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Taiwan Semiconductor Corporation SMBJ12CH
- Part No.:
- SMBJ12CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CH.pdf
- Description:
- 600W, 14.8V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,318
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Product details
Overview
SMBJ12CH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade ESD and surge protection in power rails and signal lines. It features a 12 V working stand-off voltage (VWM), 22.0 V maximum clamping voltage (VC) at 28.0 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time - deployed in CAN bus interfaces, automotive lighting control modules, and infotainment power supply inputs.
For engineers reviewing the SMBJ12CH datasheet, SMBJ12CH pinout, SMBJ12CH application, or SMBJ12CH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, low leakage (<1 µA at 12 V), and DO-214AA (SMB) package compatibility with automated SMT assembly.
Technical Context
The SMBJ12CH implements a glass-passivated silicon junction optimized for fast transient suppression in bidirectional configurations. Its breakdown voltage is specified at 13.3–16.3 V (min/max) with 1 mA test current, and it maintains stable clamping performance across -55°C to +150°C junction temperature range.
Thermal design is supported by RθJC = 10°C/W and RθJA = 55°C/W, enabling reliable operation under repetitive surge conditions when mounted on standard PCB copper areas. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC rail margin. |
| VBR (min/max) | 13.3 / 16.3 V @ 1 mA - Ensures consistent breakdown onset across production lots and temperature. |
| VC @ IPP | 22.0 V @ 28.0 A - Clamping voltage during 10/1000 µs surge; limits downstream IC stress to safe levels. |
| PPK | 600 W - Peak non-repetitive surge power handling per IEC 61000-4-5 and ISO 7637-2 standards. |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life and signal integrity in always-on automotive circuits. |
| TJ max | +150°C - Enables placement near heat sources (e.g., power converters) without derating concerns. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional configuration with cathode band omitted (symmetrical terminals). Matte tin-plated leads, RoHS and halogen-free compliant, UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Identical electrical behavior in both directions; no polarity marking required for SMBJ12CH. |
| Cathode band (absent) | Polarity indicator | Omitted due to bidirectional functionality - terminals are interchangeable in layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD HBM/MM. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) without degradation. |
| Fast response time | <1.0 ps - Limits voltage overshoot before protection activates, critical for high-speed data lines. |
| Low clamping ratio | VC/VBR ≈ 1.4–1.6 - Minimizes protected circuit overvoltage while maintaining robust surge margin. |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow - simplifies SMT line logistics. |
Applications
| Automotive CAN Bus Protection | LED Headlamp Driver Input Protection |
|---|---|
Use Scenario: Protects CAN_H/CAN_L differential pair against load dump and ESD events in vehicle body control modules. IC Role / Device Role / Timing Role: Bidirectional TVS clamps common-mode surges while preserving signal integrity up to 1 Mbps. Use Value: Prevents CAN transceiver latch-up or damage during 12 V system transients, ensuring network uptime per ISO 11898-2. |
Use Scenario: Shields buck converter input stage of adaptive LED headlamps from alternator-induced spikes. IC Role / Device Role / Timing Role: Absorbs 600 W pulses without failure, maintaining stable 12 V rail during engine cranking. Use Value: Eliminates need for redundant input filtering, reducing BOM count and PCB area in space-constrained lamp housings. |
| Infotainment Power Supply Clamp | Industrial Sensor Interface Protection |
Use Scenario: Guards 5 V/3.3 V power domains feeding touch controllers and audio codecs in center consoles. IC Role / Device Role / Timing Role: Fast-clamping TVS prevents brownout or reset during ignition-switching noise injection. Use Value: Maintains system responsiveness during repeated start-stop cycles, meeting OEM EMC immunity targets (CISPR 25 Class 4). |
Use Scenario: Safeguards RS-485 transceivers and analog front-ends in factory automation sensors exposed to motor drive noise. IC Role / Device Role / Timing Role: Bidirectional clamping handles both positive and negative transients on shared bus lines. Use Value: Extends field reliability beyond 10 years in harsh environments where surge repetition exceeds 10,000 cycles/year. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ12CA | Same DO-214AC (SMA) package; slightly higher VC (23.2 V @ 27.5 A); lower PPK (400 W). | Not AEC-Q101 qualified; limited to industrial/commercial use. | Select when cost sensitivity outweighs automotive qualification and 200 W lower surge margin is acceptable. |
| Vishay SMF12CA | DO-219AB (SOD-123FL) package; smaller footprint; VC = 22.5 V @ 26.7 A; PPK = 200 W. | Lower surge rating restricts use to low-energy ESD-only scenarios, not ISO 7637-2 Pulse 1. | Choose only for space-constrained consumer devices where full automotive surge immunity is not required. |
Compared with SMAJ12CA and SMF12CA, the SMBJ12CH delivers higher surge robustness (600 W vs. ≤400 W), automotive qualification, and proven ISO 7637-2 compliance - making it the preferred choice for safety-critical 12 V automotive subsystems requiring long-term field reliability.
Availability
SMBJ12CH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and LED lighting systems requiring stable component supply with guaranteed AEC-Q101 traceability and surge immunity certification.
Supply support for SMBJ12CH 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 for automotive and industrial markets.
The SMBJH series was developed specifically for AEC-Q101-compliant transient protection in 12 V/24 V automotive power networks, emphasizing robust clamping, low leakage, and process consistency across temperature and lifetime.
FAQ
What does the "CH" suffix indicate in SMBJ12CH?
The "CH" suffix denotes a bidirectional configuration in the SMBJH series. Unlike unidirectional variants (e.g., SMBJ12H), the SMBJ12CH provides symmetrical clamping for both polarities - essential for protecting AC-coupled or differential signal lines like CAN bus without polarity constraints. This is confirmed in the datasheet's "Devices for Bipolar Applications" section and reflected in identical VBR min/max values in both directions.
Is SMBJ12CH compatible with lead-free reflow soldering profiles?
Yes, SMBJ12CH supports standard lead-free reflow per J-STD-020. Its DO-214AA (SMB) package uses matte tin-plated leads rated for peak temperatures up to 260°C, and its moisture sensitivity level is rated at Level 1 - meaning no baking or floor-life restrictions apply before assembly. The device has been validated for JEDEC-standard reflow cycles including ramp-to-peak and time-above-liquidus parameters.
How does SMBJ12CH perform under repeated surge stress?
SMBJ12CH is rated for non-repetitive surges per IEC 61000-4-5 and ISO 7637-2, but its thermal resistance (RθJA = 55°C/W) and junction temperature limit (+150°C) allow limited repetitive operation if adequate PCB copper area is provided. Derating curves in Figure 2 of the datasheet show >80% PPK retention at 70°C ambient - confirming suitability for cyclic automotive loads such as headlamp switching or window motor actuation.
Can SMBJ12CH replace SMBJ12A in an existing design?
No - SMBJ12CH and SMBJ12AH are distinct parts. SMBJ12AH is unidirectional with tighter VBR tolerance (13.3–14.7 V), while SMBJ12CH is bidirectional with wider VBR (13.3–16.3 V). Substituting SMBJ12CH for SMBJ12AH would eliminate polarity-dependent forward conduction and alter clamping symmetry - potentially compromising protection in DC-biased circuits. Always verify directionality and VBR range before interchange.
Does SMBJ12CH meet ISO 16750-2 for automotive environmental stress?
SMBJ12CH is explicitly certified to ISO 7637-2 (Pulse 1/2a/2b/3a/3b), which covers conducted electrical transients in road vehicles. While ISO 16750-2 addresses broader environmental conditions (temperature, humidity, vibration), the AEC-Q101 qualification of SMBJ12CH - including HTOL, TCT, and mechanical shock testing - ensures compliance with the reliability requirements underlying ISO 16750-2 for electronic components used in automotive applications.
SMBJ12CH 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ12CH FAQ
1.How can I place an order for SMBJ12CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CH 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 SMBJ12CH reliable?
The price and inventory of SMBJ12CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12CH is usually 5 days.
3.What payment methods are accepted for SMBJ12CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CH?
SMBJ12CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CH 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 SMBJ12CH?
For technical support, including SMBJ12CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CH requirements.
6.How does Aetrix verify that SMBJ12CH is sourced from the original manufacturer or authorized distributors?
All SMBJ12CH 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 SMBJ12CH meets industry standards.
7.What is the process for return or replacement of SMBJ12CH?
All SMBJ12CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CH, 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 SMBJ12CH part is unused and in its original packaging.
Return procedure for SMBJ12CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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