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Microchip Technology 1N4755AUR/TR
- Part No.:
- 1N4755AUR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4755AUR/TR.pdf
- Description:
- DIODE ZENER 43V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,582
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Product details
Overview
1N4755AUR/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), 6.0 mA test current (IZT), 70 Ω dynamic impedance (ZZT) at IZT, and 22 μA maximum reverse leakage at 32.7 V. It operates from –65 °C to +175 °C and is used for precision voltage regulation in high-density power supply feedback loops and reference circuits.
For engineers reviewing the 1N4755AUR/TR datasheet, 1N4755AUR/TR pinout, 1N4755AUR/TR application, or 1N4755AUR/TR equivalent, key selection criteria include its DO-213AB glass MELF package, hermetic sealing, low parasitic capacitance, radiation hardness per MicroNote 050, and compatibility with automated SMT assembly under JEDEC-compliant reflow profiles.
Technical Context
This Zener diode functions as a two-terminal voltage reference device operating in reverse breakdown. Its regulation performance is defined at TC = 30 °C with specified Zener voltage (43 V), dynamic impedance (70 Ω), and knee impedance (110 Ω at 0.25 mA), ensuring stable clamping across load and temperature variations.
The device uses a hermetically sealed glass MELF (DO-213AB) construction with tin-lead or RoHS-compliant matte-tin plating. Polarity is marked by a cathode band; operation requires the banded end to be positive relative to the anode during Zener conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V ±5% - precise regulation point for feedback networks requiring tight voltage references. |
| Power Dissipation | 1.0 W at TEC < 125 °C - supports continuous operation in compact thermal environments with proper end-cap heatsinking. |
| Test Current (IZT) | 6.0 mA - standard bias condition for measuring VZ; defines optimal regulation zone for stable output. |
| Dynamic Impedance (ZZT) | 70 Ω @ IZT - low AC impedance ensures minimal voltage shift under varying load currents. |
| Reverse Leakage (IR) | 22 μA @ 32.7 V - low leakage preserves accuracy in high-impedance reference paths and low-power standby modes. |
| Operating Temperature | –65 °C to +175 °C - enables use in aerospace, downhole, and industrial systems with extreme ambient conditions. |
| Forward Voltage | ≤1.2 V @ 200 mA - ensures predictable forward conduction behavior during transient overvoltage events. |
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 (length), B = 4.80–5.20 mm (diameter), C = 0.41–0.55 mm (band width). Mounting pad layout per Microsemi-recommended footprint on FR4 with 1 oz Cu.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher-potential side in Zener mode; defines reference voltage at this terminal relative to anode. |
| Anode (unbanded end) | Reference ground/reference return | Serves as circuit common; voltage drop across diode is measured from cathode to this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift; supports MIL-PRF-19500 screening options (JAN/JANTXV). |
| Radiation hardness (MicroNote 050) | Inherent tolerance to total ionizing dose (TID), enabling use in space-grade and nuclear instrumentation applications. |
| Low dynamic impedance (70 Ω) | Minimizes output voltage variation under dynamic load changes-critical for closed-loop regulator stability. |
| RoHS-compliant option (e3 suffix) | Meets environmental compliance without sacrificing electrical or thermal performance; compatible with Pb-free reflow. |
| Nonsensitive to ESD | Withstands handling without special precautions-reduces manufacturing yield loss in high-volume SMT lines. |
Applications
| Industrial Power Supply Feedback | Aerospace Voltage Reference |
|---|---|
|
Use Scenario: Regulating output voltage in isolated DC-DC converters using optocoupler-coupled feedback loops. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold in secondary-side regulation. Use Value: 43 V rating allows direct use with common 48 V bus-derived auxiliary supplies; ±5% tolerance ensures consistent loop gain across production units. |
Use Scenario: Providing stable bias voltage for radiation-hardened op-amps and comparators in satellite telemetry circuits. IC Role / Device Role / Timing Role: Precision shunt reference establishing known voltage thresholds for analog signal conditioning. Use Value: Hermetic glass package and radiation hardness per MicroNote 050 ensure long-term parametric stability in orbit environments. |
| Downhole Instrumentation Clamp | High-Temperature Motor Control |
|
Use Scenario: Overvoltage protection and rail clamping in sensor front-ends deployed in oil/gas well logging tools. IC Role / Device Role / Timing Role: Transient voltage suppressor and steady-state clamp limiting input to downstream ADC drivers. Use Value: –65 °C to +175 °C operating range matches downhole thermal profiles; low leakage prevents signal corruption at elevated temperatures. |
Use Scenario: Stabilizing gate drive reference voltages in IGBT-based inverters operating inside engine compartments. IC Role / Device Role / Timing Role: Shunt regulator maintaining fixed bias for isolated gate driver ICs under thermal cycling. Use Value: 1.0 W power rating and 130 °C/W thermal resistance on FR4 allow reliable operation without heatsinks at 105 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4755A | Same electrical specs but in axial DO-41 package; no tape-and-reel (TR) option; not surface mountable. | Requires through-hole PCB assembly; unsuitable for high-density or automated SMT lines. | Select 1N4755AUR/TR when board space, automated placement, or thermal performance on FR4 is critical. |
| SMAJ4755A | Same Zener voltage and tolerance, but in SMA package; higher thermal resistance (150 °C/W); rated for 1.5 W peak pulse only. | Designed for surge suppression, not continuous regulation; less stable long-term voltage drift than glass MELF. | Choose 1N4755AUR/TR for precision DC regulation; use SMAJ4755A only for transient clamping where average power is low. |
Compared with 1N4755A and SMAJ4755A, the 1N4755AUR/TR delivers superior long-term stability, lower leakage, and better thermal performance in continuous regulation roles due to its hermetic glass MELF construction and optimized FR4 mounting thermal path.
Availability
1N4755AUR/TR is available at Aetrix Electronics and suitable for industrial power supply feedback, aerospace voltage reference, downhole instrumentation clamp, and high-temperature motor control applications requiring stable component supply, high reliability, and SMT manufacturability.
Supply support for 1N4755AUR/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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets, emphasizing radiation tolerance, hermetic packaging, and extended temperature operation.
The 1N4755AUR/TR belongs to Microsemi's surface-mount Zener diode family engineered for high-density voltage regulation where long-term stability, low leakage, and extreme temperature resilience are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4755AUR/TR?
The "A" suffix in 1N4755AUR/TR specifies a ±5% tolerance on the nominal 43 V Zener voltage. This is confirmed in the Electrical Characteristics table (Page 2) and Note 1 of the datasheet. Tighter tolerances (±2%, ±1%) are available with "C" or "D" suffixes, but 1N4755AUR/TR strictly adheres to ±5%. The tolerance directly impacts regulation accuracy in feedback networks.
Is 1N4755AUR/TR RoHS compliant?
Yes-1N4755AUR/TR is RoHS compliant when ordered with the "e3" suffix (e.g., 1N4755AUR/TR-e3), as stated in the FEATURES section. The base part number does not imply RoHS status; compliance requires explicit e3 marking. Terminal plating uses annealed matte-tin per MIL-STD-750, method 2026, satisfying lead-free soldering requirements.
What is the maximum steady-state power dissipation for 1N4755AUR/TR?
The 1N4755AUR/TR has a maximum steady-state power dissipation of 1.00 W at end-cap temperature (TEC) < 125 °C or at ambient temperature (TA) < 45 °C when mounted on FR4 with 1 oz copper and the recommended footprint. Derating follows the curve in Figure 1, dropping linearly to zero at 175 °C ambient.
Does 1N4755AUR/TR have radiation hardness certification?
Yes-the 1N4755AUR/TR exhibits inherent radiation hardness per MicroNote 050, a documented Microsemi technical note confirming tolerance to total ionizing dose (TID). This is not a certified MIL-spec qualification but a verified material-level property of the glass MELF construction, making it suitable for low-dose space and nuclear applications.
What is the cathode marking convention for 1N4755AUR/TR?
The cathode of the 1N4755AUR/TR is indicated by a single dark band on the glass MELF body, as shown in the APPEARANCE diagram and stated in the MECHANICAL AND PACKAGING section. During Zener operation, the banded end must be held at a higher potential than the unbanded (anode) end. No alphanumeric marking is present-only the band.
1N4755AUR/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:
- ±5%
- 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)
1N4755AUR/TR FAQ
1.How can I place an order for 1N4755AUR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4755AUR/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 1N4755AUR/TR reliable?
The price and inventory of 1N4755AUR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4755AUR/TR is usually 5 days.
3.What payment methods are accepted for 1N4755AUR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4755AUR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4755AUR/TR?
1N4755AUR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4755AUR/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 1N4755AUR/TR?
For technical support, including 1N4755AUR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4755AUR/TR requirements.
6.How does Aetrix verify that 1N4755AUR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4755AUR/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 1N4755AUR/TR meets industry standards.
7.What is the process for return or replacement of 1N4755AUR/TR?
All 1N4755AUR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4755AUR/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 1N4755AUR/TR part is unused and in its original packaging.
Return procedure for 1N4755AUR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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