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Microchip Technology 1N4734UR-1/TR
- Part No.:
- 1N4734UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4734UR-1/TR.pdf
- Description:
- DIODE ZENER 5.6V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,510
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Product details
Overview
1N4734UR-1/TR from Microsemi is a surface-mount 1.0 W glass Zener diode with nominal Zener voltage 5.6 V, ±5% tolerance (A-suffix), 45 mA test current (IZT), 5 Ω dynamic impedance (ZZT), and 10 μA maximum reverse leakage at 4.2 V (VR). 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 1N4734UR-1/TR datasheet, 1N4734UR-1/TR pinout, 1N4734UR-1/TR application, or 1N4734UR-1/TR equivalent, key selection criteria include Zener voltage stability over temperature, low dynamic impedance for tight regulation, hermetic DO-213AB glass MELF package suitability for high-reliability environments, and RoHS-compliant (e3) termination options.
Technical Context
This device belongs to Microsemi's 1N47xxAUR family of surface-mount Zener diodes, electrically equivalent to through-hole 1N47xxA parts but packaged in JEDEC DO-213AB glass MELF. It delivers stable voltage regulation across 1 mA to 162 mA operating current (IZM = 162 mA at TA = 50°C), with sharp breakdown knee characterized by ZZK = 400 Ω at IZK = 1.0 mA.
The 1N4734UR-1/TR uses a hermetically sealed glass construction enabling inherent radiation hardness per MicroNote 050 and operation up to +175°C junction temperature. Its thermal resistance is 130°C/W junction-to-ambient on FR4 with recommended footprint, supporting reliable performance in thermally constrained industrial and aerospace designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.6 V ±5% - precise regulation setpoint for feedback networks and voltage references |
| Power Dissipation | 1.0 W at TC ≤ 125°C - supports continuous operation in compact, unheatsinked layouts |
| Test Current (IZT) | 45 mA - standardized bias point for measuring VZ and dynamic impedance |
| Dynamic Impedance (ZZT) | 5 Ω @ IZT - low AC resistance ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | 10 μA max @ VR = 4.2 V - guarantees low quiescent current in standby and low-power modes |
| Operating Temperature | –65°C to +175°C - validated for extended-range industrial, avionics, and downhole applications |
| Forward Voltage (VF) | 1.2 V max @ 200 mA - defines conduction loss when used in bidirectional protection or clamp configurations |
Pinout & Package
Package: DO-213AB glass MELF (hermetically sealed, leadless cylindrical surface-mount package with cathode band marking).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection during reverse-bias regulation | Must be held positive relative to anode to achieve 5.6 V breakdown; polarity critical for correct regulation |
| Anode (unbanded end) | Zener cathode connection during reverse-bias regulation | Connected to circuit ground or lower-potential node; forms regulated output reference point |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Enables operation up to +175°C and intrinsic radiation hardness per MicroNote 050 |
| Low dynamic impedance (5 Ω) | Minimizes output voltage deviation under varying load currents in feedback paths |
| ±5% Zener voltage tolerance (A-suffix) | Meets standard precision requirements without requiring post-manufacture trimming |
| RoHS-compliant (e3) matte-tin plating | Supports lead-free reflow soldering at 260°C for 10 s without degradation |
| DO-213AB mechanical outline | Provides high-density mounting capability with reduced parasitic inductance vs. axial leads |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converter feedback loops using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Zener reference element setting precise 5.6 V threshold for TL431-type shunt regulators or discrete error amplifiers. Use Value: Stable 5.6 V reference enables <±1% output regulation across line, load, and temperature with minimal external components. |
Use Scenario: Providing stable excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage reference source for ratiometric measurement front-ends. Use Value: Hermetic glass construction ensures long-term stability and repeatability in harsh factory-floor environments. |
| Aerospace Voltage Clamp | High-Temperature Motor Control |
Use Scenario: Overvoltage protection clamping on avionics bus lines subject to lightning-induced transients. IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing surge energy while maintaining system-level voltage integrity. Use Value: Radiation-hardened glass body and –65°C to +175°C rating support DO-160 compliance in airborne systems. |
Use Scenario: Gate drive voltage stabilization for IGBTs in oil-field motor drives operating near engine blocks. IC Role / Device Role / Timing Role: Local 5.6 V rail regulator supplying isolated gate driver ICs in high-ambient-temperature enclosures. Use Value: 130°C/W thermal resistance on FR4 allows direct PCB mounting without heatsinks in space-constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4734A | Same electrical specs (5.6 V, ±5%, 1 W), but DO-41 axial-leaded package | Requires through-hole mounting; higher parasitic inductance; unsuitable for high-density SMT layouts | Select when legacy board compatibility or manual prototyping is prioritized over miniaturization |
| SMAJ4734A | Same Zener voltage and tolerance, but SMA package (plastic, not glass); 1.0 W Pd; higher capacitance (~50 pF vs. ~3 pF) | Lower cost and wider availability, but lacks radiation hardness and high-temperature endurance | Select for commercial-grade consumer electronics where cost and volume outweigh reliability requirements |
Compared with 1N4734A and SMAJ4734A, the 1N4734UR-1/TR uniquely combines hermetic glass MELF packaging, radiation hardness, and extended temperature range-making it the only choice for mission-critical, high-reliability SMT voltage regulation where environmental robustness is non-negotiable.
Availability
1N4734UR-1/TR is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, aerospace clamping circuits, and high-temperature motor control systems requiring stable component supply and long-term sourcing continuity.
Supply support for 1N4734UR-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 1N4734UR-1/TR belongs to Microsemi's surface-mount Zener diode product line, engineered specifically for high-density, high-temperature, and radiation-tolerant voltage regulation in mission-critical systems.
FAQ
What is the Zener voltage tolerance of the 1N4734UR-1/TR?
The 1N4734UR-1/TR has a nominal Zener voltage of 5.6 V with ±5% tolerance, indicated by the "A" suffix in its designation. This tolerance is verified at 30°C with 45 mA test current (IZT) and applies across the full operating temperature range of –65°C to +175°C, ensuring predictable regulation in demanding environments.
Is the 1N4734UR-1/TR RoHS compliant?
Yes, the 1N4734UR-1/TR carries the "e3" suffix, confirming RoHS compliance with matte-tin plating that meets MIL-STD-750 Method 2026 solderability requirements. It supports lead-free reflow profiles up to 260°C for 10 seconds, making it suitable for modern environmentally regulated manufacturing.
What package type does the 1N4734UR-1/TR use?
The 1N4734UR-1/TR uses the JEDEC DO-213AB glass MELF package-a hermetically sealed, leadless cylindrical surface-mount outline. Its dimensions are 2.39–2.66 mm diameter (A) and 4.80–5.20 mm length (B), optimized for high-density placement and low parasitic inductance in precision analog circuits.
How does the 1N4734UR-1/TR differ from the through-hole 1N4734A?
The 1N4734UR-1/TR matches the 1N4734A electrically (5.6 V, ±5%, 1 W), but replaces the DO-41 axial package with DO-213AB glass MELF. This enables surface-mount assembly, reduces board area, lowers parasitics, and extends operational temperature range to +175°C-critical for aerospace and downhole applications where the 1N4734A cannot perform.
What is the maximum steady-state current for the 1N4734UR-1/TR at 50°C ambient?
At TA = 50°C, the 1N4734UR-1/TR supports a maximum regulator current (IZM) of 162 mA. This value is derived from its 1.0 W power rating and thermal resistance of 130°C/W on FR4 with recommended pad layout, ensuring safe operation without derating in typical industrial ambient conditions.
1N4734UR-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):
- 5.6 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 2 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)
1N4734UR-1/TR FAQ
1.How can I place an order for 1N4734UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4734UR-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 1N4734UR-1/TR reliable?
The price and inventory of 1N4734UR-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 1N4734UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4734UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4734UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4734UR-1/TR?
1N4734UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4734UR-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 1N4734UR-1/TR?
For technical support, including 1N4734UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4734UR-1/TR requirements.
6.How does Aetrix verify that 1N4734UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4734UR-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 1N4734UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4734UR-1/TR?
All 1N4734UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4734UR-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 1N4734UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4734UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4734UR-1/TR Tags
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MM5Z5V1ST1G
onsemi
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