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Microchip Technology SMAJ4733E3/TR13
- Part No.:
- SMAJ4733E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4733E3/TR13.pdf
- Description:
- DIODE ZENER 5.1V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,088
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Product details
Overview
SMAJ4733E3/TR13 from SM Semiconductors is a 5.1 V, 5% tolerance Zener diode designed for transient voltage suppression and precision DC voltage regulation in low-power signal paths. It delivers 2.0 W steady-state power dissipation, 49 mA test current (IZT), 7.0 Ω dynamic impedance (ZZT), and operates across –65 °C to +150 °C. Used in I/O protection circuits for microcontroller peripherals.
For engineers reviewing the SMAJ4733E3/TR13 datasheet, SMAJ4733E3/TR13 pinout, SMAJ4733E3/TR13 application, or SMAJ4733E3/TR13 equivalent, key selection criteria include zener voltage tolerance, surge current rating (890 mA), thermal resistance (25 °C/W), and DO-214AC package compatibility with high-density PCB layouts.
Technical Context
This device functions as a silicon planar Zener diode optimized for clamping transients and regulating reference voltages in low-current analog and digital interfaces. Its 5.1 V nominal breakdown voltage is specified at 49 mA (IZT), with sharp knee characteristics confirmed by 1.0 mA knee current (IZK) and 7.0 Ω dynamic impedance measured under AC-superimposed DC conditions.
The SMAJ4733E3/TR13 employs a void-free thermosetting epoxy case (UL94V-0 rated) with cathode band polarity marking and matte-tin plating compliant with MIL-STD-750 Method 2026. Thermal performance is defined by 25 °C/W junction-to-lead resistance, enabling stable operation up to 150 °C ambient when properly mounted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V ±5% at 49 mA - defines precise clamping threshold for 5 V logic rail protection |
| Power Dissipation (PM(AV)) | 2.0 W - supports continuous regulation without heatsink in low-duty-cycle applications |
| Dynamic Impedance (ZZT) | 7.0 Ω at IZT - ensures minimal voltage deviation during load current changes |
| Surge Current (Izsm) | 890 mA - withstands 1/2-sine 120 Hz transients per JEDEC standards |
| Reverse Leakage (IR) | 10 µA max at 1.0 V - guarantees low standby power loss in always-on sensor interfaces |
| Thermal Resistance (RθJL) | 25 °C/W - enables direct lead-mount thermal path for reliable junction temperature control |
| Operating Temperature | –65 °C to +150 °C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mountable, cathode indicated by band, 0.3 g weight, UL94V-0 epoxy body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias | Connected to lower-potential node; used for forward-voltage sensing or dual-direction clamp configurations |
| Cathode | Current exit terminal during reverse breakdown | Marked with band; tied to protected line (e.g., MCU I/O) to clamp overvoltage to 5.1 V |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables tighter regulation margin vs. 10% variants-critical for 5 V supply rail monitoring |
| 2.0 W steady-state power rating | Supports sustained clamping in battery-backed real-time clock or EEPROM backup circuits |
| DO-214AC (SMA) package | Reduces PCB footprint by >40% vs. DO-41; compatible with standard SMT reflow profiles |
| 10 µA max reverse leakage at 1 V | Minimizes quiescent current drain in always-on IoT sensor nodes powered by coin cells |
| UL94V-0 epoxy encapsulation | Meets flammability requirements for enclosed industrial control enclosures and automotive ECUs |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors from ESD and load-dump transients in factory automation PLCs. IC Role / Device Role / Timing Role: Zener clamping diode placed between sensor output and ADC input to limit voltage to 5.1 V. Use Value: Prevents ADC saturation and latch-up during 8 kV contact ESD events per IEC 61000-4-2. | Use Scenario: Regulating reference voltage for LIN bus transceiver biasing in door module ECUs. IC Role / Device Role / Timing Role: Precision 5.1 V shunt regulator supplying stable bias to LIN driver IC. Use Value: Maintains <±2% output accuracy across –40 °C to +125 °C ambient, ensuring LIN signal integrity. |
| Consumer USB-C Port Protection | Telecom DSL Line Interface |
Use Scenario: Clamping VBUS line surges during hot-plug insertion in portable USB-C accessories. IC Role / Device Role / Timing Role: Transient voltage suppressor on 5 V VBUS rail upstream of USB PD controller. Use Value: Absorbs 30 A peak surge (8/20 µs) without degradation, preserving port functionality after repeated events. | Use Scenario: Protecting ADSL line driver outputs from lightning-induced surges on twisted-pair copper loops. IC Role / Device Role / Timing Role: Bidirectional TVS configured with back-to-back SMAJ4733E3/TR13 units across differential pair. Use Value: Limits common-mode transients to <12 V peak, preventing damage to line driver op-amps and transformers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation and transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | DO-41 through-hole package; 5% tolerance; 1.0 W power rating | Requires axial-leaded mounting; unsuitable for high-density SMT designs | Select when legacy through-hole assembly or higher surge energy handling per pulse is required |
| BZX55C5V1 | DO-35 glass package; 5% tolerance; 500 mW power rating; 100 Ω typical ZZT | Limited to low-energy signal-line clamping; not rated for 890 mA surge | Choose only for ultra-low-cost, low-power analog references where space permits larger footprint |
Compared with 1N4733A and BZX55C5V1, the SMAJ4733E3/TR13 offers superior surge robustness (890 mA vs. 500 mA and 100 mA), SMT compatibility, and thermal performance (25 °C/W vs. ~60 °C/W), making it optimal for modern compact, high-reliability designs.
Availability
SMAJ4733E3/TR13 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and consumer USB-C port protection requiring stable component supply and full traceability.
Supply support for SMAJ4733E3/TR13 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
SM Semiconductors is a Taiwan-based manufacturer specializing in discrete semiconductors, including Zener diodes, TVS devices, and rectifiers, with ISO 9001-certified production.
The SMAJ47xxA series targets cost-sensitive, high-volume transient suppression and voltage reference applications across automotive, industrial, and consumer markets, emphasizing reliability in harsh thermal and electrical environments.
FAQ
What is the Zener voltage tolerance of SMAJ4733E3/TR13?
The SMAJ4733E3/TR13 has a nominal Zener voltage of 5.1 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 4.845 V and 5.355 V at 49 mA test current. This tighter tolerance than standard 10% Zeners improves accuracy in voltage-reference and overvoltage-clamp applications. The SMAJ4733E3/TR13 datasheet specifies this tolerance explicitly in Table 1 under the "A" suffix designation.
Does SMAJ4733E3/TR13 meet RoHS requirements?
Yes, SMAJ4733E3/TR13 uses ROHS-compliant annealed matte-tin plating on terminals, as confirmed in the mechanical data section of the official SM Semiconductors datasheet. The device is lead-free and complies with EU RoHS Directive 2011/65/EU, with no exemptions claimed. SMAJ4733E3/TR13 is suitable for use in environmentally regulated consumer and industrial products.
What is the maximum surge current rating for SMAJ4733E3/TR13?
The SMAJ4733E3/TR13 has a maximum peak surge current (Izsm) rating of 890 mA, measured using a 1/2 sine wave pulse of 1/120 second duration at 25 °C ambient. This value is specified in Table 1 of the SM Semiconductors datasheet and reflects capability to absorb repetitive transient energy without parametric shift. SMAJ4733E3/TR13 maintains this rating under proper PCB thermal design.
Can SMAJ4733E3/TR13 be used in bidirectional TVS configurations?
Yes, SMAJ4733E3/TR13 can be used in bidirectional configurations when two units are connected anode-to-anode or cathode-to-cathode. This arrangement provides symmetrical clamping for AC signals or differential lines, such as telecom DSL interfaces. The SMAJ4733E3/TR13's 5.1 V breakdown and 890 mA surge rating make it effective for common-mode surge suppression when paired correctly.
What is the thermal resistance junction-to-lead for SMAJ4733E3/TR13?
The thermal resistance junction-to-lead (RθJL) for SMAJ4733E3/TR13 is 25 °C/W, as stated in the Maximum Ratings table of the SM Semiconductors datasheet. This value assumes direct conduction from die to soldered lead, enabling accurate junction temperature estimation during operation. SMAJ4733E3/TR13 achieves this via its DO-214AC package geometry and internal leadframe design.
SMAJ4733E3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 5.1 V
- Tolerance:
- ±10%
- Power - Max:
- 2 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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC
SMAJ4733E3/TR13 FAQ
1.How can I place an order for SMAJ4733E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4733E3/TR13 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 SMAJ4733E3/TR13 reliable?
The price and inventory of SMAJ4733E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4733E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4733E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4733E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4733E3/TR13?
SMAJ4733E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4733E3/TR13 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 SMAJ4733E3/TR13?
For technical support, including SMAJ4733E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4733E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4733E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4733E3/TR13 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 SMAJ4733E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4733E3/TR13?
All SMAJ4733E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4733E3/TR13, 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 SMAJ4733E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4733E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4733E3/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
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MMSZ5231B-7-F
Diodes Incorporated
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SMAJ4744A-TP
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Diodes Incorporated
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