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Microchip Technology SMAJ4751CE3/TR13
- Part No.:
- SMAJ4751CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4751CE3/TR13.pdf
- Description:
- DIODE ZENER 30V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,358
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Product details
Overview
SMAJ4751CE3/TR13 from SM Semiconductor is a 30 V, 2.0 W silicon Zener diode designed for transient voltage suppression in low-profile PCB layouts. It features 2% voltage tolerance, 8.5 mA test current, 40 Ω dynamic impedance at IZT, 5 µA reverse leakage at 22.8 V, and operates from –65 °C to +150 °C. It protects signal lines in automotive sensor units against inductive switching transients.
For engineers reviewing the SMAJ4751CE3/TR13 datasheet, SMAJ4751CE3/TR13 pinout, SMAJ4751CE3/TR13 application, or SMAJ4751CE3/TR13 equivalent, key selection criteria include Zener voltage tolerance (2%), surge current rating (150 mA), thermal resistance (25 °C/W), junction-to-lead thermal path, and DO-214AC package compatibility with high-density mounting.
Technical Context
This device functions as a precision voltage clamp in reverse-biased operation, maintaining regulation across a broad current range (IZK = 0.25 mA to IZM = 60 mA) and temperature span. Its 2% tolerance ('C' suffix) and low dynamic impedance (40 Ω at 8.5 mA) ensure stable reference behavior under varying load and thermal conditions.
The SMAJ4751CE3/TR13 uses a void-free thermosetting epoxy case (UL94V-0 rated) with matte-tin-plated axial leads and cathode band polarity marking. Thermal resistance of 25 °C/W from junction to lead enables reliable power dissipation up to 2.0 W when properly heat-sunk on PCB copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 30.0 V ±2% at 8.5 mA - precise clamping threshold for overvoltage protection circuits |
| Power Dissipation PM(AV) | 2.0 W steady-state - supports continuous transient suppression without derating in standard layouts |
| Dynamic Impedance ZZT | 40 Ω at IZT - ensures minimal voltage deviation during fast current changes |
| Reverse Leakage IR | 5 µA at VR = 22.8 V - guarantees low standby power loss in always-on protection paths |
| Surge Current Izsm | 150 mA (1/2 sine wave, 1/120 s) - withstands common inductive switching transients |
| Thermal Resistance RθJL | 25 °C/W - enables effective heat transfer to PCB copper via axial leads |
| Operating Temperature | –65 °C to +150 °C - qualified for under-hood automotive and industrial environments |
Pinout & Package
Package: DO-214AC (SMA), surface-mount compatible axial-lead outline with cathode band marking and 0.3 g mass. Void-free UL94V-0 epoxy body, matte-tin-plated leads per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; reference node in reverse-bias clamp | Connected to lower-potential side of protected circuit (e.g., GND or signal return) |
| Cathode | Clamping output node in reverse bias; voltage reference terminal | Connected to protected line (e.g., sensor output or MCU input); band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 2% Zener voltage tolerance | Enables tighter clamping window vs. 5% or 10% variants, reducing design margin uncertainty |
| 25 °C/W junction-to-lead thermal resistance | Allows full 2.0 W power handling with minimal PCB copper area, supporting compact designs |
| UL94V-0 epoxy encapsulation | Meets flammability safety requirements for automotive and industrial end equipment |
| Cathode band polarity marking | Ensures unambiguous orientation during automated or manual placement on DO-214AC footprint |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of engine coolant temperature sensors exposed to load-dump and inductive kickback. IC Role / Device Role / Timing Role: Voltage clamp limiting transient excursions to ≤30 V, preserving ADC input integrity. Use Value: Prevents latch-up or damage to downstream microcontroller inputs during 12 V system transients. | Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from relay coil flyback. IC Role / Device Role / Timing Role: Fast-acting shunt suppressor diverting surge energy away from optocoupler input stages. Use Value: Extends field reliability by eliminating false triggering and component degradation from repetitive 400 V/100 ns spikes. |
| Consumer Audio Line Protection | Telecom Interface ESD Suppression |
Use Scenario: Safeguarding line-level audio outputs in smart speakers from accidental DC coupling or hot-plug surges. IC Role / Device Role / Timing Role: Low-leakage Zener clamp holding signal path below 30 V while passing 20 kHz audio bandwidth. Use Value: Maintains signal fidelity with <5 µA reverse current at 22.8 V, avoiding DC offset or distortion. | Use Scenario: Adding secondary overvoltage protection on RS-485 bus lines in base station control modules. IC Role / Device Role / Timing Role: Standby regulator that activates only during >30 V transients, complementing primary TVS arrays. Use Value: Provides redundant clamping with known 2% VZ accuracy, improving system-level surge immunity compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4751A | 10% VZ tolerance (vs. 2% for SMAJ4751CE3/TR13); same 30 V nominal, DO-41 package | Larger through-hole footprint; higher thermal resistance (~65 °C/W) | Select when cost sensitivity outweighs precision and space constraints |
| BZX84-C30 | 30 V ±5%, SOT-23 package, 300 mW rating, 85 °C/W thermal resistance | Lower power handling; suited for signal-level, not power-line, transients | Choose for ultra-compact, low-energy protection where 2.0 W surge capability is unnecessary |
Compared with 1N4751A and BZX84-C30, the SMAJ4751CE3/TR13 delivers tighter voltage control, superior thermal performance, and higher surge robustness in a low-profile surface-mount package-making it optimal for automotive and industrial applications demanding repeatable clamping and board-space efficiency.
Availability
SMAJ4751CE3/TR13 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom interface protection requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ4751CE3/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, rectifiers, and bridge rectifiers for industrial and automotive markets.
The SMAJ47xx series was developed to provide high-reliability, low-profile Zener clamps with tight tolerances and UL-certified packaging for harsh-environment transient suppression.
FAQ
What is the Zener voltage tolerance of SMAJ4751CE3/TR13?
The SMAJ4751CE3/TR13 has a Zener voltage tolerance of ±2%, indicated by the 'C' suffix in its part number. This means its breakdown voltage is guaranteed between 29.4 V and 30.6 V at 8.5 mA test current and 25 °C ambient. This tighter tolerance improves predictability in precision clamping applications compared to standard 5% or 10% variants. The SMAJ4751CE3/TR13 achieves this via post-package sorting and screening per manufacturer specifications.
How does SMAJ4751CE3/TR13 differ from SMAJ4751A?
The SMAJ4751CE3/TR13 differs from SMAJ4751A primarily in tolerance and packaging: 'C' denotes ±2% VZ tolerance versus 'A' (±5%), and 'E3/TR13' indicates RoHS-compliant matte-tin plating and tape-and-reel packaging. Both share identical DO-214AC (SMA) package, 30 V nominal voltage, and 2.0 W power rating. The SMAJ4751CE3/TR13 is optimized for automated SMT assembly and high-reliability automotive use cases.
What is the maximum surge current rating for SMAJ4751CE3/TR13?
The SMAJ4751CE3/TR13 has a peak surge current (Izsm) rating of 150 mA, measured using a 1/2 sine wave pulse of 1/120 second duration at 25 °C ambient. This rating reflects its ability to absorb transient energy from inductive load switching or ESD events without failure. Derating applies above 25 °C; the SMAJ4751CE3/TR13 maintains functional integrity under repeated surges when mounted on adequate PCB copper for thermal relief.
Can SMAJ4751CE3/TR13 be used in place of a standard 1N4751A?
The SMAJ4751CE3/TR13 is not a direct drop-in replacement for 1N4751A due to package and thermal differences: SMAJ4751CE3/TR13 uses DO-214AC (SMA), while 1N4751A uses DO-41. Though both are 30 V Zeners, the SMAJ4751CE3/TR13 offers ±2% tolerance and lower thermal resistance (25 °C/W vs. ~65 °C/W). Layout redesign is required. The SMAJ4751CE3/TR13 suits space-constrained, high-reliability applications where the 1N4751A's through-hole form factor is unsuitable.
What is the reverse leakage current specification for SMAJ4751CE3/TR13?
The SMAJ4751CE3/TR13 specifies a maximum reverse leakage current (IR) of 5 µA at VR = 22.8 V and 25 °C. This low leakage ensures minimal power loss and signal perturbation in always-connected protection circuits. The value is verified per JEDEC test conditions and remains stable across its –65 °C to +150 °C operating range. Designers can rely on this parameter when calculating total system quiescent current, especially in battery-powered sensor nodes using the SMAJ4751CE3/TR13.
SMAJ4751CE3/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):
- 30 V
- Tolerance:
- ±2%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 22.8 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
SMAJ4751CE3/TR13 FAQ
1.How can I place an order for SMAJ4751CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4751CE3/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 SMAJ4751CE3/TR13 reliable?
The price and inventory of SMAJ4751CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4751CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4751CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4751CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4751CE3/TR13?
SMAJ4751CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4751CE3/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 SMAJ4751CE3/TR13?
For technical support, including SMAJ4751CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4751CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4751CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4751CE3/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 SMAJ4751CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4751CE3/TR13?
All SMAJ4751CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4751CE3/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 SMAJ4751CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4751CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4751CE3/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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