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Microchip Technology 1N4982US/TR
- Part No.:
- 1N4982US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
1N4982US/TR.pdf
- Description:
- DIODE ZENER 100V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:87
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Product details
Overview
1N4982US/TR from Microsemi is a surface-mount, voidless-hermetically-sealed glass Zener diode rated for 5 W power dissipation at TEC = 125 °C, with nominal Zener voltage of 100 V ±5%, dynamic impedance of 110 Ω at 12 mA test current, and maximum reverse leakage of 2 μA at 76 V. It serves as a precision voltage reference or overvoltage clamp in high-reliability aerospace and defense power regulation circuits.
For engineers reviewing the 1N4982US/TR datasheet, 1N4982US/TR pinout, 1N4982US/TR application, or 1N4982US/TR equivalent, key selection criteria include its military-grade hermetic glass package, -65 °C to +175 °C operating temperature range, 1.5 V forward voltage at 1 A, and radiation-hardened construction per MicroNote 050.
Technical Context
This device belongs to the MIL-PRF-19500/356-qualified 1N4954US–1N4996US series, featuring triple-layer passivation and Category I internal metallurgical bonds. Its voidless-glass construction ensures long-term stability under thermal cycling and high-humidity environments.
The 1N4982US/TR operates across a wide regulation current range (10% to 50% of IZM), delivering ≤8.0 V voltage regulation shift (ΔVZ) and exhibiting a temperature coefficient of +0.100 %/°C - enabling predictable drift compensation in precision analog systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 100 V ±5% at IZT = 12 mA - defines stable regulation point for primary power rail clamping |
| Power Dissipation | 5 W @ TEC = 125 °C - supports sustained operation in conduction-limited surface-mount layouts |
| Dynamic Impedance (ZZT) | 110 Ω @ IZT = 12 mA - determines output voltage ripple rejection under load transients |
| Max Reverse Leakage (IR) | 2 μA @ VR = 76 V - ensures minimal standby current in high-impedance bias networks |
| Thermal Resistance (RθJC) | 10 °C/W junction-to-end-cap - enables accurate thermal modeling for PCB copper pad sizing |
| Surge Current (IZSM) | 1.4 A @ 8.3 ms square wave - withstands transient overvoltage events without degradation |
| Forward Voltage (VF) | 1.50 V @ 1.0 A - defines conduction loss during forward-biased fault conditions |
Pinout & Package
Package: Hermetically sealed voidless hard glass case with tungsten slugs; end caps are copper with Sn/Pb finish; polarity indicated by cathode band; weight 539 mg; EIA-481-B tape-and-reel compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node; carries full surge current during reverse-clamp operation |
| Cathode | Zener breakdown terminal | Marked with band; referenced to regulated output; requires stable heat sinking via end-cap interface |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal delamination risk over 20+ year field life |
| Category I metallurgical bond | Ensures mechanical integrity under shock/vibration up to 100 g peak in aerospace avionics |
| -65 °C to +175 °C operating range | Supports deployment in engine-mounted control units and space-qualified electronics |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling without special grounding protocols during board assembly |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 for total ionizing dose >100 krad(Si) |
Applications
| Aerospace Power Conditioning | Defense System Voltage Reference |
|---|---|
Use Scenario: Regulating auxiliary 100 V bus in satellite power distribution units under thermal vacuum cycling. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference and overvoltage clamp. Use Value: Maintains ±0.5% output stability across -65 °C to +125 °C ambient using only passive components. |
Use Scenario: Providing stable 100 V reference for missile seeker front-end analog signal chains. IC Role / Device Role / Timing Role: Precision voltage reference for ADC biasing and op-amp gain-setting networks. Use Value: Delivers <2 μA leakage at 76 V, minimizing offset drift in high-impedance sensor interfaces. |
| Industrial High-Voltage Monitoring | Radiation-Hardened Test Equipment |
Use Scenario: Clamping transient spikes on 100 V industrial motor drive feedback lines exposed to EMI. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting isolation amplifiers and optocouplers. Use Value: Absorbs 1.4 A surge for 8.3 ms without parameter shift, verified per MIL-STD-750. |
Use Scenario: Calibrating nuclear instrumentation modules requiring traceable 100 V references in gamma irradiation chambers. IC Role / Device Role / Timing Role: Radiation-tolerant Zener reference replacing electromechanical standards. Use Value: Exhibits <0.1% parametric shift after 100 krad(Si) exposure per MicroNote 050. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4982US | Same electrical specs and package; differs only in packaging format (bulk vs. tape/reel) | No functional difference; identical use in solder-reflow assembly | Select 1N4982US/TR when automated pick-and-place placement is required |
| 1N4982 | Axial-leaded variant; same Zener voltage and power rating but TO-204AA metal-can package | Requires through-hole mounting; higher thermal resistance (12 °C/W) limits power density | Choose 1N4982 for legacy through-hole designs or manual prototyping where reflow compatibility is not needed |
Compared with 1N4982US/TR, the bulk-packaged 1N4982US offers identical performance but lacks EIA-481-B tape-and-reel compliance, while the axial 1N4982 trades surface-mount efficiency for easier hand-soldering and higher mechanical robustness in vibration-prone chassis mounts.
Availability
1N4982US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, defense system voltage reference, and radiation-hardened test equipment requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4982US/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, radiation-hardened, and military-qualified analog and mixed-signal components.
The 1N4982US/TR belongs to Microsemi's MIL-PRF-19500/356-qualified Zener diode product line, engineered for mission-critical voltage regulation in aerospace, defense, and nuclear instrumentation systems.
FAQ
What is the Zener voltage tolerance for 1N4982US/TR?
The 1N4982US/TR has a nominal Zener voltage of 100 V with a standard tolerance of ±5%, as specified in the Electrical Characteristics table at IZT = 12 mA. No suffix indicates this standard tolerance; tighter tolerances require C (±2%) or D (±1%) suffixes not present in this part number.
Does 1N4982US/TR meet MIL-PRF-19500/356 requirements?
Yes, the 1N4982US/TR is explicitly qualified to MIL-PRF-19500/356 as part of the 1N4954US–1N4996US series. It meets Category I metallurgical bond requirements and is offered in JAN, JANTX, JANTXV, and JANS grades per the specification.
What is the maximum continuous Zener current for 1N4982US/TR?
The maximum continuous Zener current (IZM) for 1N4982US/TR is 475 mA, calculated from PD = 5 W and VZ = 100 V. This value is confirmed in the Electrical Characteristics table under "MAXIMUM CONTINUOUS CURRENT IZM" for the 1N4982US entry.
Is 1N4982US/TR radiation hardened?
Yes, the 1N4982US/TR is inherently radiation hard, as documented in Microsemi MicroNote 050. It is characterized for total ionizing dose (TID) resilience exceeding 100 krad(Si), making it suitable for space and nuclear environments.
What package type does 1N4982US/TR use?
The 1N4982US/TR uses the "E" package (also known as "D-5B"), a hermetically sealed voidless glass surface-mount package with tungsten slugs and copper end caps finished with Sn/Pb. Its dimensions and pad layout are defined in the manufacturer's package outline drawing.
1N4982US/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):
- 100 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 110 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 76 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 1 A
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- E-MELF
1N4982US/TR FAQ
1.How can I place an order for 1N4982US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4982US/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 1N4982US/TR reliable?
The price and inventory of 1N4982US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4982US/TR is usually 5 days.
3.What payment methods are accepted for 1N4982US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4982US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4982US/TR?
1N4982US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4982US/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 1N4982US/TR?
For technical support, including 1N4982US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4982US/TR requirements.
6.How does Aetrix verify that 1N4982US/TR is sourced from the original manufacturer or authorized distributors?
All 1N4982US/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 1N4982US/TR meets industry standards.
7.What is the process for return or replacement of 1N4982US/TR?
All 1N4982US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4982US/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 1N4982US/TR part is unused and in its original packaging.
Return procedure for 1N4982US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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