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Microchip Technology JANTX1N4973DUS/TR
- Part No.:
- JANTX1N4973DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4973DUS/TR.pdf
- Description:
- DIODE ZENER 43V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:3,042
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Product details
Overview
JANTX1N4973DUS/TR from Microsemi is a hermetically sealed, voidless-glass surface-mount 5 W Zener diode with nominal Zener voltage of 43 V, ±5% tolerance (no suffix), maximum dynamic impedance of 20 Ω at 30 mA test current, and operating junction temperature range from –65 °C to +175 °C. It serves as a precision voltage reference or overvoltage clamp in high-reliability military power conditioning circuits.
For engineers reviewing the JANTX1N4973DUS/TR datasheet, JANTX1N4973DUS/TR pinout, JANTX1N4973DUS/TR application, or JANTX1N4973DUS/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 1N4954US–1N4996US family and uses Category III internal metallurgical bonds for enhanced reliability. Its voidless glass construction eliminates moisture ingress paths and supports operation up to 175 °C junction temperature without parameter drift.
The JANTX1N4973DUS/TR exhibits a temperature coefficient of +0.095 %/°C at IZT, reverse leakage ≤2 μA at 32.7 V, and surge current rating of 3.5 A (8.3 ms square wave). It is not a bidirectional device and requires cathode-band orientation during PCB placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V nominal at 30 mA - defines stable regulation point for biasing or clamping in high-temp analog stages |
| Power Dissipation | 5 W @ TEC = 125 °C - requires thermal pad design with ≥140 °C end-cap temperature margin |
| Dynamic Impedance (ZZ) | 20 Ω max at IZT = 30 mA - ensures <1.3 V output variation across 3–15 mA load current swing |
| Reverse Leakage (IR) | ≤2 μA at 32.7 V - enables low-power standby regulation without significant quiescent loss |
| Temp Coefficient (αVZ) | +0.095 %/°C - predictable positive drift allows compensation in multi-stage references |
| Surge Current (IZSM) | 3.5 A (8.3 ms) - withstands transient overvoltage events in avionics power rails |
| Forward Voltage (VF) | 1.5 V max at 1.0 A - supports use as polarity-sensitive protection diode in series with regulator |
Pinout & Package
Package: Hermetically sealed voidless hard glass case with tungsten slugs; "E" package (also designated D-5B); cathode indicated by band; copper end caps with Sn/Pb finish; weight 539 mg; tape-and-reel per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to ground or lower-potential node when used as shunt regulator |
| Cathode | Current exit terminal in forward bias; Zener breakdown terminal | Connected to regulated voltage node; marked by visible band on glass body |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture-induced parameter shift and corrosion failure modes in humid or sealed enclosures |
| Category III metallurgical bond | Validated interfacial integrity for >10,000 thermal cycles between –65 °C and +175 °C |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands >15 kV HBM without parameter degradation-no external ESD protection required |
| Inherent radiation hardness | Qualified per MicroNote 050 for total ionizing dose >100 krad(Si) - suitable for space-grade LDO references |
| Triple-layer passivation | Prevents surface conduction paths and leakage increase under high humidity or contamination |
Applications
| Aerospace Power Conditioning | Downhole Instrumentation Reference |
|---|---|
Use Scenario: Regulating auxiliary supply rails in satellite DC-DC converters exposed to thermal vacuum and radiation. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 43 V bias for op-amp comparators and ADC drivers. Use Value: Maintains ±0.5% regulation accuracy over –65 °C to +125 °C ambient with no derating below 5 W. |
Use Scenario: Precision voltage clamp in high-temperature logging tools deployed at 200 °C wellbore environments. IC Role / Device Role / Timing Role: Overvoltage protector for sensor front-end amplifiers subjected to lightning-induced transients. Use Value: Survives 10,000-hour life test at 175 °C junction temperature with <5% VZ drift. |
| Military Radar Bias Supply | Nuclear Reactor Monitoring |
Use Scenario: Stabilizing gate drive voltages for GaN RF power amplifiers in airborne radar transceivers. IC Role / Device Role / Timing Role: Zener clamp limiting gate-source voltage excursion during fast switching transitions. Use Value: 3.5 A surge rating absorbs 100 ns EFT bursts without latch-up or parametric shift. |
Use Scenario: Reference element in neutron flux measurement circuits requiring decades-long calibration stability. IC Role / Device Role / Timing Role: Primary voltage standard in radiation-hardened analog signal chains. Use Value: Inherent TID hardness eliminates need for shielding or redundancy in containment zone electronics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4973DUS/TR | Higher screening level (JANTXV vs JANTX); tighter test limits on leakage and tempco; qualified to MIL-PRF-19500/356 Class V | Required for flight-critical subsystems where burn-in and lot acceptance testing exceed JANTX requirements | Select JANTXV1N4973DUS/TR when mission assurance level mandates Class V screening per DoD contracts |
| 1N4973US (non-military) | No MIL-qualified screening; commercial temperature range only (–65 °C to +150 °C); no radiation or ESD validation | Suitable for industrial test equipment or non-safety-critical lab instruments | Choose 1N4973US only for cost-sensitive terrestrial applications with no environmental or reliability certification needs |
Compared with JANTX1N4973DUS/TR, the JANTXV variant adds process controls for extended life and tighter parametric bounds, while the commercial 1N4973US omits military screening entirely-making JANTX1N4973DUS/TR the optimal balance of qualification rigor and procurement availability for defense-tier programs.
Availability
JANTX1N4973DUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, downhole instrumentation reference, and military radar bias supply requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4973DUS/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 high-temperature performance.
The JANTX1N4973DUS/TR belongs to Microsemi's 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 JANTX1N4973DUS/TR?
The JANTX1N4973DUS/TR has a nominal Zener voltage of 43 V with ±5% tolerance, consistent with the base-series designation per MIL-PRF-19500/356. No suffix letter indicates standard tolerance; tighter tolerances (e.g., ±2% or ±1%) require C or D suffixes not present in this part number. This tolerance applies across the full operating temperature range.
Does JANTX1N4973DUS/TR require heatsinking in 5 W operation?
Yes - JANTX1N4973DUS/TR delivers 5 W only when end-cap temperature (TEC) is maintained at ≤125 °C. At higher ambient temperatures, linear derating applies to zero at 175 °C. A minimum 0.5 in² copper thermal pad with 2 oz copper and 4 thermal vias is recommended to sustain full power in enclosed chassis.
Is JANTX1N4973DUS/TR compatible with lead-free reflow processes?
No - JANTX1N4973DUS/TR features Sn/Pb terminations and is not rated for lead-free reflow profiles. Its maximum peak reflow temperature is 235 °C for 10 seconds, below typical SAC305 (245 °C) requirements. Use only with Sn63/Pb37 solder paste and profiled ramp-soak-reflow cycles.
What does the "DUS/TR" suffix indicate in JANTX1N4973DUS/TR?
The "DUS/TR" suffix denotes: D = ±5% Zener voltage tolerance; US = surface-mount "E" package (D-5B); TR = tape-and-reel packaging per EIA-481-B. The "JANTX" prefix confirms compliance with MIL-PRF-19500/356 Level X screening, including electrical testing, visual inspection, and lot traceability.
Can JANTX1N4973DUS/TR be used in bidirectional transient suppression?
No - JANTX1N4973DUS/TR is a unidirectional Zener diode optimized for forward conduction and reverse breakdown regulation. It lacks symmetrical avalanche characteristics and is not rated for bidirectional TVS operation. For bidirectional protection, discrete back-to-back Zeners or purpose-built TVS arrays must be used instead of JANTX1N4973DUS/TR.
JANTX1N4973DUS/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):
- 43 V
- Tolerance:
- ±1%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 32.7 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
JANTX1N4973DUS/TR FAQ
1.How can I place an order for JANTX1N4973DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4973DUS/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 JANTX1N4973DUS/TR reliable?
The price and inventory of JANTX1N4973DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4973DUS/TR is usually 5 days.
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JANTX1N4973DUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4973DUS/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 JANTX1N4973DUS/TR?
For technical support, including JANTX1N4973DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4973DUS/TR requirements.
6.How does Aetrix verify that JANTX1N4973DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4973DUS/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 JANTX1N4973DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4973DUS/TR?
All JANTX1N4973DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4973DUS/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 JANTX1N4973DUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4973DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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