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Microchip Technology JANTX1N4121-1/TR
- Part No.:
- JANTX1N4121-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
JANTX1N4121-1/TR.pdf
- Description:
- DIODE ZENER 33V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:9,014
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Product details
Overview
JANTX1N4121-1/TR from Microsemi is a 33 V, 500 mW axial-leaded glass Zener diode in DO-35 (DO-204AH) package, qualified to JANTX level per MIL-PRF-19500/435, with ±5% Zener voltage tolerance, 200 Ω dynamic impedance at 250 mA test current, and 0.01 µA maximum reverse leakage at 25.1 V.
For engineers reviewing the JANTX1N4121-1/TR datasheet, JANTX1N4121-1/TR pinout, JANTX1N4121-1/TR application, or JANTX1N4121-1/TR equivalent, this page delivers verified military-grade Zener regulation specs, thermal derating behavior, noise density, temperature coefficient, and RoHS-compliant packaging options for high-reliability analog reference and power-supply feedback designs.
Technical Context
This device operates as a precision voltage reference in reverse-biased breakdown mode, delivering stable 33 V regulation across 250 mA test current and up to 40 mA maximum Zener current. Its metallurgically bonded construction ensures low noise (≤1 µV/√Hz below 6.8 V), minimal capacitance (~1.5 pF), and radiation hardness per MicroNote 050.
Designed for operation within -65 °C to +175 °C junction temperature range, it features 250 °C/W junction-to-lead thermal resistance with 3/8″ lead length and linear power derating from 500 mW at 25 °C to zero at 175 °C - critical for aerospace and defense thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 33.0 V at 250 mA test current - defines nominal regulation point for feedback loops and reference circuits |
| Power Dissipation | 500 mW at 25 °C lead temperature - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance ZZT | 200 Ω at 250 mA - determines output impedance and load regulation sensitivity in shunt regulator topologies |
| Reverse Leakage IR | 0.01 µA at 25.1 V - ensures minimal error current in high-impedance bias networks |
| Temp. Coefficient αVZ | +0.095 %/°C - quantifies voltage drift over temperature; enables compensation in precision references |
| Noise Density ND | ≤1 µV/√Hz - supports low-noise analog signal conditioning and metrology-grade references |
| Junction Temp. Range | -65 °C to +175 °C - qualifies for extended-environment military, avionics, and space applications |
Pinout & Package
Hermetically sealed axial-leaded glass DO-35 (DO-204AH) package with cathode band marking; tin-lead or RoHS-compliant matte-tin plating; 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 | Reference ground node | Connected to system ground or lower-potential rail; forms return path for Zener current |
| Cathode | Regulated output node | Banded end; supplies stable 33 V when reverse-biased; connects to feedback input or reference point |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 JANTX qualification | Validated reliability for defense/aerospace programs requiring screening, lot traceability, and burn-in |
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal cycling and mechanical shock |
| Low noise density ≤1 µV/√Hz | Enables use in precision instrumentation amplifiers and ADC reference buffers without added filtering |
| Hermetic glass sealing | Prevents moisture ingress and long-term parameter drift in humid or corrosive environments |
| Non-ESD-sensitive per MIL-STD-750 Method 1020 | Allows safe handling without special ESD controls during assembly and test |
Applications
| Avionics Power Monitoring | Satellite Bus Voltage Reference |
|---|---|
Use Scenario: Monitoring 28 V DC bus voltage in flight control computers using resistive divider + comparator. IC Role / Device Role / Timing Role: Zener reference diode providing stable 33 V threshold for overvoltage detection circuitry. Use Value: JANTX1N4121-1/TR's +0.095 %/°C tempco and -65 °C to +175 °C rating ensure consistent trip point across extreme ambient conditions. | Use Scenario: Generating precision bias voltage for radiation-hardened op-amps in payload telemetry interfaces. IC Role / Device Role / Timing Role: Shunt reference supplying regulated 33 V to analog front-end circuitry. Use Value: Metallurgical bond and hermetic DO-35 package deliver proven radiation hardness and long-term stability in LEO orbit environments. |
| Ground-Based Radar Bias Supply | Tactical Radio RF Power Amplifier Feedback |
Use Scenario: Providing stable bias to GaN HEMT gate drivers in S-band radar transmitters. IC Role / Device Role / Timing Role: Zener clamp regulating gate voltage against transient spikes during pulsed operation. Use Value: 500 mW power rating and 200 Ω ZZT enable robust clamping without thermal runaway under repetitive 100 ns pulses. | Use Scenario: Setting gain control reference in adaptive RF power amplifier feedback loop. IC Role / Device Role / Timing Role: Precision voltage reference defining setpoint for closed-loop output power regulation. Use Value: ≤1 µV/√Hz noise density prevents AM sideband degradation in narrowband HF/VHF comms channels. |
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 DO-213AA surface-mount package; no axial leads | Required for automated SMT assembly; unsuitable for through-hole prototyping or high-vibration mechanical retention | Select when board space is constrained and reflow compatibility is mandatory |
| JANS1N4121-1 | Identical electrical and thermal specs, but qualified to JANS level with full lot acceptance testing and radiation assurance data | Necessary for Class-S spaceflight hardware where single-event burnout (SEB) immunity must be documented | Select when mission-critical radiation tolerance and full MIL-PRF-19500/435 JANS compliance are contractually required |
Compared with JANTX1N4121-1/TR, the 1N4121US-1 offers identical regulation performance in a compact SMT form factor, while JANS1N4121-1 adds radiation assurance and extended screening - making JANTX1N4121-1/TR the optimal balance of military reliability, cost, and availability for non-space defense systems.
Availability
JANTX1N4121-1/TR is available at Aetrix Electronics and suitable for avionics power monitoring, satellite bus voltage reference, and ground-based radar bias supply requiring stable component supply, full traceability, and MIL-spec conformance.
Supply support for JANTX1N4121-1/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, RF, and radiation-hardened components for defense, aerospace, and industrial markets.
The JANTX1N4121-1/TR belongs to Microsemi's legacy 1N4099–1N4135 Zener family, engineered specifically for military-grade voltage regulation where long-term stability, thermal resilience, and hermetic integrity are non-negotiable.
FAQ
What is the Zener voltage tolerance for JANTX1N4121-1/TR?
JANTX1N4121-1/TR has a nominal Zener voltage of 33.0 V with a standard tolerance of ±5%, as defined by its JAN/JANTX nomenclature and JEDEC registration. This tolerance applies at 25 °C with the diode in thermal equilibrium and is consistent across all reliability levels in the 1N4099–1N4135 series unless otherwise marked with C (±2%) or D (±1%) suffixes - which JANTX1N4121-1/TR does not carry.
Is JANTX1N4121-1/TR RoHS compliant?
JANTX1N4121-1/TR is not RoHS compliant. Per the manufacturer's documentation, RoHS-compliant versions (marked with "e3" suffix) are available only on commercial-grade parts, not on JAN, JANTX, JANTXV, or JANS qualified devices. The JANTX1N4121-1/TR uses traditional tin-lead plating per MIL-STD-750 and retains lead content for solderability and reliability in high-reliability applications.
What is the maximum Zener current IZM for JANTX1N4121-1/TR?
The maximum Zener current IZM for JANTX1N4121-1/TR is 40 mA, derived from its 500 mW power rating and 33 V Zener voltage (P = V × I → I = 0.5 W / 33 V ≈ 15.2 mA), but the datasheet explicitly lists IZM = 40 mA in the Electrical Characteristics table - indicating it is rated for short-duration or pulsed operation beyond steady-state thermal limits, provided lead temperature remains within specification.
Does JANTX1N4121-1/TR require heatsinking?
JANTX1N4121-1/TR does not require external heatsinking for typical operation at ≤500 mW and ≤25 °C ambient, due to its 250 °C/W junction-to-lead thermal resistance with 3/8″ lead length. However, in enclosed or high-ambient-temperature environments (>50 °C), thermal derating must be applied linearly to zero power at 175 °C - meaning heatsinking or PCB copper pour may be needed to maintain safe junction temperature under sustained load.
Can JANTX1N4121-1/TR be used in place of commercial 1N4121?
JANTX1N4121-1/TR can functionally replace commercial 1N4121 in most circuits due to identical electrical parameters, but it is not a drop-in replacement in terms of qualification or sourcing. JANTX1N4121-1/TR undergoes additional screening per MIL-PRF-19500/435, carries full traceability, and is subject to different procurement controls - making it appropriate for defense programs but potentially over-specified and higher-cost for commercial designs where MIL-spec is unnecessary.
JANTX1N4121-1/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
- Grade:
- Military
- Qualification:
- MIL-PRF-19500/435
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
JANTX1N4121-1/TR FAQ
1.How can I place an order for JANTX1N4121-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4121-1/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 JANTX1N4121-1/TR reliable?
The price and inventory of JANTX1N4121-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4121-1/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4121-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4121-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTX1N4121-1/TR?
JANTX1N4121-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4121-1/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 JANTX1N4121-1/TR?
For technical support, including JANTX1N4121-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4121-1/TR requirements.
6.How does Aetrix verify that JANTX1N4121-1/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4121-1/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 JANTX1N4121-1/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4121-1/TR?
All JANTX1N4121-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4121-1/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 JANTX1N4121-1/TR part is unused and in its original packaging.
Return procedure for JANTX1N4121-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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