TPSMP27AHM3J/84A vs NS6A28AFT3G
| Part Number |
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| Category | TVS - Diodes | TVS - Diodes |
| Manufacturer | Vishay Semiconductor - Diodes Division | Littelfuse Inc. |
| Description | TVS DIODE 37.5VC 10.7A DO220AA | TVS DIODE 45.4VC 13.2A SMA-FL |
| Package | DO-220AA | DO-221AC, SMA Flat Leads |
| Series | Automotive, AEC-Q101, PAR?, eSMP? | - |
| Type | Zener | Zener |
| Operating Temperature | -65°C ~ 185°C (TJ) | -65°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | DO-220AA | DO-221AC, SMA Flat Leads |
| Supplier Device Package | DO-220AA (SMP) | SMA-FL |
| Applications | Automotive | General Purpose |
| Unidirectional Channels | 1 | 1 |
| Voltage - Reverse Standoff (Typ) | 23.1V | 28V (Max) |
| Voltage - Breakdown (Min) | 25.7V | 31.1V |
| Voltage - Clamping (Max) @ Ipp | 37.5V | 45.4V |
| Current - Peak Pulse (10/1000µs) | 10.7A | 13.2A |
| Power - Peak Pulse | 400W | 500W |
| Power Line Protection | No | No |
| Capacitance @ Frequency | - | 590pF @ 1MHz |
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1. TVS is the abbreviation of diode. What does it mean?
TVS is the abbreviation of Transient Voltage Suppressor, also known as Transient Voltage Suppression Diode.
How TVS diodes work
TVS diodes work using the avalanche breakdown effect. When the TVS diode receives a reverse voltage, the depletion layer near its PN junction will increase, causing the electric field intensity to increase, which in turn triggers the avalanche effect and causes the reverse current to increase sharply. Unlike ordinary diodes, TVS diodes can recover after avalanche breakdown and continue to work normally. -
2. How do TVS diodes fail?
The failure modes of TVS diodes mainly include short circuit failure, open circuit failure and performance degradation. These failure modes can have a serious impact on the normal operation and protection functions of the circuit.
short circuit fault
Short circuit failure is one of the most common failure modes of TVS diodes. When a TVS diode is short-circuited, it changes to a low-impedance state, allowing a large amount of current to pass through, which may cause the circuit to not function properly and may even damage other circuit components. Causes of short circuit faults include:
Thermal breakdown: In a high temperature environment or when subjected to excessive transient energy impact, the PN junction of the TVS diode may undergo thermal breakdown, resulting in a short circuit.
Over-electrical stress: When the transient pulse energy exceeds the energy that the TVS can withstand, it will cause over-electrical stress damage and even directly cause burnout.
Manufacturing process issues: Such as chip bonding interface voids, mesa defects, strong accumulation layer or strong inversion layer on the surface, chip cracks, uneven impurity diffusion, etc., which may cause short circuit failures of TVS diodes during manufacturing or use.
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3. What is the difference between TVS diodes and MOVs?
The main differences between TVS diodes and MOV varistors lie in their working principles, application scenarios and performance parameters.
Working principle
TVS diode: TVS diode (Transient Voltage Suppressor) is a semiconductor device with a high-sensitivity N/P junction. When the reverse voltage exceeds its breakdown voltage, the TVS diode will conduct quickly and introduce the surge current into the ground, thereby protecting the subsequent circuit. The response speed of TVS diodes is very fast, usually within nanoseconds.
MOV varistor: MOV varistor (Metal-Oxide Varistor) is a multi-layer varistor made of multi-layer zinc oxide material. When the voltage exceeds its varistor voltage, the MOV will conduct, absorb the surge energy, and clamp the voltage within a safe range. MOV has a long response time, usually completing the response within microseconds.
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4. How fast are TVS diodes?
TVS diodes are very fast and can respond within 10^-12 seconds (i.e. 1 nanosecond). When the two poles of the TVS diode are impacted by reverse transient high energy, it can change the high impedance between its two poles into low impedance in a very short time, while absorbing surge power up to several kilowatts, reducing the voltage between the two poles. It is clamped to a predetermined safe value, thereby effectively protecting precision components in electronic circuits from damage by various surge pulses.
This fast response characteristic of TVS diodes allows them to play an important role in various electronic systems, especially where precision electronic components need to be protected from transient voltage impacts. For example, in the fields of computer systems, communication equipment, automotive electronics, household appliances, etc., TVS diodes are widely used to protect circuits from electrostatic discharge, surge voltage, and electromagnetic interference.
