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Microchip Technology 1N4734AUR/TR
- Part No.:
- 1N4734AUR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4734AUR/TR.pdf
- Description:
- DIODE ZENER 5.6V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,286
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Product details
Overview
1N4734AUR/TR from Microsemi is a surface-mount 1.0 W glass-encapsulated Zener diode with a nominal Zener voltage of 5.6 V ±5%, 45 mA test current, 5 Ω dynamic impedance at IZT, 10 μA maximum reverse leakage at 4.2 V, and operating temperature range of −65 °C to +175 °C. It delivers stable voltage regulation in compact high-density power supply rails and reference circuits.
For engineers reviewing the 1N4734AUR/TR datasheet, 1N4734AUR/TR pinout, 1N4734AUR/TR application, or 1N4734AUR/TR equivalent, key selection criteria include its DO-213AB MELF glass package, hermetic sealing for reliability-critical environments, tight thermal resistance (130 °C/W on FR4), and compatibility with automated SMT assembly per EIA-481-B tape-and-reel packaging.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable 5.6 V reference across load and line variations. Its glass hermetic construction ensures low moisture ingress and long-term parameter stability under thermal cycling and high-reliability stress conditions.
Designed for surface mounting, it replaces axial DO-41 equivalents while delivering identical electrical behavior to the legacy 1N4734A series. The device exhibits a sharp knee at 0.25 mA test current (ZZK = 400 Ω), enabling precise low-current regulation without significant voltage droop.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.6 V ±5% - defines regulated output voltage under nominal 45 mA bias; critical for precision reference design |
| Power Dissipation | 1.0 W at TEC < 125 °C - sets maximum continuous thermal load on end cap; requires thermal pad layout per spec |
| Dynamic Impedance (ZZT) | 5 Ω @ 45 mA - indicates low AC impedance for minimal output voltage variation under ripple or transient load changes |
| Reverse Leakage Current | 10 μA max @ 4.2 V - ensures low quiescent power loss in standby or low-power regulation modes |
| Operating Temperature | −65 °C to +175 °C - supports deployment in aerospace, downhole, and industrial control environments |
| Thermal Resistance | 130 °C/W junction-to-ambient on FR4 (1 oz Cu) - determines required PCB copper area for safe derating |
| Forward Voltage | 1.2 V max @ 200 mA - relevant for reverse-polarity protection or dual-use as clamp diode |
Pinout & Package
Package: DO-213AB glass MELF (Miniature External Leadless Flat) - hermetically sealed, leadless cylindrical body with cathode band marking; dimensions: Ø2.39–2.66 mm × 4.80–5.20 mm length; compatible with standard SMT reflow profiles (260 °C/10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection point | Must be biased positive relative to anode to enter regulation; band identifies polarity for correct orientation during placement |
| Anode (unbanded end) | Zener cathode connection point | Connected to circuit ground or lower potential node; forms reference return path for regulation current |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture-induced parameter drift and enables operation up to +175 °C ambient |
| JEDEC-compliant DO-213AB outline | Ensures mechanical compatibility with standard SMT pick-and-place nozzles and reflow footprints |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU; tin-plated terminals solderable per MIL-STD-750 Method 2026 |
| ESD-nonsensitive design | No special handling required; withstands typical board-level ESD events without parameter shift |
| Tape-and-reel packaging (TR) | 12 mm carrier tape, 1500 units per 7-inch reel - optimized for high-volume automated assembly |
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: Zener diode providing fixed 5.6 V reference for optocoupler-based error amplifier input. Use Value: Maintains ±1% output regulation over −40 °C to +105 °C ambient due to low tempco and hermetic stability. |
Use Scenario: Overvoltage protection on avionics sensor signal lines exposed to lightning-induced transients. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage to 5.6 V during surge events exceeding 200 V. Use Value: Withstands 810 mA peak surge current (IS) without degradation, verified per MIL-PRF-19500 screening options. |
| Downhole Oilfield Instrumentation | Medical Diagnostic Equipment Reference |
Use Scenario: Providing stable bias voltage for pressure transducer amplifiers in borehole tools operating at 150 °C. IC Role / Device Role / Timing Role: High-temperature Zener reference replacing less stable silicon alternatives. Use Value: Guaranteed operation to +175 °C with <100 ppm/°C Zener voltage drift - validated by MicroNote 050 radiation-hardness data. |
Use Scenario: Precision analog front-end reference in portable ultrasound imaging systems requiring low-noise bias. IC Role / Device Role / Timing Role: Low-impedance 5.6 V source for ADC reference buffer and op-amp bias networks. Use Value: 5 Ω dynamic impedance minimizes noise coupling into sensitive analog signal paths during switching regulator operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4734A-T | Same 5.6 V ±5%, but in DO-41 axial package; higher thermal resistance (50 °C/W junction-to-lead vs. 130 °C/W junction-to-ambient) | Requires through-hole mounting and manual assembly; unsuitable for high-density SMT layouts | Select when legacy board design prohibits SMT or when lead-forming flexibility is needed |
| SMAJ4734A | Same electrical specs, but in SMA package; plastic body, non-hermetic; rated only to +150 °C | Lacks radiation hardness and long-term hermetic stability; not qualified for aerospace or downhole use | Select for cost-sensitive consumer applications where full MIL-grade reliability is unnecessary |
Compared with 1N4734A-T and SMAJ4734A, the 1N4734AUR/TR uniquely combines SMT compatibility, hermetic glass construction, +175 °C operation, and JEDEC DO-213AB compliance-making it the only choice for high-reliability, high-temperature, high-density Zener regulation.
Availability
1N4734AUR/TR is available at Aetrix Electronics and suitable for industrial power supplies, aerospace clamping circuits, downhole instrumentation, and medical diagnostic equipment requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for 1N4734AUR/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-temperature analog and mixed-signal components.
The 1N4734AUR/TR belongs to Microsemi's surface-mount Zener diode family designed specifically for mission-critical applications demanding hermetic sealing, wide temperature operation, and MIL-qualified screening options.
FAQ
What is the Zener voltage tolerance for 1N4734AUR/TR?
The 1N4734AUR/TR has a nominal Zener voltage of 5.6 V with a tolerance of ±5%, indicated by the "A" suffix in the part number. This tolerance is guaranteed over the full operating temperature range of −65 °C to +175 °C and applies under specified test conditions (45 mA, 30 °C junction temperature). Tighter tolerances (±2% or ±1%) require C or D suffix variants, which are not applicable to the 1N4734AUR/TR.
Can 1N4734AUR/TR replace through-hole 1N4734A in existing designs?
The 1N4734AUR/TR provides identical electrical performance to the axial 1N4734A but uses a DO-213AB MELF surface-mount package instead of DO-41. Direct replacement requires PCB redesign to accommodate the cylindrical SMT footprint and reflow process. Thermal performance differs significantly: 1N4734AUR/TR has 130 °C/W junction-to-ambient on FR4, whereas 1N4734A relies on lead conduction (50 °C/W junction-to-lead). Layout and thermal validation are mandatory before substitution.
Is 1N4734AUR/TR RoHS compliant?
Yes, the "e3" suffix in the full designation 1N4734AUR/TR/e3 confirms RoHS compliance per EU Directive 2011/65/EU. The terminals feature annealed matte-tin plating, solderable per MIL-STD-750 Method 2026, and the glass body contains no restricted substances above threshold limits. Aetrix Electronics guarantees full compliance documentation upon request for 1N4734AUR/TR shipments.
What is the maximum surge current rating for 1N4734AUR/TR?
The 1N4734AUR/TR is rated for a maximum non-repetitive reverse surge current (IS) of 810 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating enables robust transient suppression in clamp applications. Derating is required above 25 °C ambient; the device maintains surge capability up to +125 °C junction temperature per Microsemi's published derating curves.
Does 1N4734AUR/TR require special ESD handling?
No, the 1N4734AUR/TR is explicitly characterized as nonsensitive to ESD per Microsemi's datasheet. It does not require static-safe packaging, wrist straps, or ionized workstations during handling or assembly. This property stems from its glass-encapsulated structure and robust junction design, making it suitable for standard SMT production lines without additional ESD controls beyond general industry practice.
1N4734AUR/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:
- ±5%
- 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)
1N4734AUR/TR FAQ
1.How can I place an order for 1N4734AUR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4734AUR/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 1N4734AUR/TR reliable?
The price and inventory of 1N4734AUR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4734AUR/TR is usually 5 days.
3.What payment methods are accepted for 1N4734AUR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4734AUR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4734AUR/TR?
1N4734AUR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4734AUR/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 1N4734AUR/TR?
For technical support, including 1N4734AUR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4734AUR/TR requirements.
6.How does Aetrix verify that 1N4734AUR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4734AUR/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 1N4734AUR/TR meets industry standards.
7.What is the process for return or replacement of 1N4734AUR/TR?
All 1N4734AUR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4734AUR/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 1N4734AUR/TR part is unused and in its original packaging.
Return procedure for 1N4734AUR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4734AUR/TR Tags
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