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Taiwan Semiconductor Corporation SMBJ12H
- Part No.:
- SMBJ12H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12H.pdf
- Description:
- 600W, 14.8V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,324
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Product details
Overview
SMBJ12H from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in automotive and industrial power rails. It features a 12V working stand-off voltage (VWM), 13.3–16.3V breakdown voltage (VBR), 22.0V clamping voltage (VC) at 28.0A peak pulse current (IPP), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SMBJ12H datasheet, SMBJ12H pinout, SMBJ12H application, or SMBJ12H equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, leakage current ≤1µA at 12V, junction temperature range (−55°C to +150°C), and compatibility with automated SMT placement on 1.5mm pitch PCBs.
Technical Context
The SMBJ12H employs a glass-passivated silicon junction optimized for fast transient response (<1.0ps) and low capacitance (typ. <100pF at 0V). Its unidirectional configuration provides forward conduction only during reverse overvoltage events, enabling robust protection of DC power inputs without interfering with normal forward bias operation.
Thermal design is supported by RθJC = 10°C/W and RθJA = 55°C/W, allowing sustained 3W steady-state dissipation at 25°C ambient. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for high-reliability board-level integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous DC or RMS voltage the device blocks without significant leakage |
| VBR min/max | 13.3 V / 16.3 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold tolerance |
| VC @ IPP | 22.0 V at 28.0 A - Clamped voltage seen by protected circuit during 10/1000µs surge, limiting downstream stress |
| PPK | 600 W - Peak non-repetitive impulse power handling capability per IEC 61000-4-5 and ISO 7637-2 |
| ID @ VWM | ≤1 µA - Low leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures without derating |
| Package | DO-214AA (SMB) - Standardized 3.5mm × 4.5mm surface-mount outline compatible with IPC-7351B footprint |
Pinout & Package
DO-214AA (SMB) package with cathode band marking on one end; two-terminal unidirectional configuration. Cathode terminal connects to system ground or return path; anode connects to protected line.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Protected line input | Connected to DC supply rail or signal line requiring transient suppression |
| Cathode (banded end) | Clamp reference node | Must be tied to low-impedance ground plane to ensure effective voltage clamping during surges |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives, critical for humid environments |
| ISO 7637-2 compliance | Guarantees immunity to standardized automotive transients (Pulse 1, 2a, 2b, 3a, 3b) without external filtering |
| Moisture sensitivity level 1 | Enables unlimited floor life before reflow; no baking required prior to assembly |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive Power Rail Protection | Industrial DC Input Protection |
|---|---|
Use Scenario: 12V battery-fed ECUs exposed to load dump and alternator ripple in passenger vehicles. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power input, placed upstream of LDOs and microcontrollers. Use Value: Limits transient excursions to ≤22.0V, preventing latch-up or gate oxide damage in 3.3V/5V logic supplies. |
Use Scenario: 24V PLC I/O modules subjected to inductive switching spikes from solenoid drivers. IC Role / Device Role / Timing Role: Standoff protector across DC input terminals, absorbing energy from relay coil flyback. Use Value: Withstands 600W pulses while maintaining <1µA leakage at nominal 24V system voltage. |
| LED Driver Surge Suppression | ESD-Sensitive Interface Protection |
Use Scenario: Constant-current LED drivers in street lighting systems encountering lightning-induced surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to shunt high-voltage transients away from LED strings. Use Value: Fast <1.0ps response ensures clamping initiates before LED forward voltage exceeds 35V rating. |
Use Scenario: CAN transceiver power pins in vehicle infotainment head units exposed to ESD events per IEC 61000-4-2. IC Role / Device Role / Timing Role: Secondary protection stage after ferrite bead, reducing residual voltage to safe levels for PHY ICs. Use Value: 22.0V clamping voltage ensures protected ICs experience <15V overshoot during ±8kV contact discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A | Narrower VBR range (13.3–14.7V); lower VC (19.9V at 31.0A); same PPK and package | Better clamping margin for low-voltage tolerant ICs; slightly reduced surge current capacity | Select SMBJ12A when downstream logic requires tighter voltage control below 20V during transients |
| SAC12 | Same VWM/VBR specs but lower PPK (400W); different thermal resistance (RθJA = 65°C/W) | Lower power handling limits use to less severe surge environments; higher thermal impedance reduces sustained duty cycle | Choose SAC12 only for cost-sensitive consumer applications where ISO 7637-2 Pulse 5a is not required |
Compared with SMBJ12H, SMBJ12A offers improved clamping consistency at the expense of peak current margin, while SAC12 trades 33% lower surge power and higher thermal resistance for lower unit cost-making SMBJ12H the optimal choice for AEC-Q101-compliant automotive and industrial designs demanding full 600W immunity.
Availability
SMBJ12H is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, LED lighting systems, and transportation control modules requiring stable component supply across multi-year production cycles.
Supply support for SMBJ12H 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, and power MOSFETs since 1979.
The SMBJH series was developed specifically for AEC-Q101-compliant automotive transient suppression, emphasizing low clamping voltage, high surge robustness, and process-controlled VBR consistency across voltage grades.
FAQ
What is the maximum clamping voltage of SMBJ12H under standard 10/1000µs surge conditions?
The SMBJ12H has a maximum clamping voltage (VC) of 22.0 V when subjected to a 28.0 A peak pulse current with a 10/1000µs waveform. This value is measured per IEC 61000-4-5 and ISO 7637-2 test standards and represents the highest voltage the protected circuit will experience during such a transient event. The SMBJ12H maintains this clamping performance across its full operating temperature range of −55°C to +150°C.
Is SMBJ12H suitable for bidirectional transient protection?
No, SMBJ12H is a unidirectional TVS diode and is not rated for bidirectional operation. For bipolar applications, Taiwan Semiconductor specifies part numbers with "CH" or "CAH" suffixes (e.g., SMBJ12CH). Using SMBJ12H in reverse-biased configurations beyond its specified reverse standoff voltage may result in premature failure or inconsistent clamping behavior. Always verify polarity alignment during PCB layout.
Does SMBJ12H require pre-baking before reflow soldering?
No, SMBJ12H has a moisture sensitivity level (MSL) of 1 per J-STD-020, meaning it has unlimited floor life and does not require baking prior to surface-mount reflow. The device can be stored at ambient conditions and placed directly into standard lead-free reflow profiles (e.g., JEDEC J-STD-020D peak temp ≤260°C) without preconditioning-reducing manufacturing overhead and eliminating moisture-related popcorning risk.
How does SMBJ12H compare to SMBJ12A in terms of surge current handling?
SMBJ12H supports a maximum peak impulse current (IPP) of 28.0 A at its rated clamping voltage, whereas SMBJ12A handles 31.0 A. However, SMBJ12A achieves this at a lower clamping voltage (19.9 V vs. 22.0 V), indicating tighter VBR distribution and more aggressive turn-on. The SMBJ12H prioritizes robustness under extreme 600W surges, while SMBJ12A favors precision clamping in noise-sensitive applications.
Can SMBJ12H be used in place of SMAJ12A in existing designs?
No-SMBJ12H and SMAJ12A differ in package (DO-214AA vs. DO-214AC), thermal performance (RθJA = 55°C/W vs. 65°C/W), and surge rating (600W vs. 400W). Substituting SMBJ12H for SMAJ12A requires PCB pad revision due to larger SMB footprint (4.5mm length vs. 4.1mm), and may alter thermal decay dynamics. Always validate layout, thermal margin, and clamping behavior before interchange.
SMBJ12H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 22V
- Current - Peak Pulse (10/1000µs):
- 28A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ12H FAQ
1.How can I place an order for SMBJ12H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12H 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 SMBJ12H reliable?
The price and inventory of SMBJ12H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12H is usually 5 days.
3.What payment methods are accepted for SMBJ12H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12H?
SMBJ12H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12H 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 SMBJ12H?
For technical support, including SMBJ12H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12H requirements.
6.How does Aetrix verify that SMBJ12H is sourced from the original manufacturer or authorized distributors?
All SMBJ12H 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 SMBJ12H meets industry standards.
7.What is the process for return or replacement of SMBJ12H?
All SMBJ12H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12H, 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 SMBJ12H part is unused and in its original packaging.
Return procedure for SMBJ12H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12H Tags
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