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Microchip Technology JAN1N4121-1
- Part No.:
- JAN1N4121-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
JAN1N4121-1.pdf
- Description:
- DIODE ZENER 33V DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:2,157
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Product details
Overview
JAN1N4121-1 from Microsemi is a 500 mW, 33 V metallurgically bonded glass Zener diode in DO-35 package, qualified to JANS level per MIL-PRF-19500/435, with ±5% voltage tolerance, 200 Ω dynamic impedance at 250 mA, and max reverse current of 10 µA at 25.1 V. It serves as a precision voltage reference in radiation-hardened military power regulation circuits.
For engineers reviewing the JAN1N4121-1 datasheet, JAN1N4121-1 pinout, JAN1N4121-1 application, or JAN1N4121-1 equivalent, key selection criteria include Zener voltage stability over temperature (αVZ = +0.095 %/°C), low noise density (≤1 µV/√Hz below 6.8 V), hermetic DO-35 packaging, and JANS-level reliability for high-reliability aerospace and defense systems.
Technical Context
This device operates in reverse breakdown with cathode-banded polarity, requiring the banded end to be held positive relative to the anode for regulation. Its metallurgical bond ensures stable junction characteristics under thermal cycling and radiation exposure.
The 33 V nominal Zener voltage is specified at IZT = 250 mA with ZZT ≤ 200 Ω, and it exhibits linear power derating from 500 mW at 25 °C to zero at 175 °C ambient, with RθJA = 300 °C/W on FR4 board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 33.0 V at 250 mA test current - defines precise regulation point for feedback loops |
| Power Dissipation | 500 mW at 25 °C - supports stable operation in compact axial-leaded designs without forced cooling |
| Zener Impedance ZZT | ≤200 Ω at 250 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage IR | ≤10 µA at 25.1 V - guarantees low quiescent current in standby power rails |
| Temp Coefficient αVZ | +0.095 %/°C - enables predictable drift compensation in wide-temperature military environments |
| Noise Density ND | ≤1 µV/√Hz - critical for low-noise analog references in precision instrumentation |
| Package | DO-35 (DO-204AH) - hermetically sealed glass axial package qualified for JANS-level reliability |
Pinout & Package
DO-35 (DO-204AH) glass axial package with hermetically sealed construction, tin-lead or RoHS-compliant matte-tin plating, cathode indicated by band. Weight ≈ 0.2 g; lead length 25.4–38.1 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; must be at lower potential than cathode during regulation |
| Cathode (banded end) | Zener regulation output | Held positive relative to anode; delivers stable 33 V reference under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Ensures long-term parameter stability under thermal stress and radiation exposure |
| JANS qualification per MIL-PRF-19500/435 | Validated for space-grade and nuclear-hardened applications with full lot traceability |
| Low noise density (≤1 µV/√Hz) | Enables use in high-resolution ADC references and precision op-amp bias networks |
| Hermetic glass DO-35 package | Prevents moisture ingress and parameter shift in humid or corrosive operational environments |
| Non-ESD-sensitive per MIL-STD-750 Method 1020 | Eliminates need for ESD handling protocols during manual assembly or field repair |
Applications
| Military Power Supply Reference | Aerospace Voltage Monitor |
|---|---|
Use Scenario: Regulating 33 V reference in airborne radar power conditioning modules operating from -55 °C to +125 °C. IC Role / Device Role / Timing Role: Zener diode providing primary voltage reference for error amplifiers in isolated DC-DC converters. Use Value: JANS qualification and +0.095 %/°C tempco ensure stable regulation across extreme thermal cycles without recalibration. | Use Scenario: Monitoring bus voltage integrity in satellite command-and-data-handling subsystems exposed to total ionizing dose >100 krad(Si). IC Role / Device Role / Timing Role: Radiation-hardened voltage clamp protecting ADC input stages from overvoltage events. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or redundancy in LEO missions. |
| Defense Avionics Bias Network | Nuclear Instrumentation Reference |
Use Scenario: Generating stable bias points for RF front-end LNAs in electronic warfare receivers deployed in jet engine bays. IC Role / Device Role / Timing Role: Low-noise (≤1 µV/√Hz) Zener reference for active bias control loops. Use Value: Minimal broadband noise prevents degradation of receiver noise figure in sensitive HF/VHF bands. | Use Scenario: Providing calibration reference in portable radiation survey meters used in reactor containment zones. IC Role / Device Role / Timing Role: Primary voltage standard for analog-to-digital conversion of pulse-height spectra. Use Value: Hermetic DO-35 package withstands high-humidity, high-radiation environments where plastic packages fail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4121US | Same 33 V Zener voltage, but in surface-mount DO-213AA package; no JANS qualification | Lacks radiation hardness and hermetic sealing; suitable only for commercial PCB space-constrained designs | Select when automated SMT assembly is required and radiation/military specs are not needed |
| JANTXV1N4121 | Identical electrical specs and DO-35 package, but qualified only to JANTXV level (not JANS); higher screening cost | Meets most military ground systems but excluded from flight-critical avionics due to missing neutron irradiation testing | Select when full JANS is unnecessary but enhanced screening beyond JAN is required |
Compared with JAN1N4121-1, 1N4121US trades hermetic reliability for SMT compatibility, while JANTXV1N4121 offers intermediate screening-neither provides the full JANS radiation assurance or guaranteed 175 °C junction rating of JAN1N4121-1.
Availability
JAN1N4121-1 is available at Aetrix Electronics and suitable for military power supplies, aerospace voltage monitors, and nuclear instrumentation requiring stable component supply with full traceability and extended temperature support.
Supply support for JAN1N4121-1 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) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and aerospace-grade components.
The JAN1N4121-1 belongs to Microsemi's legacy MIL-PRF-19500/435 qualified Zener diode family, designed specifically for voltage regulation in mission-critical defense, space, and nuclear systems where parameter stability under extreme environmental stress is non-negotiable.
FAQ
What is the Zener voltage tolerance for JAN1N4121-1?
JAN1N4121-1 has a nominal Zener voltage of 33.0 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. This tolerance applies under thermal equilibrium at 25 °C with IZT = 250 mA.
Is JAN1N4121-1 suitable for radiation-hardened applications?
Yes, JAN1N4121-1 is inherently radiation hard per Microsemi MicroNote 050 and qualified to JANS level per MIL-PRF-19500/435, making it suitable for high-total-ionizing-dose environments such as satellites and nuclear instrumentation where JAN1N4121-1 maintains regulation stability after exposure.
What is the maximum power dissipation of JAN1N4121-1 at 70 °C ambient?
At 70 °C ambient, JAN1N4121-1's rated average power dissipation is linearly derated from 500 mW at 25 °C to zero at 175 °C. Using the derating curve in Figure 2, power capability at 70 °C is approximately 333 mW - calculated as 500 mW × (1 − (70−25)/150).
Does JAN1N4121-1 have RoHS-compliant variants?
No - JAN1N4121-1 is a JANS-level military part and therefore not offered in RoHS-compliant versions. RoHS compliance (e3 suffix) is available only on commercial-grade variants like 1N4121-1e3, which lack MIL-specification screening and radiation hardness.
What is the cathode identification method for JAN1N4121-1?
JAN1N4121-1 uses a visible cathode band on the glass DO-35 body to identify the cathode terminal; the banded end must be held positive relative to the unbanded (anode) end during Zener regulation, as explicitly stated in the Mechanical and Packaging section on page 2 of the datasheet.
JAN1N4121-1 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):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- -
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 25.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- Military
- Qualification:
- MIL-PRF-19500/435
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
JAN1N4121-1 FAQ
1.How can I place an order for JAN1N4121-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for JAN1N4121-1 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 JAN1N4121-1 reliable?
The price and inventory of JAN1N4121-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JAN1N4121-1 is usually 5 days.
3.What payment methods are accepted for JAN1N4121-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JAN1N4121-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JAN1N4121-1?
JAN1N4121-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JAN1N4121-1 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 JAN1N4121-1?
For technical support, including JAN1N4121-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JAN1N4121-1 requirements.
6.How does Aetrix verify that JAN1N4121-1 is sourced from the original manufacturer or authorized distributors?
All JAN1N4121-1 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 JAN1N4121-1 meets industry standards.
7.What is the process for return or replacement of JAN1N4121-1?
All JAN1N4121-1 units undergo pre-shipment inspection (PSI). If there is an issue with JAN1N4121-1, 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 JAN1N4121-1 part is unused and in its original packaging.
Return procedure for JAN1N4121-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JAN1N4121-1 Tags
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