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Microchip Technology 1N4471DUS
- Part No.:
- 1N4471DUS
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, A
- Datasheet:
-
1N4471DUS.pdf
- Description:
- DIODE ZENER 18V 1.5W D5A
- Quantity:
- Payment:
- Shipping:
Inventory:3,511
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Product details
Overview
1N4471DUS 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 18.0 V at 14.0 mA test current, ±1% tolerance (denoted by suffix 'D'), and qualified to MIL-PRF-19500/406 at JANTXV level. It delivers stable voltage regulation in high-reliability aerospace and defense power supply monitoring circuits.
For engineers reviewing the 1N4471DUS datasheet, 1N4471DUS pinout, 1N4471DUS application, or 1N4471DUS equivalent, this page provides verified package dimensions, Zener impedance (11 Ω @ 14 mA), temperature coefficient behavior, junction-to-end-cap thermal resistance (20 °C/W), and military-grade qualification details critical for radiation-hardened or mission-critical designs.
Technical Context
This device operates as a precision shunt voltage regulator in reverse-biased breakdown mode, with a specified Zener knee current (IZK) of 0.05 mA and maximum dynamic impedance (ZZK) of 650 Ω near the knee. Its triple-layer passivation and Category I internal metallurgical bond ensure robustness under thermal cycling and mechanical stress.
The 1N4471DUS uses a D-5A MELF glass package with tungsten slugs and tin/lead terminations, enabling operation from –65 °C to +175 °C. Its non-ESD-sensitive construction complies with MIL-STD-750 Method 1020, and its inherent radiation hardness is documented in Microsemi MicroNote 050.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 18.0 V at IZT = 14.0 mA - defines regulated output voltage under standard test conditions |
| Zener Tolerance | ±1% - achieved via 'D' suffix; enables tight voltage reference accuracy in feedback loops |
| Power Dissipation (PD) | 1.5 W @ TA = 25 °C - sets maximum continuous power handling before thermal derating applies |
| Dynamic Impedance (ZZT) | 11 Ω @ IZT = 14.0 mA - low impedance ensures minimal output voltage variation under load transients |
| Junction Temperature Range | –65 °C to +175 °C - supports operation in extreme environmental conditions without derating |
| Thermal Resistance (RθJEC) | 20 °C/W - quantifies thermal path efficiency from junction to end cap for heatsink design |
| Maximum Reverse Current (IR) | 0.05 µA @ VR = 14.4 V - ultra-low leakage preserves regulation accuracy at near-Zener voltages |
Pinout & Package
The 1N4471DUS is a two-terminal Zener diode in the D-5A MELF (Metal Electrode Leadless Face) glass package. Cathode is marked by a single band on the glass body; anode is unmarked. No PCB pad layout deviation from standard D-5A footprint is required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener breakdown terminal | Connected to regulated voltage node; reverse bias establishes Zener conduction |
| Anode (unmarked end) | Reference return path | Typically tied to system ground or lower-potential rail to complete regulation loop |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and long-term parameter drift in humid or vacuum environments |
| Triple-layer passivation | Enhances surface stability and prevents contamination-induced leakage or premature breakdown |
| Category I metallurgical bond | Ensures mechanical integrity under shock/vibration up to MIL-STD-883 Method 2002 |
| JANTXV qualification per MIL-PRF-19500/406 | Validates performance across extended temperature, life test, and screening requirements for space-grade use |
| Inherent radiation hardness | Enables operation in total ionizing dose (TID) environments without external shielding per MicroNote 050 |
Applications
| Avionics Power Monitoring | Satellite DC-DC Converter Reference |
|---|---|
Use Scenario: Real-time monitoring of 28 V aircraft bus voltage during engine start transients. IC Role / Device Role / Timing Role: Shunt voltage reference in comparator-based overvoltage detection circuit. Use Value: ±1% tolerance and –65 °C to +175 °C operation ensure reliable trip-point accuracy across flight envelope. |
Use Scenario: Providing stable 18 V reference for error amplifier in radiation-tolerant isolated DC-DC converter. IC Role / Device Role / Timing Role: Precision Zener shunt regulator establishing feedback threshold. Use Value: Inherent radiation hardness and 11 Ω dynamic impedance minimize output drift under gamma exposure. |
| Military Radar Bias Supply | Undersea Sonar Signal Conditioning |
Use Scenario: Stabilizing gate bias voltage for GaN RF power amplifiers in pulsed radar transmitters. IC Role / Device Role / Timing Role: Low-noise voltage clamp protecting amplifier input stage during pulse edges. Use Value: 1.5 W power rating and 20 °C/W RθJEC support short-duration surge currents without thermal runaway. |
Use Scenario: Calibrating analog front-end gain stages in deep-ocean hydrophone arrays exposed to high-pressure, low-temperature seawater. IC Role / Device Role / Timing Role: Sealed reference element maintaining calibration integrity over 20-year deployment. Use Value: Hermetic glass construction prevents electrolytic corrosion and parametric shift in saline 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 | Same 18.0 V Zener voltage, but ±2% tolerance (suffix 'C') and JANTX qualification only | Lacks JANTXV screening; not approved for Class V space applications requiring burn-in and lot acceptance testing | Select when ±2% accuracy suffices and full JANTXV qualification is not mandated |
| 1N4471US | Same 18.0 V Zener voltage, ±5% tolerance (no suffix), JANTXV qualified | Higher voltage uncertainty increases risk of false trips in precision overvoltage protection circuits | Choose only for cost-sensitive legacy systems where tighter tolerance is unnecessary |
Compared with 1N4471CUS and 1N4471US, the 1N4471DUS uniquely combines ±1% tolerance with JANTXV-level screening-enabling use in closed-loop feedback references where both accuracy and reliability are simultaneously critical.
Availability
1N4471DUS is available at Aetrix Electronics and suitable for avionics power monitoring, satellite DC-DC converter reference, and military radar bias supply applications requiring stable component supply across extended product lifecycles.
Supply support for 1N4471DUS 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 components.
The 1N4471DUS belongs to Microsemi's MIL-PRF-19500/406-qualified Zener diode family, engineered specifically for voltage regulation in aerospace, defense, and nuclear instrumentation systems where failure is not an option.
FAQ
What is the Zener voltage tolerance of the 1N4471DUS?
The 1N4471DUS has a Zener voltage tolerance of ±1%, indicated by the 'D' suffix in its part number. This tolerance is verified at 25 °C case temperature with IZT = 14.0 mA, and supports precision voltage reference applications where tighter regulation is required than standard ±5% devices like the 1N4471US.
Is the 1N4471DUS RoHS compliant?
No, the 1N4471DUS is not RoHS compliant. It uses traditional tin/lead (Sn/Pb) terminations as specified in the datasheet, consistent with its JANTXV military qualification. RoHS-compliant versions are only available for commercial-grade variants (e.g., with 'e3' suffix), which are not offered for the 1N4471DUS.
What does the 'US' suffix mean in 1N4471DUS?
The 'US' suffix in 1N4471DUS denotes the D-5A MELF surface-mount package configuration. It distinguishes this variant from through-hole versions (e.g., 1N4471) and confirms compliance with the voidless hermetic glass construction and military screening levels defined in MIL-PRF-19500/406.
Can the 1N4471DUS be used in place of the 1N4471US?
The 1N4471DUS can replace the 1N4471US electrically and mechanically, as both share identical package (D-5A MELF), Zener voltage (18.0 V), and JANTXV qualification. However, the 1N4471DUS offers ±1% tolerance versus ±5%, making it suitable for higher-accuracy applications-but requires verification that tighter tolerance does not destabilize existing feedback loops.
What is the maximum surge current rating for the 1N4471DUS?
The 1N4471DUS has a non-repetitive peak Zener surge current (IZSM) rating of 0.79 A for an 8.3 ms square wave, as specified in the Electrical Characteristics table. This value is derived from its 1.5 W power rating and thermal time constant, and must be applied with appropriate series limiting resistance to avoid junction overheating.
1N4471DUS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, A
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for 1N4471DUS through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4471DUS 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 reliable?
The price and inventory of 1N4471DUS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4471DUS is usually 5 days.
3.What payment methods are accepted for 1N4471DUS?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4471DUS?
1N4471DUS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4471DUS 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?
For technical support, including 1N4471DUS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4471DUS requirements.
6.How does Aetrix verify that 1N4471DUS is sourced from the original manufacturer or authorized distributors?
All 1N4471DUS 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 meets industry standards.
7.What is the process for return or replacement of 1N4471DUS?
All 1N4471DUS units undergo pre-shipment inspection (PSI). If there is an issue with 1N4471DUS, 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 part is unused and in its original packaging.
Return procedure for 1N4471DUS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4471DUS Tags
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