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Microchip Technology JANTX1N4956CUS/TR
- Part No.:
- JANTX1N4956CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4956CUS/TR.pdf
- Description:
- DIODE ZENER 8.2V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:8,994
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Product details
Overview
JANTX1N4956CUS/TR from Microsemi is a surface-mount, voidless-hermetically-sealed 5 W glass Zener diode with nominal Zener voltage of 8.2 V, ±5% tolerance (C suffix), and 150 mA test current (IZT). It operates from −65 °C to +175 °C and delivers stable voltage regulation in high-reliability military power conditioning circuits.
For engineers reviewing the JANTX1N4956CUS/TR datasheet, JANTX1N4956CUS/TR pinout, JANTX1N4956CUS/TR application, or JANTX1N4956CUS/TR equivalent, key selection criteria include its MIL-PRF-19500/356 qualification, 5 W power rating at 140 °C end-cap temperature, 1.5 V forward voltage at 1.0 A, and hermetic glass package with tungsten slugs for radiation-hardened environments.
Technical Context
This device functions as a precision shunt voltage regulator in DC power rails where failure tolerance is critical. Its Zener breakdown mechanism provides stable reference voltage across a broad operating current range (10–50% of IZM) and exhibits low dynamic impedance (600 Ω at IZT = 150 mA) and tight voltage regulation (ΔVZ ≤ 0.7 V).
The "E" package (D-5B) uses copper end caps with Sn/Pb finish and cathode band polarity marking. Thermal resistance is 7 °C/W junction-to-end-cap, enabling reliable operation up to 175 °C junction temperature with linear derating above 140 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V nominal at 150 mA - sets regulated output voltage in shunt configuration |
| Power Dissipation | 5 W @ TEC = 140 °C - defines maximum continuous thermal load before derating |
| Dynamic Impedance (ZZ) | 600 Ω @ IZT - determines output voltage stability under load transients |
| Reverse Leakage (IR) | 50 μA @ VR = 6.2 V - limits standby current in high-impedance bias networks |
| Forward Voltage (VF) | 1.5 V @ 1.0 A - enables use as clamping diode in surge protection paths |
| Temp Coefficient (αVZ) | +0.06 %/°C - quantifies drift over temperature for precision reference designs |
| Max Surge Current | 24 A @ 8.3 ms - supports transient overvoltage suppression without failure |
Pinout & Package
The JANTX1N4956CUS/TR uses the "E" package (also designated D-5B), a surface-mount hermetic glass case with tungsten slugs and copper end caps finished with Sn/Pb. Cathode is marked by a band on the glass body; no anode marking is present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Band End) | Regulated Output Reference Node | Connected to unregulated input rail; Zener current flows into this terminal during regulation |
| Anode (Non-Band End) | Ground or Low-Side Reference | Tied to system ground or common return; establishes reference potential for voltage clamp |
Key Features
| Feature | Design Value |
|---|---|
| Voidless Hermetic Glass Construction | Eliminates internal voids to prevent moisture ingress and ensure long-term reliability in sealed enclosures |
| Category I Metallurgical Bond | Guarantees mechanical integrity of internal die attach under thermal cycling and shock per MIL-PRF-19500/356 |
| Triple-Layer Passivation | Provides robust surface protection against contamination and ion migration in high-humidity environments |
| Radiation Hardness | Inherently resistant to total ionizing dose (TID) per MicroNote 050 - suitable for space and nuclear applications |
| ESD Immunity | Qualified to MIL-STD-750 Method 1020 - withstands >4 kV HBM without parameter shift |
Applications
| Aerospace Power Conditioning | Military Avionics Reference |
|---|---|
Use Scenario: Regulating auxiliary 8.2 V supply rail in satellite power distribution units exposed to thermal vacuum and radiation. IC Role / Device Role / Timing Role: Shunt voltage regulator providing stable reference for DC-DC converter feedback loops. Use Value: Hermetic seal and radiation hardness ensure uninterrupted operation over 15+ year mission life without parameter drift. | Use Scenario: Precision voltage reference in radar receiver front-end bias networks operating across −55 °C to +125 °C. IC Role / Device Role / Timing Role: Zener-based reference source for analog signal chain calibration. Use Value: ±5% tolerance and +0.06 %/°C tempco enable <±1.2% total error over full military temperature range. |
| Downhole Oilfield Instrumentation | Nuclear Reactor Monitoring Systems |
Use Scenario: Overvoltage clamp protecting sensor interface ICs in borehole logging tools subjected to 175 °C ambient. IC Role / Device Role / Timing Role: Transient voltage suppressor and precision clamp diode. Use Value: 175 °C max junction temperature and 7 °C/W thermal resistance allow direct mounting on high-temp PCBs without heatsinking. | Use Scenario: Critical voltage reference in reactor control rod position monitoring electronics requiring fail-safe behavior. IC Role / Device Role / Timing Role: Redundant shunt regulator in safety-critical analog monitoring path. Use Value: JAN-class qualification and Category I metallurgical bond guarantee zero latent defects and deterministic failure mode under neutron flux. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4956CUS/TR | Higher screening level (JANTXV vs JANTX); tighter lot acceptance testing per MIL-PRF-19500/356 | Required for Class V applications demanding extended burn-in and radiation lot acceptance tests | Select when full JANTXV screening is mandated by system-level qualification requirements |
| 1N4956US (non-JAN) | No military qualification; commercial-grade screening; same electrical specs and package | Suitable only for non-military industrial systems with relaxed reliability and traceability requirements | Select for cost-sensitive prototyping or non-safety-critical commercial deployments |
Compared with JANTX1N4956CUS/TR, the JANTXV variant adds enhanced screening for extreme environments while the 1N4956US offers identical performance at lower cost but without MIL-spec traceability or radiation assurance.
Availability
JANTX1N4956CUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, military avionics reference design, and downhole instrumentation requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4956CUS/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 defense, aerospace, and industrial markets.
The JANTX1N4956CUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener series, engineered specifically for mission-critical voltage regulation where hermeticity, radiation tolerance, and wide-temperature operation are mandatory.
FAQ
What is the Zener voltage tolerance for JANTX1N4956CUS/TR?
The "C" suffix in JANTX1N4956CUS/TR denotes ±5% Zener voltage tolerance at 25 °C, corresponding to a nominal 8.2 V rating with a guaranteed range of 7.79 V to 8.61 V under specified test conditions (IZT = 150 mA).
Does JANTX1N4956CUS/TR require heatsinking in 5 W operation?
JANTX1N4956CUS/TR is rated for 5 W dissipation only at end-cap temperature (TEC) ≤ 140 °C, with linear derating to zero at 175 °C. Heatsinking is required to maintain TEC within spec under sustained load; its 7 °C/W junction-to-end-cap thermal resistance dictates PCB copper area and thermal vias per Microsemi's D-5B layout guidelines.
Is JANTX1N4956CUS/TR compatible with lead-free reflow processes?
No - JANTX1N4956CUS/TR features Sn/Pb terminations and is not qualified for lead-free reflow. Its maximum peak reflow temperature is limited to 235 °C per MIL-STD-202 Method 210, and Pb-free solder profiles exceed both thermal and metallurgical limits of the Sn/Pb finish and glass-to-metal seal.
What does the "US" suffix indicate in JANTX1N4956CUS/TR?
The "US" suffix identifies the surface-mount D-5B ("E") package. Removing "US" yields the axial-leaded 1N4956 variant for through-hole mounting. The "TR" denotes tape-and-reel packaging per EIA-481-B standard, enabling automated placement.
How is radiation hardness verified for JANTX1N4956CUS/TR?
Radiation hardness for JANTX1N4956CUS/TR is inherent to its voidless hermetic glass construction and Category I metallurgical bond, documented in Microsemi MicroNote 050. It is not individually tested per lot but qualified via process-level radiation tolerance validation across the 1N4954US–1N4996US family.
JANTX1N4956CUS/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):
- 8.2 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 1.5 Ohms
- Current - Reverse Leakage @ Vr:
- 50 µA @ 6.2 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
JANTX1N4956CUS/TR FAQ
1.How can I place an order for JANTX1N4956CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4956CUS/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 JANTX1N4956CUS/TR reliable?
The price and inventory of JANTX1N4956CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4956CUS/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4956CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4956CUS/TR transactions.
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4.How is shipping managed for JANTX1N4956CUS/TR?
JANTX1N4956CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4956CUS/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 JANTX1N4956CUS/TR?
For technical support, including JANTX1N4956CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4956CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4956CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4956CUS/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 JANTX1N4956CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4956CUS/TR?
All JANTX1N4956CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4956CUS/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 JANTX1N4956CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4956CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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