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Microchip Technology JANTX1N4990CUS/TR
- Part No.:
- JANTX1N4990CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4990CUS/TR.pdf
- Description:
- DIODE ZENER 220V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:3,614
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Product details
Overview
JANTX1N4990US/TR from Microsemi is a hermetically sealed, voidless-glass surface-mount 5 W Zener diode with nominal Zener voltage of 220 V, ±5% tolerance, and maximum dynamic impedance of 550 Ω at 5 mA test current. It operates across –65 °C to +175 °C and delivers stable voltage regulation in high-reliability military power conditioning circuits.
For engineers reviewing the JANTX1N4990US/TR datasheet, JANTX1N4990US/TR pinout, JANTX1N4990US/TR application, or JANTX1N4990US/TR equivalent, this part supports critical voltage reference and overvoltage clamping in aerospace power supplies, radiation-hardened instrumentation, and high-temperature avionics where failure is not tolerable.
Technical Context
This device belongs to the MIL-PRF-19500/356 qualified 1N4954US–1N4996US family and uses internal Category I metallurgical bonds for robust junction integrity. Its voidless-glass hermetic seal ensures zero moisture ingress and eliminates delamination risk under thermal cycling.
It exhibits a temperature coefficient of +0.115 %/°C at 5 mA, enabling predictable drift compensation in precision references. The 7 °C/W junction-to-end-cap thermal resistance supports reliable 5 W dissipation at end-cap temperature ≤140 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 220 V ±5% at 5 mA - defines precise clamping threshold for overvoltage protection |
| Power Dissipation | 5 W @ TEC = 140 °C - enables high-energy transient suppression without derating below 140 °C |
| Dynamic Impedance (ZZ) | 550 Ω max @ IZT = 5 mA - ensures low regulation error under load variation |
| Max Reverse Leakage (IR) | 2 μA @ VR = 167 V - guarantees minimal standby current in high-impedance bias networks |
| Temp Coefficient (αVZ) | +0.115 %/°C @ IZT = 5 mA - allows accurate drift modeling across –65 °C to +175 °C |
| Surge Current (IZSM) | 1.8 A @ 8.3 ms - withstands single-event lightning-induced transients per MIL-STD-1275 |
| Forward Voltage (VF) | 1.5 V @ 1.0 A - supports use as polarity-sensitive clamp in bidirectional protection schemes |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), with copper end caps finished in Sn/Pb, cathode indicated by band, weight 539 mg. Tape-and-reel compliant with EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to ground or low-side reference in shunt regulator configurations |
| Cathode | Current exit terminal in reverse breakdown | Connected to regulated rail; band-marked end cap serves as voltage reference node |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal voids to prevent moisture-driven corrosion and parameter shift over 20+ year lifetimes |
| Category I metallurgical bond | Ensures mechanical integrity of P-N junction under shock, vibration, and thermal cycling per MIL-STD-883 |
| Nonsensitive to ESD | Withstands ≥2 kV HBM without degradation - no external ESD protection required in board layout |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) up to 100 krad(Si), validated per MicroNote 050 |
| Triple-layer passivation | Prevents surface leakage paths on glass body, maintaining IR >100 MΩ after humidity exposure |
Applications
| Aerospace Power Bus Protection | Radiation-Hardened Instrumentation |
|---|---|
Use Scenario: Clamping 28 V DC aircraft bus against load dump spikes exceeding 100 V. IC Role / Device Role / Timing Role: Shunt Zener regulator acting as primary overvoltage clamp in DC-DC converter input stage. Use Value: Maintains bus integrity during MIL-STD-704F transient events without derating at +125 °C ambient. |
Use Scenario: Providing stable 220 V reference for high-voltage sensor front-ends in satellite telemetry systems. IC Role / Device Role / Timing Role: Precision voltage reference element in radiation-tolerant analog signal chains. Use Value: Delivers <2% voltage drift over 15-year mission life due to hermetic seal and TID immunity. |
| High-Temperature Avionics | Military Ground Vehicle Power Systems |
Use Scenario: Regulating auxiliary 220 V supply in engine-mounted control units operating at +175 °C junction temperature. IC Role / Device Role / Timing Role: Primary voltage stabilization component in high-temp DC-DC feedback loop. Use Value: Sustains regulation performance without thermal runaway, enabled by 7 °C/W thermal resistance and wide TJ range. |
Use Scenario: Suppressing 200 V transients on 24 V vehicle battery lines per MIL-STD-1275B. IC Role / Device Role / Timing Role: Transient voltage suppressor (TVS) in engine control module power input. Use Value: Absorbs 1.8 A surge at 8.3 ms without parametric shift, verified per automotive EMC testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4990US | Commercial-grade version; same Zener voltage, power, and package but lacks JAN/JANTX screening and radiation hardening | Not qualified to MIL-PRF-19500/356; unsuitable for flight-critical or space-rated designs | Select only for non-military industrial prototypes where cost and lead time outweigh reliability requirements |
| JANTXV1N4990US | Higher screening level (JANTXV); includes extended burn-in, 100% parametric testing, and tighter lot traceability | Required for Class H (spaceflight) and Class K (nuclear) applications per MIL-PRF-19500 | Choose when full radiation assurance, lot-level qualification data, and zero-defect history are mandated |
Compared with JANTX1N4990US/TR, the 1N4990US offers identical electrical behavior at lower cost but no military qualification, while JANTXV1N4990US adds process rigor and radiation validation-making it essential for mission-critical deployments where field failure is unacceptable.
Availability
JANTX1N4990US/TR is available at Aetrix Electronics and suitable for aerospace power bus protection, radiation-hardened instrumentation, and high-temperature avionics requiring stable component supply across extended product lifecycles.
Supply support for JANTX1N4990US/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 defense, aerospace, and industrial markets.
The JANTX1N4990US/TR belongs to Microsemi's legacy MIL-PRF-19500/356 Zener diode product line, engineered specifically for extreme-environment voltage regulation where hermeticity, radiation tolerance, and long-term stability are non-negotiable.
FAQ
What is the Zener voltage tolerance for JANTX1N4990US/TR?
JANTX1N4990US/TR has a nominal Zener voltage of 220 V with a standard tolerance of ±5%, as specified in the Microsemi SD44A datasheet. This tolerance applies at the test current of 5 mA and is guaranteed across the full operating temperature range of –65 °C to +175 °C. No suffix letter indicates the ±5% grade; tighter tolerances require C (±2%) or D (±1%) suffixes, which do not apply to JANTX1N4990US/TR.
Is JANTX1N4990US/TR suitable for surface-mount assembly with lead-free reflow?
JANTX1N4990US/TR features Sn/Pb-finished copper end caps and is rated for soldering per MIL-STD-202 Method 210. While its terminations are tin-lead, the voidless-glass construction withstands peak reflow temperatures up to 260 °C for 10 seconds. For lead-free processes, Microsemi recommends verifying compatibility with specific profile validation; the part itself is not lead-free qualified per JEDEC J-STD-020.
Does JANTX1N4990US/TR have radiation hardness certification?
Yes, JANTX1N4990US/TR is inherently radiation hard per Microsemi MicroNote 050, demonstrating tolerance to total ionizing dose (TID) up to 100 krad(Si) without functional degradation. It is not individually certified per MIL-STD-883 Method 1019, but its construction and material system meet the requirements for Class H space applications when used within qualified lot data.
What is the maximum continuous Zener current (IZM) for JANTX1N4990US/TR?
The maximum continuous Zener current for JANTX1N4990US/TR is 1.8 A, calculated from its 5 W power rating and 220 V Zener voltage (IZM = PZ/VZ). This value assumes operation at end-cap temperature ≤140 °C; above that, linear derating applies down to zero at +175 °C, per the SD44A datasheet absolute maximum ratings table.
How does the thermal resistance of JANTX1N4990US/TR compare to axial-leaded equivalents?
JANTX1N4990US/TR has a junction-to-end-cap thermal resistance of 7 °C/W, optimized for surface-mount thermal conduction through end caps. Axial-leaded equivalents (e.g., 1N4990) exhibit higher thermal resistance (~15–20 °C/W) due to wire-bond path limitations. This 2× improvement enables JANTX1N4990US/TR to sustain full 5 W dissipation at higher ambient temperatures in compact PCB layouts.
JANTX1N4990CUS/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:
- ±2%
- 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
JANTX1N4990CUS/TR FAQ
1.How can I place an order for JANTX1N4990CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4990CUS/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 JANTX1N4990CUS/TR reliable?
The price and inventory of JANTX1N4990CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4990CUS/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4990CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4990CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTX1N4990CUS/TR?
JANTX1N4990CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4990CUS/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 JANTX1N4990CUS/TR?
For technical support, including JANTX1N4990CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4990CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4990CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4990CUS/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 JANTX1N4990CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4990CUS/TR?
All JANTX1N4990CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4990CUS/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 JANTX1N4990CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4990CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JANTX1N4990CUS/TR Tags
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