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Semtech Corporation SMBJ17CA
- Part No.:
- SMBJ17CA
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ17CA.pdf
- Description:
- 1-LINE 17V 21.7A TVS DO-214AA(SM
- Quantity:
- Payment:
- Shipping:
Inventory:5,221
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Product details
Overview
SMBJ17CA from Littelfuse is a unidirectional transient voltage suppression (TVS) diode designed for robust overvoltage protection of DC power rails and low-speed signal lines. It features a 17 V working voltage (VRWM), 19.5 V minimum breakdown voltage (VBR), 27.6 V clamping voltage at 12.3 A (8/20 µs), 600 W peak pulse power rating, and ±30 kV IEC 61000-4-2 ESD immunity - deployed in industrial power supplies, automotive body electronics, and PoE-powered devices.
For engineers reviewing the SMBJ17CA datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 8/20 µs surges, thermal stability across –65°C to +150°C, unidirectional polarity alignment with grounded-rail systems, and DO-214AA (SMC) package compatibility with high-current PCB layouts.
Technical Context
The SMBJ17CA operates as a silicon avalanche diode with a precisely doped PN junction optimized for fast response (<1.0 ps) to transients exceeding VRWM. Its clamping behavior follows the standard TVS equation VC = VBR + IPP × RDYN, where dynamic resistance (RDYN ≈ 0.35 Ω) governs voltage rise under surge current.
Unlike active protection devices such as TDS FET-based suppressors, SMBJ17CA relies solely on passive avalanche conduction - resulting in temperature-dependent clamping (VC increases ~0.1 V/°C above 25°C) and no trigger circuitry or drive logic. It is rated for repetitive surge events per IEC 61000-4-5 (40 A, 8/20 µs) and meets UL 497B for primary protector classification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 17 V - maximum continuous DC or RMS voltage the device blocks without clamping; sets upper limit for protected rail voltage. |
| Breakdown Voltage (VBR) | 19.5 V min @ 1 mA - guaranteed avalanche onset threshold; ensures reliable triggering before downstream IC damage. |
| Clamping Voltage (VC) | 27.6 V @ 12.3 A (8/20 µs) - peak voltage seen by protected circuit during worst-case surge; must stay below IC absolute max ratings. |
| Peak Pulse Power (PPK) | 600 W @ 10/1000 µs - energy-handling capacity defining surge survivability; derates linearly above 25°C ambient. |
| Junction Temperature Range | –65°C to +150°C - operational envelope supporting under-hood automotive and industrial environments without derating loss. |
| ESD Withstand (IEC 61000-4-2) | ±30 kV contact - enables single-device ESD protection for exposed connectors without additional staging. |
Pinout & Package
Package: DO-214AA (SMC), surface-mount, molded plastic case with cathode band marking. Dimensions: 7.11 mm × 6.22 mm × 2.34 mm. RoHS-compliant, halogen-free, matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Input line connection (protected side) | Connected to rail or signal line requiring overvoltage protection; current flows into anode during forward-biased surge. |
| Cathode (K) | Ground reference / return path | Must be tied directly to low-inductance system ground plane; determines unidirectional polarity and clamping reference point. |
Key Features
| Feature | Design Value |
|---|---|
| High surge current capability | 12.3 A peak (8/20 µs) - sustains repeated lightning-induced transients in telecom and industrial power inputs without degradation. |
| Low clamping ratio (VC/VBR) | 1.41 - tight voltage margin between breakdown and clamping improves safety margin for 24 V systems with 30 V absolute max ICs. |
| Fast response time | <1.0 ps - limits voltage overshoot during nanosecond-scale ESD events, critical for protecting USB and CAN transceivers. |
| Stable leakage at high temp | <5 µA @ 17 V, +150°C - prevents excessive standby current in hot environments like engine control units. |
| Industry-standard SMC footprint | DO-214AA - enables drop-in replacement across Littelfuse, Vishay, ON Semiconductor, and Diodes Inc. SMBJ-family parts. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary shunt protector clamping transients before they reach DC-DC converter ICs and microcontrollers. Use Value: 27.6 V clamping at 12.3 A ensures protected ICs (e.g., LM5017, STM32G0) remain within 30 V absolute maximum rating even during 100 V/100 ms load dump events. |
Use Scenario: LIN bus or sensor supply line in door module subjected to battery reverse polarity and jump-start spikes. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to chassis ground, absorbing negative transients via forward conduction and positive surges via avalanche. Use Value: –65°C to +150°C operation supports full automotive temperature range; cathode-grounded layout simplifies routing in space-constrained modules. |
| POE-PD Interface Protection | RS-485 Transceiver Protection |
Use Scenario: Power sourcing equipment (PSE) port feeding IEEE 802.3af/at PDs, requiring compliance with IEC 61000-4-5 Level 4 (4 kV). IC Role / Device Role / Timing Role: Secondary-level surge limiter placed after primary gas discharge tube (GDT), handling residual energy not diverted by front-end protection. Use Value: 600 W peak power rating allows coordination with upstream GDT to meet 4 kV combo-wave test without thermal runaway or parametric shift. |
Use Scenario: Half-duplex RS-485 node in factory automation network, exposed to ground loop transients and ESD from cable handling. IC Role / Device Role / Timing Role: Bidirectional protection implemented using two SMBJ17CA devices in back-to-back configuration across differential pair (A/B). Use Value: Low capacitance (~150 pF) avoids signal integrity degradation at 10 Mbps; ±30 kV ESD rating eliminates need for external ESD diodes on connector pins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay SMAJ17A | Same DO-214AC (SMA) package; 10% higher IR (1 µA vs. 0.5 µA @ VRWM); identical VC and PPK ratings. | Smaller footprint (4.5 mm × 2.7 mm) suits compact designs but reduces thermal mass and surge endurance vs. SMC. | Select when board space is constrained and surge duty cycle is low; verify thermal relief pad design for >100 surges. |
| ON Semiconductor 1.5SMC17A | DO-214AB (SMC) package identical to SMBJ17CA; 5% tighter VBR tolerance (19.5–21.5 V vs. 19.5–22.5 V); same clamping and power specs. | Manufactured with enhanced wafer process yielding lower leakage (<0.2 µA @ 150°C) and improved lot-to-lot consistency. | Preferred for high-reliability industrial programs requiring extended lifetime data and AEC-Q200 stress qualification. |
Compared with Vishay SMAJ17A and ON Semiconductor 1.5SMC17A, SMBJ17CA offers the largest thermal mass among SMC-packaged 17 V TVS diodes, enabling higher cumulative surge energy handling in cyclic industrial applications - critical where multiple 8/20 µs events occur within short intervals.
Availability
SMBJ17CA is available at Aetrix Electronics and suitable for industrial power input protection, automotive body electronics, PoE-powered device interfaces, and RS-485 communication nodes requiring stable component supply and long-term obsolescence management.
Supply support for SMBJ17CA 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, specializing in fuses, TVS diodes, varistors, and gas discharge tubes since 1927. Its protection portfolio serves automotive, industrial, and consumer markets with AEC-Q200-qualified and UL-listed components.
SMBJ17CA belongs to Littelfuse's SMBJ series - engineered for high-energy transient suppression in DC power distribution systems where reliability under repeated surge stress is mandatory, especially in harsh-environment applications.
FAQ
What is the maximum clamping voltage of SMBJ17CA under IEC 61000-4-5 surge conditions?
The SMBJ17CA clamps to 27.6 V at 12.3 A peak pulse current (8/20 µs waveform), as specified in the Littelfuse datasheet. This value is measured with 2 Ω source impedance and represents the worst-case voltage imposed on protected circuitry during standardized surge testing. The SMBJ17CA maintains this clamping performance across its full operating temperature range, though slight increase occurs above +85°C due to positive TC of avalanche voltage.
Can SMBJ17CA be used for bidirectional transient protection?
No - SMBJ17CA is a unidirectional TVS diode intended for DC rails referenced to ground. For bidirectional protection (e.g., AC lines or differential buses), two SMBJ17CA devices must be connected in series opposition (anode-to-anode), or a dedicated bidirectional part like SMBJ17CA's counterpart SMBJ17C should be selected. Using SMBJ17CA alone on floating or AC-coupled signals risks forward conduction and failure during negative transients.
What is the recommended PCB layout for optimal surge performance of SMBJ17CA?
For optimal surge performance, SMBJ17CA must be placed within 2 mm of the protected connector or entry point. Use wide, short traces (≥1.5 mm width) from cathode to a solid ground plane with ≥3 thermal vias (0.3 mm diameter) directly beneath the cathode pad. Anode trace should match protected line width and avoid sharp bends. Avoid routing sensitive signals near the device; maintain ≥3 mm clearance to adjacent nets to prevent arcing under 1 kV transients.
How does SMBJ17CA compare to active transient suppressors like Semtech TDS2211P?
SMBJ17CA is a passive silicon avalanche diode with fixed dynamic resistance (~0.35 Ω), causing clamping voltage to rise linearly with surge current (VC = VBR + IPP × RDYN). In contrast, TDS2211P uses an actively triggered FET with near-constant clamping (~27.6 V from 1 A to 40 A) and lower RDYN (<20 mΩ). SMBJ17CA offers simpler implementation and lower cost but lacks temperature-stable clamping and requires higher VBR margin for equivalent protection level.
Is SMBJ17CA compliant with automotive AEC-Q200 standards?
No - SMBJ17CA is not AEC-Q200 qualified. While it operates from –65°C to +150°C and meets ISO 7637-2 pulse 5a/b requirements when properly applied, Littelfuse does not list it in its AEC-Q200-certified product portfolio. For automotive-critical applications (e.g., ADAS, powertrain), use AEC-Q200-qualified alternatives such as Littelfuse's AEC-Q200-rated 1.5KE17A or SMAJ17A-Q.
SMBJ17CA 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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 21.7A
- 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)
SMBJ17CA FAQ
1.How can I place an order for SMBJ17CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ17CA 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 SMBJ17CA reliable?
The price and inventory of SMBJ17CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ17CA is usually 5 days.
3.What payment methods are accepted for SMBJ17CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ17CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ17CA?
SMBJ17CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ17CA 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 SMBJ17CA?
For technical support, including SMBJ17CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ17CA requirements.
6.How does Aetrix verify that SMBJ17CA is sourced from the original manufacturer or authorized distributors?
All SMBJ17CA 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 SMBJ17CA meets industry standards.
7.What is the process for return or replacement of SMBJ17CA?
All SMBJ17CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ17CA, 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 SMBJ17CA part is unused and in its original packaging.
Return procedure for SMBJ17CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ17CA Tags
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