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Microchip Technology 1N4122/TR
- Part No.:
- 1N4122/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4122/TR.pdf
- Description:
- DIODE ZENER 36V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:6,430
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Product details
Overview
1N4122/TR from Microsemi is a 36 V, 500 mW axial-leaded glass Zener diode in DO-35 (DO-204AH) package, qualified to JANTXV level per MIL-PRF-19500/435, with ±5% voltage tolerance, 200 Ω dynamic impedance at 250 mA test current, and 0.01 µA maximum reverse leakage at 27.4 V. It delivers stable voltage regulation in high-reliability power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4122/TR datasheet, 1N4122/TR pinout, 1N4122/TR application, or 1N4122/TR equivalent, this part supports precision DC reference design, aerospace-grade biasing, and ruggedized analog signal conditioning where hermetic sealing, radiation hardness, and temperature-stable Zener voltage are required.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-biased breakdown mode, with metallurgical bonding ensuring low noise density (1 µV/√Hz typical at low voltages) and minimal capacitance. Its thermal resistance junction-to-lead is 250 °C/W at 10 mm lead length, enabling stable operation up to +175 °C junction temperature.
The 1N4122/TR exhibits a positive temperature coefficient of +0.095 %/°C for Zener voltage, linear power derating from 500 mW at 25 °C to zero at 175 °C, and complies with MIL-STD-750 method 1020 for ESD insensitivity - critical for deployment in avionics and space-qualified systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 36 V at 250 mA test current - defines precise regulation point for feedback loops and reference rails. |
| Power Dissipation | 500 mW at 25 °C - sets maximum continuous DC power handling before thermal derating applies. |
| Zener Impedance ZZT | 200 Ω at IZT = 250 mA - determines output voltage stability under load variation. |
| Reverse Leakage IR | 0.01 µA at VR = 27.4 V - ensures minimal quiescent current in standby or high-impedance sensing paths. |
| Temp Coefficient αVZ | +0.095 %/°C - quantifies voltage drift across operating temperature range; enables compensation in precision references. |
| Noise Density | 1 µV/√Hz (typical) - supports low-noise analog front-ends and metrology-grade references. |
| Junction Temp Range | –65 to +175 °C - validates suitability for extended-temperature military and downhole applications. |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed axial-glass package with cathode band marking; 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 common or ground when used in standard shunt regulator configuration. |
| Cathode | Zener regulation terminal / input node for regulated voltage | Banded end; connected to unregulated input rail; maintains fixed 36 V drop relative to anode during breakdown. |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Enables low noise density (1 µV/√Hz) and long-term parameter stability under thermal cycling. |
| MIL-PRF-19500/435 qualification | Validated reliability at JANTXV level - meets screening, testing, and traceability requirements for defense/aerospace programs. |
| Hermetic glass encapsulation | Prevents moisture ingress and parametric shift in humid or corrosive environments; supports >20-year field life. |
| Radiation hardness | Inherently resistant to total ionizing dose (TID) per Microsemi MicroNote 050 - suitable for low-earth orbit electronics. |
| ESD insensitivity | Non-sensitive per MIL-STD-750 method 1020 - eliminates need for external ESD protection in handling and assembly. |
Applications
| Aerospace Power Reference | Avionics Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 36 V reference for ADC biasing and sensor excitation in flight control computers. IC Role / Device Role / Timing Role: Shunt Zener regulator establishing precision DC reference voltage independent of supply ripple. Use Value: Maintains <±0.5% regulation over –55 to +125 °C ambient with <1 µV/√Hz noise, preserving measurement integrity. | Use Scenario: Clamping transient surges on 28 V aircraft bus lines to protect downstream FPGAs and microcontrollers. IC Role / Device Role / Timing Role: Two-terminal crowbar element absorbing energy above 36 V while limiting clamped voltage to safe levels. Use Value: Withstands 0.01 µA leakage at 27.4 V and survives repeated transients due to hermetic DO-35 construction and JANTXV screening. |
| Downhole Instrumentation Bias | Military Radio RF Stage Bias |
Use Scenario: Supplying regulated bias to piezoelectric sensor amplifiers in oil/gas well logging tools operating at 175 °C. IC Role / Device Role / Timing Role: High-temperature Zener reference maintaining accuracy where silicon ICs fail. Use Value: Junction temperature rating up to +175 °C and +0.095 %/°C tempco enable predictable drift compensation in closed-loop calibration. | Use Scenario: Setting gate voltage for GaN RF power amplifiers in tactical radios exposed to wide thermal swings. IC Role / Device Role / Timing Role: Low-capacitance (<2 pF typical), low-noise Zener providing stable DC bias without RF coupling. Use Value: Minimal capacitance and 200 Ω dynamic impedance prevent RF instability and maintain amplifier linearity across 2–6 GHz bands. |
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 electrical specs but in surface-mount DO-213AA package; no axial leads. | Requires SMT reflow process; unsuitable for through-hole prototyping or high-vibration mechanical retention. | Select when board space is constrained and automated assembly is used. |
| 1N4122-1 | Identical DO-35 package and electrical performance; differs only in RoHS compliance status (1N4122-1 is non-RoHS, 1N4122/TR is RoHS-compliant e3 grade). | 1N4122/TR supports modern environmental compliance mandates; 1N4122-1 remains viable for legacy repair or non-RoHS programs. | Choose 1N4122/TR for new designs requiring RoHS; retain 1N4122-1 only for exact form-fit-function replacement in legacy systems. |
Compared with 1N4122US and 1N4122-1, the 1N4122/TR uniquely combines RoHS compliance, axial-leaded DO-35 mechanical robustness, and JANTXV qualification - making it the sole option for new high-reliability through-hole designs requiring full environmental and screening compliance.
Availability
1N4122/TR is available at Aetrix Electronics and suitable for aerospace power reference, avionics overvoltage clamp, and downhole instrumentation bias applications requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for 1N4122/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N4122/TR belongs to Microsemi's legacy MIL-qualified Zener diode family, engineered specifically for mission-critical voltage regulation where hermeticity, radiation tolerance, and extended temperature operation are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4122/TR?
The 1N4122/TR has a nominal Zener voltage of 36 V with a standard tolerance of ±5%, as defined by JEDEC registration and confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2. This tolerance applies under thermal equilibrium at 25 °C with 250 mA test current, and is consistent across all commercial and screened versions of the 1N4122/TR.
Is 1N4122/TR suitable for high-temperature environments?
Yes, the 1N4122/TR is rated for junction temperatures from –65 to +175 °C and features linear power derating from 500 mW at 25 °C to zero at 175 °C. Its metallurgically bonded glass construction and MIL-PRF-19500/435 qualification make it validated for sustained operation in downhole, engine bay, and avionics enclosure environments where ambient temperatures exceed 125 °C.
Does 1N4122/TR have RoHS compliance certification?
Yes, the "TR" suffix in 1N4122/TR indicates RoHS-compliant (e3) plating per the part nomenclature guide in the datasheet. This applies to the commercial-grade version only and is verified in the Mechanical and Packaging section (page 2), confirming annealed matte-tin plating compliant with EU Directive 2011/65/EU.
What is the maximum reverse leakage current for 1N4122/TR?
The maximum reverse leakage current (IR) for 1N4122/TR is 0.01 µA measured at VR = 27.4 V, as specified in the Electrical Characteristics table (page 3). This ultra-low leakage supports high-impedance bias networks and precision reference circuits where parasitic current paths must be minimized.
How does the temperature coefficient affect 1N4122/TR performance?
The 1N4122/TR has a Zener voltage temperature coefficient of +0.095 %/°C, meaning its regulated voltage increases predictably with rising temperature. This positive, linear drift enables straightforward compensation in closed-loop references and allows designers to calculate worst-case voltage deviation across the full –65 to +175 °C junction range without additional characterization.
1N4122/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, 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 @ 27.38 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-7 (DO-204AA)
1N4122/TR FAQ
1.How can I place an order for 1N4122/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4122/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/TR reliable?
The price and inventory of 1N4122/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/TR is usually 5 days.
3.What payment methods are accepted for 1N4122/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4122/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4122/TR?
1N4122/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4122/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/TR?
For technical support, including 1N4122/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4122/TR requirements.
6.How does Aetrix verify that 1N4122/TR is sourced from the original manufacturer or authorized distributors?
All 1N4122/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/TR meets industry standards.
7.What is the process for return or replacement of 1N4122/TR?
All 1N4122/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4122/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/TR part is unused and in its original packaging.
Return procedure for 1N4122/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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