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Microchip Technology 1N4480US/TR
- Part No.:
- 1N4480US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, A
- Datasheet:
-
1N4480US/TR.pdf
- Description:
- DIODE ZENER 43V 1.5W D5A
- Quantity:
- Payment:
- Shipping:
Inventory:94
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Product details
Overview
1N4480US/TR from Microsemi is a hermetically sealed, voidless glass MELF surface-mount Zener diode rated for 1.5 W steady-state power dissipation, with a nominal Zener voltage of 43.0 V at 6.0 mA test current, dynamic impedance of 40 Ω at IZT, and maximum reverse leakage of 0.25 µA at 34.4 V. It is qualified to MIL-PRF-19500/406 (JAN/JANTXV levels) and used in high-reliability voltage regulation for aerospace power conditioning and radiation-hardened instrumentation.
For engineers reviewing the 1N4480US/TR datasheet, 1N4480US/TR pinout, 1N4480US/TR application, or 1N4480US/TR equivalent, this page delivers verified military-grade Zener parameters, thermal derating behavior, package dimensions, and direct alternatives with documented voltage/tolerance/power differences - critical for space-qualified analog reference design and legacy system sustainment.
Technical Context
This device operates as a precision shunt voltage regulator in reverse-biased breakdown mode, delivering stable 43.0 V output across 0.05–0.33 mA operating current range with ±5% tolerance (no suffix). Its voidless glass/MELF construction enables operation from –65 °C to +175 °C junction temperature and intrinsic radiation hardness per MicroNote 050.
The 1N4480US/TR uses Category I internal metallurgical bonds, exhibits 20 °C/W junction-to-end-cap thermal resistance, and maintains <0.25 µA reverse leakage at 80% of VZ - enabling low-power biasing in high-temperature sensor front-ends and satellite telemetry regulators without thermal runaway risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43.0 V at 6.0 mA - defines regulated output voltage under nominal bias; used for reference generation in analog signal chains. |
| Power Dissipation (PD) | 1.5 W @ TA = 25 °C - sets maximum continuous power handling before thermal derating begins; requires heatsinking above 70 °C ambient. |
| Dynamic Impedance (ZZT) | 40 Ω at IZT = 6.0 mA - determines regulation stiffness; lower values improve line/load regulation in feedback loops. |
| Reverse Leakage (IR) | 0.25 µA @ VR = 34.4 V - ensures minimal error current in high-impedance reference nodes; critical for low-power battery-backed systems. |
| Junction Temperature Range | –65 °C to +175 °C - supports operation in extreme environments including spacecraft avionics and downhole oilfield electronics. |
| Tolerance | ±5% (no suffix) - defines initial accuracy band; tighter 1%/2% variants available as 1N4480USD/TR and 1N4480USC/TR. |
| Package | A (D-5A) MELF - cylindrical glass body with tungsten slugs; requires reflow-compatible pad layout per EIA-481-B tape-and-reel standard. |
Pinout & Package
Hermetically sealed voidless glass MELF package (A/D-5A), 0.168–0.200 inch length × 0.091–0.103 inch diameter, cathode indicated by single black band. Tin/lead or RoHS-compliant matte tin terminations over copper; weight 193 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in shunt regulator configuration; carries full load current during forward bias. |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher-potential node; sinks current to maintain regulated voltage at cathode-to-anode potential. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal delamination - essential for >20-year mission life in vacuum or humid environments. |
| Triple-layer passivation | Prevents surface leakage and contamination-induced parameter drift under ionizing radiation exposure. |
| Category I metallurgical bond | Ensures mechanical integrity and thermal cycling reliability up to 1000 cycles between –65 °C and +175 °C. |
| MIL-PRF-19500/406 qualification | Validated screening includes burn-in, temperature cycling, and lot acceptance testing per JAN/JANTXV requirements. |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) ≥100 krad(Si); no additional shielding required in LEO missions. |
Applications
| Aerospace Power Conditioning | Satellite Telemetry Reference |
|---|---|
Use Scenario: Regulating unregulated bus voltage in satellite power distribution units where thermal cycling and radiation exposure occur. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 43.0 V rail for ADC biasing and op-amp supply in telemetry signal conditioning. Use Value: Maintains ±0.5% regulation over –40 °C to +85 °C ambient due to low tempco and hermetic stability - reducing calibration drift in flight software. |
Use Scenario: Generating precise reference voltage for analog-to-digital conversion of sensor data in deep-space probe subsystems. IC Role / Device Role / Timing Role: Zener-based voltage reference in isolated DC-DC converter feedback loop for telemetry analog front-end. Use Value: Delivers <0.25 µA leakage at 34.4 V, minimizing offset error in 24-bit sigma-delta ADC reference inputs under low-power sleep modes. |
| Downhole Oilfield Instrumentation | Military Avionics Bias Supply |
Use Scenario: Providing stable bias voltage for piezoresistive pressure transducers exposed to 175 °C wellbore temperatures. IC Role / Device Role / Timing Role: High-temperature shunt regulator maintaining excitation voltage for Wheatstone bridge sensors. Use Value: Operates continuously at +175 °C junction temperature with no parameter shift - validated per MIL-PRF-19500/406 thermal life testing. |
Use Scenario: Generating reference voltage for cockpit display brightness control circuits in fighter jet HUD systems. IC Role / Device Role / Timing Role: Precision Zener element in analog dimming circuit regulating LED driver current setpoint. Use Value: Survives 1000g shock and 20g vibration per MIL-STD-883 without parametric shift - ensuring consistent display luminance during high-G maneuvers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4480USC/TR | Same 43.0 V nominal Zener voltage but ±2% tolerance (C suffix); identical package and thermal specs. | Used where tighter initial accuracy is required for closed-loop feedback without post-calibration. | Select when system-level gain error budget demands <±100 mV absolute reference deviation at 25 °C. |
| 1N4480USD/TR | Same 43.0 V nominal Zener voltage but ±1% tolerance (D suffix); otherwise identical electrical and mechanical characteristics. | Deployed in metrology-grade reference designs requiring traceable calibration and minimal drift over time. | Choose when long-term stability and reduced temperature coefficient variation justify premium cost over standard 5% version. |
Compared with 1N4480US/TR, the 1N4480USC/TR and 1N4480USD/TR offer improved initial accuracy (±2% and ±1%) while retaining identical power rating, thermal resistance, and radiation hardness - making them drop-in upgrades for applications where reference precision outweighs cost sensitivity.
Availability
1N4480US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, satellite telemetry reference, and downhole oilfield instrumentation requiring stable component supply with guaranteed MIL-spec compliance and long-term obsolescence management.
Supply support for 1N4480US/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 manufacturer specializing in high-reliability, radiation-hardened, and military-qualified analog and mixed-signal components.
The 1N4480US/TR belongs to Microsemi's legacy MIL-PRF-19500/406-qualified Zener diode family, engineered specifically for voltage regulation in mission-critical systems where failure is not an option - including spaceflight, defense avionics, and nuclear instrumentation.
FAQ
What is the Zener voltage tolerance for 1N4480US/TR?
The 1N4480US/TR has a nominal Zener voltage of 43.0 V with a standard tolerance of ±5%, as indicated by the absence of a tolerance suffix in the part number. Tighter tolerances are available: ±2% (1N4480USC/TR) and ±1% (1N4480USD/TR). This ±5% band defines the allowable initial deviation at 25 °C and 6.0 mA test current, and is fully characterized per MIL-PRF-19500/406 screening.
Is 1N4480US/TR RoHS compliant?
The 1N4480US/TR is available in both RoHS-compliant and non-RoHS versions. RoHS compliance is indicated by the "e3" suffix in the full nomenclature (e.g., 1N4480US e3/TR), and applies only to commercial-grade units. Military-grade versions (JAN/JANTXV) retain Sn/Pb terminations per MIL-STD-1276 and are not RoHS compliant.
What is the maximum reverse leakage current for 1N4480US/TR?
The maximum reverse leakage current for 1N4480US/TR is 0.25 µA at a reverse voltage of 34.4 V (80% of nominal VZ). This value is measured at 25 °C case temperature and is guaranteed per the Electrical Characteristics table on page 3 of T4-LDS-0183-1. Leakage remains below 1.0 µA up to 150 °C junction temperature.
Does 1N4480US/TR require heatsinking in typical applications?
1N4480US/TR dissipates up to 1.5 W at 25 °C ambient, but its 20 °C/W junction-to-end-cap thermal resistance means junction temperature rises ~30 °C per watt. At full 1.5 W, TJ reaches 70 °C above ambient - well within its –65 °C to +175 °C rating. Heatsinking is optional for most applications but recommended if sustained power exceeds 1.0 W above 50 °C ambient.
What package type does 1N4480US/TR use, and what are its key dimensions?
1N4480US/TR uses the A (D-5A) MELF package: a hermetically sealed voidless glass cylinder with tungsten slugs. Key dimensions are length 0.168–0.200 inch (4.28–5.08 mm), diameter 0.091–0.103 inch (2.31–2.62 mm), and weight 193 mg. Pad layout follows EIA-481-B tape-and-reel standards with center adhesive option per datasheet page 6.
1N4480US/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):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 34.4 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
1N4480US/TR FAQ
1.How can I place an order for 1N4480US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4480US/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 1N4480US/TR reliable?
The price and inventory of 1N4480US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4480US/TR is usually 5 days.
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1N4480US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4480US/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 1N4480US/TR?
For technical support, including 1N4480US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4480US/TR requirements.
6.How does Aetrix verify that 1N4480US/TR is sourced from the original manufacturer or authorized distributors?
All 1N4480US/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 1N4480US/TR meets industry standards.
7.What is the process for return or replacement of 1N4480US/TR?
All 1N4480US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4480US/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 1N4480US/TR part is unused and in its original packaging.
Return procedure for 1N4480US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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