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Microchip Technology SMAJ4732AE3/TR13
- Part No.:
- SMAJ4732AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4732AE3/TR13.pdf
- Description:
- DIODE ZENER 4.7V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,376
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Product details
Overview
SMAJ4732AE3/TR13 from SM Semiconductors 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. It serves as a precision voltage reference and transient overvoltage clamp in low-profile power rail protection circuits.
For engineers reviewing the SMAJ4732AE3/TR13 datasheet, SMAJ4732AE3/TR13 pinout, SMAJ4732AE3/TR13 application, or SMAJ4732AE3/TR13 equivalent, key selection criteria include nominal Zener voltage (4.7 V), tolerance (±5%), thermal resistance (25 °C/W), surge capability (970 mA), and DO-214AC mechanical compatibility with high-density PCB layouts.
Technical Context
This device operates as a silicon planar Zener diode optimized for voltage regulation and transient suppression in DC power rails. Its 4.7 V breakdown voltage is specified at 53 mA test current (IZT), with dynamic impedance of 8.0 Ω and knee impedance of 500 Ω at 1.0 mA (IZK).
It exhibits low reverse leakage (≤10 µA at 1.0 V VR), stable operation across -65°C to +150°C, and meets UL94V-0 flammability rating via void-free thermosetting epoxy encapsulation. Cathode polarity is marked by a band on the SMA package body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.7 V ±5% at 53 mA - defines clamping threshold for overvoltage protection |
| Power Dissipation PM(AV) | 2.0 W - sets continuous thermal limit without heatsink |
| Max Surge Current Izsm | 970 mA - supports single-pulse transients per 1/2-sine wave standard |
| Dynamic Impedance ZZT | 8.0 Ω at IZT - ensures tight regulation under varying load current |
| Thermal Resistance RθJL | 25 °C/W - enables predictable junction temperature rise from lead-to-junction path |
| Reverse Leakage IR | ≤10 µA at 1.0 V VR - guarantees minimal standby power loss in bias networks |
| Operating Temperature | -65°C to +150°C - validated for automotive under-hood and industrial ambient extremes |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode-banded axial-lead configuration; void-free UL94V-0 epoxy body; matte-tin ROHS-compliant plating; 0.3 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lower potential rail during Zener operation |
| Cathode | Reverse-biased Zener terminal / clamping output node | Connected to protected line; conducts when voltage exceeds 4.7 V to shunt surge energy |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables tighter regulation margin vs. 10% variants, reducing design safety headroom |
| 2.0 W steady-state power rating | Supports sustained clamping in 5 V rail applications without derating below 100°C |
| DO-214AC package footprint | Offers 30% smaller board area than DO-41 while maintaining axial-lead solderability |
| UL94V-0 epoxy encapsulation | Meets flame-retardancy requirements for industrial and automotive end equipment |
| Cathode band polarity marking | Prevents misorientation during automated placement and manual inspection |
Applications
| 5 V Power Rail Protection | Microcontroller I/O Clamp |
|---|---|
Use Scenario: Protecting 5 V supply lines in embedded controllers against inductive switching spikes from relays or solenoids. IC Role / Device Role / Timing Role: Zener clamping diode placed between rail and ground to limit transient excursions to ≤4.7 V. Use Value: Prevents latch-up or damage to downstream 5 V logic ICs by diverting >970 mA surge pulses within 10 ns response time. | Use Scenario: Safeguarding GPIO pins of ARM Cortex-M microcontrollers exposed to external sensor wiring. IC Role / Device Role / Timing Role: Low-capacitance shunt element limiting input voltage to 4.7 V during ESD or cable discharge events. Use Value: Maintains signal integrity while meeting IEC 61000-4-2 Level 4 (8 kV contact) immunity without adding series resistance. |
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
Use Scenario: Clamping LIN bus transceiver supply inputs in vehicle door modules subject to load dump transients. IC Role / Device Role / Timing Role: Primary overvoltage suppressor on 5 V LDO output feeding LIN PHY ICs. Use Value: Withstands 970 mA surges per ISO 7637-2 Pulse 1/2b, enabling compliance without additional TVS stages. | Use Scenario: Stabilizing reference voltage for 4–20 mA transmitter front-end op-amps in factory automation sensors. IC Role / Device Role / Timing Role: Precision 4.7 V shunt reference providing stable bias for current-loop scaling resistors. Use Value: Delivers <±1% drift over -40°C to +125°C due to low tempco Zener structure and 25 °C/W thermal path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4732A | DO-41 package; higher RθJA (65 °C/W); same 4.7 V ±5%, 1.0 W rating | Requires larger PCB area and heatsinking for equivalent 2.0 W operation | Select when legacy through-hole assembly or higher thermal mass is preferred |
| BZX55-C4V7 | DO-35 package; 500 mW rating; 4.7 V ±5%; 500 Ω ZZT | Limited to low-energy clamping; unsuitable for >500 mA surge scenarios | Select only for space-constrained signal-level biasing, not power rail protection |
Compared with 1N4732A and BZX55-C4V7, SMAJ4732AE3/TR13 delivers 2× power handling in 40% less board area, enabling compact, high-reliability 5 V rail protection where thermal performance and surge robustness are critical.
Availability
SMAJ4732AE3/TR13 is available at Aetrix Electronics and suitable for 5 V power rail protection, microcontroller I/O clamping, and automotive body control module designs requiring stable component supply and full RoHS compliance.
Supply support for SMAJ4732AE3/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 Semiconductors 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 surface-mount transient voltage suppression and precision DC voltage regulation in space-constrained, high-reliability power systems.
FAQ
What is the Zener voltage tolerance of SMAJ4732AE3/TR13?
The SMAJ4732AE3/TR13 has a nominal Zener voltage of 4.7 V with a ±5% tolerance, as indicated by the "A" suffix in the part number per the manufacturer's documentation. This tolerance applies at the specified test current of 53 mA and ensures predictable clamping behavior across production lots without requiring binning or post-assembly calibration.
Does SMAJ4732AE3/TR13 meet RoHS requirements?
Yes, SMAJ4732AE3/TR13 complies with RoHS Directive 2011/65/EU. Its terminals feature ROHS-compliant annealed matte-tin plating, and the void-free thermosetting epoxy body meets UL94V-0 flammability standards. The "E3" suffix explicitly denotes RoHS-compliant construction per SM Semiconductors' part numbering system.
What is the maximum surge current rating for SMAJ4732AE3/TR13?
The SMAJ4732AE3/TR13 is rated for a peak surge current (Izsm) of 970 mA, measured using a 1/2 sine-wave pulse of 1/120 second duration at 25°C ambient. This value is derived from the device's 2.0 W power rating and thermal design, enabling reliable suppression of common automotive and industrial transient waveforms such as ISO 7637-2 Pulse 1.
How does the SMA (DO-214AC) package of SMAJ4732AE3/TR13 compare to DO-41?
The SMA (DO-214AC) package of SMAJ4732AE3/TR13 offers a 30% smaller footprint and lower profile than DO-41, while maintaining axial-lead solderability. Its 25 °C/W junction-to-lead thermal resistance improves heat transfer over DO-41's typical 65 °C/W junction-to-ambient, making SMAJ4732AE3/TR13 better suited for high-density SMT layouts with limited airflow.
Can SMAJ4732AE3/TR13 be used as a voltage reference in precision analog circuits?
SMAJ4732AE3/TR13 can serve as a cost-effective voltage reference in non-critical analog circuits, delivering 4.7 V ±5% at 53 mA with 8.0 Ω dynamic impedance. However, it lacks temperature compensation and exhibits higher tempco than dedicated reference ICs; for precision applications requiring <0.1% stability, a bandgap reference IC is recommended instead of SMAJ4732AE3/TR13.
SMAJ4732AE3/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:
- ±5%
- 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
SMAJ4732AE3/TR13 FAQ
1.How can I place an order for SMAJ4732AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4732AE3/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 SMAJ4732AE3/TR13 reliable?
The price and inventory of SMAJ4732AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4732AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4732AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4732AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4732AE3/TR13?
SMAJ4732AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4732AE3/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 SMAJ4732AE3/TR13?
For technical support, including SMAJ4732AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4732AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4732AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4732AE3/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 SMAJ4732AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4732AE3/TR13?
All SMAJ4732AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4732AE3/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 SMAJ4732AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4732AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4732AE3/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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Diodes Incorporated
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SMAJ4744A-TP
Micro Commercial Co
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Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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