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Microchip Technology SMAJ4744AE3/TR13
- Part No.:
- SMAJ4744AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4744AE3/TR13.pdf
- Description:
- DIODE ZENER 15V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,383
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Product details
Overview
SMAJ4744AE3/TR13 from SM Semiconductors is a 15.0 V, 5% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 132 mA maximum regulator current at 100°C, and 304 A peak surge current; used for transient voltage suppression in I/O protection circuits of industrial sensor interfaces.
For engineers reviewing the SMAJ4744AE3/TR13 datasheet, SMAJ4744AE3/TR13 pinout, SMAJ4744AE3/TR13 application, or SMAJ4744AE3/TR13 equivalent, key selection criteria include zener voltage tolerance, surge current capability, thermal resistance (25°C/W), junction-to-lead thermal path, and ROHS-compliant matte-tin plating for reliable solderability.
Technical Context
This device operates as a silicon planar Zener diode optimized for transient voltage suppression, with breakdown voltage specified at 15.0 V ±5% under 17.0 mA test current (IZT). Its 25°C/W junction-to-lead thermal resistance enables effective heat transfer to PCB copper when mounted with adequate thermal relief.
The SMAJ4744AE3/TR13 exhibits 14.0 Ω dynamic impedance at IZT and 700 Ω knee impedance at 0.25 mA, ensuring stable regulation across wide operating current ranges. Reverse leakage remains ≤5 µA at 11.4 V (VR), supporting low-power standby integrity in protected signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 15.0 V ±5% at 17.0 mA - defines clamping threshold for overvoltage events in 12–15 V rail protection |
| Power Dissipation | 2.0 W steady-state - supports continuous regulation without derating up to TJ = 150°C with proper thermal design |
| Peak Surge Current | 304 A (8/20 µs waveform) - withstands high-energy transients from inductive switching or ESD |
| Dynamic Impedance | 14.0 Ω at IZT - ensures minimal voltage deviation during fast current changes in clamp operation |
| Thermal Resistance | 25 °C/W junction-to-lead - requires direct thermal connection to PCB copper for safe 2.0 W operation |
| Reverse Leakage | ≤5 µA at 11.4 V - preserves signal integrity and low quiescent current in always-on monitoring 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 per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during forward bias; reference node during reverse breakdown | Connected to lower-potential side of protected circuit; establishes ground-referenced clamping |
| Cathode | Current source during reverse breakdown; voltage reference node | Connected to higher-potential line (e.g., VCC or signal); determines clamping level relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| 5% zener voltage tolerance | Enables precise clamping within ±0.75 V of 15.0 V, critical for compatibility with 12 V system margins |
| 2.0 W power rating with 25°C/W RθJL | Allows full-rated power handling when lead is soldered to ≥10 mm² copper area, avoiding external heatsinks |
| 304 A peak surge current (8/20 µs) | Meets IEC 61000-4-5 Level 4 (4 kV) surge immunity requirements for industrial I/O ports |
| ROHS-compliant matte-tin plating | Ensures consistent wetting and intermetallic formation during reflow, reducing cold-solder joint risk |
Applications
| Industrial Sensor Protection | Automotive Body Control Module I/O |
|---|---|
Use Scenario: Protecting analog output lines (4–20 mA) and digital inputs in factory-floor pressure/temperature sensors exposed to relay coil flyback and ESD. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between signal line and ground, clamping spikes above 15.0 V. Use Value: Prevents latch-up or damage to downstream op-amps and ADCs by limiting transient energy via 304 A surge capacity and low dynamic impedance. | Use Scenario: Safeguarding LIN bus transceiver inputs and microcontroller GPIO pins in door module ECUs subjected to load dump and jump-start surges. IC Role / Device Role / Timing Role: Standoff Zener clamp on 12 V supply rail and signal lines, activated only during overvoltage events. Use Value: Maintains functional safety by holding rail voltage below 16.5 V during 100 ms load dump, leveraging 2.0 W steady-state dissipation capability. |
| Telecom Line Interface Protection | Consumer Appliance Power Supply Clamp |
Use Scenario: Shielding RS-485 transceiver terminals in base station remote units against lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary shunt protector on differential pair, coordinated with GDT or TVS array for staged clamping. Use Value: Delivers 304 A single-pulse surge handling while maintaining <15.5 V clamping voltage (Vc), preserving signal integrity during fault conditions. | Use Scenario: Clamping secondary-side rectifier output in switch-mode power supplies for smart home hubs, where cost-sensitive overvoltage protection is required. IC Role / Device Role / Timing Role: Zener-based crowbar alternative for low-cost overvoltage cutoff, triggered at 15.0 V ±5%. Use Value: Provides predictable, repeatable trip point without control IC dependency, enabled by tight 5% tolerance and stable 14.0 Ω dynamic impedance. |
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 |
|---|---|---|---|
| 1N4744A | Same 15 V, 5% zener voltage but in DO-41 axial package; 1.0 W rating; RθJL ≈ 50°C/W | Requires through-hole mounting and larger board area; unsuitable for high-density SMT layouts | Select when legacy through-hole assembly or higher lead thermal mass is preferred over space-constrained SMT |
| SMBJ15A | Same 15 V standoff, but 600 W peak power; 100 A surge rating; larger SMB (DO-214AA) package | Designed for higher-energy transients; not drop-in due to different footprint and thermal profile | Choose for automotive load-dump compliance where 304 A is insufficient, accepting larger PCB footprint |
Compared with 1N4744A and SMBJ15A, the SMAJ4744AE3/TR13 uniquely balances 2.0 W SMT power handling, 304 A surge capability, and DO-214AC footprint-making it optimal for space-constrained industrial I/O modules requiring robust yet compact clamping.
Availability
SMAJ4744AE3/TR13 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, telecom line protection, and consumer appliance power supply clamping requiring stable component supply and ROHS-compliant manufacturing.
Supply support for SMAJ4744AE3/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, and rectifiers for industrial and automotive markets.
The SMAJ47xxA series is designed specifically for surface-mount transient voltage suppression in high-density PCB environments where thermal performance, surge robustness, and tight voltage tolerance are critical.
FAQ
What is the zener voltage tolerance of SMAJ4744AE3/TR13?
The SMAJ4744AE3/TR13 has a nominal zener voltage of 15.0 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 14.25 V and 15.75 V at 17.0 mA test current. This tighter tolerance compared to standard 10% variants ensures more predictable clamping behavior in precision protection circuits. The 'A' suffix in the part number explicitly denotes this 5% specification, confirmed in Table 1 of the official SM Semiconductors datasheet for SMAJ4728A–SMAJ4751A.
Does SMAJ4744AE3/TR13 meet ROHS requirements?
Yes, SMAJ4744AE3/TR13 uses ROHS-compliant annealed matte-tin plating on its terminals, verified per MIL-STD-750 Method 2026 for solderability. The device's thermosetting epoxy case is also void-free and UL94V-0 rated. No lead or hazardous substances exceed EU Directive 2011/65/EU limits, and the 'E3' suffix in the part number indicates ROHS-compliant packaging and finish, as documented in SM Semiconductors' mechanical data section.
What is the maximum surge current rating for SMAJ4744AE3/TR13?
The SMAJ4744AE3/TR13 is rated for 304 A peak surge current using an 8/20 µs waveform, measured at 25°C ambient. This value corresponds to the Izsm parameter in Table 1 and reflects its ability to absorb high-energy transients such as those from inductive switching or ESD. Performance assumes proper PCB thermal design; derating applies above 25°C ambient per the device's 25°C/W junction-to-lead thermal resistance.
How does the thermal resistance of SMAJ4744AE3/TR13 affect PCB layout?
The SMAJ4744AE3/TR13 has a junction-to-lead thermal resistance of 25°C/W, meaning each watt dissipated raises the junction temperature 25°C above the lead temperature. To sustain its full 2.0 W rating, the cathode and anode leads must be connected to ≥10 mm² of 1 oz copper with thermal vias. Without sufficient copper area, junction temperature exceeds 150°C, risking parametric shift or failure. This requirement directly dictates minimum pad size and copper pour design in layout.
Can SMAJ4744AE3/TR13 replace SMAJ4744A in existing designs?
Yes, SMAJ4744AE3/TR13 is a direct replacement for SMAJ4744A, sharing identical electrical specifications (15.0 V ±5%, 2.0 W, 304 A surge), package (SMA/DO-214AC), and marking. The 'E3/TR13' suffix indicates ROHS-compliant plating and tape-and-reel packaging-no circuit or layout changes are needed. Both parts comply with the same datasheet (SMAJ4728A–SMAJ4751A), and thermal, electrical, and mechanical behavior is functionally identical in production use.
SMAJ4744AE3/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):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 14 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 11.4 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
SMAJ4744AE3/TR13 FAQ
1.How can I place an order for SMAJ4744AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4744AE3/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 SMAJ4744AE3/TR13 reliable?
The price and inventory of SMAJ4744AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4744AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4744AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4744AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4744AE3/TR13?
SMAJ4744AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4744AE3/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 SMAJ4744AE3/TR13?
For technical support, including SMAJ4744AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4744AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4744AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4744AE3/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 SMAJ4744AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4744AE3/TR13?
All SMAJ4744AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4744AE3/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 SMAJ4744AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4744AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4744AE3/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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