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Microchip Technology 1N4618UR/TR
- Part No.:
- 1N4618UR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4618UR/TR.pdf
- Description:
- DIODE ZENER 2.7V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:267
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Product details
Overview
1N4618UR/TR from Microsemi is a glass-encapsulated, surface-mount Zener diode in DO-213AA (SOD-80/MLL34) MELF package, rated for 0.5 W steady-state power dissipation at TEC < 100°C, with nominal Zener voltage 2.7 V ±5%, Zener test current 250 mA, and maximum Zener impedance 1500 Ω at IZT. It regulates voltage in low-power reference and protection circuits across industrial temperature range.
For engineers reviewing the 1N4618UR/TR datasheet, 1N4618UR/TR pinout, 1N4618UR/TR application, or 1N4618UR/TR equivalent, this part serves as a RoHS-compliant, hermetically sealed, ESD-insensitive voltage reference with minimal capacitance (typ. <1 pF), tight thermal stability (αVZ = −0.075 %/°C), and compatibility with standard SMT reflow profiles (260°C/10 s).
Technical Context
This device operates as a reverse-biased silicon Zener diode, maintaining stable 2.7 V regulation over IZ = 1–90 mA and TA = −65°C to +175°C. Its DO-213AA glass package provides hermetic sealing and metallurgical bond integrity, enabling radiation-hardened operation per MicroNote 050.
Electrical behavior is defined by fixed Zener test current (IZT = 250 mA), low noise density (1 μV/√Hz), and low reverse leakage (IR ≤ 0.5 μA at VR = 1.0 V). Thermal resistance is 150°C/W junction-to-end-cap and 300°C/W junction-to-ambient on FR4 with 1 oz Cu.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 2.7 V ±5% - stable regulation point for low-voltage biasing and clamping |
| Zener Test Current | 250 mA - standardized operating point for impedance and voltage measurement |
| Max Zener Impedance | 1500 Ω at IZT - ensures predictable dynamic response under load transients |
| Max Reverse Current | 0.5 μA at VR = 1.0 V - guarantees low leakage in high-impedance reference paths |
| Power Dissipation | 0.5 W at TEC < 100°C - defines thermal design margin for PCB layout and heatsinking |
| Operating Temperature | −65°C to +175°C - supports aerospace, downhole, and military-grade environments |
| Noise Density | 1 μV/√Hz - enables use in precision analog references without added filtering |
Pinout & Package
DO-213AA (SOD-80/MLL34) MELF glass package: hermetically sealed, axial-symmetric cylindrical body with tin-lead or matte-tin end caps; cathode indicated by single band; polarity: banded end positive during Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection in reverse-bias configuration | Must be held at higher potential than anode to enable regulation; marks polarity for correct PCB orientation |
| Anode (unbanded end) | Zener cathode connection in reverse-bias configuration | Reference ground or lower-potential node; forms regulated output at cathode when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass seal | Prevents moisture ingress and long-term parameter drift in harsh environments |
| ESD insensitivity | Complies with MIL-STD-750 Method 1020 - no handling precautions required |
| Minimal capacitance | Typical <1 pF - preserves high-frequency signal integrity in RF and fast-switching circuits |
| Radiation hardness | Inherently hardened per MicroNote 050 - suitable for space and nuclear applications |
| Tape-and-reel packaging | TR suffix indicates EIA-481-1-A compliant 12 mm tape, 2000 pcs/reel - optimized for automated SMT placement |
Applications
| Low-Voltage Reference Source | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Providing stable 2.7 V bias for op-amp input stages or ADC reference buffers in battery-powered instrumentation. IC Role / Device Role / Timing Role: Precision voltage reference element establishing DC operating point. Use Value: Maintains regulation accuracy within ±5% over −65°C to +175°C, minimizing calibration drift in field-deployed sensors. |
Use Scenario: Clamping transient spikes on 3.3 V logic supply rails in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground during ESD or surge events. Use Value: Responds within nanoseconds with low dynamic impedance (1500 Ω), limiting peak voltage to ≤2.9 V at 100 mA surge. |
| Temperature-Stable Bias Network | Radiation-Hardened Power Monitor |
Use Scenario: Generating temperature-compensated bias currents for RF front-end amplifiers in satellite transceivers. IC Role / Device Role / Timing Role: Zener-based current source component with known αVZ = −0.075 %/°C. Use Value: Enables predictable thermal tracking against silicon transistor VBE, reducing gain drift over orbital temperature cycles. |
Use Scenario: Monitoring regulated rail integrity in nuclear reactor control electronics exposed to ionizing radiation. IC Role / Device Role / Timing Role: Radiation-immune voltage reference verifying supply health in safety-critical systems. Use Value: Inherent radiation hardness eliminates need for shielding or derating, supporting continuous operation at >100 krad(Si). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4618UR (no TR) | Same electrical specs and DO-213AA package; differs only in packaging - bulk vs. tape-and-reel | Not suitable for automated SMT assembly; requires manual or vibratory bowl feeding | Select 1N4618UR/TR when using pick-and-place equipment; choose 1N4618UR for prototyping or low-volume hand soldering |
| BZX55C2V7 (ON Semiconductor) | Plastic DO-35 package; 5% tolerance; 0.5 W rating; higher ZZT (2000 Ω); αVZ = −0.07 %/°C | Limited to commercial temp range (−65°C to +175°C not guaranteed); not radiation-hardened | Choose BZX55C2V7 only for cost-sensitive, non-military, non-radiation environments where hermeticity is not required |
Compared with 1N4618UR/TR, the bulk 1N4618UR lacks SMT-ready packaging but shares identical regulation performance, while BZX55C2V7 trades hermeticity, radiation hardness, and ESD immunity for lower cost and wider commercial availability - making it unsuitable for aerospace, downhole, or safety-critical designs.
Availability
1N4618UR/TR is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage clamp protection, and radiation-hardened power monitoring requiring stable component supply across extended temperature ranges and high-reliability production programs.
Supply support for 1N4618UR/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-voltage analog components for aerospace, defense, and industrial markets.
The 1N4614UR–1N4627UR series was designed specifically for mission-critical Zener regulation in extreme environments - emphasizing hermetic sealing, wide temperature operation, and inherent radiation tolerance over cost or consumer-grade integration.
FAQ
What is the Zener voltage tolerance for 1N4618UR/TR?
The 1N4618UR/TR has a nominal Zener voltage of 2.7 V with a standard tolerance of ±5%, as specified in the Microsemi datasheet. No suffix (e.g., "C" or "D") is present in the part number, confirming the 5% tolerance grade. This tolerance applies under thermal equilibrium conditions at 25°C with IZT = 250 mA.
Is 1N4618UR/TR compatible with lead-free reflow soldering?
Yes, 1N4618UR/TR supports lead-free reflow processing with a maximum solder temperature of 260°C for 10 seconds, per MIL-STD-750 Method 2026. The end caps are available in RoHS-compliant annealed matte-tin plating, ensuring reliable wetting and intermetallic formation during Pb-free assembly.
Does 1N4618UR/TR have a specified forward voltage?
Yes, the forward voltage of 1N4618UR/TR is specified as 1.1 V at 200 mA forward current. This value is consistent across the 1N4614UR–1N4627UR family and reflects the silicon PN junction's conduction behavior when used in forward-bias applications such as polarity protection or LED driving.
What is the thermal resistance of 1N4618UR/TR?
The thermal resistance of 1N4618UR/TR is 150°C/W junction-to-end-cap and 300°C/W junction-to-ambient when mounted on an FR4 PCB with 1 oz copper and the recommended footprint. These values define the thermal path efficiency and must be used in power derating calculations per Figure 2 of the Microsemi datasheet.
Can 1N4618UR/TR be used in radiation-intensive environments?
Yes, 1N4618UR/TR is inherently radiation-hardened as documented in Microsemi MicroNote 050. Its glass-encapsulated DO-213AA construction and silicon process yield tolerance to total ionizing dose (TID) exceeding 100 krad(Si), making it suitable for satellite, nuclear, and high-altitude avionics applications.
1N4618UR/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):
- 2.7 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1500 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 1 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
1N4618UR/TR FAQ
1.How can I place an order for 1N4618UR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4618UR/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 1N4618UR/TR reliable?
The price and inventory of 1N4618UR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4618UR/TR is usually 5 days.
3.What payment methods are accepted for 1N4618UR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4618UR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4618UR/TR?
1N4618UR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4618UR/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 1N4618UR/TR?
For technical support, including 1N4618UR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4618UR/TR requirements.
6.How does Aetrix verify that 1N4618UR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4618UR/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 1N4618UR/TR meets industry standards.
7.What is the process for return or replacement of 1N4618UR/TR?
All 1N4618UR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4618UR/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 1N4618UR/TR part is unused and in its original packaging.
Return procedure for 1N4618UR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4618UR/TR Tags
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