1N5388B

Overview

The onsemi 1N5388B is a silicon-oxide passivated Zener voltage regulator diode belonging to the 5 Watt Surmetic 40 series. It provides a nominal reverse Zener voltage of 200 V with a ±5% tolerance, tested at a current of 5 mA. The device features a maximum Zener impedance of 480 Ω and a maximum reverse leakage current of 0.5 µA at 152 V. It supports a maximum DC Zener current of 23.6 mA and can withstand a non-repetitive surge current of up to 23.6 A for an 8.3 ms pulse width. The component operates within a junction temperature range of -65°C to +200°C.

Feature Summary

• Utilizes silicon-oxide passivated junctions for superior operating characteristics and tight electrical limits.
• Encapsulated in a void-free, transfer-molded thermosetting plastic package resistant to common environmental conditions.
• Offers high ESD protection rated at Class 3 (>16 kV) per the Human Body Model.

Applications

• Voltage regulation across broad operating current and temperature ranges.
• Overvoltage protection circuits requiring robust transient handling capabilities.
• Power supply designs utilizing axial lead mounting configurations.

Procurement Notes

Verify that the ordered part number matches the specific JEDEC registration requirements for the 1N5388B designation. Confirm package availability, noting that Pb-Free options exist with a 'G' suffix. Ensure thermal management strategies align with the specified junction-to-lead thermal resistance values for the intended application environment.

Selection Notes

Select this component when a precise 200 V regulation point is required within the 5 Watt power dissipation class. Consider the 480 Ω dynamic impedance for applications sensitive to voltage variations under load changes. Evaluate the thermal resistance characteristics against the expected ambient temperatures to ensure the junction temperature remains within the specified operational limits during continuous operation.

Part Context

This device is part of the comprehensive 1N53 Series, which covers a wide voltage spectrum from 3.3 V to 200 V. All members share the same Surmetic 40 axial lead package and utilize identical manufacturing processes based on silicon-oxide passivation. This standardization ensures consistent mechanical and thermal performance across the entire product family.

Replacement Considerations

Cross-reference with other manufacturers offering the 1N5388B JEDEC type number. Verify that substitute components meet the exact 200 V nominal voltage, ±5% tolerance, and 5 W power rating specifications to maintain circuit integrity without redesigning the thermal or electrical layout.

FAQ

What is the maximum non-repetitive surge current for the 1N5388B?

The maximum non-repetitive surge current is 23.6 A, measured as a square-wave pulse with a width of 8.3 ms at an ambient temperature of 25°C.

How is polarity indicated on the 1N5388B package?

Polarity is identified by a cathode band printed on the external surface of the plastic case.