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Microchip Technology 1N4744UR/TR
- Part No.:
- 1N4744UR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4744UR/TR.pdf
- Description:
- DIODE ZENER 15V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,471
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Product details
Overview
1N4744UR/TR from Microsemi is a surface-mount 15 V, ±5% tolerance, 1.0 W glass-encapsulated Zener diode in DO-213AB (MELF) package, rated for 17 mA test current, 14 Ω dynamic impedance at IZT, and reverse leakage ≤5 µA at 11.4 V, used for precision voltage regulation in power supply feedback loops and reference circuits.
For engineers reviewing the 1N4744UR/TR datasheet, 1N4744UR/TR pinout, 1N4744UR/TR application, or 1N4744UR/TR equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (130 °C/W on FR4), surge current rating (304 mA), hermetic glass MELF construction, and RoHS-compliant e3 suffix availability.
Technical Context
This device operates as a two-terminal voltage reference diode with sharp Zener breakdown at 15 V nominal, specified at 30 °C case temperature and measured 90 s after DC current application. It delivers stable regulation across –65 °C to +175 °C operating range and supports steady-state dissipation of 1.0 W below 125 °C end-cap temperature.
Its DO-213AB glass MELF package provides low parasitic capacitance, ESD insensitivity, and inherent radiation hardness per MicroNote 050. The cathode band marking and tin-lead or matte-tin plating ensure unambiguous polarity and solderability per MIL-STD-750 Method 2026.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15 V ±5% - precise regulation point for feedback networks requiring tight tolerance |
| Test Current (IZT) | 17 mA - standardized bias condition for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZT) | 14 Ω @ IZT - low AC impedance ensures minimal output voltage variation under load transients |
| Max Reverse Leakage (IR) | 5 µA @ 11.4 V - guarantees low quiescent current in high-impedance reference paths |
| Power Dissipation | 1.0 W @ TEC < 125 °C - defines maximum continuous DC power handling on thermally optimized PCB |
| Thermal Resistance | 130 °C/W junction-to-ambient (FR4, 1 oz Cu) - determines temperature rise under real-world board mounting |
| Surge Current (IS) | 304 mA - peak non-repetitive current capability for transient overvoltage clamping |
Pinout & Package
DO-213AB glass MELF package: cylindrical hermetically sealed body with axial terminals; cathode identified by single black band; no polarity-specific pins-device has two symmetric terminals with functional asymmetry defined solely by band orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection in reverse-bias configuration | Must be held at higher potential than anode to enable Zener conduction and voltage regulation |
| Anode (unbanded end) | Zener cathode connection in reverse-bias configuration | Reference ground or lower-potential node in shunt regulator topology |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Enables operation from –65 °C to +175 °C and eliminates moisture-induced parameter drift |
| Low dynamic impedance (14 Ω) | Minimizes output voltage deviation during load current changes in precision references |
| Specified knee impedance (ZZK) | Ensures stable low-current regulation down to 0.25 mA test point for standby-mode circuits |
| RoHS-compliant e3 option | Meets environmental compliance requirements without sacrificing electrical or thermal performance |
| Inherent radiation hardness | Validated per MicroNote 050 for use in aerospace and defense systems exposed to ionizing radiation |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Shunt-connected in optocoupler feedback path of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Voltage reference element providing stable 15 V threshold for error amplifier comparison. Use Value: ±5% VZ tolerance and 14 Ω ZZT ensure <1% output regulation error across line/load/temperature. | Use Scenario: Biasing bridge sensors in 4–20 mA transmitter front-ends requiring stable excitation voltage. IC Role / Device Role / Timing Role: Precision shunt reference supplying fixed 15 V to Wheatstone bridge. Use Value: Low 5 µA leakage at 11.4 V prevents loading errors in high-impedance sensor interfaces. |
| Automotive ECUs | Medical Instrumentation |
Use Scenario: Overvoltage clamp protecting microcontroller I/O pins against load-dump transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Transient voltage suppressor operating in Zener breakdown during surge events. Use Value: 304 mA surge rating and 175 °C max operating temperature support AEC-Q200-relevant reliability. | Use Scenario: Calibration reference in portable ECG amplifiers where long-term stability and low noise are critical. IC Role / Device Role / Timing Role: Primary voltage reference for analog front-end gain-setting DACs. Use Value: Hermetic glass package prevents parameter shift due to humidity exposure in clinical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744AUR | Same Zener voltage (15 V), ±5%, but in same DO-213AB package without TR tape-and-reel packaging | No reel packaging - suitable for manual prototyping or low-volume hand-soldering | Select 1N4744AUR when tape-and-reel automation is not required and unit cost optimization is prioritized |
| BZX84-C15 | SOT-23 plastic package, 15 V ±5%, 300 mW rating, higher ZZT (30 Ω), wider temp range (–65 °C to +150 °C) | Lower power handling and higher impedance limit use in high-precision or high-current regulation | Select BZX84-C15 only for space-constrained PCBs where 1 W dissipation is unnecessary and cost is critical |
Compared with 1N4744AUR and BZX84-C15, the 1N4744UR/TR offers superior thermal performance (1.0 W vs. 300 mW), lower dynamic impedance (14 Ω vs. 30 Ω), and hermetic reliability-making it optimal for industrial and automotive applications demanding long-term stability under thermal stress.
Availability
1N4744UR/TR is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, automotive electronic control units, and medical instrumentation requiring stable component supply with full traceability and lifecycle management.
Supply support for 1N4744UR/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N47xxUR/TR series belongs to Microsemi's surface-mount glass Zener diode product line, engineered for high-density, low-parasitic voltage regulation in mission-critical systems where hermetic sealing and radiation tolerance are essential.
FAQ
What is the Zener voltage tolerance of the 1N4744UR/TR?
The 1N4744UR/TR has a nominal Zener voltage of 15 V with a tolerance of ±5%, as indicated by the "A" suffix in its full designation. This tolerance is verified at 30 °C case temperature with measurement performed 90 seconds after DC current application, per Microsemi's published electrical characteristics table.
Does the 1N4744UR/TR require heatsinking in standard PCB layouts?
The 1N4744UR/TR does not require external heatsinking when mounted on FR4 with 1 oz copper using the recommended pad layout, as its thermal resistance is 130 °C/W junction-to-ambient. At 1.0 W dissipation and 25 °C ambient, junction temperature rises to approximately 155 °C-within its –65 °C to +175 °C operating range.
Is the 1N4744UR/TR RoHS compliant?
Yes-the "e3" suffix in the full part number (1N4744UR/TR,e3) explicitly denotes RoHS compliance. The device uses annealed matte-tin plating on terminals and meets JEDEC J-STD-020 moisture sensitivity level 1, with solder reflow profile compatibility up to 260 °C for 10 seconds.
How is polarity identified on the 1N4744UR/TR?
Polarity is marked by a single black cathode band on the glass MELF body of the 1N4744UR/TR. During operation, the banded end must be biased positively relative to the unbanded end to achieve Zener breakdown and voltage regulation-reversal causes forward conduction at ~1.2 V.
What is the maximum surge current rating for the 1N4744UR/TR?
The 1N4744UR/TR is rated for a maximum non-repetitive reverse surge current (IS) of 304 mA, measured using a ½ sine-wave pulse of 1/120 second duration at 25 °C ambient. This rating supports transient overvoltage protection in automotive and industrial power rails.
1N4744UR/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):
- 15 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 14 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 11.4 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)
1N4744UR/TR FAQ
1.How can I place an order for 1N4744UR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4744UR/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 1N4744UR/TR reliable?
The price and inventory of 1N4744UR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4744UR/TR is usually 5 days.
3.What payment methods are accepted for 1N4744UR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4744UR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4744UR/TR?
1N4744UR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4744UR/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 1N4744UR/TR?
For technical support, including 1N4744UR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4744UR/TR requirements.
6.How does Aetrix verify that 1N4744UR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4744UR/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 1N4744UR/TR meets industry standards.
7.What is the process for return or replacement of 1N4744UR/TR?
All 1N4744UR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4744UR/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 1N4744UR/TR part is unused and in its original packaging.
Return procedure for 1N4744UR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4744UR/TR Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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