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Microchip Technology 1N4761UR-1/TR
- Part No.:
- 1N4761UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4761UR-1/TR.pdf
- Description:
- DIODE ZENER 75V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,270
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Product details
Overview
1N4761UR-1/TR from Microsemi is a surface-mount 1.0 W glass Zener diode with a nominal Zener voltage of 75 V, ±5% tolerance (A-suffix), 3.3 mA test current, and 175 °C maximum operating temperature. It features hermetically sealed DO-213AB MELF packaging, low dynamic impedance (16 Ω at IZT), and is rated for 2000 mA maximum regulator current at TA = 50 °C - used for precision voltage regulation in high-reliability power supply feedback loops.
For engineers reviewing the 1N4761UR-1/TR datasheet, 1N4761UR-1/TR pinout, 1N4761UR-1/TR application, or 1N4761UR-1/TR equivalent, key selection criteria include Zener voltage stability across temperature, low knee impedance (12 Ω at IZK = 0.25 mA), JEDEC-compliant surface-mount footprint, and radiation-hardened performance per MicroNote 050.
Technical Context
This device operates as a two-terminal voltage reference in reverse-bias breakdown mode, delivering stable regulation over 0.25–2000 mA current range and −65 °C to +175 °C ambient. Its glass MELF construction ensures hermeticity, low parasitic capacitance, and immunity to moisture-induced degradation.
The 1N4761UR-1/TR exhibits a sharp Zener knee with ZZK = 12 Ω at IZK = 0.25 mA and ZZT = 16 Ω at IZT = 3.3 mA, enabling accurate low-current reference operation. Thermal resistance is 130 °C/W junction-to-ambient on FR4 (1 oz Cu) with recommended pad layout, supporting reliable 1.0 W dissipation up to 45 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 75 V ±5% at IZT = 3.3 mA - defines regulated output level in feedback networks |
| Power Dissipation | 1.0 W at TEC < 125 °C - sets thermal design margin for PCB layout and heatsinking |
| Dynamic Impedance | 16 Ω at IZT = 3.3 mA - determines load regulation error under varying current |
| Knee Impedance | 12 Ω at IZK = 0.25 mA - enables stable reference behavior at low bias currents |
| Reverse Leakage | 5 μA max at VR = 57 V - limits quiescent current in high-impedance sensing paths |
| Operating Temp | −65 °C to +175 °C - supports aerospace, downhole, and industrial environments |
| Surge Current | 2000 mA (½-sine, 1/120 s) - withstands transient overvoltage events without failure |
Pinout & Package
Package: DO-213AB glass MELF - cylindrical, leadless, hermetically sealed surface-mount package with cathode band marking; dimensions: Ø2.39–2.66 mm × 4.80–5.20 mm length; weight: 0.05 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection point | Must be biased positive relative to anode to enter breakdown; band identifies polarity during placement |
| Anode (unbanded end) | Zener cathode connection point | Connected to circuit ground or lower potential node; completes reverse-bias path |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift in harsh environments |
| Radiation hardness per MicroNote 050 | Enables use in space-grade and nuclear instrumentation without derating |
| Low ESD sensitivity | Reduces handling risk during SMT assembly; no special grounding required |
| Tight Zener voltage tolerance (±5%) | Minimizes calibration effort in precision feedback and reference circuits |
| RoHS-compliant (e3 suffix) | Meets global environmental compliance without sacrificing electrical performance |
Applications
| Industrial Power Supply Feedback | Aerospace Voltage Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated DC-DC converters using optocoupler feedback. IC Role / Device Role / Timing Role: Zener diode provides stable reference voltage for TL431 or optocoupler input stage. Use Value: 75 V rating allows direct sensing of high-voltage rails; ±5% tolerance reduces need for post-assembly trimming. |
Use Scenario: Providing primary voltage reference in satellite power management units exposed to total ionizing dose. IC Role / Device Role / Timing Role: Two-terminal passive reference replacing active ICs where radiation-induced latch-up must be avoided. Use Value: Inherent radiation hardness eliminates shielding or redundancy overhead; DO-213AB package resists mechanical shock during launch. |
| Downhole Oilfield Sensor Biasing | High-Temperature Motor Drive Protection |
Use Scenario: Biasing signal conditioning circuitry in borehole logging tools operating at 150 °C ambient. IC Role / Device Role / Timing Role: Zener clamps supply rail to protect downstream op-amps and ADCs from overvoltage. Use Value: 175 °C max operating temperature exceeds downhole requirements; hermetic seal prevents electrolyte corrosion. |
Use Scenario: Overvoltage protection for gate drivers in 3-phase inverters mounted near motor windings. IC Role / Device Role / Timing Role: Clamping transient spikes induced by IGBT switching to safeguard driver IC inputs. Use Value: 2000 mA surge rating absorbs repetitive switching transients; low ZZK ensures fast response below knee voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4761AUR-1/TR | Same Zener voltage (75 V), same DO-213AB package, identical electrical specs - differs only in part numbering convention (AUR vs UR) | No functional difference; both meet MIL-PRF-19500 screening options when prefixed (e.g., MV1N4761AUR) | Select 1N4761AUR-1/TR if legacy BOMs or distributor stock use AUR nomenclature |
| SMAJ4761A | Plastic-packaged SMA surface-mount variant; higher capacitance (~20 pF vs <5 pF), lower max temp (150 °C), non-hermetic | Suitable for commercial-grade consumer power supplies but not radiation- or moisture-critical systems | Choose SMAJ4761A only for cost-sensitive, non-mission-critical designs where hermeticity and radiation tolerance are unnecessary |
Compared with 1N4761UR-1/TR, 1N4761AUR-1/TR offers identical performance and form factor, while SMAJ4761A trades hermetic reliability and temperature range for lower cost and higher volume availability in plastic packaging.
Availability
1N4761UR-1/TR is available at Aetrix Electronics and suitable for industrial power supply feedback, aerospace voltage reference, downhole sensor biasing, and high-temperature motor drive protection requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4761UR-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 1N4761UR-1/TR belongs to Microsemi's surface-mount Zener diode family designed for voltage regulation in mission-critical systems where hermetic sealing, radiation tolerance, and wide temperature operation are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4761UR-1/TR?
The 1N4761UR-1/TR has a nominal Zener voltage of 75 V with a tolerance of ±5%, indicated by the "A" suffix in its full designation. This tolerance is verified at 3.3 mA test current and 30 °C case temperature, and remains stable across its full operating temperature range of −65 °C to +175 °C.
Does 1N4761UR-1/TR require special handling for ESD sensitivity?
No - the 1N4761UR-1/TR is explicitly characterized as nonsensitive to ESD per manufacturer documentation. Its glass MELF construction and terminal plating eliminate the need for special grounding or static-control protocols during SMT placement or manual handling.
Can 1N4761UR-1/TR be used in place of through-hole 1N4761A?
Yes, the 1N4761UR-1/TR is electrically equivalent to the axial-leaded 1N4761A but packaged in surface-mount DO-213AB format. While pinout differs (leadless MELF vs axial leads), it delivers identical Zener voltage, impedance, and thermal characteristics - making it a drop-in functional replacement where board space and mounting method permit.
What is the maximum steady-state power dissipation for 1N4761UR-1/TR on FR4 PCB?
The 1N4761UR-1/TR dissipates 1.00 W continuously when mounted on FR4 with 1 oz copper and Microsemi's recommended pad layout, provided ambient temperature stays below 45 °C. Above that, power must be derated linearly per Figure 1 in the datasheet, reaching zero at 125 °C ambient.
Is 1N4761UR-1/TR compliant with RoHS requirements?
Yes - the "e3" suffix in the full part number (e.g., 1N4761UR-1/TR e3) denotes RoHS-compliant matte-tin plating. The base 1N4761UR-1/TR meets RoHS Directive 2011/65/EU when ordered with this suffix, and uses lead-free solder compatible with standard reflow profiles up to 260 °C for 10 seconds.
1N4761UR-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):
- 75 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 175 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 56 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)
1N4761UR-1/TR FAQ
1.How can I place an order for 1N4761UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4761UR-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 1N4761UR-1/TR reliable?
The price and inventory of 1N4761UR-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 1N4761UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4761UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4761UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4761UR-1/TR?
1N4761UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4761UR-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 1N4761UR-1/TR?
For technical support, including 1N4761UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4761UR-1/TR requirements.
6.How does Aetrix verify that 1N4761UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4761UR-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 1N4761UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4761UR-1/TR?
All 1N4761UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4761UR-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 1N4761UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4761UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4761UR-1/TR Tags
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