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Taiwan Semiconductor Corporation SMBJ14H
- Part No.:
- SMBJ14H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ14H.pdf
- Description:
- 600W, 17.4V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,208
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Product details
Overview
SMBJ14H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 14V working stand-off voltage (VWM), and 25.8V maximum clamping voltage (VC) at 24.4A peak impulse current - designed to protect automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ14H datasheet, SMBJ14H pinout, SMBJ14H application, or SMBJ14H equivalent, key selection criteria include clamping performance under 10/1000µs surge, unidirectional polarity marking, AEC-Q101 qualification, and compatibility with automated SMT placement on 12–24V DC systems requiring robust ESD and load-dump immunity.
Technical Context
The SMBJ14H operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its 15.6–19.1V breakdown range (VBR @ IT = 1mA). Its glass-passivated junction ensures stable leakage (<1µA at 14V) and fast response (<1.0ps), enabling effective suppression of fast-rising transients such as EFT and inductive switching spikes.
Thermally, it features RθJC = 10°C/W and RθJA = 55°C/W, supporting continuous operation up to TJ = 150°C. It is not rated for bidirectional use unless specified with CH or CAH suffix - SMBJ14H is strictly unidirectional with cathode band marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before clamping begins; sets system rail compatibility for 12V nominal circuits. |
| VBR min/max | 15.6 / 19.1 V @ 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on above normal operating voltage with margin. |
| VC @ IPP | 25.8 V @ 24.4 A - Clamped voltage during 10/1000µs surge; limits downstream IC stress to safe levels in automotive load-dump events. |
| PPK | 600 W - Peak pulse power rating per 10/1000µs waveform; defines transient energy absorption capability. |
| ID @ VWM | <1 µA - Reverse leakage at stand-off voltage; minimizes quiescent power loss in battery-powered systems. |
| Package | DO-214AA (SMB) - Standard surface-mount outline with matte tin-plated leads; compatible with IPC-7351B footprint and J-STD-002 solderability. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case meeting UL 94V-0, cathode indicated by band-marked end; terminals are matte tin-plated for lead-free reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; conducts during forward surge (e.g., reverse battery protection). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V rail); avalanches into conduction when transient exceeds VBR, shunting current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood applications per stress test requirements including temperature cycling, HTRB, and ESD. |
| Glass passivated junction | Ensures stable VBR and low IR drift over lifetime and thermal cycling; improves long-term reliability vs. epoxy-passivated alternatives. |
| Clamping ratio VC/VBR | ~1.45 (25.8V / 17.7V typ) - Low ratio indicates efficient voltage limiting without excessive overshoot during fast transients. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) - enables single-device compliance in automotive ECUs. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller GPIOs from load-dump and jump-start transients in 12V vehicle subsystems. IC Role / Device Role: Unidirectional TVS placed between LIN line and chassis ground to clamp negative-going spikes and positive surges up to 600W. Use Value: Limits voltage seen by MAX13051 or TLE6250 transceivers to ≤25.8V, preventing latch-up and ensuring ASIL-B functional safety compliance. | Use Scenario: Safeguarding 24V digital input channels on programmable logic controllers exposed to relay coil flyback and EFT noise. IC Role / Device Role: Standoff protection device mounted at connector entry point, shunting transients before signal conditioning circuitry. Use Value: Maintains <1µA leakage at 24V nominal, avoiding false triggering while clamping 1kV/500A surges per IEC 61000-4-4 Level 4. |
| LED Headlamp Driver Power Input | DC Motor Controller Power Stage |
Use Scenario: Shielding buck converter inputs in automotive LED headlamps from battery line disturbances during cold-crank and alternator load dump. IC Role / Device Role: Primary overvoltage clamp on 12V input rail upstream of MPQ4312 or LM5164 controller ICs. Use Value: Withstands 10/1000µs pulses up to 600W and clamps to 25.8V, keeping input voltage within VIN max spec of switching regulators. | Use Scenario: Protecting half-bridge gate drivers (e.g., DRV8305) and current-sense amplifiers from inductive kickback during brushed DC motor commutation. IC Role / Device Role: Unidirectional TVS across motor supply rail and ground, triggered only during positive overvoltage events. Use Value: Fast <1ps response captures sub-microsecond flyback edges; 24.4A IPP rating handles typical 30–50A motor stall 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 | Narrower VBR range (15.6–17.2V) and lower VC (23.2V @ 27A); tighter tolerance but reduced surge margin. | Better for precision-clamp designs where lower clamping voltage is prioritized over peak current handling. | Select SMBJ14A if system requires <23.5V clamping ceiling and operates below 25A surge conditions. |
| SMCJ14H | Larger DO-214AB (SMC) package; same VWM/VBR/VC specs but higher PPK (1500W) and IPP (69.4A). | Suitable for higher-energy transients (e.g., ISO 7637-2 Pulse 5a) where PCB space allows larger footprint. | Choose SMCJ14H when 600W is insufficient and layout permits SMC package; not drop-in due to different pad dimensions. |
Compared with SMBJ14A and SMCJ14H, the SMBJ14H delivers balanced clamping performance (25.8V), certified AEC-Q101 reliability, and compact SMB footprint - making it optimal for space-constrained 12V automotive modules needing validated 600W surge immunity without over-engineering.
Availability
SMBJ14H is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O protection, and LED lighting power input stages requiring stable component supply, AEC-Q101 qualification, and ISO 7637-2 compliance.
Supply support for SMBJ14H 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 automotive-grade protection devices.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in automotive power networks and industrial control systems - emphasizing low clamping ratio, high surge robustness, and SMT manufacturability.
FAQ
What is the breakdown voltage range for SMBJ14H?
The SMBJ14H has a minimum breakdown voltage (VBR) of 15.6 V and a maximum of 19.1 V, measured at 1 mA test current per ANSI/IEEE C62.35. This range ensures reliable triggering above its 14 V working stand-off voltage while accommodating process variation - critical for consistent clamping behavior across production lots of SMBJ14H.
Is SMBJ14H suitable for bidirectional transient protection?
No, SMBJ14H is a unidirectional TVS diode and must be used with correct polarity - cathode connected to the protected line. For bidirectional protection, select SMBJ14CH or SMBJ14CAH variants. The SMBJ14H datasheet explicitly states electrical characteristics apply only in reverse direction; forward conduction is limited to VF ≈ 3.5 V at 50 A, not intended for symmetrical clamping.
Does SMBJ14H meet automotive qualification standards?
Yes, SMBJ14H is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. Its construction - glass-passivated junction, moisture sensitivity level 1, and JESD201 Class 2 whisker resistance - supports under-hood deployment in automotive ECUs, body control modules, and lighting systems where SMBJ14H is deployed.
What is the maximum clamping voltage of SMBJ14H under surge conditions?
The SMBJ14H clamps to a maximum of 25.8 V when subjected to its rated 10/1000 µs surge waveform at 24.4 A peak current (IPP). This VC value is guaranteed across temperature and lot variations, enabling accurate worst-case overvoltage analysis for downstream components like MCUs, transceivers, and power ICs protected by SMBJ14H.
Can SMBJ14H be used in DC motor driver applications?
Yes, SMBJ14H is commonly used across DC motor driver power rails to suppress inductive flyback transients. Its 600W peak pulse rating, 24.4A IPP, and 25.8V clamping voltage protect gate drivers and current-sense circuits from voltage spikes generated during PWM commutation - provided the motor supply is ≤14V nominal and polarity is correctly observed for SMBJ14H installation.
SMBJ14H 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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ14H FAQ
1.How can I place an order for SMBJ14H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ14H 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 SMBJ14H reliable?
The price and inventory of SMBJ14H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ14H is usually 5 days.
3.What payment methods are accepted for SMBJ14H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ14H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ14H?
SMBJ14H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ14H 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 SMBJ14H?
For technical support, including SMBJ14H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ14H requirements.
6.How does Aetrix verify that SMBJ14H is sourced from the original manufacturer or authorized distributors?
All SMBJ14H 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 SMBJ14H meets industry standards.
7.What is the process for return or replacement of SMBJ14H?
All SMBJ14H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ14H, 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 SMBJ14H part is unused and in its original packaging.
Return procedure for SMBJ14H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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