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Microchip Technology SMAJ4743AE3/TR13
- Part No.:
- SMAJ4743AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4743AE3/TR13.pdf
- Description:
- DIODE ZENER 13V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,237
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Product details
Overview
SMAJ4743AE3/TR13 from SM Semiconductor is a 13.0 V, 5% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 138 mA maximum regulator current at 100°C, and 344 A peak surge current; used for transient voltage suppression in I/O protection circuits of industrial sensors and automotive ECUs.
For engineers reviewing the SMAJ4743AE3/TR13 datasheet, SMAJ4743AE3/TR13 pinout, SMAJ4743AE3/TR13 application, or SMAJ4743AE3/TR13 equivalent, key selection criteria include breakdown voltage tolerance, surge current capability, thermal resistance, and ROHS-compliant matte-tin plating for reliable solderability in high-reliability PCB assemblies.
Technical Context
This device operates as a silicon Zener diode with sharp knee regulation, specified at 19.0 mA test current (IZT) and 0.25 mA knee current (IZK). Its 10 Ω dynamic impedance (ZZT) at IZT ensures stable voltage clamping under fast transients.
Designed for unidirectional transient suppression, it features cathode band polarity marking, void-free UL94V-0 epoxy encapsulation, and thermal resistance of 25 °C/W junction-to-lead-enabling effective heat dissipation in compact surface-mount layouts without external heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 13.0 V ±5% at 19.0 mA - defines precise clamping threshold for overvoltage events |
| Power Dissipation PM(AV) | 2.0 W - supports continuous operation in low-duty-cycle surge environments |
| Peak Surge Current Izsm | 344 A - withstands 1/2-sine 120 Hz pulses per MIL-STD-750 Method 3012 |
| Dynamic Impedance ZZT | 10 Ω at IZT - minimizes voltage deviation during transient conduction |
| Thermal Resistance RθJL | 25 °C/W - enables direct lead-to-PCB thermal path for self-cooling |
| Reverse Leakage IR | 5 µA at 9.9 V - ensures low standby power loss in always-on protection circuits |
| Operating Temperature | –65 to +150 °C - qualified for under-hood automotive and industrial ambient conditions |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, axial-lead compatible outline with cathode band marking; body marked with part number; weight ≈0.3 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias or transient clamp | Connected to protected line or ground return path depending on circuit topology |
| Cathode | Current exit terminal during reverse breakdown | Marked by colored band; tied to higher-potential rail for unidirectional clamping |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Ensures tight clamping window across production lots without binning |
| ROHS-compliant matte-tin plating | Guarantees repeatable solder joint formation per MIL-STD-750 Method 2026 |
| UL94V-0 void-free epoxy case | Provides flame-retardant mechanical integrity in high-density PCB assemblies |
| Low knee impedance (700 Ω at 0.25 mA) | Enables effective regulation even at microamp-level leakage currents |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Suppressing load-dump spikes on CAN bus sensor lines in engine control modules. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor clamping induced surges above 13 V. Use Value: Prevents damage to 3.3 V/5 V signal receivers while maintaining <5 µA leakage at 9.9 V operating bias. | Use Scenario: Protecting analog input channels of programmable logic controllers against ESD and relay-switching transients. IC Role / Device Role / Timing Role: Zener-based shunt clamp placed between signal line and ground. Use Value: Delivers 344 A surge handling within DO-214AC footprint, eliminating need for larger TVS arrays. |
| Consumer Power Adapter Output | Telecom Line Interface Protection |
Use Scenario: Secondary-side overvoltage safeguard in AC/DC adapters for USB-C PD devices. IC Role / Device Role / Timing Role: Standby-mode Zener regulator absorbing output capacitor discharge energy. Use Value: Maintains 13.0 V clamping with 25 °C/W thermal resistance, enabling direct PCB copper pour cooling. | Use Scenario: Front-end protection for RS-485 transceivers in base station backhaul links. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp on differential pair lines. Use Value: Provides 138 mA steady-state current rating at 100°C, supporting extended outdoor temperature operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4743A | Same 13 V nominal Zener voltage but in DO-41 package; 1.0 W rating; 200 mA max IZM | Through-hole mounting only; lower surge current (1200 A vs. 344 A) due to different pulse definition | Preferred for legacy through-hole designs where board rework is prohibitive |
| BZX55C13 | 13 V ±5%, 500 mW rating, DO-35 package; 100 mA max IZM; 500 Ω ZZT | Lower power handling limits use to low-energy signal lines only | Selected when space-constrained PCBs require sub-3 mm axial footprint |
Compared with 1N4743A and BZX55C13, SMAJ4743AE3/TR13 delivers higher surge robustness in surface-mount form factor, making it optimal for modern automotive and industrial PCBs requiring both miniaturization and high-energy transient immunity.
Availability
SMAJ4743AE3/TR13 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O conditioning, and telecom line interface circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMAJ4743AE3/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 Semiconductor is a Taiwan-based manufacturer specializing in discrete semiconductors, including Zener diodes, TVS devices, rectifiers, and bridge rectifiers for industrial and automotive markets.
The SMAJ47xxA series was designed specifically for high-reliability transient suppression in space-constrained, thermally demanding applications-emphasizing consistent Zener voltage tolerance, surge survivability, and ROHS-compliant manufacturability.
FAQ
What is the Zener voltage tolerance of SMAJ4743AE3/TR13?
The SMAJ4743AE3/TR13 has a ±5% Zener voltage tolerance, meaning its breakdown voltage is guaranteed between 12.35 V and 13.65 V at 19.0 mA test current. This tighter tolerance compared to standard 10% variants ensures predictable clamping behavior in precision protection circuits. The 'A' suffix in the part number explicitly denotes this 5% specification, as confirmed in the official SM Semiconductor datasheet revision Feb.29,2012.
Does SMAJ4743AE3/TR13 meet ROHS requirements?
Yes, SMAJ4743AE3/TR13 uses ROHS-compliant annealed matte-tin plating on its terminals, verified per MIL-STD-750 Method 2026 for solderability. The device's void-free thermosetting epoxy case also complies with UL94V-0 flammability standards. These material specifications are documented in the mechanical data section of the official SMAJ4728A–SMAJ4751A datasheet.
What is the maximum surge current rating for SMAJ4743AE3/TR13?
The SMAJ4743AE3/TR13 is rated for 344 A peak surge current (Izsm), measured using a 1/2 sine wave pulse of 1/120 second duration at 25°C ambient. This value corresponds to the 13.0 V breakdown variant in Table 1 of the SM Semiconductor datasheet and reflects its capability to absorb high-energy transients common in automotive and industrial switching environments.
How does the thermal resistance of SMAJ4743AE3/TR13 affect PCB layout?
SMAJ4743AE3/TR13 has a junction-to-lead thermal resistance of 25 °C/W, enabling efficient heat transfer directly from the die to PCB copper via its leads. For optimal thermal performance, designers should use minimum 1.5 mm² copper pour connected to both anode and cathode pads-no additional heatsink required. This characteristic simplifies layout in dense automotive and industrial modules where airflow is limited.
Can SMAJ4743AE3/TR13 be used in bidirectional transient protection?
No, SMAJ4743AE3/TR13 is a unidirectional Zener diode intended for single-polarity clamping-cathode must be biased at higher potential than anode. For bidirectional protection, two SMAJ4743AE3/TR13 devices in series opposition or a dedicated bidirectional TVS like SMAJ13A would be required. The device's polarity marking (cathode band) and electrical characteristics table confirm its unidirectional functionality.
SMAJ4743AE3/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):
- 13 V
- Tolerance:
- ±5%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 9.9 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
SMAJ4743AE3/TR13 FAQ
1.How can I place an order for SMAJ4743AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4743AE3/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 SMAJ4743AE3/TR13 reliable?
The price and inventory of SMAJ4743AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4743AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4743AE3/TR13?
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4.How is shipping managed for SMAJ4743AE3/TR13?
SMAJ4743AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4743AE3/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 SMAJ4743AE3/TR13?
For technical support, including SMAJ4743AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4743AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4743AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4743AE3/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 SMAJ4743AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4743AE3/TR13?
All SMAJ4743AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4743AE3/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 SMAJ4743AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4743AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4743AE3/TR13 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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SMAZ12-13-F
Diodes Incorporated
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