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Microchip Technology SMAJ4740AE3/TR13
- Part No.:
- SMAJ4740AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4740AE3/TR13.pdf
- Description:
- DIODE ZENER 10V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,045
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Product details
Overview
SMAJ4740AE3/TR13 from SM Semiconductor is a 10.0 V, ±5% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 182 mA maximum regulator current at 100°C, and 454 mA peak surge current. It serves as a precision voltage reference and transient voltage suppressor in low-profile power rail regulation and ESD protection circuits.
For engineers reviewing the SMAJ4740AE3/TR13 datasheet, SMAJ4740AE3/TR13 pinout, SMAJ4740AE3/TR13 application, or SMAJ4740AE3/TR13 equivalent, key selection criteria include nominal Zener voltage (10.0 V), test current (25.0 mA), dynamic impedance (7.0 Ω), knee impedance (700 Ω), and thermal resistance (25 °C/W).
Technical Context
This device operates as a silicon planar Zener diode with sharp breakdown knee characteristics, verified by dual-point Zener impedance measurement per MIL-STD-750 Method 2026. Its 5% voltage tolerance (A-suffix), 100°C thermal limit, and 25 °C/W junction-to-lead thermal resistance support stable regulation under varying load and ambient conditions.
The SMAJ4740AE3/TR13 exhibits 10 µA maximum reverse leakage at 7.6 V (VR), 0.25 mA knee current (IZK), and 700 Ω maximum knee impedance - confirming low-noise, high-stability performance across its specified operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 10.0 V ±5% at 25.0 mA test current - defines precise clamping threshold for overvoltage protection |
| Power Dissipation PM(AV) | 2.0 W steady-state - supports continuous regulation without forced cooling in compact layouts |
| Dynamic Impedance ZZT | 7.0 Ω at IZT - ensures minimal voltage deviation under dynamic load transients |
| Knee Impedance ZZK | 700 Ω at 0.25 mA - confirms sharp breakdown onset for reliable low-current regulation |
| Thermal Resistance RθJL | 25 °C/W junction-to-lead - enables accurate thermal design when lead is used as heatsink |
| Surge Current Izsm | 454 mA (1/2 sine wave, 1/120 s) - withstands common inductive switching transients |
| Reverse Leakage IR | 10 µA max at 7.6 V - guarantees low standby power loss in always-on protection circuits |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, void-free thermosetting epoxy case with cathode band marking; weight ≈ 0.3 g; RoHS-compliant matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during regulation; carries full surge current in reverse-biased protection mode |
| Cathode | Zener breakdown terminal | Marked by band; connected to higher-potential rail; defines clamping reference point for overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables tighter voltage margin control vs. 10% variants, reducing design safety overhead in precision rails |
| 2.0 W power rating in SMA package | Delivers higher energy handling than SOD-123 or DO-35 Zeners of comparable footprint |
| Sharp knee impedance profile | 700 Ω at 0.25 mA ensures predictable turn-on behavior below regulation current |
| UL94V-0 epoxy encapsulation | Meets flammability requirements for industrial and automotive PCB assemblies |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Clamping |
|---|---|
Use Scenario: Protecting CAN/LIN bus interface ICs from load-dump and inductive kickback in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Primary transient voltage suppressor placed directly at connector entry point. Use Value: 10.0 V clamping threshold aligns with 12 V system rail tolerances while 454 mA surge rating handles ISO 7637-2 Pulse 1/2a events. | Use Scenario: Safeguarding analog input channels of programmable logic controllers against field-wiring transients. IC Role / Device Role / Timing Role: Front-end Zener clamp on signal conditioning path before ADC input. Use Value: 7.0 Ω dynamic impedance minimizes signal distortion during fast-rising transients up to 1 kV/µs. |
| Consumer Power Adapter Regulation | Telecom DC-DC Feedback Reference |
Use Scenario: Providing stable 10 V reference for secondary-side feedback in isolated flyback converters. IC Role / Device Role / Timing Role: Precision Zener reference in optocoupler feedback loop. Use Value: ±5% tolerance and 25 °C/W thermal resistance ensure <±2% output voltage drift over 0–70°C ambient range. | Use Scenario: Regulating bias supply for RF front-end amplifiers in base station power modules. IC Role / Device Role / Timing Role: Low-noise voltage reference for LDO pre-regulator stage. Use Value: 10 µA reverse leakage at 7.6 V prevents loading of high-impedance bias networks in sensitive RF sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740A | Same 10 V ±5%, but in DO-41 axial package; 1.0 W rating; 200 mA IZM; 500 mA Izsm | Requires through-hole mounting; lower power handling limits use in high-surge-density designs | Select when board space allows axial leads and thermal mass of PCB copper suffices for heat sinking |
| BZX84-C10 | 10 V ±5%, SOT-23 package; 300 mW rating; 20 mA IZT; 15 Ω ZZT; 100 µA IR @ 7.6 V | Lower power and surge capability; suited for signal-level rather than power-rail protection | Choose for space-constrained signal line clamping where 2.0 W dissipation is unnecessary |
Compared with 1N4740A and BZX84-C10, the SMAJ4740AE3/TR13 uniquely combines 2.0 W power rating, SMA surface-mount compatibility, and 454 mA surge capacity - making it optimal for high-density, high-reliability power rail protection where thermal management via lead soldering is feasible.
Availability
SMAJ4740AE3/TR13 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom DC-DC converter feedback circuits requiring stable component supply and long-term obsolescence resilience.
Supply support for SMAJ4740AE3/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 focus on industrial-grade reliability and AEC-Q200-aligned qualification.
The SMAJ47xxA series is designed specifically for high-power, surface-mount transient suppression and precision voltage regulation in harsh environments - emphasizing thermal robustness, tight voltage tolerance, and surge survivability.
FAQ
What is the Zener voltage tolerance of SMAJ4740AE3/TR13?
The SMAJ4740AE3/TR13 has a ±5% Zener voltage tolerance, confirmed by the "A" suffix in its part number per the manufacturer's documentation. This means its breakdown voltage is guaranteed between 9.5 V and 10.5 V at 25.0 mA test current and 25°C ambient. The SMAJ4740AE3/TR13 achieves this tighter tolerance versus standard 10% variants, supporting more precise voltage clamping in regulated power supplies and protection circuits.
What is the maximum steady-state power dissipation for SMAJ4740AE3/TR13?
The SMAJ4740AE3/TR13 is rated for 2.0 W steady-state power dissipation (PM(AV)) under specified thermal conditions. This value assumes proper PCB copper land area for heat conduction from the SMA package leads. Exceeding 2.0 W continuously without adequate thermal relief risks junction temperature exceeding 150°C, potentially degrading long-term reliability. The SMAJ4740AE3/TR13 leverages its 25 °C/W junction-to-lead thermal resistance to maintain safe operation within this limit.
Does SMAJ4740AE3/TR13 meet RoHS requirements?
Yes, the SMAJ4740AE3/TR13 uses RoHS-compliant annealed matte-tin plating on its terminals, as explicitly stated in the mechanical data section of the official datasheet. The void-free thermosetting epoxy case also complies with UL94V-0 flammability standards. No lead or other restricted substances exceed EU RoHS Directive limits, making the SMAJ4740AE3/TR13 suitable for environmentally regulated industrial and consumer applications.
What is the peak surge current rating for SMAJ4740AE3/TR13?
The SMAJ4740AE3/TR13 has a peak surge current (Izsm) rating of 454 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 switching or lightning-induced surges without failure. The SMAJ4740AE3/TR13 achieves this performance while maintaining its 10.0 V clamping level, distinguishing it from lower-rated Zener alternatives.
How is polarity indicated on SMAJ4740AE3/TR13?
Polarity on the SMAJ4740AE3/TR13 is indicated by a cathode band marked on the body of the SMA (DO-214AC) package. The banded end corresponds to the cathode terminal, which must be connected to the higher-potential side of the circuit during normal Zener operation. This marking is consistent across all SMAJ47xxA series devices and aligns with JEDEC-standard diode polarity conventions. The SMAJ4740AE3/TR13's cathode band is clearly visible under standard optical inspection.
SMAJ4740AE3/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):
- 10 V
- Tolerance:
- ±5%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 7.6 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
SMAJ4740AE3/TR13 FAQ
1.How can I place an order for SMAJ4740AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4740AE3/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 SMAJ4740AE3/TR13 reliable?
The price and inventory of SMAJ4740AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4740AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4740AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4740AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4740AE3/TR13?
SMAJ4740AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4740AE3/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 SMAJ4740AE3/TR13?
For technical support, including SMAJ4740AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4740AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4740AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4740AE3/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 SMAJ4740AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4740AE3/TR13?
All SMAJ4740AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4740AE3/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 SMAJ4740AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4740AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4740AE3/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
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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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