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Microchip Technology 1N4108/TR
- Part No.:
- 1N4108/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4108/TR.pdf
- Description:
- DIODE ZENER 14V 400MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,667
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Product details
Overview
1N4108/TR from Microsemi is a 500 mW, 14.0 V Zener diode in DO-35 glass axial package, qualified to JANTX level per MIL-PRF-19500/435, with 5% voltage tolerance, 200 Ω dynamic impedance at 250 mA test current, and max reverse leakage of 0.05 µA at 11.2 V. It delivers stable voltage regulation in precision reference and power supply feedback circuits.
For engineers reviewing the 1N4108/TR datasheet, 1N4108/TR pinout, 1N4108/TR application, or 1N4108/TR equivalent, this page provides verified electrical parameters, military-grade qualification status, thermal derating behavior, noise density (1 µV/√Hz), and RoHS-compliant commercial availability with TR tape-and-reel packaging.
Technical Context
This device operates as a two-terminal voltage reference in reverse-biased breakdown mode, with cathode band marking polarity. Its metallurgically bonded construction ensures high reliability under thermal cycling and radiation exposure, supporting operation from –65 °C to +175 °C junction temperature.
The 1N4108/TR exhibits a positive temperature coefficient of +0.085 %/°C and maintains low noise density (1 µV/√Hz) across its operating range. Its 200 Ω dynamic impedance at IZT = 250 mA enables stable regulation under varying load currents in analog and power control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 14.0 V at 250 mA - precise regulation point for mid-range voltage references |
| Power Dissipation | 500 mW at 25 °C - supports continuous operation in compact PCB layouts with linear derating to zero at 175 °C |
| Dynamic Impedance ZZT | 200 Ω at 250 mA - ensures minimal output voltage shift under load transients |
| Reverse Leakage IR | 0.05 µA at 11.2 V - guarantees low standby current in battery-backed or low-power monitoring circuits |
| Noise Density | 1 µV/√Hz - critical for low-noise analog references and sensor excitation circuits |
| Temp Coefficient αVZ | +0.085 %/°C - predictable drift behavior enables accurate temperature compensation in precision designs |
| Package | DO-35 (DO-204AH) - standard axial-glass package compatible with through-hole wave soldering and manual repair |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed axial-leaded glass package. Cathode identified by single black band; diode operated with banded end positive relative to anode for Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; establishes return path for Zener current |
| Cathode | Regulated output node | Banded terminal supplies stable 14.0 V when reverse-biased; connects to feedback or reference input |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualification | JANTX level certified - validated for aerospace, defense, and high-reliability industrial use |
| Metallurgical bond construction | Eliminates interfacial delamination risk - ensures long-term stability under thermal shock and vibration |
| Low noise density | 1 µV/√Hz at 14 V - enables use in precision instrumentation without added filtering |
| Hermetic glass sealing | Prevents moisture ingress and parameter drift - supports 175 °C storage and operation |
| RoHS-compliant plating | Matte-tin termination on commercial grade - meets lead-free assembly requirements without sacrificing solderability |
Applications
| Industrial Power Supply Feedback | Aerospace Voltage Reference |
|---|---|
Use Scenario: Regulates output voltage in isolated DC-DC converters using optocoupler feedback loops. IC Role / Device Role / Timing Role: Zener reference providing stable 14.0 V threshold for TL431 or error amplifier biasing. Use Value: 200 Ω dynamic impedance minimizes feedback loop gain variation across line/load changes. | Use Scenario: Supplies reference voltage to analog-to-digital converters in flight control sensor interfaces. IC Role / Device Role / Timing Role: Precision voltage source for ADC reference buffers in radiation-hardened avionics modules. Use Value: JANTX qualification and +0.085 %/°C tempco enable traceable calibration over –55 °C to +125 °C operational range. |
| Test Equipment Calibration | Medical Instrument Biasing |
Use Scenario: Generates stable bias for op-amp offset nulling in bench multimeters and signal generators. IC Role / Device Role / Timing Role: Low-noise 14.0 V reference replacing higher-cost IC references where 1 µV/√Hz noise floor is sufficient. Use Value: 1 µV/√Hz noise density avoids adding measurable error in sub-100 ppm measurement subsystems. | Use Scenario: Sets operating point for photodiode transimpedance amplifiers in portable ultrasound front-ends. IC Role / Device Role / Timing Role: Low-leakage (0.05 µA) Zener establishing bias in high-impedance analog signal chains. Use Value: Ultra-low IR prevents signal distortion in picoamp-level current sensing paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4108-1 | Same electrical specs but bulk packaging (no TR suffix); non-tape-and-reel | Not suitable for automated SMT placement; requires manual loading or tube feeders | Select 1N4108-1 only for prototyping or low-volume hand-soldered builds |
| 1N4108UR-1 | DO-213AA surface-mount package; identical Zener voltage and tolerance | Requires rework of PCB layout; eliminates axial leads but reduces thermal mass and power handling margin | Choose 1N4108UR-1 when board space constraints mandate SMT or when mixed-technology assembly is standardized |
Compared with 1N4108/TR, the 1N4108-1 lacks tape-and-reel convenience for pick-and-place, while 1N4108UR-1 trades axial thermal performance and repairability for footprint reduction-neither is pin-compatible due to differing packages.
Availability
1N4108/TR is available at Aetrix Electronics and suitable for industrial power supply feedback, aerospace voltage reference, and medical instrument biasing requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 1N4108/TR 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 semiconductors for aerospace, defense, and industrial markets, with expertise in radiation-hardened and mil-qualified components.
The 1N4108/TR belongs to Microsemi's legacy 1N4099–1N4135 Zener series, engineered for precision voltage regulation in mission-critical systems where parameter stability, low noise, and extended temperature operation are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4108/TR?
The 1N4108/TR has a nominal Zener voltage of 14.0 V with a standard ±5% tolerance, consistent with JEDEC registration for the 1N4099–1N4135 family. This tolerance applies at 25 °C with the device in thermal equilibrium and is verified per MIL-PRF-19500/435 test protocols.
Is 1N4108/TR RoHS compliant?
Yes, 1N4108/TR is RoHS compliant (e3 suffix), featuring annealed matte-tin plating on commercial-grade units. Compliance is confirmed per Microsemi documentation T4-LDS-0245-2, and the device meets lead-free soldering requirements up to 260 °C for 10 seconds.
What does the "TR" suffix mean in 1N4108/TR?
The "TR" suffix indicates tape-and-reel packaging per EIA-296 standards, enabling automated surface-mount assembly. The 1N4108/TR is supplied in reels optimized for pick-and-place equipment, distinguishing it from bulk or tube-packaged variants like 1N4108-1.
What is the maximum reverse leakage current for 1N4108/TR?
The maximum reverse leakage current for 1N4108/TR is 0.05 µA at 11.2 V (80% of VZ). This ultra-low leakage is specified in the Electrical Characteristics table on page 3 of Microsemi's T4-LDS-0245-2 datasheet and supports high-impedance biasing applications.
Does 1N4108/TR support high-temperature operation?
Yes, 1N4108/TR is rated for junction and storage temperatures from –65 °C to +175 °C. Its DO-35 glass package and metallurgical bond construction maintain parameter stability across this full range, with linear power derating applied above 50 °C lead temperature per Figure 2.
1N4108/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Tape & Reel (TR)
- 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/TR FAQ
1.How can I place an order for 1N4108/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4108/TR 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/TR reliable?
The price and inventory of 1N4108/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4108/TR is usually 5 days.
3.What payment methods are accepted for 1N4108/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4108/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4108/TR?
1N4108/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4108/TR 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/TR?
For technical support, including 1N4108/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4108/TR requirements.
6.How does Aetrix verify that 1N4108/TR is sourced from the original manufacturer or authorized distributors?
All 1N4108/TR 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/TR meets industry standards.
7.What is the process for return or replacement of 1N4108/TR?
All 1N4108/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4108/TR, 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/TR part is unused and in its original packaging.
Return procedure for 1N4108/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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