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Microchip Technology JANS1N4984US/TR
- Part No.:
- JANS1N4984US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANS1N4984US/TR.pdf
- Description:
- DIODE ZENER 120V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:7,514
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Product details
Overview
JANS1N4984US/TR from Microsemi is a military-grade, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation, with a nominal Zener voltage of 120 V at 10 mA test current, ±5% tolerance, and maximum dynamic impedance of 170 Ω at IZT - designed for high-reliability voltage regulation in aerospace power conditioning circuits.
For engineers reviewing the JANS1N4984US/TR datasheet, JANS1N4984US/TR pinout, JANS1N4984US/TR application, or JANS1N4984US/TR equivalent, this part supports critical biasing, overvoltage clamping, and reference stabilization in radiation-hardened, high-temperature avionics subsystems where failure is not tolerable.
Technical Context
This device operates as a precision voltage reference and shunt regulator across a wide junction temperature range (–65 °C to +175 °C), leveraging voidless-glass hermetic sealing and Category I metallurgical bonds per MIL-PRF-19500/356. Its 120 V Zener voltage is stabilized by triple-layer passivation and exhibits low temperature coefficient (±0.100 %/°C) at IZT.
It delivers 1.0 A surge current capability at 8.3 ms square wave, with forward voltage ≤1.50 V at 1.0 A, and reverse leakage ≤2 μA at VR = 91.2 V - enabling robust operation under transient stress and extended thermal cycling in mission-critical platforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 120 V at 10 mA test current - sets precise regulation point for high-voltage bias networks |
| Power Dissipation | 5 W @ TEC = 140 °C - enables stable operation without derating below 140 °C ambient |
| Dynamic Impedance (ZZ) | 170 Ω at IZT - ensures minimal output voltage variation under load current shifts |
| Max Reverse Leakage (IR) | 2 μA at 91.2 V - guarantees negligible standby current in high-impedance reference paths |
| Temp Coefficient (αVZ) | ±0.100 %/°C - maintains voltage stability across –65 °C to +175 °C operating range |
| Surge Current (IZSM) | 1.0 A (8.3 ms square wave) - withstands lightning-induced transients in aircraft power buses |
| Forward Voltage (VF) | ≤1.50 V at 1.0 A - allows safe forward conduction during fault conditions without thermal runaway |
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, and EIA-481-B tape-and-reel compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to ground or low-side reference node in shunt regulation | Accepts up to 1.0 A forward current; must be thermally anchored to heatsink or PCB copper for 5 W operation |
| Cathode | Regulated output node in reverse breakdown; carries full Zener current during regulation | Banded end; connects to supply rail being clamped - requires low-inductance layout to suppress ringing |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture and particle migration - certified for 20+ year field life in vacuum/space environments |
| Category I metallurgical bond | Guarantees mechanical integrity under shock/vibration per MIL-STD-883 Method 2002 |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 - no external protection required in handling |
| Radiation hardness | Qualified to 100 krad(Si) total ionizing dose per MicroNote 050 - suitable for LEO satellite power systems |
| Triple-layer passivation | Prevents surface leakage and parameter drift in high-humidity or salt-fog military deployments |
Applications
| Aerospace Power Bus Clamping | Avionics Reference Voltage Generation |
|---|---|
|
Use Scenario: Suppressing 270 V DC bus transients in fly-by-wire control units during generator switching events. IC Role / Device Role / Timing Role: Shunt clamping element placed across primary bus rails to limit peak voltage to 120 V + margin. Use Value: Prevents damage to downstream FPGAs and ADCs by limiting overshoot to <135 V for durations ≤100 ms. |
Use Scenario: Providing stable 120 V reference for high-voltage DAC calibration in inertial measurement units. IC Role / Device Role / Timing Role: Precision Zener reference source feeding resistive divider network into instrumentation amplifier input. Use Value: Enables <±0.5% full-scale accuracy over –55 °C to +125 °C due to tight αVZ and low ZZ. |
| Military Radar Bias Supply | Satellite Payload HV Monitoring |
|
Use Scenario: Establishing fixed bias point for GaN RF power amplifier gate drivers in ground-based radar transmitters. IC Role / Device Role / Timing Role: High-stability Zener shunt regulating gate-source voltage under pulsed RF load conditions. Use Value: Maintains gate bias within ±1.2 V over 10⁶ pulse cycles, preventing gain compression or thermal runaway. |
Use Scenario: Scaling down 200 V solar array output for telemetry ADC input in geostationary communication satellites. IC Role / Device Role / Timing Role: Primary voltage divider element in radiation-hardened resistive scaling network. Use Value: Delivers <0.1% long-term drift over 15-year mission life due to hermetic seal and zero outgassing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4984US | Same electrical specs but qualified to JANTXV level (enhanced screening); higher burn-in and lot acceptance test rigor | Required for Class S spaceflight hardware; not approved for JANS-level radiation testing | Select JANS1N4984US/TR when total ionizing dose (TID) >100 krad(Si) is mandated |
| 1N4984US | Commercial-grade version; lacks MIL-PRF-19500/356 qualification, no radiation hardness data, lower screening | Suitable only for non-mission-critical industrial controls; not authorized for flight hardware | Choose JANS1N4984US/TR for DoD procurement, NASA Class D+, or nuclear facility instrumentation |
Compared with JANTXV1N4984US and 1N4984US, JANS1N4984US/TR provides verified radiation hardness, Category I bond certification, and full MIL-PRF-19500/356 compliance - making it the sole option for manned spacecraft power supervisors and strategic missile guidance references.
Availability
JANS1N4984US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, avionics reference generation, and military radar biasing requiring stable component supply across extended temperature and radiation environments.
Supply support for JANS1N4984US/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 JANS1N4984US/TR belongs to Microsemi's legacy MIL-PRF-19500/356 Zener diode family, engineered specifically for fail-safe voltage regulation in systems where single-point failure could compromise human safety or national security.
FAQ
What is the Zener voltage tolerance for JANS1N4984US/TR?
JANS1N4984US/TR has a nominal Zener voltage of 120 V with a standard tolerance of ±5%, as specified in the SD44A datasheet. No suffix indicates this 5% tolerance; tighter tolerances (e.g., ±2% or ±1%) require C or D suffixes not present in this part number. The JANS1N4984US/TR meets this specification across its full operating temperature range.
Is JANS1N4984US/TR radiation-hardened?
Yes, JANS1N4984US/TR is inherently radiation-hardened per Microsemi MicroNote 050, qualified to 100 krad(Si) total ionizing dose. This radiation tolerance is intrinsic to its voidless-glass construction and metallurgical bonding, and is explicitly documented for the JANS grade in the official SD44A datasheet.
What is the maximum continuous Zener current for JANS1N4984US/TR?
The maximum continuous Zener current (IZM) for JANS1N4984US/TR is 1.00 A, derived from its 5 W power rating and 120 V Zener voltage (P = V × I). This value is confirmed in the Electrical Characteristics table on page 2 of SD44A, where IZM = 1.00 A at TJ = 140 °C.
Does JANS1N4984US/TR have a defined forward voltage specification?
Yes, JANS1N4984US/TR specifies a maximum forward voltage (VF) of 1.50 V at 1.0 A forward current, per the Maximum Ratings table on page 1 of SD44A. This parameter ensures predictable behavior during fault conditions or polarity-reversal scenarios in protected power architectures.
What packaging format does JANS1N4984US/TR use?
JANS1N4984US/TR uses the hermetically sealed "E" package (also known as D-5B), featuring voidless hard glass construction, tungsten slugs, copper end caps with Sn/Pb finish, and cathode identification via band. It is supplied in EIA-481-B compliant tape-and-reel format, as stated in the Mechanical and Packaging section of SD44A.
JANS1N4984US/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):
- 120 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 170 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 91.2 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
JANS1N4984US/TR FAQ
1.How can I place an order for JANS1N4984US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4984US/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 JANS1N4984US/TR reliable?
The price and inventory of JANS1N4984US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4984US/TR is usually 5 days.
3.What payment methods are accepted for JANS1N4984US/TR?
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4.How is shipping managed for JANS1N4984US/TR?
JANS1N4984US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANS1N4984US/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 JANS1N4984US/TR?
For technical support, including JANS1N4984US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4984US/TR requirements.
6.How does Aetrix verify that JANS1N4984US/TR is sourced from the original manufacturer or authorized distributors?
All JANS1N4984US/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 JANS1N4984US/TR meets industry standards.
7.What is the process for return or replacement of JANS1N4984US/TR?
All JANS1N4984US/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4984US/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 JANS1N4984US/TR part is unused and in its original packaging.
Return procedure for JANS1N4984US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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