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Microchip Technology JANTX1N4955CUS/TR
- Part No.:
- JANTX1N4955CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4955CUS/TR.pdf
- Description:
- DIODE ZENER 7.5V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:4,052
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Product details
Overview
JANTX1N4955US/TR from Microsemi is a military-qualified, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with nominal Zener voltage of 6.2 V ±5%, dynamic impedance of 1.0 Ω at 220 mA test current, and operating junction temperature range from –65 °C to +175 °C. It serves as a precision voltage reference and overvoltage clamp in high-reliability aerospace power conditioning circuits.
For engineers reviewing the JANTX1N4955US/TR datasheet, JANTX1N4955US/TR pinout, JANTX1N4955US/TR application, or JANTX1N4955US/TR equivalent, this part is selected for mission-critical voltage regulation where radiation hardness, ESD immunity (MIL-STD-750 Method 1020), and long-term parametric stability under thermal cycling are mandatory design requirements.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage regulation across 10–50% of IZM (765 mA), exhibiting ΔVZ ≤ 0.04 V over that range. Its voidless glass package incorporates Category I metallurgical bonds and triple-layer passivation to ensure hermeticity and reliability in harsh environments.
The JANTX1N4955US/TR delivers stable regulation despite wide variations in input current (IZ = 100 μA to 765 mA) and ambient temperature (–65 °C to +175 °C), supported by low thermal resistance (7 °C/W junction-to-end-cap) and negligible temperature coefficient (±0.04 %/°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 6.2 V ±5% at 220 mA - defines regulated output level with tight tolerance for reference accuracy |
| Power Dissipation | 5 W @ TEC = 140 °C - enables high-energy transient clamping without derating below 140 °C |
| Dynamic Impedance ZZT | 1.0 Ω @ IZT = 220 mA - ensures minimal output voltage variation under load transients |
| Max Reverse Leakage IR | 1000 μA @ VR = 4.74 V - guarantees low quiescent current in standby regulation modes |
| Temp Coefficient αVZ | ±0.04 %/°C @ IZT - supports stable reference performance across full military temperature range |
| Surge Current IZSM | 18.7 A @ 8.3 ms - withstands short-duration overvoltage events per MIL-STD-1275 |
| Junction Temp Range | –65 °C to +175 °C - qualified for operation in jet engine bays and space-grade electronics |
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 | Forward conduction terminal | Connected to lower-potential rail during normal forward bias; used for polarity verification |
| Cathode | Zener breakdown terminal | Connected to regulated output node; marked by band; carries full Zener current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass construction | Eliminates internal moisture ingress and outgassing-critical for vacuum and high-humidity deployments |
| Category I metallurgical bond | Guarantees mechanical integrity and thermal cycle survivability exceeding 1000 cycles between –65 °C and +175 °C |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling and assembly without special grounding protocols or ionized air systems |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050-no upscreening required for TID up to 100 krad(Si) |
| Triple-layer passivation | Prevents surface leakage paths and corrosion-induced parameter drift in salt fog or atomic oxygen environments |
Applications
| Aerospace Power Bus Protection | Avionics Reference Voltage Source |
|---|---|
Use Scenario: Clamping transient spikes on 28 V DC aircraft power buses during load dump or lightning-induced surges. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and crowbar element in primary bus protection circuitry. Use Value: Withstands 18.7 A surge for 8.3 ms and maintains 6.2 V regulation within ±0.04 V across –65 °C to +175 °C, ensuring bus stability during flight-critical events. |
Use Scenario: Providing stable 6.2 V reference for analog-to-digital converters in inertial measurement units (IMUs). IC Role / Device Role / Timing Role: Precision voltage reference element in ratiometric sensor signal chains. Use Value: ±0.04 %/°C tempco and <1.0 Ω dynamic impedance enable sub-0.1% reference error over full operational temperature range without external trimming. |
| Satellite Power Conditioning | Military Radio RF Stage Bias |
Use Scenario: Regulating bias voltage for GaAs FET drivers in L-band satellite transponders exposed to total ionizing dose. IC Role / Device Role / Timing Role: Radiation-hardened Zener reference in DC-DC converter feedback loops. Use Value: Inherent radiation hardness (MicroNote 050) eliminates need for shielding or redundancy, reducing SWaP-C in payload electronics. |
Use Scenario: Establishing stable gate bias for Class AB RF power amplifiers in handheld tactical radios. IC Role / Device Role / Timing Role: Zener-based bias network for temperature-compensated amplifier stages. Use Value: Low 7 °C/W thermal resistance and stable 6.2 V output maintain amplifier linearity across –40 °C to +85 °C ambient, meeting MIL-STD-810G environmental specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4955US/TR | Higher screening level (JANTXV per MIL-PRF-19500/356); tighter 1% VZ tolerance available with 'D' suffix | Required for programs demanding extended burn-in, lot acceptance testing, and enhanced radiation assurance | Select when program spec mandates JANTXV-level qualification or sub-1% voltage tolerance |
| 1N4955US (commercial grade) | No military screening; same electrical specs but not tested to MIL-PRF-19500/356; no radiation hardness documentation | Suitable only for non-mission-critical industrial or test equipment where cost sensitivity outweighs reliability requirements | Select only for ground-based lab instrumentation or prototyping where MIL-spec is not contractually required |
Compared with JANTX1N4955US/TR, JANTXV1N4955US/TR adds verified radiation tolerance and tighter screening for flight hardware, while 1N4955US omits all military qualification-making the JANTX variant the optimal balance of assured reliability and procurement availability for defense avionics.
Availability
JANTX1N4955US/TR is available at Aetrix Electronics and suitable for aerospace power bus protection, avionics reference voltage sources, satellite power conditioning, and military radio RF stage bias requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4955US/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 JANTX1N4955US/TR belongs to Microsemi's legacy MIL-PRF-19500/356-qualified Zener diode family, engineered specifically for voltage regulation in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance for JANTX1N4955US/TR?
The JANTX1N4955US/TR has a nominal Zener voltage of 6.2 V with a standard tolerance of ±5%, as specified in the Microsemi SD44A datasheet. This tolerance applies to the JANTX grade; tighter tolerances (e.g., ±1%) require the JANTXV grade with appropriate suffix coding. The ±5% ensures predictable regulation in high-reliability power control circuits without requiring post-manufacture calibration.
Is JANTX1N4955US/TR suitable for space applications?
Yes, JANTX1N4955US/TR is inherently radiation-hardened per Microsemi MicroNote 050 and qualified to MIL-PRF-19500/356, making it suitable for low-earth orbit (LEO) satellite power subsystems. Its voidless glass package, Category I metallurgical bond, and operation up to +175 °C support deployment in unpressurized, high-radiation environments without additional shielding or derating.
What is the maximum continuous Zener current for JANTX1N4955US/TR?
The maximum continuous Zener current (IZM) for JANTX1N4955US/TR is 765 mA at 25 °C, derating linearly above 140 °C end-cap temperature to zero at 175 °C. This value is derived from its 5 W power rating and 6.2 V nominal Zener voltage, enabling robust regulation in high-current reference and clamping roles.
Does JANTX1N4955US/TR have ESD protection built-in?
JANTX1N4955US/TR is nonsensitive to ESD per MIL-STD-750 Method 1020, meaning it does not require external ESD protection during handling or PCB assembly. This intrinsic immunity stems from its hermetically sealed voidless glass construction and metallurgical bonding, eliminating the need for ionized air workstations or wrist straps in production.
What package type is used for JANTX1N4955US/TR?
JANTX1N4955US/TR uses the "E" package (also known as D-5B), a surface-mount hermetically sealed voidless glass case with copper end caps finished in Sn/Pb. It features cathode identification via a band, weighs 539 mg, and is supplied in EIA-481-B compliant tape-and-reel format for automated placement.
JANTX1N4955CUS/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):
- 7.5 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 1.5 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 5.7 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
JANTX1N4955CUS/TR FAQ
1.How can I place an order for JANTX1N4955CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4955CUS/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 JANTX1N4955CUS/TR reliable?
The price and inventory of JANTX1N4955CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4955CUS/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4955CUS/TR?
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JANTX1N4955CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4955CUS/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 JANTX1N4955CUS/TR?
For technical support, including JANTX1N4955CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4955CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4955CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4955CUS/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 JANTX1N4955CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4955CUS/TR?
All JANTX1N4955CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4955CUS/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 JANTX1N4955CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4955CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JANTX1N4955CUS/TR Tags
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