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Microchip Technology JANTX1N4976DUS/TR
- Part No.:
- JANTX1N4976DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4976DUS/TR.pdf
- Description:
- DIODE ZENER 56V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:9,404
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Product details
Overview
JANTX1N4976DUS/TR from Microsemi is a military-qualified, hermetically sealed surface-mount 5 W Zener diode with nominal Zener voltage of 56 V, ±5% tolerance, 35 mA test current, and 320 Ω dynamic impedance at IZT. It operates from –65 °C to +175 °C and delivers stable voltage regulation in high-reliability power supply and reference circuits for aerospace and defense systems.
For engineers reviewing the JANTX1N4976DUS/TR datasheet, JANTX1N4976DUS/TR pinout, JANTX1N4976DUS/TR application, or JANTX1N4976DUS/TR equivalent, key selection criteria include its voidless-glass package, Category I metallurgical bond, 5 W power rating at TEC = 140 °C, radiation-hardened construction, and MIL-PRF-19500/356 qualification.
Technical Context
This device functions as a precision shunt voltage regulator in feedback loops and overvoltage protection paths. Its Zener breakdown mechanism provides stable reverse-biased regulation across 10%–50% of IZM, with ΔVZ ≤ 4.4 V and temperature coefficient αVZ = ±0.095 %/°C at IZT.
The "DUS" suffix denotes surface-mount "E" (D-5B) package with copper end caps and Sn/Pb finish; "TR" indicates tape-and-reel packaging per EIA-481-B. Cathode polarity is marked by a band, and forward voltage is specified at 1.50 V @ 1.0 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 56 V ±5% at IZT = 25 mA - defines regulated output voltage under nominal bias |
| Power Dissipation | 5 W @ TEC = 140 °C - sets maximum continuous thermal load without derating |
| Dynamic Impedance ZZ | 320 Ω @ IZT = 25 mA - determines regulation sensitivity to current variation |
| Max Reverse Leakage IR | 2 μA @ VR = 42.6 V - ensures low standby power loss in high-impedance bias networks |
| Operating Temperature | –65 °C to +175 °C - enables deployment in extreme-environment avionics and downhole electronics |
| Thermal Resistance θJC | 7 °C/W junction-to-end-cap - informs heatsinking requirements for sustained 5 W operation |
| Surge Current IZSM | 2.8 A @ 8.3 ms - supports transient overvoltage clamping in MIL-STD-1275-compliant systems |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), with copper end caps and Sn/Pb termination finish. Weight: 539 mg. Polarity: Cathode indicated by band. Tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lowest potential point in shunt regulation path |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 56 V reference when biased above VZ; marked by band |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and long-term parameter drift in 10+ year mission-critical deployments |
| Category I metallurgical bond | Ensures mechanical integrity and thermal cycling reliability up to 1000 cycles between –65 °C and +175 °C |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for on-board ESD protection circuitry in handling and assembly |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 for total ionizing dose (TID) > 100 krad(Si) |
| Triple-layer passivation | Suppresses surface leakage and enhances stability in high-humidity or contaminated environments |
Applications
| Aerospace Power Conditioning | Defense System Reference |
|---|---|
Use Scenario: Regulating auxiliary 28 V DC bus voltage in satellite power distribution units. IC Role / Device Role / Timing Role: Shunt voltage reference and overvoltage clamp in primary feedback loop of isolated DC-DC converter. Use Value: Maintains ±1.5% output accuracy over –40 °C to +85 °C ambient with no calibration, leveraging 56 V Zener's low αVZ and tight tolerance. |
Use Scenario: Providing stable bias voltage for analog front-end amplifiers in radar receiver modules. IC Role / Device Role / Timing Role: Precision voltage reference for ADC driver stages and gain-setting networks. Use Value: Delivers <2 μA leakage at 42.6 V, minimizing input offset error and enabling 16-bit effective resolution. |
| Tactical Vehicle Electronics | Downhole Telemetry Systems |
Use Scenario: Overvoltage protection for 24 V CAN bus transceivers subjected to load-dump transients. IC Role / Device Role / Timing Role: Clamping diode in TVS-assisted protection network upstream of transceiver IC. Use Value: Absorbs 2.8 A surge (8.3 ms) without degradation, meeting MIL-STD-1275B Class V requirements. |
Use Scenario: Voltage reference for pressure sensor signal conditioning in oil/gas well logging tools. IC Role / Device Role / Timing Role: Stable excitation source for Wheatstone bridge sensors operating at 175 °C downhole. Use Value: Sustains regulation performance across full –65 °C to +175 °C range with no parameter shift beyond spec limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4976DUS/TR | Higher screening level (JANTXV vs JANTX); tighter tempco (±0.085 %/°C vs ±0.095 %/°C); same VZ, PD, package | Required for programs demanding extended burn-in, radiation testing, or enhanced lot traceability | Select JANTXV1N4976DUS/TR when MIL-PRF-19500/356 Class V screening is mandated |
| 1N4976US | Commercial-grade version; no MIL-PRF-19500 qualification; wider tempco (±0.100 %/°C); same electrical specs and D-5B package | Suitable only for non-military industrial applications where radiation hardness and extreme temperature operation are not required | Choose 1N4976US for cost-sensitive prototypes or commercial subsystems with <125 °C max ambient |
Compared with JANTX1N4976DUS/TR, JANTXV1N4976DUS/TR offers superior parametric stability and screening rigor for space-grade designs, while 1N4976US reduces cost and lead time for terrestrial industrial use-neither is pin-compatible with other Zener families due to unique D-5B mechanical footprint.
Availability
JANTX1N4976DUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, defense system reference, and tactical vehicle electronics requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for JANTX1N4976DUS/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-hardened, and military-qualified analog and discrete components.
The JANTX1N4976DUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener diode family, engineered for fail-safe voltage regulation in mission-critical avionics, defense electronics, and space systems.
FAQ
What is the Zener voltage tolerance and test current for JANTX1N4976DUS/TR?
JANTX1N4976DUS/TR has a nominal Zener voltage of 56 V with ±5% tolerance, measured at a test current IZT of 25 mA. This tolerance reflects the initial calibration limit under standard conditions and is verified per MIL-PRF-19500/356 screening requirements. The JANTX1N4976DUS/TR maintains this specification across its full operating temperature range.
Does JANTX1N4976DUS/TR require external heat sinking in 5 W operation?
JANTX1N4976DUS/TR is rated for 5 W dissipation at an end-cap temperature (TEC) of 140 °C, with a junction-to-end-cap thermal resistance of 7 °C/W. In practice, it requires a thermally robust PCB layout-such as copper pour under the end caps-but does not mandate discrete heat sinks for typical 5 W continuous use. Derating begins linearly above 140 °C TEC, reaching zero at 175 °C.
Is JANTX1N4976DUS/TR compatible with lead-free reflow processes?
JANTX1N4976DUS/TR features Sn/Pb (tin/lead) terminations and is not qualified for Pb-free reflow. Its end-cap finish and glass seal are optimized for eutectic solder profiles. For RoHS-compliant designs, engineers must select alternate qualified parts or verify compatibility with controlled Pb-free thermal profiles through Microchip's application engineering support for JANTX1N4976DUS/TR.
How does the radiation hardness of JANTX1N4976DUS/TR benefit satellite applications?
JANTX1N4976DUS/TR exhibits inherent radiation hardness validated per Microsemi MicroNote 050, supporting total ionizing dose (TID) tolerance exceeding 100 krad(Si). This allows uninterrupted voltage reference stability in low-Earth orbit missions without shielding overhead or redundant regulation-critical for maintaining JANTX1N4976DUS/TR performance in solar array regulators and telemetry power supplies.
What is the meaning of the "DUS" and "TR" suffixes in JANTX1N4976DUS/TR?
The "DUS" suffix identifies the "E" (D-5B) surface-mount glass package with copper end caps and Sn/Pb finish; "TR" denotes tape-and-reel packaging per EIA-481-B. These suffixes are integral to JANTX1N4976DUS/TR's mechanical and logistics identity-"DUS" confirms the voidless hermetic construction required for MIL-PRF-19500/356 compliance, and "TR" enables automated placement in high-volume defense manufacturing.
JANTX1N4976DUS/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:
- ±1%
- 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
JANTX1N4976DUS/TR FAQ
1.How can I place an order for JANTX1N4976DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4976DUS/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 JANTX1N4976DUS/TR reliable?
The price and inventory of JANTX1N4976DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4976DUS/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4976DUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4976DUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTX1N4976DUS/TR?
JANTX1N4976DUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4976DUS/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 JANTX1N4976DUS/TR?
For technical support, including JANTX1N4976DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4976DUS/TR requirements.
6.How does Aetrix verify that JANTX1N4976DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4976DUS/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 JANTX1N4976DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4976DUS/TR?
All JANTX1N4976DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4976DUS/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 JANTX1N4976DUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4976DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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