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Microchip Technology 1N4733AURE3/TR
- Part No.:
- 1N4733AURE3/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4733AURE3/TR.pdf
- Description:
- DIODE ZENER 5.1V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:168
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Product details
Overview
1N4733AURE3/TR from Microsemi is a surface-mount 1.0 W glass Zener diode with nominal Zener voltage 5.1 V, ±5% tolerance (A suffix), 7 Ω dynamic impedance at 49 mA test current, and maximum reverse leakage of 10 μA at 1 V. It operates from –65 °C to +175 °C and is used for precision voltage regulation in power supply feedback loops, reference circuits, and overvoltage protection.
For engineers reviewing the 1N4733AURE3/TR datasheet, 1N4733AURE3/TR pinout, 1N4733AURE3/TR application, or 1N4733AURE3/TR equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (130 °C/W on FR4), surge current rating (890 mA), low capacitance, and RoHS-compliant matte-tin plating.
Technical Context
This device implements a single-junction Zener breakdown mechanism in a hermetically sealed DO-213AB glass MELF package. Its regulation behavior is defined by sharp knee impedance (7 Ω at IZT = 49 mA) and stable Zener voltage across –65 °C to +175 °C operating range.
It delivers 1.0 W steady-state power dissipation at TC < 125 °C or TA < 45 °C on FR4 with recommended pad layout, and supports solder reflow up to 260 °C for 10 s. Forward voltage is ≤1.2 V at 200 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V ±5% - precise regulation point for 5 V rail monitoring and feedback |
| Power Dissipation | 1.0 W at TC < 125 °C - enables compact thermal design without heatsinking |
| Dynamic Impedance (ZZT) | 7 Ω @ 49 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage Current | 10 μA @ 1 V - guarantees low quiescent current in standby regulation paths |
| Operating Temperature | –65 °C to +175 °C - suitable for under-hood automotive and industrial environments |
| Thermal Resistance | 130 °C/W junction-to-ambient on FR4 - informs PCB copper area requirements for thermal management |
| Surge Current (IS) | 890 mA - withstands short-duration overvoltage events per ½-sine pulse standard |
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).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection during reverse bias | Must be held positive relative to anode for regulation; band identifies polarity for automated placement |
| Anode (unbanded end) | Zener cathode connection during reverse bias | Connected to circuit ground or lower potential node; determines forward conduction direction |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Enables operation in high-reliability, radiation-hardened, and moisture-sensitive environments per MicroNote 050 |
| RoHS-compliant matte-tin plating | Ensures reliable solderability per MIL-STD-750 Method 2026 and compatibility with lead-free assembly |
| Tight Zener voltage tolerance | ±5% (A suffix) provides predictable regulation without post-production trimming |
| Low dynamic impedance | 7 Ω at 49 mA maintains stable output under varying load conditions in feedback networks |
| High-temperature capability | Rated to +175 °C junction temperature supports under-hood and downhole applications |
Applications
| Power Supply Feedback Regulation | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing output voltage in isolated DC-DC converter feedback loops using optocoupler-coupled TL431 alternatives. IC Role / Device Role / Timing Role: Zener reference element providing precise 5.1 V threshold for error amplifier biasing. Use Value: Enables ±1% output regulation accuracy without external trimming, leveraging 7 Ω dynamic impedance and low tempco. | Use Scenario: Protecting microcontroller I/O pins from transient voltage spikes on 5 V logic rails. IC Role / Device Role / Timing Role: Shunt clamping device diverting excess energy above 5.1 V to ground. Use Value: Absorbs 890 mA surge pulses without degradation, supported by 1.0 W power rating and robust glass package. |
| Reference Voltage Source | Temperature-Stable Bias Generator |
Use Scenario: Generating stable 5.1 V reference for ADC voltage dividers in industrial sensor signal conditioning. IC Role / Device Role / Timing Role: Primary voltage reference with minimal drift over –40 °C to +85 °C ambient. Use Value: Delivers <10 μA leakage at 1 V and tight ±5% initial tolerance-reducing calibration overhead. | Use Scenario: Establishing bias points for op-amp input stages in wide-temperature-range instrumentation amplifiers. IC Role / Device Role / Timing Role: Temperature-compensated Zener node supplying stable current to active circuitry. Use Value: Maintains regulation integrity from –65 °C to +175 °C, critical for aerospace and oilfield electronics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A-T | Same 5.1 V ±5%, DO-41 through-hole package; higher thermal resistance (50 °C/W junction-to-end-cap vs. 130 °C/W junction-to-ambient) | Requires axial-leaded PCB layout and manual or wave soldering; unsuitable for high-density SMT designs | Select when legacy through-hole assembly or higher peak power handling (via heatsinked end cap) is required |
| SMAJ4733A | Same electrical specs but in SMA package; 1.5× larger footprint, lower surge rating (500 mA vs. 890 mA), same 1 W rating | Less effective for high-energy transients; requires larger board area and different reflow profile due to plastic body | Select only if SMA footprint compatibility is mandatory and surge margin is not critical |
Compared with 1N4733A-T and SMAJ4733A, the 1N4733AURE3/TR offers superior thermal performance on FR4 (130 °C/W), smallest board footprint (DO-213AB), highest surge current (890 mA), and hermetic reliability-making it optimal for space-constrained, high-reliability SMT applications.
Availability
1N4733AURE3/TR is available at Aetrix Electronics and suitable for power supply feedback regulation, overvoltage protection clamping, and precision reference voltage generation requiring stable component supply across automotive, industrial control, and aerospace programs.
Supply support for 1N4733AURE3/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, RF, and timing solutions for defense, aerospace, and industrial markets.
The 1N4733AURE3/TR belongs to Microsemi's surface-mount Zener diode family designed for high-density, low-parasitic voltage regulation in harsh-environment electronics where hermetic sealing and radiation hardness are essential.
FAQ
What is the Zener voltage tolerance of the 1N4733AURE3/TR?
The 1N4733AURE3/TR has a nominal Zener voltage of 5.1 V with ±5% tolerance, indicated by the "A" suffix per Microsemi documentation. This tolerance is verified at 30 °C with 90-second stabilization after DC current application and applies across the full operating temperature range of –65 °C to +175 °C.
Is the 1N4733AURE3/TR RoHS compliant?
Yes, the 1N4733AURE3/TR is RoHS compliant, confirmed by the "e3" suffix in its part number and Microsemi's specification stating RoHS-compliant annealed matte-tin plating per MIL-STD-750 Method 2026. It meets lead-free soldering requirements with a 260 °C/10 s reflow profile.
What package type does the 1N4733AURE3/TR use?
The 1N4733AURE3/TR uses the DO-213AB glass MELF package - a hermetically sealed, cylindrical, leadless surface-mount outline with cathode band marking. Its dimensions are length 2.39–2.66 mm and diameter 4.80–5.20 mm, optimized for high-density placement and low parasitic inductance.
How much surge current can the 1N4733AURE3/TR withstand?
The 1N4733AURE3/TR withstands a maximum surge current of 890 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating is specified in the Electrical Characteristics table and reflects its capability to absorb transient overvoltage events without degradation.
What is the thermal resistance of the 1N4733AURE3/TR on FR4 PCB?
The 1N4733AURE3/TR has a thermal resistance of 130 °C/W junction-to-ambient when mounted on FR4 with 1 oz copper and Microsemi's recommended footprint. This value governs power derating above 45 °C ambient and informs minimum copper pour area needed for sustained 1.0 W operation.
1N4733AURE3/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):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 1 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)
1N4733AURE3/TR FAQ
1.How can I place an order for 1N4733AURE3/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4733AURE3/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 1N4733AURE3/TR reliable?
The price and inventory of 1N4733AURE3/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4733AURE3/TR is usually 5 days.
3.What payment methods are accepted for 1N4733AURE3/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4733AURE3/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4733AURE3/TR?
1N4733AURE3/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4733AURE3/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 1N4733AURE3/TR?
For technical support, including 1N4733AURE3/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4733AURE3/TR requirements.
6.How does Aetrix verify that 1N4733AURE3/TR is sourced from the original manufacturer or authorized distributors?
All 1N4733AURE3/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 1N4733AURE3/TR meets industry standards.
7.What is the process for return or replacement of 1N4733AURE3/TR?
All 1N4733AURE3/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4733AURE3/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 1N4733AURE3/TR part is unused and in its original packaging.
Return procedure for 1N4733AURE3/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4733AURE3/TR Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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