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Microchip Technology 1N4618UR-1
- Part No.:
- 1N4618UR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4618UR-1.pdf
- Description:
- DIODE ZENER 2.7V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,593
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Product details
Overview
1N4618UR-1 from Microsemi is a 500 mW surface-mount Zener diode in DO-213AA (SOD-80) glass MELF package, rated for 2.7 V nominal Zener voltage at 250 mA test current, with ±5% tolerance, 1500 Ω maximum dynamic impedance, and 0.5 µA maximum reverse leakage at 1.0 V. It serves as a precision voltage reference or regulation element in low-power analog circuits, space-constrained industrial sensors, and radiation-hardened instrumentation.
For engineers reviewing the 1N4618UR-1 datasheet, 1N4618UR-1 pinout, 1N4618UR-1 application, or 1N4618UR-1 equivalent, this part delivers MIL-PRF-19500/435 qualified reliability (JAN/JANTX/JANTXV/JANS levels available), hermetically sealed glass packaging, low noise density (1 µV/√Hz), and stable temperature coefficient (–0.075 %/°C) - critical for high-stability reference design, aerospace power monitoring, and military-grade signal conditioning.
Technical Context
The 1N4618UR-1 operates in reverse breakdown mode with cathode-banded polarity, requiring the banded end to be held positive relative to the anode for Zener regulation. Its metallurgically bonded construction ensures mechanical robustness and thermal stability under thermal cycling and shock conditions.
It exhibits a linear power derating curve from 500 mW at 25 °C to zero at 175 °C on standard FR4 PCBs, with junction-to-ambient thermal resistance of 300 °C/W and junction-to-end-cap resistance of 100 °C/W. Noise density is specified at 1 µV/√Hz - consistent with sub-3 V Zener devices in this series - and capacitance remains minimal per Figure 3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.7 V at 250 mA test current - defines stable regulation point for low-voltage biasing and reference generation. |
| Power Rating | 500 mW average dissipation - supports continuous operation in compact SMT layouts without forced cooling. |
| Zener Impedance (ZZT) | 1500 Ω max - indicates moderate regulation stiffness; suitable for non-critical references where load current varies <±10 mA. |
| Reverse Leakage (IR) | 0.5 µA max at 1.0 V - ensures negligible error contribution in high-impedance feedback networks. |
| Temp. Coefficient (αVZ) | –0.075 %/°C - enables predictable drift compensation in temperature-stable reference designs across –65 to +175 °C. |
| Noise Density | 1 µV/√Hz - confirms ultra-low broadband noise ideal for precision analog front-ends and sensor excitation circuits. |
| Package | DO-213AA (SOD-80) glass MELF - hermetically sealed, RoHS-compliant (e3 suffix optional), with cathode band marking. |
Pinout & Package
DO-213AA (SOD-80) glass MELF package: cylindrical, hermetically sealed, 3.3–3.7 mm length, 1.6–1.7 mm diameter, tin-lead or matte-tin plating, cathode indicated by single dark band. Weight ≈ 0.04 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher potential during Zener operation; defines reference voltage node in shunt regulator topology. |
| Anode (unbanded end) | Reference ground / return path | Serves as current sink return; must be tied to lowest system potential in regulation circuit. |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualification | Available up to JANS level - validated for mission-critical aerospace, defense, and nuclear instrumentation applications. |
| Metallurgical bond construction | Eliminates wire-bond fatigue and interfacial delamination - enhances long-term reliability under thermal cycling and vibration. |
| Low-noise Zener operation | 1 µV/√Hz noise density - enables use in high-resolution ADC references and low-noise op-amp biasing without added filtering. |
| Hermetic glass sealing | Prevents moisture ingress and parameter drift over time - critical for >10-year field deployments in harsh environments. |
| ESD insensitivity | Non-sensitive per MIL-STD-750 Method 1020 - simplifies handling and eliminates need for ESD-protected assembly lines. |
Applications
| Industrial Sensor Signal Conditioning | Aerospace Power Monitoring |
|---|---|
|
Use Scenario: Biasing bridge amplifiers and setting gain in MEMS pressure transducers operating from –55 to +125 °C. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.7 V reference for ratiometric ADC conversion. Use Value: –0.075 %/°C tempco and 0.5 µA leakage minimize offset drift and enable <0.1% full-scale error over temperature. |
Use Scenario: Monitoring bus voltage in satellite power distribution units with radiation exposure up to 100 krad(Si). IC Role / Device Role / Timing Role: Radiation-hardened Zener reference in fault-detection comparators. Use Value: Inherent radiation hardness per MicroNote 050 and JANS qualification ensure functional integrity after total ionizing dose exposure. |
| Military Radio RF Front-End Biasing | Medical Diagnostic Equipment Calibration |
|
Use Scenario: Setting gate bias for GaAs FET LNAs in handheld tactical radios subjected to shock and humidity. IC Role / Device Role / Timing Role: Low-noise, hermetically sealed Zener regulating local LNA supply rail. Use Value: 1 µV/√Hz noise density prevents degradation of receiver NF; glass MELF withstands 50g mechanical shock. |
Use Scenario: Calibrating photodiode current-to-voltage converters in portable ultrasound imaging systems. IC Role / Device Role / Timing Role: Precision shunt reference stabilizing transimpedance amplifier offset. Use Value: 500 mW rating allows safe operation with 10 mA test current; DO-213AA footprint minimizes board area in handheld form factor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CDLL4618-1 | Commercial-grade version of same die; identical electrical specs but no MIL screening; RoHS-compliant (e3) option available. | Lacks JAN/JANTX/JANTXV/JANS qualification; not suitable for defense/aerospace programs requiring traceable mil-spec conformance. | Select CDLL4618-1 for cost-sensitive commercial medical or industrial designs where radiation hardness and extended temp range are not required. |
| 1N4618UR-1e3 | Same device with RoHS-compliant matte-tin plating; identical Zener voltage, impedance, and thermal specs; no change in reliability screening level. | Required for EU/China RoHS compliance; may exhibit slightly different solder wetting behavior vs. tin-lead finish. | Choose 1N4618UR-1e3 when environmental compliance mandates lead-free assembly, and tin-lead is prohibited in final product. |
Compared with CDLL4618-1 and 1N4618UR-1e3, the base 1N4618UR-1 offers full military screening flexibility (JAN to JANS), while CDLL4618-1 reduces cost for commercial use and 1N4618UR-1e3 adds RoHS compliance without altering regulation performance.
Availability
1N4618UR-1 is available at Aetrix Electronics and suitable for aerospace power monitoring, industrial sensor signal conditioning, and military radio RF front-end biasing requiring stable component supply, long-lifecycle support, and traceable mil-spec sourcing.
Supply support for 1N4618UR-1 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 mil-spec analog and mixed-signal components.
The 1N4618UR-1 belongs to Microsemi's legacy MIL-PRF-19500/435 qualified Zener diode family, designed specifically for voltage regulation in extreme-environment electronics where long-term stability, hermeticity, and radiation tolerance are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4618UR-1?
The 1N4618UR-1 has a nominal Zener voltage of 2.7 V with a standard tolerance of ±5%, as defined by JEDEC specification and confirmed in the Electrical Characteristics table on page 4 of T4-LDS-0245 Rev. 2. This tolerance applies under thermal equilibrium at 25 °C with 250 mA test current. No tighter tolerance (e.g., 2% or 1%) is specified for this particular part number in the documentation.
Is 1N4618UR-1 suitable for surface-mount reflow assembly?
Yes, 1N4618UR-1 is qualified for surface-mount reflow assembly with a maximum solder temperature of 260 °C for 10 seconds, per MIL-STD-750 Method 2026. Its DO-213AA glass MELF package and tin-lead or RoHS-compliant matte-tin terminations ensure reliable solderability on standard FR4 PCBs using industry-standard reflow profiles.
Does 1N4618UR-1 require external heat sinking?
No, 1N4618UR-1 does not require external heat sinking under typical operating conditions. Its 500 mW power rating is thermally managed via junction-to-ambient (300 °C/W) and junction-to-end-cap (100 °C/W) paths on standard 1 oz copper FR4. Derating begins linearly at 25 °C ambient, reaching zero dissipation at 175 °C - sufficient for most low-power reference applications.
What is the maximum reverse leakage current for 1N4618UR-1?
The maximum reverse leakage current (IR) for 1N4618UR-1 is 0.5 µA at 1.0 V reverse voltage, as specified in the Electrical Characteristics table. This value is measured at 25 °C and reflects the diode's low-leakage performance, critical for maintaining accuracy in high-impedance reference circuits and battery-powered systems.
Can 1N4618UR-1 be used in radiation-intensive environments?
Yes, 1N4618UR-1 is inherently radiation hard per Microsemi MicroNote 050 and qualified to JANS level per MIL-PRF-19500/435 - the highest military reliability grade. It is documented for use in space and nuclear applications where total ionizing dose (TID) resistance up to 100 krad(Si) is required, with no functional degradation observed in tested configurations.
1N4618UR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N4618UR-1 FAQ
1.How can I place an order for 1N4618UR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4618UR-1 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-1 reliable?
The price and inventory of 1N4618UR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4618UR-1 is usually 5 days.
3.What payment methods are accepted for 1N4618UR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4618UR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4618UR-1?
1N4618UR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4618UR-1 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-1?
For technical support, including 1N4618UR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4618UR-1 requirements.
6.How does Aetrix verify that 1N4618UR-1 is sourced from the original manufacturer or authorized distributors?
All 1N4618UR-1 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-1 meets industry standards.
7.What is the process for return or replacement of 1N4618UR-1?
All 1N4618UR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4618UR-1, 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-1 part is unused and in its original packaging.
Return procedure for 1N4618UR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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