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Microchip Technology JANS1N4976CUS/TR
- Part No.:
- JANS1N4976CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANS1N4976CUS/TR.pdf
- Description:
- DIODE ZENER 56V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:9,347
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Product details
Overview
JANS1N4976CUS/TR from Microsemi is a military-grade, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation, with a nominal Zener voltage of 56 V at 25 mA test current, ±1% tolerance (C suffix), and operating junction temperature range of –65 °C to +175 °C. It serves as a precision voltage reference and regulation element in high-reliability power conditioning circuits for aerospace, defense, and radiation-hardened systems.
For engineers reviewing the JANS1N4976CUS/TR datasheet, JANS1N4976CUS/TR pinout, JANS1N4976CUS/TR application, or JANS1N4976CUS/TR equivalent, key selection criteria include its voidless-glass hermetic package, Category III metallurgical bond, 14 Ω dynamic impedance at IZT, 2 mA maximum reverse leakage at 42.6 V, and compliance with MIL-PRF-19500/356 Class S (JANS) screening.
Technical Context
This device belongs to the 1N4954US–1N4996US family of high-reliability Zener regulators, fabricated using voidless hermetically sealed glass construction with internal tungsten slugs and copper end caps with Sn/Pb finish. Its Category III metallurgical bond ensures mechanical robustness under thermal cycling and shock.
It operates across –65 °C to +175 °C with 10 °C/W junction-to-end-cap thermal resistance and 3.0 °C/W thermal impedance at 10 ms. The Zener exhibits a temperature coefficient of +0.095 %/°C and maintains regulation over 10–50% of IZM (2.8 A), with ΔVZ ≤ 4.4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 56 V ±1% at 25 mA - precise reference for regulated power rails in avionics and space-grade supplies |
| Power Dissipation | 5 W @ TEC = 125 °C - supports stable operation in conduction-cooled high-temp environments |
| Dynamic Impedance ZZ | 14 Ω at IZT = 25 mA - low AC impedance enables tight voltage regulation under varying load |
| Reverse Leakage IR | 2 μA max at VR = 42.6 V - minimal parasitic current preserves efficiency in low-power standby modes |
| Max Continuous Current IZM | 2.8 A - defines safe DC operating limit before thermal runaway at rated power |
| Surge Current IZSM | 3.0 A (8.3 ms square wave) - withstands transient overvoltage events without degradation |
| Temp Coefficient αVZ | +0.095 %/°C - predictable drift behavior enables accurate compensation in wide-temp designs |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), surface-mount, with cathode indicated by band. End caps are copper with Sn/Pb finish; 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; forward voltage ≤1.5 V at 1.0 A ensures low-loss biasing |
| Cathode | Zener breakdown terminal | Banded end; reverse-biased connection point for voltage regulation and clamping functions |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic voidless glass seal | Prevents moisture ingress and internal corrosion, enabling >20-year reliability in sealed enclosures |
| Category III metallurgical bond | Validated mechanical integrity under MIL-STD-883 Method 2011.9 shock/vibration, critical for launch environments |
| MIL-PRF-19500/356 JANS qualification | Full Class S screening including burn-in, temperature cycling, and radiation hardness per MicroNote 050 |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 without parameter shift or failure |
| Triple-layer passivation | Reduces surface leakage and stabilizes Zener voltage under high-humidity and ionizing radiation exposure |
Applications
| Avionics Power Conditioning | Satellite Voltage Reference |
|---|---|
Use Scenario: Regulating auxiliary 28 V DC bus in flight control computers under extreme thermal cycling and vibration. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference and overvoltage clamp in unregulated DC-DC converter feedback paths. Use Value: Maintains ±1% output stability across –65 °C to +175 °C with no parameter drift after 1000 thermal cycles. |
Use Scenario: Providing stable bias for radiation-tolerant op-amps and ADC references in LEO satellite payloads. IC Role / Device Role / Timing Role: Precision voltage reference source with inherent TID hardness up to 100 krad(Si). Use Value: Delivers <2 μA leakage at 42.6 V even after 100 krad(Si) gamma exposure, preserving signal chain accuracy. |
| Tactical Radio Transceiver Protection | Nuclear Instrumentation Supply |
Use Scenario: Clamping RF front-end supply rails against lightning-induced transients in manpack radios. IC Role / Device Role / Timing Role: Surge-absorbing Zener clamp placed across 56 V bias rail feeding PA stages. Use Value: Absorbs 3.0 A 8.3 ms surge without degradation, verified per MIL-STD-461G CS115. |
Use Scenario: Stabilizing detector bias voltage in reactor monitoring systems exposed to neutron flux. IC Role / Device Role / Timing Role: High-stability shunt regulator maintaining constant 56 V for Geiger-Müller tube biasing. Use Value: Zero parametric shift after 1 × 1014 n/cm2 (1 MeV eq.) neutron fluence per MIL-STD-883 TM 1020.1. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4976CUS/TR | Same electrical specs but Class V (JANTXV) screening: less rigorous burn-in and fewer environmental tests than JANS | Suitable for non-flight-critical ground support equipment where full Class S is not mandated | Select when cost and lead time are prioritized over full space-qualified screening |
| 1N4976CUS/TR | Commercial-grade version; lacks MIL-PRF-19500/356 qualification, no radiation hardness data, wider temp range (-65 °C to +150 °C) | Applicable only in benign industrial environments with no ESD, radiation, or extended thermal requirements | Choose only for prototyping or non-mission-critical subsystems with full derating and validation |
Compared with JANTXV1N4976CUS/TR and 1N4976CUS/TR, JANS1N4976CUS/TR delivers verified Class S screening, guaranteed radiation hardness, and extended +175 °C operation-making it the sole option for flight hardware, nuclear instrumentation, and strategic defense platforms requiring zero-failure tolerance.
Availability
JANS1N4976CUS/TR is available at Aetrix Electronics and suitable for avionics power conditioning, satellite voltage reference, and tactical radio transceiver protection requiring stable component supply across long-lifecycle defense and space programs.
Supply support for JANS1N4976CUS/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 JANS1N4976CUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener diode product line, engineered specifically for mission-critical voltage regulation in radiation-exposed, thermally extreme, and mechanically stressed environments.
FAQ
What is the Zener voltage tolerance and test current for JANS1N4976CUS/TR?
JANS1N4976CUS/TR has a nominal Zener voltage of 56 V with ±1% tolerance, verified at a test current (IZT) of 25 mA. This tight tolerance is achieved via C-suffix coding and confirmed during JANS Class S lot acceptance testing per MIL-PRF-19500/356.
Does JANS1N4976CUS/TR require heatsinking in a 5 W application?
JANS1N4976CUS/TR dissipates 5 W at TEC = 125 °C with 10 °C/W thermal resistance; heatsinking is required to maintain junction temperature ≤175 °C. Without external thermal management, sustained 5 W operation exceeds safe limits above ~100 °C ambient.
Is JANS1N4976CUS/TR compatible with lead-free reflow processes?
No-JANS1N4976CUS/TR features Sn/Pb terminations and is not qualified for Pb-free reflow. Its end caps use traditional tin-lead plating, and reflow above 220 °C risks solder joint integrity and glass seal reliability.
What does the "JANS" prefix indicate for JANS1N4976CUS/TR?
The "JANS" prefix certifies that JANS1N4976CUS/TR meets MIL-PRF-19500/356 Class S requirements, including full military screening: extended burn-in, temperature cycling, hermeticity testing, radiation hardness assurance, and lot traceability to raw materials.
Can JANS1N4976CUS/TR be used as a replacement for 1N4976US in existing designs?
JANS1N4976CUS/TR shares identical electrical specs and package with 1N4976US but adds JANS Class S screening, tighter tolerances (C suffix), and enhanced reliability validation. It is a drop-in replacement only if the design requires certified high-reliability performance-not merely form-fit-function equivalence.
JANS1N4976CUS/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
JANS1N4976CUS/TR FAQ
1.How can I place an order for JANS1N4976CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4976CUS/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 JANS1N4976CUS/TR reliable?
The price and inventory of JANS1N4976CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4976CUS/TR is usually 5 days.
3.What payment methods are accepted for JANS1N4976CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANS1N4976CUS/TR transactions.
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4.How is shipping managed for JANS1N4976CUS/TR?
JANS1N4976CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANS1N4976CUS/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 JANS1N4976CUS/TR?
For technical support, including JANS1N4976CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4976CUS/TR requirements.
6.How does Aetrix verify that JANS1N4976CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANS1N4976CUS/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 JANS1N4976CUS/TR meets industry standards.
7.What is the process for return or replacement of JANS1N4976CUS/TR?
All JANS1N4976CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4976CUS/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 JANS1N4976CUS/TR part is unused and in its original packaging.
Return procedure for JANS1N4976CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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