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Microchip Technology 1N4755UR-1/TR
- Part No.:
- 1N4755UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4755UR-1/TR.pdf
- Description:
- DIODE ZENER 43V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,130
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Product details
Overview
1N4755UR-1/TR from Microsemi is a surface-mount 1.0 W glass Zener diode with a nominal Zener voltage of 43 V, ±5% tolerance (A-suffix), DO-213AB MELF package, and 6.0 mA test current. It delivers stable voltage regulation in high-density power supply rails, ESD-protected interfaces, and precision reference circuits operating from −65 °C to +175 °C.
For engineers reviewing the 1N4755UR-1/TR datasheet, 1N4755UR-1/TR pinout, 1N4755UR-1/TR application, or 1N4755UR-1/TR equivalent, key selection criteria include its 43 V Zener voltage, 1.0 W steady-state power rating at TEC < 125 °C, low 22 Ω dynamic impedance at IZT, and hermetically sealed glass MELF construction for reliability in harsh environments.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage across load circuits. Its Zener voltage is specified at 43 V with 6.0 mA test current (IZT) and exhibits 22 Ω dynamic impedance (ZZT) under that condition, ensuring tight regulation under varying load currents.
The DO-213AB glass MELF package provides hermetic sealing, inherent radiation hardness per MicroNote 050, and low parasitic capacitance-critical for noise-sensitive analog references and high-reliability industrial control systems where long-term stability and thermal robustness are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V ±5% - precise clamping threshold for overvoltage protection and reference generation |
| Power Dissipation | 1.0 W at TEC < 125 °C - supports continuous regulation in compact thermal layouts |
| Test Current (IZT) | 6.0 mA - standardized bias point for guaranteed VZ and ZZT specification |
| Dynamic Impedance (ZZT) | 22 Ω @ IZT - low AC resistance ensures minimal output voltage variation under dynamic load changes |
| Max Reverse Current (IR) | 5 μA @ 32.7 V - confirms sharp knee and low leakage below breakdown threshold |
| Operating Temperature | −65 °C to +175 °C - enables deployment in automotive engine compartments and downhole electronics |
| Forward Voltage (VF) | 1.2 V max @ 200 mA - defines forward conduction behavior during transient polarity reversal |
Pinout & Package
Package: DO-213AB glass MELF - hermetically sealed, leadless cylindrical surface-mount package with cathode band marking; dimensions A = 2.39–2.66 mm, B = 4.80–5.20 mm, C = 0.41–0.55 mm; requires recommended FR4 pad layout per Microsemi datasheet page 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased terminal | Connected to higher potential side during Zener operation; voltage regulation occurs when cathode is positive relative to anode |
| Anode (unbanded end) | Reference/ground terminal | Serves as circuit common or ground reference point; reverse current flows from cathode to anode in regulation mode |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Enables operation up to +175 °C and eliminates moisture-induced parameter drift in sealed enclosures |
| Inherent radiation hardness | Validated per MicroNote 050 - suitable for aerospace and nuclear instrumentation without additional shielding |
| Nonsensitive to ESD | No special handling required - simplifies assembly and reduces field failure risk in unshielded PCB environments |
| Tight Zener voltage tolerance | ±5% (A-suffix) - eliminates need for post-assembly trimming in mid-precision voltage reference designs |
| Low dynamic impedance | 22 Ω at 6.0 mA - maintains regulation accuracy even with ±10% load current variation |
Applications
| Industrial Power Supply Regulation | Automotive Engine Control Unit Reference |
|---|---|
Use Scenario: Stabilizing 43 V auxiliary rail in programmable logic controller (PLC) backplane power distribution. IC Role / Device Role / Timing Role: Two-terminal shunt regulator maintaining constant voltage despite input ripple and load transients. Use Value: Prevents brownout resets by holding rail within ±2% over −40 °C to +85 °C ambient with no active feedback loop. | Use Scenario: Providing temperature-stable 43 V reference for knock sensor signal conditioning in gasoline direct injection ECUs. IC Role / Device Role / Timing Role: Precision voltage clamp defining upper limit of analog front-end input range. Use Value: Ensures ADC full-scale alignment remains invariant across −40 °C to +125 °C engine bay temperatures. |
| Downhole Oilfield Instrumentation | Medical Imaging Detector Bias |
Use Scenario: Regulating bias voltage for piezoelectric transducers in borehole seismic tools exposed to 150 °C wellbore temperatures. IC Role / Device Role / Timing Role: High-temperature Zener reference enabling accurate gain calibration of analog signal chains. Use Value: Maintains 43 V regulation within ±6% over full −65 °C to +175 °C range without derating penalties. | Use Scenario: Generating stable bias for avalanche photodiode (APD) arrays in PET scanner detector modules. IC Role / Device Role / Timing Role: Low-noise, low-capacitance voltage reference setting APD reverse-bias operating point. Use Value: Reduces dark current drift by 40% compared to plastic-packaged Zeners due to hermetic glass seal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4755A-TR | Same 43 V ±5%, DO-41 axial package (not surface-mount); higher thermal resistance (130 °C/W vs. 50 °C/W junction-to-end-cap) | Requires through-hole mounting and larger board area; unsuitable for high-density SMT assemblies | Select only if legacy DO-41 footprint compatibility is mandatory and thermal performance margin is available |
| SMAJ4755A | Same 43 V ±5%, SMA package; 1.0 W rating but lower surge current rating (1500 mA vs. 1500 mA peak, same value but different pulse definition) | Plastic body lacks hermeticity and radiation hardness; not qualified for aerospace or downhole use | Prefer for cost-sensitive consumer applications where glass MELF reliability is unnecessary |
Compared with 1N4755A-TR and SMAJ4755A, the 1N4755UR-1/TR uniquely combines surface-mount DO-213AB geometry, hermetic glass sealing, and verified radiation hardness-making it the only choice for high-reliability, high-temperature, and space-constrained Zener regulation where long-term parametric stability is non-negotiable.
Availability
1N4755UR-1/TR is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive engine control unit reference, and downhole oilfield instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N4755UR-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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N4755UR-1/TR belongs to Microsemi's surface-mount glass Zener diode family, engineered specifically for applications demanding hermetic sealing, wide temperature operation, and radiation tolerance-such as avionics, downhole tools, and medical imaging systems.
FAQ
What is the Zener voltage tolerance of the 1N4755UR-1/TR?
The 1N4755UR-1/TR has a Zener voltage tolerance of ±5%, indicated by the "A" suffix in its designation. This is confirmed in the Electrical Characteristics table on page 2 of the Microsemi datasheet, where VZ = 43 V is specified at IZT = 6.0 mA with ±5% limits. The "UR" prefix denotes the DO-213AB surface-mount variant, and the "TR" suffix indicates tape-and-reel packaging.
Does the 1N4755UR-1/TR require special ESD handling during assembly?
No, the 1N4755UR-1/TR is explicitly stated as nonsensitive to ESD in the Applications/Benefits section of the datasheet. Its glass MELF construction and internal structure eliminate the need for static-safe workstations or ionizers during standard SMT placement and reflow, reducing process complexity and cost in high-volume manufacturing of the 1N4755UR-1/TR.
What is the maximum steady-state power dissipation for the 1N4755UR-1/TR at 25 °C ambient?
The 1N4755UR-1/TR is rated for 1.00 W steady-state power dissipation at TEC < 125 °C or at TA < 45 °C when mounted on an FR4 board with 1 oz copper and the recommended footprint. At 25 °C ambient, full 1.0 W operation is permissible only if end-cap temperature remains below 125 °C-verified via thermal derating curve in Figure 1 of the 1N4755UR-1/TR datasheet.
How does the DO-213AB package of the 1N4755UR-1/TR differ from the DO-41 package used in through-hole variants?
The DO-213AB package of the 1N4755UR-1/TR is a leadless, cylindrical glass MELF case optimized for surface mounting, whereas DO-41 is an axial-leaded plastic package. DO-213AB offers lower thermal resistance (50 °C/W junction-to-end-cap vs. 130 °C/W junction-to-ambient for DO-41), hermetic sealing, and radiation hardness-key distinctions confirmed in the Mechanical and Packaging section for the 1N4755UR-1/TR.
Is the 1N4755UR-1/TR RoHS compliant?
Yes, the 1N4755UR-1/TR is RoHS compliant, as indicated by the "e3" suffix referenced throughout the datasheet (e.g., "1N4728UR thru 1N4764AUR,e3"). The terminals use RoHS-compliant annealed matte-tin plating, and the device meets JEDEC standards for lead-free soldering with 260 °C / 10 s maximum exposure-fully documented in the Mechanical and Packaging section of the 1N4755UR-1/TR datasheet.
1N4755UR-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):
- 43 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 32.7 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)
1N4755UR-1/TR FAQ
1.How can I place an order for 1N4755UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4755UR-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 1N4755UR-1/TR reliable?
The price and inventory of 1N4755UR-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 1N4755UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4755UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4755UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4755UR-1/TR?
1N4755UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4755UR-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 1N4755UR-1/TR?
For technical support, including 1N4755UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4755UR-1/TR requirements.
6.How does Aetrix verify that 1N4755UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4755UR-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 1N4755UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4755UR-1/TR?
All 1N4755UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4755UR-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 1N4755UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4755UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4755UR-1/TR Tags
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