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

Microchip Technology JANTXV1N4977US/TR

Name: JANTXV1N4977US/TR
Brand: Microchip Technology
SKU: JANTXV1N4977US/TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: JANTXV1N4977US/TR

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: SQ-MELF, E

Datasheet:: JANTXV1N4977US/TR.pdf

Description:: DIODE ZENER 62V 5W E-MELF

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Product details

Overview

JANTXV1N4977US/TR from Microsemi is a surface-mount, voidless-hermetically-sealed 5 W glass Zener diode with nominal Zener voltage 62 V, ±5% tolerance, and maximum power dissipation of 5 W at T_EC = 140 °C. It operates from −65 °C to +175 °C, features 42 Ω dynamic impedance at 20 mA test current, and delivers stable voltage regulation in high-reliability military avionics power conditioning circuits.

For engineers reviewing the JANTXV1N4977US/TR datasheet, JANTXV1N4977US/TR pinout, JANTXV1N4977US/TR application, or JANTXV1N4977US/TR equivalent, this part supports critical voltage reference and overvoltage protection functions where hermetic sealing, radiation hardness, and MIL-PRF-19500/356 qualification are mandatory design requirements.

Technical Context

This device belongs to Microsemi's JAN/JANTX/JANTXV-qualified 1N49xxUS series of surface-mount Zener regulators. It uses a voidless hard-glass package with tungsten slugs and copper end caps with Sn/Pb finish, enabling operation up to 175 °C junction temperature and compliance with MIL-STD-750 Method 1020 for ESD immunity.

The JANTXV1N4977US/TR exhibits a temperature coefficient of +0.100 %/°C at I_ZT, a forward voltage of 1.50 V at 1.0 A, and a maximum reverse leakage current of 2 μA at 47.1 V - all specified per MIL-PRF-19500/356 Class V screening and tested under controlled thermal conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	62 V nominal at 20 mA test current - defines precise clamping threshold for overvoltage protection in 28 V and 115 V AC/DC power systems.
Power Dissipation	5 W at T_EC = 140 °C - enables robust transient energy absorption without derating in conduction-cooled military chassis environments.
Dynamic Impedance (Z_Z)	42 Ω at I_ZT = 20 mA - ensures tight regulation stability under varying load currents in precision reference applications.
Operating Temperature	−65 °C to +175 °C - supports deployment in engine-mounted electronics, missile guidance units, and space-qualified subsystems.
Reverse Leakage (I_R)	2 μA max at 47.1 V - guarantees minimal standby power loss and signal integrity in low-current bias networks.
Thermal Resistance	7 °C/W junction-to-end-cap - allows direct thermal coupling to metal chassis for passive heat sinking without heatsinks.

Pinout & Package

Package: Hermetically sealed voidless hard-glass "E" package (also designated D-5B), with copper end caps and Sn/Pb finish; cathode indicated by band; weight 539 mg; tape-and-reel compliant per EIA-481-B.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential node in reverse-biased Zener configuration; carries full surge current during clamping events.
Cathode	Zener breakdown terminal	Marked with band; connected to higher-potential node; establishes regulated output voltage referenced to ground or supply rail.

Key Features

Feature	Design Value
Voidless hermetic glass construction	Eliminates internal moisture and voids, preventing parametric drift and catastrophic failure under thermal cycling and humidity stress.
MIL-PRF-19500/356 JANTXV qualification	Includes full Level V screening (burn-in, temperature cycling, life test) for mission-critical aerospace and defense platforms.
Triple-layer passivation	Provides enhanced surface insulation and resistance to contamination-induced leakage in high-voltage, low-current bias networks.
Inherent radiation hardness	Validated per Microsemi MicroNote 050 for total ionizing dose (TID) tolerance - suitable for low-earth orbit and nuclear-hardened systems.

Applications

Aerospace Power Conditioning	Military Radar Bias Supply
Use Scenario: Regulating auxiliary 62 V rail in airborne radar transceiver modules exposed to −55 °C to +125 °C ambient. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference and overvoltage clamp in unregulated DC-DC converter feedback path. Use Value: Maintains ±1.5% output accuracy across temperature and lifetime due to hermetic seal and Category I metallurgical bond.	Use Scenario: Providing stable bias voltage for GaN RF power amplifier stages in ground-based S-band radar front ends. IC Role / Device Role / Timing Role: Precision voltage reference for gate bias control, ensuring consistent amplifier gain and linearity. Use Value: Delivers <2 μA leakage at 47.1 V, minimizing quiescent current error and thermal drift in high-impedance bias networks.
Satellite Payload Voltage Reference	Nuclear Instrumentation Signal Clamping
Use Scenario: Generating stable 62 V reference for ADC input scaling in scientific payload telemetry systems operating in LEO. IC Role / Device Role / Timing Role: Primary shunt regulator establishing known voltage node for analog signal conditioning circuitry. Use Value: Radiation-hardened construction ensures no parametric shift after 100 krad(Si) TID exposure per MicroNote 050.	Use Scenario: Protecting front-end amplifiers from ESD and lightning-induced transients in reactor monitoring instrumentation. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping fast-rising spikes above 62 V while maintaining low leakage below threshold. Use Value: Withstands 20 A non-repetitive 8.3 ms surge current and exhibits <1.5 ns response time due to low junction capacitance.

Aerospace Power Conditioning

Military Radar Bias Supply

Use Scenario: Regulating auxiliary 62 V rail in airborne radar transceiver modules exposed to −55 °C to +125 °C ambient.

IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference and overvoltage clamp in unregulated DC-DC converter feedback path.

Use Value: Maintains ±1.5% output accuracy across temperature and lifetime due to hermetic seal and Category I metallurgical bond.

Use Scenario: Providing stable bias voltage for GaN RF power amplifier stages in ground-based S-band radar front ends.

IC Role / Device Role / Timing Role: Precision voltage reference for gate bias control, ensuring consistent amplifier gain and linearity.

Use Value: Delivers <2 μA leakage at 47.1 V, minimizing quiescent current error and thermal drift in high-impedance bias networks.

Satellite Payload Voltage Reference

Nuclear Instrumentation Signal Clamping

Use Scenario: Generating stable 62 V reference for ADC input scaling in scientific payload telemetry systems operating in LEO.

IC Role / Device Role / Timing Role: Primary shunt regulator establishing known voltage node for analog signal conditioning circuitry.

Use Value: Radiation-hardened construction ensures no parametric shift after 100 krad(Si) TID exposure per MicroNote 050.

Use Scenario: Protecting front-end amplifiers from ESD and lightning-induced transients in reactor monitoring instrumentation.

IC Role / Device Role / Timing Role: Transient voltage suppressor clamping fast-rising spikes above 62 V while maintaining low leakage below threshold.

Use Value: Withstands 20 A non-repetitive 8.3 ms surge current and exhibits <1.5 ns response time due to low junction capacitance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4977US	Same electrical specs but commercial-grade (non-military); no MIL-PRF-19500 screening or radiation data.	Lacks JANTXV-level reliability testing; unsuitable for flight-critical or radiation-exposed use cases.	Select only for cost-sensitive terrestrial industrial designs with relaxed qualification requirements.
JANTX1N4977US/TR	Same 62 V Zener voltage and package, but JANTX (not JANTXV) screening level - excludes burn-in and life test.	Meets MIL-PRF-19500/356 Class III, not Class V; reduced confidence in long-term parametric stability.	Acceptable for non-safety-critical ground systems where full JANTXV screening is unnecessary.

Compared with 1N4977US and JANTX1N4977US/TR, the JANTXV1N4977US/TR provides verified Class V screening, guaranteed radiation hardness, and tighter process controls - making it the sole choice for manned spacecraft, missile guidance, and nuclear command systems requiring zero-failure probability.

Availability

JANTXV1N4977US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, military radar bias supply, and satellite payload voltage reference requiring stable component supply under extended lead times and strict traceability.

Supply support for JANTXV1N4977US/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 (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 JANTXV1N4977US/TR belongs to Microsemi's legacy 1N49xxUS military Zener family, engineered specifically for extreme-environment voltage regulation where hermeticity, radiation tolerance, and MIL-PRF-19500 compliance are non-negotiable.

FAQ

What is the Zener voltage tolerance for JANTXV1N4977US/TR?

The JANTXV1N4977US/TR has a nominal Zener voltage of 62 V with a standard tolerance of ±5%, as defined in MIL-PRF-19500/356. No suffix indicates this standard tolerance; tighter tolerances (e.g., ±2% or ±1%) require different part number suffixes not present in JANTXV1N4977US/TR.

Does JANTXV1N4977US/TR require heatsinking in 5 W operation?

JANTXV1N4977US/TR achieves its full 5 W rating at T_EC = 140 °C and has a junction-to-end-cap thermal resistance of 7 °C/W. When mounted directly to a thermally conductive chassis or cold plate, no additional heatsink is required - the end caps serve as primary thermal interface per the D-5B package design.

Is JANTXV1N4977US/TR compatible with lead-free solder reflow profiles?

No - JANTXV1N4977US/TR features Sn/Pb (tin/lead) terminations on copper end caps and is not qualified for lead-free reflow. Its maximum peak reflow temperature is limited to 235 °C per MIL-STD-202 Method 210, and exposure to lead-free profiles (>260 °C) risks metallurgical degradation and seal integrity loss.

What is the surge current rating for JANTXV1N4977US/TR?

JANTXV1N4977US/TR supports a non-repetitive peak Zener surge current (I_ZSM) of 20.0 A for an 8.3 ms half-sine wave, as specified in the Electrical Characteristics table. This rating assumes proper PCB thermal mass and mounting to dissipate transient energy without exceeding junction temperature limits.

How is polarity identified on JANTXV1N4977US/TR?

JANTXV1N4977US/TR uses a cathode band marking on the glass body to indicate polarity. The banded end is the cathode; the opposite end is the anode. This marking aligns with JEDEC-standard orientation for surface-mount Zener diodes and must be observed during placement to ensure correct reverse-bias operation.

JANTXV1N4977US/TR Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: SQ-MELF, E

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 62 V

Tolerance:: ±5%

Power - Max:: 5 W

Impedance (Max) (Zzt):: 42 Ohms

Current - Reverse Leakage @ Vr:: 2 µA @ 47.1 V

Voltage - Forward (Vf) (Max) @ If:: 1.5 V @ 1 A

Operating Temperature:: -65°C ~ 175°C (TJ)

Grade:: Military

Qualification:: MIL-PRF-19500/356

Mounting Type:: Surface Mount

Supplier Device Package:: E-MELF

JANTXV1N4977US/TR FAQ

1.How can I place an order for JANTXV1N4977US/TR through Aetrix?

Please submit a Request for Quotation (RFQ) for JANTXV1N4977US/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 JANTXV1N4977US/TR reliable?

The price and inventory of JANTXV1N4977US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTXV1N4977US/TR is usually 5 days.

3.What payment methods are accepted for JANTXV1N4977US/TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTXV1N4977US/TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for JANTXV1N4977US/TR?

JANTXV1N4977US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your JANTXV1N4977US/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 JANTXV1N4977US/TR?

For technical support, including JANTXV1N4977US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTXV1N4977US/TR requirements.

6.How does Aetrix verify that JANTXV1N4977US/TR is sourced from the original manufacturer or authorized distributors?

All JANTXV1N4977US/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 JANTXV1N4977US/TR meets industry standards.

7.What is the process for return or replacement of JANTXV1N4977US/TR?

All JANTXV1N4977US/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTXV1N4977US/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 JANTXV1N4977US/TR part is unused and in its original packaging.

Return procedure for JANTXV1N4977US/TR:

1.Submit a request within 90 days.

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

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