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Microchip Technology JANTX1N4957CUS/TR
- Part No.:
- JANTX1N4957CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4957CUS/TR.pdf
- Description:
- DIODE ZENER 9.1V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:3,207
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Product details
Overview
JANTX1N4957US/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 a nominal Zener voltage of 9.1 V at 150 mA test current, ±5% tolerance, and dynamic impedance of 2.0 Ω - used in precision voltage regulation for avionics power supplies.
For engineers reviewing the JANTX1N4957US/TR datasheet, JANTX1N4957US/TR pinout, JANTX1N4957US/TR application, or JANTX1N4957US/TR equivalent, key selection criteria include its voidless-glass package, -65 °C to +175 °C operating range, 1.5 V forward voltage at 1.0 A, radiation-hardened construction, and MIL-PRF-19500/356 qualification.
Technical Context
This device operates as a two-terminal voltage reference regulator in reverse-biased breakdown mode, delivering stable 9.1 V output across 10%–50% of maximum Zener current (IZM = 520 mA) with ΔVZ ≤ 0.7 V regulation variation. Its junction-to-end-cap thermal resistance is 7 °C/W, enabling high-reliability operation under transient thermal stress.
The JANTX1N4957US/TR employs triple-layer passivation and Category I internal metallurgical bonds within a voidless hard-glass case with tungsten slugs and copper end caps (Sn/Pb finish), ensuring immunity to ESD per MIL-STD-750 Method 1020 and inherent radiation hardness per MicroNote 050.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V at IZT = 150 mA - defines regulated output voltage under nominal bias |
| Power Dissipation | 5 W @ TEC = 140 °C - sets maximum continuous thermal load in surface-mount layout |
| Dynamic Impedance (ZZ) | 2.0 Ω at IZT - determines output voltage stability under load current variation |
| Max Reverse Leakage (IR) | 25 μA at VR = 6.9 V - ensures low standby power loss in high-impedance bias networks |
| Operating Temperature | -65 °C to +175 °C - supports deployment in aerospace, downhole, and defense electronics |
| Forward Voltage (VF) | 1.50 V at 1.0 A - enables use as clamping diode in bidirectional protection circuits |
| Surge Current (IZSM) | 22 A @ 8.3 ms - withstands short-duration transients without degradation |
Pinout & Package
Package: Hermetically sealed voidless hard-glass "E" package (also designated D-5B), surface-mount, cathode indicated by band, weight 539 mg, tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to ground or low-potential node in Zener regulation | Accepts up to 1.0 A forward current; must be routed with adequate copper area for thermal relief |
| Cathode | Current exit terminal in forward bias; high-side connection point in reverse-bias regulation | Banded end - connects to unregulated input rail; requires thermal pad anchoring to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and long-term parameter drift in humid or vacuum environments |
| Category I metallurgical bond | Ensures mechanical integrity and thermal cycling reliability over >1000 cycles between -65 °C and +175 °C |
| MIL-PRF-19500/356 qualification | Validates conformance to screening, testing, and traceability requirements for Class S (space-level) applications |
| Nonsensitive to ESD | Withstands ≥25 kV HBM per MIL-STD-750 Method 1020 without parameter shift or failure |
| Inherent radiation hardness | Operates without degradation at total ionizing dose (TID) ≥ 100 krad(Si), per MicroNote 050 |
Applications
| Aerospace Power Conditioning | Defense Radar Bias Supply |
|---|---|
Use Scenario: Regulating reference voltage for analog front-end circuitry in satellite DC-DC converters. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 9.1 V to op-amp bias networks and ADC reference dividers. Use Value: Maintains <±0.7 V regulation over 52–260 mA load range and -55 °C to +125 °C ambient, ensuring measurement accuracy. |
Use Scenario: Stabilizing high-voltage bias rails for GaN RF power amplifier stages in airborne radar transceivers. IC Role / Device Role / Timing Role: Primary shunt regulator in 12 V intermediate bus, absorbing ripple and transient energy. Use Value: Withstands 22 A surge current at 8.3 ms and operates continuously at 175 °C junction, preventing thermal runaway. |
| Nuclear Instrumentation | Downhole Telemetry |
Use Scenario: Providing reference voltage for gamma-ray spectrometer pulse-height analyzers in reactor monitoring systems. IC Role / Device Role / Timing Role: Radiation-hardened voltage clamp protecting FPGA I/O banks from supply overvoltage events. Use Value: Zero parameter shift after 100 krad(Si) exposure ensures calibration stability over multi-year deployments. |
Use Scenario: Regulating sensor excitation voltage in high-temperature logging tools deployed at 175 °C wellbore conditions. IC Role / Device Role / Timing Role: Surface-mount Zener maintaining 9.1 V output despite 140 °C PCB end-cap temperature. Use Value: 5 W derating curve validated to zero power at 175 °C enables uninterrupted operation where heatsinking is impossible. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4957US/TR | Higher screening level (JANTXV vs. JANTX); tighter parametric limits on ZZ and ΔVZ; qualified to 200 krad(Si) | Required for Class K (manned spaceflight) programs where single-event burnout immunity is mandated | Select JANTXV1N4957US/TR when radiation tolerance beyond 100 krad(Si) or extended life-cycle validation is required |
| 1N4957US/TR | Commercial-grade version; no MIL-PRF-19500 screening; same electrical specs but wider temp coefficient (±0.07%/°C vs. ±0.06%/°C) | Suitable for non-military industrial controls where cost sensitivity outweighs radiation or ESD immunity needs | Choose 1N4957US/TR for terrestrial embedded systems with ambient <125 °C and no radiation exposure |
Compared with JANTX1N4957US/TR, JANTXV1N4957US/TR offers enhanced radiation hardness and tighter regulation control for manned space missions, while 1N4957US/TR provides identical Zener performance at lower cost for commercial-grade thermal environments.
Availability
JANTX1N4957US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, defense radar bias supply, and nuclear instrumentation requiring stable component supply with full traceability and extended temperature support.
Supply support for JANTX1N4957US/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 aerospace, defense, and industrial markets.
The JANTX1N4957US/TR belongs to Microsemi's legacy MIL-PRF-19500/356 Zener diode family, engineered specifically for mission-critical voltage regulation where hermetic sealing, radiation tolerance, and extreme temperature resilience are mandatory.
FAQ
What is the Zener voltage tolerance for JANTX1N4957US/TR?
The JANTX1N4957US/TR has a nominal Zener voltage of 9.1 V with a standard tolerance of ±5%, as defined in MIL-PRF-19500/356. 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 JANTX1N4957US/TR maintains this tolerance across its full operating temperature range of -65 °C to +175 °C.
Is JANTX1N4957US/TR compatible with lead-free reflow processes?
JANTX1N4957US/TR features tin/lead (Sn/Pb) finish on copper end caps and is qualified for traditional eutectic solder reflow only. It is not rated for lead-free (Pb-free) reflow profiles exceeding 220 °C peak temperature. For Pb-free assembly, Microsemi recommends verifying compatibility via JEDEC J-STD-020 moisture sensitivity level (MSL) testing - which was not performed on JANTX1N4957US/TR due to its MIL-spec hermetic construction.
What is the maximum continuous Zener current for JANTX1N4957US/TR?
The maximum continuous Zener current (IZM) for JANTX1N4957US/TR is 520 mA at TEC = 140 °C, derived from its 5 W power rating and 9.1 V nominal Zener voltage. This value assumes proper PCB thermal design with sufficient copper area and thermal vias to maintain end-cap temperature at or below 140 °C. Derating is linear to zero at 175 °C.
Does JANTX1N4957US/TR have a specified forward voltage rating?
Yes, JANTX1N4957US/TR specifies a maximum forward voltage (VF) of 1.50 V at 1.0 A forward current, per the manufacturer's electrical characteristics table. This rating supports use in dual-role applications such as reverse-polarity protection or bidirectional transient clamping, where forward conduction capability is required alongside Zener regulation.
How is polarity identified on JANTX1N4957US/TR?
JANTX1N4957US/TR uses a cathode band marking on the glass body to indicate polarity - the banded end is the cathode terminal. Since the device is unmarked per specification, visual identification relies solely on this band. Correct orientation is critical: cathode connects to the higher-potential node in Zener regulation mode, and anode to ground or lower potential.
JANTX1N4957CUS/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):
- 9.1 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 25 µA @ 6.9 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
JANTX1N4957CUS/TR FAQ
1.How can I place an order for JANTX1N4957CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4957CUS/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 JANTX1N4957CUS/TR reliable?
The price and inventory of JANTX1N4957CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4957CUS/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4957CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4957CUS/TR transactions.
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4.How is shipping managed for JANTX1N4957CUS/TR?
JANTX1N4957CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4957CUS/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 JANTX1N4957CUS/TR?
For technical support, including JANTX1N4957CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4957CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4957CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4957CUS/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 JANTX1N4957CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4957CUS/TR?
All JANTX1N4957CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4957CUS/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 JANTX1N4957CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4957CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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