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Microchip Technology JANTXV1N4976CUS/TR
- Part No.:
- JANTXV1N4976CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTXV1N4976CUS/TR.pdf
- Description:
- DIODE ZENER 56V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:3,894
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Product details
Overview
JANTXV1N4976CUS/TR from Microsemi is a surface-mount, hermetically sealed, voidless-glass 5 W Zener diode rated for 51 V nominal Zener voltage at 25 mA test current, with ±1% tolerance (C suffix), 1.5 V forward voltage at 1.0 A, and operating junction temperature range of −65 °C to +175 °C. It serves as a precision voltage reference and overvoltage clamp in high-reliability military power regulation circuits.
For engineers reviewing the JANTXV1N4976CUS/TR datasheet, JANTXV1N4976CUS/TR pinout, JANTXV1N4976CUS/TR application, or JANTXV1N4976CUS/TR equivalent, this part is selected for demanding aerospace, defense, and downhole instrumentation where radiation hardness, ESD immunity, and long-term parametric stability under thermal cycling are mandatory.
Technical Context
This device belongs to the MIL-PRF-19500/356 qualified 1N49xxUS series, featuring internal Category I metallurgical bonds and triple-layer passivation for enhanced reliability. Its voidless-glass hermetic seal eliminates moisture ingress and prevents parameter drift under extreme thermal and mechanical stress.
The JANTXV1N4976CUS/TR operates with a dynamic impedance of 27 Ω at 25 mA and exhibits a temperature coefficient of +0.095 %/°C - enabling stable regulation across wide ambient ranges without external compensation. Surge capability reaches 3.0 A (8.3 ms square wave) with thermal resistance of 10 °C/W junction-to-end-cap.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V ±1% at 25 mA - enables precise 51 V rail clamping or reference generation with minimal calibration overhead |
| Power Dissipation | 5 W @ TEC = 125 °C - supports continuous operation in conduction-cooled PCB layouts up to 125 °C end-cap temperature |
| Dynamic Impedance (ZZ) | 27 Ω at IZT = 25 mA - ensures low output impedance for tight regulation under load transients |
| Reverse Leakage (IR) | 2 μA max at 40.8 V - guarantees negligible standby current in high-impedance bias networks |
| Forward Voltage (VF) | 1.5 V max at 1.0 A - allows use as bidirectional transient suppressor when paired with series resistor |
| Temp. Coefficient (αVZ) | +0.095 %/°C - predictable positive drift simplifies system-level thermal error budgeting |
| Surge Current (IZSM) | 3.0 A (8.3 ms sq. wave) - withstands lightning-induced transients per MIL-STD-461 CS115 |
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, weight 539 mg. Tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink in reverse breakdown; forward conduction path | Connected to system ground or low-impedance return to enable Zener regulation or clamping |
| Cathode | Regulated output node in reverse bias; anode connection in forward bias | Connected to protected rail or reference node; polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture-induced parameter shift and corrosion failure modes over 20+ year service life |
| Category I metallurgical bond | Ensures mechanical integrity under shock/vibration per MIL-STD-883 Method 2002 |
| Triple-layer passivation | Prevents surface leakage and contamination-induced breakdown degradation |
| Nonsensitive to ESD | Qualified to MIL-STD-750 Method 1020 - no handling precautions required beyond standard ESD-safe protocols |
| Inherent radiation hardness | Validated per MicroNote 050 - suitable for space-qualified systems without additional shielding |
Applications
| Aerospace Power Bus Protection | Military Avionics Reference |
|---|---|
Use Scenario: Clamping 28 V DC aircraft bus against load dump transients exceeding 100 V. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector in primary power distribution. Use Value: Withstands 3.0 A surge (8.3 ms) and maintains <2 μA leakage at 40.8 V, preventing false trips during normal operation. |
Use Scenario: Providing stable 51 V reference for analog-to-digital converter bias in radar signal conditioning. IC Role / Device Role / Timing Role: Precision voltage reference element in high-resolution data acquisition front-end. Use Value: ±1% tolerance and +0.095 %/°C TC enable <±0.5% total error over −55 °C to +125 °C without trimming. |
| Downhole Oilfield Instrumentation | Nuclear Reactor Control Monitoring |
Use Scenario: Regulating sensor excitation voltage in borehole pressure transducers exposed to 175 °C ambient. IC Role / Device Role / Timing Role: High-temperature Zener regulator maintaining constant bias for piezoresistive elements. Use Value: Guaranteed operation to +175 °C junction temperature and 10 °C/W thermal resistance allow direct mounting on ceramic substrates. |
Use Scenario: Voltage clamping in neutron detector pulse-shaping circuits within reactor containment. IC Role / Device Role / Timing Role: Radiation-hardened transient suppressor protecting front-end amplifiers from gamma-induced spikes. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for derating or shielding in Class 1E safety systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4976US | Same 51 V rating and package, but ±5% tolerance (no C suffix); higher leakage (5 μA max at 40.8 V) | Suitable for non-critical clamping where cost sensitivity outweighs precision | Select JANTXV1N4976US only if ±5% regulation accuracy is acceptable and leakage margin >2 μA is available |
| CDLL5100 | Commercial-grade 51 V Zener (±5%), plastic SOD-123 package, 1 W rating, not radiation-hardened | Limited to benign environments; cannot meet MIL-PRF-19500/356 or extended temperature requirements | CDLL5100 is not a drop-in replacement - requires layout change, derating for power, and requalification for radiation/temperature |
Compared with JANTXV1N4976US and CDLL5100, the JANTXV1N4976CUS/TR delivers tighter tolerance, lower leakage, full military qualification, and proven radiation hardness - making it the sole choice for Class H, Class K, or space-grade designs requiring guaranteed performance at 175 °C.
Availability
JANTXV1N4976CUS/TR is available at Aetrix Electronics and suitable for aerospace power protection, military avionics reference, and downhole instrumentation requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTXV1N4976CUS/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, radiation-hardened, and military-qualified components for aerospace, defense, and industrial markets.
The JANTXV1N4976CUS/TR belongs to Microsemi's legacy 1N49xxUS Zener family, engineered specifically for mission-critical voltage regulation where failure is not an option - including satellite power systems, fighter jet avionics, and nuclear instrumentation.
FAQ
What is the Zener voltage tolerance of JANTXV1N4976CUS/TR?
The JANTXV1N4976CUS/TR has a nominal Zener voltage of 51 V with ±1% tolerance, indicated by the "C" suffix in the part number. This is verified per MIL-PRF-19500/356 testing at 25 °C and 25 mA, and remains stable across its full operating temperature range due to its +0.095 %/°C temperature coefficient.
Is JANTXV1N4976CUS/TR compatible with lead-free soldering processes?
JANTXV1N4976CUS/TR features Sn/Pb-finished copper end caps and is qualified for traditional eutectic solder reflow. While not lead-free process qualified, its hermetic glass construction tolerates peak temperatures up to 260 °C for ≤10 seconds - allowing compatibility with controlled lead-free profiles when validated per J-STD-020.
Does JANTXV1N4976CUS/TR require derating above 125 °C?
Yes - JANTXV1N4976CUS/TR is rated for 5 W at TEC = 125 °C and must be linearly derated to zero at 175 °C. Its 10 °C/W junction-to-end-cap thermal resistance means each 1 °C rise above 125 °C reduces allowable power by 50 mW, requiring careful thermal design in high-ambient applications.
How is polarity identified on JANTXV1N4976CUS/TR?
JANTXV1N4976CUS/TR uses a cathode band marking on the glass body to identify the cathode terminal. The anode is the unmarked end cap. This polarity must be observed in circuit layout to ensure correct reverse-bias operation for Zener regulation or clamping functions.
What is the maximum surge current rating for JANTXV1N4976CUS/TR?
JANTXV1N4976CUS/TR is rated for a non-repetitive maximum Zener surge current (IZSM) of 3.0 A at 8.3 ms square wave, per MIL-STD-750 Method 3011. This rating applies under specified test conditions and supports compliance with transient immunity standards such as DO-160 Section 22 and MIL-STD-461 CS115.
JANTXV1N4976CUS/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
JANTXV1N4976CUS/TR FAQ
1.How can I place an order for JANTXV1N4976CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTXV1N4976CUS/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 JANTXV1N4976CUS/TR reliable?
The price and inventory of JANTXV1N4976CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTXV1N4976CUS/TR is usually 5 days.
3.What payment methods are accepted for JANTXV1N4976CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTXV1N4976CUS/TR transactions.
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4.How is shipping managed for JANTXV1N4976CUS/TR?
JANTXV1N4976CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTXV1N4976CUS/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 JANTXV1N4976CUS/TR?
For technical support, including JANTXV1N4976CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTXV1N4976CUS/TR requirements.
6.How does Aetrix verify that JANTXV1N4976CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTXV1N4976CUS/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 JANTXV1N4976CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTXV1N4976CUS/TR?
All JANTXV1N4976CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTXV1N4976CUS/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 JANTXV1N4976CUS/TR part is unused and in its original packaging.
Return procedure for JANTXV1N4976CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JANTXV1N4976CUS/TR Tags
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