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Semtech Corporation SMBJ8.0CA
- Part No.:
- SMBJ8.0CA
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.0CA.pdf
- Description:
- 1-LINE 8V 44.1A TVS DO-214AA(SMB
- Quantity:
- Payment:
- Shipping:
Inventory:4,120
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Product details
Overview
SMBJ8.0CA from Littelfuse is a unidirectional transient voltage suppression (TVS) diode designed for primary-level overvoltage protection on DC power rails and I/O lines. It features a 8.0V working voltage (VRWM), 10.0V minimum breakdown voltage (VBR), 12.8V maximum clamping voltage at 22.5A (VC), 600W peak pulse power (PPK), and 22.5A peak pulse current (IPP) under 10/1000μs waveform - enabling robust surge immunity in industrial power supplies and automotive body electronics.
For engineers reviewing the SMBJ8.0CA datasheet, pinout, applications, or equivalent options, this device is selected for its precise clamping performance, low leakage (<1.0μA at VRWM), DO-214AA (SMB) package compatibility with high-current PCB layouts, and AEC-Q200 qualification for automotive-grade reliability.
Technical Context
The SMBJ8.0CA operates as a silicon avalanche diode with fast response time (<1.0ps) to transient events, leveraging controlled PN-junction avalanche breakdown to shunt surge energy to ground. Its unidirectional polarity supports DC-biased rail protection where reverse conduction is not required.
It complies with IEC 61000-4-2 (ESD ±30kV air/±30kV contact), IEC 61000-4-4 (EFT ±4kV), and IEC 61000-4-5 (surge ±1kV line-to-ground, 2Ω source impedance), delivering consistent clamping across -65°C to +150°C junction temperature range without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 8.0 V - Maximum continuous DC or RMS voltage the device blocks without significant leakage. |
| Breakdown Voltage (VBR) | 10.0 V min - Avalanche conduction initiates reliably above this threshold during transients. |
| Clamping Voltage (VC) | 12.8 V max at IPP = 22.5 A (10/1000 μs) - Limits protected circuit voltage to safe level during worst-case surge. |
| Peak Pulse Power (PPK) | 600 W - Sustains standardized 10/1000 μs surge energy without failure. |
| Leakage Current (IR) | <1.0 μA at 8.0 V - Minimizes standby power loss and avoids false triggering in low-power systems. |
| Package | DO-214AA (SMB) - Industry-standard surface-mount outline with 7.1 mm × 6.2 mm footprint and 2.3 mm height for high-current thermal dissipation. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-cathode configuration. Cathode marked by band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path / low-side connection | Connected to system ground or low-voltage reference to complete shunt path during clamping. |
| Cathode | Protected line input / high-side connection | Connected directly to line being protected (e.g., 12V rail, CAN_H); conducts when transient exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional TVS architecture | Enables DC-rail protection without reverse conduction risk; eliminates need for series blocking diodes in biased applications. |
| AEC-Q200 qualified | Validated for automotive environments including temperature cycling, vibration, and humidity exposure per Grade 2 (-40°C to +105°C). |
| Low dynamic impedance | Ensures stable clamping voltage across full IPP range - critical for protecting sensitive regulators and microcontrollers. |
| RoHS-compliant, halogen-free | Meets global environmental compliance requirements without compromising surge handling capability or thermal performance. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24V PLC Input Protection |
|---|---|
Use Scenario: Protecting LIN bus power supply and sensor inputs against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12V/24V distribution rail feeding MCU, transceivers, and analog front-ends. Use Value: Maintains <12.8V clamping during 22.5A surges, preventing latch-up or permanent damage to downstream 5V/3.3V LDOs and CAN/LIN transceivers. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Front-end transient suppressor on dry-contact or 24V sink-input terminals. Use Value: Withstands repeated 1kV/2Ω surges per IEC 61000-4-5 while maintaining sub-1μA leakage to avoid false triggering of optocoupled inputs. |
| DC-DC Converter Input Stage | USB-C Power Delivery (PD) Adapter Protection |
Use Scenario: Input rail protection for isolated flyback or buck converters receiving unregulated 12–48V input. IC Role / Device Role / Timing Role: First-line defense against conducted surges entering via AC/DC rectifier output or battery feed. Use Value: 600W PPK rating absorbs energy from long-tail transients without thermal runaway, preserving converter MOSFET gate drivers and controller ICs. |
Use Scenario: Secondary-side overvoltage clamp on 5–20V PD output rails before USB-C connector. IC Role / Device Role / Timing Role: Fast-response clamp limiting VBUS overshoot during hot-plug or adapter fault conditions. Use Value: 10.0V VBR and 12.8V VC ensure clamping remains below 13V - within USB PD 3.1 specification limits for 5V/9V/15V/20V profiles. |
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 | Identical electrical specs but unidirectional with cathode marking; same DO-214AA package and pinout. | No functional difference - SMBJ8.0CA and SMBJ8.0A are manufacturer-equivalent designations for same unidirectional device. | Select SMBJ8.0A if sourcing from distributors listing that part number; no layout or performance impact. |
| P6SMB8.0A | Same VRWM (8.0V), VBR (10.0V), VC (12.8V), but rated for 600W PPK with 10/1000μs waveform - identical surge capability. | Also DO-214AA packaged and AEC-Q200 qualified; differs only in branding and minor manufacturing traceability. | Valid drop-in alternative with full mechanical and electrical interchangeability; widely stocked in industrial distribution channels. |
Compared with SMBJ8.0CA, SMBJ8.0A is a direct nomenclature variant from the same manufacturer, while P6SMB8.0A offers identical protection performance in a functionally equivalent package - both enable seamless BOM substitution without redesign or requalification.
Availability
SMBJ8.0CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, DC-DC converter inputs, and USB-C PD adapter designs requiring stable component supply, long-term lifecycle support, and AEC-Q200-compliant surge protection.
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
Littelfuse is a global leader in circuit protection, designing and manufacturing fuses, TVS diodes, varistors, and gas discharge tubes since 1927.
The SMBJ series is part of Littelfuse's high-reliability discrete TVS portfolio, engineered specifically for demanding automotive, industrial, and telecom applications requiring repeatable clamping and extended temperature operation.
FAQ
What is the maximum clamping voltage of SMBJ8.0CA at rated peak pulse current?
The SMBJ8.0CA has a maximum clamping voltage (VC) of 12.8 V when subjected to a 10/1000 μs surge waveform at its rated peak pulse current of 22.5 A. This value is guaranteed per the Littelfuse datasheet and ensures downstream components remain within safe operating voltage limits during standardized surge events.
Is SMBJ8.0CA suitable for automotive applications?
Yes, SMBJ8.0CA is AEC-Q200 qualified for Grade 2 (-40°C to +105°C), making it suitable for under-hood and cabin automotive applications including body control modules, lighting drivers, and infotainment power supplies. Its robust surge rating and low leakage support reliable operation in harsh EMI and thermal environments.
What package type does SMBJ8.0CA use, and what are its key mechanical dimensions?
SMBJ8.0CA uses the DO-214AA (SMB) surface-mount package measuring 7.1 mm × 6.2 mm × 2.3 mm. Its standardized footprint enables high-current PCB routing, thermal relief via copper pour, and compatibility with automated pick-and-place assembly - critical for high-volume automotive and industrial production.
How does SMBJ8.0CA differ from bidirectional TVS diodes like SMBJ8.0C?
SMBJ8.0CA is unidirectional and protects only positive-going transients on DC-biased lines; SMBJ8.0C is bidirectional and handles both polarities, typically used on AC or floating signal lines. Using SMBJ8.0CA on a DC rail avoids unnecessary reverse conduction and provides tighter clamping control than its bidirectional counterpart.
Can SMBJ8.0CA be used in parallel to increase surge current handling?
No - SMBJ8.0CA is not recommended for parallel operation due to mismatched avalanche characteristics causing current imbalance and premature failure. For higher IPP, select a higher-rated device such as SMBJ12CA or use a multi-chip array like the SP1003 series with matched dynamic impedance.
SMBJ8.0CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJxxCA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8V
- Voltage - Breakdown (Min):
- 8.9V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 44.1A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°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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