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Microchip Technology 1N4741AUR/TR
- Part No.:
- 1N4741AUR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4741AUR/TR.pdf
- Description:
- DIODE ZENER 11V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,200
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Product details
Overview
1N4741AUR/TR from Microsemi is a surface-mount 1.0 W glass-encapsulated Zener diode with a nominal Zener voltage of 11 V ±5%, 23 mA test current, 8 Ω dynamic impedance at IZT, and maximum reverse current of 5 μA at 8.4 V. It operates from −65 °C to +175 °C and is used for precision voltage regulation in high-density power supply feedback loops and reference circuits.
For engineers reviewing the 1N4741AUR/TR datasheet, 1N4741AUR/TR pinout, 1N4741AUR/TR application, or 1N4741AUR/TR equivalent, this page delivers verified electrical specs, DO-213AB package details, thermal derating behavior, Zener knee characteristics, and validated alternative parts for voltage reference design and replacement sourcing.
Technical Context
The 1N4741AUR/TR functions as a two-terminal voltage reference device operating in reverse breakdown mode. Its Zener voltage is specified at 30 °C with 90-second stabilization, and its dynamic impedance (8 Ω) is measured with 10% RMS AC superimposed on 23 mA DC test current - ensuring stable regulation under varying load conditions.
It features hermetic glass MELF construction (DO-213AB), enabling operation up to +175 °C junction temperature and intrinsic radiation hardness per MicroNote 050. Thermal resistance is 130 °C/W junction-to-ambient on FR4 with recommended pad layout, supporting reliable 1.0 W dissipation at TA ≤ 45 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11 V ±5% at 23 mA - defines regulated output voltage tolerance for feedback networks |
| Power Dissipation | 1.0 W at TEC < 125 °C - supports continuous regulation in compact layouts without forced cooling |
| Dynamic Impedance (ZZT) | 8 Ω at IZT = 23 mA - ensures low output voltage variation under load transients |
| Reverse Current (IR) | 5 μA max at VR = 8.4 V - guarantees minimal leakage in high-impedance reference paths |
| Operating Temperature | −65 °C to +175 °C - enables use in aerospace, downhole, and industrial environments |
| Forward Voltage | 1.2 V max at 200 mA - allows safe forward-bias testing without damage |
| Thermal Resistance | 130 °C/W junction-to-ambient on FR4 - informs PCB copper area requirements for thermal management |
Pinout & Package
Package: DO-213AB glass MELF - hermetically sealed, leadless cylindrical surface-mount package with cathode band marking. Dimensions: A = 2.39–2.66 mm (diameter), B = 4.80–5.20 mm (length), C = 0.41–0.55 mm (band width). Mounting uses standard EIA-481-B 12 mm tape, 1500/reel (TR suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection point in reverse-bias configuration | Must be held positive relative to anode for regulation; band identifies polarity during placement |
| Anode (unbanded end) | Zener cathode connection point in reverse-bias configuration | Connected to circuit ground or lower potential node; forms reference return path |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Enables operation at +175 °C and provides intrinsic radiation hardness per MicroNote 050 |
| ±5% Zener voltage tolerance (A suffix) | Reduces calibration overhead in mid-precision voltage references without trimming |
| Low dynamic impedance (8 Ω) | Maintains regulation stability across load changes in switching regulator feedback paths |
| Nonsensitive to ESD | Eliminates need for external protection in handling and assembly for automated SMT lines |
| RoHS-compliant (e3 suffix) | Meets environmental compliance requirements for industrial and medical end equipment |
Applications
| Switching Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates error amplifier input in isolated flyback or forward converter feedback networks. IC Role / Device Role / Timing Role: Provides stable 11 V reference for optocoupler-driven primary-side control. Use Value: Maintains ±1% output accuracy over −40 °C to +85 °C ambient due to low tempco and 8 Ω ZZT. |
Use Scenario: Supplies excitation voltage to bridge-based pressure/temperature transducers. IC Role / Device Role / Timing Role: Acts as low-drift, low-noise analog reference in signal conditioning front-ends. Use Value: Delivers <5 μA leakage at 8.4 V, minimizing offset error in high-impedance Wheatstone bridges. |
| Aerospace Power Monitoring | Downhole Instrumentation |
Use Scenario: Serves as overvoltage clamp and reference in avionics DC bus supervisors. IC Role / Device Role / Timing Role: Zener clamps transient spikes while providing stable 11 V for comparator thresholds. Use Value: Survives −65 °C to +175 °C and exhibits radiation hardness per MicroNote 050. |
Use Scenario: Provides bias voltage for MEMS accelerometers and piezoresistive sensors in oil/gas well logging tools. IC Role / Device Role / Timing Role: Functions as ruggedized voltage reference in sealed, high-pressure sensor modules. Use Value: Hermetic glass seal prevents moisture ingress and maintains regulation integrity at 200 °C junction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4741A | Same Zener voltage (11 V), ±5%, but in axial DO-41 package - larger footprint, higher thermal resistance (150 °C/W) | Preferred for through-hole prototyping or legacy board rework where SMT is not feasible | Select when manual assembly, higher surge current margin (1380 mA vs. 414 mA), or DO-41 compatibility required |
| BZX84-C11 | SOT-23 package, 11 V ±5%, 300 mW rating, 20 Ω ZZT - lower power, higher impedance, plastic body | Suitable for low-power portable electronics where size and cost outweigh thermal/radiation demands | Choose only for battery-powered consumer devices; avoid in high-temp, high-reliability, or high-stability designs |
Compared with 1N4741AUR/TR, the 1N4741A offers mechanical robustness and higher surge capability but sacrifices board density and thermal performance, while the BZX84-C11 trades reliability and regulation precision for miniaturization and cost - making the 1N4741AUR/TR optimal for high-density, high-temperature, and mission-critical voltage reference roles.
Availability
1N4741AUR/TR is available at Aetrix Electronics and suitable for switching power supplies, industrial sensor interfaces, aerospace monitoring systems, and downhole instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N4741AUR/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, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N4741AUR/TR belongs to Microsemi's surface-mount Zener diode family designed for high-density, high-temperature voltage regulation and reference applications where hermetic sealing and wide operating range are critical.
FAQ
What is the Zener voltage tolerance of the 1N4741AUR/TR?
The 1N4741AUR/TR has a nominal Zener voltage of 11 V with a tolerance of ±5%, indicated by the "A" suffix in its part number. This tolerance is guaranteed over the full operating temperature range and is measured after 90 seconds of DC current application per datasheet Note 4. The 1N4741AUR/TR does not support tighter tolerances like ±2% or ±1% - those require "C" or "D" suffix variants.
Can the 1N4741AUR/TR replace a through-hole 1N4741A in existing designs?
No direct drop-in replacement is possible because the 1N4741AUR/TR uses a DO-213AB glass MELF surface-mount package, whereas the 1N4741A uses a DO-41 axial-leaded package. Layout redesign and thermal validation are required. The 1N4741AUR/TR offers lower thermal resistance to end cap (50 °C/W) but higher junction-to-ambient resistance (130 °C/W) on FR4 - meaning PCB pad design must follow Microsemi's recommended footprint to sustain 1.0 W.
What is the maximum steady-state current the 1N4741AUR/TR can regulate at 50 °C ambient?
At TA = 50 °C, the 1N4741AUR/TR supports a maximum regulator current (IZM) of 414 mA, as specified in the Electrical Characteristics table. This value assumes proper mounting on FR4 with 1 oz copper and the recommended pad layout. Exceeding this current risks exceeding the 1.0 W power limit and thermal runaway, especially above 45 °C ambient.
Does the 1N4741AUR/TR meet RoHS requirements?
Yes - the "e3" suffix in the full part number 1N4741AUR/TR-e3 confirms RoHS compliance. The terminals use annealed matte-tin plating per MIL-STD-750 Method 2026, and the device meets JEDEC J-STD-020 moisture sensitivity level 1. Standard non-e3 versions are tin-lead plated and not RoHS compliant.
How is polarity identified on the 1N4741AUR/TR?
The 1N4741AUR/TR uses a single cathode band on the glass body to indicate polarity. The banded end is the cathode and must be connected to the more positive potential in Zener regulation mode. During forward conduction testing, the unbanded end is the anode. No alphanumeric marking is present - only the band, consistent with DO-213AB MELF standards.
1N4741AUR/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:
- ±5%
- 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)
1N4741AUR/TR FAQ
1.How can I place an order for 1N4741AUR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4741AUR/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 1N4741AUR/TR reliable?
The price and inventory of 1N4741AUR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4741AUR/TR is usually 5 days.
3.What payment methods are accepted for 1N4741AUR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4741AUR/TR transactions.
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4.How is shipping managed for 1N4741AUR/TR?
1N4741AUR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4741AUR/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 1N4741AUR/TR?
For technical support, including 1N4741AUR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4741AUR/TR requirements.
6.How does Aetrix verify that 1N4741AUR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4741AUR/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 1N4741AUR/TR meets industry standards.
7.What is the process for return or replacement of 1N4741AUR/TR?
All 1N4741AUR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4741AUR/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 1N4741AUR/TR part is unused and in its original packaging.
Return procedure for 1N4741AUR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4741AUR/TR Tags
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