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Microchip Technology 1N4750UR-1/TR
- Part No.:
- 1N4750UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4750UR-1/TR.pdf
- Description:
- DIODE ZENER 27V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,292
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Product details
Overview
1N4750UR-1/TR from Microsemi is a surface-mount 1.0 W glass Zener diode with a nominal Zener voltage of 27 V, ±5% tolerance (A-suffix), 9.5 mA test current, 35 Ω dynamic impedance at IZT, and 5 μA maximum reverse leakage at 20.6 V. It operates from –65 °C to +175 °C and is used for precision voltage regulation in high-density power supply rails and reference circuits.
For engineers reviewing the 1N4750UR-1/TR datasheet, 1N4750UR-1/TR pinout, 1N4750UR-1/TR application, or 1N4750UR-1/TR equivalent, this page delivers verified electrical specs, DO-213AB package details, thermal derating guidance, and validated alternative options for industrial and aerospace-grade voltage reference design.
Technical Context
This device implements a silicon planar Zener junction in a hermetically sealed DO-213AB glass MELF package, enabling stable breakdown behavior across wide temperature and current ranges. Its 27 V Zener voltage is specified at 9.5 mA (IZT) with 35 Ω dynamic impedance, ensuring low output variation under load transients.
The diode exhibits 0.25 A maximum regulator current at TA = 50 °C, 5 μA reverse leakage at 20.6 V (77% of VZ), and forward voltage ≤1.2 V at 200 mA - confirming suitability for bidirectional clamping and low-loss biasing applications where reliability and low parasitics are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V ±5% at 9.5 mA - defines regulated output level for reference and clamp circuits |
| Power Dissipation | 1.0 W at 25 °C - sets maximum continuous DC power handling before thermal derating |
| Dynamic Impedance (ZZT) | 35 Ω at IZT = 9.5 mA - determines output voltage stability under varying load current |
| Reverse Leakage (IR) | 5 μA max at VR = 20.6 V - ensures minimal quiescent current in standby regulation |
| Operating Temperature | –65 °C to +175 °C - supports deployment in extended-environment industrial and aerospace systems |
| Thermal Resistance | 130 °C/W junction-to-ambient on FR4 (1 oz Cu) - informs PCB copper area and heatsinking requirements |
| Forward Voltage | ≤1.2 V at 200 mA - enables use as low-drop rectifier or polarity protection element |
Pinout & Package
Package: DO-213AB glass MELF - hermetically sealed, leadless, cylindrical surface-mount package with cathode band marking. Dimensions: Ø2.39–2.66 mm × 4.80–5.20 mm length. Requires symmetric solder pads per Microsemi-recommended footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection point | Must be biased positive relative to anode for reverse-breakdown regulation; band identifies polarity during placement |
| Anode (unbanded end) | Zener cathode connection point | Connected to lower-potential node (e.g., ground or return rail); completes Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Enables operation up to +175 °C and eliminates moisture-induced parameter drift in harsh environments |
| JEDEC DO-213AB outline compliance | Ensures mechanical compatibility with standard SMT pick-and-place equipment and reflow profiles |
| ±5% Zener voltage tolerance (A-suffix) | Provides predictable regulation accuracy without requiring post-production trimming or selection |
| Low dynamic impedance (35 Ω) | Minimizes output voltage deviation during load steps - critical for analog reference stability |
| RoHS-compliant (e3 suffix) | Meets global environmental regulations while maintaining identical electrical performance |
Applications
| Industrial Power Supply Reference | Aerospace Voltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback node in isolated DC-DC converter secondary-side regulation. IC Role / Device Role / Timing Role: Precision shunt voltage reference providing error signal to optocoupler-driven controller. Use Value: 27 V Zener voltage and 35 Ω impedance maintain <±0.5% output regulation across 10–100 mA load range. |
Use Scenario: Overvoltage protection for avionics sensor interface inputs exposed to lightning-induced transients. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor clamping both positive and negative excursions. Use Value: Hermetic glass package withstands radiation exposure per MicroNote 050; 1.0 W rating absorbs 8/20 μs surge pulses. |
| High-Temperature Sensor Biasing | Test Equipment Calibration Reference |
Use Scenario: Providing stable bias current to RTD or thermocouple signal conditioning circuitry in downhole oil/gas tools. IC Role / Device Role / Timing Role: Constant-current source via series resistor + Zener regulation at elevated ambient temperatures. Use Value: Guaranteed operation to +175 °C with <100 ppm/°C voltage drift enables accurate sensor excitation over full range. |
Use Scenario: Serving as traceable 27 V reference in portable multimeter calibration modules. IC Role / Device Role / Timing Role: Primary voltage standard against which DMM ADC gain/offset are adjusted. Use Value: ±5% initial tolerance and low 35 Ω ZZT ensure repeatability within 0.1% over 1000-hour aging tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4750A-TR | Same 27 V ±5%, DO-41 through-hole package; higher thermal resistance (150 °C/W vs. 130 °C/W) | Requires axial-leaded PCB layout; less suitable for high-density SMT assemblies | Select when legacy through-hole compatibility or manual prototyping is required |
| SMAJ4750A | Same 27 V ±5%, SMA package; 1.5 W power rating; 40 Ω ZZT; RoHS-compliant by default | Higher surge capability but larger footprint; not hermetically sealed | Prefer for cost-sensitive consumer designs needing higher pulse energy absorption |
Compared with 1N4750UR-1/TR, the 1N4750A-TR offers identical regulation but lacks surface-mount efficiency and high-temperature robustness, while the SMAJ4750A trades hermetic reliability for higher surge rating and non-glass packaging - making the 1N4750UR-1/TR optimal for mission-critical, high-reliability SMT applications.
Availability
1N4750UR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, aerospace voltage clamping, high-temperature sensor biasing, and test equipment calibration requiring stable component supply and long-term obsolescence management.
Supply support for 1N4750UR-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 defense, aerospace, and industrial markets.
The 1N4750UR-1/TR belongs to Microsemi's surface-mount Zener diode family designed for precision voltage regulation in extreme-temperature, radiation-tolerant, and high-density electronic systems.
FAQ
What is the Zener voltage tolerance of the 1N4750UR-1/TR?
The 1N4750UR-1/TR has a nominal Zener voltage of 27 V with ±5% tolerance, indicated by the "A" suffix in its designation. This tolerance is guaranteed at 30 °C and 9.5 mA test current, and applies across its full operating temperature range of –65 °C to +175 °C. The 1N4750UR-1/TR does not support tighter tolerances like ±1% or ±2% - those require "D" or "C" suffix variants.
Is the 1N4750UR-1/TR RoHS compliant?
Yes, the "e3" suffix in the full ordering code (1N4750UR-1/TR e3) confirms RoHS compliance per EU Directive 2011/65/EU. The device uses annealed matte-tin plating on terminals and contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits. The 1N4750UR-1/TR maintains identical electrical specifications whether ordered with or without e3.
What is the maximum steady-state current for the 1N4750UR-1/TR at 50 °C ambient?
The 1N4750UR-1/TR supports a maximum regulator current (IZM) of 0.25 A at TA = 50 °C when mounted on an FR4 PCB with 1 oz copper and the recommended pad layout. This value is derived from its 1.0 W power rating and thermal resistance of 130 °C/W, and assumes proper solder joint integrity and airflow conditions per Microsemi's derating curve in Figure 1.
How is polarity marked on the 1N4750UR-1/TR?
The 1N4750UR-1/TR uses a single cathode band on the glass MELF body to indicate polarity. The banded end is the cathode and must be connected to the more positive potential in Zener regulation mode. During forward conduction, the unbanded end serves as the anode. No alphanumeric marking is present - only the band, consistent with DO-213AB mechanical standards.
Can the 1N4750UR-1/TR replace through-hole 1N4750A in existing designs?
No direct replacement is possible without layout revision: the 1N4750UR-1/TR uses DO-213AB surface-mount packaging, while the 1N4750A uses DO-41 through-hole. Their footprints, thermal paths, and assembly processes differ fundamentally. Though electrically equivalent, substituting the 1N4750UR-1/TR requires redesigning the PCB pad layout and requalifying thermal performance per Microsemi's DO-213AB mounting guidelines.
1N4750UR-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):
- 27 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 35 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 20.6 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)
1N4750UR-1/TR FAQ
1.How can I place an order for 1N4750UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4750UR-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 1N4750UR-1/TR reliable?
The price and inventory of 1N4750UR-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 1N4750UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4750UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4750UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4750UR-1/TR?
1N4750UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4750UR-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 1N4750UR-1/TR?
For technical support, including 1N4750UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4750UR-1/TR requirements.
6.How does Aetrix verify that 1N4750UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4750UR-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 1N4750UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4750UR-1/TR?
All 1N4750UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4750UR-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 1N4750UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4750UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4750UR-1/TR Tags
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