Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Microchip Technology JANTX1N4976CUS/TR

Name: JANTX1N4976CUS/TR
Brand: Microchip Technology
SKU: JANTX1N4976CUS/TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: JANTX1N4976CUS/TR

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: SQ-MELF, E

Datasheet:: JANTX1N4976CUS/TR.pdf

Description:: DIODE ZENER 56V 5W E-MELF

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:7,310

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

JANTX1N4976US/TR from Microsemi is a military-qualified, voidless hermetically sealed surface-mount 5 W Zener diode with nominal Zener voltage of 56 V, ±5% tolerance, 35 mA test current, and 35 Ω dynamic impedance at I_ZT. It operates from –65 °C to +175 °C and delivers stable voltage regulation in high-reliability power conditioning circuits for aerospace avionics and radiation-hardened systems.

For engineers reviewing the JANTX1N4976US/TR datasheet, JANTX1N4976US/TR pinout, JANTX1N4976US/TR application, or JANTX1N4976US/TR equivalent, this part is selected for mission-critical voltage reference and overvoltage protection where hermetic sealing, MIL-PRF-19500/356 compliance, and wide temperature operation are mandatory design requirements.

Technical Context

This device belongs to the JANTX-grade 1N49xxUS series, featuring triple-layer passivation and Category I internal metallurgical bonds per MIL-PRF-19500/356. Its voidless hard-glass construction ensures zero internal delamination under thermal cycling and mechanical stress.

It regulates voltage across a broad current range (10%–50% of I_ZM), with ΔV_Z ≤ 4.4 V variation and α_VZ = +0.095 %/°C at 35 mA. Thermal resistance is 7 °C/W junction-to-end-cap, enabling reliable 5 W dissipation at T_EC = 140 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage (V_Z)	56 V ±5% at 35 mA - defines precise clamping threshold for overvoltage protection and reference stability.
Power Dissipation	5 W @ T_EC = 140 °C - supports continuous operation in high-temperature environments without derating until 175 °C.
Dynamic Impedance (Z_Z)	35 Ω at I_ZT = 35 mA - ensures low AC impedance for effective ripple suppression in regulated supplies.
Max Reverse Leakage (I_R)	2 μA @ V_R = 42.6 V - guarantees minimal standby current in high-impedance bias networks.
Operating Temperature	–65 °C to +175 °C - enables deployment in extreme environments including space-grade and downhole electronics.
Surge Current (I_ZSM)	2.8 A @ 8.3 ms - withstands transient overvoltage events such as ESD or load dump without degradation.
Forward Voltage (V_F)	1.50 V @ 1.0 A - supports use as forward-biased clamp or polarity indicator in dual-role circuits.

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry terminal in forward bias; connected to ground or low-side reference in Zener mode	Provides low-resistance path for forward conduction; must be routed with adequate thermal relief for 1.5 V drop at 1 A.
Cathode	Current exit terminal in forward bias; connected to regulated node in reverse-bias Zener operation	Carries full Zener current; band marking enables unambiguous orientation during automated placement and visual inspection.

Key Features

Feature	Design Value
Voidless hermetic glass seal	Eliminates internal moisture ingress and interfacial delamination-critical for >20-year field life in sealed modules.
Category I metallurgical bond	Ensures mechanical integrity under shock/vibration per MIL-STD-883 Method 2002, validated for aerospace flight hardware.
Nonsensitive to ESD	Qualified to MIL-STD-750 Method 1020 - no handling precautions required beyond standard static-safe protocols.
Inherent radiation hardness	Specified per MicroNote 050 - suitable for total ionizing dose (TID) environments up to 100 krad(Si) without parameter shift.
Triple-layer passivation	Prevents surface leakage and contamination-induced parameter drift in humid or chemically aggressive enclosures.

Applications

Aerospace Power Bus Protection	Radiation-Hardened Reference Source
Use Scenario: Clamp transients on 28 V DC aircraft bus during load dump or lightning-induced surges. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to limit voltage excursion to ≤56 V. Use Value: Withstands 2.8 A surge for 8.3 ms and maintains <2 μA leakage at 42.6 V, ensuring bus integrity without false triggering.	Use Scenario: Provide stable 56 V reference for precision ADC biasing in satellite telemetry subsystems. IC Role / Device Role / Timing Role: Voltage reference element in high-stability analog front-end with minimal tempco drift. Use Value: +0.095 %/°C tempco and 35 Ω dynamic impedance enable <±0.5% reference error over –65 °C to +125 °C operational range.
Military Vehicle Control Module	Downhole Sensor Conditioning
Use Scenario: Regulate auxiliary 56 V rail for actuator drivers in tracked vehicle engine control units. IC Role / Device Role / Timing Role: Primary shunt regulator maintaining constant voltage despite battery ripple and alternator noise. Use Value: 5 W continuous rating at 140 °C end-cap temperature supports operation inside sealed, convection-limited enclosures.	Use Scenario: Stabilize bias voltage for piezoresistive pressure sensors in oil/gas wellhead instrumentation. IC Role / Device Role / Timing Role: High-temperature Zener reference enabling accurate sensor excitation at 175 °C ambient. Use Value: Full –65 °C to +175 °C operating range and hermetic seal prevent parameter shift or failure in corrosive, high-pressure borehole environments.

Aerospace Power Bus Protection

Radiation-Hardened Reference Source

Use Scenario: Clamp transients on 28 V DC aircraft bus during load dump or lightning-induced surges.

IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to limit voltage excursion to ≤56 V.

Use Value: Withstands 2.8 A surge for 8.3 ms and maintains <2 μA leakage at 42.6 V, ensuring bus integrity without false triggering.

Use Scenario: Provide stable 56 V reference for precision ADC biasing in satellite telemetry subsystems.

IC Role / Device Role / Timing Role: Voltage reference element in high-stability analog front-end with minimal tempco drift.

Use Value: +0.095 %/°C tempco and 35 Ω dynamic impedance enable <±0.5% reference error over –65 °C to +125 °C operational range.

Military Vehicle Control Module

Downhole Sensor Conditioning

Use Scenario: Regulate auxiliary 56 V rail for actuator drivers in tracked vehicle engine control units.

IC Role / Device Role / Timing Role: Primary shunt regulator maintaining constant voltage despite battery ripple and alternator noise.

Use Value: 5 W continuous rating at 140 °C end-cap temperature supports operation inside sealed, convection-limited enclosures.

Use Scenario: Stabilize bias voltage for piezoresistive pressure sensors in oil/gas wellhead instrumentation.

IC Role / Device Role / Timing Role: High-temperature Zener reference enabling accurate sensor excitation at 175 °C ambient.

Use Value: Full –65 °C to +175 °C operating range and hermetic seal prevent parameter shift or failure in corrosive, high-pressure borehole environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
JANTXV1N4976US	Higher screening grade (JANTXV per MIL-PRF-19500/356); tighter lot acceptance testing and extended burn-in.	Required for Class H (spaceflight) or Class K (nuclear survivability) programs where zero defect probability is mandated.	Select JANTXV1N4976US when mission assurance level exceeds JANTX, especially for launch-critical subsystems.
1N4976US	Commercial-grade version; no MIL-qualified screening, wider parametric spread, and no radiation hardness documentation.	Suitable only for non-mission-critical industrial controls or lab prototypes where cost and lead time outweigh reliability needs.	Choose 1N4976US for early development or non-safety-critical applications where MIL-spec compliance is not required.

Compared with JANTX1N4976US/TR, JANTXV1N4976US adds process verification for zero-defect operation but shares identical electrical specs and package; 1N4976US omits military screening and radiation data, limiting use to benign environments.

Availability

JANTX1N4976US/TR is available at Aetrix Electronics and suitable for aerospace power bus protection, radiation-hardened reference source, and military vehicle control module applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for JANTX1N4976US/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) designs high-reliability analog and mixed-signal semiconductors for defense, aerospace, and industrial markets, with core expertise in radiation-hardened and hermetically sealed components.

The JANTX1N4976US/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener diode family, engineered specifically for voltage regulation in mission-critical systems where failure is not an option.

FAQ

What is the Zener voltage tolerance for JANTX1N4976US/TR?

JANTX1N4976US/TR has a nominal Zener voltage of 56 V with a standard tolerance of ±5%, as defined in MIL-PRF-19500/356. This tolerance applies at the specified test current of 35 mA and ambient temperature of 25 °C. No suffix letter indicates the standard 5% grade; tighter tolerances require C (±2%) or D (±1%) suffixes, which are not present in this part number.

Does JANTX1N4976US/TR require special handling for ESD sensitivity?

No, JANTX1N4976US/TR is nonsensitive to ESD per MIL-STD-750 Method 1020. It does not require special ESD handling beyond standard static-safe workbench practices. The triple-layer passivation and hermetic seal contribute to its robustness against electrostatic discharge events during assembly and field operation.

What is the maximum continuous power dissipation for JANTX1N4976US/TR?

JANTX1N4976US/TR is rated for 5 W continuous power dissipation at an end-cap temperature (T_EC) of 140 °C. Above this temperature, power must be linearly derated to zero at 175 °C. Its 7 °C/W junction-to-end-cap thermal resistance enables efficient heat transfer to the PCB pad or heatsink in surface-mount configurations.

Is JANTX1N4976US/TR suitable for high-temperature downhole applications?

Yes, JANTX1N4976US/TR is explicitly rated for operation from –65 °C to +175 °C, making it suitable for downhole sensor conditioning in oil/gas wellheads. Its voidless hermetic glass package prevents moisture ingress and parameter drift under high-pressure, high-temperature conditions where conventional plastic-packaged Zeners would fail.

How is polarity identified on JANTX1N4976US/TR?

Polarity on JANTX1N4976US/TR is indicated by a visible band on the cathode end of the glass body. The banded end is the cathode, which connects to the higher-potential node in Zener regulation mode. This marking is consistent across all 1N49xxUS-series devices and is verified during MIL-PRF-19500/356 visual inspection.

JANTX1N4976CUS/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):: 56 V

Tolerance:: ±2%

Power - Max:: 5 W

Impedance (Max) (Zzt):: 35 Ohms

Current - Reverse Leakage @ Vr:: 2 µA @ 42.6 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

JANTX1N4976CUS/TR FAQ

1.How can I place an order for JANTX1N4976CUS/TR through Aetrix?

Please submit a Request for Quotation (RFQ) for JANTX1N4976CUS/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 JANTX1N4976CUS/TR reliable?

The price and inventory of JANTX1N4976CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4976CUS/TR is usually 5 days.

3.What payment methods are accepted for JANTX1N4976CUS/TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4976CUS/TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for JANTX1N4976CUS/TR?

JANTX1N4976CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your JANTX1N4976CUS/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 JANTX1N4976CUS/TR?

For technical support, including JANTX1N4976CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4976CUS/TR requirements.

6.How does Aetrix verify that JANTX1N4976CUS/TR is sourced from the original manufacturer or authorized distributors?

All JANTX1N4976CUS/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 JANTX1N4976CUS/TR meets industry standards.

7.What is the process for return or replacement of JANTX1N4976CUS/TR?

All JANTX1N4976CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4976CUS/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 JANTX1N4976CUS/TR part is unused and in its original packaging.

Return procedure for JANTX1N4976CUS/TR:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

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.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

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.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

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…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

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…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

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…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

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 …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

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…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

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…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

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…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

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…