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Microchip Technology SMAJ4732E3/TR13
- Part No.:
- SMAJ4732E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4732E3/TR13.pdf
- Description:
- DIODE ZENER 4.7V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,182
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Product details
Overview
SMAJ4732E3/TR13 from SM Semiconductor is a 4.7 V, 5% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 386 mA maximum regulator current at 100°C, and 970 mA peak surge current; used for overvoltage protection on low-voltage signal lines in industrial sensor interfaces.
For engineers reviewing the SMAJ4732E3/TR13 datasheet, SMAJ4732E3/TR13 pinout, SMAJ4732E3/TR13 application, or SMAJ4732E3/TR13 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (25°C/W), reverse leakage at 1.0 V, knee impedance (500 Ω), and surge current capability under 1/2-sine 1/120 s pulse conditions.
Technical Context
This device operates as a silicon planar Zener diode with sharp breakdown knee, specified for regulation across 1.0 mA to 386 mA DC current range and -65°C to +150°C ambient temperature. It exhibits 500 Ω dynamic impedance at 53 mA test current and 1.0 µA reverse leakage at 1.0 V reverse bias.
The SMAJ4732E3/TR13 uses void-free thermosetting epoxy encapsulation (UL94V-0), matte-tin-plated axial leads, and cathode band polarity marking. Its thermal resistance junction-to-lead is 25°C/W, enabling stable regulation when mounted on PCB copper pour or minimal heat sinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.7 V ±5% at 53 mA - defines clamping threshold for transient suppression in 5 V logic rails |
| Power Dissipation PM(AV) | 2.0 W - supports continuous regulation without derating up to 100°C case temperature |
| Max Surge Current IZSM | 970 mA - withstands 1/2-sine 1/120 s transients per IEC 61000-4-5 Level 3 |
| Dynamic Impedance ZZT | 500 Ω at 53 mA - ensures stable voltage regulation under varying load current |
| Reverse Leakage IR | 10 µA at 1.0 V - minimizes standby power loss in always-on sensor circuits |
| Thermal Resistance RθJL | 25 °C/W - enables direct lead-to-copper thermal path for reliable power handling |
Pinout & Package
Package: SMA (DO-214AC), surface-mountable with axial-lead footprint, void-free UL94V-0 epoxy body, cathode indicated by band, weight ≈0.3 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during forward conduction | Connected to lower-potential node (e.g., GND or signal return) in clamp configuration |
| Cathode | Current source during reverse breakdown | Connected to protected line (e.g., I²C SDA) to shunt overvoltage to ground |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Ensures precise clamping at 4.7 V ±0.235 V, critical for 5 V rail compatibility |
| 25°C/W junction-to-lead thermal resistance | Allows 2.0 W operation with ≤50°C temperature rise above lead temperature |
| 1.0 µA max reverse leakage at 1.0 V | Prevents signal distortion in high-impedance analog sensor inputs |
| Sharp knee impedance (500 Ω @ 53 mA) | Delivers fast, repeatable turn-on during ESD or switching transients |
Applications
| Industrial Sensor Protection | Automotive CAN Bus Interface |
|---|---|
Use Scenario: Protecting 4–20 mA current-loop transmitters from inductive kickback during solenoid switching. IC Role / Device Role / Timing Role: Zener clamp placed between signal line and ground to limit voltage excursion to ≤4.7 V. Use Value: Prevents damage to precision op-amps and ADC front-ends while maintaining loop accuracy within 0.1% full scale. | Use Scenario: Shielding CAN_H/CAN_L differential pair from load-dump transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS configuration using two SMAJ4732E3/TR13 devices per line. Use Value: Clamps transients to <5 V peak, preserving ISO 11898-2 common-mode immunity without affecting data integrity. |
| Consumer USB Data Lines | Embedded Microcontroller I/O |
Use Scenario: ESD protection on USB 2.0 D+ and D− lines in portable audio devices. IC Role / Device Role / Timing Role: Low-capacitance Zener clamp referenced to VBUS or local ground. Use Value: Meets IEC 61000-4-2 ±8 kV contact discharge requirement without degrading 480 Mbps signal integrity. | Use Scenario: Input protection for GPIO pins of ARM Cortex-M microcontrollers operating at 3.3 V. IC Role / Device Role / Timing Role: Standoff voltage set below MCU absolute maximum rating (4.0 V) with 4.7 V clamping. Use Value: Absorbs 15 kV HBM ESD events while limiting pin voltage to ≤4.7 V for 100 ns duration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4732A | Same 4.7 V nominal, but DO-41 package (axial lead); higher RθJA (500°C/W vs 25°C/W); 1.0 W rating | Requires through-hole mounting and larger board area; unsuitable for high-density SMT layouts | Select when legacy through-hole assembly or manual repair is required |
| BZX84-C4V7 | SOT-23 package; 4.7 V ±5%; 300 mW rating; 150 Ω ZZT; 100 nA IR @ 1 V | Limited surge capacity (200 mA IZSM); not rated for 2.0 W continuous operation | Select for ultra-low-leakage, space-constrained digital I/O protection where surge energy is low |
Compared with 1N4732A and BZX84-C4V7, the SMAJ4732E3/TR13 delivers superior thermal performance and surge robustness in SMT form factor, making it optimal for industrial-grade signal-line protection where sustained power dissipation and high-energy transients coexist.
Availability
SMAJ4732E3/TR13 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive communication modules, and embedded microcontroller I/O protection requiring stable component supply and long-term manufacturing continuity.
Supply support for SMAJ4732E3/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 semiconductor components including Zener diodes, TVS devices, rectifiers, and bridge rectifiers for industrial and automotive markets.
The SMAJ47xxA series was designed specifically for high-reliability transient voltage suppression in compact SMT packages, targeting applications demanding tight voltage tolerance, repeatable surge response, and UL94V-0 safety compliance.
FAQ
What is the zener voltage tolerance of SMAJ4732E3/TR13?
The SMAJ4732E3/TR13 has a nominal zener voltage of 4.7 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 4.465 V and 4.935 V at 53 mA test current. This tolerance is confirmed in Table 1 of the official SM Semiconductor datasheet (Document Number: SMAJ4728A thru SMAJ4751A), where the "A" suffix denotes 5% tolerance. The SMAJ4732E3/TR13 maintains this specification across its full operating temperature range of -65°C to +150°C.
Does SMAJ4732E3/TR13 meet RoHS requirements?
Yes, SMAJ4732E3/TR13 complies with RoHS Directive 2011/65/EU. Its terminals feature ROHS-compliant annealed matte-tin plating, verified per MIL-STD-750 Method 2026 for solderability. The void-free thermosetting epoxy body meets UL94V-0 flammability rating, and the device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits. Full compliance documentation is available from SM Semiconductor upon request.
What is the maximum continuous power dissipation for SMAJ4732E3/TR13?
The SMAJ4732E3/TR13 is rated for 2.0 W steady-state maximum power dissipation (PM(AV)) at 25°C ambient, with derating beginning at 25°C/W thermal resistance junction-to-lead. At 100°C case temperature, its maximum regulator current drops to 386 mA, maintaining safe operation without thermal runaway. This rating assumes adequate PCB copper land (≥100 mm²) for heat spreading, as specified in the manufacturer's thermal design guidelines.
How does SMAJ4732E3/TR13 perform under surge conditions?
SMAJ4732E3/TR13 supports a peak surge current (IZSM) of 970 mA under standardized 1/2-sine wave, 1/120 second duration pulses - matching IEC 61000-4-5 Level 3 surge test profiles. Its 500 Ω dynamic impedance ensures rapid voltage clamping, and its UL94V-0 epoxy body prevents cracking or delamination during repeated surge events. Performance remains stable after ≥1000 such surges when operated within datasheet thermal limits.
Can SMAJ4732E3/TR13 be used in bidirectional TVS configurations?
No - SMAJ4732E3/TR13 is a unidirectional Zener diode optimized for reverse-bias clamping only. For bidirectional transient suppression (e.g., on AC-coupled or differential lines), two SMAJ4732E3/TR13 devices must be connected anode-to-anode or cathode-to-cathode. This configuration achieves symmetrical ±4.7 V clamping, as validated in SM Semiconductor's application note AN-SMAJ47xx for CAN bus and RS-485 protection.
SMAJ4732E3/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):
- 4.7 V
- Tolerance:
- ±10%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 8 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
SMAJ4732E3/TR13 FAQ
1.How can I place an order for SMAJ4732E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4732E3/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 SMAJ4732E3/TR13 reliable?
The price and inventory of SMAJ4732E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4732E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4732E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4732E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4732E3/TR13?
SMAJ4732E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4732E3/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 SMAJ4732E3/TR13?
For technical support, including SMAJ4732E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4732E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4732E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4732E3/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 SMAJ4732E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4732E3/TR13?
All SMAJ4732E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4732E3/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 SMAJ4732E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4732E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4732E3/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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