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Microchip Technology 1N4482US/TR
- Part No.:
- 1N4482US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, A
- Datasheet:
-
1N4482US/TR.pdf
- Description:
- DIODE ZENER 51V 1.5W D5A
- Quantity:
- Payment:
- Shipping:
Inventory:9,607
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Product details
Overview
1N4482US/TR from Microsemi is a hermetically sealed, voidless glass MELF (D-5A) surface-mount Zener diode rated for 1.5 W steady-state power dissipation, with a nominal Zener voltage of 51.0 V at 5.0 mA test current, ±5% tolerance, and maximum dynamic impedance of 60 Ω at IZT. It operates across –65 °C to +175 °C junction temperature and is qualified to MIL-PRF-19500/406 at JANTXV level for high-reliability voltage regulation in aerospace power conditioning circuits.
For engineers reviewing the 1N4482US/TR datasheet, 1N4482US/TR pinout, 1N4482US/TR application, or 1N4482US/TR equivalent, key selection criteria include its military-grade hermetic glass construction, 51 V regulation stability over wide temperature and current ranges, low leakage (<0.25 µA at 40.8 V), and compatibility with automated SMT assembly per EIA-481-B tape-and-reel packaging.
Technical Context
This device functions as a precision shunt voltage regulator in feedback loops and reference circuits where failure tolerance is critical. Its internal Category I metallurgical bond ensures mechanical robustness under thermal cycling and shock, while triple-layer passivation enhances long-term reliability in harsh environments.
The 1N4482US/TR exhibits a Zener knee current (IZK) of 0.05 mA and corresponding knee impedance (ZZK) of 1100 Ω, enabling stable regulation even near breakdown threshold. Its thermal resistance junction-to-end cap is 20 °C/W, supporting operation up to 175 °C with appropriate PCB copper area for heat spreading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51.0 V at IZT = 5.0 mA - precise regulation point for mid-range high-voltage references |
| Power Dissipation (PD) | 1.5 W @ TA = 25 °C - supports continuous regulation in compact SMT layouts with adequate thermal relief |
| Dynamic Impedance (ZZT) | 60 Ω @ IZT - low AC impedance ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | <0.25 µA @ VR = 40.8 V - negligible current draw in standby, critical for low-power bias networks |
| Junction Temperature Range | –65 °C to +175 °C - enables deployment in extended-temperature avionics and downhole electronics |
| Tolerance | ±5% (no suffix) - standard industrial/military grade accuracy without tighter-tolerance cost premium |
| Package | D-5A MELF - cylindrical glass body with tungsten slugs, optimized for high-reliability reflow and hermetic sealing |
Pinout & Package
Hermetically sealed voidless glass MELF (D-5A) package with cathode indicated by a single polarity band; terminals are tin/lead (Sn/Pb) or RoHS-compliant matte tin over copper; weight: 193 mg; dimensions: BD = 0.091–0.103 in (2.31–2.62 mm), BL = 0.168–0.200 in (4.28–5.08 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; carries full regulator current during clamping |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher-potential node; defines regulated output voltage referenced to anode |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal delamination risk under thermal stress, ensuring >20-year operational life in sealed enclosures |
| Category I metallurgical bond | Validated mechanical integrity for MIL-STD-883 methods, supporting shock/vibration requirements in flight control systems |
| Triple-layer passivation | Prevents surface contamination-induced leakage drift in humid or saline environments |
| JANTXV qualification | Fully screened per MIL-PRF-19500/406 for space-qualified applications requiring zero defect lot traceability |
| Non-ESD-sensitive design | Immune to damage per MIL-STD-750 Method 1020, removing need for handling precautions in production lines |
Applications
| Aerospace Power Conditioning | Downhole Instrumentation Reference |
|---|---|
Use Scenario: Regulating auxiliary rail voltage in satellite DC-DC converter feedback networks under radiation exposure. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 51 V setpoint for error amplifier input. Use Value: Radiation-hardened behavior and 175 °C max junction temperature enable uninterrupted operation in LEO orbital thermal cycles. |
Use Scenario: Establishing precision bias voltage for analog front-end amplifiers in oil-well logging tools. IC Role / Device Role / Timing Role: High-stability Zener reference maintaining accuracy across –55 °C to +175 °C ambient extremes. Use Value: <0.25 µA leakage at 40.8 V prevents signal degradation in ultra-low-current sensor interfaces. |
| Military Radar Bias Supply | Avionics Sensor Excitation |
Use Scenario: Providing stable gate bias for GaN RF power amplifiers in airborne radar transceivers. IC Role / Device Role / Timing Role: Low-impedance voltage clamp protecting amplifier stages from supply transients. Use Value: 60 Ω dynamic impedance minimizes VOUT perturbation during pulsed RF load modulation. |
Use Scenario: Supplying excitation voltage to piezoresistive pressure sensors in flight control units. IC Role / Device Role / Timing Role: Primary voltage reference defining sensor bridge operating point. Use Value: Hermetic D-5A package prevents moisture ingress-induced calibration drift over 15+ year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4482US | Same electrical specs and package, but supplied in bulk (not tape-and-reel); no TR suffix | Requires manual placement or custom feeding; unsuitable for high-speed SMT lines | Select 1N4482US/TR when automated pick-and-place integration and EIA-481-B compliance are required |
| SMF51A (ON Semiconductor) | Surface-mount SOD-123 package, 51 V, 1.0 W, ±5%, but not MIL-qualified or hermetically sealed | Limited to commercial-grade industrial controls; lacks radiation hardness and extended temperature capability | Choose SMF51A only for cost-sensitive, non-mission-critical applications where JANTXV screening is unnecessary |
Compared with 1N4482US/TR, the bulk 1N4482US sacrifices SMT automation support for simpler logistics, while SMF51A trades military reliability and hermeticity for lower cost and smaller footprint-neither is a drop-in replacement due to package and qualification differences.
Availability
1N4482US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, downhole instrumentation reference, and military radar bias supply requiring stable component supply with full traceability and extended-temperature performance.
Supply support for 1N4482US/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 Corporation (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 1N4482US/TR belongs to Microsemi's MIL-PRF-19500/406-qualified Zener diode family, engineered specifically for voltage regulation in mission-critical systems where hermeticity, radiation tolerance, and extreme temperature resilience are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4482US/TR?
The 1N4482US/TR has a nominal Zener voltage of 51.0 V with a standard tolerance of ±5%, as indicated by the absence of a tolerance suffix (e.g., 'C' for ±2% or 'D' for ±1%). This tolerance is specified at 25 °C case temperature and applies across the full operating junction temperature range of –65 °C to +175 °C per MIL-PRF-19500/406 test conditions.
Is 1N4482US/TR RoHS compliant?
The 1N4482US/TR is available in both RoHS-compliant and non-RoHS versions. RoHS compliance is indicated by the 'e3' suffix in the full part marking (e.g., 1N4482US/TR e3), and applies only to commercial-grade units. JANTXV-qualified units retain Sn/Pb terminations per MIL-PRF-19500/406 requirements and are not RoHS compliant.
What does the 'TR' suffix mean in 1N4482US/TR?
The 'TR' suffix in 1N4482US/TR denotes tape-and-reel packaging per EIA-481-B standards, enabling compatibility with automated SMT placement equipment. It specifies carrier tape width, sprocket hole pitch, component orientation, and reel quantity-distinct from the bulk-packaged 1N4482US variant which lacks this SMT-ready format.
What is the maximum reverse leakage current for 1N4482US/TR?
The maximum reverse leakage current (IR) for 1N4482US/TR is 0.25 µA when measured at a reverse voltage (VR) of 40.8 V (80% of nominal VZ) and TA = 25 °C. This value remains valid across the full junction temperature range and is verified per MIL-PRF-19500/406 test method 3012.
Can 1N4482US/TR be used in place of 1N4482US?
Yes, 1N4482US/TR is electrically and thermally identical to 1N4482US-the only difference is packaging format. The 'TR' version is supplied on EIA-481-B tape-and-reel for automated assembly, while 1N4482US is bulk-packed. Both share identical Zener voltage, power rating, hermetic glass construction, and JANTXV qualification.
1N4482US/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, A
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 60 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 40.8 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:
- D-5A
1N4482US/TR FAQ
1.How can I place an order for 1N4482US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4482US/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 1N4482US/TR reliable?
The price and inventory of 1N4482US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4482US/TR is usually 5 days.
3.What payment methods are accepted for 1N4482US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4482US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4482US/TR?
1N4482US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4482US/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 1N4482US/TR?
For technical support, including 1N4482US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4482US/TR requirements.
6.How does Aetrix verify that 1N4482US/TR is sourced from the original manufacturer or authorized distributors?
All 1N4482US/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 1N4482US/TR meets industry standards.
7.What is the process for return or replacement of 1N4482US/TR?
All 1N4482US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4482US/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 1N4482US/TR part is unused and in its original packaging.
Return procedure for 1N4482US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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