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Microchip Technology JANS1N4977CUS/TR
- Part No.:
- JANS1N4977CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANS1N4977CUS/TR.pdf
- Description:
- DIODE ZENER 62V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:8,708
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Product details
Overview
JANS1N4977CUS/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 62 V ±2% (C-suffix), 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 or overvoltage clamp in high-reliability aerospace power conditioning circuits.
For engineers reviewing the JANS1N4977CUS/TR datasheet, JANS1N4977CUS/TR pinout, JANS1N4977CUS/TR application, or JANS1N4977CUS/TR equivalent, key selection criteria include its MIL-PRF-19500/356 qualification, voidless-glass hermetic seal, Category I metallurgical bond, radiation-hardened construction, and −65 °C to +175 °C operational envelope.
Technical Context
This device belongs to the JANS-classified 1N4954US–1N4996US series, featuring a hard-glass, voidless hermetic package with tungsten slugs and copper end caps finished in Sn/Pb. Its Zener regulation is stable across wide current (10%–50% IZM) and temperature ranges, with voltage regulation ΔVZ ≤5.0 V under specified test conditions.
The diode exhibits low dynamic impedance (42 Ω @ 20 mA), tight tolerance (±2%), and negligible ESD sensitivity per MIL-STD-750 Method 1020. Its thermal resistance is 7 °C/W junction-to-end-cap, enabling reliable 5 W operation when mounted on thermally adequate PCB land patterns per D-5B ("E") outline.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 62 V ±2% at IZT = 20 mA - ensures precise clamping or reference within 1.24 V tolerance at nominal bias |
| Power Dissipation | 5 W @ TEC = 140 °C - supports continuous regulation in high-temperature avionics environments |
| Dynamic Impedance ZZ | 42 Ω @ IZT = 20 mA - minimizes output voltage variation under load transients |
| Max Reverse Leakage IR | 2 μA @ VR = 47.1 V - guarantees low standby power loss in high-impedance bias networks |
| Junction Temperature Range | −65 °C to +175 °C - enables deployment in extreme-environment satellite power systems |
| Thermal Resistance θJC | 7 °C/W junction-to-end-cap - requires minimal external heatsinking when soldered to copper pads |
| Surge Current IZSM | 2.5 A @ 8.3 ms - withstands transient overvoltage events without degradation |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), with copper end caps, Sn/Pb finish, cathode indicated by band, and polarity-aligned for surface-mount reflow. Weight: 539 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 62 V reference or clamping point; marked with band |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and internal corrosion, ensuring >20-year reliability in vacuum or humid space environments |
| Category I metallurgical bond | Guarantees mechanical integrity and thermal cycling survivability per MIL-PRF-19500/356 Class JANS |
| Triple-layer passivation | Suppresses surface leakage and enhances long-term parameter stability under ionizing radiation |
| Nonsensitive to ESD | Withstands human-body-model discharges ≥8 kV without parameter shift or failure |
| Radiation hardness | Qualified per MicroNote 050 for total ionizing dose (TID) up to 100 krad(Si) with no functional degradation |
Applications
| Avionics Power Bus Protection | Satellite Voltage Reference |
|---|---|
|
Use Scenario: Clamping transient spikes on 28 V DC distribution buses in fighter aircraft flight control systems. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector downstream of DC-DC converters. Use Value: Withstands 2.5 A surge current for 8.3 ms while holding bus voltage ≤62 V, preventing damage to FPGAs and ADCs. |
Use Scenario: Providing stable 62 V reference for high-voltage telemetry sensor biasing in LEO satellite payloads. IC Role / Device Role / Timing Role: Precision Zener reference source for analog front-end calibration circuits. Use Value: ±2% tolerance and <7 °C/W thermal resistance ensure reference drift <0.01%/°C over −65 °C to +125 °C operational range. |
| Military Radar Power Supply | Spacecraft Battery Management |
|
Use Scenario: Regulating auxiliary supply rails in GaN-based radar transmitter modules exposed to thermal shock. IC Role / Device Role / Timing Role: Primary voltage regulator for gate-drive bias supplies in pulsed RF amplifiers. Use Value: Voidless-glass construction and −65 °C to +175 °C rating prevent parametric shift during rapid thermal cycling between pulse bursts. |
Use Scenario: Overvoltage protection for Li-ion battery stack monitoring ICs in deep-space probe power systems. IC Role / Device Role / Timing Role: Fail-safe clamp limiting sensed voltage to 62 V during cell imbalance events. Use Value: Radiation hardness and 2 μA leakage at 47.1 V ensure no false triggering or self-discharge in multi-year missions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4977CUS/TR | Same electrical specs but qualified to JANTXV level (lower screening rigor than JANS); 100% burn-in omitted | Suitable for non-critical subsystems where full JANS radiation testing not mandated | Select JANTXV1N4977CUS/TR only if mission assurance requirements permit reduced screening depth |
| 1N4977CUS/TR | Commercial-grade version; lacks MIL-PRF-19500/356 qualification, radiation data, and extended temperature validation | Restricted to ground-based industrial equipment with ambient temperature <85 °C and no radiation exposure | Choose 1N4977CUS/TR only for cost-sensitive terrestrial designs with no reliability or environmental certification needs |
Compared with JANS1N4977CUS/TR, JANTXV1N4977CUS/TR reduces procurement cost and lead time while retaining identical Zener voltage and thermal performance, whereas 1N4977CUS/TR omits military screening and radiation characterization entirely-making it unsuitable for flight hardware.
Availability
JANS1N4977CUS/TR is available at Aetrix Electronics and suitable for avionics power protection, satellite voltage reference, and military radar supply regulation requiring stable component supply across extended temperature and radiation environments.
Supply support for JANS1N4977CUS/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 analog and mixed-signal components for aerospace, defense, and industrial markets.
The JANS1N4977CUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356-qualified Zener diode family, engineered for fail-operational voltage regulation in mission-critical systems where parameter stability under extreme thermal, mechanical, and radiation stress is mandatory.
FAQ
What is the Zener voltage tolerance for JANS1N4977CUS/TR?
JANS1N4977CUS/TR has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in the part number. This means its nominal 62 V Zener voltage is guaranteed between 60.76 V and 63.24 V at 20 mA test current and 25 °C, supporting precision regulation in high-assurance systems.
Does JANS1N4977CUS/TR require derating above 140 °C end-cap temperature?
Yes, JANS1N4977CUS/TR must be linearly derated above 140 °C end-cap temperature, reaching zero power dissipation at 175 °C. Its thermal resistance is 7 °C/W junction-to-end-cap, so maintaining TEC ≤140 °C is essential to sustain full 5 W operation in sustained high-temperature environments.
Is JANS1N4977CUS/TR compatible with lead-free reflow processes?
No, JANS1N4977CUS/TR features Sn/Pb-finished copper end caps and is not qualified for lead-free reflow. Its maximum peak reflow temperature is limited to 235 °C per MIL-STD-202 Method 210, and lead-free profiles exceeding this may compromise hermeticity or metallurgical bond integrity.
What does the "JANS" prefix indicate for JANS1N4977CUS/TR?
The "JANS" prefix certifies that JANS1N4977CUS/TR meets the highest level of MIL-PRF-19500/356 screening, including 100% burn-in, radiation hardness assurance, and extended environmental testing. It signifies full qualification for use in spaceflight and nuclear-hardened military platforms.
Can JANS1N4977CUS/TR be used as a forward-biased rectifier?
JANS1N4977CUS/TR is optimized for reverse-bias Zener operation; its forward voltage is specified as 1.50 V at 1.0 A, but it lacks forward surge rating or repetitive switching characterization. Using it as a rectifier is not recommended-dedicated power diodes should be selected instead.
JANS1N4977CUS/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
JANS1N4977CUS/TR FAQ
1.How can I place an order for JANS1N4977CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4977CUS/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 JANS1N4977CUS/TR reliable?
The price and inventory of JANS1N4977CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4977CUS/TR is usually 5 days.
3.What payment methods are accepted for JANS1N4977CUS/TR?
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JANS1N4977CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANS1N4977CUS/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 JANS1N4977CUS/TR?
For technical support, including JANS1N4977CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4977CUS/TR requirements.
6.How does Aetrix verify that JANS1N4977CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANS1N4977CUS/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 JANS1N4977CUS/TR meets industry standards.
7.What is the process for return or replacement of JANS1N4977CUS/TR?
All JANS1N4977CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4977CUS/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 JANS1N4977CUS/TR part is unused and in its original packaging.
Return procedure for JANS1N4977CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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