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Taiwan Semiconductor Corporation SMAJ9.0A
- Part No.:
- SMAJ9.0A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ9.0A.pdf
- Description:
- TVS DIODE 9VWM 15.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,298
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Product details
Overview
SMAJ9.0A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping fast ESD and surge transients in DC power lines. It features a 9.0 V working stand-off voltage (VWM), 10.0–11.1 V breakdown voltage (VBR) at 1 mA test current, and clamps to ≤15.4 V at 26.0 A peak impulse current under 10/1000 µs waveform.
For engineers reviewing the SMAJ9.0A datasheet, SMAJ9.0A pinout, SMAJ9.0A application, or SMAJ9.0A equivalent, this device is selected for robust overvoltage protection in low-voltage DC/DC converters, USB-powered adapters, and automotive body electronics where precise clamping and low leakage (<1 µA at 9 V) are critical.
Technical Context
The SMAJ9.0A uses a glass-passivated silicon junction optimized for sub-nanosecond response (<1.0 ps rise time from 0 V to VBR min) and low capacitance. Its unidirectional configuration provides asymmetrical conduction-low forward voltage (~3.5 V at 25 A) during surge events and high reverse blocking up to 9.0 V nominal.
Thermal performance is defined by a 150 °C maximum junction temperature and 1 W steady-state power dissipation. The device meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and inductive-switching immunity, with moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.0 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level DC rail compatibility. |
| VBR @ IT=1 mA | 10.0–11.1 V - Breakdown threshold range; ensures reliable turn-on margin above VWM for noise immunity. |
| VC @ IPPM=26.0 A | ≤15.4 V - Clamped voltage under 10/1000 µs surge; defines worst-case stress on downstream ICs. |
| PPPM | 400 W - Peak pulse power rating (10/1000 µs); supports high-energy transients without failure. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off; minimizes quiescent power loss in battery-powered systems. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with cathode band marking; compatible with automated reflow assembly. |
| TJ max | 150 °C - Maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band. Weight ≈ 0.060 g. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line (e.g., GND or return path); conducts surge current to ground during overvoltage. |
| Cathode | Reverse-blocking terminal | Connected to higher-potential side (e.g., +9 V rail); blocks normal operation but avalanches at VBR to clamp transients. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables suppression of ESD events before sensitive logic or analog circuits are damaged. |
| Glass passivated junction | Improved reliability and stable VBR over temperature and life cycle vs. non-passivated alternatives. |
| ISO 7637-2 compliance | Validated for automotive Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling). |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive; suitable for green manufacturing and export markets. |
Applications
| Automotive Body Control Module (BCM) | USB-C Power Delivery Adapter |
|---|---|
Use Scenario: Protects LIN bus transceivers and microcontroller I/O from load-dump surges and ESD during vehicle ignition cycles. IC Role / Device Role: Unidirectional TVS placed between LIN line and ground, clamping transients to ≤15.4 V while maintaining 9.0 V DC integrity. Use Value: Prevents latch-up or permanent damage to 5 V-tolerant LIN PHYs under ISO 7637-2 Pulse 1 (−100 V, 50 ms) conditions. |
Use Scenario: Shields 9 V output rail of GaN-based USB PD adapter against inductive switching spikes from synchronous rectifiers. IC Role / Device Role: Primary DC rail clamp on secondary-side output, absorbing 400 W surge energy without derating at 25 °C ambient. Use Value: Maintains <1 µA leakage at 9 V, avoiding standby current penalty in Energy Star-compliant designs. |
| Industrial DC/DC Converter | LED Driver Input Stage |
Use Scenario: Safeguards 9 V input stage of isolated 1 W flyback converter powering PLC I/O modules in factory environments. IC Role / Device Role: Standoff-rated TVS across input capacitor, triggered only during >10 V transients such as relay coil kickback. Use Value: Delivers 26.0 A peak impulse current handling with ≤15.4 V clamping, preserving MOSFET gate oxide integrity. |
Use Scenario: Suppresses 100 V/10 µs transients induced by nearby motor drives on constant-current LED driver inputs. IC Role / Device Role: First-line defense on 9 V auxiliary supply rail feeding LED controller ICs and current-sense amplifiers. Use Value: Glass passivation ensures stable VBR over 10-year field life in high-humidity lighting enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ9.0 | Bidirectional variant; symmetric VBR (10.0–12.2 V) and higher IR (5 µA @ 9 V). | Required only when bidirectional surge protection (e.g., AC-coupled signal lines) is needed. | Select SMAJ9.0A for unidirectional DC rails where low leakage and asymmetric clamping are prioritized. |
| SMBJ9.0A | Same electrical specs but in larger DO-214AA (SMB) package; 600 W PPPM rating. | Used where higher surge margin or thermal mass is required, e.g., front-end power entry. | Choose SMAJ9.0A for space-constrained PCBs with ≤400 W surge exposure; SMBJ9.0A for higher-power staging. |
Compared with SMAJ9.0 and SMBJ9.0A, the SMAJ9.0A offers optimal balance of compact DO-214AC footprint, 400 W surge capability, and ultra-low 1 µA leakage-making it preferred for dense, low-quiescent-power 9 V systems where board area and standby current are critical.
Availability
SMAJ9.0A is available at Aetrix Electronics and suitable for automotive body electronics, USB-C power adapters, industrial DC/DC converters, and LED driver input protection requiring stable component supply across production lifecycles.
Supply support for SMAJ9.0A 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, TVS diodes, and rectifiers with global AEC-Q200 qualified production lines.
The SMAJ series was developed specifically for surface-mount surge protection in automotive and industrial power systems, emphasizing fast response, ISO 7637-2 compliance, and high-reliability packaging for harsh environments.
FAQ
What is the maximum clamping voltage of the SMAJ9.0A under standard surge conditions?
The SMAJ9.0A clamps to a maximum of 15.4 V when subjected to a 10/1000 µs waveform with a peak impulse current of 26.0 A. This value is measured per JEDEC standards and guarantees predictable voltage limiting during real-world transients like ESD or inductive switching, ensuring downstream 5 V or 3.3 V ICs remain within safe operating limits. The SMAJ9.0A maintains this clamping performance across its full operating temperature range.
Is the SMAJ9.0A suitable for automotive applications requiring ISO 7637-2 compliance?
Yes, the SMAJ9.0A is explicitly validated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. Its 400 W peak pulse power rating, fast <1.0 ps response, and 150 °C junction rating enable reliable operation in automotive body control modules, infotainment power supplies, and sensor interfaces exposed to load-dump and switching transients. The SMAJ9.0A's DO-214AC package also satisfies JESD201 Class 2 whisker resistance for long-term under-hood reliability.
How does the SMAJ9.0A differ from the SMAJ9.0 variant?
The SMAJ9.0A is unidirectional with 1 µA maximum reverse leakage at 9 V, while the SMAJ9.0 is bidirectional and exhibits 5 µA leakage at the same voltage. Their breakdown ranges differ: SMAJ9.0A is 10.0–11.1 V, versus 10.0–12.2 V for SMAJ9.0. The SMAJ9.0A is intended for DC rail protection where polarity is fixed; SMAJ9.0 suits AC or floating signal lines. Both share identical DO-214AC packaging and 400 W PPPM rating.
What is the thermal derating behavior of the SMAJ9.0A above 25°C ambient?
The SMAJ9.0A's peak pulse power rating decreases linearly above 25°C ambient per the manufacturer's derating curve (Fig.2). At 85°C, its 400 W rating reduces to approximately 280 W; at 125°C, it falls to ~160 W. Steady-state power dissipation remains fixed at 1 W regardless of temperature. Designers must apply these derating factors when sizing PCB copper area or selecting placement near heat sources to maintain safe junction temperatures below 150°C.
Can the SMAJ9.0A be used in place of SMAJ8.5A or SMAJ10A in an existing design?
Substituting SMAJ9.0A for SMAJ8.5A or SMAJ10A requires verification of system-level voltage margins: SMAJ9.0A's 9.0 V VWM sits between them, offering tighter clamping than SMAJ10A (10 V VWM) but higher stand-off than SMAJ8.5A (8.5 V VWM). Its 15.4 V VC is lower than SMAJ10A's 17.0 V but higher than SMAJ8.5A's 14.4 V. No PCB changes are needed due to identical DO-214AC footprint, but functional validation under worst-case surge is recommended to confirm clamping alignment with protected IC tolerances.
SMAJ9.0A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 26A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ9.0A FAQ
1.How can I place an order for SMAJ9.0A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ9.0A 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 SMAJ9.0A reliable?
The price and inventory of SMAJ9.0A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ9.0A is usually 5 days.
3.What payment methods are accepted for SMAJ9.0A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ9.0A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ9.0A?
SMAJ9.0A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ9.0A 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 SMAJ9.0A?
For technical support, including SMAJ9.0A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ9.0A requirements.
6.How does Aetrix verify that SMAJ9.0A is sourced from the original manufacturer or authorized distributors?
All SMAJ9.0A 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 SMAJ9.0A meets industry standards.
7.What is the process for return or replacement of SMAJ9.0A?
All SMAJ9.0A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ9.0A, 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 SMAJ9.0A part is unused and in its original packaging.
Return procedure for SMAJ9.0A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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