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Microchip Technology SMAJ4747CE3/TR13
- Part No.:
- SMAJ4747CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4747CE3/TR13.pdf
- Description:
- DIODE ZENER 20V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,628
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Product details
Overview
SMAJ4747CE3/TR13 from SM Semiconductor is a 20 V, ±2% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 90 mA maximum regulator current (IZM), and 225 A peak surge current (Izsm), used for transient voltage suppression in power rail and signal line protection.
For engineers reviewing the SMAJ4747CE3/TR13 datasheet, SMAJ4747CE3/TR13 pinout, SMAJ4747CE3/TR13 application, or SMAJ4747CE3/TR13 equivalent, key selection criteria include zener voltage tolerance (±2%), thermal resistance (25 °C/W), reverse leakage (≤5 µA at 15.2 V), surge capability, and ROHS-compliant matte-tin plating for reliable solderability.
Technical Context
This device operates as a silicon planar Zener diode optimized for transient voltage suppression, with sharp breakdown knee (IZK = 0.25 mA) and low dynamic impedance (ZZT = 22 Ω at IZT = 12.5 mA). It maintains regulation across -65 °C to +150 °C operating temperature range.
Designed for unidirectional clamping, it features cathode band polarity marking, void-free thermosetting epoxy case (UL94V-0), and flexible axial-lead mounting-enabling direct integration into high-density PCB layouts without heatsinking for moderate surge duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.0 V ±2% at 12.5 mA test current - ensures precise clamping threshold for 24 V rail protection |
| Power Dissipation | 2.0 W steady-state - supports continuous regulation under sustained overvoltage conditions |
| Peak Surge Current | 225 A (1/2 sine wave, 1/120 s) - handles lightning-induced transients per IEC 61000-4-5 Level 4 |
| Reverse Leakage | ≤5 µA at VR = 15.2 V - minimizes standby power loss in always-on protection circuits |
| Thermal Resistance | 25 °C/W junction-to-lead - enables direct lead heat sinking for extended pulse handling |
| Operating Temp | -65 °C to +150 °C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode indicated by band, 0.3 g weight, UL94V-0 epoxy body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during forward bias; reference node during reverse breakdown | Connected to lower-potential side of protected circuit (e.g., GND or return path) |
| Cathode | Clamping node during transient events; voltage reference during regulation | Connected to protected line (e.g., 24 V supply or signal trace) to clamp excursions above 20 V |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tighter clamping window vs. ±5% or ±10% variants, reducing margin needed in 24 V system design |
| 22 Ω dynamic impedance at 12.5 mA | Ensures stable regulation under varying load currents, minimizing output voltage drift during fault conditions |
| ROHS-compliant matte-tin plating | Guarantees solderability per MIL-STD-750 Method 2026, supporting lead-free reflow and mixed-technology assembly |
| UL94V-0 epoxy encapsulation | Provides flame-retardant mechanical integrity for safety-critical automotive and industrial applications |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamping |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs from load dump transients up to ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between power rail and chassis ground. Use Value: Clamps spikes to ≤20 V with 225 A surge capacity, preventing damage to downstream DC-DC converters and microcontrollers. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in PLC I/O modules against ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance Zener clamp on differential or single-ended signal lines. Use Value: Limits excursion to 20 V while maintaining <5 µA leakage, preserving signal integrity and ADC accuracy. |
| Telecom Power Interface Protection | Consumer Device USB Port Overvoltage Guard |
Use Scenario: Front-end protection for PoE-powered network switches exposed to induced surges on 48 V DC input. IC Role / Device Role / Timing Role: Primary clamping device on DC input before primary filter and DC-DC stage. Use Value: Absorbs 225 A surge energy without degradation, meeting GR-1089-CORE Level 3 requirements. | Use Scenario: Secondary overvoltage guard on VBUS line of USB-C ports in smart home hubs. IC Role / Device Role / Timing Role: Standby Zener clamp activated only during overvoltage faults (e.g., charger malfunction). Use Value: Maintains <5 µA leakage at 15.2 V, avoiding false triggering while enabling fast response to >20 V events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5357BRLG | 20 V ±5%, 5 W rating, DO-201AD package, higher thermal mass but larger footprint | Preferred where higher average power handling is required and board space permits axial-leaded solution | Select when surge repetition rate exceeds SMAJ4747CE3/TR13's 2.0 W steady-state limit |
| BZX84-C20LT1G | 20 V ±5%, 300 mW, SOT-23 package, 10× smaller size but 1/7th surge rating (30 A) | Suitable for low-energy ESD-only protection in space-constrained portable electronics | Choose only for non-lightning-grade protection; not interchangeable for IEC 61000-4-5 compliance |
Compared with 1N5357BRLG and BZX84-C20LT1G, SMAJ4747CE3/TR13 delivers optimal balance of precision (±2%), compactness (SMA), and robust surge immunity (225 A), making it the preferred choice for automotive and industrial 24 V systems requiring repeatable clamping performance without layout redesign.
Availability
SMAJ4747CE3/TR13 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface clamping, and telecom DC input surge suppression requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ4747CE3/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, with emphasis on industrial and automotive reliability.
The SMAJ47xxA series is designed specifically for high-reliability transient voltage suppression in harsh-environment power and signal interfaces, targeting applications demanding tight voltage tolerance, high surge resilience, and UL-certified packaging.
FAQ
What is the Zener voltage tolerance of SMAJ4747CE3/TR13?
The SMAJ4747CE3/TR13 has a Zener voltage tolerance of ±2%, confirmed by the "C" suffix in its part number per the manufacturer's documentation. This means its breakdown voltage is guaranteed between 19.6 V and 20.4 V at 12.5 mA test current, enabling tighter design margins than ±5% or ±10% variants. The SMAJ4747CE3/TR13 achieves this precision through tighter process control during wafer fabrication and binning.
Does SMAJ4747CE3/TR13 meet ROHS requirements?
Yes, SMAJ4747CE3/TR13 uses ROHS-compliant annealed matte-tin plating on its terminals, verified per MIL-STD-750 Method 2026 for solderability. Its void-free thermosetting epoxy case also complies with UL94V-0 flammability standards. No lead or hazardous substances exceed EU Directive 2011/65/EU limits, and full material declarations are available upon request for the SMAJ4747CE3/TR13.
What is the maximum surge current rating for SMAJ4747CE3/TR13?
The SMAJ4747CE3/TR13 is rated for 225 A peak surge current under standardized 1/2 sine wave conditions (1/120 second duration), as specified in Table 1 of the official datasheet. This rating applies at 25 °C ambient and assumes proper PCB copper pour for thermal conduction. Derating is required above 70 °C ambient, and the SMAJ4747CE3/TR13 must be mounted with adequate thermal relief to sustain repeated surges.
How does the thermal resistance of SMAJ4747CE3/TR13 affect its power handling?
SMAJ4747CE3/TR13 has a junction-to-lead thermal resistance of 25 °C/W, meaning each watt of dissipated power raises the junction temperature by 25 °C above lead temperature. For reliable 2.0 W steady-state operation, the lead must be held at ≤100 °C to keep TJ ≤150 °C. This requires direct connection to ≥1 cm² of 2 oz copper or use of thermal vias-critical for sustaining the SMAJ4747CE3/TR13 in continuous overvoltage scenarios.
Can SMAJ4747CE3/TR13 be used in bidirectional transient suppression?
No, SMAJ4747CE3/TR13 is a unidirectional Zener diode intended for single-polarity clamping (cathode to protected line, anode to ground). It lacks symmetrical breakdown characteristics and cannot suppress negative-going transients. For bidirectional protection, two SMAJ4747CE3/TR13 devices must be connected in series opposition, or a dedicated bidirectional TVS like SMAJ20CA should be selected instead of the SMAJ4747CE3/TR13.
SMAJ4747CE3/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):
- 20 V
- Tolerance:
- ±2%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 22 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 15.2 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
SMAJ4747CE3/TR13 FAQ
1.How can I place an order for SMAJ4747CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4747CE3/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 SMAJ4747CE3/TR13 reliable?
The price and inventory of SMAJ4747CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4747CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4747CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4747CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4747CE3/TR13?
SMAJ4747CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4747CE3/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 SMAJ4747CE3/TR13?
For technical support, including SMAJ4747CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4747CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4747CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4747CE3/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 SMAJ4747CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4747CE3/TR13?
All SMAJ4747CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4747CE3/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 SMAJ4747CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4747CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4747CE3/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
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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