | -65°C to 150°C | -55°C to 150°C | -55°C to 150°C | -55°C to 175°C | -55°C to 150°C |
| Type | Zener | Zener | Zener | Zener | Zener |
| RoHS Status | ROHS3 Compliant | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
All identified substitute parts meet the core electrical specifications (100V standoff, 111V breakdown minimum, 162V clamping) and package requirements (DO-214AB, SMC) for direct replacement with the SMDJ100A-T7.
SMCJ100A (Fairchild Semiconductor) and SMCJ100A-E3/57T (Vishay) provide reduced peak pulse current (9.3A) and power dissipation (1500W) compared to the main part. These substitutes are suitable for applications where lower transient energy levels are acceptable.
SMLJ100A (Bourns Inc.) matches the peak pulse current (18.6A) and power dissipation (3000W) of the main part, providing equivalent protection capability. This part is ROHS3 compliant and carries REACH Affected status.
SMCJ100A-TP (Micro Commercial Co) extends the operating temperature range to 175°C and is ROHS3 compliant, offering enhanced thermal performance for high-temperature environments.
Frequently Asked Questions (FAQ)
Q: Can SMCJ100A (9.3A) replace SMDJ100A-T7 (18.5A) in all applications?
A: SMCJ100A is electrically compatible for voltage protection but provides lower peak pulse current handling. Substitution is valid only when circuit transient energy levels do not exceed 1500W peak pulse power. Applications requiring full 3000W protection capability must use SMLJ100A or equivalent higher-current alternatives.
Q: Are all substitute parts available in Tape & Reel packaging?
A: SMCJ100A-E3/57T and SMCJ100A-TP are specified with Tape & Reel (TR) packaging. SMCJ100A (Fairchild) and SMLJ100A (Bourns) packaging specifications are not detailed in the provided data. Verify packaging availability with the supplier before procurement.
Q: What is the temperature range consideration for substitution?
A: The main part operates from -65°C to 150°C. Substitute parts operate from -55°C to 150°C (Fairchild, Vishay, Bourns) or -55°C to 175°C (MCC). Substitution is valid for applications within the -55°C to 150°C overlap range. Applications requiring -65°C minimum operation must use the original SMDJ100A-T7.
Q: Do all substitutes meet RoHS3 compliance?
A: SMDJ100A-T7, SMCJ100A-E3/57T, SMCJ100A-TP, and SMLJ100A are ROHS3 compliant. SMCJ100A (Fairchild) RoHS status is not specified in the provided data. Verify compliance documentation with the supplier if RoHS3 certification is a design requirement.
Q: Is the DO-214AB package identical across all parts?
A: All parts use DO-214AB (SMC) package designation. Physical dimensions and lead configurations are standardized for this package type, enabling direct PCB footprint compatibility without layout modifications.
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