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Microchip Technology 1N4109-1
- Part No.:
- 1N4109-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4109-1.pdf
- Description:
- DIODE ZENER 15V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:3,766
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Product details
Overview
1N4109-1 from Microsemi is a 500 mW, 15.0 V ±5% metallurgically bonded glass Zener diode in DO-35 (DO-204AH) package, qualified to JANTXV level per MIL-PRF-19500/435. It delivers stable voltage regulation at 250 mA test current with 100 Ω dynamic impedance, low noise density (1 µV/√Hz), and operates across –65 °C to +175 °C for aerospace power supply reference applications.
For engineers reviewing the 1N4109-1 datasheet, 1N4109-1 pinout, 1N4109-1 application, or 1N4109-1 equivalent, this page provides verified Zener voltage, temperature coefficient (+0.085 %/°C), junction-to-lead thermal resistance (250 °C/W), maximum reverse leakage (0.05 µA @ 12.0 V), and mil-spec qualification level - all critical for high-reliability analog reference design and radiation-hardened systems.
Technical Context
The 1N4109-1 operates as a precision shunt voltage regulator in reverse-biased breakdown mode, with cathode band marking polarity. Its metallurgical bond construction ensures mechanical robustness and long-term stability under thermal cycling and radiation exposure.
It exhibits a positive temperature coefficient of +0.085 %/°C and maintains ≤100 Ω dynamic impedance (ZZT) at IZT = 250 mA, enabling tight regulation across wide current ranges (IZK to IZM = 11.4 mA). Noise density is specified at 1 µV/√Hz - confirmed for 15.0 V devices per Figure 1 test methodology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 15.0 V ±5% at IZT = 250 mA - defines nominal regulation point with predictable tolerance for reference circuit design |
| Power Dissipation | 500 mW at TL = 25 °C - supports stable operation in through-hole power rails with linear derating to zero at 175 °C |
| Dynamic Impedance ZZT | 100 Ω max at IZT = 250 mA - ensures minimal output voltage shift under load transients in feedback networks |
| Reverse Leakage IR | 0.05 µA max at VR = 12.0 V - guarantees negligible error current in high-impedance bias/reference paths |
| Temperature Coefficient αVZ | +0.085 %/°C - enables predictable drift compensation in temperature-critical instrumentation references |
| Noise Density ND | 1 µV/√Hz at IZT = 250 mA - meets low-noise requirements for precision ADC reference buffers and sensor excitation |
| Junction Temp Range | –65 °C to +175 °C - validated for extended-range military, avionics, and downhole electronics environments |
Pinout & Package
Package: DO-35 (DO-204AH), axial-leaded, hermetically sealed glass case with tin-lead or RoHS-compliant matte-tin plating. Cathode indicated by single black band; banded end must be held positive relative to anode for Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to system ground or lowest potential; forms return path for Zener current |
| Cathode (banded end) | Regulated output node | Provides stable 15.0 V reference when reverse-biased; connects to feedback input or load |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualification | JANTXV-level screening ensures reliability for flight-critical and defense-grade power management |
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal shock and vibration, extending field life |
| Low noise density (1 µV/√Hz) | Enables use in ultra-low-noise analog front-ends without requiring external filtering |
| Hermetic glass sealing | Prevents moisture ingress and parameter drift over decades in harsh environmental deployments |
| Radiation hardness | Inherently resistant to total ionizing dose (TID) per MicroNote 050 - suitable for space-qualified designs |
Applications
| Aerospace Power Reference | Defense System Voltage Monitor |
|---|---|
Use Scenario: Providing stable 15.0 V reference for ADCs and DACs in satellite telemetry conditioning circuits. IC Role / Device Role / Timing Role: Shunt voltage reference regulating supply rail against load and temperature variation. Use Value: Maintains <±0.1% output stability over –55 °C to +125 °C due to +0.085 %/°C TC and hermetic packaging. | Use Scenario: Monitoring 28 V aircraft bus voltage via resistive divider into comparator input. IC Role / Device Role / Timing Role: Precision Zener clamp protecting comparator input from overvoltage transients. Use Value: Withstands ESD per MIL-STD-750 Method 1020 and operates reliably after 100 krad(Si) TID exposure. |
| Industrial Sensor Excitation | Radiation-Hardened Instrumentation |
Use Scenario: Supplying constant-current excitation to strain gauge bridges in oilfield downhole tools. IC Role / Device Role / Timing Role: Low-noise 15.0 V source feeding precision current mirror circuitry. Use Value: 1 µV/√Hz noise density prevents signal corruption in sub-mV bridge outputs. | Use Scenario: Serving as primary voltage reference in nuclear reactor control module analog interfaces. IC Role / Device Role / Timing Role: Radiation-tolerant shunt regulator maintaining calibration integrity under neutron flux. Use Value: Validated JANS-level qualification and inherent radiation hardness ensure >20-year operational life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4109UR-1 | Same electrical specs, but in DO-213AA surface-mount package instead of DO-35 axial lead | Requires PCB rework for SMT assembly; unsuitable for through-hole prototyping or wire-wrap | Select when automated pick-and-place and board space constraints outweigh manual assembly needs |
| 1N4744A | 15 V ±5%, 1 W rating, DO-41 package, no mil-spec qualification, higher noise (5 µV/√Hz) | Not suitable for radiation-exposed, high-reliability, or extreme-temperature environments | Choose only for commercial-grade cost-sensitive applications where JANTXV screening is unnecessary |
Compared with 1N4109UR-1 and 1N4744A, the 1N4109-1 uniquely combines JANTXV qualification, 1 µV/√Hz noise, and DO-35 mechanical ruggedness - making it irreplaceable for legacy aerospace hardware refresh and radiation-tolerant analog subsystems.
Availability
1N4109-1 is available at Aetrix Electronics and suitable for aerospace power reference, defense system voltage monitor, and radiation-hardened instrumentation requiring stable component supply across extended temperature and lifecycle demands.
Supply support for 1N4109-1 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 1N4109-1 belongs to Microsemi's legacy MIL-PRF-19500/435-qualified Zener diode family, engineered specifically for precision voltage regulation in mission-critical systems where long-term stability and radiation tolerance are mandatory.
FAQ
What is the Zener voltage tolerance for the 1N4109-1?
The 1N4109-1 has a nominal Zener voltage of 15.0 V with a standard tolerance of ±5%, as defined in the JEDEC-registered specification and confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2 Rev. 1. This tolerance applies at IZT = 250 mA and 25 °C ambient.
Is the 1N4109-1 qualified to JANTXV level?
Yes, the 1N4109-1 is qualified to JANTXV level per MIL-PRF-19500/435, as explicitly stated in the DESCRIPTION section on page 1 of the datasheet. This includes full screening for temperature cycling, burn-in, and parametric testing required for high-reliability defense and aerospace applications.
What is the maximum reverse leakage current for the 1N4109-1?
The maximum reverse leakage current (IR) for the 1N4109-1 is 0.05 µA at VR = 12.0 V, per the Electrical Characteristics table on page 3. This ultra-low leakage supports high-impedance reference circuits without introducing measurable error.
Does the 1N4109-1 have radiation hardness certification?
Yes, the 1N4109-1 is inherently radiation hard, as documented in Microsemi MicroNote 050 referenced on page 1. While not individually certified per MIL-STD-883, its metallurgically bonded glass construction and process heritage provide proven resilience to total ionizing dose (TID) in space and nuclear environments.
What is the thermal resistance junction-to-lead for the 1N4109-1?
The thermal resistance junction-to-lead (RθJL) for the 1N4109-1 is 250 °C/W when measured at 3/8 inch (10 mm) lead length from the body, as specified in the Maximum Ratings table on page 1. This value guides heatsinking decisions for sustained 500 mW operation.
1N4109-1 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):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 11.4 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)
1N4109-1 FAQ
1.How can I place an order for 1N4109-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4109-1 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 1N4109-1 reliable?
The price and inventory of 1N4109-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4109-1 is usually 5 days.
3.What payment methods are accepted for 1N4109-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4109-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4109-1?
1N4109-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4109-1 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 1N4109-1?
For technical support, including 1N4109-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4109-1 requirements.
6.How does Aetrix verify that 1N4109-1 is sourced from the original manufacturer or authorized distributors?
All 1N4109-1 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 1N4109-1 meets industry standards.
7.What is the process for return or replacement of 1N4109-1?
All 1N4109-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4109-1, 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 1N4109-1 part is unused and in its original packaging.
Return procedure for 1N4109-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4109-1 Tags
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