Overview
The SMAJ18A-TR is a unidirectional Transil Diode manufactured by STMicroelectronics. It is designed to protect sensitive equipment against transient overvoltages, electrostatic discharges, and electrical overstress. This diode is part of the SMAJ series, which is compliant with various international standards including IEC 61000-4-2, IEC 61000-4-4, and MIL STD 883, method 3015.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Clamp Voltage | 39.3 | V |
| Peak Pulse Current (Ipp) | 59 | A (8/20µs) |
| Peak Pulse Power (PPP) | 400 | W (10/1000µs) |
| Reverse Stand-off Voltage (VWM) | 18 | V |
| Maximum Reverse Leakage Current at VWM | 1.0 | μA |
| Package Type | DO-214AC (SMA) | |
| Maximum Junction Temperature | 150 | °C |
Key Features
- Low profile package, ideal for automated placement.
- Glass passivated chip junction for enhanced reliability.
- Excellent clamping capability and very fast response time.
- Low incremental surge resistance.
- Meets MSL level 1, per J-STD-020, with a maximum peak of 260 °C.
- Available in RoHS-compliant and halogen-free versions.
- Solderable leads per J-STD-002 and JESD 22-B102).
Applications
The SMAJ18A-TR is suitable for protecting sensitive electronic equipment in various applications, including:
- Protection against electrostatic discharges (ESD) and electrical overstress (EOS).
- Use in automotive, industrial, and consumer electronics where transient voltage protection is critical.
- Protection of power supplies, data lines, and other sensitive circuits from voltage spikes and surges).
Q & A
- What is the primary function of the SMAJ18A-TR diode?
The SMAJ18A-TR diode is designed to protect sensitive equipment against transient overvoltages, electrostatic discharges, and electrical overstress.
- What is the clamp voltage of the SMAJ18A-TR?
The clamp voltage of the SMAJ18A-TR is 39.3V.
- What is the peak pulse current (Ipp) of the SMAJ18A-TR?
The peak pulse current (Ipp) of the SMAJ18A-TR is 59A (8/20µs).
- What is the peak pulse power (PPP) of the SMAJ18A-TR?
The peak pulse power (PPP) of the SMAJ18A-TR is 400W (10/1000µs).
- What package type does the SMAJ18A-TR use?
The SMAJ18A-TR uses the DO-214AC (SMA) package type.
- What is the maximum junction temperature of the SMAJ18A-TR?
The maximum junction temperature of the SMAJ18A-TR is 150°C.
- Is the SMAJ18A-TR RoHS-compliant?
- What standards does the SMAJ18A-TR comply with?
The SMAJ18A-TR complies with IEC 61000-4-2, IEC 61000-4-4, and MIL STD 883, method 3015.
- What are some common applications of the SMAJ18A-TR?
The SMAJ18A-TR is used in automotive, industrial, and consumer electronics for protecting against ESD and EOS.
- What is the reverse stand-off voltage (VWM) of the SMAJ18A-TR?
The reverse stand-off voltage (VWM) of the SMAJ18A-TR is 18V.
