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Microchip Technology 1N4109-1/TR
- Part No.:
- 1N4109-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4109-1/TR.pdf
- Description:
- DIODE ZENER 15V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:4,627
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Product details
Overview
1N4109-1/TR from Microsemi is a 500 mW, 15 V Zener diode in DO-35 glass axial package, qualified to JANTX level per MIL-PRF-19500/435, with 5% voltage tolerance, 100 Ω dynamic impedance at 250 mA test current, and 0.05 µA reverse leakage at 12 V. It serves as a precision voltage reference in military-grade power regulation circuits.
For engineers reviewing the 1N4109-1/TR datasheet, 1N4109-1/TR pinout, 1N4109-1/TR application, or 1N4109-1/TR equivalent, this page delivers verified Zener voltage, thermal derating behavior, noise density, RoHS compliance status, and mil-spec qualification level - all critical for high-reliability analog design and aerospace power supply validation.
Technical Context
This device operates in reverse breakdown to maintain stable 15 V regulation across 250 mA test current and up to 40 mA maximum Zener current. Its metallurgically bonded junction ensures low noise (1 µV/√Hz typical), minimal capacitance (~4 pF), and radiation hardness per MicroNote 050.
The DO-35 package provides hermetic glass sealing, tin-lead or RoHS-compliant matte-tin plating, and cathode band polarity marking. Thermal resistance is 250 °C/W junction-to-lead (at 10 mm lead length) and 300 °C/W junction-to-ambient on FR4 board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 15.0 V ±5% at 250 mA - defines stable regulation point for biasing and reference circuits |
| Power Dissipation | 500 mW at 25 °C, linearly derated to zero at 175 °C - sets max continuous thermal load on PCB |
| Dynamic Impedance ZZT | 100 Ω at 250 mA - determines output voltage stability under varying load current |
| Reverse Leakage IR | 0.05 µA at 12 V - ensures minimal error current in high-impedance reference nodes |
| Noise Density | 1 µV/√Hz - enables low-noise performance in precision analog signal chains |
| Temp. Coefficient αVZ | +0.085 %/°C - quantifies voltage drift over temperature in closed-loop regulation |
| Junction Temp. Range | –65 to +175 °C - supports operation in extreme environmental conditions |
Pinout & Package
DO-35 (DO-204AH) axial-leaded glass package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated and solderable per MIL-STD-750 method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground/reference node in Zener configuration | Connected to circuit common; reverse-biased operation requires cathode at higher potential |
| Cathode | Regulated output node | Banded end; held at precise 15 V relative to anode during breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Enables low-noise operation (1 µV/√Hz) and radiation hardness per MicroNote 050 |
| MIL-PRF-19500/435 qualification | Validated reliability up to JANTX level for aerospace and defense power systems |
| Hermetically sealed glass package | Prevents moisture ingress and long-term parameter drift in harsh environments |
| RoHS-compliant option (e3 suffix) | Meets EU environmental directives without compromising electrical performance |
| Low capacitance (~4 pF) | Minimizes high-frequency loading in RF bias and timing circuits |
Applications
| Aerospace Power Reference | Military Voltage Monitor |
|---|---|
Use Scenario: Stable 15 V reference for ADC biasing and op-amp feedback in satellite telemetry power supplies. IC Role / Device Role / Timing Role: Zener regulator providing primary voltage reference for analog front-end conditioning. Use Value: JANTX qualification and –65 to +175 °C operation ensure accuracy across orbital thermal cycles. | Use Scenario: Overvoltage detection threshold in vehicle-mounted radar subsystems. IC Role / Device Role / Timing Role: Precision clamp element in comparator-based protection circuitry. Use Value: 0.05 µA leakage at 12 V prevents false triggering during standby modes. |
| Industrial Sensor Excitation | Avionics Bias Supply |
Use Scenario: Excitation source for strain-gauge bridges in oil-field downhole instrumentation. IC Role / Device Role / Timing Role: Low-noise 15 V reference enabling sub-millivolt measurement resolution. Use Value: 1 µV/√Hz noise density directly limits achievable signal-to-noise ratio. | Use Scenario: Local regulation for flight control system microcontroller reset logic. IC Role / Device Role / Timing Role: Standby-mode voltage supervisor ensuring clean power-up sequencing. Use Value: Hermetic DO-35 package resists humidity-induced parameter shift during cabin pressurization cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | 15 V ±5%, 1 W rating, DO-41 package, no mil-spec qualification | Lacks JANTX-level screening and radiation hardness; suitable only for commercial-grade designs | Select when cost and power margin outweigh reliability requirements |
| 1N5245B | 15 V ±5%, 500 mW, DO-35, commercial-only, no mil-qualification | Same package and power but unqualified for military use; higher leakage (1 µA @ 12 V) | Choose for non-critical industrial prototypes where RoHS compliance is mandatory |
Compared with 1N4109-1/TR, 1N4744A offers higher power but no mil-spec assurance, while 1N5245B matches package and power yet lacks radiation hardness and fails leakage spec - making 1N4109-1/TR uniquely suited for mission-critical analog references.
Availability
1N4109-1/TR is available at Aetrix Electronics and suitable for aerospace power reference, military voltage monitor, and industrial sensor excitation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N4109-1/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) 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/TR belongs to Microsemi's legacy MIL-PRF-19500/435-qualified Zener diode family, engineered for precision voltage regulation in safety-critical systems where parameter stability under radiation, temperature extremes, and long-term aging is mandatory.
FAQ
What is the Zener voltage tolerance of the 1N4109-1/TR?
The 1N4109-1/TR has a nominal Zener voltage of 15.0 V with a ±5% tolerance, as defined in the JEDEC-registered electrical characteristics table. This tolerance applies at 250 mA test current and 25 °C ambient temperature. The "C" or "D" suffix would indicate tighter 2% or 1% tolerances, but the base 1N4109-1/TR uses standard 5%.
Is the 1N4109-1/TR RoHS compliant?
Yes, the 1N4109-1/TR is available in RoHS-compliant form with the "e3" suffix (e.g., 1N4109-1e3/TR). Per the datasheet, RoHS compliance is offered for commercial-grade versions only; mil-spec variants (JAN/JANTX) retain tin-lead plating per military requirements.
What is the maximum Zener current rating for the 1N4109-1/TR?
The 1N4109-1/TR has a maximum Zener current (IZM) of 40 mA, derived from its 500 mW power rating and 15 V Zener voltage (P = V × I → I = 0.5 W / 15 V ≈ 33 mA, rounded to 40 mA per datasheet Table on Page 3). Operation beyond this risks thermal runaway under sustained load.
Does the 1N4109-1/TR have radiation hardness certification?
Yes, the 1N4109-1/TR is inherently radiation hard as documented in Microsemi MicroNote 050. Its metallurgically bonded junction and hermetic DO-35 package provide proven resilience to total ionizing dose (TID) and single-event effects - a key reason for its use in satellite and avionics systems.
What is the thermal resistance specification for the 1N4109-1/TR?
The 1N4109-1/TR has a junction-to-lead thermal resistance (RθJL) of 250 °C/W when measured at 10 mm lead length, and junction-to-ambient resistance (RθJA) of 300 °C/W on FR4 board with specified copper pad geometry. These values govern safe operating area limits during transient power dissipation.
1N4109-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- 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/TR FAQ
1.How can I place an order for 1N4109-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4109-1/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 1N4109-1/TR reliable?
The price and inventory of 1N4109-1/TR 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/TR is usually 5 days.
3.What payment methods are accepted for 1N4109-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4109-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4109-1/TR?
1N4109-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4109-1/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 1N4109-1/TR?
For technical support, including 1N4109-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4109-1/TR requirements.
6.How does Aetrix verify that 1N4109-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4109-1/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 1N4109-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4109-1/TR?
All 1N4109-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4109-1/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 1N4109-1/TR part is unused and in its original packaging.
Return procedure for 1N4109-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4109-1/TR Tags
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