1N5527B (DO35)

Overview

The Microsemi 1N5527B is a 0.5 W axial-leaded glass Zener Voltage Regulator with a nominal voltage of 7.5 V at a test current of 1.0 mA. It features a maximum dynamic impedance of 35 Ohms and a maximum reverse leakage current of 6.0 µA at 6 V. The device operates within a junction temperature range of -65°C to +175°C, has a forward voltage of 1.1 V at 200 mA, and utilizes a hermetically sealed DO-35 (DO-204AH) package.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range.
• Features minimal capacitance for high-frequency applications.
• Inherently radiation hard as described in Microsemi documentation.
• Nonsensitive to electrostatic discharge per MIL-STD-750 Method 1020.

Applications

• Voltage regulation over broad operating currents
• Reference voltage sources
• Protection circuits

Procurement Notes

Verify the specific suffix requirements against the datasheet nomenclature. The standard JEDEC designation implies a ±20% tolerance; the 'B' suffix indicates a tighter ±5% tolerance. Confirm if military qualification levels such as JAN, JANTX, or JANTXV are required, as these necessitate a metallurgical bond option indicated by a '-1' suffix. Ensure RoHS compliance needs are addressed for commercial grades.

Selection Notes

Select this component when a 7.5 V reference is needed in a low-power application. The DO-35 package supports through-hole mounting. Consider the thermal resistance values for derating calculations. Verify that the required tolerance matches the B suffix specification. Check if radiation hardness or ESD immunity is critical for the target environment.

Part Context

This part belongs to the 1N5518B thru 1N5546B series of 0.5 watt Zener diodes. The series covers voltages from 3.3 V to 33 V. These devices are available in various tolerances and can be qualified to MIL-PRF-19500/437 standards. They are designed for general-purpose voltage regulation tasks requiring reliable performance in harsh environments.

Replacement Considerations

Cross-reference with other manufacturers offering 1N5527 equivalents. Verify electrical parameters such as Zener voltage, impedance, and leakage current match the original specifications. Ensure the replacement package type and pinout are compatible with the existing design.

FAQ

What does the 'B' suffix indicate for the 1N5527?

The 'B' suffix denotes a voltage tolerance of plus/minus 5%. Without a suffix, the standard tolerance is plus/minus 20%.

Is the 1N5527B available in a surface mount package?

Yes, the series is also available in a DO-213AA MELF surface mount package, designated with a 'BUR-1' suffix.

How is the polarity identified on the device?

The cathode is indicated by a band on the glass body. For Zener regulation, the banded end should be positive with respect to the opposite end.