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Microchip Technology JANS1N4121-1/TR
- Part No.:
- JANS1N4121-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
JANS1N4121-1/TR.pdf
- Description:
- DIODE ZENER 33V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:4,171
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Product details
Overview
JANS1N4121-1/TR from Microsemi is a 33 V, 500 mW 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 test current, and 0.01 µA maximum reverse leakage at 25.1 V. It delivers stable voltage regulation in high-reliability aerospace power conditioning circuits.
For engineers reviewing the JANS1N4121-1/TR datasheet, JANS1N4121-1/TR pinout, JANS1N4121-1/TR application, or JANS1N4121-1/TR equivalent, key selection criteria include military-grade reliability qualification, low-noise operation (≤1 µV/√Hz below 6.8 V), thermal resistance of 250 °C/W (junction-to-lead), and axial-leaded DO-35 mechanical compatibility for through-hole mounting in radiation-hardened systems.
Technical Context
This device operates as a precision shunt voltage regulator in reverse-biased breakdown mode, with cathode band marking polarity and specified Zener voltage (33.0 V) measured at IZT = 250 mA under thermal equilibrium at 25 °C. Its metallurgical bond construction ensures long-term stability under thermal cycling and radiation exposure.
The JANS1N4121-1/TR exhibits a positive temperature coefficient of +0.095 %/°C, enabling predictable drift compensation in wide-temperature-range designs. Maximum rated power dissipation is 500 mW at TC = 25 °C, linearly derated to zero at 175 °C junction temperature, with RθJL = 250 °C/W when mounted with 3/8″ lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 33.0 V at IZT = 250 mA - defines nominal regulation point for power supply reference design |
| Power Dissipation | 500 mW at 25 °C - sets maximum continuous DC power handling before thermal derating begins |
| Dynamic Impedance ZZT | 200 Ω at IZT = 250 mA - determines output voltage variation under load current changes |
| Reverse Leakage IR | 0.01 µA at VR = 25.1 V - ensures minimal quiescent current draw in standby regulation |
| Temp Coefficient αVZ | +0.095 %/°C - quantifies voltage drift over operating temperature range for accuracy budgeting |
| Noise Density ND | ≤1 µV/√Hz - enables low-noise analog reference use in precision instrumentation front-ends |
| Junction Temp Range | –65 to +175 °C - supports operation in extreme environmental conditions without derating loss |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed axial-leaded glass package with tin-lead or RoHS-compliant matte-tin plating; cathode indicated by single black band; weight ≈ 0.2 g; body diameter 1.42–2.29 mm, body length 3.56–5.08 mm, lead length 25.4–38.1 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to system ground or lower-potential rail during regulation; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener breakdown terminal / regulation output node | Banded end; connected to unregulated input; establishes regulated voltage at anode relative to this node |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 JANS qualification | Meets highest reliability screening for aerospace and defense applications including burn-in, life test, and radiation hardness verification |
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal shock and mechanical stress, ensuring long-term parameter stability |
| Low noise density ≤1 µV/√Hz | Enables use in low-noise analog references where spectral purity impacts ADC accuracy or sensor signal integrity |
| Hermetic glass DO-35 packaging | Provides moisture and contaminant immunity for >20-year field life in harsh environments without conformal coating |
| ESD robustness per MIL-STD-750 Method 1020 | Withstands ≥4 kV HBM without parameter shift, reducing handling sensitivity in production and field repair |
Applications
| Aerospace Power Conditioning | Defense System Reference Supplies |
|---|---|
Use Scenario: Regulating auxiliary 33 V bus in satellite power distribution units exposed to thermal cycling and total ionizing dose. IC Role / Device Role / Timing Role: Shunt voltage regulator maintaining stable bias for RF amplifiers and telemetry converters. Use Value: JANS-level qualification and radiation hardness ensure uninterrupted operation after 100 krad(Si) TID exposure. | Use Scenario: Providing precision 33 V reference in missile guidance inertial measurement unit (IMU) power subsystems. IC Role / Device Role / Timing Role: Primary voltage reference for analog-to-digital conversion of gyroscope and accelerometer signals. Use Value: Low 0.01 µA leakage and <200 Ω dynamic impedance maintain reference accuracy across –55 to +125 °C. |
| High-Reliability Industrial Control | Nuclear Instrumentation Front-Ends |
Use Scenario: Stabilizing 33 V supply for PLC analog I/O modules operating in oil refinery control cabinets. IC Role / Device Role / Timing Role: Zener clamp protecting ADC inputs and setting reference for 16-bit DAC outputs. Use Value: Hermetic DO-35 package prevents corrosion-induced failure in high-humidity, sulfur-laden atmospheres. | Use Scenario: Biasing photomultiplier tube (PMT) dynode chains in radiation detection spectrometers. IC Role / Device Role / Timing Role: High-voltage current source element delivering stable 33 V per dynode stage. Use Value: Minimal capacitance (<2 pF typical) avoids signal distortion in fast pulse-height analysis circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4121US-1 | Same electrical specs but in surface-mount DO-213AA package; no axial leads | Requires PCB redesign for SMT assembly; unsuitable for through-hole prototyping or legacy board rework | Select when automated placement and space-constrained layouts outweigh manual assembly flexibility |
| JANTXV1N4121-1 | Identical DO-35 package and electrical parameters; qualified to JANTXV level (lower screening rigor than JANS) | Approved for non-flight-critical avionics; not cleared for radiation-intensive missions or extended-life orbital deployment | Select for cost-sensitive defense programs where full JANS testing is not mandated by system specification |
Compared with JANS1N4121-1/TR, the 1N4121US-1 offers footprint reduction at the expense of mechanical serviceability, while JANTXV1N4121-1 trades radiation hardness and lifetime reliability for lower procurement cost and faster delivery-both require explicit validation against mission-critical environmental requirements.
Availability
JANS1N4121-1/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, defense system reference supplies, and high-reliability industrial control requiring stable component supply across extended product lifecycles and obsolescence-sensitive programs.
Supply support for JANS1N4121-1/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 aerospace, defense, and industrial markets.
The JANS1N4121-1/TR belongs to Microsemi's legacy MIL-PRF-19500/435 qualified Zener diode family, designed specifically for voltage regulation in mission-critical systems where parameter stability under radiation, thermal stress, and long-term aging is non-negotiable.
FAQ
What is the Zener voltage tolerance for JANS1N4121-1/TR?
The JANS1N4121-1/TR has a nominal Zener voltage of 33.0 V with a standard tolerance of ±5%, as defined by its JEDEC registration and MIL-PRF-19500/435 qualification. This tolerance applies under thermal equilibrium at 25 °C with IZT = 250 mA, and is verified during JANS-level screening. The JANS1N4121-1/TR does not offer tighter 2% or 1% tolerances-those are reserved for commercial-grade variants with different suffixes.
Is JANS1N4121-1/TR RoHS compliant?
No, the JANS1N4121-1/TR is not RoHS compliant. Per Microsemi documentation, RoHS compliance (e.g., annealed matte-tin plating) is available only on commercial-grade versions marked with the "e3" suffix (e.g., 1N4121-1e3). The JANS1N4121-1/TR uses traditional tin-lead plating to meet MIL-STD-750 solderability requirements and maintain legacy qualification integrity.
What is the maximum reverse leakage current for JANS1N4121-1/TR?
The maximum reverse leakage current (IR) for JANS1N4121-1/TR is 0.01 µA, measured at VR = 25.1 V (76% of nominal VZ). This value is guaranteed across the full qualified temperature range and verified during JANS-level environmental stress screening. The JANS1N4121-1/TR maintains this ultra-low leakage even after 1000-hour life test at 175 °C junction temperature.
Can JANS1N4121-1/TR be used in surface-mount designs?
No, JANS1N4121-1/TR is packaged exclusively in the axial-leaded DO-35 (DO-204AH) through-hole format. For surface-mount equivalents, Microsemi offers the 1N4121US-1 in DO-213AA package-but that part carries JANTXV qualification only and lacks JANS-level radiation hardness data. The JANS1N4121-1/TR itself cannot be adapted to SMT without carrier adapters or custom mounting hardware.
What is the thermal resistance junction-to-lead for JANS1N4121-1/TR?
The thermal resistance junction-to-lead (RθJL) for JANS1N4121-1/TR is 250 °C/W, measured with 3/8″ (10 mm) lead length from the package body. This value assumes standard mounting on FR4 PCB with 4 mm² copper pads and 1 mm track width. Derating follows a linear curve from 500 mW at 25 °C to zero at 175 °C junction temperature, as specified in Microsemi T4-LDS-0245-2.
JANS1N4121-1/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):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- 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 (TJ)
- Grade:
- Military
- Qualification:
- MIL-PRF-19500/435
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
JANS1N4121-1/TR FAQ
1.How can I place an order for JANS1N4121-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4121-1/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 JANS1N4121-1/TR reliable?
The price and inventory of JANS1N4121-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4121-1/TR is usually 5 days.
3.What payment methods are accepted for JANS1N4121-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANS1N4121-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANS1N4121-1/TR?
JANS1N4121-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANS1N4121-1/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 JANS1N4121-1/TR?
For technical support, including JANS1N4121-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4121-1/TR requirements.
6.How does Aetrix verify that JANS1N4121-1/TR is sourced from the original manufacturer or authorized distributors?
All JANS1N4121-1/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 JANS1N4121-1/TR meets industry standards.
7.What is the process for return or replacement of JANS1N4121-1/TR?
All JANS1N4121-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4121-1/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 JANS1N4121-1/TR part is unused and in its original packaging.
Return procedure for JANS1N4121-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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