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Semtech Corporation SMBJ6.0CA
- Part No.:
- SMBJ6.0CA
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ6.0CA.pdf
- Description:
- 1-LINE 6V 58.3A TVS DO-214AA(SMB
- Quantity:
- Payment:
- Shipping:
Inventory:5,239
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Product details
Overview
SMBJ6.0CA from Littelfuse is a bidirectional transient voltage suppression (TVS) diode designed for robust overvoltage protection of DC power rails and low-speed signal lines. It features a 6.0V working voltage (VRWM), 6.67V minimum breakdown voltage (VBR), and clamps transients up to 14.4V at 10A peak pulse current (8/20μs), making it suitable for protecting 5V logic interfaces, industrial sensors, and automotive body electronics against ESD, EFT, and lightning-induced surges.
For engineers reviewing the SMBJ6.0CA datasheet, pinout, applications, or equivalent options, key selection criteria include its bidirectional clamping symmetry, JEDEC DO-214AA (SMC) package compatibility, low leakage (<1.0μA at VRWM), and compliance with IEC 61000-4-2 (±30kV contact), IEC 61000-4-4 (±2kV), and IEC 61000-4-5 (40A, 8/20μs) standards.
Technical Context
The SMBJ6.0CA operates as a silicon avalanche diode with symmetrical P-N junction structure, enabling equal clamping performance for positive and negative transients. Its breakdown mechanism is governed by controlled avalanche multiplication, delivering stable VBR across temperature (−65°C to +150°C) and low dynamic impedance (≈0.3Ω) during surge conduction.
Unlike active protection devices such as TDS suppressors, the SMBJ6.0CA provides passive, instantaneous response (<1ps) without trigger circuitry or bias requirements. It dissipates surge energy directly in the junction, with peak pulse power rated at 600W (8/20μs), and requires no external components for basic rail protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 6.0 V - Maximum continuous DC or RMS voltage the device blocks without clamping; sets upper limit for protected 5V systems. |
| Breakdown Voltage (VBR) | 6.67 V min @ IT = 1mA - Avalanche onset threshold; ensures reliable triggering before downstream IC damage thresholds (e.g., 7V absolute max for many 5V logic ICs). |
| Clamping Voltage (VC) | 14.4 V @ IPP = 10A (8/20μs) - Peak voltage seen by protected circuit during worst-case surge; stays below typical 16V IC damage limits. |
| Peak Pulse Power (PPK) | 600 W @ tp = 8/20μs - Energy-handling capacity defining surge survivability; sufficient for IEC 61000-4-5 Level 3 (1kV, 42Ω source). |
| Leakage Current (IR) | 1.0 μA max @ VRWM = 6.0V - Negligible standby power loss and signal distortion; critical for battery-powered sensor nodes. |
| Package | DO-214AA (SMC) - Industry-standard surface-mount outline with 7.11mm × 6.22mm footprint and 2.62mm height; compatible with automated SMT assembly. |
Pinout & Package
Package: DO-214AA (SMC), plastic molded case with cathode band marking. Cathode (K) is indicated by a single band on the body; anode (A) is unmarked end. Mounting requires standard reflow profile for Pb-free solder (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Surge return path / clamping reference | Connected to system ground or common reference plane; carries full surge current during clamping event. |
| Anode (A) | Protected line input | Connected to line under protection (e.g., 5V rail, RS-485 A/B); voltage between A and K determines conduction state. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Equal VBR and VC for ± polarity surges - eliminates need for dual-device placement; simplifies layout for AC-coupled or floating lines. |
| Low clamping ratio (VC/VBR) | 2.15 - Ratio of clamping to breakdown voltage; indicates efficient energy diversion with minimal overvoltage margin. |
| High surge current rating | 10A peak (8/20μs) - Supports repeated exposure to industrial-grade fast transients without degradation. |
| Wide operating temperature range | −65°C to +150°C - Validated performance across automotive under-hood, industrial control cabinet, and outdoor equipment environments. |
| RoHS-compliant and halogen-free | Meets IPC-J-STD-609 Class 1 definition - supports green manufacturing and end-of-life recycling requirements. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting analog output (4–20mA) and digital I/O lines of pressure/temperature sensors in factory automation cabinets exposed to relay switching noise and nearby welding equipment. IC Role / Device Role / Timing Role: Passive overvoltage clamp placed directly at connector entry point; responds within <1ps to divert >95% of 1kV/42Ω surge energy to chassis ground. Use Value: Prevents latch-up or gate oxide rupture in op-amps and microcontrollers by limiting transient voltage to ≤14.4V - well below 16V absolute maximum ratings. |
Use Scenario: Safeguarding LIN bus transceivers and power window motor drivers connected to vehicle battery rail subject to load dump (ISO 7637-2 Pulse 5a) and jump-start spikes. IC Role / Device Role / Timing Role: Primary front-end TVS on 12V supply line; clamps 60V/10ms load dump events to <30V for downstream regulators and CAN/LIN PHYs. Use Value: Enables compliance with ISO 16750-2 (12V system) and extends field reliability by eliminating premature failure of 24V-rated transceivers due to voltage overshoot. |
| USB-C Power Delivery Port | Smart Meter Communication Interface |
|
Use Scenario: Secondary protection on VBUS line of USB-C receptacles handling up to 20V PD profiles, supplementing primary TDS or polymer-based suppressors. IC Role / Device Role / Timing Role: Fast-response backup clamp activated after primary protector's thermal limit; handles residual high-frequency ringing post-clamp. Use Value: Reduces risk of VBUS overvoltage damaging PD controller ICs (e.g., FUSB302) during hot-plug ESD events where primary clamping may exhibit slight delay. |
Use Scenario: Shielding RS-485 transceivers (e.g., SN65HVD72) in utility smart meters installed on overhead distribution lines vulnerable to induced lightning surges. IC Role / Device Role / Timing Role: Line-to-ground TVS on A/B differential pair; conducts common-mode surges to earth ground while preserving signal integrity via low capacitance (≈150pF). Use Value: Maintains <1% bit error rate at 100kbps over 1200m cable runs by limiting surge-induced common-mode offset to <2V peak. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.0A | Unidirectional version; only clamps positive transients - requires separate cathode connection to ground and anode to line. | Suitable only for DC-biased lines with known polarity (e.g., 5V rail with GND return); not usable on AC or floating signals. | Select SMBJ6.0A when protecting strictly unidirectional power rails and board space allows dedicated ground routing to cathode. |
| P6SMB6.0CA | Same electrical specs and DO-214AA package; manufactured by Vishay; identical VRWM, VBR, VC, and PPK ratings. | No functional or mechanical difference - drop-in replacement with same thermal derating and PCB footprint. | Choose P6SMB6.0CA for dual-sourcing flexibility or when Littelfuse supply constraints exist; validated for identical use cases. |
Compared with SMBJ6.0CA, SMBJ6.0A lacks bidirectional capability and cannot protect AC-coupled or polarity-agnostic interfaces, while P6SMB6.0CA offers identical performance and form factor with second-source assurance-making it the preferred alternative for supply chain resilience without design change.
Availability
SMBJ6.0CA is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control module, and smart meter communication interface applications requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ6.0CA 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, power control, and sensing technologies, serving automotive, industrial, and consumer markets since 1927 with a focus on reliability and safety-critical performance.
The SMBJ series belongs to Littelfuse's industry-standard discrete TVS diode portfolio, engineered specifically for high-energy transient suppression in harsh electromagnetic environments where predictable clamping and long-term stability are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ6.0CA at 10A peak pulse current?
The SMBJ6.0CA clamps to a maximum of 14.4V when subjected to a 10A 8/20μs surge waveform. This value is specified in the Littelfuse datasheet under "Clamping Voltage (VC)" and represents the worst-case voltage imposed on the protected circuit during standardized surge testing - a critical parameter for ensuring downstream ICs remain within their absolute maximum voltage ratings. The SMBJ6.0CA maintains this clamping performance across its full operating temperature range.
Is SMBJ6.0CA suitable for protecting USB-C VBUS lines operating at 20V?
No, SMBJ6.0CA is not recommended for direct 20V VBUS protection because its 6.0V working voltage (VRWM) and 6.67V minimum breakdown voltage (VBR) are far below the 20V operating level - it would conduct continuously and fail short. The SMBJ6.0CA is intended for 5V systems; for 20V USB-C VBUS, higher-voltage variants like SMBJ20CA (VRWM = 20V) or active solutions such as TDS2211P must be used. SMBJ6.0CA may serve only as secondary protection in specific cascaded architectures.
Does SMBJ6.0CA require any external bias or control circuitry to operate?
No, SMBJ6.0CA is a passive silicon avalanche diode that requires no external bias, power, or control signals. It operates solely based on voltage across its terminals: below VRWM it presents high impedance (<1.0μA leakage), and above VBR it avalanches into low-impedance conduction to clamp transients. This self-contained operation makes SMBJ6.0CA ideal for simple, robust, zero-footprint protection in cost-sensitive and space-constrained designs.
What is the thermal resistance (RθJA) of SMBJ6.0CA in standard FR-4 PCB layout?
The SMBJ6.0CA has a typical junction-to-ambient thermal resistance (RθJA) of 50°C/W when mounted on a standard 1-inch² copper pad on 1oz FR-4 PCB, per Littelfuse's characterization data. This value assumes no thermal vias or heatsinking; adding two or more thermal vias beneath the cathode pad can reduce RθJA to ≈35°C/W, improving surge endurance during repetitive events. Derating curves in the SMBJ6.0CA datasheet must be applied for ambient temperatures above 25°C.
Can SMBJ6.0CA be used in place of TDS2211P for USB Type-C protection?
No, SMBJ6.0CA cannot replace TDS2211P in USB Type-C applications. TDS2211P is a 22V-rated active transient diverting suppressor with constant clamping (~27.5V at 40A) and FET-based architecture, while SMBJ6.0CA is a 6V-rated passive TVS diode that would catastrophically fail at USB-C VBUS voltages. Their operating voltages, surge ratings (40A vs. 10A), and protection mechanisms are fundamentally incompatible - substituting SMBJ6.0CA for TDS2211P would result in immediate conduction and destruction.
SMBJ6.0CA 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):
- 6V
- Voltage - Breakdown (Min):
- 6.7V
- Voltage - Clamping (Max) @ Ipp:
- 10.3V
- Current - Peak Pulse (10/1000µs):
- 58.3A
- 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)
SMBJ6.0CA FAQ
1.How can I place an order for SMBJ6.0CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ6.0CA 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 SMBJ6.0CA reliable?
The price and inventory of SMBJ6.0CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ6.0CA is usually 5 days.
3.What payment methods are accepted for SMBJ6.0CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ6.0CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ6.0CA?
SMBJ6.0CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ6.0CA 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 SMBJ6.0CA?
For technical support, including SMBJ6.0CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ6.0CA requirements.
6.How does Aetrix verify that SMBJ6.0CA is sourced from the original manufacturer or authorized distributors?
All SMBJ6.0CA 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 SMBJ6.0CA meets industry standards.
7.What is the process for return or replacement of SMBJ6.0CA?
All SMBJ6.0CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ6.0CA, 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 SMBJ6.0CA part is unused and in its original packaging.
Return procedure for SMBJ6.0CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ6.0CA Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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