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Taiwan Semiconductor Corporation SMBJ14CA
- Part No.:
- SMBJ14CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ14CA.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:28,989
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Product details
Overview
SMBJ14CA from Taiwan Semiconductor is a bidirectional 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 clamps transients to ≤25.8V at 24.4A peak current. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b surges.
For engineers reviewing the SMBJ14CA datasheet, SMBJ14CA pinout, SMBJ14CA application, or SMBJ14CA equivalent, key selection criteria include bidirectional clamping capability, 1μA max leakage at 14V, 1.0ps response time, and compliance with J-STD-020 Level 1 moisture sensitivity - critical for high-reliability PCB assembly and ESD/inductive switching protection.
Technical Context
The SMBJ14CA is a single-die, glass-passivated junction TVS diode optimized for bidirectional transient suppression. Its breakdown voltage (VBR) is specified as 15.6–19.1V at 1mA test current, with clamping voltage (VC) ≤25.8V at 24.4A (10/1000µs waveform), ensuring robust overvoltage limiting across both polarities.
Thermal performance is defined by RθJC = 10°C/W and RθJA = 55°C/W, supporting operation from –55°C to +150°C junction temperature. It meets ISO 7637-2 immunity requirements and carries RoHS/halogen-free certifications per IEC 61249-2-21.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before conduction begins; defines safe standoff level for 12V nominal systems. |
| VBR (min/max) | 15.6 / 19.1 V @ 1 mA - Confirmed breakdown range ensures reliable triggering above VWM with margin against false clamping. |
| VC @ IPP | 25.8 V @ 24.4 A - Clamping voltage under 10/1000µs surge; limits downstream IC stress during automotive load dump or inductive kick events. |
| PPK | 600 W - Peak pulse power rating determines survivability of standardized transients like ISO 7637-2 Pulse 5a. |
| ID @ VWM | <1 µA - Ultra-low leakage preserves signal integrity and battery life in always-on circuits. |
| Response time | <1.0 ps - Sub-picosecond junction response enables effective suppression of fast EFT and ESD events. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads, UL 94V-0 molding compound, 0.090g weight, JESD 201 Class 2 whisker resistance, and polarity indicated by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry terminal in forward bias; common node in bidirectional configuration | Connected to protected line; symmetrical conduction allows identical clamping for positive/negative transients. |
| Cathode (banded end) | Current exit terminal in forward bias; reference node in bidirectional configuration | Typically tied to ground or low-impedance return path; band orientation confirms polarity during automated placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating DC lines without polarity concerns - e.g., CAN bus or sensor differential pairs. |
| Glass passivated junction | Ensures stable VBR and low leakage over temperature and lifetime, critical for automotive under-hood applications. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery interruption), and Pulse 3a/3b (switching noise), meeting OEM-level EMC requirements. |
| J-STD-020 Level 1 moisture sensitivity | Permits standard SMT reflow without baking, reducing manufacturing cost and cycle time for high-volume production. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load dump and alternator transients on 12V vehicle battery lines feeding ECUs and body control modules. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed between power rail and chassis ground. Use Value: Limits voltage to ≤25.8V during 600W surges, preventing damage to 3.3V/5V LDOs and microcontrollers downstream. | Use Scenario: Protecting analog front-end inputs of pressure or temperature sensors exposed to EFT in factory automation equipment. IC Role / Device Role / Timing Role: Fast-response shunt device absorbing 10/1000µs bursts before they reach precision ADC inputs. Use Value: Maintains signal fidelity with <1µA leakage at 14V and sub-1ps response, avoiding baseline drift or measurement error. |
| LED Driver Output Protection | RS-485 Transceiver Bus Line Protection |
Use Scenario: Safeguarding constant-current LED driver outputs against inductive switching spikes from relay or solenoid loads. IC Role / Device Role / Timing Role: Parallel-connected transient clamp on output terminals, referenced to system ground. Use Value: Clamps 24.4A surges to 25.8V, preventing latch-up or gate oxide failure in MOSFET drivers and LED strings. | Use Scenario: Shielding RS-485 transceiver A/B bus lines from ESD and lightning-induced surges in building control networks. IC Role / Device Role / Timing Role: Bidirectional TVS placed differentially across A–B and common-mode to ground. Use Value: Provides symmetrical ±25.8V clamping with no polarity dependency, preserving differential signaling integrity during 8kV contact ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14C | Same VWM (14V), identical VBR range (15.6–19.1V), but marked per older Taiwan Semiconductor revision; same DO-214AA package and electrical specs. | No functional difference; legacy marking code used interchangeably in BOMs where date-code or internal lot traceability differs. | Select SMBJ14C when sourcing from legacy inventory or distributor stock with prior revision documentation. |
| SAC14 | 14V VWM, 25.8V VC, but lower PPK = 400W and higher ID = 5µA @ VWM; same DO-214AA package. | Not suitable for ISO 7637-2 Pulse 5a (load dump); limited to lower-energy EFT and ESD events in non-automotive settings. | Choose SAC14 only for cost-sensitive consumer-grade designs where 600W surge immunity is not required. |
Compared with SMBJ14C and SAC14, the SMBJ14CA offers full 600W ISO 7637-2 compliance and <1µA leakage - making it the only option qualified for automotive power rail protection where sustained reliability under repeated surges is mandatory.
Availability
SMBJ14CA is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED lighting systems, and RS-485 communication buses requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ14CA 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, including TVS diodes, rectifiers, and MOSFETs, with ISO/TS 16949 certification.
The SMBJ series was designed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing ISO 7637-2 compliance, low leakage, and robust thermal performance in compact SMB packages.
FAQ
What does the 'CA' suffix indicate in SMBJ14CA?
The 'CA' suffix in SMBJ14CA denotes a bidirectional TVS diode configuration with symmetrical clamping characteristics for both positive and negative transients. Unlike unidirectional variants (e.g., SMBJ14A), the SMBJ14CA has no inherent anode/cathode polarity in circuit operation - enabling use on AC lines or differential buses without orientation constraints. This is confirmed in TSC's official documentation stating "C or CA suffix for types SMBJ5.0 – SMBJ170" for bipolar applications.
Does SMBJ14CA meet automotive EMC standards?
Yes, SMBJ14CA meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for electrical disturbances in road vehicles. Its 600W peak pulse power rating, 25.8V clamping voltage at 24.4A, and verified response time <1.0ps ensure compliance with OEM-level surge immunity tests. TSC explicitly lists ISO 7637-2 compliance in the FEATURES section of the SMBJ series datasheet (Version R2104).
What is the maximum clamping voltage of SMBJ14CA under surge conditions?
The maximum clamping voltage (VC) of SMBJ14CA is 25.8V at a peak impulse current (IPP) of 24.4A with a 10/1000µs waveform. This value is measured per ANSI/IEEE C62.35 and appears in the ELECTRICAL SPECIFICATIONS table for SMBJ14CA on page 2 of the TSC datasheet (R2104). It defines the upper voltage limit imposed on protected circuitry during standardized transient events.
Is SMBJ14CA compatible with lead-free reflow soldering processes?
Yes, SMBJ14CA supports lead-free reflow soldering. Its matte tin-plated leads comply with J-STD-002 solderability requirements, and its DO-214AA (SMB) package is rated for moisture sensitivity Level 1 per J-STD-020 - meaning it can be subjected to standard Pb-free reflow profiles (e.g., JEDEC J-STD-020D peak temp up to 260°C) without pre-baking. The UL 94V-0 molding compound also withstands these thermal cycles.
How does SMBJ14CA differ from SMBJ14A?
SMBJ14CA is bidirectional, while SMBJ14A is unidirectional. SMBJ14CA clamps transients equally in both directions with VBR = 15.6–19.1V and VC = 25.8V in either polarity; SMBJ14A conducts only in reverse bias and requires correct orientation. Additionally, SMBJ14A has a forward voltage (VF) of 3.5V at 50A, whereas SMBJ14CA has no defined VF due to its symmetric structure. These distinctions are documented in TSC's "Devices for Bipolar Applications" section.
SMBJ14CA 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:
- 2
- Voltage - Reverse Standoff (Typ):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 25.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ14CA FAQ
1.How can I place an order for SMBJ14CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ14CA 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 SMBJ14CA reliable?
The price and inventory of SMBJ14CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ14CA is usually 5 days.
3.What payment methods are accepted for SMBJ14CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ14CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ14CA?
SMBJ14CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ14CA 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 SMBJ14CA?
For technical support, including SMBJ14CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ14CA requirements.
6.How does Aetrix verify that SMBJ14CA is sourced from the original manufacturer or authorized distributors?
All SMBJ14CA 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 SMBJ14CA meets industry standards.
7.What is the process for return or replacement of SMBJ14CA?
All SMBJ14CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ14CA, 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 SMBJ14CA part is unused and in its original packaging.
Return procedure for SMBJ14CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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