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Microchip Technology SMAJ4751E3/TR13
- Part No.:
- SMAJ4751E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4751E3/TR13.pdf
- Description:
- DIODE ZENER 30V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,953
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Product details
Overview
SMAJ4751E3/TR13 from SM Semiconductor is a 30 V, 5% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 60 mA test current, and 150 A peak surge current, used for transient voltage suppression in power rail and signal line protection.
For engineers reviewing the SMAJ4751E3/TR13 datasheet, SMAJ4751E3/TR13 pinout, SMAJ4751E3/TR13 application, or SMAJ4751E3/TR13 equivalent, key selection criteria include breakdown voltage tolerance, surge current capability, thermal resistance, and ROHS-compliant matte-tin plating for reliable solderability in high-density PCB layouts.
Technical Context
This device operates as a silicon Zener diode with sharp knee regulation at 30 V nominal breakdown voltage (VZ = 22.8–37.2 V at IZT = 8.5 mA), exhibiting 1000 Ω maximum dynamic impedance (ZZT) and 0.25 mA maximum knee current (IZK). It maintains stable regulation across -65°C to +150°C operating temperature range.
Designed for unidirectional transient suppression, it features cathode band polarity marking, void-free thermosetting epoxy case (UL94V-0), and flexible axial-lead mounting-enabling direct integration into low-profile consumer, industrial, and automotive electronics without additional clamping circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V nominal, ±5% tolerance (22.8–37.2 V), defines precise clamping threshold for overvoltage events |
| Test Current (IZT) | 8.5 mA, standard bias point for measuring VZ and ZZT, ensures repeatable characterization |
| Max Surge Current (IZSM) | 150 A (1/2 sine wave, 1/120 s), supports robust protection against lightning-induced transients |
| Power Dissipation (PM(AV)) | 2.0 W steady-state, enables continuous regulation in power supply feedback or reference paths |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead, allows direct heat conduction to PCB copper for thermal management |
| Reverse Leakage (IR) | 5 µA max at 22.8 V (VR), ensures minimal standby power loss in always-on circuits |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, void-free thermosetting epoxy case with cathode band marking and ROHS-compliant matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during normal operation; conducts when forward-biased ≥1.2 V |
| Cathode | Zener breakdown terminal | Connected to higher-potential node; clamps voltage to VZ when reverse voltage exceeds breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Ensures tight clamping accuracy for precision protection in regulated power domains |
| 2.0 W steady-state power rating | Supports sustained energy absorption in DC-biased clamp configurations without derating |
| 150 A peak surge capability | Meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial interfaces |
| UL94V-0 epoxy encapsulation | Provides flame-retardant mechanical integrity and environmental sealing in harsh environments |
| ROHS-compliant matte-tin plating | Guarantees solder joint reliability per MIL-STD-750 Method 2026, eliminating lead-based assembly risks |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Clamping |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load-dump transients up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping overvoltage spikes before they reach microcontroller power pins. Use Value: 30 V breakdown voltage provides margin above nominal rail while enabling fast response (<1 ns) to 150 A surges. | Use Scenario: Shielding analog output lines of pressure/temperature sensors from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-leakage Zener shunt regulator absorbing transients on 0–5 V or 4–20 mA signal paths. Use Value: 5 µA max reverse leakage at 22.8 V preserves signal integrity in high-impedance sensor interfaces. |
| Consumer USB Port ESD Suppression | Telecom Line Interface Protection |
Use Scenario: Safeguarding USB 2.0 data lines and VBUS against human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Fast-acting Zener clamp placed between D+/D− and ground to divert ESD current away from PHY ICs. Use Value: 25 °C/W thermal resistance enables rapid heat dissipation during repetitive 8 kV HBM discharges. | Use Scenario: Protecting RS-485 transceivers connected to long outdoor cabling exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary unidirectional suppressor on differential bus lines, coordinated with GDT secondary protection. Use Value: 1000 Ω dynamic impedance ensures stable clamping voltage under high-current surge conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4751A | Same 30 V, 5% VZ, but DO-41 through-hole package; RθJL = 50 °C/W vs. 25 °C/W | Requires axial-lead mounting and larger board area; less suitable for automated SMT assembly | Select for legacy through-hole designs where thermal mass compensates for higher thermal resistance |
| SZ1SMA4751HE3-TP | Same SMA package and 30 V rating, but 1% tolerance (D suffix); ZZT = 400 Ω max vs. 1000 Ω | Higher precision and lower impedance support tighter regulation in reference circuits, not just clamping | Select when ±1% VZ stability or sub-500 Ω dynamic impedance is required for feedback loop accuracy |
Compared with 1N4751A and SZ1SMA4751HE3-TP, SMAJ4751E3/TR13 offers optimal balance of SMT compatibility, thermal performance (25 °C/W), and cost-effective 5% tolerance-making it ideal for high-volume industrial and automotive transient suppression where strict regulation is secondary to robust surge handling.
Availability
SMAJ4751E3/TR13 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor signal clamping, consumer USB port ESD suppression, and telecom line interface protection requiring stable component supply and ROHS-compliant manufacturing.
Supply support for SMAJ4751E3/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 consumer markets.
The SMAJ47xxA series was designed specifically for surface-mount transient voltage suppression in space-constrained, high-reliability applications-emphasizing surge robustness, thermal efficiency, and solderability in automated assembly lines.
FAQ
What is the nominal Zener voltage and tolerance of SMAJ4751E3/TR13?
SMAJ4751E3/TR13 has a nominal Zener voltage of 30 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 22.8 V and 37.2 V at the specified test current of 8.5 mA. This tolerance is confirmed in Table 1 of the official SM Semiconductor datasheet (Document Number: SMAJ4728A thru SMAJ4751A). The 'A' suffix in the part numbering convention indicates 5% tolerance, and SMAJ4751E3/TR13 follows this designation.
What is the maximum peak surge current rating for SMAJ4751E3/TR13?
SMAJ4751E3/TR13 is rated for a maximum peak surge current (IZSM) of 150 A, measured using a 1/2 sine wave pulse with 1/120 second duration at 25°C ambient. This value is explicitly listed in Table 1 of the SM Semiconductor datasheet and reflects its capability to absorb high-energy transients such as those from inductive load switching or ESD events without failure.
Is SMAJ4751E3/TR13 RoHS compliant and what plating is used?
Yes, SMAJ4751E3/TR13 is RoHS compliant, with annealed matte-tin plating on its terminals that meets MIL-STD-750 Method 2026 for solderability. The datasheet confirms the plating is RoHS-compliant and readily solderable, and the 'E3' suffix in the part number denotes RoHS-compliant packaging and finish per industry-standard coding conventions.
What package type does SMAJ4751E3/TR13 use and what are its key mechanical features?
SMAJ4751E3/TR13 uses the SMA (DO-214AC) surface-mount package, featuring a void-free thermosetting epoxy body rated UL94V-0 for flame resistance, cathode band polarity marking, and approximate weight of 0.3 g. Its dimensions, lead configuration, and molding specifications are fully defined in the Mechanical Data section of the SM Semiconductor datasheet.
How does the thermal resistance of SMAJ4751E3/TR13 impact its power handling capability?
SMAJ4751E3/TR13 has a junction-to-lead thermal resistance (RθJL) of 25 °C/W, enabling efficient heat transfer from the die to the PCB copper via the leads. This allows the device to sustain its full 2.0 W steady-state power dissipation without external heatsinking when mounted on adequate copper area-critical for reliable operation in compact, thermally constrained designs like automotive control modules.
SMAJ4751E3/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:
- ±10%
- 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
SMAJ4751E3/TR13 FAQ
1.How can I place an order for SMAJ4751E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4751E3/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 SMAJ4751E3/TR13 reliable?
The price and inventory of SMAJ4751E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4751E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4751E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4751E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4751E3/TR13?
SMAJ4751E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4751E3/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 SMAJ4751E3/TR13?
For technical support, including SMAJ4751E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4751E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4751E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4751E3/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 SMAJ4751E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4751E3/TR13?
All SMAJ4751E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4751E3/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 SMAJ4751E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4751E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4751E3/TR13 Tags
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MM5Z5V1ST1G
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