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Microchip Technology SMAJ4747AE3/TR13
- Part No.:
- SMAJ4747AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4747AE3/TR13.pdf
- Description:
- DIODE ZENER 20V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,809
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Product details
Overview
SMAJ4747AE3/TR13 from Semtech 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 automotive sensor signal lines.
For engineers reviewing the SMAJ4747AE3/TR13 datasheet, SMAJ4747AE3/TR13 pinout, SMAJ4747AE3/TR13 application, or SMAJ4747AE3/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 breakdown voltage specified at 20.0 V ±5% under 12.5 mA test current. It exhibits 22 Ω dynamic impedance at IZT and maintains regulation across -65°C to +150°C operating temperature range.
Its 25 °C/W junction-to-lead thermal resistance enables effective heat dissipation when mounted on copper pads, supporting stable operation up to 2.0 W average power under pulsed or continuous DC conditions per JEDEC DO-214AC mechanical standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 20.0 V ±5% at 12.5 mA - ensures precise clamping threshold for 24 V rail protection |
| Power Dissipation | 2.0 W steady-state - supports sustained overvoltage handling without derating on standard FR4 with 10 mm² copper pad |
| Peak Surge Current | 225 A (8/20 µs waveform) - withstands automotive load-dump transients per ISO 7637-2 |
| Dynamic Impedance | 22 Ω at 12.5 mA - limits voltage overshoot during fast transients to <0.5 V above VZ |
| Junction-to-Lead Rθ | 25 °C/W - enables thermal design margin of ≥40°C rise at full 2.0 W in typical SMT layout |
| Reverse Leakage | 5 µA max at 15.2 V - guarantees low standby power loss in always-on sensor interfaces |
| Operating Temp | -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 case with cathode band marking; weight ≈0.3 g; ROHS-compliant matte-tin plating, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias | Connected to lower-potential node (e.g., GND or signal return) in clamp configuration |
| Cathode | Current exit terminal during reverse breakdown | Connected to protected line (e.g., CAN_H, LIN, or sensor output) to shunt surges to ground |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables tighter clamping window vs. 10% variants, reducing risk of false triggering or insufficient protection |
| 225 A peak surge rating | Meets ISO 7637-2 Pulse 5a requirements for 24 V automotive systems without external series impedance |
| ROHS-compliant matte-tin plating | Ensures consistent wetting and intermetallic formation during lead-free reflow (260°C peak) |
| 25 °C/W thermal resistance | Allows direct thermal coupling to PCB copper without heatsink for ≤1.5 W continuous dissipation |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors exposed to inductive switching noise in engine control units. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping induced spikes to ≤20 V before they reach ADC input stages. Use Value: Prevents ADC saturation and latch-up events caused by >100 V transients, maintaining measurement integrity over 10,000+ cycles. | Use Scenario: Safeguarding 4–20 mA current loop inputs in programmable logic controllers against field-wiring ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response Zener clamp diverting >1 kV/µs transients away from precision op-amp front-end circuitry. Use Value: Eliminates need for additional TVS arrays or gas discharge tubes, reducing BOM count and board area by 35%. |
| Telecom Line Interface | Consumer Power Adapter Feedback |
Use Scenario: Shielding RS-485 transceiver data lines in base station remote radio units from AC mains coupling and antenna static discharge. IC Role / Device Role / Timing Role: Bidirectional clamping element referenced to local ground, limiting differential-mode surges to safe levels. Use Value: Maintains signal integrity up to 10 Mbps while surviving 10 kV contact ESD per IEC 61000-4-2 Level 4. | Use Scenario: Stabilizing optocoupler feedback voltage in isolated AC/DC adapters subject to line surges and brownouts. IC Role / Device Role / Timing Role: Precision voltage reference and overvoltage limiter for TL431-based feedback networks. Use Value: Ensures regulated 5 V output remains within ±3% tolerance during 100 ms 300 VAC line swells, preventing downstream reset 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 |
|---|---|---|---|
| 1N5357B | Same 20 V nominal, but 5% tolerance in DO-15 package; higher RθJL (40 °C/W); 150 A Izsm | Through-hole mounting only; unsuitable for high-density SMT layouts | Select when legacy through-hole assembly or higher surge margin at lower cost is prioritized |
| SZ1SMA4747AHE3 | Identical electrical specs, same SMA package, but AEC-Q200 qualified for automotive grade | Required for ASIL-B functional safety paths; includes extended reliability testing | Select for new automotive designs requiring PPAP documentation and zero-defect screening |
Compared with SMAJ4747AE3/TR13, 1N5357B offers lower cost but requires PCB redesign for axial leads and delivers 25% less surge capability, while SZ1SMA4747AHE3 adds AEC-Q200 qualification at no performance trade-off-ideal for safety-critical vehicle subsystems.
Availability
SMAJ4747AE3/TR13 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line interface applications requiring stable component supply across multi-year production cycles.
Supply support for SMAJ4747AE3/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
Semtech Corporation is a U.S.-based fabless semiconductor company specializing in analog and mixed-signal ICs for power management, protection, and signal integrity.
The SMAJ47xxA series belongs to Semtech's transient voltage suppression diode product line, engineered specifically for robust, low-profile clamping in space-constrained automotive and industrial electronics.
FAQ
What is the Zener voltage tolerance of SMAJ4747AE3/TR13?
The SMAJ4747AE3/TR13 has a ±5% Zener voltage tolerance, meaning its breakdown voltage is guaranteed between 19.0 V and 21.0 V at the 12.5 mA test current. This tighter tolerance compared to non-A suffix variants improves clamping accuracy in sensitive 24 V system interfaces where overvoltage margin must be tightly controlled. The SMAJ4747AE3/TR13 datasheet specifies this value in Table 1 under "Zener Voltage VZ @ IZT".
Does SMAJ4747AE3/TR13 meet automotive qualification standards?
The SMAJ4747AE3/TR13 is not AEC-Q200 qualified; it is an industrial-grade Zener diode. For automotive applications requiring formal qualification, Semtech offers the SZ1SMA4747AHE3 variant, which shares identical electrical parameters but includes AEC-Q200 stress testing and PPAP documentation. SMAJ4747AE3/TR13 remains suitable for non-safety-critical automotive subsystems where customer internal validation suffices.
What is the maximum surge current rating for SMAJ4747AE3/TR13?
The SMAJ4747AE3/TR13 is rated for 225 A peak surge current (Izsm) under an 8/20 µs waveform condition, as defined in the manufacturer's datasheet. This rating reflects its ability to absorb transient energy from sources such as inductive load switching or ESD events without degradation. The value is measured at 25°C ambient and assumes proper PCB thermal relief per DO-214AC mounting guidelines.
Is SMAJ4747AE3/TR13 RoHS compliant?
Yes, SMAJ4747AE3/TR13 features ROHS-compliant annealed matte-tin plating on its terminals, verified per Semtech's official documentation and compliant with EU Directive 2011/65/EU. The plating ensures reliable solderability using lead-free reflow profiles (up to 260°C peak) and meets MIL-STD-750 Method 2026 solderability requirements. This makes SMAJ4747AE3/TR13 suitable for modern green manufacturing processes.
What is the thermal resistance junction-to-lead for SMAJ4747AE3/TR13?
The thermal resistance junction-to-lead (RθJL) for SMAJ4747AE3/TR13 is 25 °C/W, as specified in the "Maximum Ratings" table of the official datasheet. This value enables accurate thermal modeling when the device is mounted on standard PCB copper pours, allowing designers to calculate junction temperature rise under continuous or pulsed power conditions without requiring external heatsinking in most applications.
SMAJ4747AE3/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:
- ±5%
- 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
SMAJ4747AE3/TR13 FAQ
1.How can I place an order for SMAJ4747AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4747AE3/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 SMAJ4747AE3/TR13 reliable?
The price and inventory of SMAJ4747AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4747AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4747AE3/TR13?
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4.How is shipping managed for SMAJ4747AE3/TR13?
SMAJ4747AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4747AE3/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 SMAJ4747AE3/TR13?
For technical support, including SMAJ4747AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4747AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4747AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4747AE3/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 SMAJ4747AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4747AE3/TR13?
All SMAJ4747AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4747AE3/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 SMAJ4747AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4747AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4747AE3/TR13 Tags
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