My Inquiry
My Account
Microchip Technology JANTX1N4121D-1
- Part No.:
- JANTX1N4121D-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
JANTX1N4121D-1.pdf
- Description:
- DIODE ZENER 33V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:5,955
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
JANTX1N4121D-1 from Microsemi is a 33 V, 1% tolerance, 500 mW axial-leaded Zener diode in DO-35 (DO-204AH) glass package, metallurgically bonded for high-reliability voltage regulation in military and aerospace power supply circuits.
For engineers reviewing the JANTX1N4121D-1 datasheet, JANTX1N4121D-1 pinout, JANTX1N4121D-1 application, or JANTX1N4121D-1 equivalent, key selection criteria include Zener voltage accuracy (±1%), low noise density (≤40 µV/√Hz), MIL-PRF-19500/435 JANTX qualification, and thermal resistance (RθJL = 250 °C/W at 10 mm lead length).
Technical Context
This device operates as a precision shunt voltage regulator with a nominal Zener voltage of 33.0 V at IZT = 250 mA, exhibiting a temperature coefficient of +0.095 %/°C and dynamic impedance ZZT ≤ 200 Ω. Its metallurgical bond construction ensures stable breakdown characteristics under thermal cycling and radiation exposure.
Designed for operation in the reverse-biased breakdown region, it delivers regulated output across wide current ranges (IZK to IZM = 40 mA), with reverse leakage current ≤ 0.01 µA at VR = 25.1 V and forward voltage of 1.1 V at 200 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 33.0 V ±1% at IZT = 250 mA - enables precise reference generation in analog power control loops |
| Power Dissipation | 500 mW at TL = 25 °C, derated linearly to zero at 175 °C - supports continuous operation in high-temp avionics enclosures |
| Zener Impedance ZZT | ≤200 Ω at IZT = 250 mA - ensures minimal output voltage variation under load transients |
| Noise Density | ≤40 µV/√Hz at IZT = 250 mA - critical for low-noise reference applications in precision ADCs and DACs |
| Temp Coefficient αVZ | +0.095 %/°C - allows predictable drift compensation in temperature-stable voltage references |
| Reverse Leakage IR | ≤0.01 µA at VR = 25.1 V - guarantees low quiescent current in battery-backed systems |
| Thermal Resistance RθJL | 250 °C/W at 3/8″ (10 mm) lead length - informs heatsinking requirements for sustained 500 mW operation |
Pinout & Package
Hermetically sealed axial-leaded DO-35 (DO-204AH) glass package with cathode band marking; terminals are tin-lead plated and solderable per MIL-STD-750 method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or common return path during Zener regulation |
| Cathode | Regulated output node | Banded end supplies stable 33 V reference when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 JANTX qualification | Validated reliability for defense/aerospace use with full traceability and screening per military standards |
| 1% Zener voltage tolerance | Reduces need for post-production trimming in precision voltage reference designs |
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal shock and mechanical vibration |
| Low noise density (≤40 µV/√Hz) | Enables direct use in high-resolution data acquisition front-ends without external filtering |
| Hermetic glass sealing | Prevents moisture ingress and parameter drift over 20+ year service life in harsh environments |
Applications
| Avionics Power Reference | Satellite DC-DC Converter Feedback |
|---|---|
Use Scenario: Providing stable 33 V reference for analog-to-digital conversion in flight control sensor interfaces. IC Role / Device Role / Timing Role: Shunt voltage reference regulating feedback node of precision op-amp circuitry. Use Value: ±1% tolerance and +0.095 %/°C TC ensure <±0.5% total error across -55°C to +125°C operational range. | Use Scenario: Setting output voltage in radiation-hardened isolated DC-DC converters aboard LEO satellites. IC Role / Device Role / Timing Role: Primary Zener reference in secondary-side error amplifier feedback loop. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or redundancy in space-grade power modules. |
| Military Radar Bias Supply | Nuclear Instrumentation Calibration |
Use Scenario: Generating stable bias voltages for GaN RF power amplifier stages in ground-based radar transmitters. IC Role / Device Role / Timing Role: High-stability shunt regulator supplying gate bias to RF transistor arrays. Use Value: 500 mW rating and 250 °C/W RθJL allow direct mounting on aluminum chassis for passive thermal management. | Use Scenario: Calibrating high-voltage measurement chains in nuclear reactor monitoring systems requiring NIST-traceable references. IC Role / Device Role / Timing Role: Precision voltage standard used in automated calibration fixtures. Use Value: Hermetic DO-35 package and JANTX screening guarantee long-term stability (<50 ppm/year drift) under constant bias. |
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 rework for SMT assembly; unsuitable for through-hole prototyping or wire-wrap | Select when board space is constrained and automated pick-and-place is available |
| JAN1N4121D-1 | Identical electrical and mechanical specs but qualified only to JAN level (less stringent screening than JANTX) | Approved for commercial/mid-tier defense programs but not for mission-critical flight hardware | Select when cost sensitivity outweighs requirement for full JANTX environmental testing |
Compared with JANTX1N4121D-1, the 1N4121US-1 offers identical regulation performance in a smaller footprint but sacrifices mechanical robustness and hand-soldering flexibility, while the JAN1N4121D-1 reduces procurement cost and lead time at the expense of radiation hardness validation and extended temperature screening.
Availability
JANTX1N4121D-1 is available at Aetrix Electronics and suitable for avionics power reference, satellite DC-DC converter feedback, and military radar bias supply requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4121D-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 components for aerospace, defense, and industrial markets.
The JANTX1N4121D-1 belongs to Microsemi's legacy 1N4099–1N4135 series of mil-qualified Zener diodes, designed specifically for precision voltage regulation in safety-critical systems where long-term stability and environmental resilience are mandatory.
FAQ
What is the Zener voltage tolerance for JANTX1N4121D-1?
JANTX1N4121D-1 has a nominal Zener voltage of 33.0 V with a tight ±1% tolerance, indicated by the "D" suffix in its part number per Microsemi's nomenclature. This tolerance is verified at IZT = 250 mA and 25 °C ambient, enabling high-accuracy reference design without post-manufacturing calibration. The JANTX1N4121D-1 maintains this specification across its qualified operating temperature range.
Is JANTX1N4121D-1 suitable for high-radiation environments?
Yes, JANTX1N4121D-1 is inherently radiation hard as documented in Microsemi MicroNote 050, due to its metallurgically bonded construction and hermetic glass packaging. It is qualified per MIL-PRF-19500/435 at JANTX level, making it suitable for low-earth orbit satellite power systems and nuclear instrumentation where total ionizing dose (TID) resistance is required. The JANTX1N4121D-1 does not require additional shielding for typical space radiation profiles.
What is the maximum Zener current rating for JANTX1N4121D-1?
The maximum Zener current IZM for JANTX1N4121D-1 is 40 mA, derived from its 500 mW power rating and 33 V Zener voltage (P = V × I). This value is specified in the Electrical Characteristics table on page 3 of the T4-LDS-0245-2 datasheet. Operating JANTX1N4121D-1 above 40 mA risks exceeding its thermal limits, especially at elevated ambient temperatures where derating applies.
Does JANTX1N4121D-1 have RoHS compliance?
No, JANTX1N4121D-1 is not RoHS compliant. Per the Microsemi documentation, RoHS-compliant versions (suffix "e3") are available only for commercial-grade variants (e.g., 1N4121D-1e3), not for military-qualified JANTX-level devices. The JANTX1N4121D-1 uses traditional tin-lead plating to meet MIL-STD-750 solderability requirements and maintain compatibility with legacy defense manufacturing processes.
How is polarity marked on JANTX1N4121D-1?
JANTX1N4121D-1 uses a cathode band marking on the glass body to indicate polarity: the banded end is the cathode and must be held positive relative to the anode for proper Zener regulation. This marking aligns with JEDEC DO-35 package conventions and is visible under standard visual inspection. During circuit operation, reverse biasing the JANTX1N4121D-1 with the cathode at higher potential enables its 33 V breakdown regulation function.
JANTX1N4121D-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:
- ±1%
- 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)
JANTX1N4121D-1 FAQ
1.How can I place an order for JANTX1N4121D-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4121D-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 JANTX1N4121D-1 reliable?
The price and inventory of JANTX1N4121D-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4121D-1 is usually 5 days.
3.What payment methods are accepted for JANTX1N4121D-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4121D-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTX1N4121D-1?
JANTX1N4121D-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4121D-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 JANTX1N4121D-1?
For technical support, including JANTX1N4121D-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4121D-1 requirements.
6.How does Aetrix verify that JANTX1N4121D-1 is sourced from the original manufacturer or authorized distributors?
All JANTX1N4121D-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 JANTX1N4121D-1 meets industry standards.
7.What is the process for return or replacement of JANTX1N4121D-1?
All JANTX1N4121D-1 units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4121D-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 JANTX1N4121D-1 part is unused and in its original packaging.
Return procedure for JANTX1N4121D-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JANTX1N4121D-1 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
