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Microchip Technology 1N4741UR-1/TR
- Part No.:
- 1N4741UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4741UR-1/TR.pdf
- Description:
- DIODE ZENER 11V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,477
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Product details
Overview
1N4741UR-1/TR from Microsemi is a surface-mount 1.0 W glass Zener diode with a nominal Zener voltage of 11 V, ±5% tolerance (A-suffix), 8 Ω dynamic impedance at 23 mA test current, and maximum reverse leakage of 5 μA at 8.4 V. It operates across –65 °C to +175 °C and is used for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation.
For engineers reviewing the 1N4741UR-1/TR datasheet, 1N4741UR-1/TR pinout, 1N4741UR-1/TR application, or 1N4741UR-1/TR equivalent, key selection criteria include its DO-213AB MELF glass package, hermetic sealing, low parasitic capacitance, radiation-hardened performance per MicroNote 050, and compatibility with high-density PCB layouts requiring stable regulation under thermal stress.
Technical Context
This Zener diode functions as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse current above its specified breakdown threshold. Its operation relies on controlled avalanche breakdown in doped silicon, with sharp knee characteristics verified via dual-point Zener impedance measurement per Note 2.
The device exhibits inherent radiation hardness and low ESD sensitivity due to its hermetically sealed glass MELF construction. Thermal resistance is 50 °C/W junction-to-end-cap and 130 °C/W junction-to-ambient on FR4 (1 oz Cu) with recommended pad layout - critical for sustained 1.0 W dissipation at elevated ambient temperatures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11 V ±5% at 23 mA - defines regulated output level in feedback networks and clamping thresholds |
| Power Dissipation | 1.0 W at TEC < 125 °C - supports continuous regulation without forced cooling in compact designs |
| Dynamic Impedance (ZZT) | 8 Ω at IZT = 23 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage Current | 5 μA max at VR = 8.4 V - guarantees low quiescent error in precision reference applications |
| Operating Temperature | –65 °C to +175 °C - enables use in aerospace, downhole, and industrial environments |
| Thermal Resistance | 130 °C/W junction-to-ambient on FR4 - informs heatsinking requirements and derating curves |
| Forward Voltage | 1.2 V max at 200 mA - relevant for polarity-checking and forward-bias protection circuits |
Pinout & Package
Package: DO-213AB glass MELF (hermetically sealed, leadless cylindrical surface-mount package). Cathode indicated by single black band; device must be mounted with banded end positive relative to opposite end for Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection point | Connected to regulated output node; reverse-biased during regulation |
| Anode (unbanded end) | Zener cathode connection point | Connected to ground or lower-potential rail; completes shunt path |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Enables operation in high-reliability, high-humidity, and radiation-exposed environments per MicroNote 050 |
| Low dynamic impedance (8 Ω) | Minimizes output voltage deviation under varying load currents in feedback regulation |
| Specified capacitance (see Figure 2) | Supports stable high-frequency performance in switching regulator feedback paths |
| Nonsensitive to ESD | Eliminates need for external ESD protection in board-level handling and assembly |
| RoHS-compliant (e3 suffix) | Meets environmental compliance requirements without sacrificing electrical or thermal performance |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback loops using optocoupler-coupled secondary-side sensing. IC Role / Device Role / Timing Role: Shunt reference element providing precise 11 V threshold to TL431-like control ICs or comparator inputs. Use Value: Maintains ±1% output accuracy over temperature and line/load variations due to tight 5% tolerance and low ZZT. |
Use Scenario: Clamps transient overvoltage spikes on DC bus lines in motor drives or industrial PLC I/O modules. IC Role / Device Role / Timing Role: Passive crowbar element diverting surge current away from sensitive downstream circuitry. Use Value: Withstands 1.0 W surges up to 1000 mA peak (IS) and operates reliably from –65 °C to +175 °C. |
| High-Reliability Reference Source | Aerospace Voltage Monitor |
Use Scenario: Provides stable 11 V reference for ADC biasing or DAC output scaling in avionics sensor signal conditioning. IC Role / Device Role / Timing Role: Precision shunt reference replacing bulkier IC-based references where size and radiation tolerance are critical. Use Value: Hermetic glass seal and radiation hardness per MicroNote 050 ensure long-term stability in mission-critical systems. |
Use Scenario: Monitors auxiliary rail voltage in satellite power distribution units, triggering fault logic if voltage exceeds 11.55 V. IC Role / Device Role / Timing Role: Threshold detector enabling fail-safe shutdown before downstream component damage occurs. Use Value: Guaranteed 11 V ±5% tolerance and <5 μA leakage at 8.4 V ensure accurate trip-point definition over full temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4741A-TR | Same 11 V ±5%, DO-41 axial package (not surface-mount); higher thermal resistance (150 °C/W) | Requires through-hole mounting and larger board area; less suitable for high-density or automated SMT lines | Select when legacy through-hole design or manual prototyping is required |
| SMAJ4741A | Same 11 V ±5%, but in SMA package; 1.5 W peak power rating; higher capacitance (~100 pF vs ~50 pF) | Better surge handling but introduces more noise coupling in high-speed feedback paths | Select when enhanced surge immunity is prioritized over low-noise regulation |
Compared with 1N4741UR-1/TR, the 1N4741A-TR offers identical regulation specs but lacks surface-mount compatibility and thermal efficiency, while the SMAJ4741A trades lower parasitic capacitance for higher surge capability - making the 1N4741UR-1/TR optimal for space-constrained, low-noise, high-reliability SMT applications.
Availability
1N4741UR-1/TR is available at Aetrix Electronics and suitable for switching power supply feedback, overvoltage protection clamp, and high-reliability reference source applications requiring stable component supply, RoHS compliance, and extended temperature operation.
Supply support for 1N4741UR-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) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N4741UR-1/TR belongs to Microsemi's surface-mount Zener diode family designed specifically for high-density, low-parasitic, radiation-tolerant voltage regulation in mission-critical systems.
FAQ
What is the Zener voltage tolerance of the 1N4741UR-1/TR?
The 1N4741UR-1/TR has a nominal Zener voltage of 11 V with a tolerance of ±5%, denoted by the "A" suffix in its designation. This tolerance is guaranteed over the full operating temperature range of –65 °C to +175 °C and applies under standard test conditions (23 mA Zener test current, 90-second stabilization per Note 4).
Is the 1N4741UR-1/TR suitable for high-temperature industrial applications?
Yes, the 1N4741UR-1/TR is rated for continuous operation from –65 °C to +175 °C and features a thermal resistance of 130 °C/W junction-to-ambient on FR4. Its hermetic glass MELF package ensures reliability in thermal cycling environments typical of oil & gas, automotive under-hood, and industrial motor control systems.
Does the 1N4741UR-1/TR require external ESD protection?
No - the 1N4741UR-1/TR is explicitly characterized as nonsensitive to ESD per its datasheet. Its glass MELF construction and internal structure eliminate the need for additional board-level ESD protection, simplifying layout and reducing BOM count in sensitive analog signal paths.
How does the DO-213AB package of the 1N4741UR-1/TR compare to DO-41 in thermal performance?
The DO-213AB package of the 1N4741UR-1/TR delivers superior thermal performance versus DO-41: junction-to-end-cap thermal resistance is 50 °C/W (vs ~100 °C/W for DO-41), and it supports 1.0 W dissipation at lower case temperatures. This enables higher power density and better reliability in thermally constrained SMT designs.
Can the 1N4741UR-1/TR be used as a replacement for the 1N4741A in existing designs?
The 1N4741UR-1/TR provides identical electrical specifications (11 V ±5%, 8 Ω ZZT, 1.0 W) but differs mechanically: it uses the surface-mount DO-213AB MELF package instead of the axial DO-41. Direct substitution requires PCB footprint redesign and requalification of thermal performance, though functional behavior remains consistent.
1N4741UR-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):
- 11 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 8.4 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)
1N4741UR-1/TR FAQ
1.How can I place an order for 1N4741UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4741UR-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 1N4741UR-1/TR reliable?
The price and inventory of 1N4741UR-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 1N4741UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4741UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4741UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4741UR-1/TR?
1N4741UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4741UR-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 1N4741UR-1/TR?
For technical support, including 1N4741UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4741UR-1/TR requirements.
6.How does Aetrix verify that 1N4741UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4741UR-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 1N4741UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4741UR-1/TR?
All 1N4741UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4741UR-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 1N4741UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4741UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4741UR-1/TR Tags
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