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Microchip Technology 1N4761AUR/TR
- Part No.:
- 1N4761AUR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4761AUR/TR.pdf
- Description:
- DIODE ZENER 75V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,374
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Product details
Overview
1N4761AUR/TR from Microsemi is a surface-mount 1.0 W glass-encapsulated Zener diode with nominal Zener voltage 75 V, ±5% tolerance, 3.3 mA test current, 175 Ω dynamic impedance at IZT, and maximum reverse current of 5 µA at 56.0 V. It operates from –65 °C to +175 °C and is used for precision voltage regulation in high-reliability power supply feedback paths.
For engineers reviewing the 1N4761AUR/TR datasheet, 1N4761AUR/TR pinout, 1N4761AUR/TR application, or 1N4761AUR/TR equivalent, this part delivers stable 75 V regulation in compact DO-213AB MELF package with hermetic glass sealing, low parasitic capacitance, and radiation-hardened performance per MicroNote 050 - critical for aerospace, industrial control, and medical power systems.
Technical Context
This Zener diode functions as a two-terminal shunt regulator, maintaining a stable 75 V reference across its cathode–anode terminals when reverse-biased above its breakdown threshold. Its operation relies on controlled avalanche breakdown in doped silicon, with specified knee impedance (ZZK = 12 Ω at IZK = 0.25 mA) ensuring sharp turn-on and low regulation error over temperature.
Designed for surface-mount assembly on FR4 PCBs with recommended pad layout, it achieves 130 °C/W thermal resistance to ambient and supports steady-state dissipation of 1.0 W below 45 °C ambient or 1.0 W below 125 °C end-cap temperature. The cathode band marking and tin-lead or RoHS-compliant 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) | 75 V ±5% at 3.3 mA - defines precise regulation setpoint for feedback loops |
| Power Dissipation | 1.0 W at TEC < 125 °C - sets maximum continuous thermal load on PCB layout |
| Dynamic Impedance (ZZT) | 175 Ω at IZT = 3.3 mA - determines output voltage variation under load transients |
| Reverse Current (IR) | 5 µA max at VR = 56.0 V - ensures low leakage in standby or low-power modes |
| Operating Temperature | –65 °C to +175 °C - enables use in extended-environment automotive, downhole, and avionics systems |
| Knee Impedance (ZZK) | 12 Ω at IZK = 0.25 mA - guarantees stable regulation onset near minimum bias current |
| Forward Voltage | 1.2 V max at 200 mA - defines conduction loss if accidentally forward-biased |
Pinout & Package
Package: DO-213AB glass MELF (hermetically sealed, leadless cylindrical surface-mount package, 2.39–2.66 mm diameter × 4.80–5.20 mm length).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher-potential side of circuit; reverse-bias voltage applied here for Zener operation |
| Anode (unbanded end) | Reference/return node | Connected to lower-potential side (e.g., ground or feedback divider tap); completes regulation path |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Enables operation up to +175 °C and provides immunity to moisture-induced parameter drift |
| Radiation hardness per MicroNote 050 | Supports deployment in space-grade and nuclear instrumentation without derating |
| Specified knee impedance (12 Ω) | Ensures predictable low-current regulation behavior in low-power bias networks |
| RoHS-compliant option (e3 suffix) | Meets global environmental compliance requirements without sacrificing electrical performance |
| Nonsensitive to ESD | Eliminates need for external protection circuitry during handling and assembly |
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: Shunt reference providing stable 75 V threshold to drive TL431 or optocoupler LED. Use Value: Maintains ±1% output accuracy over –40 °C to +105 °C due to tight Zener tolerance and low tempco. |
Use Scenario: Generating precision bias voltage for radiation-tolerant analog front-ends in satellite telemetry systems. IC Role / Device Role / Timing Role: Primary voltage reference in high-reliability power sequencing circuits. Use Value: Delivers stable 75 V reference without parameter shift after 100 krad(Si) total ionizing dose exposure. |
| Medical Equipment Overvoltage Clamp | Downhole Oilfield Sensor Biasing |
Use Scenario: Clamping transient surges on patient-connected signal lines in diagnostic imaging equipment. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting downstream ADC inputs from >100 V spikes. Use Value: Responds within nanoseconds with <5 µA leakage at 56 V, preserving signal integrity during normal operation. |
Use Scenario: Providing regulated bias to piezoresistive pressure sensors operating at 150 °C in oil-well drill collars. IC Role / Device Role / Timing Role: High-temperature Zener reference in sensor excitation circuitry. Use Value: Operates continuously at +175 °C ambient with no degradation in VZ stability or leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4761A | Same Zener voltage (75 V), ±5%, but in axial DO-41 package - larger footprint, higher thermal resistance (150 °C/W vs. 130 °C/W) | Preferred for through-hole prototyping or legacy board rework where SMT is not available | Select only if DO-41 mounting is required; not drop-in compatible with 1N4761AUR/TR footprint |
| SMAJ4761A | Same electrical specs, but in SMA package - plastic body, lower cost, non-hermetic, rated only to +150 °C | Suitable for commercial-grade consumer power supplies where radiation hardness and extreme temperature are not required | Choose for cost-sensitive volume production where hermeticity and >+150 °C operation are unnecessary |
Compared with 1N4761AUR/TR, the 1N4761A requires PCB redesign for axial mounting and offers inferior thermal performance, while SMAJ4761A sacrifices hermetic sealing and high-temperature capability for lower cost and standard plastic packaging - making 1N4761AUR/TR the sole choice for mission-critical, high-temp, radiation-exposed applications.
Availability
1N4761AUR/TR is available at Aetrix Electronics and suitable for industrial power supplies, aerospace voltage references, and downhole sensor biasing requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1N4761AUR/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 1N4761AUR/TR belongs to Microsemi's surface-mount glass Zener diode family, engineered for voltage regulation in harsh-environment applications where hermetic sealing, wide temperature range, and radiation tolerance are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4761AUR/TR?
The 1N4761AUR/TR has a nominal Zener voltage of 75 V with a tolerance of ±5%, as indicated by the "A" suffix in the part number. This tolerance is guaranteed over the full operating temperature range of –65 °C to +175 °C and is verified per Microsemi's qualification testing per MIL-PRF-19500 for high-reliability variants.
Can 1N4761AUR/TR be used in place of through-hole 1N4761A?
No - the 1N4761AUR/TR uses a DO-213AB glass MELF surface-mount package, while the 1N4761A uses a DO-41 axial-leaded package. Their footprints, thermal paths, and assembly processes are incompatible. Substitution requires PCB redesign and requalification; 1N4761AUR/TR is not a drop-in replacement for 1N4761A.
What is the maximum surge current rating for 1N4761AUR/TR?
The 1N4761AUR/TR has a maximum surge current (IS) of 2000 mA, measured using a ½ sine-wave pulse of 1/120 second duration at 25 °C ambient. This rating applies to short-duration transients such as ESD or inductive switching spikes, and must be derated per the power derating curve in Figure 1 when ambient or end-cap temperature exceeds 25 °C.
Is 1N4761AUR/TR RoHS compliant?
Yes - the "TR" suffix denotes tape-and-reel packaging, and the "e3" designation (as documented in the Microsemi datasheet) confirms RoHS compliance. The device uses annealed matte-tin plating and meets EU Directive 2011/65/EU requirements without exemptions, verified via material declarations and analytical testing.
What is the thermal resistance junction-to-ambient for 1N4761AUR/TR on FR4?
When mounted on an FR4 PCB with 1 oz copper and Microsemi's recommended footprint, the 1N4761AUR/TR exhibits a thermal resistance of 130 °C/W junction-to-ambient. This value assumes proper pad layout per Page 3 of the datasheet and is used to calculate safe operating power limits at elevated ambient temperatures.
1N4761AUR/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:
- ±5%
- 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)
1N4761AUR/TR FAQ
1.How can I place an order for 1N4761AUR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4761AUR/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 1N4761AUR/TR reliable?
The price and inventory of 1N4761AUR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4761AUR/TR is usually 5 days.
3.What payment methods are accepted for 1N4761AUR/TR?
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4.How is shipping managed for 1N4761AUR/TR?
1N4761AUR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4761AUR/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 1N4761AUR/TR?
For technical support, including 1N4761AUR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4761AUR/TR requirements.
6.How does Aetrix verify that 1N4761AUR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4761AUR/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 1N4761AUR/TR meets industry standards.
7.What is the process for return or replacement of 1N4761AUR/TR?
All 1N4761AUR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4761AUR/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 1N4761AUR/TR part is unused and in its original packaging.
Return procedure for 1N4761AUR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4761AUR/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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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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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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