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Microchip Technology 1N4118UR/TR
- Part No.:
- 1N4118UR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4118UR/TR.pdf
- Description:
- DIODE ZENER 27V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:198
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Product details
Overview
1N4118UR/TR from Microsemi is a glass-encapsulated surface-mount Zener diode in DO-213AA (SOD-80/MELF) package, rated for 0.5 W steady-state power dissipation, with nominal Zener voltage 27 V ±5%, 250 mA test current, and 150 Ω maximum Zener impedance at IZT. It operates across –65 °C to +175 °C and serves as a precision voltage reference or overvoltage clamp in power supply feedback loops.
For engineers reviewing the 1N4118UR/TR datasheet, 1N4118UR/TR pinout, 1N4118UR/TR application, or 1N4118UR/TR equivalent, key selection criteria include its 27 V regulation tolerance, low 14 mA maximum Zener current (IZM), hermetically sealed MELF construction, minimal capacitance (~14 pF), and RoHS-compliant e3 marking with TR tape-and-reel packaging.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown, where Zener conduction maintains stable output voltage under varying load or input conditions. Its 27 V nominal Zener voltage is specified at 250 mA test current (IZT) with 150 Ω dynamic impedance (ZZT) and exhibits a positive temperature coefficient of +0.085 %/°C.
The DO-213AA glass MELF package provides hermetic sealing, ESD immunity per MIL-STD-750 Method 1020, and thermal resistance of 150 °C/W junction-to-end-cap. Derating begins above 25 °C ambient or 100 °C end-cap temperature, maintaining 0.5 W rating only within those limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 27 V ±5% at 250 mA - defines regulated output voltage with standard industrial tolerance |
| Zener Test Current | 250 mA - required bias current to achieve specified VZ; impacts thermal design and heatsinking needs |
| Zener Impedance | 150 Ω max at IZT - determines regulation stiffness and output voltage variation under load changes |
| Max Zener Current | 14 mA - absolute maximum DC current before exceeding 0.5 W power limit at 25 °C ambient |
| Operating Temperature | –65 °C to +175 °C - enables use in aerospace, downhole, and high-reliability industrial environments |
| Noise Density | 1 μV/√Hz typical - low broadband noise supports stable reference applications in sensitive analog circuits |
| Reverse Leakage | 10 nA max at 21.6 V - ensures minimal quiescent current in standby or high-impedance sensing nodes |
Pinout & Package
DO-213AA (SOD-80/MELF) glass surface-mount package: hermetically sealed cylindrical body with tin-lead or matte-tin end caps; cathode indicated by single black band; polarity requires banded end to be positive during Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to circuit ground or lower-potential node; reverse-biased relative to cathode for regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Banded end; connected to regulated voltage node; carries full Zener current during operation |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Enables operation up to +175 °C and prevents moisture ingress in harsh environments |
| Low 14 pF typical capacitance | Minimizes signal coupling and phase shift in high-frequency or RF-adjacent reference paths |
| Radiation-hardened per MicroNote 050 | Supports deployment in space-grade and nuclear instrumentation systems without derating |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for external ESD protection during board assembly and handling |
| e3 RoHS-compliant plating | Meets environmental compliance requirements without sacrificing solderability or thermal performance |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converter feedback networks using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Zener diode providing precise 27 V reference to TL431 shunt regulator or optocoupler LED anode. Use Value: Maintains ±5% output regulation across line/load/temperature with minimal drift (+0.085 %/°C) and low noise (<1 μV/√Hz). | Use Scenario: Protecting microcontroller I/O pins or ADC inputs from transient overvoltage events exceeding 27 V. IC Role / Device Role / Timing Role: Two-terminal shunt clamp placed between protected node and ground, conducting only above 27 V threshold. Use Value: Fast response to transients due to low junction capacitance (14 pF) and robust 0.5 W surge capability in hermetic glass package. |
| High-Temperature Sensor Biasing | Industrial Current Loop Reference |
Use Scenario: Providing stable bias voltage to RTD or thermocouple signal conditioning circuits in engine control or downhole tools. IC Role / Device Role / Timing Role: Precision voltage reference source for excitation current generation in 4–20 mA transmitter front-ends. Use Value: Guaranteed operation from –65 °C to +175 °C eliminates need for external thermal compensation or derating. | Use Scenario: Setting loop compliance voltage in HART-enabled 4–20 mA smart transmitters requiring stable headroom above 24 V rail. IC Role / Device Role / Timing Role: Zener clamping element establishing fixed 27 V upper limit on loop supply voltage to protect downstream ICs. Use Value: Tight 5% tolerance and low tempco ensure consistent loop headroom across wide ambient ranges without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5260B-7-F (Diodes Inc.) | 27 V ±5%, SOT-23 package, 225 mW rating, 300 Ω ZZT, 100 °C max TA | Lower power rating and plastic package limit use in >100 °C ambient or high-reliability sealed systems | Select when cost-sensitive, board-space-constrained designs accept reduced thermal/radiation performance |
| BZX84-C27 (ON Semiconductor) | 27 V ±5%, SOT-23, 300 mW, 350 Ω ZZT, –65 °C to +150 °C, no radiation hardening | Limited high-temp capability and unqualified for radiation environments vs. 1N4118UR/TR's +175 °C and MicroNote 050 compliance | Choose for commercial-grade consumer or computing applications where hermeticity and extreme temp range are unnecessary |
Compared with MMBZ5260B-7-F and BZX84-C27, the 1N4118UR/TR delivers superior thermal endurance (+175 °C), hermetic reliability, and radiation hardness-critical for aerospace, oilfield, and military systems-while maintaining identical 27 V regulation and 5% tolerance.
Availability
1N4118UR/TR is available at Aetrix Electronics and suitable for high-reliability power supply feedback, overvoltage protection, high-temperature sensor biasing, and industrial current loop reference applications requiring stable component supply across extended temperature and lifecycle demands.
Supply support for 1N4118UR/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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and high-temperature analog and mixed-signal components.
The 1N4118UR/TR belongs to Microsemi's legacy DO-213AA glass Zener series, engineered for mission-critical applications demanding hermetic sealing, extended temperature operation, and proven radiation tolerance.
FAQ
What is the Zener voltage tolerance for 1N4118UR/TR?
The 1N4118UR/TR has a nominal Zener voltage of 27 V with a standard tolerance of ±5%, as defined by JEDEC registration and confirmed in Microsemi's official datasheet revision D. No suffix (e.g., "C" or "D") is present in the part number, indicating the base 5% tolerance grade applies. This tolerance is measured at 250 mA test current and 25 °C ambient.
Does 1N4118UR/TR have a specified maximum Zener current (IZM)?
Yes, the 1N4118UR/TR has a maximum Zener current of 14 mA at 25 °C ambient temperature, derived from its 0.5 W power rating and 27 V nominal Zener voltage (IZM = PD/VZ ≈ 0.5 W / 27 V ≈ 18.5 mA, derated to 14 mA per datasheet Table on Page 2). This value assumes proper thermal mounting on FR4 with 1 oz copper.
Is 1N4118UR/TR RoHS compliant?
Yes, the "e3" suffix in 1N4118UR/TR confirms RoHS compliance per EU Directive 2011/65/EU. The device uses annealed matte-tin plating on end caps, solderable per MIL-STD-750 Method 2026, and replaces traditional tin-lead finishes while maintaining identical electrical and thermal performance.
What is the temperature coefficient of 1N4118UR/TR?
The 1N4118UR/TR exhibits a positive temperature coefficient of +0.085 %/°C for its Zener voltage, as specified in the Electrical Characteristics table on Page 2 of the Microsemi datasheet. This value reflects the average drift rate over the –65 °C to +175 °C operating range and supports predictable voltage behavior in high-temperature designs.
What package type does 1N4118UR/TR use?
The 1N4118UR/TR uses the DO-213AA package, also known as SOD-80 or MELF (Metal Electrode Leadless Face), a hermetically sealed glass cylindrical surface-mount package. Dimensions are 1.60–1.70 mm diameter (A) and 3.30–3.70 mm length (B), with cathode identified by a single black band.
1N4118UR/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):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 20.45 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N4118UR/TR FAQ
1.How can I place an order for 1N4118UR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4118UR/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 1N4118UR/TR reliable?
The price and inventory of 1N4118UR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4118UR/TR is usually 5 days.
3.What payment methods are accepted for 1N4118UR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4118UR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4118UR/TR?
1N4118UR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4118UR/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 1N4118UR/TR?
For technical support, including 1N4118UR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4118UR/TR requirements.
6.How does Aetrix verify that 1N4118UR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4118UR/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 1N4118UR/TR meets industry standards.
7.What is the process for return or replacement of 1N4118UR/TR?
All 1N4118UR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4118UR/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 1N4118UR/TR part is unused and in its original packaging.
Return procedure for 1N4118UR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4118UR/TR Tags
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