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Taiwan Semiconductor Corporation SMBJ14C
- Part No.:
- SMBJ14C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ14C.pdf
- Description:
- 600W, 17.4V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,241
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Product details
Overview
SMBJ14C from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 14 V working stand-off voltage (VWM), 25.8 V maximum clamping voltage (VC) at 24.4 A peak pulse current, and 600 W peak pulse power rating with sub-1 ps response time - deployed in automotive body control modules to protect CAN transceivers from ISO 7637-2 Pulse 1/2a/3b transients.
For engineers reviewing the SMBJ14C datasheet, SMBJ14C pinout, SMBJ14C application, or SMBJ14C equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, leakage current at operating voltage, unidirectional polarity marking, and DO-214AA (SMB) thermal performance under sustained ambient temperatures up to +125°C.
Technical Context
The SMBJ14C uses a glass-passivated silicon junction optimized for fast avalanche breakdown under transient overvoltage conditions. Its unidirectional configuration provides low forward voltage drop (VF = 3.5 V @ 50 A) while maintaining <1 μA blocking leakage above 10 V, enabling compatibility with 12 V automotive systems where standby current budget is critical.
Thermal design relies on its DO-214AA package with 10 °C/W junction-to-case resistance and 55 °C/W junction-to-ambient resistance. It meets ISO 7637-2 immunity requirements for Pulse 1 (inductive load dump), Pulse 2a (battery disconnect), and Pulse 3b (capacitive coupling), validated per ANSI/IEEE C62.35 test waveforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous DC or RMS voltage the device blocks without conduction; sets upper limit for protected circuit's normal operating voltage. |
| VBR min/max | 15.6 V / 19.1 V @ 1 mA - Breakdown occurs within this range; ensures reliable triggering before downstream IC damage thresholds. |
| VC @ IPP | 25.8 V @ 24.4 A - Clamped voltage during 10/1000 µs surge; must stay below protected IC's absolute max rating (e.g., 30 V for many CAN transceivers). |
| PPK | 600 W - Peak pulse power handling capability with 10/1000 µs waveform; defines single-event surge energy absorption capacity. |
| ID @ VWM | <1 µA - Reverse leakage at 14 V; critical for low-power battery-backed circuits where quiescent current impacts battery life. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in engine bay environments with derated power above 25 °C ambient. |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with 0.090 g mass, UL 94V-0 molding, and matte tin-plated leads compliant with J-STD-002 solderability. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking; anode and cathode terminals aligned along body axis; lead pitch 2.3 mm, body size 4.5 × 3.9 × 2.3 mm; moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias | Connected to ground or lower-potential rail; enables low VF (3.5 V) conduction during positive surges on cathode side. |
| Cathode | Current exit point in forward bias; marked with band | Connected to protected line (e.g., CAN_H); clamps positive transients to ~25.8 V while blocking reverse leakage <1 µA at 14 V. |
Key Features
| Feature | Design Value |
|---|---|
| Sub-1 ps response time | Enables clamping before transient energy couples into sensitive analog or digital inputs - essential for protecting high-speed interfaces like CAN FD or LIN. |
| Glass-passivated junction | Ensures stable VBR and low leakage over temperature and lifetime; eliminates risk of passivation layer degradation under humidity or thermal cycling. |
| ISO 7637-2 compliance | Validated for Pulse 1 (−100 V/2 Ω), Pulse 2a (+100 V/50 Ω), and Pulse 3b (±300 V/50 Ω) - covers most automotive load-dump and inductive-switching threats. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - required for automotive OEM supply chain traceability and end-of-life recycling. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protects 12 V CAN_H line from load-dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS placed between CAN_H and chassis ground; clamps negative-going pulses to safe levels while blocking normal 12 V operation. Use Value: Limits VC to 25.8 V during 600 W surge, staying 4.2 V below typical CAN transceiver abs max rating (30 V), preventing latch-up or permanent damage. |
Use Scenario: Shields 24 V digital input channel from relay coil flyback and EFT bursts in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff device across input terminal and common rail; absorbs repetitive 10/1000 µs surges without degradation due to robust 600 W PPK rating. Use Value: Delivers <1 µA leakage at 24 V system voltage, avoiding false triggering of optocoupler-based input detection circuits during standby. |
| LED Driver Power Rail Protection | USB-C Port VBUS Transient Suppression |
Use Scenario: Guards constant-current LED driver IC supply against inductive switching spikes from nearby solenoid actuators. IC Role / Device Role / Timing Role: Mounted directly at driver IC VIN pin; responds in <1 ps to clamp 100 V/100 ns spikes before internal LDO or gate drivers are stressed. Use Value: Maintains 14 V VWM margin above 12 V nominal rail, allowing full system tolerance stack-up while delivering 24.4 A IPP handling for worst-case 600 W events. |
Use Scenario: Suppresses ESD and cable-induced surges on USB-C VBUS line in portable docking stations. IC Role / Device Role / Timing Role: Unidirectional TVS between VBUS and GND; leverages low capacitance (<100 pF at 0 V) to avoid signal integrity impact on 10 Gbps USB 3.2 Gen 2 signals. Use Value: Achieves 25.8 V clamping at 24.4 A, well below USB PD 3.0 20 V max, ensuring connected devices remain within safe operating area during hot-plug transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14A | Lower VBR range (15.6–17.2 V vs. 15.6–19.1 V); tighter tolerance improves predictability in precision clamping designs. | Better suited for 12 V systems requiring minimal clamping variation across temperature and lot-to-lot production. | Select SMBJ14A when VBR consistency is prioritized over maximum surge margin; same DO-214AA footprint and thermal specs. |
| SAC14 | Higher VC (27.0 V @ 24.4 A) and lower PPK (400 W); smaller SOD-123FL package with higher RθJA (125 °C/W). | Limited to lower-energy transients and space-constrained PCBs where thermal management is less critical. | Choose SAC14 only for cost-sensitive consumer applications with <400 W surge exposure; not recommended for automotive ISO 7637-2 compliance. |
Compared with SMBJ14C, SMBJ14A offers tighter VBR control for stable clamping in regulated 12 V domains, while SAC14 trades surge robustness and thermal performance for compact size - making SMBJ14C the optimal choice for demanding automotive and industrial environments requiring full 600 W/ISO 7637-2 coverage.
Availability
SMBJ14C is available at Aetrix Electronics and suitable for automotive electronics, industrial PLC I/O modules, LED lighting drivers, and USB-C power delivery systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ14C 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs since 1979.
The SMBJ series was developed specifically for automotive-grade transient suppression, emphasizing ISO 7637-2 compliance, low leakage, and robust thermal performance in DO-214AA packaging for under-hood and chassis-mounted electronics.
FAQ
What is the maximum clamping voltage of SMBJ14C under standard 10/1000 µs surge conditions?
The SMBJ14C has a maximum clamping voltage (VC) of 25.8 V when subjected to its rated peak pulse current of 24.4 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry remains below critical voltage thresholds during standardized surge events - a key parameter verified in SMBJ14C production testing.
Does SMBJ14C meet automotive transient immunity standards such as ISO 7637-2?
Yes, SMBJ14C meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a (battery disconnection), and Pulse 3b (capacitive coupling), as confirmed in Taiwan Semiconductor's official documentation. Its 600 W PPK rating and sub-1 ps response enable reliable suppression of these defined transients without degradation - a core design objective of the SMBJ14C specification.
What is the polarity configuration of SMBJ14C and how is it identified on the device?
SMBJ14C is a unidirectional TVS diode with cathode indicated by a distinct band on the DO-214AA (SMB) package body. The cathode connects to the protected line (e.g., CAN_H), while the anode ties to ground - enabling low forward voltage conduction (VF = 3.5 V @ 50 A) during positive transients. This polarity is fixed and non-reversible in SMBJ14C implementation.
How does SMBJ14C perform thermally in high-ambient environments like automotive engine compartments?
SMBJ14C supports operation up to +150 °C junction temperature with a junction-to-ambient thermal resistance (RθJA) of 55 °C/W. In a typical engine compartment at +125 °C ambient, its 600 W surge rating is derated per Figure 2 in the datasheet - retaining >300 W capability at that temperature. This thermal behavior is intrinsic to the SMBJ14C DO-214AA construction and validated across production lots.
Is SMBJ14C halogen-free and RoHS compliant?
Yes, SMBJ14C is both halogen-free per IEC 61249-2-21 and RoHS compliant per EU Directive 2011/65/EU. These environmental specifications are certified in Taiwan Semiconductor's material declarations and apply to all standard SMBJ14C production units - essential for automotive OEM qualification and global market access.
SMBJ14C 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 25.8V
- Current - Peak Pulse (10/1000µs):
- 24.4A
- 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)
SMBJ14C FAQ
1.How can I place an order for SMBJ14C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ14C 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 SMBJ14C reliable?
The price and inventory of SMBJ14C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ14C is usually 5 days.
3.What payment methods are accepted for SMBJ14C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ14C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ14C?
SMBJ14C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ14C 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 SMBJ14C?
For technical support, including SMBJ14C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ14C requirements.
6.How does Aetrix verify that SMBJ14C is sourced from the original manufacturer or authorized distributors?
All SMBJ14C 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 SMBJ14C meets industry standards.
7.What is the process for return or replacement of SMBJ14C?
All SMBJ14C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ14C, 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 SMBJ14C part is unused and in its original packaging.
Return procedure for SMBJ14C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ14C Tags
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