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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology JANS1N4120C-1/TR

Name: JANS1N4120C-1/TR
Brand: Microchip Technology
SKU: JANS1N4120C-1/TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: JANS1N4120C-1/TR

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: JANS1N4120C-1/TR.pdf

Description:: DIODE ZENER 30V 500MW DO204AH

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Product details

Overview

JANS1N4120C-1/TR from Microsemi is a 30 V, 2% tolerance, 500 mW metallurgically bonded glass Zener diode in DO-35 (DO-204AH) axial-leaded package, qualified to JANS level per MIL-PRF-19500/435 for high-reliability aerospace and defense voltage regulation. It delivers stable regulation at 250 mA test current with 200 Ω dynamic impedance and +0.095 %/°C temperature coefficient.

For engineers reviewing the JANS1N4120C-1/TR datasheet, JANS1N4120C-1/TR pinout, JANS1N4120C-1/TR application, or JANS1N4120C-1/TR equivalent, key selection criteria include Zener voltage tolerance (2%), radiation hardness, hermetic glass packaging, noise density (≤1 μV/√Hz), and MIL-qualified thermal derating behavior up to +175 °C junction temperature.

Technical Context

This device operates as a precision shunt voltage regulator in reverse-biased breakdown mode, with cathode band marking polarity. Its metallurgical bond ensures low leakage and stable long-term Zener voltage under thermal cycling and radiation exposure.

Designed for high-reliability environments, JANS1N4120C-1/TR exhibits minimal capacitance (typ. <2 pF at 30 V), low noise density (≤1 μV/√Hz), and non-ESD-sensitive behavior per MIL-STD-750 Method 1020 - enabling use in analog reference, power supply feedback, and overvoltage protection circuits where stability across -65 °C to +175 °C is mandatory.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	30.0 V ±2% at 250 mA - enables precise 30 V reference generation with tight tolerance for feedback loops and calibration circuits.
Power Dissipation	500 mW at 25 °C, linearly derated to zero at 175 °C - supports sustained operation in high-temp avionics enclosures with proper lead-length thermal management.
Dynamic Impedance Z_ZT	200 Ω max at 250 mA - ensures minimal output voltage variation under load transients in regulated power supplies.
Temp. Coefficient α_VZ	+0.095 %/°C - provides predictable, monotonic voltage drift over temperature, simplifying compensation in wide-range systems.
Noise Density ND	≤1 μV/√Hz - critical for low-noise analog references and precision instrumentation requiring clean DC bias.
Reverse Leakage I_R	≤0.01 µA at 24 V - guarantees negligible current draw in standby or high-impedance sensing nodes.
Junction Temp. Range	-65 °C to +175 °C - validated for space-grade and nuclear-hardened applications per MIL-PRF-19500/435.

Pinout & Package

DO-35 (DO-204AH) hermetically sealed axial-leaded glass package; cathode identified by single black band on body; leads tin-lead plated and solderable per MIL-STD-750 Method 2026.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference node	Connected to system ground or lower-potential rail; serves as voltage reference return path in shunt regulator topology.
Cathode	Zener regulation terminal / Input node	Banded end; connected to unregulated input; clamps voltage to 30 V when reverse-biased above breakdown threshold.

Key Features

Feature	Design Value
MIL-PRF-19500/435 JANS qualification	Validated reliability for flight-critical systems including burn-in, life testing, and radiation hardness per MicroNote 050.
Metallurgical bond construction	Eliminates interfacial delamination risk under thermal shock, ensuring stable V_Z over 10,000+ thermal cycles (-65/+175 °C).
Hermetic glass DO-35 package	Prevents moisture ingress and parameter drift in humid or corrosive environments typical of military field deployments.
Low noise density	≤1 μV/√Hz enables use in precision analog front-ends without additional filtering, reducing BOM count in telemetry receivers.
Non-ESD-sensitive design	Withstands handling per MIL-STD-750 Method 1020 without screening or special ESD controls - lowers assembly cost in Class 1000 cleanrooms.

Applications

Avionics Power Monitoring	Satellite Payload Reference
Use Scenario: Real-time monitoring of 28 V DC bus voltage in aircraft auxiliary power units using resistive divider + comparator. IC Role / Device Role / Timing Role: Shunt reference providing stable 30 V threshold for overvoltage trip detection. Use Value: Tight 2% tolerance and +0.095 %/°C TC ensure trip point remains within ±0.5 V across -55 °C to +85 °C operating range.	Use Scenario: Precision voltage reference for ADC biasing in star tracker electronics aboard LEO satellites. IC Role / Device Role / Timing Role: Low-noise Zener source feeding op-amp buffer driving 16-bit SAR ADC reference input. Use Value: ≤1 μV/√Hz noise density prevents degradation of effective number of bits (ENOB) below 15.2 bits at 100 kSPS.
Nuclear Instrumentation	Tactical Radios
Use Scenario: Biasing photomultiplier tube (PMT) dynode chain in radiation survey meters operating in high-dose-rate fields. IC Role / Device Role / Timing Role: Radiation-hardened shunt regulator maintaining stable dynode voltages despite total ionizing dose >100 krad(Si). Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or derating, reducing module mass by 12 g.	Use Scenario: Overvoltage protection clamp on 24 V RF power amplifier supply rail in manpack radios exposed to automotive battery transients. IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing 100 V/10 ms load-dump spikes without failure. Use Value: 500 mW rating with 250 °C/W junction-to-lead thermal resistance sustains 3× surge energy vs. commercial-grade equivalents.

Avionics Power Monitoring

Satellite Payload Reference

Use Scenario: Real-time monitoring of 28 V DC bus voltage in aircraft auxiliary power units using resistive divider + comparator.

IC Role / Device Role / Timing Role: Shunt reference providing stable 30 V threshold for overvoltage trip detection.

Use Value: Tight 2% tolerance and +0.095 %/°C TC ensure trip point remains within ±0.5 V across -55 °C to +85 °C operating range.

Use Scenario: Precision voltage reference for ADC biasing in star tracker electronics aboard LEO satellites.

IC Role / Device Role / Timing Role: Low-noise Zener source feeding op-amp buffer driving 16-bit SAR ADC reference input.

Use Value: ≤1 μV/√Hz noise density prevents degradation of effective number of bits (ENOB) below 15.2 bits at 100 kSPS.

Nuclear Instrumentation

Tactical Radios

Use Scenario: Biasing photomultiplier tube (PMT) dynode chain in radiation survey meters operating in high-dose-rate fields.

IC Role / Device Role / Timing Role: Radiation-hardened shunt regulator maintaining stable dynode voltages despite total ionizing dose >100 krad(Si).

Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or derating, reducing module mass by 12 g.

Use Scenario: Overvoltage protection clamp on 24 V RF power amplifier supply rail in manpack radios exposed to automotive battery transients.

IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing 100 V/10 ms load-dump spikes without failure.

Use Value: 500 mW rating with 250 °C/W junction-to-lead thermal resistance sustains 3× surge energy vs. commercial-grade equivalents.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
JANTXV1N4120C-1	Same 30 V ±2%, DO-35 package, but qualified only to JANTXV level (not JANS); lower screening rigor and no radiation hardness validation.	Approved for ground-based military systems but not spaceflight or nuclear environments.	Select when full JANS qualification is not required and cost sensitivity outweighs radiation assurance needs.
1N4120C-1/TR	Commercial-grade version: same electrical specs but no MIL-PRF-19500 qualification; RoHS-compliant plating optional.	Limited to industrial or commercial avionics with relaxed reliability requirements and no radiation exposure.	Choose for prototyping or non-safety-critical subsystems where traceability and extended temperature validation are unnecessary.

Compared with JANTXV1N4120C-1 and 1N4120C-1/TR, JANS1N4120C-1/TR uniquely provides documented radiation hardness, full JANS-level screening (including lot acceptance tests), and guaranteed performance from -65 °C to +175 °C - making it the only option for mission-critical space and nuclear instrumentation.

Availability

JANS1N4120C-1/TR is available at Aetrix Electronics and suitable for avionics power monitoring, satellite payload reference, nuclear instrumentation, and tactical radio design requiring stable component supply with full MIL-PRF-19500/435 traceability and radiation assurance.

Supply support for JANS1N4120C-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 ICs, discrete devices, and radiation-hardened components for aerospace, defense, and industrial markets.

JANS1N4120C-1/TR belongs to Microsemi's legacy MIL-qualified Zener diode family designed specifically for voltage regulation in extreme-environment electronics where long-term parametric stability, hermeticity, and radiation tolerance are non-negotiable.

FAQ

What is the Zener voltage tolerance of JANS1N4120C-1/TR?

JANS1N4120C-1/TR has a nominal Zener voltage of 30.0 V with a ±2% tolerance, as indicated by the "C" suffix in its nomenclature per Microsemi's part numbering convention. This tolerance is verified at 250 mA test current and 25 °C ambient, and applies across the full qualified temperature range (-65 °C to +175 °C) under MIL-PRF-19500/435 screening.

Is JANS1N4120C-1/TR radiation hardened?

Yes, JANS1N4120C-1/TR is inherently radiation hard per Microsemi MicroNote 050 due to its metallurgically bonded structure and hermetic DO-35 glass package. It is qualified to JANS level per MIL-PRF-19500/435, which includes radiation testing protocols appropriate for space and nuclear applications - unlike commercial or JANTXV variants.

What is the maximum Zener current I_ZM for JANS1N4120C-1/TR?

The maximum Zener current I_ZM for JANS1N4120C-1/TR is 22.8 mA at 25 °C, calculated from its 500 mW power rating and 30 V nominal Zener voltage (I_ZM = P_M(AV)/V_Z). Derating begins linearly at 50 °C lead temperature, reaching zero at 175 °C - consistent with the thermal resistance R_θJL of 250 °C/W specified for 3/8″ lead length.

Does JANS1N4120C-1/TR have RoHS-compliant plating?

No, JANS1N4120C-1/TR uses traditional tin-lead plating per MIL-STD-750 Method 2026 to ensure solderability and reliability under thermal cycling in high-reliability applications. RoHS-compliant matte-tin plating is available only on commercial-grade versions (e.g., 1N4120C-1/TR), not on JAN, JANTX, JANTXV, or JANS qualified parts.

What is the noise density specification for JANS1N4120C-1/TR?

JANS1N4120C-1/TR has a maximum noise density of ≤1 μV/√Hz at 25 °C, measured in the 1 kHz–3 kHz band with 250 mA Zener test current. This ultra-low noise performance is confirmed in Microsemi's T4-LDS-0245-2 datasheet and results from its metallurgical bond construction - critical for precision analog reference designs.

JANS1N4120C-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):: 30 V

Tolerance:: ±2%

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 (TJ)

Grade:: Military

Qualification:: MIL-PRF-19500/435

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AH (DO-35)

JANS1N4120C-1/TR FAQ

1.How can I place an order for JANS1N4120C-1/TR through Aetrix?

Please submit a Request for Quotation (RFQ) for JANS1N4120C-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 JANS1N4120C-1/TR reliable?

The price and inventory of JANS1N4120C-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 JANS1N4120C-1/TR is usually 5 days.

3.What payment methods are accepted for JANS1N4120C-1/TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANS1N4120C-1/TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for JANS1N4120C-1/TR?

JANS1N4120C-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your JANS1N4120C-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 JANS1N4120C-1/TR?

For technical support, including JANS1N4120C-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4120C-1/TR requirements.

6.How does Aetrix verify that JANS1N4120C-1/TR is sourced from the original manufacturer or authorized distributors?

All JANS1N4120C-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 JANS1N4120C-1/TR meets industry standards.

7.What is the process for return or replacement of JANS1N4120C-1/TR?

All JANS1N4120C-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4120C-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 JANS1N4120C-1/TR part is unused and in its original packaging.

Return procedure for JANS1N4120C-1/TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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