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Microchip Technology JANTX1N4976US/TR
- Part No.:
- JANTX1N4976US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4976US/TR.pdf
- Description:
- DIODE ZENER 56V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:4,724
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Product details
Overview
JANTX1N4976US/TR from Microsemi is a military-grade, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with a nominal Zener voltage of 56 V ±5%, dynamic impedance of 35 Ω at 25 mA test current, and operating junction temperature range of −65 °C to +175 °C. It serves as a precision voltage reference and overvoltage clamp in high-reliability aerospace power conditioning circuits.
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 regulation where radiation hardness, ESD immunity per MIL-STD-750 Method 1020, and long-term parametric stability under thermal cycling are mandatory design requirements.
Technical Context
This device belongs to the MIL-PRF-19500/356 qualified 1N4954US–1N4996US series, featuring voidless hermetic glass construction with internal Category I metallurgical bonds and triple-layer passivation. Its Zener breakdown mechanism delivers stable regulation across 10%–50% of maximum Zener current (IZM), with voltage change ΔVZ ≤ 4.4 V over that range.
The JANTX1N4976US/TR exhibits a temperature coefficient αVZ of +0.095 %/°C at 25 °C and 25 mA, enabling predictable drift compensation in wide-temperature-range designs. Its 7 °C/W junction-to-end-cap thermal resistance supports reliable 5 W operation when mounted on thermally optimized PCB pads per D-5B footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 56 V ±5% at IZT = 25 mA - defines regulated output level in shunt regulator topologies |
| Power Dissipation PD | 5 W @ TEC = 140 °C - sets maximum continuous power handling before thermal derating begins |
| Dynamic Impedance ZZ | 35 Ω @ IZT = 25 mA - determines output voltage ripple rejection under load transients |
| Max Reverse Leakage IR | 2 μA @ VR = 42.6 V - ensures minimal standby current in high-impedance bias networks |
| Junction Temp Range | −65 °C to +175 °C - enables operation in extended-environment avionics and downhole electronics |
| Thermal Resistance θJC | 7 °C/W junction-to-end-cap - requires direct thermal pad connection to PCB copper for full 5 W rating |
| Surge Current IZSM | 2.8 A @ 8.3 ms - withstands short-duration line transients without degradation |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), with copper end caps finished in Sn/Pb, cathode indicated by band, and polarity-aligned for surface-mount placement. Weight: 539 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in shunt regulation; must sink full load current during fault conditions |
| Cathode | Zener breakdown terminal | Connected to regulated voltage rail; band-marked end cap provides visual polarity identification |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and parametric drift over 20+ year service life in vacuum or humid environments |
| Category I metallurgical bond | Ensures mechanical integrity and low-resistance interface between silicon die and tungsten slug under shock/vibration |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for external ESD protection circuitry in handling and assembly |
| Inherent radiation hardness | Validated per MicroNote 050 for total ionizing dose (TID) up to 100 krad(Si), suitable for LEO missions |
| Tape-and-reel packaging (EIA-481-B) | Enables automated SMT placement without manual handling or contamination risk |
Applications
| Aerospace Power Bus Clamp | Avionics Reference Voltage Source |
|---|---|
Use Scenario: Clamping transient overvoltages on 28 V DC aircraft bus during load dump events. IC Role / Device Role / Timing Role: Shunt voltage limiter placed across bus input to divert surge energy into ground. Use Value: Withstands 2.8 A 8.3 ms surges and maintains clamping at 56 V ±5%, protecting downstream FPGAs and ADCs. |
Use Scenario: Providing stable 56 V reference for analog-to-digital conversion in flight control sensor interfaces. IC Role / Device Role / Timing Role: Precision Zener reference in ratiometric measurement circuits with low-drift op-amps. Use Value: Temperature coefficient of +0.095 %/°C allows predictable calibration offset correction across −55 °C to +125 °C ambient. |
| Satellite Power Converter Feedback | Military Radar Bias Supply |
Use Scenario: Voltage feedback element in isolated DC-DC converter secondary-side regulation loop. IC Role / Device Role / Timing Role: Zener reference referenced to isolated ground, feeding optocoupler error amplifier input. Use Value: Hermetic seal prevents parameter shift in vacuum; 7 °C/W θJC enables thermal coupling to heatsink via end-cap soldering. |
Use Scenario: High-stability bias supply for GaN RF power amplifier gate drivers in ground-based radar transmitters. IC Role / Device Role / Timing Role: Primary voltage reference setting quiescent current and gain in multi-stage amplifiers. Use Value: Radiation hardness and −65 °C to +175 °C operation ensure uninterrupted performance during rapid thermal cycling in desert deployments. |
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 vs JANTX); tighter test limits per MIL-PRF-19500/356, including extended burn-in and parametric retest | Required for Class H (spaceflight) and Class K (nuclear-hardened) programs where zero defect tolerance applies | Select JANTXV1N4976US only if program specification mandates JANTXV-level qualification; otherwise JANTX1N4976US meets standard MIL-SPEC requirements. |
| 1N4976US | Commercial-grade version; same electrical specs but no MIL-PRF-19500/356 qualification, no radiation data, and no ESD testing per MIL-STD-750 | Suitable for non-mission-critical industrial controls or lab equipment where cost sensitivity outweighs reliability assurance | Choose 1N4976US only for prototyping or commercial systems with no environmental or lifetime requirements; not acceptable for defense/aerospace BOMs. |
Compared with JANTXV1N4976US, the JANTX1N4976US offers identical Zener voltage, power, and thermal performance but with reduced screening rigor-making it optimal for tactical-grade avionics where JANTXV's added cost and lead time are unjustified. Against 1N4976US, it adds verified radiation hardness, ESD immunity, and hermetic reliability essential for deployed military platforms.
Availability
JANTX1N4976US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, avionics reference design, and military radar bias supply 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) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
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?
The 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 25 °C and 25 mA test current, and is confirmed in the SD44A datasheet revision E. Tighter tolerances (±2% or ±1%) require different suffixes (C or D) not present in the JANTX1N4976US/TR part number.
Does JANTX1N4976US/TR require heatsinking for 5 W operation?
Yes-JANTX1N4976US/TR achieves its full 5 W power rating only when the end-cap temperature (TEC) is maintained at ≤140 °C. This requires direct thermal conduction from both end caps to adequately sized PCB copper pads per the D-5B footprint, as specified in the SD44A datasheet. Without thermal pad coupling, derating is mandatory above 140 °C.
Is JANTX1N4976US/TR radiation hardened?
Yes-the JANTX1N4976US/TR is inherently radiation hard, with characterization documented in Microsemi MicroNote 050. It is qualified for total ionizing dose (TID) up to 100 krad(Si), making it suitable for low-Earth orbit (LEO) satellite power systems without additional shielding or mitigation.
What is the forward voltage of JANTX1N4976US/TR?
The forward voltage of JANTX1N4976US/TR is 1.50 V at 1.0 A forward current, as specified in the Maximum Ratings table of the SD44A datasheet. This value reflects the diode's silicon junction behavior and is relevant for reverse-polarity protection or crowbar circuit design using the anode-cathode path.
Can JANTX1N4976US/TR be used in place of JANTXV1N4976US?
JANTX1N4976US/TR is not a drop-in replacement for JANTXV1N4976US. While electrically identical, JANTXV includes extended screening (burn-in, parametric retest, lot acceptance testing) per MIL-PRF-19500/356 Class V requirements. Substitution requires formal waiver approval in programs specifying JANTXV-level reliability.
JANTX1N4976US/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:
- ±5%
- 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
JANTX1N4976US/TR FAQ
1.How can I place an order for JANTX1N4976US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4976US/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 JANTX1N4976US/TR reliable?
The price and inventory of JANTX1N4976US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4976US/TR is usually 5 days.
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Once your JANTX1N4976US/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 JANTX1N4976US/TR?
For technical support, including JANTX1N4976US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4976US/TR requirements.
6.How does Aetrix verify that JANTX1N4976US/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4976US/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 JANTX1N4976US/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4976US/TR?
All JANTX1N4976US/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4976US/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 JANTX1N4976US/TR part is unused and in its original packaging.
Return procedure for JANTX1N4976US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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