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Microchip Technology JANTX1N4989CUS/TR
- Part No.:
- JANTX1N4989CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4989CUS/TR.pdf
- Description:
- DIODE ZENER 200V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:9,906
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Product details
Overview
JANTX1N4989CUS/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 200 V ±1% (C suffix), dynamic impedance of 500 Ω at 5 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 JANTX1N4989CUS/TR datasheet, JANTX1N4989CUS/TR pinout, JANTX1N4989CUS/TR application, or JANTX1N4989CUS/TR equivalent, this part is selected for mission-critical voltage regulation where hermetic sealing, radiation tolerance, ESD immunity per MIL-STD-750 Method 1020, and stable regulation across extreme thermal cycling are mandatory design requirements.
Technical Context
This device belongs to the MIL-PRF-19500/356 qualified 1N4954US–1N4996US family and uses voidless hard-glass construction with internal Category I metallurgical bonds. Its Zener breakdown mechanism delivers tight voltage regulation (±1%) with low temperature coefficient (+0.110%/°C) and maintains stable dynamic impedance (500 Ω) across its specified 5 mA test current.
The JANTX1N4989CUS/TR operates with forward voltage ≤1.50 V at 1.0 A and exhibits maximum reverse leakage of 2 μA at 152 V - enabling reliable clamping in high-impedance bias networks. Its thermal resistance is 7 °C/W (junction-to-end-cap), supporting sustained 5 W dissipation under controlled PCB thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 200 V ±1% at 5 mA - enables precise 200 V reference generation with minimal calibration drift. |
| Power Dissipation | 5 W @ TEC = 140 °C - supports robust operation in conduction-cooled avionics enclosures. |
| Dynamic Impedance ZZ | 500 Ω @ IZT = 5 mA - ensures low output impedance for stable regulation under load transients. |
| Max Reverse Leakage IR | 2 μA @ 152 V - guarantees negligible current draw in high-impedance sensing or biasing paths. |
| Temp Coefficient αVZ | +0.110 %/°C @ IZT - provides predictable voltage shift over –65 °C to +175 °C operational range. |
| Forward Voltage VF | ≤1.50 V @ 1.0 A - allows use as low-loss series rectifier or crowbar element in fault protection. |
| Surge Current IZSM | 18 A @ 8.3 ms - withstands lightning-induced transients in MIL-STD-461-compliant systems. |
Pinout & Package
Package: Hermetically sealed voidless hard-glass case with tungsten slugs, "E" outline (also designated D-5B), cathode indicated by band, copper end caps with Sn/Pb finish, weight 539 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to ground or low-side reference node in shunt regulator topology. |
| Cathode | Current exit terminal in forward bias; Zener breakdown terminal | Connected to regulated rail; voltage clamped to 200 V when reverse-biased above breakdown threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal delamination risk in vacuum or high-humidity environments. |
| Category I metallurgical bond | Ensures mechanical integrity and thermal cycle reliability exceeding 1000 cycles between –65 °C and +175 °C. |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - no handling precautions required beyond standard Class 1A protocols. |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 - suitable for low-earth orbit satellite power subsystems. |
| Tape-and-reel packaging | EIA-481-B compliant - supports automated SMT placement without manual handling or contamination risk. |
Applications
| Aerospace Power Bus Protection | High-Voltage Reference Calibration |
|---|---|
Use Scenario: Clamp transient overvoltages on 200 V primary distribution bus in satellite power control unit. IC Role / Device Role / Timing Role: Shunt Zener regulator acting as passive overvoltage protector during load dump or switching surge events. Use Value: Maintains bus voltage within ±1% tolerance while absorbing up to 18 A surge current for 8.3 ms without degradation. |
Use Scenario: Provide traceable 200 V reference for ADC calibration in flight computer telemetry interface. IC Role / Device Role / Timing Role: Precision voltage reference source with <0.1% long-term stability and <2 μA leakage. Use Value: Enables 16-bit ADC full-scale accuracy without active trimming or temperature compensation circuitry. |
| Nuclear Instrumentation Bias Supply | Military Radar Pulse Modulator |
Use Scenario: Generate stable negative bias for photomultiplier tube anode chain in radiation detection system. IC Role / Device Role / Timing Role: High-voltage Zener reference in cascaded resistor-divider network. Use Value: Delivers <0.01%/1000 hr drift and survives 100 krad(Si) total ionizing dose without parameter shift. |
Use Scenario: Regulate gate drive voltage for thyratron-triggered pulse modulator in ground-based radar transmitter. IC Role / Device Role / Timing Role: Voltage clamp protecting gate driver IC from flyback spikes during pulse termination. Use Value: Withstands repetitive 15 kV/ns dV/dt transients and recovers regulation within 100 ns after surge event. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4989CUS/TR | Higher screening level (JANTXV vs JANTX); tighter lot acceptance testing per MIL-PRF-19500/356. | Required for spaceflight missions with zero-defect reliability mandates; not needed for terrestrial defense platforms. | Select JANTXV variant only when radiation environment exceeds 50 krad(Si) or mission duration >5 years. |
| 1N4989US | Commercial-grade version; no MIL-qualified screening, no radiation hardness validation, wider temp coefficient (±0.120%/°C). | Suitable for industrial test equipment but excluded from DoD procurement due to lack of JAN/JANTX qualification. | Use 1N4989US only in non-military, non-safety-critical applications with ambient temperature <+125 °C. |
Compared with JANTX1N4989CUS/TR, the JANTXV variant adds extended burn-in and radiation assurance at higher cost and longer lead time, while the 1N4989US omits all military screening and environmental validation - making the JANTX grade the optimal balance of assured reliability and procurement feasibility for defense electronics.
Availability
JANTX1N4989CUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, nuclear instrumentation biasing, and military radar pulse modulation requiring stable component supply under ITAR-controlled logistics and MIL-STD-883-compliant traceability.
Supply support for JANTX1N4989CUS/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 manufacturer specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The JANTX1N4989CUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 Zener diode product line, engineered specifically for voltage regulation and transient suppression in mission-critical systems operating across extreme temperature and radiation environments.
FAQ
What is the Zener voltage tolerance for JANTX1N4989CUS/TR?
The JANTX1N4989CUS/TR has a nominal Zener voltage of 200 V with ±1% tolerance, indicated by the "C" suffix in the part number. This tolerance is guaranteed over the full operating temperature range of –65 °C to +175 °C and verified per MIL-PRF-19500/356 test requirements. The JANTX1N4989CUS/TR achieves this precision via tight process control of the voidless-glass Zener junction and Category I metallurgical bonding.
Does JANTX1N4989CUS/TR require derating above 140 °C end-cap temperature?
Yes, JANTX1N4989CUS/TR must be linearly derated above 140 °C end-cap temperature, reaching zero power dissipation at 175 °C. Its thermal resistance is 7 °C/W junction-to-end-cap, so maintaining safe operation requires PCB-level thermal management - such as copper pour under the end caps and forced-air cooling - to limit TEC. Derating curves are defined in the SD44A datasheet revision E.
Is JANTX1N4989CUS/TR compatible with lead-free solder reflow profiles?
No, JANTX1N4989CUS/TR features Sn/Pb-finished copper end caps and is not qualified for Pb-free reflow. Its maximum peak reflow temperature is 235 °C for 10 seconds, consistent with Sn63/Pb37 eutectic profiles. Lead-free assembly would exceed glass-to-metal seal integrity limits and void the MIL-PRF-19500/356 qualification. Use only with SnPb solder paste and compatible thermal profiles.
What is the maximum continuous Zener current IZM for JANTX1N4989CUS/TR?
The maximum continuous Zener current IZM for JANTX1N4989CUS/TR is 9.0 mA at 25 °C ambient, decreasing with temperature per the derating curve. At 140 °C end-cap temperature, IZM drops to approximately 5.5 mA to maintain 5 W dissipation. This value is derived from the 200 V VZ rating and power limit, and is validated in the electrical characteristics table on page 2 of SD44A.pdf.
How is polarity identified on JANTX1N4989CUS/TR?
Polarity on JANTX1N4989CUS/TR is marked by a visible cathode band on the glass body - the banded end is the cathode terminal. Since the device uses a voidless-glass hermetic package with no surface marking other than the band, visual inspection under 10× magnification confirms orientation prior to placement. The anode connects to the unmarked end cap, and correct polarity is critical to avoid forward-conduction failure during Zener regulation.
JANTX1N4989CUS/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):
- 200 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 500 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 152 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
JANTX1N4989CUS/TR FAQ
1.How can I place an order for JANTX1N4989CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4989CUS/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 JANTX1N4989CUS/TR reliable?
The price and inventory of JANTX1N4989CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4989CUS/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4989CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4989CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTX1N4989CUS/TR?
JANTX1N4989CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4989CUS/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 JANTX1N4989CUS/TR?
For technical support, including JANTX1N4989CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4989CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4989CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4989CUS/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 JANTX1N4989CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4989CUS/TR?
All JANTX1N4989CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4989CUS/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 JANTX1N4989CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4989CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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