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Taiwan Semiconductor Corporation SMBJ9.0A
- Part No.:
- SMBJ9.0A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ9.0A.pdf
- Description:
- TVS DIODE 9VWM 15.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,511
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Product details
Overview
SMBJ9.0A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 9.0 V working stand-off voltage, 10.0–11.1 V breakdown voltage at 1 mA test current, 15.4 V maximum clamping voltage at 40 A peak impulse current, and 600 W peak pulse power rating per 10/1000 µs waveform.
For engineers reviewing the SMBJ9.0A datasheet, SMBJ9.0A pinout, SMBJ9.0A application, or SMBJ9.0A equivalent, this device is selected for robust overvoltage immunity in automotive body electronics, industrial I/O interfaces, and low-voltage DC power supply inputs where fast response (<1 ps), low leakage (<5 µA at 9.0 V), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance are required.
Technical Context
The SMBJ9.0A operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-nanosecond response to transients and stable clamping under repetitive surge stress. Its thermal design supports 150 °C maximum junction temperature and 55 °C/W junction-to-ambient thermal resistance, allowing reliable operation in compact PCB layouts without forced airflow.
It complies with JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards, and its matte tin-plated leads ensure solderability per J-STD-002. Polarity is marked by cathode band, and moisture sensitivity level is rated J-STD-020 Level 1 - suitable for standard reflow processes without dry-pack requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.0 V - Maximum continuous reverse operating voltage before significant leakage; sets safe DC rail margin for 12 V systems. |
| VBR min/max | 10.0 / 11.1 V @ 1 mA - Confirmed breakdown range ensures consistent turn-on across production lots and temperature. |
| VC @ IPP | 15.4 V @ 40 A - Clamping voltage defines worst-case voltage seen by protected IC during 10/1000 µs surge. |
| PPK | 600 W - Peak pulse power rating determines survivability against ISO 7637-2 Pulse 2b (inductive load dump) events. |
| ID @ VWM | <5 µA - Low leakage preserves battery life and avoids false triggering in high-impedance sensing circuits. |
| Response time | <1.0 ps - Enables effective suppression of ESD (IEC 61000-4-2) and fast electrical fast transients (EFT). |
| Package | DO-214AA (SMB) - Standardized surface-mount outline compatible with automated placement and reflow profiles. |
Pinout & Package
DO-214AA (SMB) package with axial polarity marking: cathode indicated by band on one end. Two-terminal device - anode and cathode only. Matte tin-plated leads meet J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes clamping path during reverse transient. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 12 V rail); conducts avalanche current when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of breakdown voltage and leakage performance across temperature and humidity stress. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery feed interruption), and Pulse 3a/3b (switching noise) - critical for automotive ECUs. |
| J-STD-020 Level 1 MSL | Enables use in standard SMT assembly without baking or special handling - reduces manufacturing overhead. |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS directives - supports environmental compliance for global OEM programs. |
| 150 °C max junction temperature | Supports operation in under-hood automotive environments and enclosed industrial enclosures without derating. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 12 V power input of BCM microcontroller from load-dump transients and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamps positive-going surges above 11.1 V while blocking normal 12 V operation. Use Value: Limits voltage to ≤15.4 V during 40 A ISO 7637-2 Pulse 2b event, preventing MCU reset or latch-up. |
Use Scenario: Safeguarding 24 V digital input channel of PLC against field-wiring ESD and inductive kickback from solenoids. IC Role / Device Role / Timing Role: Fast-clamping TVS shunts transient energy before it reaches input buffer ICs or optocouplers. Use Value: Sub-1 ps response ensures clamping occurs within first nanosecond of ESD event (IEC 61000-4-2 ±8 kV contact discharge). |
| LED Driver Power Supply Input | USB-C Port VBUS Line Protection |
Use Scenario: Shielding constant-current LED driver IC from voltage spikes induced by nearby relay switching in signage systems. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbs repetitive 600 W surges without degradation, preserving driver reliability. Use Value: 9.0 V VWM allows compatibility with 12 V nominal supplies while maintaining ≥1.0 V margin to avoid conduction during ripple. |
Use Scenario: Adding secondary overvoltage protection on USB-C VBUS line downstream of primary protection ICs. IC Role / Device Role / Timing Role: Secondary clamping element that activates if upstream protection fails or is bypassed during hot-plug events. Use Value: 15.4 V VC ensures protected PMIC or Type-C controller sees no more than 15.4 V even during worst-case 40 A surge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ9.0CA | Bidirectional version; symmetric breakdown (±10.0–11.1 V); same VWM magnitude but dual-polarity clamping. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where both polarities must be suppressed. | Select SMBJ9.0CA only when protecting bidirectional signals; SMBJ9.0A is optimal for DC power rails with defined ground reference. |
| SAC9.0 | Same VWM (9.0 V) and package (DO-214AA), but lower PPK (400 W) and higher VC (17.0 V @ 25 A); not ISO 7637-2 certified. | Suitable for cost-sensitive consumer-grade applications with lower surge severity expectations. | Choose SAC9.0 only if system-level testing confirms 400 W rating suffices and ISO 7637-2 compliance is not mandated. |
Compared with SMBJ9.0CA and SAC9.0, the SMBJ9.0A delivers verified ISO 7637-2 compliance, 600 W surge capacity, and tighter clamping (15.4 V), making it the preferred choice for automotive and industrial DC power protection where regulatory validation and worst-case voltage limiting are critical.
Availability
SMBJ9.0A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and LED driver power supply inputs requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ9.0A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMBJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing ISO 7637-2 compliance, robust thermal performance, and J-STD-020 Level 1 manufacturability.
FAQ
What is the maximum clamping voltage of SMBJ9.0A under specified surge conditions?
The SMBJ9.0A has a maximum clamping voltage (VC) of 15.4 V when subjected to a 40 A peak impulse current with a 10/1000 µs waveform at TA = 25°C. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMBJ9.0A maintains this clamping performance across its full operating temperature range, supporting robust design margins in automotive and industrial applications.
Is SMBJ9.0A suitable for protecting a 12 V automotive power rail?
Yes, the SMBJ9.0A is explicitly designed for 12 V system protection. Its 9.0 V working stand-off voltage provides ≥1.0 V margin below nominal 12 V, while its 10.0–11.1 V breakdown range ensures reliable activation during load-dump transients. The device meets ISO 7637-2 Pulse 2b requirements and sustains 600 W peak pulse power - making SMBJ9.0A appropriate for body control modules, infotainment power inputs, and other 12 V automotive subsystems.
Does SMBJ9.0A have bidirectional capability?
No, SMBJ9.0A is a unidirectional TVS diode. It clamps only positive transients relative to ground (cathode to line, anode to ground). For bidirectional protection - such as on AC-coupled data lines or floating buses - the SMBJ9.0CA variant must be used. The "A" suffix in SMBJ9.0A denotes unidirectional construction with cathode band marking; polarity must be observed during PCB layout to ensure correct clamping direction.
What is the leakage current specification for SMBJ9.0A at its working voltage?
The SMBJ9.0A exhibits a maximum blocking leakage current (ID) of 5 µA at its rated working stand-off voltage of 9.0 V and TA = 25°C. This low leakage ensures minimal power loss in battery-powered systems and avoids interference with high-impedance monitoring circuits. Leakage remains well below 10 µA across the full -55°C to +150°C operating junction temperature range, supporting stable performance in extreme environments.
What package type and mounting method does SMBJ9.0A use?
SMBJ9.0A uses the DO-214AA (SMB) surface-mount package, featuring a standardized outline with 2.54 mm lead pitch and 4.57 mm body length. It is designed for reflow soldering per J-STD-020 Level 1 moisture sensitivity, with matte tin-plated leads compliant with J-STD-002. The device supports automated pick-and-place assembly and is supplied in 3,000-piece tape-and-reel format for high-volume manufacturing.
SMBJ9.0A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- 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):
- 40A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
SMBJ9.0A FAQ
1.How can I place an order for SMBJ9.0A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ9.0A 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 SMBJ9.0A reliable?
The price and inventory of SMBJ9.0A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ9.0A is usually 5 days.
3.What payment methods are accepted for SMBJ9.0A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ9.0A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ9.0A?
SMBJ9.0A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ9.0A 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 SMBJ9.0A?
For technical support, including SMBJ9.0A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ9.0A requirements.
6.How does Aetrix verify that SMBJ9.0A is sourced from the original manufacturer or authorized distributors?
All SMBJ9.0A 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 SMBJ9.0A meets industry standards.
7.What is the process for return or replacement of SMBJ9.0A?
All SMBJ9.0A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ9.0A, 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 SMBJ9.0A part is unused and in its original packaging.
Return procedure for SMBJ9.0A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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