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Microchip Technology 1N5918UR-1/TR
- Part No.:
- 1N5918UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
1N5918UR-1/TR.pdf
- Description:
- VOLTAGE REGULATOR
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Product details
Overview
1N5918UR-1/TR from Microsemi is a 1.5 W surface-mount Zener diode in DO-213AB (MELF) glass package, rated for 5.1 V ±5% Zener voltage at 73.5 mA test current, with 4.0 Ω dynamic impedance and 5.0 µA reverse leakage at 5.0 V. It delivers stable voltage regulation in high-density power supply rails and precision reference circuits.
For engineers reviewing the 1N5918UR-1/TR datasheet, 1N5918UR-1/TR pinout, 1N5918UR-1/TR application, or 1N5918UR-1/TR equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (RθJA = 120 °C/W), hermetic glass packaging, MIL-PRF-19500 screening availability, and RoHS-compliant plating.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain a stable 5.1 V across its terminals over a wide current range (IZK = 1.0 mA to IZM = 294 mA). Its metallurgically bonded tungsten slugs and voidless hard-glass enclosure ensure low thermal resistance (RθJEC = 40 °C/W) and high reliability under thermal cycling.
The 1N5918UR-1/TR exhibits specified capacitance per Figure 2 of the datasheet, non-sensitive ESD behavior per MIL-STD-750 Method 1020, and inherent radiation hardness documented in Microsemi MicroNote 050 - making it suitable for aerospace and industrial environments where long-term parametric stability is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V ±5% at IZT = 73.5 mA - defines nominal regulation point with tight tolerance for precision references. |
| Power Dissipation (PD) | 1.5 W @ TEC ≤ 115 °C - supports continuous operation in compact layouts with controlled end-cap temperature. |
| Dynamic Impedance (ZZT) | 4.0 Ω - ensures minimal output voltage variation under load current changes in feedback or clamp circuits. |
| Reverse Leakage (IR) | 5.0 µA max at VR = 5.0 V - guarantees low quiescent current in standby or battery-backed systems. |
| Junction Temp Range | –65 °C to +175 °C - enables deployment in extended-temperature industrial and automotive under-hood applications. |
| Thermal Resistance (RθJA) | 120 °C/W on FR4 (1 oz Cu) - informs heatsinking requirements and derating for PCB-level thermal design. |
Pinout & Package
DO-213AB (MELF) glass package: hermetically sealed cylindrical body with metallurgically bonded tungsten slugs and cathode band marking; terminals are tin/lead or RoHS-compliant matte tin over copper, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse-biased operation requires cathode at higher potential. |
| Cathode | Zener regulation terminal / voltage reference output | Marked by black band; supplies regulated 5.1 V when reverse-biased; must be held positive relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and intermetallic degradation, enabling >20-year parametric stability in harsh environments. |
| Metallurgically enhanced internal contacts | Reduces thermal resistance (RθJEC = 40 °C/W) and improves power handling vs. standard epoxy-packaged Zeners. |
| MIL-PRF-19500 screening option | Supports high-reliability qualification for defense/aerospace programs requiring lot traceability and burn-in. |
| RoHS-compliant plating | Matte tin termination meets lead-free assembly requirements without compromising solder wetting or intermetallic formation. |
| Low ESD sensitivity | Qualified per MIL-STD-750 Method 1020 - no special handling required during SMT placement or board handling. |
Applications
| Industrial Power Supply Regulation | Automotive ECU Reference Voltage |
|---|---|
Use Scenario: Stabilizing 5 V rail in isolated DC-DC converter feedback loop for PLC I/O modules. IC Role / Device Role / Timing Role: Zener diode providing precise 5.1 V reference for optocoupler biasing and error amplifier input. Use Value: Tight 5% voltage tolerance and low 4.0 Ω dynamic impedance minimize output ripple and improve load regulation accuracy. |
Use Scenario: Generating stable reference for analog sensor signal conditioning in engine control units. IC Role / Device Role / Timing Role: Two-terminal voltage reference supplying bias to pressure and temperature transducer interfaces. Use Value: –65 °C to +175 °C operating range and hermetic sealing ensure reliability across under-hood thermal cycles. |
| Aerospace Avionics Clamp Circuit | Medical Instrumentation Voltage Clamp |
Use Scenario: Overvoltage protection for 5 V logic inputs in flight data recorder interface boards. IC Role / Device Role / Timing Role: Transient voltage clamp limiting input excursions to safe levels during ESD or surge events. Use Value: Radiation-hardened structure and MIL-PRF-19500 screening support DO-160 compliance and mission-critical uptime. |
Use Scenario: Protecting ADC front-end inputs in portable ultrasound devices against accidental probe contact voltage spikes. IC Role / Device Role / Timing Role: Low-leakage (5.0 µA) Zener clamp preserving signal integrity in high-impedance analog paths. Use Value: Minimal reverse current prevents loading of sensitive sensor outputs while maintaining fast response to overvoltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5918B-TR | Same 5.1 V rating and DO-213AB package, but non-RoHS (tin/lead plating) and no "UR" reliability level designation. | Lacks MIL-PRF-19500 screening eligibility and RoHS compliance - unsuitable for new medical or export-controlled designs. | Select only for legacy repair or cost-sensitive commercial applications where leaded solder and no screening are acceptable. |
| SMBG5918B | Same electrical specs but in SMB (DO-214AA) plastic package; RθJA = 100 °C/W; not hermetically sealed. | Higher moisture susceptibility and lower thermal robustness - limited to benign indoor environments. | Choose for high-volume consumer electronics where cost and PCB area outweigh long-term reliability needs. |
Compared with 1N5918UR-1/TR, the 1N5918B-TR sacrifices RoHS compliance and screening capability for lower cost, while SMBG5918B trades hermeticity and thermal performance for smaller footprint and higher manufacturability - making the 1N5918UR-1/TR optimal for high-reliability, thermally demanding, or regulated markets.
Availability
1N5918UR-1/TR is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU reference voltage generation, aerospace avionics clamp circuits, and medical instrumentation voltage clamping requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N5918UR-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 analog, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N5918UR-1/TR belongs to Microsemi's legacy 1N59xxBUR-1 series of metallurgically bonded glass Zener diodes, engineered specifically for applications demanding hermetic sealing, radiation tolerance, and MIL-PRF-19500 qualification capability.
FAQ
What is the Zener voltage tolerance for the 1N5918UR-1/TR?
The 1N5918UR-1/TR has a Zener voltage tolerance of ±5%, specified as 5.1 V at 73.5 mA test current (IZT). This tolerance is confirmed in the Electrical Characteristics table on page 3 of Microsemi's T4-LDS-0300-1 datasheet and applies to all units meeting the "B" tolerance grade indicated in the part nomenclature.
Is the 1N5918UR-1/TR RoHS compliant?
Yes, the 1N5918UR-1/TR is RoHS compliant, as indicated by the "e3" suffix in alternate nomenclature (e.g., 1N5918BUR-1(e3)) and explicitly stated in the FEATURES section of the datasheet. Its terminations use matte tin plating over copper, qualified per MIL-STD-750 Method 2026.
What package type does the 1N5918UR-1/TR use?
The 1N5918UR-1/TR uses the DO-213AB package - a hermetically sealed glass MELF (Metal Electrode Leadless Face) case with metallurgically bonded tungsten slugs. Dimensions are provided on page 5 of the datasheet, with BD = 2.39–2.67 mm and BL = 4.80–5.21 mm.
Does the 1N5918UR-1/TR support MIL-PRF-19500 screening?
Yes, MIL-PRF-19500 screening is available for the 1N5918UR-1/TR per the FEATURES section of the datasheet. Screening options depend on reliability level designation (e.g., "UR") and require consultation with Microsemi/Microchip for specific test plans and documentation.
What is the maximum reverse leakage current for the 1N5918UR-1/TR?
The maximum reverse leakage current (IR) for the 1N5918UR-1/TR is 5.0 µA at VR = 5.0 V, as specified in the Electrical Characteristics table on page 3 of the datasheet. This value is measured at TEC = 25 °C and confirms low standby power consumption in clamp or reference roles.
1N5918UR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
1N5918UR-1/TR FAQ
1.How can I place an order for 1N5918UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5918UR-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 1N5918UR-1/TR reliable?
The price and inventory of 1N5918UR-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 1N5918UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5918UR-1/TR?
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4.How is shipping managed for 1N5918UR-1/TR?
1N5918UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5918UR-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 1N5918UR-1/TR?
For technical support, including 1N5918UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5918UR-1/TR requirements.
6.How does Aetrix verify that 1N5918UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5918UR-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 1N5918UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5918UR-1/TR?
All 1N5918UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5918UR-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 1N5918UR-1/TR part is unused and in its original packaging.
Return procedure for 1N5918UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5918UR-1/TR Tags
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