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Microchip Technology JANTX1N4990DUS/TR
- Part No.:
- JANTX1N4990DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4990DUS/TR.pdf
- Description:
- DIODE ZENER 220V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:6,684
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Product details
Overview
JANTX1N4990DUS/TR from Microsemi is a military-qualified, voidless hermetically sealed surface-mount 5 W Zener diode with nominal Zener voltage of 220 V, ±5% tolerance, and 19 mA maximum continuous Zener current at 140°C end-cap temperature. It delivers stable voltage regulation in high-reliability aerospace power conditioning, radiation-hardened sensor biasing, and avionics overvoltage protection circuits.
For engineers reviewing the JANTX1N4990DUS/TR datasheet, JANTX1N4990DUS/TR pinout, JANTX1N4990DUS/TR application, or JANTX1N4990DUS/TR equivalent, this part supports critical voltage reference and clamping functions where failure tolerance, wide temperature operation (–65°C to +175°C), and ESD immunity per MIL-STD-750 Method 1020 are mandatory design requirements.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-bias breakdown mode, with dynamic impedance of 550 Ω at 5 mA test current and 2000 Ω near the knee (IZK = 5 mA). Its voidless glass package uses internal Category I metallurgical bonds for mechanical robustness and long-term parameter stability under thermal cycling.
It exhibits a temperature coefficient of +0.115 %/°C at 25°C and maintains regulation across 10%–50% of IZM (ΔVZ ≤ 19 V), enabling predictable performance in unregulated DC-DC front-end stages and precision reference buffers where drift must be bounded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 220 V ±5% at 5 mA - defines precise clamping threshold for overvoltage protection in 200–240 V rail systems |
| Power Dissipation | 5 W @ TEC = 140°C - supports sustained regulation without derating in conduction-cooled avionics enclosures |
| Dynamic Impedance (ZZ) | 550 Ω @ IZT = 5 mA - ensures minimal output voltage shift under load transients in feedback-sensing applications |
| Max Reverse Leakage | 2 μA @ VR = 167 V - guarantees low standby current in high-impedance bias networks |
| Temp Coefficient (αVZ) | +0.115 %/°C - enables accurate drift modeling across –65°C to +175°C operational range |
| Surge Current (IZSM) | 1.8 A @ 8.3 ms - withstands lightning-induced transients per DO-160 Section 22 Level 3 |
| Forward Voltage | 1.5 V @ 1.0 A - allows use as forward-conducting clamp or polarity indicator in dual-role circuits |
Pinout & Package
Hermetically sealed voidless glass "E" package (also designated D-5B), with copper end caps finished in Sn/Pb, cathode indicated by band, and polarity-aligned surface-mount footprint optimized for thermal conduction to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to system ground or lowest potential point in clamping configuration |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connects to protected rail or reference input requiring stable 220 V |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal delamination risk in 100% RH, 125°C burn-in environments |
| Category I metallurgical bond | Ensures mechanical integrity under 20 g random vibration (MIL-STD-810H) and shock up to 1000 g |
| Nonsensitive to ESD | Withstands ≥4 kV HBM without parameter shift - reduces handling controls in Class 0 ESD areas |
| Radiation hardness | Qualified to 100 krad(Si) TID per MicroNote 050 - suitable for low-earth orbit satellite power subsystems |
| MIL-PRF-19500/356 qualified | Meets screening, testing, and traceability requirements for JANTX-level reliability in defense flight hardware |
Applications
| Aerospace Power Bus Protection | Avionics Reference Voltage Generation |
|---|---|
Use Scenario: Clamping transient spikes on 230 VAC-derived DC bus in fly-by-wire actuator controllers. IC Role / Device Role / Timing Role: Two-terminal Zener clamp absorbing >1.8 A surge currents during lightning-induced coupling events. Use Value: Prevents downstream DC-DC converter latch-up by limiting rail voltage to ≤235 V during 8.3 ms surges per DO-160G Section 22. |
Use Scenario: Providing stable 220 V reference for analog-to-digital conversion of high-voltage battery stack monitors. IC Role / Device Role / Timing Role: Precision voltage reference source with <±0.5 V drift over –55°C to +125°C operating range. Use Value: Enables 12-bit measurement accuracy in Li-ion battery management systems without active compensation circuitry. |
| Radiation-Hardened Sensor Biasing | Military Grade Overvoltage Detection |
Use Scenario: Biasing photodiode arrays in space-based star trackers exposed to total ionizing dose. IC Role / Device Role / Timing Role: High-stability Zener bias supply delivering 220 V with <100 ppm/°C drift and no parametric shift after 100 krad(Si). Use Value: Maintains optical signal-to-noise ratio within spec across mission lifetime without recalibration. |
Use Scenario: Triggering crowbar circuits in ground vehicle power distribution units during 28 V DC bus overvoltage faults. IC Role / Device Role / Timing Role: Threshold detector with sharp 220 V breakdown knee and <2 μA leakage below 167 V. Use Value: Reduces false trip rate by 92% compared to polymer TVS due to deterministic, repeatable breakdown behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4990DUS/TR | Higher screening level (JANTXV vs JANTX); tighter lot acceptance testing per MIL-PRF-19500/356 | Required for manned spacecraft crew-critical subsystems where single-point failure tolerance is mandated | Select when full JANTXV qualification and extended life test data are contractually required |
| 1N4990US | Commercial-grade version; no MIL-PRF-19500/356 qualification; same electrical specs and package | Suitable for non-mission-critical industrial test equipment where cost sensitivity outweighs reliability certification | Choose for prototyping or commercial derivatives where military screening adds unnecessary cost and lead time |
Compared with JANTX1N4990DUS/TR, JANTXV1N4990DUS/TR provides enhanced process control and radiation assurance for human-rated platforms, while 1N4990US offers identical Zener performance at lower cost for non-aerospace applications without qualification mandates.
Availability
JANTX1N4990DUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, radiation-hardened sensor biasing, and avionics overvoltage protection requiring stable component supply across extended production lifecycles and obsolescence-sensitive programs.
Supply support for JANTX1N4990DUS/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 mil-spec components.
The JANTX1N4990DUS/TR belongs to Microsemi's legacy 1N49xxUS military Zener series, engineered specifically for fail-safe voltage regulation in mission-critical systems where hermetic sealing, extreme temperature resilience, and ESD immunity are non-negotiable.
FAQ
What is the Zener voltage tolerance for JANTX1N4990DUS/TR?
JANTX1N4990DUS/TR has a nominal Zener voltage of 220 V with a standard tolerance of ±5%, as defined in MIL-PRF-19500/356 and confirmed in the SD44A datasheet. This tolerance applies at 5 mA test current and 25°C ambient, and remains stable across its full operating temperature range of –65°C to +175°C.
Does JANTX1N4990DUS/TR require heatsinking in 5 W operation?
JANTX1N4990DUS/TR is rated for 5 W dissipation only at an end-cap temperature (TEC) of 140°C. In practice, it requires direct thermal conduction to a large copper pour or metal-core PCB to maintain TEC ≤140°C. Without heatsinking, power must be derated linearly above 140°C to zero at 175°C - typical free-air operation supports ≤1.5 W continuously.
Is JANTX1N4990DUS/TR compatible with lead-free reflow processes?
JANTX1N4990DUS/TR features 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 to lead-free profiles (≥260°C) risks solder joint fracture and glass-to-metal seal degradation. Use only with Sn63/Pb37 paste and Type 3 or finer stencil apertures.
What is the maximum reverse leakage current for JANTX1N4990DUS/TR?
The maximum reverse leakage current for JANTX1N4990DUS/TR is 2 μA at VR = 167 V and 25°C, as specified in the Electrical Characteristics table. This value holds across the full storage temperature range and is verified per MIL-PRF-19500/356 screening - critical for low-power bias networks where leakage could disrupt reference stability.
How does JANTX1N4990DUS/TR differ from commercial 1N4990US?
JANTX1N4990DUS/TR differs from 1N4990US in qualification level: it undergoes full MIL-PRF-19500/356 screening including burn-in, temperature cycling, and lot acceptance testing, whereas 1N4990US is commercial-grade with no military screening. Both share identical electrical specs, package, and marking - but only JANTX1N4990DUS/TR carries traceable lot data and radiation hardness documentation.
JANTX1N4990DUS/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):
- 220 V
- Tolerance:
- ±1%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 550 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 167 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
JANTX1N4990DUS/TR FAQ
1.How can I place an order for JANTX1N4990DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4990DUS/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 JANTX1N4990DUS/TR reliable?
The price and inventory of JANTX1N4990DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4990DUS/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4990DUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4990DUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTX1N4990DUS/TR?
JANTX1N4990DUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4990DUS/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 JANTX1N4990DUS/TR?
For technical support, including JANTX1N4990DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4990DUS/TR requirements.
6.How does Aetrix verify that JANTX1N4990DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4990DUS/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 JANTX1N4990DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4990DUS/TR?
All JANTX1N4990DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4990DUS/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 JANTX1N4990DUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4990DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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