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Microchip Technology JANS1N4120-1
- Part No.:
- JANS1N4120-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
JANS1N4120-1.pdf
- Description:
- DIODE ZENER 30V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:339
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Product details
Overview
JANS1N4120-1 from Microsemi is a 30.0 V, 500 mW metallurgically bonded glass Zener diode in DO-35 package, qualified to JANS level per MIL-PRF-19500/435 for high-reliability aerospace and defense applications. It delivers ±5% Zener voltage tolerance, 200 Ω dynamic impedance at 250 mA test current, and operates across –65 °C to +175 °C junction temperature range.
For engineers reviewing the JANS1N4120-1 datasheet, JANS1N4120-1 pinout, JANS1N4120-1 application, or JANS1N4120-1 equivalent, key selection factors include its radiation-hardened construction, low noise density (≤1 μV/√Hz below 6.8 V), stable temperature coefficient (+0.095 %/°C), and hermetic DO-35 axial-leaded packaging suitable for harsh-environment voltage regulation.
Technical Context
The JANS1N4120-1 functions as a precision shunt voltage regulator with metallurgical bonding ensuring long-term stability under thermal cycling and radiation exposure. Its Zener breakdown mechanism provides predictable reverse conduction at 30.0 V with 250 mA test current and 200 Ω dynamic impedance.
It exhibits a positive temperature coefficient of +0.095 %/°C, enabling predictable voltage drift over temperature, and supports operation up to 175 °C junction temperature with 300 °C/W junction-to-ambient thermal resistance on standard FR4 board layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 30.0 V at 250 mA - precise reference point for regulated output in power supply feedback or voltage clamp circuits |
| Power Dissipation | 500 mW at 25 °C - defines maximum continuous DC power handling before thermal derating begins at 50 °C |
| Zener Impedance ZZT | 200 Ω at 250 mA - determines regulation accuracy under varying load current; lower values improve line/load regulation |
| Reverse Leakage IR | ≤0.01 µA at 22.8 V - ensures minimal parasitic current draw in high-impedance bias networks |
| Temperature Coefficient αVZ | +0.095 %/°C - quantifies voltage drift per degree Celsius, critical for wide-temperature-range instrumentation |
| Noise Density | ≤1 µV/√Hz - enables use in low-noise analog references where broadband voltage noise must be minimized |
| Junction Temperature Range | –65 °C to +175 °C - supports operation in extreme environments including space, avionics, and downhole systems |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed axial-leaded glass package with cathode indicated by band; banded end is positive during Zener regulation. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or lowest potential point; forms return path for Zener current |
| Cathode | Regulated output node | Banded end; supplies stable 30.0 V reference when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 JANS qualification | Guarantees screening, testing, and traceability for space-grade reliability and radiation hardness |
| Metallurgical bond construction | Prevents interfacial degradation under thermal shock and prolonged high-temperature operation |
| Hermetic DO-35 glass package | Eliminates moisture ingress and parameter drift in humid or corrosive atmospheres |
| Low noise density ≤1 µV/√Hz | Enables direct use in precision analog references without external filtering |
| Non-ESD-sensitive design | Withstands electrostatic discharge per MIL-STD-750 method 1020 without parameter shift or failure |
Applications
| Avionics Power Monitoring | Satellite Voltage Reference |
|---|---|
Use Scenario: Monitoring 28 V DC bus voltage in flight control computers using resistor-divider + comparator architecture. IC Role / Device Role / Timing Role: Provides stable 30.0 V Zener reference for comparator threshold setting against scaled bus voltage. Use Value: Maintains reference accuracy across –55 °C to +125 °C operating range with <±0.5% total drift, enabling reliable undervoltage/overvoltage detection. | Use Scenario: Generating primary voltage reference for ADCs and DACs in LEO satellite telemetry subsystems. IC Role / Device Role / Timing Role: Serves as shunt-regulated reference source feeding precision op-amp buffer stages. Use Value: Radiation-hardened construction ensures no parametric shift after 100 krad(Si) TID exposure, preserving measurement integrity over mission lifetime. |
| Nuclear Instrumentation | Downhole Oilfield Sensors |
Use Scenario: Biasing photomultiplier tube (PMT) anode chains in gamma spectroscopy detectors. IC Role / Device Role / Timing Role: Supplies stable high-voltage bias rail via series resistor, regulating against supply ripple and temperature drift. Use Value: Low noise density (<1 µV/√Hz) prevents signal corruption in ultra-low-current pulse detection circuits. | Use Scenario: Providing reference voltage for pressure/temperature sensor signal conditioning in oil well logging tools. IC Role / Device Role / Timing Role: Acts as temperature-stable shunt regulator in 175 °C rated front-end circuitry. Use Value: Guaranteed operation up to +175 °C junction temperature eliminates need for active cooling or derating in sealed probe housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4120US (Microchip) | Same 30.0 V nominal Zener voltage, but commercial-grade DO-213AA surface-mount package; no MIL-qualification | Lacks JANS screening, radiation hardness, and extended temperature validation; unsuitable for space or nuclear use | Select only for cost-sensitive terrestrial industrial designs where MIL-spec is not required |
| JANTXV1N4120 (Microsemi) | Identical electrical specs and DO-35 package, but qualified only to JANTXV level (not JANS); lower screening rigor and no radiation test data | Approved for high-reliability military ground systems but excluded from flight-critical or space programs requiring JANS | Use when full JANS qualification is unnecessary but enhanced reliability beyond commercial grade is needed |
Compared with JANS1N4120-1, the JANTXV1N4120 offers identical regulation performance with reduced screening depth and no radiation assurance, while the 1N4120US trades hermeticity and reliability for surface-mount compatibility and lower cost-neither is a drop-in replacement for JANS-level requirements.
Availability
JANS1N4120-1 is available at Aetrix Electronics and suitable for avionics power monitoring, satellite voltage reference, and nuclear instrumentation requiring stable component supply with full traceability and long-lifecycle support.
Supply support for JANS1N4120-1 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 analog and mixed-signal ICs, RF solutions, and radiation-hardened components.
The JANS1N4120-1 belongs to Microsemi's legacy MIL-PRF-19500/435 qualified Zener diode family, designed specifically for voltage regulation in mission-critical aerospace, defense, and nuclear systems where parameter stability under extreme stress is mandatory.
FAQ
What is the Zener voltage tolerance of JANS1N4120-1?
JANS1N4120-1 has a nominal Zener voltage of 30.0 V with a ±5% tolerance, as defined by JEDEC standard for the 1N4099–1N4135 series. This tolerance applies at 25 °C with the device in thermal equilibrium and is verified during JANS-level screening per MIL-PRF-19500/435.
Is JANS1N4120-1 radiation hardened?
Yes, JANS1N4120-1 is inherently radiation hard as documented in Microsemi MicroNote 050. Its metallurgically bonded structure and hermetic DO-35 package provide proven resilience to total ionizing dose (TID) and single-event effects, making it suitable for space and nuclear applications without additional shielding.
What is the maximum operating temperature for JANS1N4120-1?
JANS1N4120-1 supports a junction temperature range of –65 °C to +175 °C. This rating is validated through JANS-level environmental stress screening and allows deployment in downhole, avionics, and space platforms where ambient temperatures exceed commercial limits.
Does JANS1N4120-1 have low noise characteristics?
Yes, JANS1N4120-1 exhibits ≤1 µV/√Hz noise density at its 30.0 V Zener voltage, consistent with the family's specification for voltages ≥6.8 V. This low broadband noise enables direct use in precision analog references without external filtering in sensitive instrumentation circuits.
How is polarity marked on JANS1N4120-1?
JANS1N4120-1 uses a cathode band marking on the glass body to indicate polarity. During Zener regulation, the banded end (cathode) must be held positive relative to the unmarked end (anode). This marking is visible, permanent, and compliant with MIL-STD-883 requirements for military-grade devices.
JANS1N4120-1 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):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 22.8 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)
JANS1N4120-1 FAQ
1.How can I place an order for JANS1N4120-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4120-1 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 JANS1N4120-1 reliable?
The price and inventory of JANS1N4120-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4120-1 is usually 5 days.
3.What payment methods are accepted for JANS1N4120-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANS1N4120-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANS1N4120-1?
JANS1N4120-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANS1N4120-1 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 JANS1N4120-1?
For technical support, including JANS1N4120-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4120-1 requirements.
6.How does Aetrix verify that JANS1N4120-1 is sourced from the original manufacturer or authorized distributors?
All JANS1N4120-1 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 JANS1N4120-1 meets industry standards.
7.What is the process for return or replacement of JANS1N4120-1?
All JANS1N4120-1 units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4120-1, 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 JANS1N4120-1 part is unused and in its original packaging.
Return procedure for JANS1N4120-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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