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Microchip Technology SMAJ4732CE3/TR13
- Part No.:
- SMAJ4732CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4732CE3/TR13.pdf
- Description:
- DIODE ZENER 4.7V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,062
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Product details
Overview
SMAJ4732CE3/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; used for overvoltage clamping on low-voltage I/O lines in industrial sensor interfaces.
For engineers reviewing the SMAJ4732CE3/TR13 datasheet, SMAJ4732CE3/TR13 pinout, SMAJ4732CE3/TR13 application, or SMAJ4732CE3/TR13 equivalent, key selection factors include zener voltage tolerance (±5%), thermal resistance (25°C/W), reverse leakage (≤10 µA at 1.0 V), surge current capability (970 mA), and ROHS-compliant matte-tin plating.
Technical Context
This device operates as a silicon planar Zener diode optimized for transient voltage suppression and precision DC voltage regulation. It maintains stable breakdown at 4.7 V ±5% with 53 mA test current, exhibits 8 Ω dynamic impedance at IZT, and supports regulated operation across -65°C to +150°C ambient range.
Its SMA (DO-214AC) thermoset epoxy package enables surface-mount compatibility while delivering 25°C/W junction-to-lead thermal resistance. The cathode band marking and void-free molding meet UL94V-0 flammability requirements for safety-critical embedded protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.7 V ±5% at 53 mA - defines precise clamping threshold for 5 V rail protection |
| Power Dissipation PM(AV) | 2.0 W - supports continuous regulation without heatsink in low-power signal paths |
| Dynamic Impedance ZZT | 8 Ω at IZT - ensures minimal voltage shift under varying load current |
| Reverse Leakage IR | ≤10 µA at VR = 1.0 V - guarantees negligible standby current in battery-powered systems |
| Surge Current Izsm | 970 mA (1/2 sine wave, 1/120 s) - withstands inductive switch-off transients in relay drivers |
| Thermal Resistance RθJL | 25 °C/W - enables accurate junction temperature estimation for reliability modeling |
| Operating Temperature | -65°C to +150°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
Two-terminal axial-lead Zener diode in SMA (DO-214AC) package; cathode identified by colored band. Package dimensions conform to JEDEC DO-214AC standard with 0.3 g mass and UL94V-0 rated epoxy body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or lower-potential rail during reverse-bias clamping operation |
| Cathode | Zener breakdown terminal / high-side clamp node | Banded end connected to protected line; conducts when voltage exceeds 4.7 V |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables tighter clamping window vs. 10% variants, reducing margin overhead in 5 V system design |
| 2.0 W steady-state rating | Supports sustained energy absorption in feedback loops and analog sensor biasing networks |
| ROHS-compliant matte-tin plating | Ensures reliable solderability per MIL-STD-750 Method 2026 without lead-based process constraints |
| UL94V-0 epoxy encapsulation | Meets flame-retardancy requirements for industrial control panel and automotive ECU mounting |
Applications
| Industrial Sensor Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Clamping induced transients on 4–5 V analog output lines of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt overvoltage spikes to ground. Use Value: Prevents damage to downstream ADC inputs with ≤10 µA leakage at 1.0 V and 4.7 V ±5% clamping accuracy. | Use Scenario: Protecting LIN bus transceiver I/O pins from load dump and inductive kickback in door module ECUs. IC Role / Device Role / Timing Role: Standoff voltage limiter placed between LIN line and transceiver VIO rail. Use Value: Absorbs 970 mA surge pulses without degradation, maintaining 4.7 V clamping threshold across -40°C to +125°C. |
| Consumer USB Peripherals | Telecom Power Sequencing |
Use Scenario: Overvoltage guard on 5 V USB VBUS detection circuitry in docking stations and hubs. IC Role / Device Role / Timing Role: Primary clamping element on microcontroller VDD_IO supply monitoring node. Use Value: Delivers 2.0 W continuous dissipation and 25°C/W thermal resistance to avoid thermal runaway during hot-plug events. | Use Scenario: Voltage reference stabilization for sequencing supervisor ICs in base station power management units. IC Role / Device Role / Timing Role: Precision 4.7 V reference source for reset threshold generation. Use Value: Maintains ±5% tolerance and 8 Ω dynamic impedance to ensure repeatable power-on reset timing across temperature. |
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 | Same 4.7 V nominal, but 10% tolerance (vs. 5%) and DO-41 package (larger footprint) | Limited to through-hole designs; higher leakage (≤50 µA at 1.0 V) reduces battery-life suitability | Select when cost sensitivity outweighs precision and space constraints |
| BZX84-C4V7 | 4.7 V ±5%, SOT-23 package, 300 mW rating (vs. 2.0 W), 80 Ω dynamic impedance | Lower power handling restricts use to signal-level clamping only, not power rail protection | Choose for ultra-compact PCB layouts where surge current < 200 mA suffices |
Compared with 1N4732A and BZX84-C4V7, SMAJ4732CE3/TR13 uniquely combines 5% tolerance, 2.0 W power rating, and DO-214AC surface-mount compatibility-making it optimal for space-constrained, high-reliability 5 V rail protection where both precision and robustness are required.
Availability
SMAJ4732CE3/TR13 is available at Aetrix Electronics and suitable for industrial sensor protection, automotive body control modules, and consumer USB peripheral designs requiring stable component supply and consistent Zener voltage performance.
Supply support for SMAJ4732CE3/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 semiconductors including Zener, TVS, rectifier, and switching diodes with global distribution and AEC-Q200 qualified products.
SMAJ4732CE3/TR13 belongs to the SMAJ47xxA series of 2.0 W Zener diodes designed specifically for high-density, low-profile overvoltage protection in industrial and automotive electronics where thermal performance and tight voltage tolerance are critical.
FAQ
What is the Zener voltage tolerance of SMAJ4732CE3/TR13?
The SMAJ4732CE3/TR13 has a Zener voltage tolerance of ±5% at 4.7 V, confirmed by its "C" suffix per the manufacturer's documentation. This tighter tolerance compared to standard 10% variants allows more precise clamping in 5 V system protection circuits. The device is tested at 53 mA (IZT) and maintains this specification across its full operating temperature range.
Does SMAJ4732CE3/TR13 meet ROHS requirements?
Yes, SMAJ4732CE3/TR13 uses ROHS-compliant annealed matte-tin plating on its terminals, verified per the official datasheet. This plating ensures solderability per MIL-STD-750 Method 2026 and eliminates lead content, making it compliant with EU Directive 2011/65/EU and suitable for environmentally regulated industrial and automotive applications.
What is the maximum surge current rating for SMAJ4732CE3/TR13?
The SMAJ4732CE3/TR13 is rated for a peak surge current (Izsm) of 970 mA under standardized 1/2 sine wave conditions (1/120 second duration). This value is measured at 25°C ambient and reflects its capability to absorb transient energy from inductive load switching, such as relay coils or solenoid drivers, without parametric shift or failure.
How does the thermal resistance of SMAJ4732CE3/TR13 affect its layout placement?
SMAJ4732CE3/TR13 has a junction-to-lead thermal resistance (RθJL) of 25°C/W, meaning each watt dissipated raises the junction temperature 25°C above the lead temperature. For reliable operation, PCB copper area must be sufficient to maintain lead temperature below 100°C under worst-case 2.0 W dissipation-typically requiring ≥25 mm² of 1 oz copper connected to both terminals.
Is SMAJ4732CE3/TR13 suitable for automotive under-hood applications?
Yes, SMAJ4732CE3/TR13 is rated for operating temperatures from -65°C to +150°C and features UL94V-0 epoxy encapsulation, making it suitable for under-hood automotive applications such as body control modules and sensor interfaces. Its 4.7 V ±5% clamping and 970 mA surge rating align with ISO 7637-2 pulse 1/2a/3a immunity requirements when properly mounted.
SMAJ4732CE3/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:
- ±2%
- 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
SMAJ4732CE3/TR13 FAQ
1.How can I place an order for SMAJ4732CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4732CE3/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 SMAJ4732CE3/TR13 reliable?
The price and inventory of SMAJ4732CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4732CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4732CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4732CE3/TR13 transactions.
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4.How is shipping managed for SMAJ4732CE3/TR13?
SMAJ4732CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4732CE3/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 SMAJ4732CE3/TR13?
For technical support, including SMAJ4732CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4732CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4732CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4732CE3/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 SMAJ4732CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4732CE3/TR13?
All SMAJ4732CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4732CE3/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 SMAJ4732CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4732CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4732CE3/TR13 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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