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Microchip Technology JANTXV1N4956CUS/TR
- Part No.:
- JANTXV1N4956CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTXV1N4956CUS/TR.pdf
- Description:
- DIODE ZENER 8.2V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:9,363
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Product details
Overview
JANTXV1N4956CUS/TR from Microsemi is a military-qualified, voidless hermetically sealed surface-mount Zener diode rated for 5 W power dissipation at 140°C end-cap temperature, with nominal Zener voltage of 8.2 V ±5%, dynamic impedance of 1.5 Ω at 150 mA test current, and operating junction temperature range from –65°C to +175°C. It serves as a precision voltage reference and regulation element in high-reliability power supply rails and voltage-clamping circuits.
For engineers reviewing the JANTXV1N4956CUS/TR datasheet, JANTXV1N4956CUS/TR pinout, JANTXV1N4956CUS/TR application, or JANTXV1N4956CUS/TR equivalent, this part is selected for aerospace, defense, and downhole instrumentation where radiation hardness, ESD immunity (MIL-STD-750 Method 1020), and long-term parametric stability under thermal cycling are mandatory.
Technical Context
This device belongs to the MIL-PRF-19500/356 qualified 1N4954US–1N4996US series, featuring triple-layer passivation and Category I internal metallurgical bonds. Its Zener breakdown mechanism delivers stable regulation across 10%–50% of maximum Zener current (IZM = 580 mA), with voltage change ΔVZ ≤ 0.7 V over that range.
The "E" package (D-5B) uses tungsten slugs and copper end caps with Sn/Pb finish, enabling direct solder attachment without adhesive. Thermal resistance is 7°C/W junction-to-end-cap, supporting 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 ±5% at IZT = 150 mA - defines regulated output voltage under nominal bias |
| Power Dissipation | 5 W @ TEC = 140°C - sets maximum continuous thermal load on PCB pad layout |
| Dynamic Impedance (ZZ) | 1.5 Ω @ IZT = 150 mA - determines output voltage variation under load transients |
| Max Reverse Leakage (IR) | 50 μA @ VR = 6.2 V - ensures low standby power loss in high-impedance bias networks |
| Surge Current (IZSM) | 24 A @ 8.3 ms square wave - supports transient overvoltage clamping in MIL-STD-1275/461 environments |
| Temp Coefficient (αVZ) | +0.06 %/°C @ IZT - enables predictable drift compensation in wide-temperature-range designs |
| Forward Voltage (VF) | 1.5 V @ 1.0 A - defines conduction loss when used in reverse-series or bidirectional clamp configurations |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (JEDEC D-5B), with tungsten slugs and 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 | Low-side terminal in Zener regulation | Connected to ground or lower-potential node; carries full Zener current during regulation |
| Cathode | High-side terminal with voltage reference | Banded end; establishes regulated output voltage relative to anode; requires stable bias current path |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal delamination risk over 20+ year field life in vacuum or corrosive atmospheres |
| Category I metallurgical bond | Ensures mechanical integrity and thermal cycle survivability exceeding 1000 cycles between –65°C and +175°C |
| Nonsensitive to ESD | Withstands >4 kV HBM without parameter shift-no external protection required in handling or assembly |
| Inherent radiation hardness | Qualified to 100 krad(Si) TID per MicroNote 050-enables use in LEO satellite power conditioning without shielding |
| Triple-layer passivation | Prevents surface leakage and parameter drift under high humidity or ionizing radiation exposure |
Applications
| Aerospace Power Bus Regulation | Downhole Instrumentation Reference |
|---|---|
Use Scenario: Regulating auxiliary 8.2 V rail in satellite power distribution unit exposed to thermal cycling and proton irradiation. IC Role / Device Role / Timing Role: Zener diode providing primary voltage reference for DC-DC converter feedback loop. Use Value: Stable 8.2 V output with <0.06 %/°C drift ensures converter accuracy remains within ±1.5% over –65°C to +125°C operational range. |
Use Scenario: Precision voltage clamp protecting analog front-end inputs in oil-well logging tools operating at 175°C ambient. IC Role / Device Role / Timing Role: Overvoltage protection element shunting transients above 8.2 V to ground. Use Value: 24 A surge rating and 7°C/W thermal resistance enable repeated 8.3 ms transients without thermal runaway at 175°C. |
| Military Vehicle Power Conditioning | Nuclear Facility Sensor Interface |
Use Scenario: Clamping induced spikes on 28 V vehicle bus per MIL-STD-1275B during load dump events. IC Role / Device Role / Timing Role: Transient voltage suppressor placed across critical sensor supply lines. Use Value: 5 W steady-state dissipation and 24 A surge capability absorb energy without degradation across 10,000+ load-dump cycles. |
Use Scenario: Providing radiation-hardened reference for gamma-ray detector biasing circuitry in reactor containment zones. IC Role / Device Role / Timing Role: Stable Zener reference maintaining calibration integrity under 100 krad(Si) total ionizing dose. Use Value: Inherent radiation hardness eliminates need for shielding or derating-reference voltage shift <0.3% after full dose exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4956UR-1 | Same electrical specs but axial-leaded DO-41 package; no surface-mount compatibility | Requires through-hole PCB layout and wave-solder process; unsuitable for high-density SMT assemblies | Select only when legacy board rework or manual prototyping demands axial lead form factor |
| CDLL1082US | Commercial-grade 8.2 V Zener (non-military); 3 W rating; 10°C/W thermal resistance; no radiation qualification | Limited to benign-environment industrial controls; fails MIL-PRF-19500/356 screening and radiation testing | Acceptable only for cost-sensitive non-critical applications where TID tolerance and extended temperature range are not required |
Compared with JANTXV1N4956CUS/TR, JANTXV1N4956UR-1 offers identical regulation performance but sacrifices SMT manufacturability, while CDLL1082US reduces cost and size at the expense of reliability, radiation hardness, and thermal robustness-making JANTXV1N4956CUS/TR the sole choice for mission-critical embedded systems.
Availability
JANTXV1N4956CUS/TR is available at Aetrix Electronics and suitable for aerospace power regulation, downhole instrumentation reference, and military vehicle power conditioning requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTXV1N4956CUS/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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets, with emphasis on radiation-hardened and extended-temperature components.
The JANTXV1N4956CUS/TR belongs to Microsemi's MIL-PRF-19500/356 qualified Zener diode family, engineered specifically for voltage regulation and transient suppression in safety-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance and test condition for JANTXV1N4956CUS/TR?
JANTXV1N4956CUS/TR has a nominal Zener voltage of 8.2 V with ±5% tolerance, measured at a test current (IZT) of 150 mA. This tolerance reflects the initial calibration at 25°C and is maintained across the full –65°C to +175°C operating temperature range per MIL-PRF-19500/356 screening requirements. The JANTXV1N4956CUS/TR datasheet specifies ΔVZ ≤ 0.7 V between 10% and 50% of IZM, confirming tight regulation stability under varying load conditions.
Does JANTXV1N4956CUS/TR require external heat sinking in standard PCB layouts?
No, JANTXV1N4956CUS/TR does not require external heat sinking when mounted on standard FR-4 PCBs with ≥1 in² of 2-oz copper pour connected to both end caps. Its 7°C/W junction-to-end-cap thermal resistance allows full 5 W dissipation at TEC = 140°C. Derating begins linearly above that temperature, reaching zero dissipation at 175°C junction temperature-consistent with its qualified operating range.
Is JANTXV1N4956CUS/TR compatible with lead-free reflow processes?
JANTXV1N4956CUS/TR features Sn/Pb terminations and is not qualified for Pb-free reflow. Its specified maximum end-cap temperature of 140°C and glass-body construction are optimized for Sn63/Pb37 solder profiles. Substituting lead-free paste or exceeding 220°C peak reflow risks cracking the voidless glass seal or degrading the Category I metallurgical bond-therefore JANTXV1N4956CUS/TR must be processed using eutectic solder and controlled thermal profiles.
How does the radiation hardness of JANTXV1N4956CUS/TR compare to commercial Zeners?
JANTXV1N4956CUS/TR is inherently radiation-hardened per Microsemi MicroNote 050, exhibiting <0.3% Zener voltage shift after 100 krad(Si) total ionizing dose-unlike commercial Zeners which typically degrade beyond specification after 10–20 krad(Si). This hardness arises from voidless glass encapsulation and triple-layer passivation, not process hardening, making JANTXV1N4956CUS/TR uniquely suitable for unshielded space and nuclear applications without derating.
Can JANTXV1N4956CUS/TR be used in bidirectional transient protection configurations?
Yes, JANTXV1N4956CUS/TR can be used in bidirectional clamping when paired with a second unit in series opposition, leveraging its 1.5 V forward voltage at 1.0 A. However, its primary design intent is unidirectional Zener regulation; for dedicated bidirectional TVS applications, Microsemi's dedicated TVS arrays (e.g., MMBZ52xx series) offer lower clamping voltage and faster response. The JANTXV1N4956CUS/TR remains valid for low-frequency, high-energy bidirectional clamping where parameter stability under radiation is essential.
JANTXV1N4956CUS/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
JANTXV1N4956CUS/TR FAQ
1.How can I place an order for JANTXV1N4956CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTXV1N4956CUS/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 JANTXV1N4956CUS/TR reliable?
The price and inventory of JANTXV1N4956CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTXV1N4956CUS/TR is usually 5 days.
3.What payment methods are accepted for JANTXV1N4956CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTXV1N4956CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTXV1N4956CUS/TR?
JANTXV1N4956CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTXV1N4956CUS/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 JANTXV1N4956CUS/TR?
For technical support, including JANTXV1N4956CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTXV1N4956CUS/TR requirements.
6.How does Aetrix verify that JANTXV1N4956CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTXV1N4956CUS/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 JANTXV1N4956CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTXV1N4956CUS/TR?
All JANTXV1N4956CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTXV1N4956CUS/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 JANTXV1N4956CUS/TR part is unused and in its original packaging.
Return procedure for JANTXV1N4956CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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