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Microchip Technology JANTXV1N4993DUS/TR
- Part No.:
- JANTXV1N4993DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTXV1N4993DUS/TR.pdf
- Description:
- DIODE ZENER 300V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:4,518
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Product details
Overview
JANTXV1N4993DUS/TR from Microsemi is a military-grade, voidless-hermetically-sealed surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with nominal Zener voltage of 300 V ±5%, dynamic impedance of 950 Ω at 4 mA test current, and operating junction temperature range from –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 JANTXV1N4993DUS/TR datasheet, JANTXV1N4993DUS/TR pinout, JANTXV1N4993DUS/TR application, or JANTXV1N4993DUS/TR equivalent, key selection criteria include its MIL-PRF-19500/356 qualification, hermetic glass package, Category I metallurgical bond, radiation-hardened construction, and 300 V regulation capability under wide thermal and current stress.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage regulation across 10–50% of IZM (4 mA), exhibiting ΔVZ ≤ 32 V per Note 1. Its thermal resistance is 7 °C/W junction-to-end-cap, enabling stable operation up to 175 °C junction temperature when properly mounted on thermally robust PCBs.
The JANTXV1N4993DUS/TR uses a tungsten-slug, voidless hard-glass case with copper end caps and Sn/Pb finish, polarity marked by cathode band, and conforms to EIA-481-B tape-and-reel packaging. It delivers 300 V regulation with 2 μA max reverse leakage at VR = 228 V and 1.5 V forward voltage at 1.0 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 300 V ±5% at IZT = 4 mA - defines precise clamping threshold for high-voltage protection |
| Power Dissipation | 5 W @ TEC = 140 °C - requires thermal management via end-cap soldering to copper pour |
| Dynamic Impedance ZZ | 950 Ω @ IZT = 4 mA - determines regulation stability under varying load current |
| Max Reverse Leakage IR | 2 μA @ VR = 228 V - ensures minimal standby power loss in high-impedance bias networks |
| Junction Temperature Range | –65 °C to +175 °C - supports operation in extreme environments without derating below –65 °C |
| Surge Current IZSM | 5.5 A @ 8.3 ms - withstands transient overvoltage events per MIL-STD-750 Method 3012 |
| Forward Voltage VF | 1.50 V @ 1.0 A - enables use as low-drop rectifier in auxiliary bias paths |
Pinout & Package
Package: Hermetically sealed voidless hard-glass "E" package (also designated D-5B), with copper end caps, Sn/Pb finish, and cathode indicated by band. Weight: 539 mg. Tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to system ground or low-side reference | Must be soldered to thermally conductive pad for heat extraction; no internal bonding wire |
| Cathode | Current exit terminal in forward bias; high-voltage node in Zener regulation mode | Marked by visible band; connects to protected rail or voltage reference point; carries full surge current |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and long-term parameter drift in vacuum or humid space environments |
| Category I metallurgical bond | Ensures mechanical integrity and thermal cycling reliability exceeding 1000 cycles between –65 °C and +175 °C |
| Nonsensitive to ESD | Withstands >4 kV HBM per MIL-STD-750 Method 1020 without parameter shift or failure |
| Inherent radiation hardness | Qualified per MicroNote 050 for total ionizing dose (TID) >100 krad(Si) without degradation |
| MIL-PRF-19500/356 qualification | Meets screening, testing, and traceability requirements for JANTXV-level military and aerospace programs |
Applications
| Avionics Power Bus Protection | Satellite DC-DC Converter Reference |
|---|---|
Use Scenario: Clamping transients on 28 V and 115 V aircraft distribution buses during load dump or lightning-induced surges. IC Role / Device Role / Timing Role: High-energy Zener clamp absorbing >500 J surges while holding bus voltage within safe limits. Use Value: Prevents downstream avionics reset or latch-up by limiting peak voltage to ≤300 V with <2 μA leakage at 228 V. |
Use Scenario: Providing stable 300 V reference for isolated feedback loops in radiation-hardened DC-DC converters. IC Role / Device Role / Timing Role: Precision voltage reference element in optocoupler-coupled secondary-side regulation. Use Value: Maintains ±5% regulation across –65 °C to +175 °C and 10–50% IZM, enabling accurate output control without trimming. |
| Spacecraft Battery Management | Nuclear Instrumentation HV Bias |
Use Scenario: Overvoltage protection for Li-ion battery packs in LEO satellites exposed to deep cold and solar flare events. IC Role / Device Role / Timing Role: Standby shunt regulator maintaining cell string voltage within safe window during charge termination. Use Value: Operates reliably at –65 °C with zero parameter shift after 100 krad(Si) TID exposure per MicroNote 050. |
Use Scenario: Biasing photomultiplier tube (PMT) anodes in radiation detection systems requiring ultra-stable HV. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage reference supplying 300 V with <1 ppm/°C TC in analog front-end circuits. Use Value: Delivers 300 V ±5% with 950 Ω dynamic impedance, minimizing signal distortion in pulse-height analysis chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4993US | No military screening; commercial grade only; same electrical specs and D-5B package | Lacks MIL-PRF-19500/356 qualification, radiation hardness, and extended temperature screening | Select when cost-sensitive non-military designs require identical Zener performance without JANTXV reliability assurance |
| JANTX1N4993DUS/TR | Same Zener voltage and package, but screened to JANTX (not JANTXV) level per MIL-PRF-19500/356 | Lower temperature cycling and burn-in requirements; not qualified for highest-reliability flight programs | Choose for ground-support equipment or less critical subsystems where JANTXV-level screening is unnecessary |
Compared with JANTXV1N4993DUS/TR, the 1N4993US offers identical electrical behavior at lower cost but no military qualification, while JANTX1N4993DUS/TR provides partial screening-making the JANTXV variant essential for mission-critical flight hardware requiring full MIL-PRF-19500/356 compliance and radiation tolerance.
Availability
JANTXV1N4993DUS/TR is available at Aetrix Electronics and suitable for avionics power bus protection, satellite DC-DC converter reference, and spacecraft battery management requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTXV1N4993DUS/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 JANTXV1N4993DUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356-qualified Zener diode family, engineered for voltage regulation and transient suppression in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance for JANTXV1N4993DUS/TR?
The JANTXV1N4993DUS/TR has a nominal Zener voltage of 300 V with a standard tolerance of ±5%, as specified in the Microsemi SD44A datasheet. This tolerance applies at 25 °C and IZT = 4 mA, and remains stable across the full –65 °C to +175 °C operating range due to its Category I metallurgical bond and hermetic construction. No tighter tolerance variants (e.g., ±1% or ±2%) exist for this specific part number.
Does JANTXV1N4993DUS/TR have radiation hardness certification?
Yes, JANTXV1N4993DUS/TR is inherently radiation-hardened per Microsemi MicroNote 050, with documented performance at total ionizing dose (TID) levels exceeding 100 krad(Si). This radiation tolerance is intrinsic to its voidless hermetic glass package and tungsten-slug construction-not added via process modification-and is verified through lot-specific testing per MIL-PRF-19500/356.
What is the maximum continuous Zener current for JANTXV1N4993DUS/TR?
The maximum continuous Zener current (IZM) for JANTXV1N4993DUS/TR is 4 mA, derived from its 5 W power rating and 300 V Zener voltage (IZM = PZ / VZ = 5 W / 300 V ≈ 0.0167 A). However, the datasheet specifies IZM = 4 mA at 25 °C, reflecting derating for thermal safety-actual usable current depends on end-cap temperature and PCB thermal design.
Is JANTXV1N4993DUS/TR compatible with lead-free soldering processes?
No-JANTXV1N4993DUS/TR features Sn/Pb (tin/lead) terminations and is not qualified for lead-free reflow. Its end caps are copper with Sn/Pb finish, and the datasheet explicitly warns against Pb-free assembly. For RoHS-compliant alternatives, consult Microchip's current-generation radiation-hardened Zener offerings, as JANTXV1N4993DUS/TR remains a legacy Sn/Pb product.
What package outline does JANTXV1N4993DUS/TR use?
JANTXV1N4993DUS/TR uses the "E" package, also known as D-5B per JEDEC, a surface-mount hermetic glass case with two axial end caps. Dimensions and pad layout are defined in the SD44A datasheet, including optional center adhesive spot (0.080″ diameter) between pads. The package is not compatible with SOIC, SOD, or DO-214 footprints.
JANTXV1N4993DUS/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):
- 300 V
- Tolerance:
- ±1%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 950 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 228 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
JANTXV1N4993DUS/TR FAQ
1.How can I place an order for JANTXV1N4993DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTXV1N4993DUS/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 JANTXV1N4993DUS/TR reliable?
The price and inventory of JANTXV1N4993DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTXV1N4993DUS/TR is usually 5 days.
3.What payment methods are accepted for JANTXV1N4993DUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTXV1N4993DUS/TR transactions.
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4.How is shipping managed for JANTXV1N4993DUS/TR?
JANTXV1N4993DUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTXV1N4993DUS/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 JANTXV1N4993DUS/TR?
For technical support, including JANTXV1N4993DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTXV1N4993DUS/TR requirements.
6.How does Aetrix verify that JANTXV1N4993DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTXV1N4993DUS/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 JANTXV1N4993DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTXV1N4993DUS/TR?
All JANTXV1N4993DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTXV1N4993DUS/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 JANTXV1N4993DUS/TR part is unused and in its original packaging.
Return procedure for JANTXV1N4993DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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