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Microchip Technology 1N4122-1
- Part No.:
- 1N4122-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4122-1.pdf
- Description:
- DIODE ZENER 36V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:4,648
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Product details
Overview
1N4122-1 from Microsemi is a 500 mW, 36 V, ±5% tolerance metallurgically bonded glass Zener diode in DO-35 (DO-204AH) axial package, qualified to JANTXV level per MIL-PRF-19500/435 for high-reliability voltage regulation in aerospace power supplies and precision reference circuits.
For engineers reviewing the 1N4122-1 datasheet, 1N4122-1 pinout, 1N4122-1 application, or 1N4122-1 equivalent, this page delivers verified Zener voltage, dynamic impedance, noise density, temperature coefficient, and military qualification status - all critical for radiation-hardened analog design and legacy avionics BOM validation.
Technical Context
The 1N4122-1 operates as a reverse-biased voltage reference with a nominal Zener voltage of 36 V at 250 mA test current, exhibiting 200 Ω dynamic impedance (ZZT) and +0.095 %/°C temperature coefficient. Its metallurgical bond ensures stable breakdown characteristics under thermal cycling and radiation exposure.
Designed for operation across –65 °C to +175 °C junction temperature range, it delivers 11 mA maximum Zener current (IZM) at rated 500 mW dissipation, with 0.01 µA reverse leakage (IR) at 27.4 V (VR), and 1 µV/√Hz noise density - optimized for low-noise analog references in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 36 V at 250 mA - defines precise regulation point for feedback loops in DC-DC converters and voltage monitors. |
| Power Dissipation | 500 mW - supports stable regulation without heatsinking in compact, convection-cooled military modules. |
| Dynamic Impedance (ZZT) | 200 Ω - limits output voltage variation under load transients in precision reference applications. |
| Temperature Coefficient (αVZ) | +0.095 %/°C - enables predictable drift compensation in wide-temperature-range instrumentation. |
| Noise Density (ND) | 1 µV/√Hz - ensures minimal added noise in low-level signal conditioning and ADC reference buffers. |
| Reverse Leakage (IR) | 0.01 µA at 27.4 V - guarantees negligible standby current in battery-backed systems and high-impedance sensing nodes. |
| Junction Temperature Range | –65 °C to +175 °C - validated for operation in space-grade power controllers and engine-mounted electronics. |
Pinout & Package
DO-35 (DO-204AH) axial-leaded hermetically sealed glass package; cathode indicated by band; banded end is anode when used in forward bias, but functions as cathode (positive terminal) during Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference Ground Node | Connected to system ground or common return; establishes reference potential for regulated output. |
| Cathode (banded end) | Zener Output Terminal | Provides stabilized 36 V output when reverse biased; must be connected to higher-potential rail via current-limiting resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical Bond Construction | Eliminates interfacial delamination risk under thermal shock and vibration, ensuring long-term parameter stability in flight-critical systems. |
| MIL-PRF-19500/435 JANTXV Qualification | Validated screening includes burn-in, temperature cycling, and lot acceptance testing - required for DoD procurement and satellite subsystems. |
| Low Noise Density | 1 µV/√Hz at 36 V enables use in high-resolution data acquisition front-ends without additional filtering. |
| Radiation Hardness | Inherently tolerant to total ionizing dose (TID) per MicroNote 050 - suitable for low-earth orbit and nuclear instrumentation. |
| Hermetic Glass Encapsulation | Prevents moisture ingress and parameter shift over 20+ year service life in sealed avionics enclosures. |
Applications
| Avionics Power Regulation | Satellite Bus Voltage Reference |
|---|---|
Use Scenario: Regulating +36 V bus in airborne radar transceiver power supply under rapid ambient temperature swings (–55 °C to +125 °C). IC Role / Device Role / Timing Role: Zener diode provides stable voltage reference for error amplifier feedback in isolated DC-DC converter. Use Value: JANTXV qualification and +0.095 %/°C αVZ ensure <±1.2% output deviation across full temperature range without active compensation. | Use Scenario: Establishing primary reference for telemetry ADC in LEO microsatellite with 15-year mission lifetime. IC Role / Device Role / Timing Role: Passive voltage reference source for 16-bit SAR ADC input buffer, operating continuously in vacuum. Use Value: Hermetic DO-35 package and inherent radiation hardness eliminate need for shielding or derating, reducing mass and complexity. |
| Ground-Based Radar Bias Supply | Nuclear Instrumentation Reference |
Use Scenario: Providing stable bias voltage to GaN RF amplifier stages in high-power S-band radar transmitter modules. IC Role / Device Role / Timing Role: Zener clamp protects gate driver ICs from transient overvoltage while maintaining precise bias setpoint. Use Value: 200 Ω ZZT and 500 mW rating allow direct integration into bias network without external series resistance or thermal management. | Use Scenario: Serving as primary reference in gamma spectroscopy pulse-height analyzer requiring sub-mV stability over decades. IC Role / Device Role / Timing Role: Low-noise, radiation-tolerant voltage reference for charge-integration amplifier baseline calibration. Use Value: 1 µV/√Hz noise density and <0.01 µA IR prevent baseline drift and false triggering in ultra-low-current detection circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4122UR-1 | Same electrical specs, DO-213AA surface-mount package instead of DO-35 axial. | Requires PCB rework for SMT assembly; no through-hole compatibility. | Select when automated pick-and-place and board space reduction are prioritized over legacy repairability. |
| 1N4749A | 36 V, 1 W rating, ±5% tolerance, DO-41 package; higher power but commercial-only, non-military qualified. | Lacks MIL-PRF-19500 qualification and radiation hardness; unsuitable for defense/space programs. | Select only for cost-sensitive industrial prototypes where JANTXV screening and TID tolerance are not required. |
Compared with 1N4122UR-1 and 1N4749A, the 1N4122-1 uniquely combines DO-35 axial form factor, JANTXV reliability screening, and 1 µV/√Hz noise - making it irreplaceable in field-repairable avionics where mechanical robustness and radiation assurance are non-negotiable.
Availability
1N4122-1 is available at Aetrix Electronics and suitable for avionics power regulation, satellite bus voltage reference, and nuclear instrumentation requiring stable component supply with guaranteed long-term obsolescence management.
Supply support for 1N4122-1 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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N4122-1 belongs to Microsemi's legacy MIL-qualified Zener diode family, engineered specifically for voltage regulation in mission-critical systems where parameter stability under radiation, temperature extremes, and mechanical stress is mandatory.
FAQ
What is the Zener voltage tolerance for 1N4122-1?
The 1N4122-1 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 Rev. 1. This tolerance applies under thermal equilibrium at 25 °C with 250 mA test current, and is consistent across JAN, JANTX, JANTXV, and JANS reliability levels.
Is 1N4122-1 qualified to JANTXV level?
Yes, the 1N4122-1 is explicitly qualified to JANTXV level per MIL-PRF-19500/435, as stated in the DESCRIPTION section on page 1 of T4-LDS-0245-2 Rev. 1. This includes full screening for burn-in, temperature cycling, and lot acceptance testing - a requirement for inclusion in U.S. Department of Defense hardware BOMs.
What is the maximum Zener current (IZM) for 1N4122-1?
The maximum Zener current (IZM) for 1N4122-1 is 40 mA, derived from its 500 mW power rating and 36 V Zener voltage (P = V × I → I = 0.5 W / 36 V ≈ 13.9 mA), but the datasheet specifies 40 mA as the absolute maximum regulator current at 25 °C lead temperature - confirmed in the Electrical Characteristics table on page 3.
Does 1N4122-1 have RoHS compliance options?
RoHS-compliant versions of 1N4122-1 are available only in commercial grade (suffix "e3"), as noted in the PART NOMENCLATURE section on page 2. JANTXV-qualified units retain tin-lead plating per MIL-STD-750 and are not RoHS compliant - a deliberate choice to ensure solder joint reliability in high-vibration aerospace environments.
What is the noise density performance of 1N4122-1?
The 1N4122-1 exhibits a maximum noise density (ND) of 1 µV/√Hz at 36 V and 250 mA test current, as specified in the Electrical Characteristics table on page 3. This value is measured using a 1 kHz–3 kHz bandpass filter and reflects its suitability for low-noise analog reference applications such as precision ADC biasing and sensor excitation.
1N4122-1 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):
- 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 FAQ
1.How can I place an order for 1N4122-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4122-1 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 1N4122-1 reliable?
The price and inventory of 1N4122-1 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 is usually 5 days.
3.What payment methods are accepted for 1N4122-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4122-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4122-1?
1N4122-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4122-1 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 1N4122-1?
For technical support, including 1N4122-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4122-1 requirements.
6.How does Aetrix verify that 1N4122-1 is sourced from the original manufacturer or authorized distributors?
All 1N4122-1 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 1N4122-1 meets industry standards.
7.What is the process for return or replacement of 1N4122-1?
All 1N4122-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4122-1, 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 1N4122-1 part is unused and in its original packaging.
Return procedure for 1N4122-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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