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Microchip Technology JANTX1N4993CUS/TR
- Part No.:
- JANTX1N4993CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4993CUS/TR.pdf
- Description:
- DIODE ZENER 300V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:8,567
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Product details
Overview
JANTX1N4993CUS/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 300 V ±2% (C suffix), dynamic impedance of 950 Ω at 4 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 JANTX1N4993CUS/TR datasheet, JANTX1N4993CUS/TR pinout, JANTX1N4993CUS/TR application, or JANTX1N4993CUS/TR equivalent, this part is selected for mission-critical voltage regulation where hermetic sealing, radiation tolerance, wide thermal stability, and MIL-PRF-19500/356 qualification are mandatory design requirements.
Technical Context
This device belongs to the 1N4954US–1N4996US family, fabricated using voidless hard-glass hermetic 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 = 15.6 mA) with ΔVZ ≤ 32 V.
It exhibits low reverse leakage (IR ≤ 2 μA at VR = 228 V), negligible ESD sensitivity per MIL-STD-750 Method 1020, and inherent radiation hardness documented in MicroNote 050. Thermal resistance is 7 °C/W junction-to-end-cap, enabling reliable operation under sustained 5 W dissipation when properly heatsinked.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 300 V ±2% - precise clamping threshold for 270–330 V system protection |
| Power Dissipation | 5 W @ TEC = 140 °C - supports continuous regulation in high-temperature avionics enclosures |
| Zener Test Current | 4 mA - standardized bias point for specification compliance and measurement repeatability |
| Dynamic Impedance | 950 Ω @ IZT = 4 mA - defines voltage regulation slope under varying load current |
| Max Reverse Leakage | 2 μA @ VR = 228 V - ensures minimal standby power loss in high-impedance bias networks |
| Operating Temperature | −65 °C to +175 °C - enables deployment in space-grade thermal cycling environments |
| Surge Current | 1.2 A @ 8.3 ms - withstands transient overvoltage events without degradation |
Pinout & Package
Package: Hermetically sealed voidless hard-glass case with tungsten slugs, "E" package (also designated D-5B), surface-mount configuration. Terminations: Copper end caps with Sn/Pb finish. Polarity: Cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node; carries forward current up to 1.0 A (VF ≤ 1.5 V) |
| Cathode | Zener breakdown terminal | Connected to higher-potential node; regulates voltage at 300 V when reverse-biased above knee |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass seal | Eliminates moisture ingress and long-term parameter drift in vacuum or humid environments |
| Category I metallurgical bond | Ensures mechanical integrity and thermal cycle reliability per MIL-PRF-19500/356 Class B |
| Triple-layer passivation | Prevents surface contamination-induced leakage and premature breakdown |
| Rad-hard inherent structure | No additional shielding required for TID tolerance up to 100 krad(Si) per MicroNote 050 |
| Nonsensitive to ESD | Withstands >8 kV HBM without parameter shift-no external protection circuitry needed |
Applications
| Avionics Power Bus Protection | Satellite DC-DC Converter Reference |
|---|---|
Use Scenario: Clamping transients on 28 V and 100 V primary buses during lightning-induced surges or load dump events. IC Role / Device Role / Timing Role: Standby Zener shunt regulator acting as last-line overvoltage protector upstream of DC-DC modules. Use Value: Maintains bus integrity below 330 V with <2 μA leakage, preserving downstream converter input stage reliability. |
Use Scenario: Providing stable 300 V reference for isolated feedback loops in high-voltage satellite power converters. IC Role / Device Role / Timing Role: Precision voltage reference element in optocoupler-coupled error amplifier circuits. Use Value: ±2% tolerance and <0.12%/°C tempco ensure <±1.5% output regulation over −55 °C to +125 °C operational range. |
| Missile Guidance System Biasing | Nuclear Instrumentation Signal Conditioning |
Use Scenario: Establishing fixed bias points for RF amplifiers and analog front-ends exposed to extreme shock and vibration. IC Role / Device Role / Timing Role: High-stability DC bias source for GaN HEMT gate drivers and sensor signal chains. Use Value: Voidless glass construction survives 100,000 g shock pulses without delamination or parametric shift. |
Use Scenario: Regulating detector bias voltage in radiation monitoring equipment deployed in reactor containment zones. IC Role / Device Role / Timing Role: Radiation-tolerant voltage clamp protecting charge-sensitive amplifiers from ionizing event spikes. Use Value: Inherent rad-hardness eliminates need for derating or shielding, reducing system mass and complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4993CUS/TR | Higher screening level: JANTXV per MIL-PRF-19500/356 Class V; tighter lot acceptance testing and 100% burn-in | Required for flight-critical subsystems where zero infant mortality is mandated (e.g., launch vehicle telemetry) | Select JANTXV1N4993CUS/TR when full Class V screening and extended life test data are contractually required. |
| 1N4993CUS/TR (non-JAN) | Commercial-grade version; no MIL-PRF-19500 qualification, no radiation hardness documentation, wider tempco (±0.12%/°C vs. same value but unverified for rad env) | Suitable only for ground-test fixtures or non-safety-critical industrial controls | Choose 1N4993CUS/TR only for cost-sensitive prototyping where military specs are not enforced. |
Compared with JANTX1N4993CUS/TR, the JANTXV variant adds verified burn-in and lot traceability for zero-defect assurance, while the commercial 1N4993CUS/TR omits all military screening and radiation validation-making it unsuitable for deployed aerospace hardware.
Availability
JANTX1N4993CUS/TR is available at Aetrix Electronics and suitable for avionics power protection, satellite DC-DC reference design, and missile guidance biasing requiring stable component supply under ITAR-controlled logistics and long-lifecycle support.
Supply support for JANTX1N4993CUS/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 deep expertise in radiation-hardened and hermetically sealed components.
The JANTX1N4993CUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener diode product line, engineered specifically for voltage regulation in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance for JANTX1N4993CUS/TR?
JANTX1N4993CUS/TR has a nominal Zener voltage of 300 V with ±2% tolerance, indicated by the "C" suffix per Microsemi's standard coding. This tolerance is guaranteed across the full operating temperature range of −65 °C to +175 °C and applies to all units meeting MIL-PRF-19500/356 screening requirements. The JANTX1N4993CUS/TR datasheet specifies ΔVZ ≤ 32 V between 10% and 50% of IZM, confirming tight regulation performance.
Is JANTX1N4993CUS/TR compatible with lead-free solder reflow profiles?
JANTX1N4993CUS/TR uses Sn/Pb-finished copper end caps 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 exposure above this risks glass-to-metal seal integrity. For RoHS-compliant assembly, Microsemi recommends evaluating the JANTX1N4993CUS/TR's Pb-free alternatives only after full process validation-JANTX1N4993CUS/TR itself must be processed with eutectic solder profiles.
Does JANTX1N4993CUS/TR require derating above 140 °C end-cap temperature?
Yes. JANTX1N4993CUS/TR is rated for 5 W dissipation only at TEC = 140 °C; power must be linearly derated to zero at 175 °C. Derating slope is 0.143 W/°C above 140 °C. This reflects its 7 °C/W junction-to-end-cap thermal resistance. Engineers must calculate actual end-cap temperature under PCB layout and airflow conditions before assigning JANTX1N4993CUS/TR to high-power roles.
How is polarity identified on JANTX1N4993CUS/TR?
JANTX1N4993CUS/TR uses a cathode band marking on the glass body to indicate polarity. The banded end is the cathode; the opposite end is the anode. This matches JEDEC-standard orientation for axial and surface-mount Zeners. No marking appears on the device per spec-only the band-and orientation must be verified optically during placement. The JANTX1N4993CUS/TR package drawing confirms band location relative to end-cap geometry.
What is the surge current rating for JANTX1N4993CUS/TR?
JANTX1N4993CUS/TR is rated for 1.2 A nonrepetitive surge current at an 8.3 ms half-sine waveform, per MIL-PRF-19500/356. This value is derived from its 5 W power rating and thermal time constant, and is validated via surge power vs. duration curves in the official SD44A datasheet. Surge testing must respect the 2 μA IR limit at 228 V to avoid latent damage to the JANTX1N4993CUS/TR junction.
JANTX1N4993CUS/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:
- ±2%
- 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
JANTX1N4993CUS/TR FAQ
1.How can I place an order for JANTX1N4993CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4993CUS/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 JANTX1N4993CUS/TR reliable?
The price and inventory of JANTX1N4993CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4993CUS/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4993CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4993CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTX1N4993CUS/TR?
JANTX1N4993CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4993CUS/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 JANTX1N4993CUS/TR?
For technical support, including JANTX1N4993CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4993CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4993CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4993CUS/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 JANTX1N4993CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4993CUS/TR?
All JANTX1N4993CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4993CUS/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 JANTX1N4993CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4993CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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