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Microchip Technology 1N4618-1
- Part No.:
- 1N4618-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4618-1.pdf
- Description:
- DIODE ZENER 2.7V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:6,493
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Product details
Overview
1N4618-1 from Microsemi is a 500 mW, 2.7 V Zener diode in DO-35 glass package, qualified to JANTXV level per MIL-PRF-19500/435, with 5% voltage tolerance, 1500 Ω dynamic impedance at 250 mA test current, and 0.5 µA maximum reverse leakage at 2.0 V. It serves as a precision low-voltage reference in military-grade power regulation circuits.
For engineers reviewing the 1N4618-1 datasheet, 1N4618-1 pinout, 1N4618-1 application, or 1N4618-1 equivalent, this page delivers verified electrical parameters, mil-spec qualification status, thermal derating behavior, noise density (1 µV/√Hz), and direct alternative part comparisons for high-reliability analog design.
Technical Context
The 1N4618-1 operates in reverse breakdown with a nominal Zener voltage of 2.7 V at IZT = 250 mA, exhibiting a temperature coefficient of −0.075 %/°C and dynamic impedance of 1500 Ω. Its metallurgically bonded construction ensures stable regulation across −65 °C to +175 °C junction temperature range.
It delivers low-noise voltage reference performance (1 µV/√Hz) and minimal capacitance (<1 pF typical), making it suitable for low-drift analog sensing and precision biasing where ESD immunity (MIL-STD-750/1020) and radiation hardness are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 2.7 V at 250 mA - defines precise regulation point for low-voltage reference circuits |
| Power Dissipation | 500 mW at 25 °C - supports stable operation in compact through-hole layouts with linear derating to zero at 175 °C |
| Dynamic Impedance ZZT | 1500 Ω at 250 mA - indicates moderate regulation stiffness; suitable for non-critical load regulation |
| Reverse Leakage IR | 0.5 µA max at 2.0 V - ensures minimal quiescent current draw in standby bias networks |
| Noise Density | 1 µV/√Hz - enables use in low-noise analog front-ends without added filtering |
| Temp Coefficient αVZ | −0.075 %/°C - predictable negative drift allows compensation in temperature-stable references |
| Junction Temp Range | −65 °C to +175 °C - certified for extended-range aerospace and downhole industrial operation |
Pinout & Package
DO-35 (DO-204AH) axial-leaded glass package: hermetically sealed, cathode indicated by band; banded end is anode in forward bias but functions as cathode (positive terminal) during Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward conduction terminal / Zener regulation return path | Connected to circuit ground or lowest potential node when used as shunt regulator |
| Cathode (banded end) | Zener regulation output / reference voltage node | Provides stable 2.7 V relative to anode; must be biased positive w.r.t. anode for breakdown operation |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualification | JANTXV-level reliability certification ensures traceable lot control and screening for defense/aerospace programs |
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal cycling, improving long-term parameter stability |
| Low noise density (1 µV/√Hz) | Reduces need for external filtering in precision analog signal chains and sensor excitation circuits |
| ESD immunity (MIL-STD-750/1020) | Enables safe handling and assembly without special grounding protocols in production environments |
| Radiation hardness | Inherent tolerance to total ionizing dose (TID) per MicroNote 050 supports space-qualified designs |
Applications
| Avionics Power Monitoring | Military Radio Bias Networks |
|---|---|
Use Scenario: Providing stable 2.7 V reference for ADC input scaling in aircraft engine control units operating across −55 °C to +125 °C ambient. IC Role / Device Role / Timing Role: Shunt voltage reference regulating supply rail for analog-to-digital conversion circuitry. Use Value: Maintains ±1.5% reference accuracy over full temperature range due to −0.075 %/°C tempco and JANTXV screening. |
Use Scenario: Generating fixed bias voltage for RF power amplifier stages in tactical HF transceivers exposed to shock/vibration. IC Role / Device Role / Timing Role: Low-noise DC bias source ensuring consistent gain and linearity in RF front-end amplifiers. Use Value: 1 µV/√Hz noise density prevents AM sideband degradation in sensitive receive paths. |
| Satellite Sensor Conditioning | Downhole Oilfield Instrumentation |
Use Scenario: Supplying reference voltage to radiation-tolerant temperature sensors in LEO satellite payloads. IC Role / Device Role / Timing Role: Radiation-hardened Zener reference enabling calibration stability in high-TID environments. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or redundancy in compact payload designs. |
Use Scenario: Regulating bias for piezoelectric pressure transducers in geothermal drilling tools operating at 175 °C junction temperature. IC Role / Device Role / Timing Role: High-temperature-stable shunt regulator maintaining sensor excitation integrity. Use Value: Guaranteed operation up to +175 °C junction temperature with no derating loss below 150 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4618UR-1 | Same electrical specs, DO-213AA surface-mount package instead of DO-35 axial lead | Required for automated SMT assembly; lacks axial mounting flexibility and manual prototyping ease | Select when board space constraints or reflow-only manufacturing mandate SMT packaging |
| 1N4618-1e3 | Identical DO-35 package and electrical specs, RoHS-compliant matte-tin plating (vs. SnPb on standard -1) | Complies with EU RoHS Directive; not qualified to JANTXV level (commercial grade only) | Select for commercial or industrial systems requiring RoHS compliance but not mil-spec screening |
Compared with 1N4618-1, the 1N4618UR-1 enables PCB area reduction and automated placement but sacrifices hand-soldering adaptability, while the 1N4618-1e3 meets environmental compliance without mil-qualification-making the base 1N4618-1 optimal for mixed-signal avionics where both reliability and legacy process compatibility matter.
Availability
1N4618-1 is available at Aetrix Electronics and suitable for avionics power monitoring, military radio bias networks, satellite sensor conditioning, and downhole oilfield instrumentation requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4618-1 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 analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N4618-1 belongs to Microsemi's legacy MIL-PRF-19500-qualified Zener diode family, engineered specifically for precision voltage reference and regulation in mission-critical systems where parameter stability under extreme stress is non-negotiable.
FAQ
What is the Zener voltage tolerance of the 1N4618-1?
The 1N4618-1 has a nominal Zener voltage of 2.7 V with a standard tolerance of ±5%, as defined by JEDEC registration and confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2 Rev. 1. This tolerance applies under thermal equilibrium at 25 °C with IZT = 250 mA.
Is the 1N4618-1 qualified to JANS level?
No, the 1N4618-1 is qualified to JANTXV level per MIL-PRF-19500/435, as stated in the DESCRIPTION section on page 1. JANS qualification is available for other members of the same series (e.g., 1N4618-1JANS), but the standard 1N4618-1 part number denotes JANTXV screening.
What is the maximum reverse leakage current for the 1N4618-1?
The 1N4618-1 has a maximum reverse leakage current (IR) of 0.5 µA at VR = 2.0 V, as specified in the Electrical Characteristics table on page 3. This value is measured at 25 °C and reflects tight leakage control essential for low-power bias networks.
Does the 1N4618-1 have radiation hardness documentation?
Yes, the 1N4618-1 inherits inherent radiation hardness from its metallurgically bonded construction and is explicitly referenced in Microsemi MicroNote 050, cited in the APPLICATIONS / BENEFITS section on page 1. This supports use in TID-sensitive space and nuclear applications without additional hardening.
Can the 1N4618-1 be used in surface-mount designs?
The standard 1N4618-1 uses a DO-35 axial-leaded package and is not SMT-compatible. However, Microsemi offers the functionally identical 1N4618UR-1 in DO-213AA surface-mount package, which shares all electrical specifications including 2.7 V Zener voltage and 1 µV/√Hz noise density.
1N4618-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, Axial
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-7
1N4618-1 FAQ
1.How can I place an order for 1N4618-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4618-1 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 1N4618-1 reliable?
The price and inventory of 1N4618-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4618-1 is usually 5 days.
3.What payment methods are accepted for 1N4618-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4618-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4618-1?
1N4618-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4618-1 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 1N4618-1?
For technical support, including 1N4618-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4618-1 requirements.
6.How does Aetrix verify that 1N4618-1 is sourced from the original manufacturer or authorized distributors?
All 1N4618-1 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 1N4618-1 meets industry standards.
7.What is the process for return or replacement of 1N4618-1?
All 1N4618-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4618-1, 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 1N4618-1 part is unused and in its original packaging.
Return procedure for 1N4618-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4618-1 Tags
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