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Microchip Technology 1N4471DUS/TR
- Part No.:
- 1N4471DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, A
- Datasheet:
-
1N4471DUS/TR.pdf
- Description:
- DIODE ZENER 18V 1.5W D5A
- Quantity:
- Payment:
- Shipping:
Inventory:6,531
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Product details
Overview
1N4471DUS/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 18.0 V at 14.0 mA test current, ±1% tolerance (denoted by 'D' suffix), and qualified to MIL-PRF-19500/406 JANTXV level for high-reliability voltage regulation in aerospace power conditioning circuits.
For engineers reviewing the 1N4471DUS/TR datasheet, 1N4471DUS/TR pinout, 1N4471DUS/TR application, or 1N4471DUS/TR equivalent, this page delivers verified electrical parameters, military-grade qualification context, thermal impedance data per Figure 3, package dimensions, and direct alternatives for ruggedized analog reference and overvoltage protection designs.
Technical Context
This device operates as a precision shunt voltage regulator in reverse-biased breakdown mode, with a specified Zener voltage of 18.0 V at IZT = 14.0 mA and dynamic impedance ZZT = 11 Ω. Its junction-to-end-cap thermal resistance is 20 °C/W, and it exhibits a maximum reverse leakage current of 0.25 µA at 14.4 V.
The 1N4471DUS/TR uses an internal Category I metallurgical bond and triple-layer passivation, enabling operation across –65 °C to +175 °C junction temperature range while maintaining stability under radiation exposure per MicroNote 050 and ESD immunity per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18.0 V at 14.0 mA - precise regulation point for stable reference generation |
| Power Dissipation (PD) | 1.5 W @ 25 °C - supports continuous regulation in compact surface-mount layouts |
| Tolerance | ±1% - tight voltage accuracy enabled by 'D' suffix, critical for metrology-grade references |
| Dynamic Impedance (ZZT) | 11 Ω @ IZT - low AC impedance ensures minimal output voltage variation under load transients |
| Junction Temperature Range | –65 °C to +175 °C - enables deployment in extreme-environment avionics and downhole electronics |
| Thermal Resistance (RθJEC) | 20 °C/W - defines thermal path efficiency from junction to end cap for thermal design margining |
| Reverse Leakage (IR) | 0.25 µA @ 14.4 V - ultra-low leakage preserves accuracy in high-impedance bias networks |
Pinout & Package
Package: D-5A MELF (Metal Electrode Leadless Face) - hermetically sealed voidless glass case with tungsten slugs, cathode indicated by single polarity band, weight 193 mg, RoHS-compliant matte tin termination available for commercial grade only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in shunt regulator | Connected to system ground or lower-potential node during Zener operation |
| Cathode | Zener breakdown terminal / high-side connection in shunt regulator | Connected to regulated voltage rail; marked by visible band on glass body |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass construction | Eliminates internal delamination risk and moisture ingress, ensuring long-term parameter stability in humid or vacuum environments |
| Category I metallurgical bond | Provides mechanical robustness and thermal cycle reliability exceeding MIL-PRF-19500/406 requirements for 1N4462US–1N4496US series |
| Triple-layer passivation | Enhances surface insulation integrity and prevents leakage path formation under high humidity or contamination |
| MIL-PRF-19500/406 JANTXV qualification | Validates performance across extended temperature, shock, vibration, and life testing for flight-critical subsystems |
| Radiation hardness (per MicroNote 050) | Enables use in low-earth orbit and nuclear instrumentation without parameter shift or catastrophic failure |
Applications
| Aerospace Power Conditioning | Downhole Sensor Reference |
|---|---|
Use Scenario: Regulating auxiliary supply rails in satellite DC-DC converters exposed to thermal cycling and radiation. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 18 V bias for op-amps and ADC drivers. Use Value: ±1% tolerance and –65 °C to +175 °C operation ensure reference accuracy across orbital thermal extremes. | Use Scenario: Establishing precision bias voltage for piezoresistive pressure transducers in oil/gas well logging tools. IC Role / Device Role / Timing Role: Primary Zener reference in high-temperature analog front-end signal chains. Use Value: Hermetic glass seal and Category I bond prevent parameter drift under 175 °C sustained operation and mechanical shock. |
| Avionics Voltage Clamp | Radiation-Hardened Metrology |
Use Scenario: Overvoltage protection for 28 V aircraft bus interfaces subject to load dump transients. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping surge energy above 18 V threshold. Use Value: 1.5 W power rating and 11 Ω ZZT enable fast, repeatable clamping without thermal runaway. | Use Scenario: Precision voltage standard in portable calibration equipment used in nuclear facilities. IC Role / Device Role / Timing Role: Primary shunt reference in battery-powered metrology instruments. Use Value: Radiation hardness and 0.25 µA leakage preserve calibration integrity in high-dose gamma environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4471CUS/TR | ±2% tolerance (C suffix) vs. ±1% (D suffix); identical VZ, IZT, package, and qualification level | Suitable where tighter voltage accuracy is not required; lower cost for non-critical references | Select 1N4471CUS/TR when ±2% tolerance meets system spec and cost optimization is prioritized |
| 1N4471US/TR | ±5% tolerance (no suffix); otherwise identical electrical and mechanical specs and MIL-PRF-19500/406 qualification | Applicable in general-purpose regulation where wide tolerance is acceptable | Choose 1N4471US/TR for legacy designs or cost-sensitive industrial controls where 18 V ±5% suffices |
Compared with 1N4471CUS/TR and 1N4471US/TR, the 1N4471DUS/TR delivers the highest voltage accuracy (±1%) within the same military-qualified MELF platform-critical when reference stability directly impacts measurement repeatability or control loop gain.
Availability
1N4471DUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, downhole sensor reference, and avionics voltage clamp applications requiring stable component supply, full traceability, and long-term obsolescence management.
Supply support for 1N4471DUS/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, radiation-hardened, and military-qualified analog and mixed-signal components.
The 1N4471DUS/TR belongs to Microsemi's MIL-PRF-19500/406-qualified Zener diode family, engineered specifically for voltage regulation in mission-critical systems where failure is not an option-including space, defense, and energy exploration.
FAQ
What is the Zener voltage and test current for the 1N4471DUS/TR?
The 1N4471DUS/TR has a nominal Zener voltage of 18.0 V measured at a test current (IZT) of 14.0 mA. This value is guaranteed within ±1% tolerance due to the 'D' suffix, and appears in the Electrical Characteristics table on Page 3 of Microsemi's T4-LDS-0183-1 datasheet. The 1N4471DUS/TR maintains this regulation point across its full operating temperature range when properly heatsinked.
Is the 1N4471DUS/TR RoHS compliant?
The 1N4471DUS/TR is not RoHS compliant by default; RoHS-compliant versions (matte tin termination) are available only for commercial-grade variants, not for military-qualified parts like the JANTXV-level 1N4471DUS/TR. The standard termination is tin/lead (Sn/Pb), as confirmed in the Mechanical and Packaging section of the datasheet. Always verify compliance status with Aetrix Electronics for your specific order lot.
What does the 'D' in 1N4471DUS/TR signify?
The 'D' in 1N4471DUS/TR denotes ±1% Zener voltage tolerance, per Microsemi's Part Nomenclature table on Page 2 of T4-LDS-0183-1. This distinguishes it from the 'C' (±2%) and base (±5%) variants. The 'US' indicates D-5A MELF packaging, and '/TR' specifies tape-and-reel delivery. The 1N4471DUS/TR thus delivers the highest accuracy option in the 18 V MELF Zener family.
What is the maximum power dissipation and thermal resistance of the 1N4471DUS/TR?
The 1N4471DUS/TR has a steady-state power dissipation rating of 1.5 W at 25 °C ambient, with a junction-to-end-cap thermal resistance (RθJEC) of 20 °C/W. Derating is required above 25 °C per the curve in Figure 2. These values are defined in the Maximum Ratings table on Page 1 and apply directly to the 1N4471DUS/TR's D-5A MELF package with tungsten slugs and hermetic glass seal.
Does the 1N4471DUS/TR have radiation hardness certification?
Yes-the 1N4471DUS/TR is inherently radiation hard as documented in Microsemi MicroNote 050, referenced in the Applications/Benefits section of the datasheet. This characteristic stems from its hermetic voidless glass construction and Category I metallurgical bond, making the 1N4471DUS/TR suitable for low-earth orbit and nuclear instrumentation where total ionizing dose (TID) resilience is required.
1N4471DUS/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):
- 18 V
- Tolerance:
- ±1%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 11 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 14.4 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
1N4471DUS/TR FAQ
1.How can I place an order for 1N4471DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4471DUS/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 1N4471DUS/TR reliable?
The price and inventory of 1N4471DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4471DUS/TR is usually 5 days.
3.What payment methods are accepted for 1N4471DUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4471DUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4471DUS/TR?
1N4471DUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4471DUS/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 1N4471DUS/TR?
For technical support, including 1N4471DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4471DUS/TR requirements.
6.How does Aetrix verify that 1N4471DUS/TR is sourced from the original manufacturer or authorized distributors?
All 1N4471DUS/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 1N4471DUS/TR meets industry standards.
7.What is the process for return or replacement of 1N4471DUS/TR?
All 1N4471DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4471DUS/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 1N4471DUS/TR part is unused and in its original packaging.
Return procedure for 1N4471DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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