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Microchip Technology SMAJ4740CE3/TR13
- Part No.:
- SMAJ4740CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4740CE3/TR13.pdf
- Description:
- DIODE ZENER 10V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,865
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Product details
Overview
SMAJ4740CE3/TR13 from Vishay Semiconductor is a 10 V, ±2% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation and 182 mA maximum regulator current at 100°C, used for precision voltage regulation and transient overvoltage protection in low-profile power rails and signal lines.
For engineers reviewing the SMAJ4740CE3/TR13 datasheet, SMAJ4740CE3/TR13 pinout, SMAJ4740CE3/TR13 application, or SMAJ4740CE3/TR13 equivalent, key selection factors include its 10.0 V nominal breakdown voltage at 25 mA test current, 7.0 Ω dynamic impedance, 0.25 mA knee current, 10 µA reverse leakage at 7.6 V, and compliance with UL94V-0 epoxy encapsulation.
Technical Context
This Zener diode operates in reverse breakdown to clamp transient voltages and regulate DC reference levels. Its 2.0 W power rating enables sustained dissipation under moderate surge conditions, while the 2% voltage tolerance (C suffix) supports tighter system-level voltage margining than standard 5% or 10% variants.
The SMA (DO-214AC) surface-mount package provides thermal resistance of 25 °C/W junction-to-lead, enabling effective heat transfer to PCB copper when mounted with adequate pad area. Cathode polarity is marked by a band on the body, and the device is RoHS-compliant with matte-tin plating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 10.0 V at 25 mA test current - defines precise clamping threshold for overvoltage protection and reference generation |
| Tolerance | ±2% - ensures tight voltage accuracy critical for regulated supply monitoring and feedback loops |
| Power Dissipation | 2.0 W steady-state - supports continuous regulation without derating in compact layouts with thermal relief |
| Dynamic Impedance | 7.0 Ω at IZT - maintains stable clamping voltage under varying load currents |
| Knee Current | 0.25 mA - enables usable regulation onset at very low bias currents |
| Reverse Leakage | 10 µA at 7.6 V - minimizes standby power loss in always-on protection circuits |
| Surge Current | 454 mA (8.3 ms half-sine) - withstands common IEC 61000-4-5 Level 3 transients |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, void-free thermosetting epoxy case meeting UL94V-0; cathode indicated by band; weight ≈ 0.3 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or lower-potential rail during Zener operation; carries full surge current during clamping |
| Cathode | Reverse-biased breakdown terminal / regulated output node | Connected to protected line; defines clamping voltage relative to anode; marked by band on body |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables accurate voltage referencing in feedback networks without external trimming components |
| 2.0 W steady-state power rating | Supports continuous operation in 5 V–12 V rail protection without forced airflow or heatsinking |
| UL94V-0 epoxy encapsulation | Meets flammability requirements for industrial and automotive end-equipment enclosures |
| RoHS-compliant matte-tin plating | Ensures reliable solder wetting and intermetallic formation per MIL-STD-750 Method 2026 |
Applications
| Industrial Sensor Signal Protection | Automotive Body Control Module Power Rail |
|---|---|
Use Scenario: Protecting analog sensor outputs (e.g., temperature, pressure) from ESD and load-dump transients in factory automation systems. IC Role / Device Role / Timing Role: Zener clamping diode placed between signal line and ground to limit voltage excursions to ≤10.2 V. Use Value: Prevents damage to 12-bit ADC inputs and preserves measurement integrity under ±8 kV contact ESD per IEC 61000-4-2. | Use Scenario: Regulating and stabilizing 12 V supply to microcontroller peripherals in BCM modules exposed to alternator load dump. IC Role / Device Role / Timing Role: Shunt regulator maintaining stable 10 V reference for internal LDOs and reset circuitry. Use Value: Sustains operation during 35 V/100 ms load dump events per ISO 7637-2 Pulse 5a without brownout. |
| Consumer USB Port ESD Clamp | Telecom DSL Line Transient Suppression |
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines in set-top boxes and streaming devices. IC Role / Device Role / Timing Role: Low-capacitance Zener clamp referenced to ground, placed after primary TVS array. Use Value: Limits residual voltage to <12 V during ±15 kV air discharge, preserving USB PHY integrity without signal distortion. | Use Scenario: Overvoltage suppression on twisted-pair DSL line interface cards subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary shunt protector on line-side transformer secondary winding. Use Value: Absorbs 454 mA peak surge (8.3 ms) per IEC 61000-4-5, preventing transformer saturation and codec latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation and transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C10 | 300 mW SOT-23 package; 10% tolerance; higher ZZT (20 Ω) | Lower power handling limits use to signal-level clamping only | Select for space-constrained logic-level protection where 2.0 W rating is unnecessary |
| SMLJ10A | 1500 W peak power; 10% tolerance; DO-214AB package; higher IZSM (100 A) | Designed for high-energy surge suppression, not precision regulation | Select when protecting against lightning surges rather than maintaining tight DC voltage references |
Compared with BZX84-C10 and SMLJ10A, the SMAJ4740CE3/TR13 uniquely balances ±2% voltage accuracy, 2.0 W continuous dissipation, and SMA footprint-making it optimal for mid-power regulated supplies and hybrid ESD/surge protection where both precision and robustness are required.
Availability
SMAJ4740CE3/TR13 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, consumer USB port protection, and telecom DSL line suppression requiring stable component supply and traceable sourcing.
Supply support for SMAJ4740CE3/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
Vishay Semiconductor is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for industrial, automotive, and computing markets.
The SMAJ47xx series is designed for precision voltage regulation and transient suppression in space-constrained, thermally demanding environments-targeting applications where stable Zener performance across temperature and current is essential.
FAQ
What is the nominal Zener voltage and tolerance of SMAJ4740CE3/TR13?
The SMAJ4740CE3/TR13 has a nominal Zener voltage of 10.0 V at 25 mA test current with a ±2% tolerance, confirmed by the 'C' suffix in the part number per Vishay's documentation. This tolerance ensures consistent clamping behavior across production lots and supports designs requiring tighter voltage margins than standard 5% or 10% Zeners. The SMAJ4740CE3/TR13 maintains this specification over its full operating temperature range of –65 °C to +150 °C.
What is the maximum steady-state power dissipation rating for SMAJ4740CE3/TR13?
The SMAJ4740CE3/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 allows the device to sustain continuous regulation in compact PCB layouts when mounted with sufficient copper area for heat spreading. Derating is required above 25 °C per the specified thermal resistance, and the SMAJ4740CE3/TR13 achieves 182 mA maximum regulator current at 100 °C case temperature.
Does SMAJ4740CE3/TR13 meet RoHS and flammability standards?
Yes, the SMAJ4740CE3/TR13 features RoHS-compliant annealed matte-tin plating on its terminals and a void-free thermosetting epoxy case rated UL94V-0 for flammability. These attributes are explicitly stated in the Vishay datasheet and verified through standardized testing per MIL-STD-750 Method 2026 for solderability and UL 94 for combustion resistance. The SMAJ4740CE3/TR13 is suitable for use in environmentally regulated industrial and automotive applications.
What is the reverse leakage current specification for SMAJ4740CE3/TR13?
The SMAJ4740CE3/TR13 specifies a maximum reverse leakage current of 10 µA at 7.6 V (76% of nominal Zener voltage), measured at 25 °C. This low leakage supports energy-efficient operation in battery-powered or always-on protection circuits. The parameter is defined in Table 1 of the official Vishay datasheet and reflects the device's ability to minimize standby power loss while maintaining reliable breakdown characteristics.
How does the SMAJ4740CE3/TR13 differ from the SMAJ4740A variant?
The SMAJ4740CE3/TR13 differs from SMAJ4740A primarily in tolerance and packaging: 'C' denotes ±2% Zener voltage tolerance versus 'A' for ±5%, and 'E3/TR13' indicates lead-free, RoHS-compliant construction in tape-and-reel format. Both share identical SMA (DO-214AC) package, 2.0 W power rating, and electrical characteristics except voltage tolerance. The SMAJ4740CE3/TR13 is intended for designs requiring tighter regulation accuracy and compliant material sourcing.
SMAJ4740CE3/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:
- ±2%
- 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
SMAJ4740CE3/TR13 FAQ
1.How can I place an order for SMAJ4740CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4740CE3/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 SMAJ4740CE3/TR13 reliable?
The price and inventory of SMAJ4740CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4740CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4740CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4740CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4740CE3/TR13?
SMAJ4740CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4740CE3/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 SMAJ4740CE3/TR13?
For technical support, including SMAJ4740CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4740CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4740CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4740CE3/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 SMAJ4740CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4740CE3/TR13?
All SMAJ4740CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4740CE3/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 SMAJ4740CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4740CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4740CE3/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
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BZT52C15-7-F
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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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BZT52C3V6LP-7
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SMAZ12-13-F
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