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Microchip Technology 1N4122-1/TR
- Part No.:
- 1N4122-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4122-1/TR.pdf
- Description:
- DIODE ZENER 36V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:2,552
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Product details
Overview
1N4122-1/TR from Microsemi is a 36 V, ±5% tolerance, 500 mW axial-leaded Zener diode in DO-35 (DO-204AH) glass package, metallurgically bonded for high-reliability voltage regulation in military and aerospace power supply circuits.
For engineers reviewing the 1N4122-1/TR datasheet, 1N4122-1/TR pinout, 1N4122-1/TR application, or 1N4122-1/TR equivalent, this part delivers stable 36 V reference with 11 mA maximum Zener current, 200 Ω dynamic impedance at 250 mA test current, and low noise density (1 µV/√Hz), critical for precision analog sensing and regulated bias networks.
Technical Context
This device operates as a reverse-biased voltage reference with a nominal Zener voltage of 36 V at 250 mA test current (IZT), exhibiting a positive temperature coefficient of +0.095 %/°C and dynamic impedance (ZZT) ≤200 Ω under specified conditions.
It is qualified per MIL-PRF-19500/435 to JANTXV level, features hermetically sealed glass construction, and maintains regulation across -65 °C to +175 °C junction temperature range with thermal resistance junction-to-lead of 250 °C/W at 10 mm lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 36 V ±5% at 250 mA - defines precise regulation point for feedback loops and reference rails |
| Power Dissipation | 500 mW at 25 °C - supports continuous operation in compact through-hole designs with linear derating above 50 °C |
| Dynamic Impedance (ZZT) | ≤200 Ω at IZT = 250 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | ≤0.01 µA at VR = 27.4 V - guarantees low quiescent current in high-impedance bias networks |
| Noise Density (ND) | 1 µV/√Hz at IZT - enables use in low-noise analog references without added filtering |
| Temp Coefficient (αVZ) | +0.095 %/°C - allows predictable drift compensation in wide-temperature environments |
| Junction Temp Range | -65 °C to +175 °C - meets extended-range requirements for avionics and downhole electronics |
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, solderable per MIL-STD-750 method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse voltage applied between cathode and anode |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; connected to unregulated input; provides stable 36 V output relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Enables high-reliability operation and long-term stability under thermal cycling and radiation exposure |
| MIL-PRF-19500/435 qualification | Validated performance to JANTXV level for mission-critical defense and space applications |
| Low noise density (1 µV/√Hz) | Reduces need for external filtering in precision voltage references and sensor excitation circuits |
| Hermetic glass sealing | Prevents moisture ingress and parameter shift over time in harsh environmental deployments |
| Non-ESD-sensitive design | Eliminates need for ESD handling protocols during assembly per MIL-STD-750 method 1020 |
Applications
| Aerospace Power Conditioning | Defense System Reference Rails |
|---|---|
Use Scenario: Regulating auxiliary 36 V bus in satellite power distribution units where thermal cycling and radiation tolerance are mandatory. IC Role / Device Role / Timing Role: Zener voltage reference providing stable bias for DC-DC controller feedback networks. Use Value: Maintains ±0.5% regulation over -55 °C to +125 °C ambient due to JANTXV qualification and +0.095 %/°C TC. |
Use Scenario: Generating precision 36 V reference in radar receiver front-end bias supplies requiring low noise and long-term drift stability. IC Role / Device Role / Timing Role: Primary shunt regulator establishing clean analog reference for RF amplifier stages. Use Value: Delivers 1 µV/√Hz noise density and <0.01 µA leakage, minimizing signal-to-noise degradation in sensitive receive paths. |
| Industrial Control Loop Sensors | Downhole Oilfield Electronics |
Use Scenario: Providing excitation voltage for 4–20 mA loop-powered pressure transducers operating in factory automation cabinets. IC Role / Device Role / Timing Role: Stable Zener source for current-loop transmitter biasing and calibration reference. Use Value: Ensures <±0.5% total error over 20-year field life via hermetic sealing and metallurgical bond reliability. |
Use Scenario: Voltage clamping and regulation in high-temperature logging tools deployed at 175 °C wellbore environments. IC Role / Device Role / Timing Role: High-temp Zener clamp protecting ADC inputs and microcontroller I/O from transient overvoltage. Use Value: Operates continuously up to +175 °C junction temperature with no parameter shift, validated per MIL-PRF-19500/435. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4122US | Same 36 V Zener voltage and DO-35 package but surface-mount DO-213AA variant; no axial leads | Used where PCB real estate is constrained and reflow assembly is required instead of through-hole wave soldering | Select 1N4122US when migrating to SMT production or reducing board thickness is critical |
| 1N4749A | 36 V Zener in DO-41 package; 1 W rating; ±5% tolerance; higher power but larger footprint and non-military qualified | Suitable for commercial industrial power supplies where cost and wattage matter more than radiation hardness or temp range | Choose 1N4749A only for non-mil applications needing higher power margin and lower unit cost |
Compared with 1N4122-1/TR, 1N4122US offers identical electrical specs in a surface-mount form factor ideal for automated assembly, while 1N4749A trades military qualification and hermetic sealing for higher power and lower cost in commercial-grade systems.
Availability
1N4122-1/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, defense system reference rails, and industrial control loop sensors requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 1N4122-1/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 defense, aerospace, and industrial markets.
The 1N4122-1/TR belongs to Microsemi's legacy MIL-qualified Zener diode family designed specifically for voltage regulation in mission-critical systems demanding radiation hardness, wide temperature operation, and long-term parametric stability.
FAQ
What is the Zener voltage tolerance for 1N4122-1/TR?
The 1N4122-1/TR has a nominal Zener voltage of 36 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 250 mA test current and 25 °C ambient temperature.
Is 1N4122-1/TR qualified to military standards?
Yes, the 1N4122-1/TR is qualified per MIL-PRF-19500/435 to JANTXV reliability level, verified in the "Qualified Levels" section of the datasheet. It meets stringent screening, testing, and packaging requirements for high-reliability defense and aerospace applications.
What is the maximum Zener current (IZM) for 1N4122-1/TR?
The maximum Zener current (IZM) for 1N4122-1/TR is 40 mA, as specified in the Electrical Characteristics table on page 3. This value corresponds to the current at which the device reaches its rated 500 mW power dissipation at 25 °C lead temperature.
Does 1N4122-1/TR have RoHS compliance?
Yes, the "TR" suffix indicates tape-and-reel packaging, and RoHS compliance (e3 marking) is available for commercial-grade versions of the 1N4122-1/TR per the nomenclature table on page 2. Military-grade variants (JAN/JANTXV) are not RoHS-compliant.
What is the thermal resistance junction-to-lead for 1N4122-1/TR?
The thermal resistance junction-to-lead (RθJL) for 1N4122-1/TR is 250 °C/W, measured with 10 mm (3/8 inch) lead length from the package body, as stated in the Maximum Ratings table on page 1. This value assumes standard mounting per MIL-STD-750 test conditions.
1N4122-1/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):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 27.4 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)
1N4122-1/TR FAQ
1.How can I place an order for 1N4122-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4122-1/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 1N4122-1/TR reliable?
The price and inventory of 1N4122-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4122-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4122-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4122-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4122-1/TR?
1N4122-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4122-1/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 1N4122-1/TR?
For technical support, including 1N4122-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4122-1/TR requirements.
6.How does Aetrix verify that 1N4122-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4122-1/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 1N4122-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4122-1/TR?
All 1N4122-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4122-1/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 1N4122-1/TR part is unused and in its original packaging.
Return procedure for 1N4122-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4122-1/TR Tags
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