SMLJ20CA

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TVS – Diodes are one of the most important components of any electrical circuit, and the SMLJ20CA is a particularly effective one. This device is a transient-voltage-suppressor (TVS) diode, meaning it provides a near instantaneous response to any voltage transients present in the circuit, allowing them to be limited quickly and within acceptable bounds. It is an inexpensive solution to transients, with both single and dual capacitors available.

The SMLJ20CA has a peak stand-off voltage of 20V, and a breakdown voltage of 16.7V. This means it is ideal for supplying enhanced protection to circuits operating at lower voltages, typically between 5V and 12V. It is suited to use in automotive, telecommunications, consumer and computer applications to provide protection from electro-magnetic interference (EMI) and other voltage transients.

It is also designed for use in mixed-signal (analog and digital) applications. In these applications, it will protect the digital integrated circuits from over-voltage transients, while not affecting the analog ones. This is achieved through its low capacitance of 0.03 pF. By comparison, a typical alternate diode may have capacitance of up to 0.5 pF.

The SMLJ20CA achieves its performance through its novel ‘Chip-on-Lead’ (COL) construction. First, the diode chip is mounted on the lead frame. It is then connected to the central portion of the frame with a high melt index (HMI) epoxy. The epoxy not only provides the requisite electrical connections but also helps to dissipate the energy quickly, allowing the diode to operate effectively in high-impedance circuits.

Additionally, the chip itself has a patented ‘on-lead’ design, which helps ensure its mechanical strength and provides greater stability throughout its operating life. Finally, a polymeric layer is applied to the bottom of the diode chip to protect it from mechanical shock or vibration, providing excellent environmental protection for this sensitive device.

The SMLJ20CA also provides low leakage over the entire operating temperature range of -65C to 150C. This enables it to operate reliably in a wide range of temperatures, thereby extending the life-span of the circuit. Additionally, its fast arc-over time ensures that the voltages remain within the safe range, thus eliminating the need for additional components in the circuit.

Overall, the SMLJ20CA is an effective and reliable TVS diode, providing the perfect combination of features for use in low-voltage circuits. ItsCOL construction ensures its enhanced protection and long-lasting performance. Its low leakage and fast arc-over times ensure its reliability in a wide range of applications. Finally, its low-cost design makes it an attractive choice for any circuit needing more voltage protection.

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