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Microchip Technology 1N4703UR-1/TR
- Part No.:
- 1N4703UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4703UR-1/TR.pdf
- Description:
- DIODE ZENER 16V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,513
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Product details
Overview
1N4703UR-1 from Microsemi is a 500 mW surface-mount Zener diode in DO-213AA (SOD80/MLL34) MELF package, rated for 16.0 V nominal Zener voltage at 50 µA test current, ±5% tolerance, with 0.16 V regulation change between 10 µA and 100 µA. It operates across –65 °C to +175 °C and serves as a precision voltage reference in low-power analog monitoring circuits.
For engineers reviewing the 1N4703UR-1 datasheet, 1N4703UR-1 pinout, 1N4703UR-1 application, or 1N4703UR-1 equivalent, key selection criteria include its low 50 µA test current, hermetically sealed glass construction, minimal capacitance (<1.5 pF), radiation-hardened design per MicroNote 050, and MIL-PRF-19500 up-screening capability.
Technical Context
The 1N4703UR-1 implements a silicon Zener junction with metallurgically bonded metal slugs for high thermal reliability and low thermal resistance (100 °C/W junction-to-end cap). Its regulation behavior is defined at low-current operation (IZT = 50 µA), making it suitable for ultra-low-power biasing and reference applications where leakage and standby current matter.
It exhibits 0.16 V voltage regulation variation (∆VZ) over a decade of reverse current (10 µA to 100 µA), and maintains ≤0.05 µA reverse leakage at VR = 12.1 V. The device is polarity-marked with a cathode band and requires banded-end-positive biasing for Zener operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.0 V at IZT = 50 µA - stable reference point for low-current bias networks |
| Power Dissipation (PD) | 0.5 W - supports continuous operation up to 30.8 mA at 16 V without derating below 50 °C ambient |
| Voltage Tolerance | ±5% - enables use in non-critical regulation where cost and availability outweigh tight tolerance needs |
| Regulation Change (∆VZ) | 0.16 V (10 µA → 100 µA) - quantifies dynamic impedance impact on reference stability under varying load |
| Reverse Leakage (IR) | ≤0.05 µA at VR = 12.1 V - ensures negligible error current in high-impedance sensing paths |
| Junction Temp Range | –65 °C to +175 °C - validated for aerospace, downhole, and extended-temperature industrial environments |
| Package | DO-213AA (SOD80/MLL34) - hermetically sealed MELF glass body with tin-lead or matte-tin terminations |
Pinout & Package
DO-213AA (SOD80/MLL34) is a cylindrical, hermetically sealed glass MELF package with two axial end-cap terminals. Cathode is marked by a single dark band; device must be biased with banded end positive for Zener conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Low-side terminal during Zener operation | Connected to circuit ground or lower potential node; carries full Zener current when regulating |
| Cathode (banded end) | High-side terminal during Zener operation | Connected to supply rail or higher potential; voltage at this node is clamped to VZ = 16.0 V |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical die bonding | Eliminates wire bonds to improve thermal cycling endurance and long-term parameter stability |
| Hermetic glass sealing | Prevents moisture ingress and corrosion, enabling >20-year field life in harsh environments |
| Low 50 µA test current | Enables accurate voltage referencing in µA-level bias networks without loading error |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) per Microsemi MicroNote 050 - suitable for space-qualified designs |
| MIL-PRF-19500 up-screening | Available with screening levels MQ (JAN), MX (JANTX), MV (JANTXV), MSP (JANS) for military/aerospace use |
Applications
| Industrial Sensor Signal Conditioning | Aerospace Power Monitor Reference |
|---|---|
Use Scenario: Precision scaling of thermocouple or RTD output into ADC input range under wide temperature swings. IC Role / Device Role / Timing Role: Zener voltage reference establishing stable 16.0 V rail for op-amp bias and gain-setting networks. Use Value: Low ∆VZ (0.16 V) and wide TJ range (–65 °C to +175 °C) maintain reference accuracy across environmental extremes. |
Use Scenario: Monitoring bus voltage in satellite power distribution units where radiation tolerance is mandatory. IC Role / Device Role / Timing Role: Radiation-hardened Zener clamp protecting comparator inputs from overvoltage transients. Use Value: Inherent TID hardness per MicroNote 050 eliminates need for shielding or redundant protection schemes. |
| Downhole Oilfield Instrumentation | Medical Implantable Device Biasing |
Use Scenario: Providing stable bias for pressure transducers operating at 150 °C in drilling mud pulse telemetry systems. IC Role / Device Role / Timing Role: High-temperature-stable Zener reference for analog front-end calibration. Use Value: Verified operation up to +175 °C junction temperature with no parametric shift beyond spec limits. |
Use Scenario: Generating ultra-low-noise, low-current bias for neural signal amplifiers in closed-loop neurostimulators. IC Role / Device Role / Timing Role: Low-leakage (≤0.05 µA) Zener reference minimizing quiescent current draw from battery. Use Value: 50 µA test current and sub-picoamp leakage enable multi-year battery life without sacrificing reference fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C16 | 300 mW SOT-23 package; 16 V ±5%; IZT = 5 mA; higher leakage (≤100 nA @ 12.2 V) | Suitable for PCB-space-constrained consumer designs but not high-reliability or high-temp environments | Select when cost and footprint are prioritized over hermeticity, radiation hardness, or extended temperature range |
| 1N4744A | 1 W through-hole DO-41; 15 V ±5%; IZT = 25 mA; larger package, no MIL screening option | Used in legacy industrial power supplies where board real estate and serviceability outweigh miniaturization needs | Select only if existing DO-41 footprint is fixed and higher power margin is required; not drop-in compatible |
Compared with BZX84-C16 and 1N4744A, the 1N4703UR-1 uniquely combines hermetic MELF packaging, radiation hardness, ultra-low test current, and MIL-PRF-19500 screening readiness - making it the only choice for mission-critical, high-temperature, or radiation-exposed Zener reference roles.
Availability
1N4703UR-1 is available at Aetrix Electronics and suitable for industrial sensor conditioning, aerospace power monitoring, downhole instrumentation, and medical implantable device biasing requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4703UR-1 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 high-temperature analog and mixed-signal components.
The 1N4703UR-1 belongs to Microsemi's legacy DO-213AA Zener series designed specifically for defense, aerospace, oilfield, and medical applications demanding hermeticity, long-term stability, and extreme environmental resilience.
FAQ
What is the Zener voltage and test current for the 1N4703UR-1?
The 1N4703UR-1 has a nominal Zener voltage of 16.0 V measured at a test current (IZT) of 50 µA. This low test current enables accurate voltage referencing in ultra-low-power circuits without introducing significant loading error, and is specified per JEDEC standards for the 1N4678UR-1 through 1N4717UR-1 family.
Is the 1N4703UR-1 RoHS compliant?
Yes, the 1N4703UR-1 is available in RoHS-compliant versions (marked with "e3" suffix) for commercial-grade applications. RoHS compliance applies only to commercial versions; MIL-spec screened variants (MQ, MX, MV, MSP) retain tin-lead terminations per military requirements.
What package type does the 1N4703UR-1 use, and how is polarity identified?
The 1N4703UR-1 uses the DO-213AA (SOD80/MLL34) MELF glass package. Polarity is indicated by a single cathode band on the glass body; the banded end is the cathode and must be held at a higher potential than the unbanded anode end for Zener regulation.
Can the 1N4703UR-1 be used in radiation-intensive environments?
Yes, the 1N4703UR-1 is inherently radiation-hardened per Microsemi MicroNote 050, with demonstrated tolerance to total ionizing dose (TID) levels relevant to low-earth orbit and nuclear instrumentation applications - no additional shielding or derating is required for standard space-grade use.
What is the maximum steady-state power dissipation for the 1N4703UR-1?
The 1N4703UR-1 has a rated steady-state power dissipation of 0.5 W. This rating applies at end-cap temperature (TEC) < 125 °C or ambient temperature (TA) < 50 °C when mounted on FR4 with 1 oz copper and the recommended footprint per Microsemi's package drawing.
1N4703UR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 16 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 50 nA @ 12.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 100 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N4703UR-1/TR FAQ
1.How can I place an order for 1N4703UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4703UR-1/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 1N4703UR-1/TR reliable?
The price and inventory of 1N4703UR-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4703UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4703UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4703UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4703UR-1/TR?
1N4703UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4703UR-1/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 1N4703UR-1/TR?
For technical support, including 1N4703UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4703UR-1/TR requirements.
6.How does Aetrix verify that 1N4703UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4703UR-1/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 1N4703UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4703UR-1/TR?
All 1N4703UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4703UR-1/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 1N4703UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4703UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4703UR-1/TR Tags
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