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Microchip Technology 1N4740UR-1/TR
- Part No.:
- 1N4740UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4740UR-1/TR.pdf
- Description:
- DIODE ZENER 10V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,927
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Product details
Overview
1N4740UR-1/TR from Microsemi is a surface-mount 1.0 W glass Zener diode with nominal Zener voltage 10 V ±5%, 25 mA test current, 7 Ω dynamic impedance at IZT, 10 μA maximum reverse leakage at 7.6 V, and operating temperature range −65 °C to +175 °C - used for precision voltage regulation in power supply feedback loops and reference circuits.
For engineers reviewing the 1N4740UR-1/TR datasheet, 1N4740UR-1/TR pinout, 1N4740UR-1/TR application, or 1N4740UR-1/TR equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (130 °C/W on FR4), surge current rating (454 mA), hermetic DO-213AB MELF package, and RoHS-compliant e3 plating.
Technical Context
This device operates as a two-terminal voltage reference diode in reverse breakdown mode, delivering stable 10 V regulation across 0.25 mA to 454 mA DC current range. Its glass hermetic DO-213AB MELF construction ensures low parasitic capacitance and radiation hardness per MicroNote 050.
It exhibits a sharp Zener knee with 7 Ω dynamic impedance at 25 mA and 400 mV maximum forward voltage at 200 mA. Thermal derating follows linear 130 °C/W junction-to-ambient path on standard FR4 PCB with recommended footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10 V ±5% at 25 mA - defines regulated output voltage with tight tolerance for feedback accuracy |
| Power Dissipation | 1.0 W at TEC < 125 °C - supports continuous regulation without forced cooling in compact layouts |
| Dynamic Impedance (ZZT) | 7 Ω at IZT = 25 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage Current | 10 μA max at VR = 7.6 V - guarantees low quiescent error in high-impedance reference nodes |
| Thermal Resistance | 130 °C/W junction-to-ambient on FR4 - informs heatsinking requirements and board layout spacing |
| Surge Current (IS) | 454 mA (½-sine, 1/120 s) - withstands short-term overvoltage events in unregulated input stages |
| Operating Temperature | −65 °C to +175 °C - enables deployment in automotive engine compartments and industrial control enclosures |
Pinout & Package
Package: Hermetically sealed DO-213AB glass MELF case with cathode band marking; leadless surface-mount design optimized for high-density PCB assembly and low parasitic inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse-biased during regulation |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to voltage source input; delivers stable 10 V to load or feedback network |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Enables operation up to +175 °C and intrinsic radiation hardness per MicroNote 050 |
| Low dynamic impedance (7 Ω) | Maintains <±10 mV output shift across 10–100% load current in feedback regulator applications |
| RoHS-compliant e3 plating | Matte-tin termination compatible with Pb-free reflow (260 °C/10 s) and legacy SnPb processes |
| Tape-and-reel packaging (TR) | 12 mm tape, 1500 units/reel - supports automated SMT placement without manual handling |
| JEDEC DO-213AB outline compliance | Ensures mechanical compatibility with standard MELF pick-and-place nozzles and reflow profiles |
Applications
| Switching Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in flyback or buck converter feedback loop using optocoupler-coupled TL431 alternative. IC Role / Device Role / Timing Role: Zener diode provides fixed 10 V reference for error amplifier bias and threshold setting. Use Value: ±5% tolerance and 7 Ω impedance ensure <±1.5% output voltage stability across line/load/temperature. |
Use Scenario: Supplies stable excitation voltage to bridge-based pressure or strain sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Functions as precision shunt reference for ratiometric ADC front-end biasing. Use Value: −65 °C to +175 °C operation and hermetic seal prevent drift in harsh factory-floor environments. |
| Automotive ECU Voltage Clamp | High-Reliability Backup Reference |
Use Scenario: Clamps transient spikes on 12 V rail in engine control unit power distribution networks. IC Role / Device Role / Timing Role: Shunt protector activated during load-dump or ISO 7637-2 pulse 5a events. Use Value: 454 mA surge rating and 130 °C/W thermal resistance enable single-device clamping without external heatsink. |
Use Scenario: Provides fail-safe backup reference when primary digital voltage reference fails in avionics monitoring systems. IC Role / Device Role / Timing Role: Standby shunt regulator maintaining 10 V node for watchdog timer and brown-out detection. Use Value: Radiation-hardened glass MELF construction ensures functional integrity under total ionizing dose exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740AUR | Same 10 V ±5%, DO-213AB package, but no TR tape-and-reel suffix - supplied in bulk or different reel configuration | Lacks standardized 1500-unit tape-and-reel; requires manual loading or custom packaging integration | Select 1N4740UR-1/TR when automated SMT production demands verified reel compatibility and traceable lot control |
| SMAJ4740A | Same 10 V ±5% Zener voltage but in SMA package (DO-214AC); higher thermal resistance (150 °C/W), lower surge rating (300 mA) | Less suitable for high-temp or high-surge environments; better for cost-sensitive consumer PCBs with lower reliability requirements | Choose SMAJ4740A only if DO-213AB footprint is unavailable and thermal/surge margins exceed 20% design headroom |
Compared with 1N4740AUR and SMAJ4740A, the 1N4740UR-1/TR uniquely combines JEDEC DO-213AB mechanical compliance, RoHS e3 plating, TR tape-and-reel logistics, and full −65 °C to +175 °C qualification - making it optimal for high-reliability automated manufacturing where thermal robustness and supply chain traceability are critical.
Availability
1N4740UR-1/TR is available at Aetrix Electronics and suitable for switching power supplies, industrial sensor interfaces, automotive ECUs, and high-reliability backup references requiring stable component supply with full traceability and extended temperature support.
Supply support for 1N4740UR-1/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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets, emphasizing radiation tolerance and extreme temperature performance.
The 1N4740UR-1/TR belongs to Microsemi's surface-mount glass Zener diode family engineered for voltage regulation in mission-critical systems where hermetic sealing, wide temperature operation, and surge resilience are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N4740UR-1/TR?
The 1N4740UR-1/TR has a nominal Zener voltage of 10 V with a tolerance of ±5%, as indicated by the "A" suffix in its designation. This tolerance is specified at 25 mA test current and 30 °C case temperature, ensuring predictable regulation accuracy in feedback and reference applications.
Does the 1N4740UR-1/TR meet RoHS requirements?
Yes, the 1N4740UR-1/TR is RoHS compliant, confirmed by the "e3" suffix in its full part number. It features annealed matte-tin plating per MIL-STD-750 Method 2026, qualified for both Pb-free reflow (260 °C for 10 seconds) and traditional SnPb soldering processes.
What package type does the 1N4740UR-1/TR use?
The 1N4740UR-1/TR uses the DO-213AB glass MELF package - a hermetically sealed, leadless cylindrical surface-mount outline standardized by JEDEC. Its dimensions are 2.39–2.66 mm diameter and 4.80–5.20 mm length, with cathode polarity marked by a single band.
Can the 1N4740UR-1/TR replace through-hole 1N4740A diodes?
No direct replacement: the 1N4740UR-1/TR is a surface-mount DO-213AB MELF device, while the 1N4740A is axial-leaded DO-41. They share identical electrical specs but differ mechanically - PCB redesign and reflow process validation are required to substitute 1N4740UR-1/TR for 1N4740A.
What is the maximum steady-state power dissipation for the 1N4740UR-1/TR?
The 1N4740UR-1/TR is rated for 1.00 W steady-state power dissipation at end-cap temperature below 125 °C or ambient temperature below 45 °C on FR4 with recommended footprint. Derating is linear above these temperatures, reaching zero power at 175 °C ambient per the published curve in Figure 1.
1N4740UR-1/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):
- 10 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 7.6 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)
1N4740UR-1/TR FAQ
1.How can I place an order for 1N4740UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4740UR-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 1N4740UR-1/TR reliable?
The price and inventory of 1N4740UR-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 1N4740UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4740UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4740UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4740UR-1/TR?
1N4740UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4740UR-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 1N4740UR-1/TR?
For technical support, including 1N4740UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4740UR-1/TR requirements.
6.How does Aetrix verify that 1N4740UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4740UR-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 1N4740UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4740UR-1/TR?
All 1N4740UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4740UR-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 1N4740UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4740UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4740UR-1/TR Tags
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MMBZ5240B-7-F
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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onsemi
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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