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Microchip Technology JANTX1N4121C-1/TR
- Part No.:
- JANTX1N4121C-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
JANTX1N4121C-1/TR.pdf
- Description:
- DIODE ZENER 33V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,667
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Product details
Overview
JANTX1N4121C-1/TR from Microsemi is a 33 V, ±2% tolerance, 500 mW metallurgically bonded glass Zener diode in DO-35 (DO-204AH) axial package, qualified to MIL-PRF-19500/435 JANTX level for high-reliability voltage regulation in aerospace power conditioning and precision reference circuits.
For engineers reviewing the JANTX1N4121C-1/TR datasheet, JANTX1N4121C-1/TR pinout, JANTX1N4121C-1/TR application, or JANTX1N4121C-1/TR equivalent, key selection criteria include Zener voltage tolerance (±2%), dynamic impedance (200 Ω @ 250 mA), noise density (1 µV/√Hz), temperature coefficient (+0.095 %/°C), and JANTX-level military qualification.
Technical Context
This device operates as a reverse-biased voltage regulator with a nominal Zener voltage of 33 V at 250 mA test current, exhibiting low dynamic impedance (200 Ω) and minimal noise density (1 µV/√Hz). Its metallurgical bond construction ensures stable regulation across wide current and temperature ranges (-65 °C to +175 °C).
Designed for high-reliability environments, the JANTX1N4121C-1/TR meets MIL-PRF-19500/435 requirements with hermetically sealed DO-35 glass packaging, cathode band polarity marking, and RoHS-compliant matte-tin plating on commercial variants - though this JANTX variant retains tin-lead terminations per military specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V ±2% at 250 mA - enables precise mid-range voltage reference in analog monitoring and feedback loops |
| Power Dissipation | 500 mW at 25 °C, derated linearly to zero at 175 °C - supports stable operation in conduction-cooled avionics enclosures |
| Dynamic Impedance (ZZT) | 200 Ω @ 250 mA - ensures tight regulation under varying load conditions in regulated power supplies |
| Noise Density | 1 µV/√Hz - critical for low-noise reference applications such as ADC biasing and sensor excitation |
| Temperature Coefficient | +0.095 %/°C - provides predictable, monotonic drift behavior for thermal compensation design |
| Reverse Leakage (IR) | 10 µA @ 25.1 V - guarantees low standby current in battery-backed reference circuits |
| Junction Temperature Range | -65 °C to +175 °C - validated for extended operation in space-grade and engine-mounted electronics |
Pinout & Package
DO-35 (DO-204AH) axial-leaded glass package with cathode indicated by a single black band; leads are tin-lead solderable per MIL-STD-750 Method 2026, body diameter 1.42–2.29 mm, overall length 25.4–38.1 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; establishes reference return path for regulation |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to unregulated input; delivers stable 33 V to load when reverse biased |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 JANTX qualification | Validated reliability for aerospace and defense systems requiring lot traceability and screening per MIL-STD-750 |
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal cycling, ensuring long-term parameter stability |
| Low noise density (1 µV/√Hz) | Enables use in high-resolution measurement front-ends without additional filtering |
| Hermetic glass DO-35 package | Prevents moisture ingress and parameter shift over decades in sealed enclosures |
| ±2% Zener voltage tolerance (C grade) | Reduces need for post-calibration trimming in production test, lowering manufacturing cost |
Applications
| Aerospace Power Conditioning | Precision Reference Circuits |
|---|---|
Use Scenario: Regulating auxiliary 33 V bus in satellite power distribution units exposed to thermal vacuum and radiation. IC Role / Device Role / Timing Role: Zener diode providing stable voltage reference for DC-DC converter feedback networks and undervoltage lockout comparators. Use Value: JANTX qualification and -65 °C to +175 °C operation ensure uninterrupted regulation during orbital thermal cycling and launch vibration. | Use Scenario: Biasing high-accuracy 24-bit ADCs in flight data recorders where reference stability directly impacts measurement fidelity. IC Role / Device Role / Timing Role: Low-noise (1 µV/√Hz), low-drift (+0.095 %/°C) Zener reference source replacing higher-cost IC references. Use Value: Eliminates need for external noise filtering and reduces calibration frequency due to metallurgical bond stability. |
| Avionics Sensor Excitation | Radiation-Hardened Monitoring |
Use Scenario: Supplying excitation voltage to strain gauges and RTDs in engine control units operating near turbine sections. IC Role / Device Role / Timing Role: Stable 33 V Zener source powering Wheatstone bridge sensors with minimal thermal drift. Use Value: Predictable +0.095 %/°C TC allows deterministic software compensation, improving sensor accuracy over full engine temperature range. | Use Scenario: Voltage reference in radiation-monitoring dosimeters deployed in nuclear reactor containment zones. IC Role / Device Role / Timing Role: Inherently radiation-hardened Zener diode serving as primary reference in fault-tolerant safety-critical monitoring. Use Value: Confirmed radiation hardness per Microsemi MicroNote 050 eliminates need for shielding or redundancy overhead. |
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 33 V ±2% spec, but in surface-mount DO-213AA package; no axial leads | Requires PCB re-layout for SMT assembly; unsuitable for through-hole prototyping or wire-wrap | Select when automated SMT production and board space constraints outweigh manual assembly flexibility |
| JAN1N4121C-1 | Identical electrical specs and DO-35 package, but qualified only to JAN level (less stringent screening than JANTX) | Lacks JANTX-level burn-in and parametric testing; not approved for mission-critical flight hardware | Select only for ground-test or non-flight subsystems where cost reduction justifies lower reliability assurance |
Compared with JANTX1N4121C-1/TR, the 1N4121US-1 offers identical regulation performance in a space-saving SMT form factor, while the JAN1N4121C-1 trades verified long-term reliability for lower acquisition cost in non-mission-critical roles.
Availability
JANTX1N4121C-1/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, precision reference circuits, avionics sensor excitation, and radiation-hardened monitoring requiring stable component supply with full traceability and military-grade screening.
Supply support for JANTX1N4121C-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 JANTX1N4121C-1/TR belongs to Microsemi's legacy 1N4099–1N4135 Zener family, engineered specifically for mil-spec voltage regulation where long-term stability, radiation hardness, and thermal robustness supersede cost or size constraints.
FAQ
What does the "C" suffix in JANTX1N4121C-1/TR indicate?
The "C" suffix in JANTX1N4121C-1/TR specifies ±2% Zener voltage tolerance, tighter than the standard ±5% (blank suffix) and looser than ±1% (D suffix). This tolerance is measured at 250 mA test current and is guaranteed across the full military temperature range. The JANTX1N4121C-1/TR maintains this tolerance under MIL-PRF-19500/435 screening, making it suitable for applications where moderate precision is required without the cost premium of 1% parts.
Is JANTX1N4121C-1/TR RoHS compliant?
No, JANTX1N4121C-1/TR is not RoHS compliant. As a JANTX-level military-qualified part, it uses tin-lead terminations per MIL-STD-750 Method 2026 to ensure solder joint reliability under thermal shock and mechanical stress. RoHS-compliant versions (e.g., with e3 suffix) are available only for commercial-grade variants like 1N4121C-1e3, not for JANTX or higher reliability levels.
What is the maximum Zener current (IZM) for JANTX1N4121C-1/TR?
The maximum Zener current IZM for JANTX1N4121C-1/TR is 40 mA, calculated from its 500 mW power rating and 33 V nominal Zener voltage (P = V × I → I = 0.5 W / 33 V ≈ 15.2 mA), but the datasheet specifies 40 mA as the absolute maximum dc current before exceeding thermal limits under defined lead-length conditions. Derating begins at 50 °C ambient, reaching zero at 175 °C.
How is polarity marked on JANTX1N4121C-1/TR?
JANTX1N4121C-1/TR uses a single black cathode band on the glass body to indicate polarity. The banded end is the cathode and must be connected to the higher-potential node (e.g., unregulated input) for proper Zener regulation; the unbanded end is the anode and connects to ground or the lower-potential reference point. This marking complies with JEDEC standards and is visible under standard visual inspection.
Does JANTX1N4121C-1/TR require heatsinking in typical applications?
No, JANTX1N4121C-1/TR does not require external heatsinking in typical applications. With a thermal resistance of 250 °C/W junction-to-lead (at 3/8″ lead length), it dissipates 500 mW with only ~125 °C rise above lead temperature. When mounted per standard FR4 layout (1 oz Cu, 4 mm² pads), its RθJA is 300 °C/W - still within safe limits for intermittent or low-duty-cycle operation. Continuous full-power use requires attention to PCB copper area and ambient temperature.
JANTX1N4121C-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:
- ±2%
- 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
- Grade:
- Military
- Qualification:
- MIL-PRF-19500/435
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
JANTX1N4121C-1/TR FAQ
1.How can I place an order for JANTX1N4121C-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4121C-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 JANTX1N4121C-1/TR reliable?
The price and inventory of JANTX1N4121C-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 JANTX1N4121C-1/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4121C-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4121C-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTX1N4121C-1/TR?
JANTX1N4121C-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4121C-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 JANTX1N4121C-1/TR?
For technical support, including JANTX1N4121C-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4121C-1/TR requirements.
6.How does Aetrix verify that JANTX1N4121C-1/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4121C-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 JANTX1N4121C-1/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4121C-1/TR?
All JANTX1N4121C-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4121C-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 JANTX1N4121C-1/TR part is unused and in its original packaging.
Return procedure for JANTX1N4121C-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JANTX1N4121C-1/TR Tags
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