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Taiwan Semiconductor Corporation SMBJ24CA
- Part No.:
- SMBJ24CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24CA.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:18,500
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Product details
Overview
SMBJ24CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 24V working stand-off voltage (VWM), and 38.9V maximum clamping voltage (VC) at 16.0A peak impulse current - designed to protect automotive power rails and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ24CA datasheet, SMBJ24CA pinout, SMBJ24CA application, or SMBJ24CA equivalent, key selection criteria include bidirectional clamping symmetry, sub-1ps response time, <1μA leakage above 10V, UL 94V-0 molding compound, and JESD201 Class 2 whisker resistance - all verified per Taiwan Semiconductor R2104 specification.
Technical Context
The SMBJ24CA implements a glass-passivated silicon junction optimized for fast transient suppression in bidirectional signal and power lines. Its breakdown voltage (VBR) is specified at 26.7–29.5V with 1mA test current, ensuring reliable turn-on before system-level damage occurs under ESD or load-dump events.
Thermal performance is defined by 10°C/W junction-to-case (RθJC) and 55°C/W junction-to-ambient (RθJA) resistance, supporting continuous operation up to +150°C junction temperature while maintaining clamping integrity across -55°C to +150°C storage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping initiates; sets safe margin below system rail voltage. |
| VBR (min/max) | 26.7 / 29.5 V @ 1 mA - Confirmed bidirectional breakdown threshold; ensures symmetric protection on both polarities. |
| VC @ IPP | 38.9 V @ 16.0 A - Clamped voltage during 10/1000µs surge; limits downstream IC stress to safe levels. |
| PPK | 600 W - Peak pulse power handling per ISO 7637-2; sustains high-energy transients without failure. |
| IR @ VWM | <1 µA - Ultra-low leakage at rated stand-off; avoids parasitic loading in high-impedance sensing circuits. |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with 0.090g mass; compatible with automated placement and reflow. |
Pinout & Package
DO-214AA (SMB) package with cathode band marking; two-terminal bidirectional device - no polarity-dependent pin assignment. Terminals are matte tin-plated leads, solderable per J-STD-002 and qualified for JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (marked band) | Bidirectional transient path | Identifies cathode end for unidirectional variants; for SMBJ24CA, both terminals function identically in either polarity. |
| Case | Non-electrical mechanical interface | UL 94V-0 compliant epoxy body; provides flame-retardant insulation and thermal conduction path to PCB copper. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Sub-1 ps response time | Clamps transients before propagation into sensitive analog or digital circuitry - critical for CAN, LIN, and sensor interfaces. |
| ISO 7637-2 compliance | Validated for automotive load-dump (Pulse 2b), inductive switching (Pulse 1), and EFT (Pulse 3a/3b) immunity testing. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS directives - supports green manufacturing and end-of-life compliance. |
Applications
| Automotive Power Rail Protection | Industrial I/O Interface Protection |
|---|---|
Use Scenario: 12V/24V battery-supplied ECUs exposed to load-dump pulses up to 120V and ISO 7637-2 Pulse 2b. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed at power entry point to shunt surge energy before DC-DC converters or microcontrollers. Use Value: Limits clamped voltage to ≤38.9V, preventing overvoltage damage to 3.3V/5V logic and analog front-ends. | Use Scenario: RS-485/RS-232 ports in PLCs and HMIs subjected to ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4). IC Role / Device Role / Timing Role: Primary-level transient suppressor on differential bus lines, paired with secondary filtering. Use Value: Sub-1ps response ensures clamping before ESD pulse edge propagates - preserving signal integrity and data validity. |
| LED Driver Output Protection | Automotive Sensor Signal Line Protection |
Use Scenario: Constant-current LED drivers driving high-brightness arrays in headlamps or signage, subject to inductive kickback. IC Role / Device Role / Timing Role: Parallel-connected TVS across output terminals to absorb reverse EMF from solenoid or inductor loads. Use Value: 600W PPK rating handles repetitive 8.3ms half-sine surges up to 100A IFSM without degradation. | Use Scenario: Analog sensor outputs (e.g., pressure, temperature) routed through engine bay harnesses vulnerable to coupled transients. IC Role / Device Role / Timing Role: Low-leakage (≤1µA) bidirectional clamp on signal line to ground, preserving millivolt-level accuracy. Use Value: 24V VWM allows full dynamic range utilization while clamping spikes >26.7V - no signal distortion during normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ24CA | Same DO-214AA package, identical VWM (24V), but higher VC = 39.4V @ 15.0A; slightly lower PPK = 400W. | Marginally reduced surge current handling; suitable where layout space or cost constraints favor Littelfuse sourcing. | Select SMAJ24CA only if existing design uses Littelfuse footprint and qualification history; verify clamping margin at system level. |
| ON Semiconductor SMCJ24CA | DO-214AB (SMC) package - larger footprint (7.11 × 6.22 mm vs. SMB's 4.57 × 3.94 mm); same VWM/VBR/VC specs but higher PPK = 1500W. | Requires PCB redesign; preferred for higher-energy transients where SMBJ24CA's 600W is marginal. | Choose SMCJ24CA when surge energy exceeds 600W capability or when thermal dissipation demands larger case size. |
Compared with SMAJ24CA, SMBJ24CA offers 50% higher peak power rating and tighter clamping voltage; versus SMCJ24CA, it delivers identical electrical protection in a 40% smaller footprint - ideal for space-constrained automotive modules and industrial sensors.
Availability
SMBJ24CA is available at Aetrix Electronics and suitable for automotive electronics, industrial I/O protection, and LED driver designs requiring stable component supply, consistent parametric performance, and full traceability across production batches.
Supply support for SMBJ24CA 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 power management devices.
The SMBJ series was developed specifically for robust, surface-mount transient suppression in automotive and industrial environments - emphasizing ISO 7637-2 compliance, low leakage, and high-reliability packaging.
FAQ
What is the clamping voltage of SMBJ24CA at its rated peak impulse current?
The SMBJ24CA has a maximum clamping voltage (VC) of 38.9 V when subjected to a 10/1000 µs surge waveform at 16.0 A peak impulse current (IPP), as specified in Taiwan Semiconductor's R2104 datasheet. This value ensures downstream components see limited overvoltage during standardized transients like ISO 7637-2 Pulse 1 and Pulse 2b. The SMBJ24CA maintains this clamping performance across its full operating temperature range.
Is SMBJ24CA unidirectional or bidirectional, and how is polarity identified?
SMBJ24CA is a bidirectional TVS diode - it provides symmetrical clamping for both positive and negative transients without polarity sensitivity. Unlike unidirectional variants (e.g., SMBJ24A), the "CA" suffix explicitly denotes bidirectional functionality. The cathode band marking on the DO-214AA package is retained for manufacturing consistency but does not define functional polarity in SMBJ24CA.
Does SMBJ24CA meet automotive-grade reliability standards?
Yes, SMBJ24CA meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, and is qualified per JESD201 Class 2 for whisker resistance. Its DO-214AA package uses UL 94V-0 molding compound, and the device operates from –55°C to +150°C junction temperature - satisfying AEC-Q101 stress-test prerequisites for automotive use, though formal AEC-Q101 certification must be confirmed per batch documentation.
What is the maximum leakage current of SMBJ24CA at its working stand-off voltage?
At its 24 V working stand-off voltage (VWM), the SMBJ24CA exhibits a maximum blocking leakage current (ID) of 1 µA at 25°C, per Taiwan Semiconductor R2104 specifications. This ultra-low leakage prevents unwanted loading of high-impedance circuits such as sensor bias networks or precision reference paths - a critical requirement in automotive and industrial analog signal chains.
Can SMBJ24CA replace SMBJ24A in an existing design?
No - SMBJ24CA and SMBJ24A are not interchangeable without validation. SMBJ24A is unidirectional (anode-cathode asymmetric), while SMBJ24CA is bidirectional (symmetric clamping). Substituting SMBJ24CA for SMBJ24A may cause unintended conduction in DC-biased circuits. Always verify circuit topology, bias conditions, and clamping directionality before replacement; SMBJ24CA is intended only for AC-coupled or floating signal/power lines.
SMBJ24CA 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 15.5A
- 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)
SMBJ24CA FAQ
1.How can I place an order for SMBJ24CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24CA 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 SMBJ24CA reliable?
The price and inventory of SMBJ24CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24CA is usually 5 days.
3.What payment methods are accepted for SMBJ24CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24CA?
SMBJ24CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24CA 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 SMBJ24CA?
For technical support, including SMBJ24CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24CA requirements.
6.How does Aetrix verify that SMBJ24CA is sourced from the original manufacturer or authorized distributors?
All SMBJ24CA 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 SMBJ24CA meets industry standards.
7.What is the process for return or replacement of SMBJ24CA?
All SMBJ24CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24CA, 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 SMBJ24CA part is unused and in its original packaging.
Return procedure for SMBJ24CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ24CA Tags
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