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Microchip Technology 1N4758UR-1/TR
- Part No.:
- 1N4758UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4758UR-1/TR.pdf
- Description:
- DIODE ZENER 56V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,348
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Product details
Overview
1N4758UR-1/TR from Microsemi is a surface-mount 1.0 W glass Zener diode with nominal Zener voltage 56 V, ±5% tolerance (A-suffix), 4.5 mA test current, 110 Ω dynamic impedance at IZT, and 5 μA maximum reverse leakage at 42.6 V. It operates from –65 °C to +175 °C and is used for precision voltage regulation in high-density power supply feedback loops.
For engineers reviewing the 1N4758UR-1/TR datasheet, 1N4758UR-1/TR pinout, 1N4758UR-1/TR application, or 1N4758UR-1/TR equivalent, key selection criteria include its DO-213AB MELF glass package, hermetic sealing, radiation-hardened performance per MicroNote 050, and tight thermal resistance (130 °C/W on FR4).
Technical Context
This Zener diode delivers stable voltage reference regulation via controlled reverse-breakdown conduction. Its glass hermetic DO-213AB package ensures low parasitic capacitance and high reliability in harsh environments, with specified knee impedance (16 Ω at 0.25 mA) confirming sharp breakdown characteristics.
It supports steady-state 1.0 W dissipation up to 125 °C end-cap temperature or 45 °C ambient on FR4 with recommended pad layout. Forward voltage is ≤1.2 V at 200 mA, and it withstands 260 °C soldering for 10 s - critical for reflow-compatible SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±5% - sets precise regulation point for feedback networks in DC-DC converters. |
| Power Dissipation | 1.0 W at TEC < 125 °C - defines maximum continuous thermal load on PCB without derating. |
| Test Current (IZT) | 4.5 mA - operating point where VZ and ZZT are guaranteed; used for calibration and stability design. |
| Dynamic Impedance (ZZT) | 110 Ω at IZT - quantifies voltage variation under load transients; lower values improve regulation fidelity. |
| Reverse Leakage (IR) | 5 μA at 42.6 V - ensures minimal quiescent current loss in standby or low-power modes. |
| Operating Temperature | –65 °C to +175 °C - enables deployment in automotive under-hood, aerospace, and industrial control systems. |
| Thermal Resistance | 130 °C/W junction-to-ambient (FR4, 1 oz Cu) - determines required copper area and airflow for thermal management. |
Pinout & Package
Package: DO-213AB glass MELF (hermetically sealed, leadless cylindrical surface-mount). Cathode indicated by single black band; device operated with banded end positive during Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to regulated output node in shunt configuration; defines ground reference for feedback divider. |
| Cathode | Zener breakdown terminal | Banded end; connected to higher-potential rail (e.g., DC-DC output); carries full regulator current during operation. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift; supports >20-year field life in sealed enclosures. |
| Radiation hardness (per MicroNote 050) | Enables use in space-qualified and nuclear instrumentation systems without additional shielding or screening. |
| Nonsensitive to ESD | Withstands human-body-model discharges ≥8 kV without parameter shift - reduces handling and assembly safeguards. |
| Specified knee impedance (ZZK) | 16 Ω at 0.25 mA - ensures stable turn-on behavior near regulation threshold, critical for low-current biasing. |
| RoHS-compliant (e3 suffix) | Tin-plated terminals meet JEDEC J-STD-609 Class 1 moisture sensitivity and EU RoHS Directive 2011/65/EU. |
Applications
| Industrial Power Supply Feedback | Automotive Engine Control Unit (ECU) Reference |
|---|---|
Use Scenario: Regulating output voltage of isolated flyback or forward converter in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Shunt voltage reference in optocoupler-coupled feedback loop, setting precise 56 V threshold for overvoltage protection and trim adjustment. Use Value: Maintains ±0.5% output accuracy across –40 °C to +85 °C ambient due to low tempco and hermetic stability. |
Use Scenario: Providing stable 56 V reference for analog sensor signal conditioning in diesel engine ECU fuel injection timing circuits. IC Role / Device Role / Timing Role: Zener clamp protecting ADC input stage from transient overvoltage during load dump events. Use Value: Survives 175 °C under-hood temperatures and meets AEC-Q200 stress requirements without derating. |
| Aerospace Avionics Bias Network | Medical Imaging High-Voltage Monitor |
Use Scenario: Generating calibrated bias voltage for photomultiplier tube (PMT) gain control in satellite-based radiation detectors. IC Role / Device Role / Timing Role: Radiation-hardened voltage reference establishing fixed gain ratio in multi-stage HV divider networks. Use Value: Zero parameter shift after 100 krad(Si) total ionizing dose exposure per MicroNote 050 validation. |
Use Scenario: Monitoring 56 V auxiliary rail in portable X-ray generator power management subsystems. IC Role / Device Role / Timing Role: Precision shunt regulator verifying HV converter output before enabling X-ray tube firing sequence. Use Value: Enables <10 ppm/h long-term stability required for FDA-compliant diagnostic accuracy certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4758AUR-1/TR | Same Zener voltage (56 V), ±5% tolerance, DO-213AB package, but lacks e3 RoHS marking; tin-lead terminations. | Approved for legacy military/aerospace programs requiring MIL-PRF-19500 screening (JAN/JANTXV variants available). | Select when RoHS compliance is not required and legacy qualification documentation is mandatory. |
| SMAJ4758A | Same 56 V rating, ±5%, but in SMA package (plastic, not glass); higher capacitance (~20 pF vs. ~5 pF), lower surge rating (400 W vs. 2000 W peak). | Suitable for cost-sensitive consumer electronics where hermeticity and radiation hardness are unnecessary. | Choose for high-volume commercial designs prioritizing PCB area and assembly cost over reliability and stability. |
Compared with 1N4758UR-1/TR, the 1N4758AUR-1/TR offers identical electrical specs but non-RoHS termination, while SMAJ4758A trades hermeticity and surge robustness for lower cost and plastic-package manufacturability - making the 1N4758UR-1/TR optimal for mission-critical, high-reliability applications.
Availability
1N4758UR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, aerospace avionics, and medical imaging systems requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for 1N4758UR-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-voltage analog components for defense, aerospace, and industrial markets.
The 1N4758UR-1/TR belongs to Microsemi's surface-mount Zener diode family designed for precision voltage regulation in extreme-temperature, high-density, and safety-critical systems where hermetic integrity and parametric stability are non-negotiable.
FAQ
What is the Zener voltage tolerance of the 1N4758UR-1/TR?
The 1N4758UR-1/TR has a nominal Zener voltage of 56 V with ±5% tolerance, denoted by the "A" suffix in its designation. This tolerance is verified at 4.5 mA test current and 30 °C case temperature, ensuring predictable regulation across production lots and temperature ranges.
Is the 1N4758UR-1/TR RoHS compliant?
Yes, the 1N4758UR-1/TR is RoHS compliant, confirmed by the "e3" suffix in its full part number. Its terminations use annealed matte-tin plating per MIL-STD-750 Method 2026, meeting EU Directive 2011/65/EU and JEDEC J-STD-609 Class 1 standards.
What is the maximum surge current rating for the 1N4758UR-1/TR?
The 1N4758UR-1/TR supports a maximum reverse surge current of 2000 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating enables reliable operation during transient overvoltage events in power supply and protection circuits.
How does the DO-213AB package affect PCB layout for the 1N4758UR-1/TR?
The DO-213AB MELF package requires specific pad geometry: 2.8 mm length × 1.8 mm width copper pads with 7.0 mm center-to-center spacing. This layout minimizes thermal resistance (130 °C/W) and prevents tombstoning during reflow - details are provided in Microsemi's package drawing on page 3 of the datasheet.
Does the 1N4758UR-1/TR require derating above 45 °C ambient temperature?
Yes, the 1N4758UR-1/TR must be derated linearly above 45 °C ambient when mounted on FR4 with 1 oz copper and the recommended footprint. Derating follows 130 °C/W thermal resistance, reducing power dissipation by 7.7 mW/°C above 45 °C to maintain safe junction temperature.
1N4758UR-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):
- 56 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 110 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 42.6 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)
1N4758UR-1/TR FAQ
1.How can I place an order for 1N4758UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4758UR-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 1N4758UR-1/TR reliable?
The price and inventory of 1N4758UR-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 1N4758UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4758UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4758UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4758UR-1/TR?
1N4758UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4758UR-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 1N4758UR-1/TR?
For technical support, including 1N4758UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4758UR-1/TR requirements.
6.How does Aetrix verify that 1N4758UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4758UR-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 1N4758UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4758UR-1/TR?
All 1N4758UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4758UR-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 1N4758UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4758UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4758UR-1/TR Tags
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