1N5531BUR-1

Overview

The Microchip Technology 1N5531BUR-1 is a low voltage avalanche Zener diode with a nominal breakdown voltage of 11 V at a test current of 1 mA. It operates within a power dissipation limit of 0.5 W and features a ±5% voltage tolerance. The device utilizes a hermetically sealed DO-213AA (MELF) surface mount package with end-cap terminals. Electrical specifications include a maximum reverse leakage current of 9 µA at 9.9 V, a dynamic impedance of 80 Ω, and a forward voltage of 1.1 V at 200 mA. It supports an operating temperature range from -65°C to +175°C.

Feature Summary

• Hermetically sealed glass MELF package construction
• Internal metallurgical bond for enhanced reliability
• Qualified per MIL-PRF-19500/437 standards
• Inherently radiation hard design

Applications

• Voltage regulation in broad operating current ranges
• Spacecraft avionics data acquisition systems
• Radiation-hardened electronic circuits
• Temperature and pressure sensor interfaces

Procurement Notes

Verify the specific qualification level required for your application, as this part number corresponds to the JAN, JANTX, or JANTXV military grades under MIL-PRF-19500/437. Confirm that the DO-213AA MELF footprint matches your PCB layout guidelines. Ensure thermal derating curves are consulted if ambient temperatures exceed standard limits. Check for RoHS compliance status if environmental regulations apply to your manufacturing process.

Selection Notes

Select this component when a stable 11 V reference is needed in a compact surface mount form factor. The internal metallurgical bond provides superior mechanical stability compared to standard epoxy packages. Consider the low capacitance characteristics for applications requiring minimal signal distortion. Verify that the 0.5 W power rating accommodates the expected load currents across the full specified temperature range.

Part Context

This device belongs to the 1N5518BUR-1 through 1N5546BUR-1 series of low voltage avalanche Zener regulators. The series offers a wide selection of voltages from 3.3 V to 33 V with various tolerance options. These components are designed for high-reliability environments, including space missions such as the Europa Orbiter and Mars Sample Return programs.

Replacement Considerations

JAN1N5531C-1

FAQ

What does the 'B' suffix indicate in the part number?

The 'B' suffix denotes a voltage tolerance of plus or minus 5 percent.

How is the polarity identified on the device?

Polarity is indicated by a cathode band on the glass package; the banded end should be positive with respect to the opposite end for Zener regulation.

Is this device sensitive to electrostatic discharge?

No, the device is nonsensitive to ESD per MIL-STD-750 Method 1020.