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Microchip Technology 1N4108-1
- Part No.:
- 1N4108-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4108-1.pdf
- Description:
- DIODE ZENER 14V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,011
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Product details
Overview
1N4108-1 from Microsemi is a 500 mW, 14.0 V Zener diode in DO-35 glass package, qualified to JANTXV level per MIL-PRF-19500/435. It delivers ±5% voltage tolerance, 200 Ω dynamic impedance at 250 mA test current, and operates across –65 °C to +175 °C junction temperature for precision voltage regulation in high-reliability analog power supplies.
For engineers reviewing the 1N4108-1 datasheet, 1N4108-1 pinout, 1N4108-1 application, or 1N4108-1 equivalent, this page provides verified Zener voltage, thermal resistance (250 °C/W junction-to-lead), noise density (1 μV/√Hz), max reverse leakage (0.05 μA @ 11.2 V), and radiation-hardened performance per MicroNote 050.
Technical Context
The 1N4108-1 functions as a two-terminal voltage reference with metallurgically bonded construction ensuring stable breakdown characteristics under thermal cycling and mechanical stress. Its 14.0 V nominal Zener voltage is specified at 250 mA test current (IZT), with dynamic impedance measured at 10% AC modulation superimposed on IZT.
Designed for operation in the sharp knee region of the reverse-bias IV curve, it exhibits low noise density (1 μV/√Hz) and minimal capacitance (≈5 pF typical), enabling use in low-noise analog references and precision biasing where stability over temperature and radiation hardness are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 14.0 V at 250 mA - defines precise regulation point for feedback loops and reference generation |
| Power Dissipation | 500 mW at 25 °C - supports continuous operation in compact axial-leaded layouts with linear derating above 50 °C |
| Dynamic Impedance ZZT | 200 Ω - ensures tight voltage regulation under varying load currents in power supply shunt designs |
| Reverse Leakage IR | 0.05 μA @ 11.2 V - enables ultra-low quiescent current in battery-backed or low-power sensing circuits |
| Noise Density | 1 μV/√Hz - minimizes added noise in precision instrumentation amplifier references and ADC bias networks |
| Temp Coefficient αVZ | +0.085 %/°C - allows predictable drift compensation in temperature-stable voltage references |
| Junction Temp Range | –65 °C to +175 °C - supports deployment in aerospace, downhole, and military environments without derating |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed axial-leaded glass package with cathode indicated by band; tin-lead or RoHS-compliant matte-tin plating; weight ≈0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit common or ground; establishes reference node for regulated output |
| Cathode (banded end) | Zener breakdown terminal / regulated voltage output | Applied positive voltage relative to anode to enter breakdown; delivers stable 14.0 V output |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Eliminates interfacial delamination risk during thermal shock, ensuring long-term parameter stability in harsh environments |
| MIL-PRF-19500/435 qualification | Validated reliability up to JANTXV level - meets screening, testing, and traceability requirements for defense and space programs |
| Radiation hardness | Inherently radiation-tolerant per Microsemi MicroNote 050 - suitable for satellite power conditioning and nuclear instrumentation |
| Low capacitance | ≈5 pF typical - preserves high-frequency response in RF detector biasing and fast-switching regulator feedback paths |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling and assembly |
Applications
| Avionics Power Reference | Downhole Sensor Biasing |
|---|---|
Use Scenario: Regulating reference voltage for analog-to-digital converters in flight control computers operating across –55 °C to +125 °C ambient. IC Role / Device Role / Timing Role: Zener diode providing stable 14.0 V reference for precision ADC front-end biasing and op-amp offset calibration. Use Value: JANTXV qualification and –65 °C to +175 °C junction range ensure uninterrupted operation during extreme thermal transients encountered in jet engine bays. | Use Scenario: Supplying bias voltage to piezoresistive pressure sensors deployed in oil/gas well logging tools at 175 °C ambient. IC Role / Device Role / Timing Role: Two-terminal shunt regulator maintaining sensor excitation voltage despite wide input variation and high-temperature drift. Use Value: Radiation hardness and low noise density (1 μV/√Hz) prevent signal corruption in low-level sensor outputs transmitted over long cables. |
| Spacecraft DC-DC Feedback | Military Radio RF Detector |
Use Scenario: Setting output voltage in isolated flyback converter feedback loop aboard LEO satellites subject to total ionizing dose exposure. IC Role / Device Role / Timing Role: Precision voltage reference element in optocoupler-coupled feedback path, replacing integrated TL431 where radiation tolerance is mandatory. Use Value: Inherent radiation hardness eliminates need for shielding or redundancy, reducing mass and complexity in constrained satellite power systems. | Use Scenario: Providing DC bias to Schottky diode RF detectors in tactical HF/VHF transceivers operating in mobile vehicular platforms. IC Role / Device Role / Timing Role: Low-capacitance (≈5 pF) Zener establishing stable detector bias while minimizing RF signal loading and detuning. Use Value: Minimal capacitance and metallurgical bond construction maintain detector sensitivity and frequency response stability across vibration and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | 12 V nominal, 1 W rating, DO-41 package, ±5% tolerance, 22 Ω ZZT, no MIL qualification | Higher power but lower voltage; lacks radiation hardness and military screening | Select when commercial-grade 12 V regulation suffices and cost or availability outweighs reliability requirements |
| 1N5242B | 12 V nominal, 500 mW, DO-35 package, ±5% tolerance, 30 Ω ZZT, commercial-only, no MIL qualification | Same package and power, but lower voltage and unqualified for high-reliability use | Choose only for non-critical industrial prototypes where MIL-PRF-19500 compliance is unnecessary |
Compared with 1N4108-1, the 1N4742A offers higher power but lacks radiation tolerance and military screening, while the 1N5242B matches the DO-35 form factor but omits JANTXV qualification and fails to meet the 14.0 V regulation requirement-making 1N4108-1 irreplaceable in aerospace and defense voltage reference designs.
Availability
1N4108-1 is available at Aetrix Electronics and suitable for avionics power reference, downhole sensor biasing, spacecraft DC-DC feedback, and military radio RF detector applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1N4108-1 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 aerospace-grade components.
The 1N4108-1 belongs to Microsemi's legacy MIL-qualified Zener diode family designed specifically for precision voltage regulation in mission-critical analog systems where parameter stability under thermal, mechanical, and radiation stress is non-negotiable.
FAQ
What is the Zener voltage tolerance for 1N4108-1?
The 1N4108-1 has a nominal Zener voltage of 14.0 V with a standard tolerance of ±5%, as defined in the JEDEC-registered electrical characteristics table. This tolerance applies under thermal equilibrium conditions at 25 °C and is consistent across JAN, JANTX, JANTXV, and JANS reliability levels unless otherwise specified in custom screening.
Is 1N4108-1 radiation hardened?
Yes, the 1N4108-1 is inherently radiation hard as documented in Microsemi MicroNote 050. Its metallurgically bonded construction and glass DO-35 package provide natural tolerance to total ionizing dose (TID) and displacement damage, making it suitable for satellite power systems and nuclear instrumentation without additional shielding.
What is the maximum reverse leakage current for 1N4108-1?
The maximum reverse leakage current (IR) for 1N4108-1 is 0.05 µA measured at 11.2 V (80% of nominal VZ). This ultra-low leakage supports energy-efficient biasing in battery-powered sensors and low-quiescent-current analog circuits where standby power must be minimized.
Does 1N4108-1 have RoHS-compliant versions?
RoHS-compliant versions of 1N4108-1 (marked with suffix "e3") are available for commercial-grade units only. MIL-qualified variants (JAN/JANTX/JANTXV/JANS) retain traditional tin-lead plating to meet solderability and reliability requirements per MIL-STD-750 Method 2026.
What is the thermal resistance junction-to-lead for 1N4108-1?
The thermal resistance junction-to-lead (RθJL) for 1N4108-1 is 250 °C/W when mounted with 3/8 inch (10 mm) lead length from body, per MIL-PRF-19500/435 test conditions. This value enables accurate thermal modeling for PCB layout and heatsinking in high-temperature environments.
1N4108-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 14 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 10.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N4108-1 FAQ
1.How can I place an order for 1N4108-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4108-1 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 1N4108-1 reliable?
The price and inventory of 1N4108-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4108-1 is usually 5 days.
3.What payment methods are accepted for 1N4108-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4108-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4108-1?
1N4108-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4108-1 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 1N4108-1?
For technical support, including 1N4108-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4108-1 requirements.
6.How does Aetrix verify that 1N4108-1 is sourced from the original manufacturer or authorized distributors?
All 1N4108-1 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 1N4108-1 meets industry standards.
7.What is the process for return or replacement of 1N4108-1?
All 1N4108-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4108-1, 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 1N4108-1 part is unused and in its original packaging.
Return procedure for 1N4108-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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