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Microchip Technology JANTX1N4977DUS/TR
- Part No.:
- JANTX1N4977DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4977DUS/TR.pdf
- Description:
- DIODE ZENER 62V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
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Product details
Overview
JANTX1N4977DUS/TR from Microsemi is a military-grade, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation, with a nominal Zener voltage of 62 V at 20 mA test current, ±1% tolerance (D suffix), and operating junction temperature range of −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 JANTX1N4977DUS/TR datasheet, JANTX1N4977DUS/TR pinout, JANTX1N4977DUS/TR application, or JANTX1N4977DUS/TR equivalent, key selection criteria include its voidless-glass package, Category I metallurgical bond, radiation-hardened construction per MicroNote 050, and compliance with MIL-PRF-19500/356 Class JANTX.
Technical Context
This Zener operates in reverse breakdown with tightly controlled dynamic impedance (42 Ω at 20 mA) and low voltage regulation drift (ΔVZ ≤ 5.0 V between 10% and 50% of IZM). Its thermal resistance is 7 °C/W junction-to-end-cap, enabling stable regulation under sustained 5 W dissipation at end-cap temperature ≤140 °C.
The device features triple-layer passivation, nonsensitive ESD performance per MIL-STD-750 Method 1020, and cathode polarity indicated by a band. It uses tungsten slugs and copper end caps with Sn/Pb finish in the "E" (D-5B) surface-mount package, with no marking and tape-and-reel packaging per EIA-481-B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 62 V ±1% at IZT = 20 mA - defines precise clamping/reference point in regulated power rails |
| Power Dissipation | 5 W @ TEC = 140 °C - supports high-energy transient suppression without derating in compact layouts |
| Dynamic Impedance ZZ | 42 Ω at IZT = 20 mA - ensures minimal output voltage variation under load current changes |
| Max Reverse Leakage IR | 2 μA at VR = 47.1 V - guarantees low standby power loss in battery-backed systems |
| Temp Coefficient αVZ | +0.100 %/°C - enables predictable voltage drift compensation in wide-temperature environments |
| Surge Current IZSM | 2.5 A (8.3 ms square wave) - withstands lightning-induced transients per MIL-STD-461/464 |
| Operating Temperature | −65 °C to +175 °C - qualified for jet engine bays, satellite power buses, and downhole tools |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), surface-mount, with two end-cap terminals. Cathode identified by band. No marking. Weight: 539 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lowest potential rail 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 seal | Eliminates moisture ingress and internal delamination risks in 100% humidity or vacuum environments |
| Category I metallurgical bond | Ensures mechanical integrity and thermal cycling reliability >1000 cycles between −65 °C and +175 °C |
| Triple-layer passivation | Prevents surface leakage paths and ion migration under high bias and radiation exposure |
| MIL-PRF-19500/356 JANTX qualification | Validated screening includes burn-in, temperature cycling, and lot acceptance testing per military standard |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) ≥100 krad(Si), per Microsemi MicroNote 050 |
Applications
| Aerospace Power Bus Protection | Satellite Voltage Reference |
|---|---|
Use Scenario: Clamping transient spikes on 28 V DC bus in launch vehicle avionics during pyro-shock events. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector, absorbing surge energy into ground path. Use Value: Withstands 2.5 A 8.3 ms surges and maintains <5 V regulation shift across −55 °C to +125 °C ambient. |
Use Scenario: Providing stable 62 V reference for ADC biasing and telemetry sensor excitation in LEO satellite payloads. IC Role / Device Role / Timing Role: Precision voltage reference element in analog front-end signal chain. Use Value: ±1% initial tolerance and +0.100 %/°C TC enable <±0.5% total error over full mission temperature range. |
| Downhole Oilfield Instrumentation | Military Radar Power Supply |
Use Scenario: Regulating auxiliary supply for MEMS pressure sensors in geothermal drill-string telemetry modules. IC Role / Device Role / Timing Role: Primary Zener regulator establishing local 62 V rail from unregulated 100–150 V input. Use Value: Operates continuously at +175 °C junction temperature with no parameter drift beyond spec limits. |
Use Scenario: Stabilizing gate drive voltage for GaN HEMT modulators in pulsed radar transmitter stages. IC Role / Device Role / Timing Role: Fast-response voltage clamp protecting gate driver ICs from inductive kickback. Use Value: 42 Ω dynamic impedance and 7 °C/W thermal resistance ensure sub-100 ns response to 1 kV/μs transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4977DUS/TR | Higher screening level: JANTXV adds extended temperature life test and enhanced lot traceability | Required for Class V spaceflight hardware where zero defect history is mandated | Select JANTXV1N4977DUS/TR only if program specification explicitly requires JANTXV screening |
| 1N4977US | Commercial-grade version; no MIL-PRF-19500 qualification, wider temp range (−65 °C to +150 °C), no radiation data | Suitable for industrial test equipment or non-critical avionics where cost and lead time outweigh radiation/military requirements | Use 1N4977US only in non-mission-critical designs with relaxed reliability and environmental specs |
Compared with JANTX1N4977DUS/TR, JANTXV1N4977DUS/TR provides higher assurance for zero-failure missions but at increased cost and longer lead time, while 1N4977US offers faster availability and lower price for commercial-grade robustness.
Availability
JANTX1N4977DUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, satellite telemetry subsystems, and downhole instrumentation requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4977DUS/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 defense, aerospace, and industrial markets.
The JANTX1N4977DUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener series, designed specifically for voltage regulation and transient protection in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance of JANTX1N4977DUS/TR?
JANTX1N4977DUS/TR has a nominal Zener voltage of 62 V with ±1% tolerance, indicated by the "D" suffix per Microsemi's part numbering convention. This tight tolerance is verified per MIL-PRF-19500/356 screening and applies at 25 °C with IZT = 20 mA. The JANTX1N4977DUS/TR maintains this specification across its full operating temperature range with defined temperature coefficient.
Is JANTX1N4977DUS/TR radiation hardened?
Yes, JANTX1N4977DUS/TR is inherently radiation hard per Microsemi MicroNote 050, exhibiting tolerance to total ionizing dose (TID) ≥100 krad(Si) without functional degradation. This property arises from its voidless-glass hermetic construction and Category I metallurgical bond, and is confirmed in JANTX-level qualification testing-not derived from inference or generic family claims.
What package type does JANTX1N4977DUS/TR use?
JANTX1N4977DUS/TR uses the "E" package, also known as D-5B, a surface-mount hermetically sealed voidless glass case with tungsten slugs and copper end caps finished with Sn/Pb. It conforms to EIA-481-B tape-and-reel packaging and has no part marking-cathode polarity is indicated solely by a band.
How does JANTX1N4977DUS/TR differ from commercial 1N4977US?
JANTX1N4977DUS/TR differs from 1N4977US in three key ways: it is screened to MIL-PRF-19500/356 JANTX level (including burn-in and temperature cycling), rated for +175 °C max junction temperature (vs. +150 °C), and documented for radiation hardness per MicroNote 050. The JANTX1N4977DUS/TR also carries tighter process controls and full lot traceability required for defense contracts.
What is the maximum continuous Zener current for JANTX1N4977DUS/TR?
The maximum continuous Zener current (IZM) for JANTX1N4977DUS/TR is 930 mA, calculated from its 5 W power rating and 62 V nominal Zener voltage (P = V × I). This value is valid at end-cap temperature ≤140 °C and assumes linear derating to zero at +175 °C junction temperature, as specified in the SD44A datasheet.
JANTX1N4977DUS/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:
- ±1%
- 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
JANTX1N4977DUS/TR FAQ
1.How can I place an order for JANTX1N4977DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4977DUS/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 JANTX1N4977DUS/TR reliable?
The price and inventory of JANTX1N4977DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4977DUS/TR is usually 5 days.
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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 JANTX1N4977DUS/TR?
For technical support, including JANTX1N4977DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4977DUS/TR requirements.
6.How does Aetrix verify that JANTX1N4977DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4977DUS/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 JANTX1N4977DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4977DUS/TR?
All JANTX1N4977DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4977DUS/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 JANTX1N4977DUS/TR part is unused and in its original packaging.
Return procedure for JANTX1N4977DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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