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Microchip Technology JANTX1N4977CUS/TR
- Part No.:
- JANTX1N4977CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4977CUS/TR.pdf
- Description:
- DIODE ZENER 62V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:9,533
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Product details
Overview
JANTX1N4977US/TR from Microsemi is a hermetically sealed, voidless-glass surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with nominal Zener voltage of 62 V at 20 mA test current, ±5% tolerance, and dynamic impedance of 42 Ω at IZT. It serves as a precision voltage reference and regulation element in high-reliability military power conditioning circuits.
For engineers reviewing the JANTX1N4977US/TR datasheet, JANTX1N4977US/TR pinout, JANTX1N4977US/TR application, or JANTX1N4977US/TR equivalent, this part is selected for critical voltage clamping, overvoltage protection, and stable biasing in aerospace avionics, radiation-hardened instrumentation, and MIL-PRF-19500/356-compliant systems where long-term parametric stability and zero-failure tolerance are mandatory.
Technical Context
This device operates in reverse breakdown with a specified Zener voltage of 62 V at 20 mA, exhibiting 42 Ω dynamic impedance at that point and 400 Ω at 1 mA near the knee. Its thermal resistance is 7 °C/W junction-to-end-cap, enabling reliable 5 W operation up to 140 °C end-cap temperature before linear derating to zero at 175 °C.
The "E" (D-5B) package uses tungsten slugs and copper end caps with Sn/Pb finish, cathode indicated by band. It achieves inherent radiation hardness per MicroNote 050 and ESD immunity per MIL-STD-750 Method 1020, with triple-layer passivation and Category I metallurgical bonding per MIL-PRF-19500/356.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 62 V at IZT = 20 mA - defines precise regulation point under standard test conditions |
| Power Dissipation | 5 W @ TEC = 140 °C - maximum continuous steady-state power handling at rated end-cap temperature |
| Dynamic Impedance ZZT | 42 Ω @ IZT = 20 mA - low AC impedance ensures minimal output voltage variation under load transients |
| Max Reverse Leakage IR | 2 μA @ VR = 47.1 V - ultra-low leakage preserves regulation accuracy in high-impedance bias networks |
| Temp Coefficient αVZ | +0.100 %/°C @ IZT - predictable positive drift enables accurate thermal compensation in precision references |
| Surge Current IZSM | 2.5 A @ 8.3 ms - withstands short-duration overvoltage events without degradation |
| Operating Temperature | –65 °C to +175 °C - supports deployment in extreme environmental envelopes including space and engine bays |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), with tungsten slugs and copper end caps finished in Sn/Pb. Cathode identified by band. Weight: 539 mg. Tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage reference node | Connected to circuit ground or lowest potential point during Zener operation |
| Cathode | Reverse-biased Zener terminal / regulated output node | Provides stable 62 V reference when biased above breakdown; marked with band |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass construction | Eliminates internal delamination and moisture ingress, ensuring >20-year parametric stability in vacuum and humid environments |
| Category I metallurgical bond | Guarantees mechanical integrity and thermal cycling survivability per MIL-PRF-19500/356 Class JANTX |
| Triple-layer passivation | Prevents surface leakage and contamination-induced parameter shift under ionizing radiation exposure |
| Nonsensitive to ESD | Withstands ≥8 kV HBM without parameter shift-no external protection required in board-level assembly |
| Inherent radiation hardness | Qualified to 100 krad(Si) TID per MicroNote 050-enables use in LEO satellite power supervisors without shielding |
Applications
| Aerospace Power Bus Protection | Military Radar Bias Supply |
|---|---|
Use Scenario: Clamping transient spikes on 28 V DC aircraft bus during load dump or lightning-induced surges. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp voltage to safe levels. Use Value: Withstands 2.5 A surge for 8.3 ms and maintains 62 V regulation tolerance within ±5%, preventing downstream FET gate oxide failure. |
Use Scenario: Providing stable 62 V bias to GaN RF amplifier stages in airborne fire-control radar transceivers. IC Role / Device Role / Timing Role: Precision voltage reference and current-limiting element in high-stability bias network. Use Value: Low 42 Ω dynamic impedance and +0.100 %/°C tempco enable <±0.5% total error across –55 °C to +125 °C operational range. |
| Satellite Onboard Computer Reference | Nuclear Instrumentation Calibration |
Use Scenario: Generating primary 62 V reference for ADC/DAC calibration in radiation-tolerant onboard computers. IC Role / Device Role / Timing Role: Primary voltage reference source with long-term drift <100 ppm/year. Use Value: Inherent radiation hardness and hermetic sealing ensure calibration stability after 100 krad(Si) total ionizing dose exposure. |
Use Scenario: Stabilizing high-voltage supply rails in portable gamma spectrometers used in field nuclear detection. IC Role / Device Role / Timing Role: Regulation element in HV feedback loop controlling photomultiplier tube gain. Use Value: Ultra-low 2 μA leakage at 47.1 V prevents signal current corruption in picoampere-level detector circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4977US | Higher screening level: JANTXV per MIL-PRF-19500/356 adds burn-in, life test, and tighter lot acceptance testing | Required for Class V mission-critical subsystems (e.g., flight control actuation) | Select JANTXV1N4977US when full MIL-PRF-19500/356 Class V qualification and extended reliability data are mandated |
| 1N4977US | Commercial-grade version: no military screening, wider temp range (–65 °C to +175 °C retained but no lot traceability or radiation data) | Suitable for industrial test equipment or non-safety-critical avionics support systems | Select 1N4977US only for cost-sensitive, non-military programs where radiation hardness and lot-level reliability data are not required |
Compared with JANTX1N4977US/TR, JANTXV1N4977US delivers enhanced reliability assurance for flight-critical functions, while 1N4977US offers identical electrical specs at lower cost for non-mission-critical applications-neither is pin-compatible with axial-leaded equivalents due to D-5B surface-mount geometry.
Availability
JANTX1N4977US/TR is available at Aetrix Electronics and suitable for aerospace power bus protection, military radar bias supply, and satellite onboard computer reference requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4977US/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 emphasis on radiation-hardened and MIL-spec components.
The JANTX1N4977US/TR belongs to Microsemi's legacy 1N49xxUS series of hermetic Zener regulators, engineered specifically for fail-safe voltage reference and clamping in MIL-PRF-19500/356-compliant systems.
FAQ
What is the Zener voltage tolerance for JANTX1N4977US/TR?
JANTX1N4977US/TR has a nominal Zener voltage of 62 V with a standard tolerance of ±5%, as defined in MIL-PRF-19500/356. This tolerance applies at 20 mA test current and 25 °C ambient; no tighter tolerance suffix (e.g., "C" or "D") is present in the part number, confirming the ±5% specification for JANTX1N4977US/TR.
Does JANTX1N4977US/TR require external heat sinking?
No, JANTX1N4977US/TR does not require external heat sinking when operated within its 5 W rating at end-cap temperature ≤140 °C. Its 7 °C/W junction-to-end-cap thermal resistance allows direct PCB mounting with adequate copper pour; derating begins linearly above 140 °C and reaches zero dissipation at 175 °C.
Is JANTX1N4977US/TR compatible with lead-free reflow processes?
JANTX1N4977US/TR features Sn/Pb finish on copper end caps and is qualified for traditional tin-lead soldering. It is not rated for lead-free reflow (e.g., SAC305 peak >260 °C); Microsemi documentation specifies Sn/Pb compatibility only, and no lead-free qualification data exists for this specific JANTX variant.
What is the maximum continuous reverse current for JANTX1N4977US/TR?
The maximum continuous reverse (leakage) current for JANTX1N4977US/TR is 2 μA at VR = 47.1 V and 25 °C, as specified in the Electrical Characteristics table. This value remains stable across the full –65 °C to +175 °C operating range due to hermetic sealing and triple-layer passivation.
Can JANTX1N4977US/TR be used in place of axial-leaded 1N4977?
No, JANTX1N4977US/TR cannot be substituted for axial-leaded 1N4977 without PCB redesign. The "US" suffix denotes the surface-mount D-5B ("E") package, while 1N4977 is axial-leaded. Their footprints, thermal paths, and mounting methods are incompatible; the datasheet explicitly states axial versions require deletion of the "US" suffix and reference to a separate data sheet.
JANTX1N4977CUS/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):
- 62 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 42 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 47.1 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
JANTX1N4977CUS/TR FAQ
1.How can I place an order for JANTX1N4977CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4977CUS/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 JANTX1N4977CUS/TR reliable?
The price and inventory of JANTX1N4977CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4977CUS/TR is usually 5 days.
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5.How can I obtain technical support or documentation for JANTX1N4977CUS/TR?
For technical support, including JANTX1N4977CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4977CUS/TR requirements.
6.How does Aetrix verify that JANTX1N4977CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4977CUS/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 JANTX1N4977CUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4977CUS/TR?
All JANTX1N4977CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4977CUS/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 JANTX1N4977CUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4977CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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