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Taiwan Semiconductor Corporation SMBJ14
- Part No.:
- SMBJ14
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ14.pdf
- Description:
- 600W, 17.4V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,097
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Product details
Overview
SMBJ14 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 power rails and signal lines. It features a 14 V working stand-off voltage (VWM), 15.6–19.1 V breakdown voltage (VBR) at 1 mA, 24.4 A peak pulse current (IPP), 25.8 V maximum clamping voltage (VC) at IPP, and 600 W peak pulse power rating with <1.0 ps response time - deployed in automotive lighting control modules and industrial I/O interfaces.
For engineers reviewing the SMBJ14 datasheet, SMBJ14 pinout, SMBJ14 application, or SMBJ14 equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, leakage current (<1 µA at 14 V), unidirectional polarity marking, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive transients.
Technical Context
The SMBJ14 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its breakdown threshold (15.6–19.1 V), diverting transient energy to ground while limiting downstream voltage to ≤25.8 V at 24.4 A. Its glass-passivated junction ensures stable VBR tolerance and low leakage.
Thermal performance is defined by RθJC = 10 °C/W and RθJA = 55 °C/W, enabling reliable operation up to TJ = 150 °C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1 mA | 15.6–19.1 V - Confirmed breakdown range ensuring robust turn-on margin above VWM |
| VC @ IPP=24.4 A | 25.8 V - Clamped voltage during 10/1000 µs surge, defining max stress on protected circuit |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs waveform per ISO 7637-2 |
| ID @ VWM | <1 µA - Low leakage preserves system standby power integrity |
| Response time | <1.0 ps - Enables suppression of nanosecond-scale ESD events (IEC 61000-4-2) |
| TJ max | +150 °C - Supports under-hood automotive and industrial ambient environments |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, UL 94V-0 molding compound, 0.090 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input / Line side | Connected to protected line (e.g., 12 V rail); conducts forward only during fault |
| Cathode | Output / Ground reference | Connected to system ground; defines polarity and clamping path during reverse surge |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime, critical for automotive-grade reliability |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking, reducing manufacturing cost and risk |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green electronics compliance |
Applications
| Automotive Lighting Control | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontroller GPIOs from load-dump transients in headlight/taillight modules. IC Role / Device Role: Unidirectional TVS placed between 12 V supply rail and ground, upstream of LDO input. Use Value: Limits clamped voltage to 25.8 V, staying below 30 V absolute max rating of typical automotive LDOs and MCU I/Os. | Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers against field-wiring ESD and inductive kickback. IC Role / Device Role: TVS connected across input terminal and common ground, shunting surges before optocoupler input stage. Use Value: 24.4 A IPP rating handles >1 kV/500 Ω IEC 61000-4-5 surge tests; low leakage avoids false triggering. |
| DC Power Supply Rail Protection | USB-C Port ESD Clamp |
Use Scenario: Secondary-side overvoltage clamp on 12–15 V DC-DC output rails feeding sensitive analog sensors or communication ICs. IC Role / Device Role: Standoff-rated TVS placed directly at power entry point to suppress board-level transients. Use Value: 14 V VWM aligns with nominal 12 V systems with 16.7 % tolerance; 25.8 V VC prevents latch-up in downstream 3.3 V/5 V regulators. | Use Scenario: Board-level ESD protection on USB-C VBUS line in portable medical devices requiring IEC 61000-4-2 Level 4 compliance. IC Role / Device Role: Unidirectional TVS on VBUS path, oriented to block reverse conduction while clamping positive surges. Use Value: Sub-1 ps response captures fast ESD events; 25.8 V clamping stays within USB-C VBUS 20 V max spec during 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 |
|---|---|---|---|
| SMBJ14A | Narrower VBR range (15.6–17.2 V vs. 15.6–19.1 V); lower clamping voltage (23.2 V vs. 25.8 V) | Better suited for tighter VDD margins where clamping headroom is constrained | Select SMBJ14A if downstream IC absolute max rating is ≤24 V; otherwise SMBJ14 provides wider VBR tolerance. |
| SMAJ14 | Lower PPK (400 W vs. 600 W); same VWM/VBR but higher VC (27.5 V) | Insufficient for ISO 7637-2 Pulse 1 (load dump) in 12 V systems requiring ≥600 W | Use SMAJ14 only in low-energy signal-line protection; SMBJ14 is required for power-rail surge immunity. |
Compared with SMBJ14A and SMAJ14, the SMBJ14 offers optimal balance of clamping voltage headroom, 600 W surge capacity, and broad VBR tolerance - making it preferred for 12 V automotive and industrial power rail protection where robustness and process variation margin are critical.
Availability
SMBJ14 is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC inputs, and DC power supply rail protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMBJ14 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 for automotive, industrial, and consumer markets.
The SMBJ series was developed specifically for high-reliability, surface-mount transient suppression in harsh environments - emphasizing ISO 7637-2 compliance, low leakage, and stable clamping performance across temperature and life cycle.
FAQ
What is the marking code for SMBJ14?
The marking code for SMBJ14 is LH, laser-etched on the cathode-banded surface of the DO-214AA (SMB) package. This code is used for visual identification during PCB assembly and inspection, and matches the device's electrical specifications including 14 V VWM and 15.6–19.1 V VBR range. The cathode band indicates the terminal connected to ground in unidirectional configuration.
Is SMBJ14 suitable for bidirectional transient protection?
No, SMBJ14 is a unidirectional TVS diode and not rated for bidirectional operation. For bipolar applications, Taiwan Semiconductor specifies SMBJ14C or SMBJ14CA variants - which feature symmetrical breakdown in both directions. Using SMBJ14 in reverse-biased mode beyond its specified VWM risks permanent damage due to lack of reverse conduction capability.
What is the maximum clamping voltage of SMBJ14 under surge conditions?
The maximum clamping voltage (VC) of SMBJ14 is 25.8 V at 24.4 A peak pulse current (IPP), measured with a 10/1000 µs waveform per IEC 61000-4-5 and ISO 7637-2. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events and must be verified against downstream IC absolute maximum ratings.
Does SMBJ14 meet automotive qualification standards?
Yes, SMBJ14 meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (supply disconnection and switching transients), and Pulse 3a/3b (capacitive coupling) requirements. It is also qualified to JESD201 Class 2 for whisker resistance and J-STD-020 MSL Level 1, supporting automotive under-hood and body-control module applications.
What is the thermal resistance from junction to ambient for SMBJ14?
The junction-to-ambient thermal resistance (RθJA) for SMBJ14 is 55 °C/W under standard JEDEC test conditions (on FR-4 board with 1 in² copper pad). This value enables thermal design validation for continuous power dissipation up to 3 W at 25 °C ambient, and derates linearly above that temperature per the published Pulse Derating Curve (Fig.2).
SMBJ14 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):
- 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)
SMBJ14 FAQ
1.How can I place an order for SMBJ14 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ14 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 SMBJ14 reliable?
The price and inventory of SMBJ14 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ14 is usually 5 days.
3.What payment methods are accepted for SMBJ14?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ14 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ14?
SMBJ14 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ14 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 SMBJ14?
For technical support, including SMBJ14 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ14 requirements.
6.How does Aetrix verify that SMBJ14 is sourced from the original manufacturer or authorized distributors?
All SMBJ14 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 SMBJ14 meets industry standards.
7.What is the process for return or replacement of SMBJ14?
All SMBJ14 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ14, 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 SMBJ14 part is unused and in its original packaging.
Return procedure for SMBJ14:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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