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

Microchip Technology JANTX1N4972CUS/TR

Name: JANTX1N4972CUS/TR
Brand: Microchip Technology
SKU: JANTX1N4972CUS/TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: JANTX1N4972CUS/TR

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: SQ-MELF, E

Datasheet:: JANTX1N4972CUS/TR.pdf

Description:: DIODE ZENER 39V 5W E-MELF

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Product details

Overview

JANTX1N4972US/TR from Microsemi is a military-qualified, hermetically sealed surface-mount 5 W Zener diode with nominal Zener voltage of 39 V, ±5% tolerance, 14 Ω dynamic impedance at 30 mA test current, and rated for operation from –65 °C to +175 °C - used in high-reliability voltage regulation for aerospace power conditioning and radiation-hardened instrumentation.

For engineers reviewing the JANTX1N4972US/TR datasheet, JANTX1N4972US/TR pinout, JANTX1N4972US/TR application, or JANTX1N4972US/TR equivalent, this part requires attention to its voidless-glass package thermal resistance (7 °C/W), surge current rating (4.0 A @ 8.3 ms), and Category I metallurgical bond construction per MIL-PRF-19500/356.

Technical Context

This Zener regulator operates in reverse breakdown with tightly controlled voltage regulation across 10–50% of maximum Zener current (IZM = 4.0 A), exhibiting low dynamic impedance (14 Ω) and minimal temperature coefficient (+0.095 %/°C). Its voidless-glass hermetic seal and triple-layer passivation ensure long-term stability under thermal cycling and humidity exposure.

The device uses an internal tungsten slug and copper end caps with Sn/Pb finish, enabling reliable solder joint formation and mechanical robustness. It is polarity-marked with a cathode band and conforms to EIA-481-B tape-and-reel packaging standards for automated placement.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	39 V nominal at 30 mA test current - defines stable regulation point for precision reference circuits
Power Dissipation	5 W @ T_EC = 140 °C - requires heatsinking or board copper area for sustained full-power operation
Dynamic Impedance (Z_Z)	14 Ω at I_ZT = 30 mA - ensures minimal output voltage variation under load transients
Max Reverse Leakage (I_R)	2 μA at V_R = 29.7 V - guarantees low standby power loss in high-impedance bias networks
Temp Coefficient (αV_Z)	+0.095 %/°C - enables predictable drift compensation in wide-temperature-range designs
Surge Current (I_ZSM)	4.0 A peak @ 8.3 ms half-sine - withstands transient overvoltage events without degradation
Forward Voltage (V_F)	1.50 V @ 1.0 A - supports use as clamping diode in bidirectional protection schemes

Pinout & Package

Package: "E" (also designated D-5B) - hermetically sealed voidless glass case with tungsten slugs and copper end caps, marked with cathode band, weight 539 mg.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Reverse-biased input terminal	Connected to lower-potential node; forms regulated output at cathode when reverse-biased
Cathode	Regulated output terminal	Marked by band; delivers stable 39 V reference relative to anode under specified I_Z

Key Features

Feature	Design Value
Voidless hermetic glass seal	Prevents moisture ingress and internal corrosion - critical for >20-year field life in space-grade systems
Category I metallurgical bond	Ensures mechanical integrity under shock/vibration up to 100 g - qualified per MIL-PRF-19500/356
Triple-layer passivation	Reduces surface leakage and enhances long-term parameter stability in humid or contaminated environments
Nonsensitive to ESD	Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling
Radiation hardness	Inherently tolerant to total ionizing dose (TID) per MicroNote 050 - suitable for low-earth orbit missions

Applications

Aerospace Power Conditioning	Radiation-Hardened Instrumentation
Use Scenario: Regulating auxiliary supply rails in satellite telemetry modules exposed to thermal cycling and vacuum. IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage clamp in DC-DC converter feedback and protection circuitry. Use Value: Maintains 39 V regulation within ±5% across –65 °C to +175 °C, eliminating need for active compensation.	Use Scenario: Providing stable bias voltage for analog front-end amplifiers in nuclear reactor monitoring sensors. IC Role / Device Role / Timing Role: Precision shunt reference and transient suppressor in high-TID environments. Use Value: Delivers <2 μA leakage at 29.7 V and survives >100 krad(Si) without parameter shift per MicroNote 050.
Military Avionics Voltage Reference	High-Reliability Industrial Control
Use Scenario: Generating reference voltage for ADCs in flight-critical navigation subsystems operating under extreme vibration. IC Role / Device Role / Timing Role: Primary shunt regulator establishing 39 V reference for analog-to-digital conversion accuracy. Use Value: 14 Ω dynamic impedance ensures <0.5% output deviation during 100 mA load steps, meeting DO-254 Class A requirements.	Use Scenario: Stabilizing gate drive bias in solid-state relays used in offshore oil rig motor control cabinets. IC Role / Device Role / Timing Role: Overvoltage clamp and voltage limiter protecting MOSFET gate drivers from transients. Use Value: 4.0 A surge rating absorbs 8.3 ms line surges without failure, extending system MTBF beyond 100,000 hours.

Aerospace Power Conditioning

Radiation-Hardened Instrumentation

Use Scenario: Regulating auxiliary supply rails in satellite telemetry modules exposed to thermal cycling and vacuum.

IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage clamp in DC-DC converter feedback and protection circuitry.

Use Value: Maintains 39 V regulation within ±5% across –65 °C to +175 °C, eliminating need for active compensation.

Use Scenario: Providing stable bias voltage for analog front-end amplifiers in nuclear reactor monitoring sensors.

IC Role / Device Role / Timing Role: Precision shunt reference and transient suppressor in high-TID environments.

Use Value: Delivers <2 μA leakage at 29.7 V and survives >100 krad(Si) without parameter shift per MicroNote 050.

Military Avionics Voltage Reference

High-Reliability Industrial Control

Use Scenario: Generating reference voltage for ADCs in flight-critical navigation subsystems operating under extreme vibration.

IC Role / Device Role / Timing Role: Primary shunt regulator establishing 39 V reference for analog-to-digital conversion accuracy.

Use Value: 14 Ω dynamic impedance ensures <0.5% output deviation during 100 mA load steps, meeting DO-254 Class A requirements.

Use Scenario: Stabilizing gate drive bias in solid-state relays used in offshore oil rig motor control cabinets.

IC Role / Device Role / Timing Role: Overvoltage clamp and voltage limiter protecting MOSFET gate drivers from transients.

Use Value: 4.0 A surge rating absorbs 8.3 ms line surges without failure, extending system MTBF beyond 100,000 hours.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
JANTXV1N4972US	Higher screening level (JANTXV vs JANTX); tighter temp coefficient (±0.085 %/°C vs ±0.095 %/°C); same V_Z, package, and power rating	Required for programs demanding extended burn-in and radiation lot acceptance testing per MIL-PRF-19500/356 Appendix A	Select JANTXV1N4972US when full JANTXV qualification and enhanced parametric consistency are mandated
1N4972US	Commercial-grade version; no MIL-PRF-19500/356 qualification; identical electrical specs and package but lower screening and traceability	Suitable only for non-military industrial prototypes where cost sensitivity outweighs reliability assurance	Choose 1N4972US for early-stage development or non-critical subsystems where MIL-spec documentation is not required

Compared with JANTX1N4972US/TR, JANTXV1N4972US offers superior parametric consistency and radiation assurance for mission-critical avionics, while 1N4972US provides identical performance at lower cost for non-qualified industrial use - neither is pin-compatible with axial-leaded equivalents due to differing package geometry.

Availability

JANTX1N4972US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, radiation-hardened instrumentation, and military avionics requiring stable component supply with full traceability and MIL-PRF-19500/356 compliance.

Supply support for JANTX1N4972US/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 manufacturer specializing in high-reliability, radiation-tolerant, and defense-grade components.

The JANTX1N4972US/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener series designed specifically for aerospace, defense, and nuclear instrumentation applications demanding zero-failure operation.

FAQ

What is the Zener voltage tolerance for JANTX1N4972US/TR?

JANTX1N4972US/TR has a nominal Zener voltage of 39 V with a standard tolerance of ±5%, as defined in MIL-PRF-19500/356. This tolerance applies across the full operating temperature range of –65 °C to +175 °C and is verified during military screening. Tighter tolerances (e.g., ±2% or ±1%) require different suffixes (C or D) not present in the JANTX1N4972US/TR designation.

Does JANTX1N4972US/TR require derating above 140 °C case temperature?

Yes - JANTX1N4972US/TR must be linearly derated from 5 W at T_EC = 140 °C to 0 W at 175 °C. The derating slope is –35.7 mW/°C. This requirement stems from its thermal resistance of 7 °C/W junction-to-end-cap and is mandatory to prevent thermal runaway or metallurgical bond degradation per MIL-PRF-19500/356.

Is JANTX1N4972US/TR compatible with lead-free reflow processes?

No - JANTX1N4972US/TR features Sn/Pb (tin/lead) terminations and is not qualified for Pb-free reflow. Its end caps are specified with Sn/Pb finish per the datasheet, and exposure to peak temperatures >220 °C (typical for lead-free profiles) risks intermetallic formation and solder joint reliability loss. Use only with SnPb-compatible assembly processes.

What does the "TR" suffix indicate in JANTX1N4972US/TR?

The "TR" suffix in JANTX1N4972US/TR denotes tape-and-reel packaging per EIA-481-B standard. It specifies that the device is supplied in industry-standard carrier tape with 500 units per reel, enabling automated SMT placement. This packaging format is distinct from bulk or ammo-pack options and is required for high-volume manufacturing lines.

Can JANTX1N4972US/TR be used as a forward-biased rectifier?

JANTX1N4972US/TR is optimized for reverse-bias Zener operation and is not characterized for continuous forward conduction. While its forward voltage is specified as 1.50 V at 1.0 A, it lacks rated average forward current or surge ratings in forward mode. Using it as a rectifier violates its design intent and may cause premature failure - dedicated rectifiers should be selected instead.

JANTX1N4972CUS/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):: 39 V

Tolerance:: ±2%

Power - Max:: 5 W

Impedance (Max) (Zzt):: 14 Ohms

Current - Reverse Leakage @ Vr:: 2 µA @ 29.7 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

JANTX1N4972CUS/TR FAQ

1.How can I place an order for JANTX1N4972CUS/TR through Aetrix?

Please submit a Request for Quotation (RFQ) for JANTX1N4972CUS/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 JANTX1N4972CUS/TR reliable?

The price and inventory of JANTX1N4972CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4972CUS/TR is usually 5 days.

3.What payment methods are accepted for JANTX1N4972CUS/TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4972CUS/TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for JANTX1N4972CUS/TR?

JANTX1N4972CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your JANTX1N4972CUS/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 JANTX1N4972CUS/TR?

For technical support, including JANTX1N4972CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4972CUS/TR requirements.

6.How does Aetrix verify that JANTX1N4972CUS/TR is sourced from the original manufacturer or authorized distributors?

All JANTX1N4972CUS/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 JANTX1N4972CUS/TR meets industry standards.

7.What is the process for return or replacement of JANTX1N4972CUS/TR?

All JANTX1N4972CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4972CUS/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 JANTX1N4972CUS/TR part is unused and in its original packaging.

Return procedure for JANTX1N4972CUS/TR:

1.Submit a request within 90 days.

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

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