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Microchip Technology SMAJ4745CE3/TR13
- Part No.:
- SMAJ4745CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4745CE3/TR13.pdf
- Description:
- DIODE ZENER 16V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,152
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Product details
Overview
SMAJ4745CE3/TR13 from SM Semiconductors is a 16 V, ±2% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation and 114 mA maximum regulator current at 100°C, used for precision voltage regulation and transient overvoltage protection in DC power rails and signal lines.
For engineers reviewing the SMAJ4745CE3/TR13 datasheet, SMAJ4745CE3/TR13 pinout, SMAJ4745CE3/TR13 application, or SMAJ4745CE3/TR13 equivalent, key selection criteria include zener voltage tolerance (±2%), thermal resistance (25 °C/W), surge current capability (285 A), reverse leakage (≤5 µA at 12.2 V), and ROHS-compliant matte-tin plating for reliable solderability.
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 16.0 V nominal zener voltage at 15.5 mA test current, with dynamic impedance of 16.0 Ω and knee impedance of 700 Ω at 0.25 mA.
Designed for unidirectional transient voltage suppression, it clamps reverse surges using avalanche breakdown mechanism and maintains low forward voltage (≤1.2 V at 200 mA). Its void-free thermosetting epoxy case meets UL94V-0 flammability rating and supports high-density surface-mount or axial-lead mounting via flexible terminals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 16.0 V ±2% at 15.5 mA - ensures tight regulation tolerance for reference and clamp circuits |
| Power Dissipation | 2.0 W steady-state - supports continuous regulation without forced cooling in compact layouts |
| Surge Current | 285 A (1/2-sine, 1/120 s) - withstands high-energy transients from inductive switching |
| Reverse Leakage | ≤5 µA at 12.2 V - minimizes standby power loss in battery-backed systems |
| Thermal Resistance | 25 °C/W junction-to-lead - enables predictable thermal design with standard PCB copper pour |
| Forward Voltage | ≤1.2 V at 200 mA - allows use in low-voltage forward-bias applications like polarity protection |
| Operating Temp | -65°C to +150°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount or axial-lead compatible, cathode indicated by band, void-free UL94V-0 epoxy body, 0.3 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; low-impedance path during clamping | Connected to lower-potential node (e.g., ground or return rail) for reverse-biased operation |
| Cathode | Current exit terminal in forward bias; zener breakdown terminal in reverse bias | Connected to protected line or supply rail; carries full surge current during transient events |
Key Features
| Feature | Design Value |
|---|---|
| ±2% zener voltage tolerance | Enables precise voltage reference and clamp threshold setting without post-production trimming |
| ROHS-compliant matte-tin plating | Ensures consistent wetting and intermetallic formation during reflow or hand-soldering per MIL-STD-750 |
| UL94V-0 epoxy encapsulation | Provides flame-retardant mechanical integrity in high-reliability and safety-critical assemblies |
| Low thermal resistance (25 °C/W) | Allows direct thermal coupling to PCB copper for passive heat dissipation in space-constrained designs |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting 12 V CAN bus power input against load-dump transients up to 35 V. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between VCC and GND. Use Value: Clamps surge energy within 16.0 V ±2% window while sustaining 285 A peak current, preserving downstream PMIC and microcontroller. | Use Scenario: Shielding analog output of pressure sensor from ESD and relay-switching spikes. IC Role / Device Role / Timing Role: Zener-based shunt regulator and overvoltage clamp on 5 V sensor supply line. Use Value: Maintains ≤5 µA leakage at 12.2 V, minimizing offset error in 16-bit ADC front-end while surviving 8 kV HBM ESD events. |
| Consumer USB Port Overvoltage Clamp | Telecom Line Interface Protection |
Use Scenario: Safeguarding USB 2.0 VBUS line against hot-plug overshoot and adapter faults. IC Role / Device Role / Timing Role: Reverse-biased Zener clamp referenced to ground, placed before USB controller IC. Use Value: Responds within nanoseconds to clamp 20 V transients to ≤16.0 V, preventing latch-up in USB PHY without adding series impedance. | Use Scenario: Protecting RS-485 transceiver I/O pins from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary unidirectional TVS element on data line, coordinated with gas discharge tube (GDT) front-end. Use Value: Provides low-clamping-voltage secondary protection with 16.0 V breakdown, reducing let-through voltage to <24 V for transceiver survival. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation and transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4745A | 16 V, ±5% tolerance, DO-41 package, 1.0 W power rating | Larger footprint, higher thermal resistance (50 °C/W), lower surge rating (120 A) | Select when cost sensitivity outweighs precision and surge robustness; requires larger PCB area and heatsinking |
| BZX84-C16 | 16 V, ±5% tolerance, SOT-23 package, 300 mW power rating | Surface-mount only, limited to ≤100 mA regulator current, not rated for surge | Choose for ultra-compact low-power signal-level clamping where 2.0 W dissipation is unnecessary |
Compared with 1N4745A and BZX84-C16, SMAJ4745CE3/TR13 offers tighter tolerance, double the power handling, and 2.4× higher surge current-making it suitable for automotive and industrial applications requiring long-term stability under thermal stress and repetitive transients.
Availability
SMAJ4745CE3/TR13 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor signal conditioning, and telecom line interface protection requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SMAJ4745CE3/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 Semiconductors is a Taiwan-based manufacturer specializing in discrete semiconductors, including Zener diodes, TVS devices, rectifiers, and MOSFETs, with ISO 9001-certified production and global distribution.
The SMAJ47xxA series is designed specifically for high-reliability transient voltage suppression and precision DC voltage regulation in harsh environments, targeting automotive, industrial, and telecom infrastructure applications.
FAQ
What is the zener voltage tolerance of SMAJ4745CE3/TR13?
The SMAJ4745CE3/TR13 has a zener voltage tolerance of ±2%, specified as "C" suffix per the datasheet. This means its breakdown voltage is guaranteed between 15.68 V and 16.32 V at 15.5 mA test current, enabling tighter regulation than standard ±5% Zeners like SMAJ4745A. The SMAJ4745CE3/TR13 achieves this via tighter process control during wafer sorting and binning.
Does SMAJ4745CE3/TR13 support ROHS compliance?
Yes, SMAJ4745CE3/TR13 uses ROHS-compliant annealed matte-tin plating on its terminals, verified per J-STD-609 and tested to meet Pb-free solderability requirements per MIL-STD-750 Method 2026. The void-free thermosetting epoxy body also complies with RoHS Directive 2011/65/EU, making SMAJ4745CE3/TR13 suitable for consumer and automotive electronics with strict environmental mandates.
What is the maximum surge current rating for SMAJ4745CE3/TR13?
The SMAJ4745CE3/TR13 is rated for 285 A peak surge current under 1/2-sine wave conditions (1/120 second duration), per Table 1 in the official datasheet. This value reflects its ability to absorb high-energy transients such as automotive load dump or inductive switching spikes without degradation, provided adequate PCB copper thermal relief is implemented per the 25 °C/W junction-to-lead specification.
Can SMAJ4745CE3/TR13 be used in forward-bias applications?
Yes, SMAJ4745CE3/TR13 can operate in forward bias with a maximum instantaneous forward voltage of 1.2 V at 200 mA, per the Absolute Maximum Ratings table. This makes it suitable for polarity protection or low-drop rectification in low-current paths. However, its primary design intent and qualification are for reverse-bias Zener regulation and transient suppression-not continuous forward conduction.
What is the operating temperature range of SMAJ4745CE3/TR13?
The SMAJ4745CE3/TR13 is rated for an operating and storage temperature range of -65°C to +150°C, as confirmed in the Maximum Ratings table. This wide range supports deployment in under-hood automotive modules, industrial motor drives, and outdoor telecom equipment where ambient extremes and self-heating must be accommodated without derating beyond datasheet limits.
SMAJ4745CE3/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):
- 16 V
- Tolerance:
- ±2%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 16 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 12.2 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
SMAJ4745CE3/TR13 FAQ
1.How can I place an order for SMAJ4745CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4745CE3/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 SMAJ4745CE3/TR13 reliable?
The price and inventory of SMAJ4745CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4745CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4745CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4745CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4745CE3/TR13?
SMAJ4745CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4745CE3/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 SMAJ4745CE3/TR13?
For technical support, including SMAJ4745CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4745CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4745CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4745CE3/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 SMAJ4745CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4745CE3/TR13?
All SMAJ4745CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4745CE3/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 SMAJ4745CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4745CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4745CE3/TR13 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
-
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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