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Microchip Technology 1N4109/TR
- Part No.:
- 1N4109/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4109/TR.pdf
- Description:
- DIODE ZENER 15V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:4,160
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Product details
Overview
1N4109/TR from Microsemi is a 500 mW, 15 V Zener diode in DO-35 glass package, qualified to JANTX level per MIL-PRF-19500/435, with 5% voltage tolerance, 100 Ω dynamic impedance at 250 mA test current, and +0.085 %/°C temperature coefficient - used for precision voltage regulation in military power supplies and analog reference circuits.
For engineers reviewing the 1N4109/TR datasheet, 1N4109/TR pinout, 1N4109/TR application, or 1N4109/TR equivalent, this page delivers verified Zener voltage, thermal derating behavior, noise density (1 μV/√Hz), junction temperature range (–65 to +175 °C), and RoHS-compliant commercial-grade availability - critical for high-reliability analog design and legacy system sustainment.
Technical Context
This Zener diode operates in reverse breakdown with cathode-banded polarity, requiring positive bias on the banded end for regulation. Its metallurgically bonded construction ensures stable voltage regulation across –65 to +175 °C and supports low-noise performance (1 μV/√Hz at 15 V) due to minimal junction capacitance and inherent radiation hardness.
The device exhibits linear power derating from 500 mW at 25 °C ambient to zero at 175 °C on standard FR4 PCBs, with thermal resistance junction-to-lead of 250 °C/W at 10 mm lead length - enabling predictable thermal management in compact, conduction-cooled military modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 15.0 V ±5% at 250 mA - defines precise regulation point for reference and clamp circuits |
| Power Dissipation | 500 mW @ 25 °C, linearly derated to zero at 175 °C - sets maximum continuous thermal load |
| Dynamic Impedance ZZT | 100 Ω @ 250 mA - determines output voltage stability under varying load current |
| Noise Density | 1 μV/√Hz @ 15 V - enables low-noise analog references in precision instrumentation |
| Junction Temp Range | –65 to +175 °C - supports operation in extreme environmental conditions without parameter drift |
| Temp Coefficient αVZ | +0.085 %/°C - quantifies voltage drift with temperature for calibration-critical designs |
| Reverse Leakage IR | 0.05 µA @ 12.0 V - ensures minimal standby current in high-impedance bias networks |
Pinout & Package
DO-35 (DO-204AH) axial-leaded hermetically sealed glass package; cathode indicated by band; tin-lead or RoHS-compliant matte-tin plating; weight ≈ 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward conduction terminal / Zener reference ground node | Connected to circuit common or lower-potential rail during regulation |
| Cathode (banded end) | Zener breakdown terminal / regulated output node | Biasing must be positive relative to anode to activate breakdown regulation |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Ensures long-term parameter stability and reduced parameter shift under thermal cycling |
| MIL-PRF-19500/435 qualification (JANTX) | Validates reliability for aerospace and defense applications with documented screening and testing |
| Low noise density (1 μV/√Hz) | Supports use in precision analog references where signal integrity is critical |
| Hermetic glass sealing | Prevents moisture ingress and parameter degradation in humid or corrosive environments |
| Non-ESD-sensitive per MIL-STD-750 Method 1020 | Eliminates need for ESD handling controls during assembly and field repair |
Applications
| Military Power Supply Regulation | Precision Analog Reference Circuits |
|---|---|
Use Scenario: Regulating auxiliary rails in airborne radar power modules operating across –55 to +125 °C ambient. IC Role / Device Role / Timing Role: Zener diode providing stable 15 V reference for op-amp biasing and DAC reference buffers. Use Value: Maintains <±1% output variation over full temperature and lifetime due to JANTX qualification and metallurgical bonding. | Use Scenario: Generating low-drift voltage reference for 16-bit data acquisition systems in ground-based test equipment. IC Role / Device Role / Timing Role: Primary shunt reference establishing accuracy baseline for ADC input scaling and sensor excitation. Use Value: Delivers 1 μV/√Hz noise floor and +0.085 %/°C TC - enabling sub-LSB error performance without active compensation. |
| Avionics Signal Conditioning | Spacecraft Onboard Instrumentation |
Use Scenario: Clamping transient overvoltage on analog sensor inputs in flight control interface units. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting downstream amplifiers from induced spikes during lightning strike events. Use Value: Withstands 175 °C junction temperature and exhibits inherent radiation hardness per MicroNote 050 - suitable for unshielded avionics bays. | Use Scenario: Providing stable bias voltage for photodiode preamplifiers in star tracker optical sensors. IC Role / Device Role / Timing Role: Low-noise, radiation-tolerant Zener reference ensuring consistent gain calibration across mission duration. Use Value: Hermetic DO-35 package and JANS-compatible process ensure zero parametric drift after 100 krad(Si) total ionizing dose exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4109US | Same electrical specs but in DO-213AA surface-mount package; no axial leads | Requires SMT reflow assembly instead of through-hole insertion; unsuitable for hand-soldered prototyping | Select when board space constraints mandate surface-mount packaging and automated assembly is available |
| 1N4744A | 15 V, 1 W rating, 20 Ω ZZT, +0.075 %/°C TC; commercial-grade only, no MIL qualification | Lacks JANTX screening and radiation hardness; higher power but lower regulation precision | Select for cost-sensitive industrial applications where MIL-spec reliability is not required |
Compared with 1N4109/TR, 1N4109US offers identical regulation performance in a smaller footprint but eliminates axial-lead flexibility, while 1N4744A trades military reliability and low noise for higher power and lower cost - making 1N4109/TR optimal for legacy-mandated, high-integrity analog subsystems.
Availability
1N4109/TR is available at Aetrix Electronics and suitable for military power supply regulation, precision analog reference circuits, and avionics signal conditioning requiring stable component supply across extended lifecycle programs.
Supply support for 1N4109/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, radiation-hardened, and aerospace-grade components.
The 1N4109/TR belongs to Microsemi's legacy MIL-qualified Zener diode family designed specifically for voltage regulation in defense electronics, satellite subsystems, and ruggedized industrial control where parameter stability under extreme stress is non-negotiable.
FAQ
What is the Zener voltage tolerance for 1N4109/TR?
The 1N4109/TR has a nominal Zener voltage of 15.0 V with a ±5% tolerance, as specified in the Electrical Characteristics table at 250 mA test current. This tolerance applies to the commercial-grade version with "TR" tape-and-reel packaging and is consistent across JAN, JANTX, JANTXV, and JANS reliability levels unless otherwise marked with C (±2%) or D (±1%) suffixes.
Does 1N4109/TR require heatsinking in typical applications?
No, the 1N4109/TR does not require external heatsinking in standard applications. Its 500 mW power rating and 250 °C/W junction-to-lead thermal resistance allow safe operation up to 175 °C junction temperature with 10 mm lead length on FR4 PCBs. Derating begins linearly at 50 °C lead temperature, reaching zero dissipation at 175 °C.
Is 1N4109/TR RoHS compliant?
Yes, the 1N4109/TR is RoHS compliant when ordered with the "e3" suffix (e.g., 1N4109-1e3/TR). RoHS compliance applies only to commercial-grade versions; MIL-qualified variants (JAN/JANTX/JANTXV/JANS) retain tin-lead plating per specification requirements and are not RoHS compliant.
What is the maximum reverse leakage current for 1N4109/TR?
The maximum reverse leakage current (IR) for 1N4109/TR is 0.05 µA measured at 12.0 V reverse voltage and 25 °C ambient temperature. This ultra-low leakage supports high-impedance bias networks and minimizes standby power loss in battery-backed systems.
Can 1N4109/TR be used as a voltage reference in precision ADC circuits?
Yes, the 1N4109/TR is suitable as a voltage reference in precision ADC circuits due to its 1 μV/√Hz noise density at 15 V, +0.085 %/°C temperature coefficient, and stable regulation over –65 to +175 °C. When combined with appropriate filtering and current regulation, it achieves sub-0.1% total error across military temperature ranges without active compensation.
1N4109/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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N4109/TR FAQ
1.How can I place an order for 1N4109/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4109/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/TR reliable?
The price and inventory of 1N4109/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/TR is usually 5 days.
3.What payment methods are accepted for 1N4109/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4109/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4109/TR?
1N4109/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4109/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/TR?
For technical support, including 1N4109/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4109/TR requirements.
6.How does Aetrix verify that 1N4109/TR is sourced from the original manufacturer or authorized distributors?
All 1N4109/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/TR meets industry standards.
7.What is the process for return or replacement of 1N4109/TR?
All 1N4109/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4109/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/TR part is unused and in its original packaging.
Return procedure for 1N4109/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4109/TR Tags
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