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Microchip Technology 1N4730AUR/TR
- Part No.:
- 1N4730AUR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4730AUR/TR.pdf
- Description:
- DIODE ZENER 3.9V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,602
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Product details
Overview
1N4730AUR/TR from Microsemi is a surface-mount 1.0 W glass-encapsulated Zener diode with 3.9 V nominal Zener voltage, ±5% tolerance (A-suffix), 64 mA test current, 9 Ω dynamic impedance at IZT, and 50 μA maximum reverse leakage at 1 V. It operates from –65°C to +175°C and regulates voltage in low-parasitic, high-density power supply rails.
For engineers reviewing the 1N4730AUR/TR datasheet, 1N4730AUR/TR pinout, 1N4730AUR/TR application, or 1N4730AUR/TR equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (130°C/W on FR4), surge current rating (1190 mA), hermetic glass MELF package reliability, and RoHS-compliant e3 suffix availability.
Technical Context
This device implements a single-junction, silicon planar Zener structure optimized for stable voltage regulation under varying load and temperature. Its DO-213AB glass MELF package provides hermetic sealing and low parasitic capacitance-critical for noise-sensitive analog references and precision biasing.
The 1N4730AUR/TR delivers regulated 3.9 V output across 1.0 mA to 1190 mA operating current range, with sharp knee characteristics verified by dual-point Zener impedance measurement (IZK and IZT). It supports steady-state dissipation of 1.0 W up to 125°C end-cap temperature or 45°C ambient on standard FR4 PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V ±5% - defines precise reference level for feedback loops and voltage clamping |
| Test Current (IZT) | 64 mA - operating point where VZ and dynamic impedance are specified |
| Dynamic Impedance (ZZT) | 9 Ω @ IZT - low AC impedance ensures minimal regulation error under dynamic load changes |
| Max Reverse Leakage (IR) | 50 μA @ 1 V - guarantees low standby power loss in always-on circuits |
| Power Dissipation | 1.0 W @ TEC ≤ 125°C - enables compact layout without forced cooling in industrial environments |
| Operating Temperature | –65°C to +175°C - supports deployment in automotive engine bays and downhole electronics |
| Thermal Resistance | 130°C/W junction-to-ambient (FR4, 1 oz Cu) - informs heatsinking requirements for sustained full-power operation |
Pinout & Package
Package: DO-213AB glass MELF (hermetically sealed, leadless cylindrical surface-mount package with cathode band marking).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during Zener operation; must be negative relative to cathode |
| Cathode | Zener regulation terminal | Banded end; connected to higher-potential node; establishes 3.9 V reference to anode |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift in harsh environments |
| Nonsensitive to ESD | Withstands human-body-model discharges without degradation-no external protection required |
| Specified capacitance | Low, stable junction capacitance (see Figure 2) enables use in RF bias and timing circuits |
| Inherent radiation hardness | Validated per MicroNote 050-suitable for space-qualified and nuclear instrumentation applications |
| RoHS-compliant e3 option | Tin-plated terminals meet JEDEC J-STD-609A Class 1 moisture sensitivity and lead-free assembly standards |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 3.9 V reference for linear regulator feedback or ADC reference buffer. IC Role / Device Role / Timing Role: Precision voltage reference element in analog signal chains. Use Value: ±5% tolerance and 9 Ω ZZT ensure <10 mV regulation error across 1–100 mA load variation. |
Use Scenario: Protecting microcontroller I/O pins from transient voltage spikes on 5 V bus lines. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage to 3.9 V + forward drop. Use Value: 1190 mA surge rating absorbs 8/20 μs transients without failure per IEC 61000-4-5 Level 3. |
| Temperature-Stable Bias | High-Reliability Sensor Excitation |
Use Scenario: Generating fixed bias for op-amp input stages in industrial sensor front-ends. IC Role / Device Role / Timing Role: Low-drift DC bias source compensating for amplifier offset drift. Use Value: –65°C to +175°C operating range maintains regulation stability across thermal cycling in motor control enclosures. |
Use Scenario: Supplying excitation voltage to strain gauge bridges in aerospace structural monitoring systems. IC Role / Device Role / Timing Role: Hermetic voltage reference ensuring calibration integrity over 20+ year service life. Use Value: Glass MELF packaging and radiation hardness prevent parametric shift in mission-critical flight hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4730A-T | Same 3.9 V ±5%, but in DO-41 axial package; higher thermal resistance (50°C/W junction-to-lead) | Requires through-hole mounting and larger board area; less suitable for high-density SMT designs | Select when legacy through-hole assembly or manual prototyping is required |
| SMAJ4730A | Same electrical specs, but in SMA package; 1.5× larger footprint; 1000 mA surge rating vs. 1190 mA | Lower power density; reduced thermal performance on FR4 (150°C/W typical) | Choose if existing SMA land pattern reuse is prioritized over optimal thermal efficiency |
Compared with 1N4730A-T and SMAJ4730A, the 1N4730AUR/TR offers superior thermal performance in compact SMT layouts due to its DO-213AB glass MELF package, enabling higher sustained power delivery and extended lifetime in thermally constrained embedded systems.
Availability
1N4730AUR/TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and medical sensor interfaces requiring stable component supply, long-lifecycle support, and hermetic reliability.
Supply support for 1N4730AUR/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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and precision analog components for aerospace, defense, and industrial markets.
The 1N4730AUR/TR belongs to Microsemi's surface-mount Zener diode family designed for high-density voltage regulation where hermetic sealing, wide temperature operation, and low parasitics are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N4730AUR/TR?
The 1N4730AUR/TR has a nominal Zener voltage of 3.9 V with a tolerance of ±5%, indicated by the "A" suffix in the part number. This tolerance is guaranteed over the full operating temperature range of –65°C to +175°C and applies at the specified test current of 64 mA.
Does the 1N4730AUR/TR require external heat sinking?
No, the 1N4730AUR/TR is rated for 1.0 W dissipation without external heat sinking when mounted on FR4 PCB with recommended pad layout. Its thermal resistance is 130°C/W junction-to-ambient, so at 45°C ambient it can sustain full power; derating is required above that temperature per Figure 1.
Is the 1N4730AUR/TR RoHS compliant?
Yes-the "e3" suffix in the full ordering designation (e.g., 1N4730AUR/TR-e3) indicates RoHS compliance with annealed matte-tin plating per JEDEC J-STD-609A. Standard production units are RoHS-compliant unless otherwise specified.
How is polarity identified on the 1N4730AUR/TR?
The 1N4730AUR/TR uses a cathode band marking on the glass MELF body. During Zener operation, the banded end (cathode) must be held at a higher potential than the unmarked end (anode) to achieve 3.9 V regulation. Forward voltage is ≤1.2 V at 200 mA.
What is the maximum surge current rating for the 1N4730AUR/TR?
The 1N4730AUR/TR has a maximum non-repetitive surge current (IS) of 1190 mA, measured using a ½ sine-wave pulse of 1/120 second duration at 25°C ambient. This rating supports robust transient suppression in power rail protection applications.
1N4730AUR/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF (Glass)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 9 Ohms
- Current - Reverse Leakage @ Vr:
- 50 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB (MELF, LL41)
1N4730AUR/TR FAQ
1.How can I place an order for 1N4730AUR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4730AUR/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 1N4730AUR/TR reliable?
The price and inventory of 1N4730AUR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4730AUR/TR is usually 5 days.
3.What payment methods are accepted for 1N4730AUR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4730AUR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4730AUR/TR?
1N4730AUR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4730AUR/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 1N4730AUR/TR?
For technical support, including 1N4730AUR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4730AUR/TR requirements.
6.How does Aetrix verify that 1N4730AUR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4730AUR/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 1N4730AUR/TR meets industry standards.
7.What is the process for return or replacement of 1N4730AUR/TR?
All 1N4730AUR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4730AUR/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 1N4730AUR/TR part is unused and in its original packaging.
Return procedure for 1N4730AUR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4730AUR/TR Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MM5Z5V1ST1G
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