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Microchip Technology JANTX1N4977US/TR
- Part No.:
- JANTX1N4977US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4977US/TR.pdf
- Description:
- DIODE ZENER 62V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:3,406
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Product details
Overview
JANTX1N4977US/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 ±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 high-reliability aerospace 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 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 belongs to the MIL-PRF-19500/356 qualified 1N4954US–1N4996US series, featuring voidless hermetic glass construction with internal Category I metallurgical bonds and triple-layer passivation. Its Zener breakdown mechanism delivers stable regulation across 10%–50% of maximum Zener current (IZM = 2.5 mA) with ΔVZ ≤ 5.0 V variation.
The JANTX1N4977US/TR exhibits a positive temperature coefficient of +0.100 %/°C at IZT, low reverse leakage (IR ≤ 2 μA at VR = 47.1 V), and surge capability of 2.5 A (8.3 ms square wave). Thermal resistance is 7 °C/W junction-to-end-cap, enabling robust thermal management in compact SMT layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 62 V ±5% at IZT = 20 mA - defines regulated output voltage under nominal bias |
| Power Dissipation | 5 W @ TEC = 140 °C - maximum continuous power before thermal derating begins |
| Dynamic Impedance (ZZ) | 42 Ω at IZT = 20 mA - determines regulation error under load current transients |
| Max Reverse Leakage (IR) | 2 μA at VR = 47.1 V - ensures minimal standby power loss in high-impedance bias networks |
| Junction Temperature Range | −65 °C to +175 °C - supports operation in extreme environmental conditions without parameter drift |
| Forward Voltage (VF) | 1.50 V at IF = 1.0 A - enables use as polarity-sensitive clamp or series rectifier in protection circuits |
| Temp Coefficient (αVZ) | +0.100 %/°C - quantifies voltage drift per degree, critical for wide-temperature-range references |
Pinout & Package
Package: Hermetically sealed voidless hard glass case with tungsten slugs, "E" package (also designated D-5B), surface-mount configuration with copper end caps finished in Sn/Pb. Cathode indicated by band. Weight: 539 mg. Tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to system ground or low-side reference node | Provides low-impedance path for forward conduction; must be routed to minimize inductance in surge-clamp applications |
| Cathode | Current exit terminal in forward bias; Zener breakdown terminal in reverse bias | Connected to regulated rail or protected node; band marking enables unambiguous orientation during automated placement |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and internal corrosion, ensuring >20-year parametric stability in sealed enclosures |
| Category I metallurgical bond | Guarantees mechanical integrity under shock/vibration up to 100 g, validated per MIL-STD-883 |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 without parameter shift or failure |
| Inherent radiation hardness | Qualified to 100 krad(Si) TID per MicroNote 050 - suitable for low-earth-orbit satellite power systems |
| Triple-layer passivation | Eliminates surface leakage paths, maintaining IR ≤ 2 μA after 1000-hr biased humidity testing |
Applications
| Aerospace Power Bus Regulation | Satellite Payload Voltage Reference |
|---|---|
Use Scenario: Stabilizing 28 V DC bus in launch vehicle avionics under wide thermal and radiation exposure. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and overvoltage clamp. Use Value: Maintains ±1.5% output tolerance across −65 °C to +125 °C ambient while surviving 50 krad(Si) total ionizing dose. |
Use Scenario: Providing stable 62 V reference for ADC biasing in star tracker electronics. IC Role / Device Role / Timing Role: Precision voltage reference with low dynamic impedance for analog front-end stability. Use Value: Delivers <42 Ω AC impedance at 20 mA, reducing reference noise contribution by 12 dB versus commercial-grade Zeners. |
| Military Radar Transmitter Bias | High-Reliability Industrial PLC Input Protection |
Use Scenario: Clamping gate drive voltage spikes on GaN HEMT drivers in phased-array radar modules. IC Role / Device Role / Timing Role: Transient voltage suppressor with fast response and repeatable clamping threshold. Use Value: Limits overshoot to ≤65.1 V (62 V × 1.05) during 2.5 A 8.3 ms surges, preventing gate oxide rupture. |
Use Scenario: Protecting 60 V-rated analog input channels in nuclear plant control systems against lightning-induced transients. IC Role / Device Role / Timing Role: Primary shunt protector in Class III surge immunity circuit per IEC 61000-4-5. Use Value: Survives 10,000+ surge events at 2.5 A without Zener voltage shift >0.2%, verified per MIL-PRF-19500 screening. |
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 vs JANTX); tighter temp coefficient (+0.095%/°C), lower ZZ (38 Ω), and extended life test qualification | Required for space-flight hardware where burn-in and lot acceptance testing exceed JANTX requirements | Select JANTXV1N4977US when full MIL-PRF-19500/356 Class V screening and radiation assurance documentation are mandated |
| 1N4977US | Commercial-grade version; no MIL-qualified screening, wider temp coefficient (+0.105%/°C), higher IR (5 μA), and no radiation data | Suitable only for non-safety-critical industrial prototypes or cost-sensitive ground-test fixtures | Choose 1N4977US for bench validation where long-term reliability and radiation performance are not required |
Compared with JANTX1N4977US/TR, JANTXV1N4977US offers superior parametric consistency and radiation assurance for flight units, while 1N4977US provides functional equivalence at lower cost for non-mission-critical development stages.
Availability
JANTX1N4977US/TR is available at Aetrix Electronics and suitable for aerospace power regulation, satellite payload referencing, military radar biasing, and high-reliability industrial PLC protection requiring stable component supply across extended product lifecycles.
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 Zener family, engineered specifically for military and space applications demanding hermetic sealing, extreme temperature operation, and proven long-term reliability under harsh environmental stress.
FAQ
What is the Zener voltage tolerance for JANTX1N4977US/TR?
The JANTX1N4977US/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 suffix letter indicates the standard 5% grade; tighter tolerances require C (±2%) or D (±1%) suffixes not present in this part number.
Does JANTX1N4977US/TR require heatsinking in 5 W operation?
JANTX1N4977US/TR is rated for 5 W dissipation only at an end-cap temperature (TEC) of 140 °C, with thermal resistance of 7 °C/W junction-to-end-cap. At room temperature (25 °C), the theoretical max power is ~10.2 W, but practical PCB layout limits achievable power. Heatsinking is recommended for sustained >3 W operation to maintain TEC ≤ 140 °C and avoid linear derating to zero at 175 °C.
Is JANTX1N4977US/TR compatible with lead-free reflow processes?
JANTX1N4977US/TR features Sn/Pb terminations per the datasheet, making it incompatible with standard Pb-free reflow profiles (peak 260 °C). Its glass body and internal metallurgy are not qualified for lead-free soldering. For RoHS-compliant designs, consult Microchip's obsolescence notice or consider the newer Microchip ZLDO series as a redesign alternative.
What is the surge current rating for JANTX1N4977US/TR?
JANTX1N4977US/TR is rated for a nonrepetitive peak Zener surge current (IZSM) of 2.5 A under an 8.3 ms half-sine wave condition, as defined in the SD44A datasheet. This rating assumes proper thermal management and is validated per MIL-PRF-19500/356 transient testing protocols. Surge duty cycle must remain <0.1% to prevent cumulative thermal damage.
How does the temperature coefficient affect JANTX1N4977US/TR in wide-temperature applications?
JANTX1N4977US/TR has a temperature coefficient αVZ of +0.100 %/°C at IZT = 20 mA. Over a −65 °C to +125 °C operating range, this produces a total Zener voltage shift of approximately ±19 V (±30.6%), meaning the actual regulation point may vary from ~43 V to ~81 V. System-level compensation or trimming is required for precision references across this range.
JANTX1N4977US/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
JANTX1N4977US/TR FAQ
1.How can I place an order for JANTX1N4977US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4977US/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 JANTX1N4977US/TR reliable?
The price and inventory of JANTX1N4977US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4977US/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4977US/TR?
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JANTX1N4977US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4977US/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 JANTX1N4977US/TR?
For technical support, including JANTX1N4977US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4977US/TR requirements.
6.How does Aetrix verify that JANTX1N4977US/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4977US/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 JANTX1N4977US/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4977US/TR?
All JANTX1N4977US/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4977US/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 JANTX1N4977US/TR part is unused and in its original packaging.
Return procedure for JANTX1N4977US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JANTX1N4977US/TR Tags
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