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Microchip Technology SMAJ4733CE3/TR13
- Part No.:
- SMAJ4733CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4733CE3/TR13.pdf
- Description:
- DIODE ZENER 5.1V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,727
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Product details
Overview
SMAJ4733CE3/TR13 from SM Semiconductor is a 5.1 V, ±2% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 356 mA maximum regulator current at 100°C, and 890 mA peak surge current, used for precision voltage regulation and transient overvoltage protection in low-profile power rails.
For engineers reviewing the SMAJ4733CE3/TR13 datasheet, SMAJ4733CE3/TR13 pinout, SMAJ4733CE3/TR13 application, or SMAJ4733CE3/TR13 equivalent, key selection criteria include zener voltage tolerance (±2%), thermal resistance (25°C/W), reverse leakage (≤10 µA @ 1.0 V), knee impedance (7.0 Ω @ 1.0 mA), and surge capability under 1/2-sine 120 Hz waveform.
Technical Context
This device operates as a silicon planar Zener diode with sharp breakdown knee and stable regulation across -65°C to +150°C ambient range. It delivers precise 5.1 V reference under 49 mA test current (IZT), with dynamic impedance of 7.0 Ω and knee impedance of 7.0 Ω at 1.0 mA (IZK).
Designed for unidirectional transient voltage suppression and DC voltage regulation, it features void-free thermosetting epoxy case (UL94V-0), matte-tin plating compliant with MIL-STD-750 Method 2026, and cathode band polarity marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 5.1 V ±2% at 49 mA - ensures tight regulation for 5 V logic supply clamping and reference stability |
| Power Dissipation | 2.0 W steady-state - supports continuous regulation in compact PCB layouts without forced cooling |
| Surge Current | 890 mA peak (1/2-sine, 120 Hz) - withstands inductive switching transients in automotive and industrial controls |
| Reverse Leakage | ≤10 µA @ 1.0 V - minimizes standby power loss in battery-backed sensor circuits |
| Thermal Resistance | 25 °C/W junction-to-lead - enables reliable operation up to 100°C case temperature with standard lead soldering |
| Knee Impedance | 7.0 Ω @ 1.0 mA - provides low-voltage-drop regulation onset for low-current bias networks |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode indicated by band, 0.3 g weight, UL94V-0 epoxy body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; grounded node in reverse-bias regulation | Connected to lower-potential rail (e.g., GND) when used as shunt regulator or clamp |
| Cathode | Current exit terminal in forward bias; high-side connection in reverse-bias operation | Connected to protected line (e.g., 5 V rail) to clamp overvoltage to 5.1 V |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables accurate 5 V rail clamping without post-production calibration in consumer power supplies |
| 25 °C/W thermal resistance | Allows direct lead heat sinking to PCB copper for sustained 2 W operation without thermal derating |
| 7.0 Ω dynamic impedance at 49 mA | Maintains <±0.35 V output variation across 20–100 mA load current in regulated mode |
| UL94V-0 void-free epoxy case | Provides mechanical robustness and flame resistance in enclosed industrial enclosures |
Applications
| Automotive Body Control Module | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting microcontroller I/O pins from load-dump spikes on 5 V sensor bus lines. IC Role / Device Role / Timing Role: Shunt clamping diode limiting transient voltage to ≤5.1 V during relay coil de-energization. Use Value: Prevents latch-up and gate oxide damage in 5 V logic ICs exposed to 100 V/100 ms load dump events. | Use Scenario: Safeguarding analog input front-end of 24 V-powered PLC modules against ESD and inductive kickback. IC Role / Device Role / Timing Role: Low-leakage Zener reference and transient suppressor on signal conditioning path. Use Value: Maintains ≤10 µA reverse leakage at 1.0 V to avoid offset error in 16-bit ADC reference dividers. |
| Consumer USB-C Power Delivery Adapter | Telecom Base Station Monitoring Circuit |
Use Scenario: Regulating auxiliary 5 V bias rail for USB PD controller and level-shifters. IC Role / Device Role / Timing Role: Precision shunt regulator providing stable 5.1 V reference under variable load. Use Value: Delivers ±2% voltage accuracy across -40°C to +85°C, eliminating need for external trimming. | Use Scenario: Clamping voltage on remote temperature sensor lines exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS protecting RS-485 receiver inputs against 1 kV/1.2/50 µs transients. Use Value: Withstands 890 mA surge current without degradation, meeting IEC 61000-4-5 Level 3 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C5V1,115 | 300 mW rating, SOT-23 package, 5% tolerance, 100 Ω dynamic impedance | Lower power handling limits use to signal-level biasing, not rail clamping | Select for space-constrained low-current references where 2 W surge capability is unnecessary |
| 1N4733A | 1 W rating, DO-41 package, 5% tolerance, 7 Ω dynamic impedance, 170 mA IZM | Larger through-hole footprint and halved surge capacity restricts use in high-density automotive PCBs | Choose for legacy through-hole designs requiring same 5.1 V regulation but without SMA thermal performance |
Compared with BZX84-C5V1,115 and 1N4733A, the SMAJ4733CE3/TR13 offers double the power rating, ±2% tolerance, and 5× higher surge current in a surface-mount package-making it optimal for modern 5 V rail protection where thermal management and precision are critical.
Availability
SMAJ4733CE3/TR13 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input stages, and USB-C power adapter auxiliary rails requiring stable component supply with full traceability and RoHS compliance.
Supply support for SMAJ4733CE3/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, and rectifiers, with ISO 9001-certified production and global distribution.
The SMAJ47xxA series is designed specifically for high-reliability DC voltage regulation and transient suppression in space-constrained, thermally demanding environments such as automotive electronics and industrial control systems.
FAQ
What is the Zener voltage tolerance of SMAJ4733CE3/TR13?
The SMAJ4733CE3/TR13 has a Zener voltage tolerance of ±2%, specified at 5.1 V nominal with 49 mA test current (IZT). This tighter tolerance compared to standard 5% Zeners allows more precise regulation in 5 V power rails and reference circuits without additional trimming components. The 'C' suffix in the part number explicitly denotes the 2% tolerance grade per the SM Semiconductor datasheet.
What is the maximum steady-state power dissipation for SMAJ4733CE3/TR13?
The SMAJ4733CE3/TR13 is rated for 2.0 W steady-state power dissipation at 25°C ambient, with thermal resistance junction-to-lead of 25°C/W. This enables reliable operation up to 100°C case temperature when mounted on adequate PCB copper area. Derating is required above 25°C per the published thermal curve, reaching ~1.0 W at 75°C ambient.
How does the surge current rating of SMAJ4733CE3/TR13 compare to standard Zener diodes?
The SMAJ4733CE3/TR13 supports 890 mA peak surge current under 1/2-sine 120 Hz waveform (per IEC 61000-4-5 test conditions), significantly exceeding typical 1 W Zeners like 1N4733A (170 mA). This high surge capability stems from its 2.0 W construction and optimized SMA package thermal path, making SMAJ4733CE3/TR13 suitable for automotive load-dump and industrial inductive switching protection.
Is SMAJ4733CE3/TR13 RoHS compliant and lead-free?
Yes, SMAJ4733CE3/TR13 uses ROHS-compliant annealed matte-tin plating on terminals, fully compliant with EU RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1. The device is marked "CE3" per SM Semiconductor's coding system, indicating RoHS-compliant finish and tape-and-reel packaging (TR13 = 3,000 pcs per reel).
What is the reverse leakage current specification for SMAJ4733CE3/TR13?
The SMAJ4733CE3/TR13 specifies maximum reverse leakage current of 10 µA at 1.0 V reverse voltage (VR), measured at 25°C. This low leakage supports minimal quiescent current draw in battery-powered sensor nodes and avoids loading errors in high-impedance reference divider networks. Leakage remains below 50 µA up to VR = 3.0 V per the family characterization data.
SMAJ4733CE3/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):
- 5.1 V
- Tolerance:
- ±2%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 7 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
SMAJ4733CE3/TR13 FAQ
1.How can I place an order for SMAJ4733CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4733CE3/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 SMAJ4733CE3/TR13 reliable?
The price and inventory of SMAJ4733CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4733CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4733CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4733CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4733CE3/TR13?
SMAJ4733CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4733CE3/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 SMAJ4733CE3/TR13?
For technical support, including SMAJ4733CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4733CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4733CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4733CE3/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 SMAJ4733CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4733CE3/TR13?
All SMAJ4733CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4733CE3/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 SMAJ4733CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4733CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4733CE3/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
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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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