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Microchip Technology 1N4118
- Part No.:
- 1N4118
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
1N4118.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:3,860
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Product details
Overview
1N4118 from Microsemi is a 500 mW, 27.0 V ±5% metallurgically bonded glass Zener diode in DO-35 (DO-204AH) package, qualified to JANTXV level per MIL-PRF-19500/435, with dynamic impedance of 150 Ω at 250 mA and max noise density of 1 µV/√Hz - used for precision voltage regulation in aerospace power conditioning circuits.
For engineers reviewing the 1N4118 datasheet, 1N4118 pinout, 1N4118 application, or 1N4118 equivalent, this page delivers verified Zener voltage, temperature coefficient, reverse leakage, power derating behavior, and military-grade qualification status - critical for high-reliability analog reference and overvoltage clamp design.
Technical Context
This device operates as a two-terminal voltage reference in reverse-biased breakdown mode, with a nominal Zener voltage of 27.0 V at 250 mA test current and a positive temperature coefficient of +0.090 %/°C. Its metallurgical bond construction ensures stable regulation across -65 °C to +175 °C junction temperature range.
It exhibits low dynamic impedance (150 Ω) and minimal reverse leakage (≤0.01 µA at 20.5 V), enabling tight regulation under varying load and thermal conditions. Noise density is specified at 1 µV/√Hz - confirmed for 27 V devices per Figure 3 and Table on Page 3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 27.0 V ±5% at IZT = 250 mA - defines stable regulation point for reference and clamp circuits |
| Power Dissipation | 500 mW at TL = 25 °C, linearly derated to zero at 175 °C - sets maximum continuous thermal load |
| Dynamic Impedance ZZT | 150 Ω at 250 mA - determines output voltage variation under load current changes |
| Reverse Leakage IR | ≤0.01 µA at VR = 20.5 V - ensures minimal standby current in high-impedance bias networks |
| Temp. Coefficient αVZ | +0.090 %/°C - quantifies voltage drift with ambient temperature shifts |
| Noise Density ND | 1 µV/√Hz - enables low-noise analog references in precision instrumentation |
| Junction Temp. Range | -65 °C to +175 °C - supports operation in extended industrial and aerospace environments |
Pinout & Package
DO-35 (DO-204AH) axial-leaded hermetically sealed glass package with cathode band marking; leads are tin-lead or RoHS-compliant matte-tin plated, 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 during Zener regulation |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; connected to regulated voltage rail - polarity must be observed to avoid forward conduction |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Ensures long-term parameter stability and resistance to thermal cycling degradation |
| MIL-PRF-19500/435 qualification | Validated reliability up to JANTXV level for mission-critical aerospace and defense systems |
| Low noise density | 1 µV/√Hz enables use in low-noise analog references without external filtering |
| Hermetic glass sealing | Prevents moisture ingress and parameter drift in high-humidity or vacuum environments |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling |
Applications
| Aerospace Power Conditioning | High-Reliability Reference Supply |
|---|---|
Use Scenario: Regulating auxiliary 27 V bus in satellite power distribution units exposed to radiation and thermal cycling. IC Role / Device Role / Timing Role: Zener diode providing stable 27 V reference for DC-DC converter feedback and overvoltage protection. Use Value: JANTXV qualification and radiation hardness ensure uninterrupted operation in LEO orbit environments. | Use Scenario: Generating precise 27 V reference for analog-to-digital converter (ADC) biasing in avionics flight control computers. IC Role / Device Role / Timing Role: Two-terminal voltage reference establishing accurate input scaling for 16-bit ADC front-end. Use Value: Low 1 µV/√Hz noise and +0.090 %/°C tempco minimize measurement error across -55 °C to +125 °C operating range. |
| Defense System Overvoltage Clamp | Industrial Sensor Excitation |
Use Scenario: Clamping transient surges on 24 V vehicle power lines in armored ground vehicles subjected to EMP events. IC Role / Device Role / Timing Role: Fast-acting shunt regulator absorbing energy above 27 V threshold during voltage spikes. Use Value: Hermetic DO-35 package and 500 mW rating sustain repeated surge events without parameter shift. | Use Scenario: Exciting 2-wire 4–20 mA pressure transmitters requiring stable 27 V excitation in oil & gas process control cabinets. IC Role / Device Role / Timing Role: Zener-based constant-voltage source powering loop-powered sensor electronics. Use Value: 150 Ω dynamic impedance maintains <±0.1% regulation despite 10–20 mA load variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4750A | 27 V ±5%, 1 W rating, DO-41 package, +0.085 %/°C tempco, 200 Ω ZZT | Higher power but larger footprint; not mil-qualified | Select when higher power margin is needed and JANTXV qualification is unnecessary |
| CMZ27 | 27 V ±5%, 500 mW, SOD-123 surface-mount, +0.09 %/°C, 150 Ω ZZT, AEC-Q200 qualified | Surface-mount only; automotive-qualified but not mil-qualified | Select for space-constrained PCBs where reflow compatibility and automotive reliability are prioritized |
Compared with 1N4118, 1N4750A offers double power dissipation but lacks military qualification and has higher dynamic impedance; CMZ27 matches key electrical specs and footprint efficiency but trades hermetic glass reliability for automotive-grade plastic packaging.
Availability
1N4118 is available at Aetrix Electronics and suitable for aerospace power conditioning, high-reliability reference supply, and defense system overvoltage clamp applications requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 1N4118 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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N4118 belongs to Microsemi's legacy MIL-PRF-19500/435-qualified Zener diode family, engineered specifically for voltage regulation in harsh-environment systems where parameter stability, radiation tolerance, and long-term reliability are non-negotiable.
FAQ
What is the Zener voltage tolerance of the 1N4118?
The 1N4118 has a nominal Zener voltage of 27.0 V with a standard tolerance of ±5%, as defined by JEDEC registration and confirmed in the Electrical Characteristics table on Page 3 of the T4-LDS-0245-2 datasheet. This tolerance applies at 250 mA test current and 25 °C ambient temperature.
Is the 1N4118 qualified to JANS or JANTXV level?
Yes, the 1N4118 is qualified to JANTXV level per MIL-PRF-19500/435, as stated in the DESCRIPTION section on Page 1. JANTXV qualification confirms enhanced screening, burn-in, and environmental testing beyond commercial-grade parts - critical for mission-critical aerospace deployments of the 1N4118.
What is the maximum reverse leakage current for the 1N4118?
The 1N4118 has a maximum reverse leakage current (IR) of 0.01 µA at VR = 20.5 V, per the Electrical Characteristics table on Page 3. This ultra-low leakage supports high-impedance bias networks and minimizes standby power loss in precision analog circuits using the 1N4118.
Does the 1N4118 have a positive or negative temperature coefficient?
The 1N4118 has a positive temperature coefficient of +0.090 %/°C, as specified in the Electrical Characteristics table. This means its Zener voltage increases slightly with rising temperature - a key factor when designing thermally stable references using the 1N4118 in wide-temperature-range applications.
What package type is used for the 1N4118?
The 1N4118 uses the DO-35 (DO-204AH) axial-leaded, hermetically sealed glass package, as confirmed in the MECHANICAL and PACKAGING section on Page 2. The cathode is marked by a band, and leads are tin-lead or RoHS-compliant matte-tin plated - consistent across all 1N4118 variants.
1N4118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- 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:
- -
1N4118 FAQ
1.How can I place an order for 1N4118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4118 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 1N4118 reliable?
The price and inventory of 1N4118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4118 is usually 5 days.
3.What payment methods are accepted for 1N4118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4118?
1N4118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4118 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 1N4118?
For technical support, including 1N4118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4118 requirements.
6.How does Aetrix verify that 1N4118 is sourced from the original manufacturer or authorized distributors?
All 1N4118 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 1N4118 meets industry standards.
7.What is the process for return or replacement of 1N4118?
All 1N4118 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4118, 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 1N4118 part is unused and in its original packaging.
Return procedure for 1N4118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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