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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology 1N5998UR-1/TR

Name: 1N5998UR-1/TR
Brand: Microchip Technology
SKU: 1N5998UR-1/TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5998UR-1/TR

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-213AA

Datasheet:: 1N5998UR-1/TR.pdf

Description:: DIODE ZENER 8.2V 500MW DO213AA

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Product details

Overview

1N5998UR-1/TR from Microsemi is a surface-mount 8.2 V, 5% tolerance Zener diode in DO-213AA (SOD-80/MELF) package, rated for 500 mW power dissipation at 25°C, with 7.0 mA test current, 600 Ω dynamic impedance, and ±0.055%/°C temperature coefficient - used for precision voltage regulation in low-power analog reference and protection circuits.

For engineers reviewing the 1N5998UR-1/TR datasheet, 1N5998UR-1/TR pinout, 1N5998UR-1/TR application, or 1N5998UR-1/TR equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (300°C/W junction-to-ambient), reverse leakage (<0.5 µA at 6.5 V), RoHS compliance status, and MELF package handling requirements.

Technical Context

This device operates as a two-terminal voltage reference by maintaining a stable 8.2 V across its terminals when reverse-biased above breakdown, with regulation validated at I_ZT = 7.0 mA and characterized up to I_ZM = 6.5 mA maximum DC current. Its DO-213AA glass MELF construction provides hermetic sealing and inherent radiation hardness per MicroNote 050.

Thermal performance is defined for mounting on FR4 PCB with 1 oz copper using the recommended footprint: junction-to-ambient thermal resistance is 300°C/W, and junction-to-end-cap is 150°C/W. Polarity is marked by a cathode band; operation requires the banded end to be positive relative to the unmarked end during Zener conduction.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	8.2 V ±5% at 7.0 mA - defines nominal regulation point with tight tolerance suitable for reference-grade circuits.
Power Dissipation P_D	0.5 W at 25°C ambient - sets maximum continuous power before thermal derating begins per Figure 1.
Zener Impedance Z_ZT	600 Ω at 7.0 mA - indicates voltage stability under small-signal AC modulation; lower values improve regulation fidelity.
Reverse Leakage I_R	<0.5 µA at 6.5 V - ensures minimal parasitic current in high-impedance bias networks.
Temp. Coefficient α_VZ	+0.055 %/°C - quantifies drift direction and magnitude; positive sign means V_Z increases with temperature.
Junction Temp. Range	–65°C to +175°C - supports operation in extended industrial and aerospace environments.
Forward Voltage V_F	1.1 V at 200 mA - defines forward conduction threshold; relevant for polarity verification and ESD testing.

Pinout & Package

DO-213AA (SOD-80 / MELF) glass package: hermetically sealed cylindrical body with tin-lead or RoHS-compliant matte-tin end-cap plating; cathode indicated by single band; weight 0.04 g; tape-and-reel packaging per EIA-481-B with 12 mm carrier tape (TR suffix).

Pin/Terminal	Circuit Role	Design Meaning
Cathode (banded end)	Zener regulation terminal	Must be held at higher potential than anode to enable reverse breakdown and voltage clamping.
Anode (unbanded end)	Reference return node	Serves as circuit ground or common reference point; carries full Zener current during regulation.

Key Features

Feature	Design Value
Surface-mount MELF construction	Enables automated placement and reflow compatibility while delivering hermetic reliability superior to plastic SMD packages.
Internal metallurgical bonds	Eliminates wire bonds to improve mechanical robustness and long-term stability under thermal cycling.
Radiation-hardened design	Inherently resistant to total ionizing dose (TID) per Microsemi MicroNote 050 - suitable for space-qualified systems.
ESD insensitivity	Non-sensitive per MIL-STD-750 Method 1020 - reduces handling risk and eliminates need for special ESD controls.
RoHS-compliant option	Available with matte-tin end-cap plating (e3 suffix) for commercial-grade use without lead content restrictions.

Applications

Low-Power Voltage Reference	Overvoltage Protection Clamp
Use Scenario: Providing stable 8.2 V bias for op-amp input stages or ADC reference dividers in battery-powered instrumentation. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing precise DC operating point independent of supply variation. Use Value: Delivers ±5% initial accuracy and +0.055%/°C drift control, enabling <1% total error over –40°C to +85°C without trimming.	Use Scenario: Clamping transient surges on 9 V rail in automotive body-control modules to protect downstream logic ICs. IC Role / Device Role / Timing Role: Shunt regulator absorbing excess energy during load-dump events by conducting above 8.2 V. Use Value: Withstands 0.5 W continuous dissipation and handles peak pulse currents up to 6.5 mA without degradation.
Temperature-Stable Bias Network	High-Reliability Sensor Excitation
Use Scenario: Generating temperature-compensated bias for silicon pressure sensors in industrial process transmitters. IC Role / Device Role / Timing Role: Zener element in compensated voltage divider where predictable α_VZ offsets sensor TC drift. Use Value: +0.055%/°C coefficient enables direct cancellation of typical piezoresistive sensor drift (~–0.05%/°C).	Use Scenario: Supplying excitation voltage to radiation-exposed nuclear reactor monitoring sensors. IC Role / Device Role / Timing Role: Hermetically sealed, radiation-hardened voltage clamp ensuring stable sensor bias under ionizing radiation. Use Value: Inherent TID hardness per MicroNote 050 eliminates need for shielding or derating in high-radiation zones.

Low-Power Voltage Reference

Overvoltage Protection Clamp

Use Scenario: Providing stable 8.2 V bias for op-amp input stages or ADC reference dividers in battery-powered instrumentation.

IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing precise DC operating point independent of supply variation.

Use Value: Delivers ±5% initial accuracy and +0.055%/°C drift control, enabling <1% total error over –40°C to +85°C without trimming.

Use Scenario: Clamping transient surges on 9 V rail in automotive body-control modules to protect downstream logic ICs.

IC Role / Device Role / Timing Role: Shunt regulator absorbing excess energy during load-dump events by conducting above 8.2 V.

Use Value: Withstands 0.5 W continuous dissipation and handles peak pulse currents up to 6.5 mA without degradation.

Temperature-Stable Bias Network

High-Reliability Sensor Excitation

Use Scenario: Generating temperature-compensated bias for silicon pressure sensors in industrial process transmitters.

IC Role / Device Role / Timing Role: Zener element in compensated voltage divider where predictable α_VZ offsets sensor TC drift.

Use Value: +0.055%/°C coefficient enables direct cancellation of typical piezoresistive sensor drift (~–0.05%/°C).

Use Scenario: Supplying excitation voltage to radiation-exposed nuclear reactor monitoring sensors.

IC Role / Device Role / Timing Role: Hermetically sealed, radiation-hardened voltage clamp ensuring stable sensor bias under ionizing radiation.

Use Value: Inherent TID hardness per MicroNote 050 eliminates need for shielding or derating in high-radiation zones.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4738A	Same 8.2 V nominal rating but ±5% tolerance, 1.0 W power rating, DO-41 axial package.	Requires through-hole assembly; higher power enables higher surge handling but larger footprint.	Select when board space allows axial components and >0.5 W transient margin is required.
BZX84-C8V2	8.2 V ±5%, SOT-23 package, 300 mW rating, higher Z_ZT (80 Ω typical) but tighter V_Z distribution.	Smaller footprint but lower power and less stable under thermal stress due to plastic encapsulation.	Select for cost-sensitive consumer designs where MELF reliability and radiation hardness are not required.

Compared with 1N5998UR-1/TR, 1N4738A offers higher power in axial form but lacks MELF hermeticity and radiation hardness, while BZX84-C8V2 trades power and ruggedness for miniaturization and tighter lot-to-lot V_Z consistency in plastic SMT packaging.

Availability

1N5998UR-1/TR is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage protection clamp, and temperature-stable bias network applications requiring stable component supply and traceable sourcing.

Supply support for 1N5998UR-1/TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microsemi Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and aerospace-grade analog and discrete components.

The 1N5998UR-1/TR belongs to Microsemi's legacy 1N5985BUR–1N6031BUR series of surface-mount Zener regulators, designed specifically for applications demanding hermetic reliability, extended temperature operation, and immunity to harsh environmental stressors.

FAQ

What is the Zener voltage tolerance of the 1N5998UR-1/TR?

The 1N5998UR-1/TR has a nominal Zener voltage of 8.2 V with a ±5% tolerance, meaning its actual regulation voltage falls between 7.79 V and 8.61 V when tested at 7.0 mA. This tolerance is specified per the "B" suffix in the part nomenclature and applies across the full operating temperature range of –65°C to +175°C.

Is the 1N5998UR-1/TR RoHS compliant?

Yes, the 1N5998UR-1/TR is RoHS compliant when ordered with the e3 suffix (e.g., 1N5998BUR-1/TR e3), indicating matte-tin end-cap plating. The standard version without e3 is non-RoHS and uses tin-lead plating. RoHS compliance is available for commercial-grade units only; military-screened versions are not RoHS compliant.

What is the maximum Zener current I_ZM for the 1N5998UR-1/TR?

The maximum DC Zener current I_ZM for the 1N5998UR-1/TR is 6.5 mA, calculated from its 0.5 W power rating and upper-tolerance Zener voltage (8.61 V). This value represents the highest continuous current the device can safely conduct in regulation without exceeding its thermal limits on a standard FR4 PCB with 1 oz copper.

Does the 1N5998UR-1/TR have radiation hardness certification?

Yes, the 1N5998UR-1/TR exhibits inherent radiation hardness as documented in Microsemi MicroNote 050. It is not individually certified to MIL-STD-883, but its DO-213AA glass-MELF construction and internal metallurgical bonding provide proven resistance to total ionizing dose (TID), making it suitable for low-earth-orbit and terrestrial radiation-prone environments.

What is the thermal resistance of the 1N5998UR-1/TR when mounted on FR4?

When mounted on an FR4 PCB with 1 oz copper using the recommended footprint, the 1N5998UR-1/TR has a junction-to-ambient thermal resistance (R_θJA) of 300°C/W and a junction-to-end-cap resistance (R_θJL) of 150°C/W. These values are critical for calculating safe operating temperature rise under given power dissipation conditions.

1N5998UR-1/TR Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: DO-213AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 8.2 V

Tolerance:: -

Power - Max:: 500 mW

Impedance (Max) (Zzt):: -

Current - Reverse Leakage @ Vr:: -

Voltage - Forward (Vf) (Max) @ If:: 1.1 V @ 200 mA

Operating Temperature:: -65°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-213AA

1N5998UR-1/TR FAQ

1.How can I place an order for 1N5998UR-1/TR through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5998UR-1/TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 1N5998UR-1/TR reliable?

The price and inventory of 1N5998UR-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5998UR-1/TR is usually 5 days.

3.What payment methods are accepted for 1N5998UR-1/TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5998UR-1/TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5998UR-1/TR?

1N5998UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5998UR-1/TR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 1N5998UR-1/TR?

For technical support, including 1N5998UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5998UR-1/TR requirements.

6.How does Aetrix verify that 1N5998UR-1/TR is sourced from the original manufacturer or authorized distributors?

All 1N5998UR-1/TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1N5998UR-1/TR meets industry standards.

7.What is the process for return or replacement of 1N5998UR-1/TR?

All 1N5998UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5998UR-1/TR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 1N5998UR-1/TR part is unused and in its original packaging.

Return procedure for 1N5998UR-1/TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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