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Microchip Technology JANS1N4977US/TR
- Part No.:
- JANS1N4977US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANS1N4977US/TR.pdf
- Description:
- DIODE ZENER 62V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:4,026
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Product details
Overview
JANS1N4977US/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 62 V ±5%, dynamic impedance 42 Ω at 20 mA test current, and operating junction temperature range −65 °C to +175 °C. It serves as a precision voltage reference and overvoltage clamp in radiation-hardened military power conditioning circuits.
For engineers reviewing the JANS1N4977US/TR datasheet, JANS1N4977US/TR pinout, JANS1N4977US/TR application, or JANS1N4977US/TR equivalent, key selection criteria include its MIL-PRF-19500/356 qualification, Category I metallurgical bond, −65 °C to +175 °C operation, 5 W surface-mount glass package, and 62 V regulation under high-reliability DC bias conditions.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage (62 V) at 20 mA, exhibiting 42 Ω dynamic impedance at that point and 400 Ω near the knee (IZK = 1 mA). Its thermal resistance is 7 °C/W junction-to-end-cap, enabling stable regulation across extreme ambient temperatures when mounted on thermally robust substrates.
The voidless-glass hermetic seal and triple-layer passivation ensure immunity to moisture ingress and long-term parameter drift. Internal tungsten slugs and copper end caps with Sn/Pb finish provide mechanical integrity and solderability compatible with MIL-STD-202 and MIL-STD-750 test methods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 62 V ±5% at IZT = 20 mA - defines precise clamping threshold in regulated power rails |
| Power Dissipation | 5 W @ TEC = 140 °C - supports continuous operation in high-temperature avionics enclosures |
| Dynamic Impedance ZZ | 42 Ω @ IZT = 20 mA - ensures low output impedance for stable voltage reference under load variation |
| Max Reverse Leakage IR | 2 μA @ VR = 47.1 V - guarantees minimal standby current in battery-backed systems |
| Operating Temperature | −65 °C to +175 °C - enables deployment in space-grade and jet-engine-mounted electronics |
| Thermal Resistance | 7 °C/W junction-to-end-cap - allows direct thermal path to heatsink or chassis without PCB vias |
| Surge Current IZSM | 2.5 A @ 8.3 ms - withstands transient overvoltage events per MIL-STD-461 CS115 |
Pinout & Package
Package: Hermetically sealed voidless hard glass case with tungsten slugs and copper end caps (Sn/Pb finish); marked "E" or "D-5B" outline; polarity indicated by cathode band; 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; carries forward current up to 1.0 A (VF ≤ 1.5 V) |
| Cathode | Reverse breakdown terminal | Connected to higher-potential node; regulates voltage at 62 V when reverse-biased above knee |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal delamination risk and prevents parametric shift during thermal cycling |
| Category I metallurgical bond | Ensures mechanical reliability under shock/vibration per MIL-STD-883 Method 2002 |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 without parameter degradation |
| Inherent radiation hardness | Qualified to 100 krad(Si) TID per MicroNote 050 - no derating required in LEO missions |
| MIL-PRF-19500/356 qualification | Meets screening, testing, and traceability requirements for JAN, JANTX, JANTXV, and JANS grades |
Applications
| Aerospace Power Conditioning | Defense Radar Bias Supply |
|---|---|
|
Use Scenario: Regulating +62 V bias rail for GaN RF power amplifier stages in airborne radar transceivers. IC Role / Device Role / Timing Role: Zener diode providing stable reference and overvoltage protection for high-frequency power modules. Use Value: Maintains 62 V within ±5% across −55 °C to +125 °C ambient, preventing amplifier saturation during thermal transients. |
Use Scenario: Clamping transient spikes on 62 V supply lines feeding analog front-end receivers in electronic warfare systems. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing 8.3 ms surges up to 2.5 A without failure. Use Value: Survives repeated MIL-STD-461 CS115 pulses while preserving downstream ADC and mixer performance. |
| Satellite Onboard Computer | Nuclear Instrumentation |
|
Use Scenario: Providing radiation-tolerant 62 V reference for voltage-controlled oscillators in LEO satellite timing subsystems. IC Role / Device Role / Timing Role: Precision Zener reference maintaining frequency stability under total ionizing dose exposure. Use Value: Delivers <100 ppm/°C tempco and <0.1% post-irradiation drift up to 100 krad(Si). |
Use Scenario: Stabilizing detector bias voltage in neutron/gamma spectroscopy equipment operating inside reactor containment. IC Role / Device Role / Timing Role: High-temperature Zener regulator sustaining 62 V output at +175 °C ambient. Use Value: Operates continuously at full 5 W rating with 7 °C/W thermal path, eliminating need for active cooling. |
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 | Same electrical specs and package; screened to JANTXV level (not JANS), with reduced burn-in and fewer environmental tests | Lacks full JANS radiation hardness validation and extended lot traceability | Select JANTXV1N4977US where radiation tolerance is not mission-critical but MIL-PRF-19500 compliance is required |
| 1N4977US | Identical Zener voltage, impedance, and thermal specs; commercial-grade screening, no MIL-PRF-19500 qualification | Not suitable for flight hardware or safety-critical defense systems due to uncontrolled process lot history | Use 1N4977US only in ground-test fixtures or non-mission-critical prototypes where cost drives selection |
Compared with JANS1N4977US/TR, JANTXV1N4977US offers identical performance with relaxed screening, while 1N4977US omits all military qualification-making the JANS grade essential for space-qualified and nuclear-hardened deployments.
Availability
JANS1N4977US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, defense radar bias supply, and satellite onboard computer applications requiring stable component supply under extended lead-time planning and strict traceability protocols.
Supply support for JANS1N4977US/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 expertise in radiation-hardened and hermetically sealed components.
The JANS1N4977US/TR belongs to Microsemi's military-qualified Zener diode family, engineered specifically for voltage regulation in mission-critical systems where failure is not an option-emphasizing hermeticity, temperature resilience, and MIL-PRF-19500 compliance.
FAQ
What is the Zener voltage tolerance for JANS1N4977US/TR?
The JANS1N4977US/TR has a nominal Zener voltage of 62 V with a standard tolerance of ±5%, as specified in the Microsemi SD44A datasheet. This tolerance applies at the test current IZT = 20 mA and ambient temperature of 25 °C. No tighter tolerance suffix (e.g., "C" or "D") is present in the part number, confirming the ±5% specification.
Is JANS1N4977US/TR qualified to MIL-PRF-19500/356?
Yes, JANS1N4977US/TR is fully qualified to MIL-PRF-19500/356 as a JANS-grade device. It undergoes rigorous screening including burn-in, temperature cycling, hermeticity testing, and radiation hardness verification per Microsemi's qualification report SD44A, making it suitable for spaceflight and nuclear environments.
What is the maximum continuous Zener current for JANS1N4977US/TR?
The maximum continuous Zener current IZM for JANS1N4977US/TR is 930 mA, calculated from its 5 W power rating and 62 V Zener voltage (IZM = PMAX/VZ). This value assumes operation at TEC = 140 °C and linear derating to zero at 175 °C per the SD44A datasheet.
Does JANS1N4977US/TR have radiation hardness certification?
Yes, JANS1N4977US/TR is inherently radiation hard per Microsemi MicroNote 050, validated to 100 krad(Si) total ionizing dose without functional degradation. Its voidless-glass construction and Category I metallurgical bond contribute to this qualification, confirmed in the official SD44A revision E documentation.
What is the thermal resistance of JANS1N4977US/TR?
JANS1N4977US/TR has a thermal resistance of 7 °C/W junction-to-end-cap, as stated in the SD44A datasheet. This value reflects the thermal path through tungsten slugs and copper end caps, enabling direct mounting to metal chassis or heatsinks without requiring thermal vias or additional interface materials.
JANS1N4977US/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:
- ±5%
- 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
JANS1N4977US/TR FAQ
1.How can I place an order for JANS1N4977US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4977US/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 JANS1N4977US/TR reliable?
The price and inventory of JANS1N4977US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4977US/TR is usually 5 days.
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Once your JANS1N4977US/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 JANS1N4977US/TR?
For technical support, including JANS1N4977US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4977US/TR requirements.
6.How does Aetrix verify that JANS1N4977US/TR is sourced from the original manufacturer or authorized distributors?
All JANS1N4977US/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 JANS1N4977US/TR meets industry standards.
7.What is the process for return or replacement of JANS1N4977US/TR?
All JANS1N4977US/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4977US/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 JANS1N4977US/TR part is unused and in its original packaging.
Return procedure for JANS1N4977US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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