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Taiwan Semiconductor Corporation 1SMA4744
- Part No.:
- 1SMA4744
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA4744.pdf
- Description:
- DIODE ZENER 15V 1.25W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:190,309
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Product details
Overview
1SMA4744 from Taiwan Semiconductor is a 1W surface-mount Zener diode with a nominal zener voltage of 15 V, test current of 17 mA, dynamic impedance of 14 Ω, and maximum junction temperature of 175°C. It is used for voltage regulation and overvoltage protection in power supply rails and I/O interface circuits.
For engineers reviewing the 1SMA4744 datasheet, 1SMA4744 pinout, 1SMA4744 application, or 1SMA4744 equivalent, key selection criteria include its DO-214AC (SMA) package, ±5% voltage tolerance, low leakage current (≤1 µA at 11.4 V), and surge current capability of 304 mA under specified conditions.
Technical Context
The 1SMA4744 operates as a single-die, glass-passivated Zener diode optimized for stable reverse-bias breakdown at 15 V. Its low inductance and moisture sensitivity level 1 rating support high-reliability automated assembly on PCBs with minimal thermal derating up to 60°C.
It exhibits a typical zener impedance of 14 Ω at 17 mA and maintains leakage current ≤1 µA at 11.4 V (80% of nominal VZ). The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements in its DO-214AC molded package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ (Nominal) | 15 V ±5% - precise reference voltage for regulation within tight tolerance band |
| IZT | 17 mA - standardized test current ensuring consistent VZ measurement |
| ZZT | 14 Ω - low dynamic impedance ensures minimal voltage variation under load changes |
| PD | 1 W at 25°C - continuous power dissipation limit defining thermal design margin |
| IR @ VR | ≤1 µA at 11.4 V - low leakage preserves efficiency in high-impedance bias networks |
| TJ max | +175°C - enables operation in high-temperature industrial environments |
| Package | DO-214AC (SMA) - industry-standard SMD outline compatible with automated placement |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration with cathode indicated by a band. Weight: 0.060 g. Molding compound meets UL 94V-0; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node in reverse-bias regulation configuration |
| Cathode | Zener breakdown terminal / voltage reference output | Provides stable 15 V reference when biased above VZ; marked with band |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances long-term stability and reliability under thermal cycling and humidity exposure |
| Low inductance construction | Minimizes transient voltage overshoot during fast-switching surge events |
| Moisture sensitivity level 1 | Eliminates need for dry-pack or baking prior to reflow soldering |
| RoHS and halogen-free compliance | Meets IEC 61249-2-21 and environmental directives for green manufacturing |
Applications
| Power Supply Regulation | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing 15 V rail in DC-DC converter feedback loop or LDO reference path. IC Role / Device Role: Voltage reference element providing precision feedback to control IC. Use Value: Maintains ±5% output accuracy across temperature and load due to stable 15 V breakdown and 14 Ω ZZT. | Use Scenario: Clamping transient spikes on microcontroller I/O lines exposed to ESD or inductive kickback. IC Role / Device Role: Shunt protection device diverting excess energy to ground. Use Value: Responds within nanoseconds with ≤1 µA leakage at 11.4 V, preserving signal integrity during normal operation. |
| Industrial Sensor Interface | Automotive Body Control Module |
Use Scenario: Biasing analog sensor outputs (e.g., pressure transducers) requiring stable excitation voltage. IC Role / Device Role: Precision voltage source for sensor bridge excitation. Use Value: Delivers 15 V reference with <1 µA leakage, minimizing offset error in high-impedance sensor circuits. | Use Scenario: Regulating auxiliary 15 V supply for LIN transceivers or LED drivers in BCM subassemblies. IC Role / Device Role: Secondary voltage clamp and regulator in 12 V automotive systems. Use Value: Withstands junction temperatures up to +175°C and surge currents up to 304 mA, meeting AEC-Q200 stress requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | Same 15 V nominal VZ, but in DO-41 through-hole package; higher ZZT (16 Ω vs. 14 Ω); 1 W rating | Requires PCB through-hole layout; unsuitable for high-density SMT designs | Select 1SMA4744 for space-constrained SMT boards; choose 1N4744A only if legacy through-hole compatibility is required |
| BZX84-C15 | SOT-23 package; 15 V ±5%; lower power rating (300 mW); ZZT = 30 Ω at 5 mA | Limited to low-power signal-level clamping; not rated for 1 W continuous dissipation | Use BZX84-C15 only in battery-powered or low-current signal paths; 1SMA4744 remains preferred for power rail regulation |
Compared with 1N4744A and BZX84-C15, the 1SMA4744 offers superior thermal performance in SMT layouts, lower dynamic impedance for tighter regulation, and full 1 W dissipation capability-making it the optimal choice for industrial and automotive power conditioning where board space and reliability are critical.
Availability
1SMA4744 is available at Aetrix Electronics and suitable for power supply regulation, overvoltage protection, and industrial sensor interface applications requiring stable component supply and RoHS-compliant sourcing.
Supply support for 1SMA4744 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, rectifiers, and protection components with global distribution and AEC-Q200 qualified product lines.
The 1SMA47xx series is designed specifically for surface-mount voltage regulation and transient suppression in industrial, computing, and automotive subsystems where reliability, thermal robustness, and automated assembly compatibility are essential.
FAQ
What is the nominal zener voltage and tolerance of the 1SMA4744?
The 1SMA4744 has a nominal zener voltage of 15 V with a standard tolerance of ±5%, measured at 17 mA test current and 30°C lead temperature. This specification ensures predictable regulation behavior across production lots and operating conditions, making the 1SMA4744 suitable for precision reference applications where voltage stability is critical.
What is the maximum power dissipation of the 1SMA4744 at 60°C ambient temperature?
The 1SMA4744 delivers 1.25 W maximum power dissipation at 60°C ambient temperature when mounted on a PCB with appropriate copper pad area (5 mm × 5 mm), per its power derating curve. At 25°C, it sustains 1 W continuously. This thermal performance allows the 1SMA4744 to operate reliably in enclosed industrial enclosures without forced cooling.
Does the 1SMA4744 meet RoHS and halogen-free requirements?
Yes, the 1SMA4744 is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound, plating, and internal materials are certified to these environmental standards, enabling use in consumer, medical, and industrial products subject to strict material declarations and sustainability mandates.
What is the surge current rating of the 1SMA4744 and under what conditions is it specified?
The 1SMA4744 supports a non-repetitive peak forward surge current (IFSM) of 30 A for an 8.3 ms half-sine wave, and a reverse surge current of 304 mA at 11.4 V (80% of VZ). These ratings are defined per JEDEC standards and validated under controlled thermal pre-conditioning, confirming the 1SMA4744's suitability for transient suppression in real-world power line and I/O interface scenarios.
How is polarity indicated on the 1SMA4744 package, and what is its mechanical outline?
Polarity on the 1SMA4744 is indicated by a cathode band on the DO-214AC (SMA) package body. Its mechanical outline conforms to JEDEC DO-214AC standards, with overall dimensions of 4.5 × 2.7 × 2.1 mm and matte tin-plated leads solderable per J-STD-002. This standardized footprint ensures compatibility with pick-and-place equipment and reflow profiles used for the 1SMA4744 in high-volume manufacturing.
1SMA4744 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 14 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 11.4 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
1SMA4744 FAQ
1.How can I place an order for 1SMA4744 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA4744 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 1SMA4744 reliable?
The price and inventory of 1SMA4744 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA4744 is usually 5 days.
3.What payment methods are accepted for 1SMA4744?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA4744 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA4744?
1SMA4744 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA4744 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 1SMA4744?
For technical support, including 1SMA4744 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA4744 requirements.
6.How does Aetrix verify that 1SMA4744 is sourced from the original manufacturer or authorized distributors?
All 1SMA4744 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 1SMA4744 meets industry standards.
7.What is the process for return or replacement of 1SMA4744?
All 1SMA4744 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA4744, 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 1SMA4744 part is unused and in its original packaging.
Return procedure for 1SMA4744:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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