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Taiwan Semiconductor Corporation SMBJ8.0CA
- Part No.:
- SMBJ8.0CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.0CA.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,603
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Product details
Overview
SMBJ8.0CA from Taiwan Semiconductor is a bidirectional 600W surface-mount 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 8.0V working stand-off voltage (VWM), 15.0V maximum clamping voltage (VC) at 42A peak pulse current (IPP), and sub-1ps response time to protect sensitive ICs from ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ8.0CA datasheet, SMBJ8.0CA pinout, SMBJ8.0CA application, or SMBJ8.0CA equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal resistance values (RθJA = 55°C/W), moisture sensitivity level (MSL 1), and RoHS/halogen-free compliance - all critical for automotive ECU, lighting control, and industrial I/O interface design.
Technical Context
The SMBJ8.0CA implements a glass-passivated silicon junction optimized for fast transient suppression with symmetrical breakdown in both polarities. Its bidirectional configuration enables single-device protection of AC-coupled or floating signal lines without polarity concerns, and its 150°C maximum junction temperature supports operation in under-hood automotive environments.
It meets ISO 7637-2 test pulses across all defined waveforms (Pulse 1, 2a, 2b, 3a, 3b), and its 10°C/W junction-to-case thermal resistance allows effective heat dissipation when mounted on thermally enhanced PCB copper areas - essential for sustained surge handling in 12V/24V vehicle systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system rail margin for reliable standby leakage control. |
| VBR (min/max) | 8.89 V / 10.9 V - Breakdown occurs within this range at 1 mA test current; defines threshold consistency for bidirectional overvoltage triggering. |
| VC @ IPP | 15.0 V at 42 A - Clamped voltage during 10/1000 µs surge; determines worst-case stress on downstream ICs during transient events. |
| PPK | 600 W - Peak pulse power rating per 10/1000 µs waveform; quantifies single-event energy absorption capability. |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; ensures negligible quiescent current draw in battery-powered systems. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; used to calculate temperature rise under steady-state power dissipation (e.g., 3 W PD → +165°C rise). |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; bidirectional symmetry means both terminals are functionally identical - no anode/cathode orientation required in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (marked side) | Transient return path (bidirectional) | Functions as cathode during positive transients and anode during negative transients - polarity-agnostic connection to protected line. |
| Cathode (unmarked side) | Transient return path (bidirectional) | Electrically identical to marked side; symmetric terminal assignment enables flexible PCB routing without directional constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or floating nodes without external polarity management circuitry. |
| Sub-1 ps response time | Ensures clamping activation before nanosecond-scale ESD events damage gate oxides in microcontrollers or communication transceivers. |
| ISO 7637-2 compliance | Validated performance against automotive load-dump and inductive-switching transients - eliminates need for additional qualification testing. |
| MSL 1 rating | Permits unlimited floor life and standard reflow soldering without baking, reducing manufacturing overhead in high-volume SMT lines. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 12V CAN/LIN bus interfaces and sensor inputs from load dump and alternator ripple in vehicle body electronics. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between input pin and ground to shunt transients exceeding 8.0V while maintaining signal integrity during normal operation. Use Value: Limits voltage seen by MCU I/O pins to ≤15.0V during 10/1000µs surges up to 42A, preventing latch-up or oxide breakdown per ISO 7637-2 Pulse 2b. | Use Scenario: Safeguarding 24V digital input channels on programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Standoff protection device connected across input terminals to absorb repetitive switching transients without degrading DC input threshold accuracy. Use Value: Maintains <1 µA leakage at 8.0V, ensuring stable logic-level detection while clamping 600W surges within 15.0V - preserving input comparator margins. |
| LED Driver Power Stage | RS-485 Transceiver Interface |
Use Scenario: Shielding buck/boost controller ICs and MOSFET gates from inductive kickback during LED string switching in automotive lighting. IC Role / Device Role / Timing Role: Parallel-connected TVS across power rail and ground to clamp voltage spikes generated by high-di/dt current transitions. Use Value: Withstands 100A peak forward surge (IFSM) and clamps to 15.0V, preventing gate oxide failure in 40V-rated driver FETs during PWM edge transitions. | Use Scenario: Providing robust ESD immunity on RS-485 data lines in factory automation equipment subject to cable discharge events. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed across differential pair (A/B) to equalize voltage excursion during ±8kV contact ESD per IEC 61000-4-2. Use Value: Sub-1ps response captures fast ESD edges before transceiver input structures fail; 15.0V clamping protects internal receiver comparators rated for ±12V common-mode range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.0A | Unidirectional version with same VWM (8.0V), VC (13.6V), and IPP (46A); lower clamping voltage but requires correct polarity placement. | Requires explicit anode/cathode routing; unsuitable for AC or floating nodes where polarity reversal may occur. | Select SMBJ8.0A only when protecting DC rails with known fixed polarity and tighter clamping is prioritized. |
| SMAJ8.0CA | Same bidirectional functionality but in smaller DO-214AC (SMA) package; lower PPK (400W), higher RθJA (70°C/W), and reduced IPP (28A). | Lower surge capacity limits use to low-energy applications like consumer USB ports or low-power sensors - not automotive-grade. | Choose SMAJ8.0CA only for space-constrained, non-automotive designs where 400W peak power suffices and thermal budget permits higher junction rise. |
Compared with SMBJ8.0A and SMAJ8.0CA, the SMBJ8.0CA uniquely balances 600W surge handling, bidirectional symmetry, MSL 1 manufacturability, and ISO 7637-2 validation - making it the preferred choice for automotive and industrial 12V/24V system-level protection where polarity uncertainty and high-energy transients coexist.
Availability
SMBJ8.0CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, LED driver power stages, and RS-485 communication interfaces requiring stable component supply across extended production lifecycles.
Supply support for SMBJ8.0CA 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 engineered specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing ISO 7637-2 compliance, MSL 1 robustness, and consistent clamping performance across temperature and lifetime.
FAQ
What does the "CA" suffix indicate in SMBJ8.0CA?
The "CA" suffix in SMBJ8.0CA denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression in both polarities. Unlike unidirectional variants (e.g., SMBJ8.0A), SMBJ8.0CA has no designated anode or cathode and functions identically regardless of voltage polarity applied across its terminals, enabling simplified layout for AC-coupled or floating circuits.
What is the maximum clamping voltage of SMBJ8.0CA and under what test condition?
The maximum clamping voltage (VC) of SMBJ8.0CA is 15.0 V, measured at a peak impulse current (IPP) of 42 A using the standardized 10/1000 µs double-exponential surge waveform. This value represents the worst-case voltage imposed on protected circuitry during a full-energy transient event and is guaranteed across the device's operating temperature range per the manufacturer's datasheet specifications.
Does SMBJ8.0CA meet automotive transient immunity standards?
Yes, SMBJ8.0CA meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (inductive switch-off), Pulse 3a (capacitive coupled noise), and Pulse 3b (battery connection bounce). This certification is explicitly stated in the product documentation and confirms suitability for direct integration into automotive electronic control units without additional external filtering.
What is the thermal resistance and how does it affect SMBJ8.0CA's surge handling?
SMBJ8.0CA has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and a junction-to-case value (RθJC) of 10°C/W. These values determine temperature rise during both transient and steady-state conditions: during a 600W surge, junction temperature spikes briefly, but the low RθJC enables rapid heat transfer to the PCB copper, while RθJA informs long-term derating above 25°C ambient per Figure 2 in the datasheet.
Is SMBJ8.0CA compatible with lead-free reflow soldering processes?
Yes, SMBJ8.0CA is fully compatible with lead-free reflow soldering. It carries a moisture sensitivity level (MSL) rating of Level 1 per J-STD-020, meaning it can be stored indefinitely at room temperature and subjected to standard JEDEC J-STD-020-compliant reflow profiles - including peak temperatures up to 260°C - without preconditioning or baking.
SMBJ8.0CA 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:
- 1
- Voltage - Reverse Standoff (Typ):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 46A
- 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)
SMBJ8.0CA FAQ
1.How can I place an order for SMBJ8.0CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.0CA 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 SMBJ8.0CA reliable?
The price and inventory of SMBJ8.0CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.0CA is usually 5 days.
3.What payment methods are accepted for SMBJ8.0CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.0CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.0CA?
SMBJ8.0CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.0CA 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 SMBJ8.0CA?
For technical support, including SMBJ8.0CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.0CA requirements.
6.How does Aetrix verify that SMBJ8.0CA is sourced from the original manufacturer or authorized distributors?
All SMBJ8.0CA 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 SMBJ8.0CA meets industry standards.
7.What is the process for return or replacement of SMBJ8.0CA?
All SMBJ8.0CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.0CA, 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 SMBJ8.0CA part is unused and in its original packaging.
Return procedure for SMBJ8.0CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.0CA Tags
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