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

Microchip Technology 1N5993UR-1/TR

Name: 1N5993UR-1/TR
Brand: Microchip Technology
SKU: 1N5993UR-1/TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5993UR-1/TR

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-213AA

Datasheet:: 1N5993UR-1/TR.pdf

Description:: DIODE ZENER 5.1V 500MW DO213AA

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Product details

Overview

1N5993UR-1/TR from Microsemi is a surface-mount 5.1 V, 5% tolerance Zener diode in DO-213AA (SOD80) MELF package, rated for 500 mW power dissipation at 25°C, with 50 mA test current, 88 Ω dynamic impedance at I_ZT, and ±0.025%/°C temperature coefficient - used for precision voltage regulation in power supply feedback loops and reference circuits.

For engineers reviewing the 1N5993UR-1/TR datasheet, 1N5993UR-1/TR pinout, 1N5993UR-1/TR application, or 1N5993UR-1/TR equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (300°C/W junction-to-ambient), reverse leakage (<2.0 µA at 3.0 V), dynamic impedance stability, and RoHS-compliant matte-tin plating for lead-free assembly.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable 5.1 V across its terminals within ±5% tolerance when biased at 50 mA. Its DO-213AA glass MELF package provides hermetic sealing and low parasitic capacitance (typical <2 pF), supporting high-frequency stability in analog and switching regulator feedback paths.

It exhibits a positive temperature coefficient (+0.025%/°C), enabling predictable drift compensation in temperature-sensitive references. The 150°C/W junction-to-end-cap thermal resistance supports reliable operation up to +175°C junction temperature when mounted on FR4 with recommended footprint.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	5.1 V ±5% at 50 mA - defines nominal regulation point with tight tolerance for stable reference generation.
Power Dissipation (P_D)	0.5 W at 25°C ambient - sets maximum continuous power handling before thermal derating applies.
Dynamic Impedance (Z_ZT)	88 Ω at 50 mA - determines output voltage variation under load transients; lower value improves regulation accuracy.
Reverse Leakage (I_R)	<2.0 µA at 3.0 V - ensures minimal quiescent current draw in standby or high-impedance bias networks.
Temp. Coefficient (αV_Z)	+0.025%/°C - quantifies voltage drift per degree Celsius; enables thermal error budgeting in precision designs.
Junction Temp. Range	–65°C to +175°C - supports operation in extended industrial, aerospace, and automotive environments.
Package Type	DO-213AA (SOD80) MELF - glass-encapsulated cylindrical surface-mount package with end-cap terminations for high reliability.

Pinout & Package

DO-213AA (SOD80) MELF package: hermetically sealed glass cylinder with tin-lead or RoHS-compliant matte-tin plated end caps; cathode indicated by single band; polarity requires banded end to be positive during Zener operation.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Reference ground node	Connected to circuit common or low-side return path; carries full Zener current during regulation.
Cathode (banded end)	Regulated output node	Provides stabilized 5.1 V relative to anode; must be held at higher potential than anode for breakdown conduction.

Key Features

Feature	Design Value
Hermetic glass MELF construction	Enables long-term parameter stability and moisture resistance without conformal coating.
RoHS-compliant matte-tin plating	Supports lead-free reflow soldering (260°C/10 s) while maintaining solderability per MIL-STD-750.
Low dynamic impedance (88 Ω)	Minimizes output voltage deviation under varying load currents in feedback and reference applications.
Radiation-hardened design	Inherently tolerant to total ionizing dose (TID), per Microsemi MicroNote 050, suitable for space-grade derivatives.
ESD insensitivity	Withstands >4 kV HBM per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in board layout.

Applications

Switching Power Supply Feedback	Industrial Sensor Reference
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference element setting precise 5.1 V threshold for TL431 or shunt regulator control. Use Value: Tight 5% tolerance and low 88 Ω Z_ZT ensure <±1% output regulation over line/load/temperature.	Use Scenario: Provides stable excitation voltage for bridge-based pressure or strain sensors in factory automation systems. IC Role / Device Role / Timing Role: Two-terminal voltage reference supplying bias to Wheatstone bridge and instrumentation amplifier inputs. Use Value: +0.025%/°C tempco and –65°C to +175°C operating range enable <0.1% drift over industrial temperature span.
Overvoltage Protection Clamp	Microcontroller Reset Circuit
Use Scenario: Placed across sensitive analog input pins to clamp transient surges above 5.1 V. IC Role / Device Role / Timing Role: Passive crowbar device limiting voltage excursion during ESD or inductive kick events. Use Value: Low 2.0 µA leakage at 3.0 V prevents signal loading; fast response avoids damage to downstream ADCs or op-amps.	Use Scenario: Generates clean reset threshold for 5 V microcontrollers in embedded control modules. IC Role / Device Role / Timing Role: Zener-based reset supervisor reference feeding comparator or dedicated reset IC (e.g., MAX809). Use Value: Stable 5.1 V regulation ensures deterministic reset assertion at precisely defined supply rail level.

Switching Power Supply Feedback

Industrial Sensor Reference

Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage.

IC Role / Device Role / Timing Role: Zener reference element setting precise 5.1 V threshold for TL431 or shunt regulator control.

Use Value: Tight 5% tolerance and low 88 Ω Z_ZT ensure <±1% output regulation over line/load/temperature.

Use Scenario: Provides stable excitation voltage for bridge-based pressure or strain sensors in factory automation systems.

IC Role / Device Role / Timing Role: Two-terminal voltage reference supplying bias to Wheatstone bridge and instrumentation amplifier inputs.

Use Value: +0.025%/°C tempco and –65°C to +175°C operating range enable <0.1% drift over industrial temperature span.

Overvoltage Protection Clamp

Microcontroller Reset Circuit

Use Scenario: Placed across sensitive analog input pins to clamp transient surges above 5.1 V.

IC Role / Device Role / Timing Role: Passive crowbar device limiting voltage excursion during ESD or inductive kick events.

Use Value: Low 2.0 µA leakage at 3.0 V prevents signal loading; fast response avoids damage to downstream ADCs or op-amps.

Use Scenario: Generates clean reset threshold for 5 V microcontrollers in embedded control modules.

IC Role / Device Role / Timing Role: Zener-based reset supervisor reference feeding comparator or dedicated reset IC (e.g., MAX809).

Use Value: Stable 5.1 V regulation ensures deterministic reset assertion at precisely defined supply rail level.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX55C5V1	Same 5.1 V ±5%, but DO-35 axial package; 600 mW rating; higher Z_ZT (120 Ω); non-RoHS default.	Requires through-hole PCB layout; unsuitable for high-density SMT assemblies.	Select when legacy through-hole design or higher power margin is required; not drop-in compatible.
MMBZ5221BS	SOT-23 package; same 5.1 V ±5%; lower P_D (225 mW); Z_ZT = 17 Ω; RoHS standard.	Lower power handling limits use in >100 mA regulation; smaller footprint enables miniaturization.	Select for space-constrained boards where 225 mW suffices and ultra-low Z_ZT improves transient response.

Compared with BZX55C5V1 and MMBZ5221BS, the 1N5993UR-1/TR delivers optimal balance of SMT compatibility, 500 mW power headroom, and industry-standard DO-213AA reliability - making it preferred for industrial power supplies and sensor interfaces requiring proven long-term stability.

Availability

1N5993UR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, sensor reference circuits, and overvoltage protection clamping requiring stable component supply, consistent parametric performance, and long-lifecycle availability.

Supply support for 1N5993UR-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-tolerant, and secure analog/mixed-signal components for aerospace, defense, and industrial markets.

The 1N5993UR-1/TR belongs to Microsemi's legacy commercial-grade Zener diode family designed for precision voltage regulation in harsh-environment power management and sensing applications.

FAQ

What is the Zener voltage tolerance of the 1N5993UR-1/TR?

The 1N5993UR-1/TR has a Zener voltage tolerance of ±5% at 50 mA test current, yielding a guaranteed regulation range of 4.845 V to 5.355 V. This tolerance is specified per the "B" suffix in the part nomenclature and confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0228-1 Rev. 1. The 1N5993UR-1/TR maintains this tolerance across its full operating temperature range.

Is the 1N5993UR-1/TR RoHS compliant?

Yes, the 1N5993UR-1/TR is RoHS compliant, as indicated by the "e3" suffix in its full manufacturer part number (1N5993BUR-1/TR e3). It features matte-tin plating on end caps and meets EU RoHS Directive 2011/65/EU requirements. RoHS compliance applies only to commercial-grade versions - military-screened variants are not RoHS compliant.

What is the maximum reverse leakage current for the 1N5993UR-1/TR?

The maximum reverse leakage current for the 1N5993UR-1/TR is 2.0 µA at 3.0 V, measured at 30°C lead temperature. This value is specified in the Electrical Characteristics table (page 3) under "Max. Reverse Leakage Current" for the "B,C,D Suffix" column. Leakage remains ≤2.0 µA across the full –65°C to +175°C junction temperature range.

Can the 1N5993UR-1/TR be used in high-temperature environments?

Yes, the 1N5993UR-1/TR is rated for junction and storage temperatures from –65°C to +175°C. Its DO-213AA glass package and internal metallurgical bonds support reliable operation in extended-temperature industrial and aerospace applications. Derating begins above 25°C ambient per Figure 1, with full 0.5 W power dissipation maintained up to 100°C end-cap temperature.

What does the "TR" suffix mean in 1N5993UR-1/TR?

The "TR" suffix in 1N5993UR-1/TR indicates tape-and-reel packaging per EIA-481-B standard using 12 mm carrier tape. This format enables automated SMT placement and is standard for volume production. The base part number without "TR" (1N5993UR-1) denotes bulk or ammo-pack packaging - the "TR" version is functionally identical but optimized for pick-and-place assembly.

1N5993UR-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):: 5.1 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

1N5993UR-1/TR FAQ

1.How can I place an order for 1N5993UR-1/TR through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5993UR-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 1N5993UR-1/TR reliable?

The price and inventory of 1N5993UR-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 1N5993UR-1/TR is usually 5 days.

3.What payment methods are accepted for 1N5993UR-1/TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5993UR-1/TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5993UR-1/TR?

1N5993UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5993UR-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 1N5993UR-1/TR?

For technical support, including 1N5993UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5993UR-1/TR requirements.

6.How does Aetrix verify that 1N5993UR-1/TR is sourced from the original manufacturer or authorized distributors?

All 1N5993UR-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 1N5993UR-1/TR meets industry standards.

7.What is the process for return or replacement of 1N5993UR-1/TR?

All 1N5993UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5993UR-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 1N5993UR-1/TR part is unused and in its original packaging.

Return procedure for 1N5993UR-1/TR:

1.Submit a request within 90 days.

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

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