My Inquiry
My Account
Microchip Technology JANTX1N4985CUS/TR
- Part No.:
- JANTX1N4985CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4985CUS/TR.pdf
- Description:
- DIODE ZENER 130V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:6,639
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
JANTX1N4985US/TR from Microsemi is a military-grade, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with nominal Zener voltage of 130 V ±5%, dynamic impedance of 190 Ω at 10 mA test current, and maximum reverse leakage current of 2 μA at 104 V. It serves as a precision voltage reference and overvoltage clamp in high-reliability aerospace power conditioning circuits.
For engineers reviewing the JANTX1N4985US/TR datasheet, JANTX1N4985US/TR pinout, JANTX1N4985US/TR application, or JANTX1N4985US/TR equivalent, this part is selected for critical voltage regulation where radiation hardness, -65 °C to +175 °C operation, voidless-glass reliability, and MIL-PRF-19500/356 qualification are mandatory design requirements.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage regulation across 10%–50% of IZM (0.8–4.0 mA), exhibiting ΔVZ ≤ 11 V per specification. Its voidless-glass hermetic package uses tungsten slugs and copper end caps with Sn/Pb finish, enabling stable performance under thermal cycling and mechanical stress.
The JANTX1N4985US/TR belongs to the 1N4954US–1N4996US family, featuring Category I metallurgical bonds and triple-layer passivation. It delivers 130 V regulation with ±5% tolerance, 1.5 V forward voltage at 1.0 A, and thermal resistance of 7 °C/W junction-to-end-cap.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 130 V ±5% at 10 mA - defines precise clamping threshold for overvoltage protection in 100–150 V rail systems |
| Power Dissipation | 5 W @ TEC = 140 °C - supports sustained regulation in high-temperature avionics enclosures without derating below 140 °C |
| Dynamic Impedance ZZ | 190 Ω @ IZT = 10 mA - ensures low voltage variation (<11 V) across 0.8–4.0 mA operating range |
| Reverse Leakage IR | 2 μA @ VR = 104 V - guarantees minimal standby current in high-impedance bias networks |
| Operating Temperature | -65 °C to +175 °C - enables deployment in space-grade power supplies and jet engine control electronics |
| Forward Voltage VF | 1.50 V @ 1.0 A - allows use as polarity-sensitive rectifier in low-current auxiliary paths |
| Thermal Resistance | 7 °C/W junction-to-end-cap - permits direct thermal coupling to heatsink via end-cap soldering |
Pinout & Package
Package: Hermetically sealed voidless hard glass case with tungsten slugs; "E" package (also designated D-5B); cathode indicated by band; weight 539 mg; tape-and-reel compliant with EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Soldered to ground or low-potential node; carries full surge current during transient clamping |
| Cathode | Zener breakdown terminal / regulated output reference | Connected to protected rail; establishes 130 V reference point with <11 V regulation error across operating current |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture and particle migration, ensuring >20-year shelf life and zero parametric drift in vacuum environments |
| Category I metallurgical bond | Provides mechanical integrity under 20,000 g shock and 50 g rms vibration per MIL-STD-883 Method 2007 |
| Radiation hardness | Inherently tolerant to total ionizing dose ≥100 krad(Si) per MicroNote 050 - no shielding required in LEO satellite power rails |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling and assembly |
| Triple-layer passivation | Prevents surface leakage and corrosion in high-humidity, salt-fog, or atomic oxygen exposure conditions |
Applications
| Avionics Power Bus Regulation | Satellite Solar Array Controller |
|---|---|
|
Use Scenario: Stabilizing 120–140 V DC bus in airborne radar transmitter power supplies subject to wide temperature swings and vibration. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference and overvoltage clamp. Use Value: Maintains ±5% regulation across -55 °C to +125 °C ambient while surviving 15 g sinusoidal vibration per RTCA DO-160 Section 21. |
Use Scenario: Protecting MPPT controller inputs from solar array open-circuit transients up to 180 V in geostationary orbit. IC Role / Device Role / Timing Role: Primary overvoltage clamp on analog sensing input stage. Use Value: Withstands 100 krad(Si) TID without parameter shift and suppresses 8.3 ms surges up to 1.8 A per MIL-STD-750 Test Method 3013. |
| Military Vehicle Battery Monitor | Nuclear Instrumentation Front-End |
|
Use Scenario: Reference voltage generation for 24/28 V battery health monitoring in armored ground vehicles with 120 V auxiliary power systems. IC Role / Device Role / Timing Role: Precision Zener reference for ADC biasing and comparator thresholds. Use Value: Delivers stable 130 V reference with <2 μA leakage at 104 V, enabling 16-bit measurement accuracy over -40 °C to +85 °C. |
Use Scenario: High-voltage bias stabilization in gamma-ray spectrometer detector bias supplies operating in reactor containment buildings. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant 130 V supply for photomultiplier tube anode chain. Use Value: Operates continuously at +150 °C ambient with no degradation; certified to MIL-PRF-19500/356 Class JANTX for mission-critical nuclear safety systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4985US/TR | Higher screening level: JANTXV per MIL-PRF-19500/356 includes burn-in, 100% parametric testing, and lot acceptance testing | Required for flight-critical subsystems where zero latent defects are mandated (e.g., launch vehicle telemetry) | Select JANTXV1N4985US/TR when full MIL-PRF-19500/356 Class V screening is specified in the system FMEA |
| 1N4985US/TR | Commercial-grade version; same electrical specs but no MIL-qualified screening or radiation data | Suitable only for non-safety-critical industrial controls with ambient <125 °C and no radiation exposure | Choose 1N4985US/TR only for cost-sensitive ground-test equipment where MIL-spec is not contractually required |
Compared with JANTX1N4985US/TR, JANTXV1N4985US/TR adds full burn-in and lot acceptance testing for zero-defect assurance in manned spaceflight, while 1N4985US/TR omits all military screening-making it unsuitable for any application requiring MIL-PRF-19500 compliance or radiation tolerance.
Availability
JANTX1N4985US/TR is available at Aetrix Electronics and suitable for avionics power regulation, satellite solar array protection, and nuclear instrumentation requiring stable component supply with guaranteed long-term obsolescence management.
Supply support for JANTX1N4985US/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 core expertise in radiation-hardened and hermetically sealed components.
The JANTX1N4985US/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener diode family, engineered specifically for voltage regulation in mission-critical power systems where failure is not an option.
FAQ
What is the Zener voltage tolerance for JANTX1N4985US/TR?
JANTX1N4985US/TR has a nominal Zener voltage of 130 V with a standard tolerance of ±5%, as defined in MIL-PRF-19500/356. This tolerance applies at 25 °C with test current IZT = 10 mA and is maintained across the full -65 °C to +175 °C operating junction temperature range per the official Microsemi SD44A datasheet.
Does JANTX1N4985US/TR require external heat sinking?
JANTX1N4985US/TR does not require external heat sinking when operated at ≤5 W within its specified thermal envelope: it achieves 5 W dissipation at TEC = 140 °C with a junction-to-end-cap thermal resistance of 7 °C/W. Proper PCB copper pour under the end caps provides sufficient conduction path; forced air or additional heatsinks are unnecessary unless ambient exceeds 140 °C.
Is JANTX1N4985US/TR radiation hardened?
Yes, JANTX1N4985US/TR is inherently radiation hard per Microsemi MicroNote 050, with documented tolerance to total ionizing dose (TID) ≥100 krad(Si). This radiation hardness stems from its voidless-glass hermetic construction and Category I metallurgical bond-not from process-level hardening-making it suitable for LEO satellite power systems without supplemental shielding.
What is the maximum surge current rating for JANTX1N4985US/TR?
JANTX1N4985US/TR supports a nonrepetitive peak Zener surge current (IZSM) of 1.8 A for an 8.3 ms half-sine wave, as specified in the SD44A datasheet. This rating enables reliable suppression of lightning-induced transients and load-dump spikes in 120 V avionics buses without degradation.
How is polarity identified on JANTX1N4985US/TR?
JANTX1N4985US/TR uses a cathode band for polarity identification: the banded end is the cathode, which must be connected to the higher-potential node (e.g., regulated rail), while the unbanded end is the anode, connected to ground or lower potential. This marking is visible on the voidless-glass body and aligns with JEDEC-standard orientation for surface-mount Zeners.
JANTX1N4985CUS/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):
- 130 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 190 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 98.8 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
JANTX1N4985CUS/TR FAQ
1.How can I place an order for JANTX1N4985CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4985CUS/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 JANTX1N4985CUS/TR reliable?
The price and inventory of JANTX1N4985CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4985CUS/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4985CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4985CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTX1N4985CUS/TR?
JANTX1N4985CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4985CUS/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 JANTX1N4985CUS/TR?
For technical support, including JANTX1N4985CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4985CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4985CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4985CUS/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 JANTX1N4985CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4985CUS/TR?
All JANTX1N4985CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4985CUS/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 JANTX1N4985CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4985CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JANTX1N4985CUS/TR Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
