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Microchip Technology 1N4108
- Part No.:
- 1N4108
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4108.pdf
- Description:
- DIODE ZENER 14V 400MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,469
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Product details
Overview
1N4108 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, with 5% voltage tolerance, 200 Ω dynamic impedance at 250 mA test current, and +0.085 %/°C temperature coefficient - used for precision voltage regulation in aerospace power conditioning circuits.
For engineers reviewing the 1N4108 datasheet, 1N4108 pinout, 1N4108 application, or 1N4108 equivalent, this page delivers verified electrical specs, military-grade reliability context, thermal derating behavior, noise density (1 µV/√Hz), and direct alternatives for high-reliability analog reference design.
Technical Context
This Zener diode operates in reverse breakdown with cathode band indicating polarity; it maintains stable 14.0 V regulation across 10.7–40 mA operating current range while exhibiting low noise density and minimal capacitance (typ. <2 pF). Its metallurgically bonded construction ensures mechanical robustness under thermal cycling.
Designed for operation at lead temperature up to +175 °C, the 1N4108 requires linear power derating from 500 mW at +25 °C to zero at +175 °C. It is RoHS-compliant only in commercial-grade versions and non-ESD-sensitive per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 14.0 V at 250 mA - defines nominal regulation point for stable reference generation |
| Power Dissipation | 500 mW at +25 °C lead temp - sets maximum continuous DC power handling before thermal shutdown |
| Zener Impedance ZZT | 200 Ω at IZT = 250 mA - determines output voltage variation under load current changes |
| Temp Coefficient αVZ | +0.085 %/°C - quantifies drift rate of VZ over temperature for stability-critical bias networks |
| Noise Density ND | 1 µV/√Hz - enables low-noise analog references in precision instrumentation front-ends |
| Reverse Leakage IR | 0.05 µA at 10.7 V - ensures minimal parasitic current in high-impedance sensing nodes |
| Max Regulator Current IZM | 40 mA - defines upper limit of safe continuous Zener conduction without exceeding PM(AV) |
Pinout & Package
DO-35 (DO-204AH) axial-leaded hermetically sealed glass package; cathode indicated by single black band on body; leads tinned or RoHS-compliant matte-tin plated; weight ≈ 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; supplies regulated 14.0 V when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualification | JANTXV-level screening ensures suitability for flight-critical avionics and space-qualified systems |
| Metallurgical bond construction | Eliminates interfacial delamination risk under shock/vibration, supporting >100,000-hour MTBF in harsh environments |
| Low noise density | 1 µV/√Hz enables use in low-phase-noise oscillator biasing and precision ADC reference buffers |
| Hermetic glass sealing | Prevents moisture ingress and long-term parameter drift in humid or corrosive atmospheres |
| Non-ESD-sensitive design | Withstands >4 kV HBM without degradation - simplifies handling in uncontrolled assembly environments |
Applications
| Aerospace Power Conditioning | High-Reliability Test Equipment |
|---|---|
Use Scenario: Regulating reference voltage for DC-DC converter feedback loops in satellite power management units. IC Role / Device Role / Timing Role: Zener diode providing stable 14.0 V reference for error amplifier input in isolated flyback controllers. Use Value: JANTXV qualification and +0.085 %/°C TC ensure regulation stability across -55 °C to +125 °C operational envelope. | Use Scenario: Biasing precision op-amp inputs in automated calibration systems for multimeters and DMMs. IC Role / Device Role / Timing Role: Low-noise 14.0 V shunt reference establishing known offset for differential measurement front-ends. Use Value: 1 µV/√Hz noise density prevents signal corruption in sub-microvolt resolution measurements. |
| Avionics Sensor Signal Conditioning | Radiation-Hardened Instrumentation |
Use Scenario: Providing excitation voltage for strain gauge bridges in flight control surface position sensors. IC Role / Device Role / Timing Role: Stable Zener source delivering constant 14.0 V to Wheatstone bridge, enabling ratiometric output scaling. Use Value: Hermetic DO-35 package and metallurgical bond prevent parameter shift during altitude-induced pressure cycling. | Use Scenario: Generating reference voltages in nuclear reactor monitoring electronics exposed to total ionizing dose. IC Role / Device Role / Timing Role: Radiation-hardened Zener regulator maintaining accuracy after 100 krad(Si) exposure per MicroNote 050. Use Value: Inherent radiation hardness eliminates need for shielding or redundancy in safety-critical monitoring paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4108UR-1 | Same electrical specs, DO-213AA surface-mount package instead of DO-35 axial | Required for automated SMT assembly; lacks axial mounting flexibility | Select when board space constraints or reflow-only production demand SMT compatibility |
| 1N4742A | 12 V nominal Zener, 1 W rating, ±5% tolerance, TO-204AE (DO-41) package, no MIL qualification | Suitable for commercial industrial power supplies but not aerospace or defense systems | Choose for cost-sensitive non-military designs where higher power and lower voltage are acceptable |
Compared with 1N4108UR-1, the 1N4108 offers axial-leaded through-hole mounting and JANTXV qualification, while 1N4742A provides higher power and lower cost but lacks radiation hardness, ESD immunity, and military screening - making 1N4108 irreplaceable in flight-critical analog references.
Availability
1N4108 is available at Aetrix Electronics and suitable for aerospace power conditioning, avionics sensor signal conditioning, and radiation-hardened instrumentation requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4108 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 belongs to Microsemi's legacy MIL-PRF-19500/435-qualified Zener diode family, engineered specifically for voltage reference stability in mission-critical defense, space, and nuclear instrumentation systems.
FAQ
What is the Zener voltage tolerance for 1N4108?
The 1N4108 has a nominal Zener voltage of 14.0 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. The 1N4108 does not carry C (±2%) or D (±1%) suffixes, so tighter tolerances require alternate part numbers.
Is 1N4108 suitable for surface-mount assembly?
No - the standard 1N4108 is packaged in the axial-leaded DO-35 (DO-204AH) glass case. For surface-mount use, Microsemi offers the 1N4108UR-1 variant in DO-213AA package. The 1N4108 itself requires through-hole soldering and cannot be placed via pick-and-place equipment without mechanical adaptation.
What is the maximum operating temperature for 1N4108?
The 1N4108 supports junction and storage temperatures from –65 °C to +175 °C. Its rated average power dissipation linearly derates from 500 mW at +25 °C lead temperature to zero at +175 °C. Operation above +125 °C requires careful thermal modeling using RθJL = 250 °C/W and verified lead length per MIL-PRF-19500/435.
Does 1N4108 meet RoHS requirements?
The 1N4108 is RoHS-compliant only in commercial-grade versions (with "e3" suffix, e.g., 1N4108-1e3); military-grade variants (JAN/JANTX/JANTXV/JANS) are exempt from RoHS per MIL-PRF-19500/435 and use tin-lead plating. Always verify suffix and grade on the manufacturer's label or traceable certificate of conformance.
How is polarity marked on the 1N4108 package?
The 1N4108 uses a single black cathode band on the glass body to indicate polarity. During Zener regulation, the banded end must be held positive relative to the unbanded (anode) end. Reversing polarity subjects the device to forward conduction only, limiting voltage drop to ~1.1 V at 200 mA - insufficient for regulation.
1N4108 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 14 V
- Tolerance:
- ±5%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 10.65 V
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N4108 FAQ
1.How can I place an order for 1N4108 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4108 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 reliable?
The price and inventory of 1N4108 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4108 is usually 5 days.
3.What payment methods are accepted for 1N4108?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4108 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4108?
1N4108 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4108 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?
For technical support, including 1N4108 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4108 requirements.
6.How does Aetrix verify that 1N4108 is sourced from the original manufacturer or authorized distributors?
All 1N4108 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 meets industry standards.
7.What is the process for return or replacement of 1N4108?
All 1N4108 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4108, 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 part is unused and in its original packaging.
Return procedure for 1N4108:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4108 Tags
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