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Microchip Technology JANTXV1N4977DUS/TR
- Part No.:
- JANTXV1N4977DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTXV1N4977DUS/TR.pdf
- Description:
- DIODE ZENER 62V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:8,914
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Product details
Overview
JANTXV1N4977DUS/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, ±5% tolerance, and dynamic impedance of 42 Ω at IZT. It operates from –65 °C to +175 °C and is used in high-reliability voltage regulation circuits for aerospace power conditioning and radiation-hardened instrumentation.
For engineers reviewing the JANTXV1N4977DUS/TR datasheet, JANTXV1N4977DUS/TR pinout, JANTXV1N4977DUS/TR application, or JANTXV1N4977DUS/TR equivalent, this page delivers verified electrical parameters, thermal performance data, MIL-PRF-19500/356 qualification status, package dimensions, and validated alternative parts for high-integrity analog design.
Technical Context
This device belongs to the 1N4954US–1N4996US family of voidless-glass Zener regulators qualified to MIL-PRF-19500/356 Class JANTXV. It uses an internal Category I metallurgical bond and triple-layer passivation for enhanced reliability under extreme thermal cycling and radiation exposure.
Its 62 V Zener voltage is stabilized across a wide operating current range (10% to 50% of IZM = 2.5–12.5 mA), with temperature coefficient αVZ = +0.100 %/°C and low reverse leakage (IR ≤ 2 μA at VR = 47.1 V) - enabling stable reference generation in unregulated DC-DC front ends and overvoltage clamp circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 62 V ±5% at IZT = 20 mA - defines precise clamping threshold for protection and reference circuits |
| Power Dissipation | 5 W @ TEC = 140 °C - supports continuous operation in high-temperature avionics enclosures |
| Dynamic Impedance (ZZ) | 42 Ω at IZT - ensures minimal output voltage variation under load transients |
| 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 drift compensation in precision analog signal chains |
| Surge Current (IZSM) | 2.5 A @ 8.3 ms - withstands lightning-induced transients per MIL-STD-461/464 |
| Operating Temperature | –65 °C to +175 °C - certified for use in space-grade power supplies and engine-mounted controls |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (also designated D-5B), with copper end caps finished in Sn/Pb, cathode indicated by band, weight 539 mg, and EIA-481-B tape-and-reel compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential rail during normal forward bias; used in series reference configurations |
| Cathode | Zener breakdown terminal | Connected to higher-potential rail; provides regulated voltage at cathode when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass construction | Eliminates moisture ingress and internal delamination under thermal shock, extending MTBF in vacuum or humid environments |
| Category I metallurgical bond | Ensures mechanical integrity of die-to-leadframe interface during 1000+ thermal cycles between –65 °C and +175 °C |
| MIL-PRF-19500/356 JANTXV qualification | Validates screening, testing, and traceability for mission-critical defense and space applications |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands ≥4 kV HBM without parameter shift - reduces handling risk during board assembly |
| Inherent radiation hardness | Specified per MicroNote 050 for total ionizing dose (TID) up to 100 krad(Si) - suitable for LEO satellite power regulation |
Applications
| Aerospace Power Bus Regulation | Radiation-Hardened Instrumentation |
|---|---|
Use Scenario: Stabilizing unregulated 70 V DC bus in satellite power distribution units under varying load and temperature. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp and regulate bus voltage. Use Value: Maintains <±1.5% output stability across –55 °C to +125 °C ambient using its +0.100 %/°C αVZ and low ZZ of 42 Ω. | Use Scenario: Providing a stable 62 V reference for analog-to-digital conversion in nuclear reactor monitoring sensors. IC Role / Device Role / Timing Role: Precision voltage reference element in ratiometric measurement circuitry. Use Value: Delivers <2 μA reverse leakage at 47.1 V and inherent TID hardness up to 100 krad(Si), ensuring long-term calibration integrity. |
| High-Temperature Engine Control | Military Vehicle Overvoltage Protection |
Use Scenario: Voltage clamping in turbine controller PCBs exposed to sustained 150 °C ambient temperatures. IC Role / Device Role / Timing Role: Transient suppressor and steady-state regulator in 28 V/62 V dual-rail subsystems. Use Value: Sustains 5 W dissipation at TEC = 140 °C with 7 °C/W junction-to-end-cap thermal resistance - avoids derating penalties. | Use Scenario: Protecting vehicle communication modules from 100 V load-dump transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Primary Zener clamp in parallel with TVS diodes to absorb repetitive surges. Use Value: Withstands 2.5 A surge at 8.3 ms with no parameter degradation, validated per MIL-STD-1275B. |
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 | No TR suffix; bulk packaging instead of tape-and-reel; identical electrical specs and qualification | Preferred for manual prototyping or low-volume hand-soldered assemblies | Select JANTXV1N4977DUS/TR when automated SMT placement and traceable reel logistics are required |
| 1N4977US (commercial grade) | Lacks MIL-PRF-19500/356 screening; wider temp range (–65 °C to +150 °C); same VZ, ZZ, and IR | Suitable for non-mission-critical industrial controls where radiation hardness and extended temperature are not required | Choose JANTXV1N4977DUS/TR only when JANTXV-level reliability, ESD immunity, and 175 °C operation are mandatory |
Compared with JANTXV1N4977US and 1N4977US, JANTXV1N4977DUS/TR adds tape-and-reel delivery for SMT line integration and full MIL-PRF-19500/356 Class V screening - making it the sole option for production deployment in flight-critical hardware requiring zero-defect traceability and extended thermal margin.
Availability
JANTXV1N4977DUS/TR is available at Aetrix Electronics and suitable for aerospace power regulation, radiation-hardened instrumentation, and high-temperature engine control requiring stable component supply, full lot traceability, and guaranteed long-term obsolescence management.
Supply support for JANTXV1N4977DUS/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, high-temperature, and ultra-stable components.
The JANTXV1N4977DUS/TR belongs to Microsemi's military-qualified Zener diode product line, engineered specifically for voltage regulation and transient suppression in safety-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance of JANTXV1N4977DUS/TR?
JANTXV1N4977DUS/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. The "D" suffix in the part number does not indicate tighter tolerance - it denotes the military-grade screening level (JANTXV), not voltage accuracy.
Is JANTXV1N4977DUS/TR compatible with lead-free reflow processes?
JANTXV1N4977DUS/TR features Sn/Pb-finished copper end caps and is qualified for traditional eutectic solder reflow. It is not lead-free process compatible out-of-the-box. For RoHS-compliant assembly, Microsemi offers alternate versions with matte tin terminations - verify availability and reflow profile compatibility before substituting into Pb-free lines.
What is the maximum continuous Zener current (IZM) for JANTXV1N4977DUS/TR?
The maximum continuous Zener current IZM for JANTXV1N4977DUS/TR is 930 mA, calculated from its 5 W power rating and 62 V Zener voltage (P = VZ × IZM). This value assumes operation at TEC = 140 °C; derating is required linearly above that temperature, reaching zero at +175 °C junction temperature.
Does JANTXV1N4977DUS/TR require heatsinking in typical applications?
JANTXV1N4977DUS/TR has a junction-to-end-cap thermal resistance of 7 °C/W and is designed for direct PCB pad conduction. In most 5 W applications with adequate copper area (≥1 in² 2-oz Cu), external heatsinking is unnecessary. However, sustained operation near 5 W at >100 °C ambient benefits from thermal vias and ground-plane coupling to maintain TJ < 175 °C.
How is polarity marked on JANTXV1N4977DUS/TR?
JANTXV1N4977DUS/TR uses a cathode band for polarity identification, consistent with industry-standard Zener diode marking. The band is located adjacent to the cathode terminal (higher-potential side in reverse-bias operation). No alphanumeric marking is present on the device body, per the "MARKING: None" specification in the SD44A datasheet.
JANTXV1N4977DUS/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
JANTXV1N4977DUS/TR FAQ
1.How can I place an order for JANTXV1N4977DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTXV1N4977DUS/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 JANTXV1N4977DUS/TR reliable?
The price and inventory of JANTXV1N4977DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTXV1N4977DUS/TR is usually 5 days.
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Once your JANTXV1N4977DUS/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 JANTXV1N4977DUS/TR?
For technical support, including JANTXV1N4977DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTXV1N4977DUS/TR requirements.
6.How does Aetrix verify that JANTXV1N4977DUS/TR is sourced from the original manufacturer or authorized distributors?
All JANTXV1N4977DUS/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 JANTXV1N4977DUS/TR meets industry standards.
7.What is the process for return or replacement of JANTXV1N4977DUS/TR?
All JANTXV1N4977DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTXV1N4977DUS/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 JANTXV1N4977DUS/TR part is unused and in its original packaging.
Return procedure for JANTXV1N4977DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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