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Microchip Technology JANTX1N4957DUS/TR
- Part No.:
- JANTX1N4957DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4957DUS/TR.pdf
- Description:
- DIODE ZENER 9.1V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:9,136
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Product details
Overview
JANTX1N4957DUS/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 9.1 V ±5%, dynamic impedance of 2.0 Ω at 150 mA test current, and operating junction temperature range of –65 °C to +175 °C. It serves as a precision voltage reference and regulation element in high-reliability power supply rails and analog signal conditioning circuits.
For engineers reviewing the JANTX1N4957DUS/TR datasheet, JANTX1N4957DUS/TR pinout, JANTX1N4957DUS/TR application, or JANTX1N4957DUS/TR equivalent, this part is selected for aerospace power sequencing, radiation-tolerant sensor biasing, and MIL-PRF-19500/356-compliant voltage clamping where voidless-glass construction and Category I metallurgical bonding are mandatory.
Technical Context
This device belongs to the 1N4954US–1N4996US family of voidless-glass, hermetically sealed Zener regulators qualified to MIL-PRF-19500/356 under JAN/JANTX level. It employs an internal tungsten slug and copper end caps with Sn/Pb finish, enabling stable operation across extreme thermal cycling and high-vacuum environments.
Its electrical behavior is defined by tight regulation over 10–50% of IZM (ΔVZ ≤ 0.7 V), low reverse leakage (25 μA at 6.9 V), and robust surge capability (22 A @ 8.3 ms). The "D" suffix confirms ±2% Zener voltage tolerance, tighter than standard ±5% parts in the series.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±2% at 150 mA - enables precise 9 V rail regulation with minimal drift under load variation |
| Power Dissipation | 5 W @ TEC = 140 °C - supports high-stability operation without derating until 140 °C end-cap temperature |
| Dynamic Impedance (ZZ) | 2.0 Ω @ IZT = 150 mA - ensures low output impedance for effective ripple suppression in reference paths |
| Max Reverse Leakage (IR) | 25 μA @ VR = 6.9 V - guarantees minimal parasitic current draw in high-impedance bias networks |
| Operating Temperature | –65 °C to +175 °C - validated for use in space-grade thermal vacuum chambers and engine bay electronics |
| Thermal Resistance (RθJC) | 7 °C/W junction-to-end-cap - allows accurate thermal modeling when mounted on copper heatsink pads |
| Surge Current (IZSM) | 22 A @ 8.3 ms half-sine - withstands transient overvoltage events per MIL-STD-1275 without degradation |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), surface-mount, cathode-banded, with copper end caps and Sn/Pb finish. Weight: 539 mg. Tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; carries full regulator current during breakdown |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher-potential node; defines regulated output voltage referenced to anode |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture and gas migration, ensuring zero parametric shift over 20+ years in space vacuum |
| Category I metallurgical bond | Guarantees mechanical integrity under 20,000 g shock and 50 g vibration per MIL-STD-883 Method 2007 |
| Triple-layer passivation | Prevents surface leakage and contamination-induced breakdown instability in high-humidity or salt-fog environments |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 without parameter shift or catastrophic failure |
| Inherent radiation hardness | Qualified to 100 krad(Si) TID with <10% VZ shift, per Microsemi MicroNote 050 for space applications |
Applications
| Aerospace Power Sequencing | Avionics Sensor Biasing |
|---|---|
Use Scenario: Controlling startup order of flight control subsystems using discrete logic triggered by regulated voltage thresholds. IC Role / Device Role / Timing Role: Zener reference element defining precise enable thresholds for power management ICs and comparators. Use Value: ±2% tolerance and –65 °C to +175 °C stability ensure deterministic sequencing across all mission phases without recalibration. |
Use Scenario: Providing stable excitation voltage to piezoresistive pressure transducers in engine monitoring systems. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference source for bridge excitation in analog front-ends. Use Value: 2.0 Ω dynamic impedance and <25 μA leakage minimize measurement error and offset drift over temperature extremes. |
| Military Radio RF Stage Protection | Satellite Payload Voltage Clamping |
Use Scenario: Clamping transient voltages induced on RF amplifier bias lines during EMP or lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing 22 A surge pulses without latch-up or parameter shift. Use Value: 8.3 ms surge rating and hermetic voidless construction prevent latent failure modes common in plastic-packaged Zeners. |
Use Scenario: Limiting bus voltage excursions in LEO satellite power distribution units exposed to single-event effects. IC Role / Device Role / Timing Role: Radiation-hardened clamp diode maintaining safe voltage margins during SEE-induced transients. Use Value: Inherent TID hardness and 100 krad(Si) qualification eliminate need for shielding or redundancy overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4957DUS/TR | Higher screening level (JANTXV vs JANTX); includes additional burn-in and lot acceptance testing per MIL-PRF-19500/356 | Required for Class S (spaceflight) and critical flight hardware where extended reliability validation is mandated | Select JANTXV version when full MIL-PRF-19500/356 Class V screening is specified in the design assurance plan |
| 1N4957US | Commercial-grade variant; no MIL-qualified screening, no radiation hardness data, ±5% tolerance (no "D" suffix) | Suitable only for non-mission-critical ground-test equipment or lab prototypes without environmental or lifetime requirements | Use 1N4957US only for cost-sensitive development boards where military qualification is not required |
Compared with JANTX1N4957DUS/TR, JANTXV1N4957DUS/TR adds burn-in and extended life testing for space-grade assurance, while 1N4957US omits all military screening and tolerances-making it unsuitable for deployed systems requiring MIL-PRF-19500 compliance.
Availability
JANTX1N4957DUS/TR is available at Aetrix Electronics and suitable for aerospace power sequencing, avionics sensor biasing, and military radio RF stage protection requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for JANTX1N4957DUS/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 manufacturer specializing in high-reliability, radiation-hardened, and defense-qualified components.
The JANTX1N4957DUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 Zener regulator product line, engineered specifically for aerospace, defense, and nuclear instrumentation applications demanding hermetic sealing and extreme environmental resilience.
FAQ
What does the "D" suffix mean in JANTX1N4957DUS/TR?
The "D" suffix in JANTX1N4957DUS/TR indicates ±2% Zener voltage tolerance at 25 °C, verified per MIL-PRF-19500/356 test methods. This is tighter than the standard ±5% tolerance denoted by no suffix or "C" (±1%). JANTX1N4957DUS/TR achieves this via post-trim screening and binning, ensuring predictable regulation in precision analog circuits.
Is JANTX1N4957DUS/TR compatible with lead-free solder reflow profiles?
JANTX1N4957DUS/TR features Sn/Pb finish on copper end caps and is qualified for traditional eutectic solder processes. While it can survive peak temperatures up to 235 °C, Microsemi documentation does not validate compatibility with Pb-free reflow profiles (e.g., JEDEC J-STD-020). For Pb-free assembly, JANTX1N4957DUS/TR requires process validation per MIL-STD-202 Method 210.
Does JANTX1N4957DUS/TR require derating above 140 °C?
Yes. JANTX1N4957DUS/TR is rated for 5 W only at end-cap temperature (TEC) = 140 °C. Above that, power must be linearly derated to zero at 175 °C, yielding a derating slope of 35.7 mW/°C. This reflects its 7 °C/W thermal resistance and ensures junction temperature remains within –65 °C to +175 °C limits under sustained load.
How is the cathode identified on JANTX1N4957DUS/TR?
The cathode of JANTX1N4957DUS/TR is marked by a visible band on the glass body, consistent with industry-standard polarity marking for axial and surface-mount Zeners. This band aligns with the cathode terminal in the D-5B ("E") package outline and must be oriented toward the higher-potential node in reverse-bias regulation configurations.
Can JANTX1N4957DUS/TR replace 1N4957US in existing designs?
JANTX1N4957DUS/TR is a direct functional and mechanical replacement for 1N4957US, sharing identical D-5B package dimensions, pinout, and nominal 9.1 V rating. However, JANTX1N4957DUS/TR adds MIL-PRF-19500/356 qualification, ±2% tolerance, and radiation hardness-making it suitable for deployment where 1N4957US is limited to prototyping.
JANTX1N4957DUS/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
JANTX1N4957DUS/TR FAQ
1.How can I place an order for JANTX1N4957DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4957DUS/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 JANTX1N4957DUS/TR reliable?
The price and inventory of JANTX1N4957DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4957DUS/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4957DUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4957DUS/TR transactions.
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4.How is shipping managed for JANTX1N4957DUS/TR?
JANTX1N4957DUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4957DUS/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 JANTX1N4957DUS/TR?
For technical support, including JANTX1N4957DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4957DUS/TR requirements.
6.How does Aetrix verify that JANTX1N4957DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4957DUS/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 JANTX1N4957DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4957DUS/TR?
All JANTX1N4957DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4957DUS/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 JANTX1N4957DUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4957DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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