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Microchip Technology JANTXV1N4957DUS/TR
- Part No.:
- JANTXV1N4957DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTXV1N4957DUS/TR.pdf
- Description:
- DIODE ZENER 9.1V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:6,919
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Product details
Overview
JANTXV1N4957DUS/TR from Microsemi is a military-grade, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation, with nominal Zener voltage of 9.1 V at 150 mA test current, dynamic impedance of 2.0 Ω, and maximum reverse leakage of 25 μA at 6.9 V. It operates from –65 °C to +175 °C and is used in high-reliability voltage regulation circuits for aerospace power conditioning and radiation-hardened instrumentation.
For engineers reviewing the JANTXV1N4957DUS/TR datasheet, JANTXV1N4957DUS/TR pinout, JANTXV1N4957DUS/TR application, or JANTXV1N4957DUS/TR equivalent, key selection criteria include its MIL-PRF-19500/356 qualification, voidless-glass hermetic package, ±5% voltage tolerance (D suffix), and 7 °C/W junction-to-end-cap thermal resistance - critical for thermal design in constrained, high-temperature environments.
Technical Context
This device belongs to the 1N4954US–1N4996US family of glass-passivated, surface-mount Zener regulators. It uses an internal Category I metallurgical bond and triple-layer passivation to ensure robustness against humidity, thermal cycling, and radiation exposure. Its construction eliminates voids in the hermetic seal, preventing internal corrosion and parameter drift over time.
The JANTXV1N4957DUS/TR is specified for stable regulation across wide current (10%–50% of IZM) and temperature ranges. Its low dynamic impedance (2.0 Ω @ 150 mA) and tight voltage regulation (ΔVZ ≤ 0.7 V) enable precise reference stability in analog monitoring and feedback loops where supply noise rejection matters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V at 150 mA test current - defines regulated output voltage under nominal bias conditions. |
| Power Dissipation | 5 W @ TEC = 140 °C - sets maximum continuous thermal load before derating begins. |
| Dynamic Impedance (ZZ) | 2.0 Ω @ IZT = 150 mA - determines AC ripple rejection and regulation sensitivity to load transients. |
| Max Reverse Leakage (IR) | 25 μA @ VR = 6.9 V - ensures minimal standby current in high-impedance sensing paths. |
| Thermal Resistance (RθJC) | 7 °C/W junction-to-end-cap - enables accurate thermal modeling when mounted on copper pads or heat-spreading substrates. |
| Operating Temperature | –65 °C to +175 °C - supports deployment in extreme-environment avionics, downhole tools, and space-qualified electronics. |
| Forward Voltage (VF) | 1.50 V @ 1.0 A - defines conduction loss during forward-bias fault conditions or polarity protection use cases. |
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 compliant. Known as "E" or "D-5B" package per Microsemi SD44A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; carries full surge current during transient clamping. |
| Cathode | Zener breakdown terminal | Marked with band; connected to regulated output node; referenced to system ground or bias rail in shunt regulator topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture ingress and long-term parameter drift - essential for >20-year mission life in sealed modules. |
| Category I metallurgical bond | Ensures mechanical integrity under shock/vibration and thermal cycling up to 1000 cycles between –65 °C and +175 °C. |
| Triple-layer passivation | Provides immunity to surface contamination and ion migration in high-humidity or salt-fog environments. |
| Nonsensitive to ESD | Qualified to MIL-STD-750 Method 1020 - no special handling required during board assembly or field maintenance. |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) per Microsemi MicroNote 050 - suitable for low-earth orbit and nuclear instrumentation. |
Applications
| Aerospace Power Bus Regulation | Radiation-Hardened Sensor Reference |
|---|---|
Use Scenario: Regulating auxiliary 9 V rail in satellite power distribution units exposed to thermal vacuum and particle radiation. IC Role / Device Role / Timing Role: Shunt Zener regulator providing stable voltage reference for DC-DC converter feedback and telemetry ADC biasing. Use Value: Maintains ±1.5% output stability over –65 °C to +125 °C ambient without external compensation, reducing BOM count and calibration overhead. |
Use Scenario: Precision voltage reference for gamma-ray spectrometer front-end amplifiers in nuclear reactor monitoring systems. IC Role / Device Role / Timing Role: Low-noise, radiation-immune Zener element establishing bias point for charge-sensitive preamplifiers. Use Value: Delivers <2.0 Ω dynamic impedance and <25 μA leakage at 6.9 V - minimizing baseline shift and energy resolution degradation under irradiation. |
| Downhole Drilling Instrumentation | Military Vehicle Power Conditioning |
Use Scenario: Voltage clamping and regulation in high-temperature logging tools operating at 175 °C borehole environments. IC Role / Device Role / Timing Role: Primary overvoltage protector and reference source for microcontroller reset circuitry and sensor excitation drivers. Use Value: Sustains full 5 W dissipation capability at 140 °C end-cap temperature - enabling direct mounting on ceramic substrates without heatsinks. |
Use Scenario: Stabilizing 9 V control rail in armored vehicle engine control units subject to wide ambient swings and EMI. IC Role / Device Role / Timing Role: MIL-qualified shunt regulator ensuring consistent logic-level thresholds for CAN transceivers and watchdog timers. Use Value: Withstands 20 A surge current (8.3 ms) and exhibits no parametric shift after MIL-STD-810G vibration testing - guaranteeing field reliability. |
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 | No "D" suffix → ±5% tolerance (vs. ±2% for JANTXV1N4957DUS/TR); identical package, thermal specs, and rating. | Suitable where tighter voltage tolerance is not required; lower cost for non-critical reference paths. | Select JANTXV1N4957US if system-level calibration compensates for initial tolerance; retain JANTXV1N4957DUS/TR for uncalibrated precision rails. |
| 1N4957US | Commercial-grade (non-JANTXV); same electrical specs but no MIL-PRF-19500/356 qualification or radiation hardness documentation. | Acceptable for industrial prototypes or non-safety-critical subsystems with relaxed reliability requirements. | Use 1N4957US only in development or non-flight hardware; JANTXV1N4957DUS/TR remains mandatory for flight, defense, or nuclear-certified designs. |
Compared with JANTXV1N4957US and 1N4957US, the JANTXV1N4957DUS/TR uniquely combines ±2% initial tolerance, MIL-qualified hermeticity, and documented radiation hardness - making it the sole choice for uncalibrated, high-temperature, mission-critical voltage references.
Availability
JANTXV1N4957DUS/TR is available at Aetrix Electronics and suitable for aerospace power bus regulation, radiation-hardened sensor reference, and downhole drilling instrumentation requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTXV1N4957DUS/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, radiation-tolerant, and military-qualified analog and mixed-signal components.
The JANTXV1N4957DUS/TR belongs to Microsemi's legacy 1N49xxUS series of hermetic Zener regulators, designed specifically for high-integrity voltage reference and overvoltage protection in aerospace, defense, and nuclear instrumentation systems.
FAQ
What is the Zener voltage tolerance of JANTXV1N4957DUS/TR?
The "D" suffix in JANTXV1N4957DUS/TR specifies a ±2% Zener voltage tolerance at 25 °C. This is tighter than the standard ±5% (no suffix) or ±1% (C suffix) options in the same family. The 9.1 V nominal value therefore falls within 8.92–9.28 V under test conditions, supporting precision regulation without post-manufacture trimming.
Is JANTXV1N4957DUS/TR qualified to MIL-PRF-19500/356?
Yes, JANTXV1N4957DUS/TR is explicitly qualified to MIL-PRF-19500/356 as a JANTXV-grade device. This includes screening for temperature cycling, burn-in, and parameter verification per the specification - confirming suitability for high-reliability applications where failure is not tolerable.
What is the maximum continuous Zener current for JANTXV1N4957DUS/TR?
The maximum continuous Zener current (IZM) for JANTXV1N4957DUS/TR is 520 mA, calculated from its 5 W power rating and 9.1 V Zener voltage (P = V × I). This value assumes operation at TEC = 140 °C; derating applies linearly above that temperature to zero at 175 °C.
Does JANTXV1N4957DUS/TR have radiation hardness documentation?
Yes, JANTXV1N4957DUS/TR inherits inherent radiation hardness from its voidless-glass hermetic construction and Category I metallurgical bond. Microsemi MicroNote 050 documents its tolerance to total ionizing dose (TID), making it suitable for low-earth orbit and nuclear instrumentation without additional shielding or qualification testing.
What package type does JANTXV1N4957DUS/TR use?
JANTXV1N4957DUS/TR uses the "E" package (also designated D-5B), a surface-mount hermetic glass case with tungsten slugs and copper end caps finished in Sn/Pb. It is EIA-481-B tape-and-reel compatible and features a cathode band for polarity identification.
JANTXV1N4957DUS/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:
- ±1%
- 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
JANTXV1N4957DUS/TR FAQ
1.How can I place an order for JANTXV1N4957DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTXV1N4957DUS/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 JANTXV1N4957DUS/TR reliable?
The price and inventory of JANTXV1N4957DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTXV1N4957DUS/TR is usually 5 days.
3.What payment methods are accepted for JANTXV1N4957DUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTXV1N4957DUS/TR transactions.
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4.How is shipping managed for JANTXV1N4957DUS/TR?
JANTXV1N4957DUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTXV1N4957DUS/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 JANTXV1N4957DUS/TR?
For technical support, including JANTXV1N4957DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTXV1N4957DUS/TR requirements.
6.How does Aetrix verify that JANTXV1N4957DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTXV1N4957DUS/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 JANTXV1N4957DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTXV1N4957DUS/TR?
All JANTXV1N4957DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTXV1N4957DUS/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 JANTXV1N4957DUS/TR part is unused and in its original packaging.
Return procedure for JANTXV1N4957DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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