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Taiwan Semiconductor Corporation SMBJ14CH
- Part No.:
- SMBJ14CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ14CH.pdf
- Description:
- 600W, 17.4V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,139
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Product details
Overview
SMBJ14CH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 14 V working stand-off voltage (VWM), 15.6–19.1 V breakdown voltage (VBR), 24.4 A peak pulse current (IPP), 25.8 V maximum clamping voltage (VC), and 600 W peak pulse power (PPK) with <1.0 ps response time.
For engineers reviewing the SMBJ14CH datasheet, SMBJ14CH pinout, SMBJ14CH application, or SMBJ14CH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification status, unidirectional vs. bidirectional configuration, and thermal derating behavior above 25°C ambient.
Technical Context
The SMBJ14CH is a glass-passivated, single-die, bidirectional TVS diode optimized for fast transient suppression on DC power lines and signal paths subject to inductive switching, load dump, and EFT events. Its junction-to-case thermal resistance (RθJC) is 10°C/W, enabling effective heat dissipation during repetitive surges when mounted on thermally adequate PCB copper.
It meets ISO 7637-2 for automotive transients and complies with AEC-Q101 stress testing requirements including temperature cycling, humidity bias, and mechanical shock - confirming suitability for under-hood and body-control module applications where reliability under harsh environmental conditions is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous DC or RMS voltage the device blocks without significant leakage |
| VBR min/max | 15.6 / 19.1 V @ IT = 1 mA - Ensures reliable turn-on before system-level damage occurs |
| VC @ IPP | 25.8 V @ 24.4 A - Clamping voltage limits downstream IC stress during 10/1000 µs surge |
| PPK | 600 W - Peak power handling capability per single non-repetitive 10/1000 µs waveform |
| ID @ VWM | <1 µA - Low leakage preserves battery life and avoids false triggering in low-power systems |
| TJ max | +150°C - Enables operation in engine compartment and industrial control enclosures |
| Response time | <1.0 ps - Sub-nanosecond reaction ensures protection of high-speed logic and analog interfaces |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; polarity-sensitive for unidirectional variants, but SMBJ14CH is bidirectional - terminals are symmetrical and interchangeable. Matte tin-plated leads meet J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge path | Either terminal serves as anode or cathode depending on transient polarity - no orientation required during placement |
| Cathode band (absent) | Non-applicable | No polarity marking needed; device functions identically in both directions per datasheet specification |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including temperature cycling, HAST, and mechanical shock per AEC standard |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery interruption), and Pulse 3a/3b (EFT) waveforms |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives |
| Moisture sensitivity level 1 | Zero floor life limitation - can be stored indefinitely at ≤30°C/60% RH without baking prior to reflow |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally restricted substances |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs (e.g., body control modules, lighting controllers) from load dump and alternator transients. IC Role / Device Role / Timing Role: Primary clamping element placed between power rail and ground, absorbing energy before it reaches LDOs or microcontrollers. Use Value: Limits voltage excursion to ≤25.8 V during 24.4 A surge, preventing latch-up or gate oxide damage in downstream silicon rated for ≤30 V absolute maximum. | Use Scenario: Safeguarding RS-485 transceivers and analog sensor front-ends (e.g., pressure, temperature) connected to long cables in factory automation. IC Role / Device Role / Timing Role: Bidirectional shunt clamp across differential bus lines or supply-to-ground, suppressing EFT bursts and cable-coupled surges. Use Value: Sub-1 ps response ensures clamping begins before sensitive input stages experience overvoltage - critical for maintaining data integrity in 250 kbps+ communication links. |
| LED Driver Overvoltage Protection | DC Motor Control Board Protection |
Use Scenario: Shielding constant-current LED drivers in automotive headlamps or street lighting from reverse-battery and jump-start transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver IC supply pins, diverting surge current away from internal FETs and current-sense amplifiers. Use Value: 600 W PPK rating handles repeated 10/1000 µs pulses common in vehicle electrical systems without degradation - verified per AEC-Q101 lifetime testing. | Use Scenario: Protecting H-bridge gate drivers and current-sense resistors in brushed DC motor controllers used in HVAC actuators or power seats. IC Role / Device Role / Timing Role: Clamp placed across motor terminals or driver supply rails to absorb inductive kickback during PWM switching. Use Value: 25.8 V clamping voltage prevents gate-source overvoltage on 30 V-rated MOSFETs while allowing normal 12–24 V operation without leakage-induced heating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14CA | Same VWM (14 V), identical DO-214AA package, but manufactured by ON Semiconductor; VC = 25.8 V, IPP = 24.4 A - matches SMBJ14CH within ±0.2 V and ±0.1 A | Qualified to AEC-Q101 and ISO 7637-2, but lacks explicit mention of J-STD-020 MSL Level 1 in public datasheet | Select SMBJ14CA when dual-sourcing with ON Semi's quality system or when requiring alternate logistics channel |
| P6SMB14CA | Same electrical specs (VWM = 14 V, VC = 25.8 V, IPP = 24.4 A), DO-214AA package, manufactured by Vishay; RoHS/halogen-free compliant per Vishay spec | Also AEC-Q101 qualified and ISO 7637-2 certified, but thermal resistance RθJA = 50°C/W vs. 55°C/W for SMBJ14CH - marginally better ambient cooling | Choose P6SMB14CA for slightly improved thermal performance in convection-cooled layouts or where Vishay's extended product longevity program applies |
Compared with SMBJ14CH, SMBJ14CA offers identical clamping and surge ratings with equivalent automotive qualification, while P6SMB14CA provides marginally lower junction-to-ambient thermal resistance - both serve as functionally aligned alternatives where supply chain diversification or specific manufacturer preferences drive selection.
Availability
SMBJ14CH is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and LED driver overvoltage mitigation requiring stable component supply across multi-year production cycles.
Supply support for SMBJ14CH 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 semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive and industrial markets.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12 V/24 V automotive subsystems and ruggedized industrial controls - emphasizing robustness, low clamping voltage, and zero-maintenance reliability under thermal and mechanical stress.
FAQ
What is the polarity configuration of SMBJ14CH?
SMBJ14CH is a bidirectional TVS diode, meaning it protects against transients of either polarity without requiring orientation during PCB placement. Unlike unidirectional variants (e.g., SMBJ14H), it has no cathode band and functions identically in both directions - confirmed by its symmetric VBR min/max values (15.6–19.1 V) and explicit "CH" suffix designation in the SMBJH series ordering guide.
Does SMBJ14CH meet automotive qualification standards?
Yes, SMBJ14CH is explicitly AEC-Q101 qualified and tested per ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms. The datasheet confirms qualification across temperature cycling, humidity bias, and mechanical shock - making SMBJ14CH suitable for under-hood and body-control module applications where automotive-grade reliability is mandatory.
What is the maximum clamping voltage of SMBJ14CH at rated surge current?
The maximum clamping voltage (VC) of SMBJ14CH is 25.8 V when subjected to its rated peak pulse current (IPP) of 24.4 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components see no more than 25.8 V during worst-case surge events - critical for protecting 30 V-rated ICs in automotive power domains.
How does SMBJ14CH handle thermal derating at elevated ambient temperatures?
SMBJ14CH follows the standard pulse derating curve shown in Figure 2 of the datasheet: its 600 W peak pulse power rating linearly decreases above 25°C ambient, reaching ~450 W at +85°C and ~300 W at +125°C. This behavior is governed by its junction-to-ambient thermal resistance (RθJA = 55°C/W) and must be accounted for in high-temperature enclosure designs.
Is SMBJ14CH compatible with lead-free reflow soldering processes?
Yes, SMBJ14CH uses matte tin-plated leads compliant with J-STD-002 for solderability and is rated for standard lead-free reflow profiles (peak temperature up to 260°C). Its moisture sensitivity level is J-STD-020 Level 1 - meaning it can be stored indefinitely at ≤30°C/60% RH and placed directly into reflow without pre-baking.
SMBJ14CH 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):
- 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)
SMBJ14CH FAQ
1.How can I place an order for SMBJ14CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ14CH 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 SMBJ14CH reliable?
The price and inventory of SMBJ14CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ14CH is usually 5 days.
3.What payment methods are accepted for SMBJ14CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ14CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ14CH?
SMBJ14CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ14CH 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 SMBJ14CH?
For technical support, including SMBJ14CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ14CH requirements.
6.How does Aetrix verify that SMBJ14CH is sourced from the original manufacturer or authorized distributors?
All SMBJ14CH 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 SMBJ14CH meets industry standards.
7.What is the process for return or replacement of SMBJ14CH?
All SMBJ14CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ14CH, 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 SMBJ14CH part is unused and in its original packaging.
Return procedure for SMBJ14CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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