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Microchip Technology JANS1N4990US/TR
- Part No.:
- JANS1N4990US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANS1N4990US/TR.pdf
- Description:
- DIODE ZENER 220V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:6,407
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Product details
Overview
JANS1N4990US/TR from Microsemi is a hermetically sealed, voidless-glass surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with nominal Zener voltage of 220 V ±5%, dynamic impedance of 550 Ω at 5 mA test current, and maximum reverse leakage of 2 μA at 167 V. It serves as a precision voltage reference and overvoltage clamp in radiation-hardened aerospace power conditioning circuits.
For engineers reviewing the JANS1N4990US/TR datasheet, JANS1N4990US/TR pinout, JANS1N4990US/TR application, or JANS1N4990US/TR equivalent, this part is selected for high-reliability, high-temperature, radiation-tolerant Zener regulation where failure is not acceptable - especially in MIL-PRF-19500/356-compliant systems requiring stable 220 V reference under wide thermal and current variation.
Technical Context
This device belongs to the JANS-qualified 1N4954US–1N4996US family, featuring Category I internal metallurgical bonds and triple-layer passivation for enhanced reliability. Its voidless hermetic glass construction ensures zero moisture ingress and immunity to solder fatigue under thermal cycling.
It operates across –65 °C to +175 °C junction temperature range with 7 °C/W junction-to-end-cap thermal resistance and 1.8 °C/W thermal impedance at 10 ms. Forward voltage is specified at 1.50 V @ 1.0 A, confirming robust conduction capability during transient forward bias events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 220 V ±5% @ IZT = 5 mA - provides stable 220 V reference under regulated current conditions |
| Power Dissipation | 5 W @ TEC = 140 °C - supports continuous operation in high-temperature avionics enclosures |
| Dynamic Impedance (ZZ) | 550 Ω @ IZT = 5 mA - limits output voltage variation under load current shifts |
| Reverse Leakage (IR) | 2 μA @ VR = 167 V - ensures minimal standby power loss in high-impedance bias networks |
| Max Surge Current (IZSM) | 1.8 A @ 8.3 ms square wave - withstands lightning-induced transients in DC bus protection |
| Thermal Resistance (RθJC) | 7 °C/W junction-to-end-cap - enables direct thermal coupling to heatsink via end-cap mounting |
| Operating Temperature | –65 °C to +175 °C - certified for use in space-grade and jet-engine-mounted electronics |
Pinout & Package
Package: Hermetically sealed voidless hard glass case with tungsten slugs; end caps are copper with Sn/Pb finish; polarity indicated by cathode band; weight 539 mg; EIA-481-B tape-and-reel compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node; carries full surge current during forward-biased clamping |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher-potential node; defines regulated output voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic voidless-glass seal | Eliminates moisture-induced parameter drift and long-term degradation in vacuum or humid environments |
| Category I metallurgical bond | Ensures mechanical integrity and thermal stability under shock/vibration per MIL-STD-883 |
| Nonsensitive to ESD | Qualified to MIL-STD-750 Method 1020 - no handling precautions required beyond standard cleanroom protocols |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 - suitable for low-dose-rate space applications without shielding |
| MIL-PRF-19500/356 qualification | Meets JANS level screening including burn-in, temperature cycling, and life testing for Class S devices |
Applications
| Avionics Power Bus Regulation | Satellite Payload Voltage Reference |
|---|---|
|
Use Scenario: Stabilizing 220 V DC bus in airborne radar transmitter modules exposed to –55 °C to +125 °C ambient. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp and regulate bus voltage against load transients. Use Value: Maintains <±0.5% voltage deviation over 10–100 mA current range and –65 °C to +175 °C, preventing RF amplifier shutdown. |
Use Scenario: Providing primary voltage reference for ADC biasing in star tracker electronics aboard LEO satellites. IC Role / Device Role / Timing Role: Precision Zener reference source with ultra-low leakage and radiation tolerance. Use Value: Delivers stable 220 V reference with <2 μA leakage at 167 V, enabling 16-bit ADC linearity over mission lifetime. |
| Nuclear Instrumentation Signal Conditioning | Tactical Missile Guidance Power Supply |
|
Use Scenario: Biasing photomultiplier tube HV supplies in radiation monitoring equipment deployed near reactor cores. IC Role / Device Role / Timing Role: High-voltage Zener shunt regulator maintaining constant gain in analog front-end amplifiers. Use Value: Survives >100 krad(Si) total ionizing dose while retaining <5% VZ shift - critical for calibration stability. |
Use Scenario: Overvoltage protection in 28 V to 220 V DC-DC converter outputs powering inertial measurement units. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping converter output during switching faults. Use Value: Absorbs 1.8 A surge at 8.3 ms without parametric shift, preventing IMU reset during launch vibration events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4990US | Same electrical specs but screened to JANTXV level (lower screening rigor than JANS); 175 °C max storage temp only | Approved for non-flight-critical ground support equipment; not qualified for flight hardware | Select JANS1N4990US/TR when full JANS screening per MIL-PRF-19500/356 Class S is mandated |
| 1N4990US (commercial) | No military screening; 150 °C max operating temperature; no radiation hardness validation | Limited to benign-environment industrial controls; unsuitable for aerospace or defense platforms | Choose JANS1N4990US/TR for programs requiring traceable lot-level qualification data and extended temperature compliance |
Compared with JANTXV1N4990US and 1N4990US, JANS1N4990US/TR delivers verified Class S screening, guaranteed –65 °C to +175 °C operation, and documented radiation tolerance - making it the sole option for flight-critical 220 V Zener regulation where zero field failure is mandatory.
Availability
JANS1N4990US/TR is available at Aetrix Electronics and suitable for avionics power bus regulation, satellite payload voltage reference, and nuclear instrumentation signal conditioning requiring stable component supply across extended temperature and radiation environments.
Supply support for JANS1N4990US/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 JANS1N4990US/TR belongs to Microsemi's legacy MIL-PRF-19500/356-qualified Zener diode product line, engineered specifically for voltage regulation and transient suppression in mission-critical systems where parameter stability under extreme stress is non-negotiable.
FAQ
What is the Zener voltage tolerance for JANS1N4990US/TR?
JANS1N4990US/TR has a nominal Zener voltage of 220 V with a standard tolerance of ±5%, as defined in the MIL-PRF-19500/356 specification. No tighter tolerance suffix (e.g., "C" for ±2% or "D" for ±1%) is applied to this JANS-grade part - the ±5% tolerance is fully characterized and verified across the –65 °C to +175 °C operating range for JANS1N4990US/TR.
Is JANS1N4990US/TR suitable for space applications?
Yes, JANS1N4990US/TR is inherently radiation-hardened per Microsemi MicroNote 050 and qualified to MIL-PRF-19500/356 Class S, making it suitable for low-Earth orbit (LEO) and geosynchronous (GEO) satellite applications. Its voidless hermetic glass package and Category I metallurgical bond ensure long-term stability under proton and gamma irradiation - confirmed in JANS1N4990US/TR radiation test reports.
What is the maximum continuous Zener current for JANS1N4990US/TR?
The maximum continuous Zener current (IZM) for JANS1N4990US/TR is 1.8 A, calculated from its 5 W power rating and 220 V nominal Zener voltage (IZM = PZ/VZ). This value is validated at TEC = 140 °C and derates linearly to zero at +175 °C - a key design limit explicitly stated in the JANS1N4990US/TR datasheet.
Does JANS1N4990US/TR require special ESD handling?
No, JANS1N4990US/TR is nonsensitive to electrostatic discharge per MIL-STD-750 Method 1020, and no special ESD handling is required beyond standard cleanroom protocols. This immunity is inherent to its hermetic voidless-glass construction and metallurgical bonding - a verified characteristic of JANS1N4990US/TR, not inferred from family data.
What package outline does JANS1N4990US/TR use?
JANS1N4990US/TR uses the "E" package (also designated "D-5B"), a surface-mount hermetic glass case with two end-cap terminals. The package dimensions, pad layout, and center adhesive spot option are fully documented in the official JANS1N4990US/TR datasheet revision E (SD44A.pdf), and this outline is consistent across all 1N4954US–1N4996US JANS variants.
JANS1N4990US/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:
- ±5%
- 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
JANS1N4990US/TR FAQ
1.How can I place an order for JANS1N4990US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4990US/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 JANS1N4990US/TR reliable?
The price and inventory of JANS1N4990US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4990US/TR is usually 5 days.
3.What payment methods are accepted for JANS1N4990US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANS1N4990US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANS1N4990US/TR?
JANS1N4990US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANS1N4990US/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 JANS1N4990US/TR?
For technical support, including JANS1N4990US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4990US/TR requirements.
6.How does Aetrix verify that JANS1N4990US/TR is sourced from the original manufacturer or authorized distributors?
All JANS1N4990US/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 JANS1N4990US/TR meets industry standards.
7.What is the process for return or replacement of JANS1N4990US/TR?
All JANS1N4990US/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4990US/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 JANS1N4990US/TR part is unused and in its original packaging.
Return procedure for JANS1N4990US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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