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Semtech Corporation SMBJ11CA
- Part No.:
- SMBJ11CA
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ11CA.pdf
- Description:
- 1-LINE 11V 33.0A TVS DO-214AA(SM
- Quantity:
- Payment:
- Shipping:
Inventory:6,793
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Product details
Overview
SMBJ11CA from Littelfuse is a unidirectional transient voltage suppression diode designed for primary-level overvoltage protection on DC power rails and I/O lines. It features a 11 V working voltage (VRWM), 18.2 V minimum breakdown voltage (VBR), 19.9 V maximum clamping voltage at 32.7 A (VC), 600 W peak pulse power (PPK), and operates across –65 °C to +150 °C. It protects industrial power supplies, automotive ECUs, and PoE-powered devices against lightning-induced surges per IEC 61000-4-5.
For engineers reviewing the SMBJ11CA datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under 8/20 µs transients, junction temperature derating behavior, unidirectional polarity suitability for grounded-rail systems, and compatibility with automated SMT placement in DO-214AA (SMB) packages.
Technical Context
The SMBJ11CA employs a planar passivated silicon avalanche junction structure optimized for fast response (<1 ps) to transient overvoltages and low dynamic impedance (ZD ≈ 0.61 Ω). Its unidirectional configuration allows direct anode-to-ground connection on positive-rail systems, eliminating need for series blocking components in DC-biased applications.
It meets IEC 61000-4-2 ESD immunity (±30 kV air, ±30 kV contact), IEC 61000-4-4 EFT (±2 kV), and IEC 61000-4-5 surge (4 kV line-earth, 2 kV line-line) standards when used with appropriate PCB layout-short trace lengths, low-inductance ground paths, and proximity to protected connectors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 11 V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| Breakdown Voltage (VBR) | 18.2–20.1 V at 1 mA - Voltage at which avalanche conduction begins; defines minimum protection threshold. |
| Clamping Voltage (VC) | 19.9 V at 32.7 A (8/20 µs) - Maximum voltage seen by protected circuit during rated surge; ensures downstream ICs remain below absolute max ratings. |
| Peak Pulse Power (PPK) | 600 W - Surge energy handling capability at 25 °C; derates linearly to ~360 W at 125 °C ambient. |
| Junction Temperature Range | –65 °C to +150 °C - Enables use in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
| Package | DO-214AA (SMB) - Standardized 4.57 mm × 3.94 mm surface-mount outline compatible with JEDEC MS-013AC footprint. |
Pinout & Package
Package: DO-214AA (SMB), plastic molded, cathode-banded end, RoHS-compliant, halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink | Connected to protected line; conducts transient current to ground when voltage exceeds VBR. |
| Anode | Reference node | Typically tied to system ground or lowest potential rail; completes conduction path during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping ratio (VC/VBR ≈ 1.10) | Minimizes overvoltage stress on downstream MOSFETs, regulators, and microcontrollers during surge events. |
| Fast response time (<1 ps) | Activates before sensitive logic or analog circuits experience damaging overvoltage-critical for high-speed data lines and switching converters. |
| High surge current rating (32.7 A, 8/20 µs) | Withstands multiple IEC 61000-4-5 Level 3 surges (1 kV/42 Ω) without degradation or parametric shift. |
| Low leakage current (<1 µA at VRWM) | Prevents measurable power loss in battery-powered or ultra-low-quiescent-current systems. |
| Automotive-grade temperature range | Validated operation from –65 °C to +150 °C supports engine control units, ADAS sensors, and EV charging interfaces. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and inductive switching transients. IC Role / Device Role: Primary overvoltage clamp placed between input terminal and bulk capacitor. Use Value: Limits transient voltage to ≤19.9 V, preventing damage to upstream rectifier bridge and downstream buck controller ICs rated for 20 V max input. |
Use Scenario: LIN bus transceiver power rail in door module subjected to ISO 7637-2 Pulse 1 (inductive spike) and Pulse 5a (load dump). IC Role / Device Role: Unidirectional TVS connected anode-to-ground on 12 V supply line feeding LIN transceiver. Use Value: Clamps 100 V/100 ms load dump to <20 V within 1 ps, preserving transceiver functionality without requiring external series resistor or Zener regulator. |
| Power over Ethernet (PoE) PSE Detection | Smart Meter AC/DC Auxiliary Supply |
Use Scenario: 48 V DC detection circuitry in IEEE 802.3af/at PSE controller where false triggering must be avoided during normal operation. IC Role / Device Role: Overvoltage guard on sense resistor network monitoring signature resistance and classification voltage. Use Value: Blocks >19.9 V transients while maintaining <1 µA leakage at 48 V nominal-ensuring accurate 25 kΩ signature measurement and preventing false Class 0–4 misclassification. |
Use Scenario: Input stage of auxiliary 5 V supply derived from 230 VAC mains via capacitive dropper in utility smart meter. IC Role / Device Role: Secondary surge suppressor after MOV, placed across rectified DC link before linear regulator. Use Value: Absorbs residual 1 kV/0.5 µF surges that bypass primary MOV, limiting voltage to <20 V and protecting low-dropout regulator's 6 V absolute max rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ11A | Unidirectional, identical VRWM (11 V), VBR (18.2–20.1 V), VC (19.9 V), and package; same electrical specs. | No functional difference; SMBJ11A is standard industry designation; SMBJ11CA denotes Littelfuse's specific manufacturing lot traceability and screening. | Select SMBJ11A for general-purpose designs; choose SMBJ11CA when Littelfuse-specific qualification, extended temperature validation, or full traceability is required. |
| P6SMB11A | Same DO-214AA package and 11 V VRWM, but lower PPK (600 W vs. 600 W), higher VC (21.2 V at 28.3 A), and wider VBR tolerance (18.2–22.0 V). | Higher clamping voltage reduces margin for 20 V-rated ICs; less suitable for tight-voltage-margin applications like PoE detection or automotive LIN. | Use P6SMB11A only where clamping voltage margin ≥21.2 V is acceptable and cost sensitivity outweighs precision clamping requirements. |
Compared with SMBJ11A and P6SMB11A, SMBJ11CA delivers identical clamping performance to SMBJ11A with full Littelfuse process control, while offering tighter VBR consistency and lower VC than P6SMB11A-making it optimal for automotive and industrial designs demanding repeatable surge protection behavior across temperature and lifetime.
Availability
SMBJ11CA is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and Power over Ethernet infrastructure requiring stable component supply, long-term lifecycle support, and consistent surge performance across production batches.
Supply support for SMBJ11CA 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 manufacturer of circuit protection, power control, and sensing technologies, founded in 1927 and headquartered in Chicago, Illinois.
The SMBJ series belongs to Littelfuse's discrete TVS diode portfolio, engineered specifically for robust, standardized surge suppression in harsh environments-including automotive, industrial automation, and telecommunications infrastructure.
FAQ
What is the maximum clamping voltage of SMBJ11CA under IEC 61000-4-5 surge conditions?
The SMBJ11CA exhibits a maximum clamping voltage of 19.9 V at 32.7 A using the 8/20 µs current waveform per IEC 61000-4-5. This value is measured with 2 Ω source impedance and represents the peak voltage imposed on the protected circuit during worst-case surge events. The SMBJ11CA maintains this clamping performance across its full operating temperature range from –65 °C to +150 °C.
Can SMBJ11CA be used in bidirectional signal line protection?
No, SMBJ11CA is a unidirectional TVS diode and is not suitable for bidirectional signal lines such as RS-485, CAN, or USB D+/D– without additional circuitry. Its anode must be connected to ground or the lowest reference potential, and it only clamps positive transients on the cathode side. For bidirectional protection, a dedicated bidirectional part like SMBJ11CA's counterpart SMBJ11C or SMAJ11C is required.
How does SMBJ11CA compare to standard Zener diodes for surge protection?
Unlike standard Zener diodes, SMBJ11CA is optimized for high-energy transient suppression-not regulation. It offers faster response (<1 ps vs. >1 ns), higher peak pulse power (600 W vs. typically <5 W), lower dynamic impedance (~0.61 Ω), and guaranteed clamping performance per IEC standards. Standard Zeners lack surge-rated construction and degrade rapidly under repeated 8/20 µs transients, whereas SMBJ11CA is qualified for thousands of such events.
Is SMBJ11CA compatible with lead-free reflow soldering profiles?
Yes, SMBJ11CA is fully compatible with standard lead-free reflow soldering processes, including JEDEC J-STD-020D-compliant peak temperatures up to 260 °C for 30 seconds. Its DO-214AA package uses matte tin-plated leads and halogen-free molding compound, meeting RoHS Directive 2011/65/EU and IPC/JEDEC J-STD-020 requirements without delamination or parameter shift.
What is the leakage current specification for SMBJ11CA at its rated working voltage?
At its rated reverse stand-off voltage (VRWM) of 11 V and ambient temperature of 25 °C, SMBJ11CA guarantees a maximum reverse leakage current (IR) of 1 µA. This low leakage ensures minimal power loss in always-on systems and avoids interference with high-impedance sensing circuits-critical in battery-backed smart meters and automotive wake-up monitoring networks.
SMBJ11CA 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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 33A
- 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)
SMBJ11CA FAQ
1.How can I place an order for SMBJ11CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ11CA 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 SMBJ11CA reliable?
The price and inventory of SMBJ11CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ11CA is usually 5 days.
3.What payment methods are accepted for SMBJ11CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ11CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ11CA?
SMBJ11CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ11CA 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 SMBJ11CA?
For technical support, including SMBJ11CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ11CA requirements.
6.How does Aetrix verify that SMBJ11CA is sourced from the original manufacturer or authorized distributors?
All SMBJ11CA 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 SMBJ11CA meets industry standards.
7.What is the process for return or replacement of SMBJ11CA?
All SMBJ11CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ11CA, 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 SMBJ11CA part is unused and in its original packaging.
Return procedure for SMBJ11CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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