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Microchip Technology 1N4763UR-1/TR
- Part No.:
- 1N4763UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4763UR-1/TR.pdf
- Description:
- DIODE ZENER 91V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,214
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Product details
Overview
1N4763UR-1/TR from Microsemi is a surface-mount 1.0 W glass Zener diode with nominal Zener voltage 91 V, ±5% tolerance (A-suffix), 2.8 mA test current, 250 Ω dynamic impedance at IZT, and 10 μA maximum reverse leakage at 69.2 V. It operates from –65 °C to +175 °C and is used for precision voltage regulation in high-reliability power supply feedback loops.
For engineers reviewing the 1N4763UR-1/TR datasheet, 1N4763UR-1/TR pinout, 1N4763UR-1/TR application, or 1N4763UR-1/TR equivalent, key selection criteria include Zener voltage stability over temperature, low dynamic impedance for tight regulation, hermetic DO-213AB glass MELF packaging, and RoHS-compliant tin plating with tape-and-reel delivery (TR suffix).
Technical Context
This device functions as a two-terminal voltage reference diode operating in reverse breakdown. Its Zener voltage is specified at 91 V with 2.8 mA test current and exhibits 250 Ω dynamic impedance at that point, ensuring predictable regulation under varying load conditions.
The DO-213AB glass MELF package provides hermetic sealing, radiation hardness per MicroNote 050, and thermal resistance of 130 °C/W junction-to-ambient on FR4 with recommended footprint - critical for sustained 1.0 W dissipation in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 91 V ±5% at 2.8 mA - defines stable regulation point for feedback networks |
| Power Dissipation | 1.0 W at TEC < 125 °C - supports continuous operation without forced cooling |
| Dynamic Impedance (ZZT) | 250 Ω at IZT = 2.8 mA - limits output voltage variation under load transients |
| Reverse Leakage Current | 10 μA max at VR = 69.2 V - ensures minimal quiescent current in standby mode |
| Operating Temperature | –65 °C to +175 °C - enables use in aerospace, downhole, and industrial environments |
| Package | DO-213AB glass MELF - hermetically sealed, leadless, ESD-insensitive, radiation-hardened |
| Thermal Resistance | 130 °C/W junction-to-ambient on FR4 (1 oz Cu) - guides PCB copper area requirements |
Pinout & Package
DO-213AB glass MELF package: cylindrical, leadless, cathode band marked on body. Terminals are axial - anode and cathode accessed via opposite ends of the cylinder. No internal leads or pads; soldered directly to metallized end caps.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener breakdown terminal | Connected to regulated output node; must be held positive relative to anode for conduction |
| Anode (unbanded end) | Reference/return terminal | Connected to ground or lower-potential rail; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Enables operation in harsh environments (humidity, radiation, thermal cycling) without encapsulation degradation |
| ±5% Zener voltage tolerance (A-suffix) | Meets standard precision regulation needs without requiring post-manufacture sorting or trimming |
| 1.0 W steady-state power rating | Supports higher-current shunt regulation than SOD-123 or SMA Zeners in same footprint class |
| RoHS-compliant matte-tin plating | Ensures reliable solderability with lead-free reflow profiles (260 °C/10 s max) |
| Specified knee impedance (ZZK) | 50 Ω at IZK = 0.25 mA - guarantees stable turn-on behavior near regulation threshold |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback loop using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Zener reference diode providing precise 91 V threshold for secondary-side voltage sensing. Use Value: Maintains ±1% output accuracy across –40 °C to +125 °C due to low tempco and stable Zener knee. |
Use Scenario: Clamps transient overvoltage on DC bus lines in motor drives or solar inverters before damage occurs. IC Role / Device Role / Timing Role: Shunt protection element absorbing surge energy up to 3000 mA peak (IS) during line spikes. Use Value: Survives repeated ½-sine surges without parameter shift thanks to hermetic glass construction and 175 °C max junction temperature. |
| High-Temperature Sensor Interface | Aerospace Power Conditioning |
Use Scenario: Provides stable bias voltage for analog front-end circuitry in downhole oil/gas sensors operating at 150 °C ambient. IC Role / Device Role / Timing Role: Precision voltage reference maintaining regulation integrity where polymer-packaged Zeners fail. Use Value: Delivers <100 ppm/°C voltage drift and zero parametric shift after 1000 thermal cycles (–65 °C to +175 °C). |
Use Scenario: Used in satellite power distribution units requiring radiation-tolerant, long-lifetime voltage references. IC Role / Device Role / Timing Role: Radiation-hardened Zener reference compliant with MIL-PRF-19500 screening options (JAN/JANTXV). Use Value: Inherently radiation-hard per MicroNote 050; no derating required for total ionizing dose up to 100 krad(Si). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4763A-TP (Micro Commercial) | Same 91 V ±5%, but plastic SOD-123 package; 750 mW rating; 350 Ω ZZT; non-hermetic | Limited to commercial-temp (–65 °C to +150 °C) and non-radiation environments | Select when cost sensitivity outweighs reliability, temperature range, or radiation requirements |
| BZX85C91 (Nexperia) | 91 V ±5%, DO-41 axial leaded; 1.3 W rating; 200 Ω ZZT; higher capacitance (~50 pF) | Requires through-hole mounting; unsuitable for high-density SMT designs | Select only if legacy through-hole assembly is mandated and board space permits axial footprint |
Compared with 1N4763UR-1/TR, the 1N4763A-TP offers lower cost but sacrifices hermeticity, radiation hardness, and thermal capability; the BZX85C91 delivers slightly lower impedance but introduces layout constraints and eliminates surface-mount compatibility.
Availability
1N4763UR-1/TR is available at Aetrix Electronics and suitable for switching power supply feedback, overvoltage protection circuits, high-temperature sensor interfaces, and aerospace power conditioning requiring stable component supply across extended temperature and reliability envelopes.
Supply support for 1N4763UR-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, radiation-hardened, and high-temperature analog and mixed-signal components.
The 1N4763UR-1/TR belongs to Microsemi's surface-mount glass Zener diode family designed for mission-critical voltage regulation where hermeticity, wide temperature operation, and long-term stability are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4763UR-1/TR?
The 1N4763UR-1/TR has a nominal Zener voltage of 91 V with ±5% tolerance, indicated by the "A" suffix in its designation. This tolerance is verified at 2.8 mA test current and 30 °C case temperature per Microsemi's electrical characteristics table. The "UR" prefix denotes the DO-213AB surface-mount variant of the legacy 1N47xx series.
Does 1N4763UR-1/TR require derating above 45 °C ambient?
Yes - the 1N4763UR-1/TR must be derated linearly above 45 °C ambient when mounted on FR4 with 1 oz copper, per Figure 1 in the datasheet. At 100 °C ambient, its power dissipation is reduced to approximately 0.55 W. Derating is based on 130 °C/W thermal resistance junction-to-ambient and ensures junction temperature remains below 175 °C.
Is 1N4763UR-1/TR compatible with lead-free reflow processes?
Yes - the 1N4763UR-1/TR features RoHS-compliant annealed matte-tin plating and is rated for solder exposure up to 260 °C for 10 seconds, fully compliant with IPC/JEDEC J-STD-020 moisture/reflow standards. The "e3" suffix in related part numbers confirms this qualification, and the TR tape-and-reel packaging supports automated SMT placement.
Can 1N4763UR-1/TR replace axial 1N4763A in existing designs?
No - the 1N4763UR-1/TR uses a DO-213AB glass MELF package, while the axial 1N4763A uses DO-41. They are electrically equivalent but not mechanically interchangeable. Substitution requires PCB redesign to accommodate the cylindrical surface-mount footprint and end-cap soldering, including revised pad layout per Microsemi's recommended dimensions (Page 3).
What is the maximum surge current rating for 1N4763UR-1/TR?
The 1N4763UR-1/TR has a maximum non-repetitive reverse surge current (IS) of 3000 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating applies to transient clamping events such as ESD or inductive kickback, and is validated per Note 3 in the electrical characteristics table.
1N4763UR-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):
- 91 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 250 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 69.2 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)
1N4763UR-1/TR FAQ
1.How can I place an order for 1N4763UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4763UR-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 1N4763UR-1/TR reliable?
The price and inventory of 1N4763UR-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 1N4763UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4763UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4763UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4763UR-1/TR?
1N4763UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4763UR-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 1N4763UR-1/TR?
For technical support, including 1N4763UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4763UR-1/TR requirements.
6.How does Aetrix verify that 1N4763UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4763UR-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 1N4763UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4763UR-1/TR?
All 1N4763UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4763UR-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 1N4763UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4763UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4763UR-1/TR Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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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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