Microchip MALCE28A

DESCRIPTION

This high-reliability plastic encapsulated Transient Voltage Suppressor (TVS) diode series for thru-hole mounting includes a rectifier diode element in series and in the opposite direction. This allows it to present a very low (< 100 pF) capacitance to the system it is protecting (see Figure 2). The low capacitance of these devices makes them particularly useful for protecting lines carrying high frequency signals. They are also useful in protecting from the secondary effects of lightning in airborne avionics per IEC61000-4-5, RTCA/DO-160G, and ARINC 429. If bidirectional transient capability is required, two of these low capacitance TVS devices may be used in parallel and opposite directions (anti-parallel) for complete ac protection.

FEATURES

• High reliability with fabrication and assembly lot traceability.
• All devices are 100% surge tested.
• Unidirectional construction. For bidirectional applications, use two in anti-parallel (see Figure 4).
• Suppresses transients up to 1500 watts @10/1000μs (see Figure 1).
• Working standoff voltage (VWM) range 6.5 V to 170 V.
• 5% and 10% tolerance options available
• Clamps transients in less than 100 pico seconds.*
• 3σ lot norm screening performed on standby current ID.
• Moisture classification is level 1 with no dry pack required per IPC/JEDEC J-STD-020B.
• Screening options available in reference to MIL-PRF-19500. See Part Nomenclature below for all available options, and to our Hi-Rel Non-Hermetic Products brochure on our web site for more details.
• RoHS compliant versions available.

APPLICATIONS / BENEFITS

• Protection from switching transients and induced RFI.
• Low capacitance for data line protection to 1 MHz.
• Protection for fast data rate lines in aircraft up to:
RTCA/DO-160G – level 5 Waveform 4 and Level 2 Waveform 5A in (also see MicroNote 130)
ARINC 429, Part 1, paragraph 2.4.1.1 with bit rates of 100 kb/s.
• Protection from ESD and EFT per IEC 61000-4-2 and IEC 61000-4-4.
• Secondary lightning protection per IEC 61000-4-5 with 42 Ohms source impedance:
Class 1: MLCE6.5A to MLCE170A
Class 2: MLCE6.5A to MLCE150A
Class 3: MLCE6.5A to MLCE70A
Class 4: MLCE6.5A to MLCE36A
• Secondary lightning protection per IEC 61000-4-5 with 12 Ohms source impedance:
Class 1: MLCE6.5A to MLCE90A
Class 2: MLCE6.5A to MLCE45A
Class 3: MLCE6.5A to MLCE22A
Class 4: MLCE6.5A to MLCE11A
• Secondary lightning protection per IEC 61000-4-5 with 2 Ohms source impedance:
Class 2: MLCE6.5A to MLCE20A
Class 3: MLCE6.5A to MLCE10A