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Microchip Technology SMAJ4747E3/TR13
- Part No.:
- SMAJ4747E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4747E3/TR13.pdf
- Description:
- DIODE ZENER 20V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,711
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Product details
Overview
SMAJ4747E3/TR13 from SM Semiconductor is a 20 V, 5% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 90 mA maximum regulator current at 100°C, and 225 A peak surge current; used for transient voltage suppression in I/O protection circuits of industrial sensors and automotive ECUs.
For engineers reviewing the SMAJ4747E3/TR13 datasheet, SMAJ4747E3/TR13 pinout, SMAJ4747E3/TR13 application, or SMAJ4747E3/TR13 equivalent, key selection criteria include zener voltage tolerance, surge current rating, thermal resistance, and ROHS-compliant matte-tin plating for reliable solderability in high-reliability PCB assemblies.
Technical Context
This device operates as a silicon planar Zener diode optimized for transient voltage suppression, with a sharp breakdown knee confirmed by dual-point Zener impedance measurement at IZT and IZK. Its 25 °C/W junction-to-lead thermal resistance enables stable regulation under sustained 90 mA DC current when adequately heat-sunk.
The SMAJ4747E3/TR13 exhibits 22.0 Ω dynamic impedance at 12.5 mA test current and maintains ≤5 µA reverse leakage at 15.2 V (VR), meeting IEC 61000-4-5 surge immunity requirements for signal-line protection in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 20.0 V ±5% at 12.5 mA - ensures precise clamping threshold for 24 V rail protection |
| Power Dissipation PM(AV) | 2.0 W - supports continuous operation without derating up to 100°C case temperature |
| Peak Surge Current Izsm | 225 A - withstands 8/20 µs transients per IEC 61000-4-5 Level 4 |
| Dynamic Impedance ZZT | 22.0 Ω at 12.5 mA - minimizes voltage overshoot during fast transients |
| Reverse Leakage IR | ≤5 µA at VR = 15.2 V - prevents false triggering in low-power sensor interfaces |
| Thermal Resistance RθJL | 25 °C/W - allows direct lead-mounting to copper pour for effective heat transfer |
| Operating Temperature | –65 °C to +150 °C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, void-free thermosetting epoxy body, cathode indicated by band, ROHS-compliant matte-tin plating, weight ≈0.3 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during forward bias; reference node during reverse breakdown | Connected to system ground or lower-potential rail for unidirectional clamping |
| Cathode | Current source during forward bias; high-impedance node until breakdown | Connected to protected line (e.g., CAN_H, LIN, sensor output) to clamp overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 5% zener voltage tolerance | Ensures consistent clamping level across production lots for predictable circuit margin |
| 2.0 W steady-state power rating | Supports sustained fault conditions without thermal runaway in 24 V systems |
| ROHS-compliant matte-tin plating | Guarantees repeatable solder joint formation per MIL-STD-750 Method 2026 |
| Sharp breakdown knee (IZK = 0.25 mA) | Enables low-leakage standby operation while maintaining fast response to transients |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of engine coolant temperature sensors exposed to load-dump transients in 12 V/24 V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between sensor output and ECU input. Use Value: Clamps induced spikes to ≤20 V, preventing damage to 3.3 V ADC front-ends downstream. | Use Scenario: Shielding 4–20 mA current-loop inputs on programmable logic controllers from ESD and inductive switching noise in factory automation. IC Role / Device Role / Timing Role: Zener-based shunt protector mounted directly at terminal block entry point. Use Value: Limits voltage excursion to 20 V during 1 kV/500 A surge events, preserving loop integrity. |
| Telecom Line Interface | Consumer Appliance Control Board |
Use Scenario: Safeguarding RS-485 transceiver pins against lightning-induced surges on outdoor data links. IC Role / Device Role / Timing Role: Primary-level TVS diode on differential bus lines before isolation barrier. Use Value: Absorbs 225 A peak surge energy while holding clamped voltage below transceiver absolute max rating. | Use Scenario: Suppressing commutation spikes from brushed motor drivers on washing machine main control boards. IC Role / Device Role / Timing Role: Low-profile SMA-mounted Zener across motor coil terminals. Use Value: Dissipates 2.0 W continuously during stall conditions without requiring heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4747A | Same 20 V nominal voltage but 10% tolerance; DO-41 axial package; higher RθJA (65 °C/W) | Requires through-hole mounting and larger board area; less suitable for high-density SMT layouts | Select when axial lead compatibility or legacy footprint reuse is required |
| BZX84-C20 | 20 V ±5%, SOT-23 package; 350 mW power rating; 200 mA surge rating | Limited to low-energy transients; not rated for IEC 61000-4-5 Level 4 | Choose only for space-constrained, low-risk consumer applications with <100 A surge exposure |
Compared with 1N4747A and BZX84-C20, the SMAJ4747E3/TR13 delivers superior surge robustness (225 A), tighter voltage tolerance, and lower thermal resistance-making it the preferred choice for automotive and industrial-grade transient suppression where reliability under repeated stress is critical.
Availability
SMAJ4747E3/TR13 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line interface designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMAJ4747E3/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 ISO 9001-certified production.
The SMAJ series is designed specifically for high-reliability transient voltage suppression in automotive, industrial, and telecom infrastructure, emphasizing tight voltage tolerance, high surge capability, and ROHS-compliant packaging.
FAQ
What is the zener voltage tolerance of SMAJ4747E3/TR13?
The SMAJ4747E3/TR13 has a nominal zener voltage of 20.0 V with a ±5% tolerance, verified per the manufacturer's datasheet Table 1. This tighter tolerance ensures consistent clamping performance across production units, critical for protecting sensitive 3.3 V or 5 V logic interfaces downstream of the SMAJ4747E3/TR13.
Does SMAJ4747E3/TR13 meet ROHS requirements?
Yes, SMAJ4747E3/TR13 uses ROHS-compliant annealed matte-tin plating on its terminals, fully compliant with Directive 2011/65/EU. The plating meets MIL-STD-750 Method 2026 for solderability and is specified in the mechanical data section of the official SM Semiconductor datasheet.
What is the maximum surge current rating for SMAJ4747E3/TR13?
The SMAJ4747E3/TR13 is rated for 225 A peak surge current (Izsm) using a 1/2 sine wave pulse of 1/120 second duration, per the manufacturer's Electrical Characteristics table. This rating applies at 25°C ambient and confirms suitability for IEC 61000-4-5 Level 4 surge immunity testing.
Can SMAJ4747E3/TR13 be used in automotive under-hood applications?
Yes, SMAJ4747E3/TR13 is qualified for operating temperatures from –65°C to +150°C and features a UL94V-0 epoxy case. Its 25 °C/W junction-to-lead thermal resistance and 2.0 W power rating make it suitable for under-hood ECU sensor protection, provided adequate PCB copper thermal relief is implemented.
How does the dynamic impedance of SMAJ4747E3/TR13 affect clamping performance?
The SMAJ4747E3/TR13 has a maximum dynamic impedance (ZZT) of 22.0 Ω at 12.5 mA test current. This low value limits voltage overshoot during fast transients, ensuring the clamped voltage stays within safe margins for downstream ICs-especially important in high-speed signal line protection where SMAJ4747E3/TR13 is deployed.
SMAJ4747E3/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:
- ±10%
- 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
SMAJ4747E3/TR13 FAQ
1.How can I place an order for SMAJ4747E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4747E3/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 SMAJ4747E3/TR13 reliable?
The price and inventory of SMAJ4747E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4747E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4747E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4747E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4747E3/TR13?
SMAJ4747E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4747E3/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 SMAJ4747E3/TR13?
For technical support, including SMAJ4747E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4747E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4747E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4747E3/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 SMAJ4747E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4747E3/TR13?
All SMAJ4747E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4747E3/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 SMAJ4747E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4747E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4747E3/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
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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