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Vishay General Semiconductor - Diodes Division SMBJ20CA/54
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- Part No.:
- SMBJ20CA/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CA/54.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,940
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Product details
Overview
SMBJ20CA/54 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 32.4 V maximum clamping voltage (VC) at 18.5 A peak pulse current (IPPM), and 600 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed on power rails and signal lines in industrial sensor interfaces and telecom infrastructure.
For engineers reviewing the SMBJ20CA/54 datasheet, SMBJ20CA/54 pinout, SMBJ20CA/54 application, or SMBJ20CA/54 equivalent, this device is selected for bidirectional surge suppression where low clamping ratio, fast response time (<1 ns), and AEC-Q101 qualification options are critical - especially in automotive body control modules, PoE-powered devices, and RS-485 transceiver protection circuits.
Technical Context
The SMBJ20CA/54 operates as a bidirectional avalanche diode, symmetrically clamping transient voltages above ±22.2 V in either polarity without polarity marking. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling consistent clamping performance under repetitive 10/1000 µs surges at 0.01% duty cycle.
Thermally, it exhibits RθJA = 100 °C/W and RθJL = 20 °C/W, supporting reliable operation up to TJ = +150 °C when mounted on 5.0 mm × 5.0 mm copper pads per terminal. The device meets MSL Level 1 (JEDEC J-STD-020) and supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 22.2–24.5 V at 1 mA - Confirmed bidirectional avalanche onset range; ensures symmetrical protection in AC-coupled or floating lines. |
| VC (Clamping Voltage) | 32.4 V at IPPM = 18.5 A - Peak voltage seen by protected circuit during 10/1000 µs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capability under standardized surge waveform; validates compliance with IEC 61000-4-5 Level 4. |
| ID (Max Reverse Leakage) | 1.0 µA at VWM - Ultra-low leakage preserves signal integrity and battery life in always-on sensor nodes. |
| TJ max. | +150 °C - Enables deployment in under-hood automotive or high-ambient industrial environments without derating. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - both terminals electrically identical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | No functional distinction between terminals; connects across protected line and return path (e.g., differential pair or supply rail). |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validated surge immunity for IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-earth) without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes voltage overshoot during transients - critical for protecting 3.3 V or 5 V logic interfaces downstream. |
| Fast response time (< 1 ns) | Clamps ESD and lightning-induced spikes before they propagate into IC inputs, preserving data integrity. |
| MSL Level 1, 260 °C reflow compatible | Enables standard SMT assembly without moisture sensitivity concerns or baking requirements. |
| AEC-Q101 qualified variants available | Supports automotive-grade sourcing (e.g., SMBJ20CAHE3_B/H) for body electronics and infotainment systems. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting analog output lines (4–20 mA) and digital I/O (CAN/LIN) from load dump and inductive switching noise in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and ground to clamp ±2 kV EFT bursts and 100 V load dump transients. Use Value: Prevents latch-up and permanent damage to precision ADCs and microcontroller GPIOs while maintaining <1 µA leakage at 20 V system rail. |
Use Scenario: Safeguarding LIN bus transceivers and door module microcontrollers against battery reversal and jump-start surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on LIN data line (VWM = 20 V) to absorb 12 V system-level transients without interfering with 9–16 V operating window. Use Value: Eliminates need for external series resistors or RC filters - reduces BOM count and PCB area while meeting ISO 16750-2 pulse 5a/b requirements. |
| Telecom Power over Ethernet (PoE) | Consumer USB-C Port Protection |
Use Scenario: Clamping induced surges on 48 V DC power pairs in IEEE 802.3af/at PD circuits exposed to outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional TVS across each PoE pair (spare or data pairs) to limit common-mode transients to <35 V peak. Use Value: Ensures sustained operation after repeated 10/1000 µs surges up to 600 W - validated for >1000 cycles without parameter shift. |
Use Scenario: Guarding USB-C CC and VBUS lines against ESD (±15 kV air, ±8 kV contact) and hot-plug voltage overshoot. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 100 pF at 0 V) placed directly at connector to suppress sub-ns ESD events before reaching USB controller. Use Value: Maintains signal integrity for USB 2.0 data rates (480 Mbps) while limiting VBUS clamping to 32.4 V during 8/20 µs surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA-E3/54 | Same electrical specs and SMB package; RoHS-compliant commercial grade (no AEC-Q101 qualification). | Lacks automotive qualification; suitable for industrial/commercial designs not requiring AEC-Q101 traceability. | Select when cost-sensitive volume production requires standard commercial-grade TVS without automotive certification overhead. |
| SAC20CA | Same VWM (20 V) and VC (32.4 V), but in smaller SOD-123FL package; lower PPPM (400 W) and higher thermal resistance (RθJA = 150 °C/W). | Lower power handling limits use to low-energy transients (e.g., ESD-only); unsuitable for IEC 61000-4-5 Level 4. | Choose only for space-constrained consumer applications where peak surge energy remains below 400 W and ambient temperature stays ≤85 °C. |
Compared with SMBJ20CA/54, SMBJ20CA-E3/54 offers identical protection performance with simplified compliance documentation, while SAC20CA trades power robustness and thermal margin for footprint reduction - making SMBJ20CA/54 the optimal choice for high-reliability industrial and automotive applications demanding full 600 W surge capacity and AEC-Q101 support.
Availability
SMBJ20CA/54 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and telecom PoE-powered devices requiring stable component supply, long-term lifecycle assurance, and traceable AEC-Q101 qualified sourcing.
Supply support for SMBJ20CA/54 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for industrial, automotive, and computing markets.
The SMBJ series is engineered for high-power transient suppression in harsh environments, emphasizing low clamping voltage, repeatable surge endurance, and seamless integration into automated SMT lines.
FAQ
What is the clamping voltage of SMBJ20CA/54 at its rated peak pulse current?
The SMBJ20CA/54 has a maximum clamping voltage (VC) of 32.4 V at its peak pulse current (IPPM) of 18.5 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the highest voltage imposed on the protected circuit during worst-case surge conditions. The SMBJ20CA/54 maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C) when properly mounted on recommended copper pads.
Is SMBJ20CA/54 unidirectional or bidirectional, and how does that affect its placement?
SMBJ20CA/54 is a bidirectional TVS diode, meaning it provides symmetrical clamping for voltage transients of either polarity - ideal for AC-coupled lines, differential buses (e.g., RS-485), or floating power domains. Unlike unidirectional variants (e.g., SMBJ20A), it has no cathode band marking and can be installed without orientation constraints. This simplifies layout and eliminates risk of reverse installation during automated placement - a key advantage confirmed in Vishay's mechanical drawings and ordering notes.
Does SMBJ20CA/54 meet automotive qualification standards?
SMBJ20CA/54 itself is a commercial-grade part; however, Vishay offers AEC-Q101 qualified versions under ordering codes such as SMBJ20CAHE3_B/H (RoHS-compliant, AEC-Q101) and SMBJ20CAHM3_B/H (halogen-free, AEC-Q101). These variants share identical electrical characteristics and SMB package dimensions with SMBJ20CA/54 but include full automotive qualification testing and traceability. For automotive designs, specify the HE3 or HM3 suffix to ensure compliance.
What is the maximum reverse leakage current for SMBJ20CA/54 at its stand-off voltage?
The SMBJ20CA/54 exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 20 V stand-off voltage (VWM), measured at TA = 25 °C. This ultra-low leakage preserves signal fidelity in high-impedance sensor circuits and minimizes standby power loss in battery-operated devices. Leakage remains below 5 µA up to +85 °C, as verified in Vishay's thermal derating curves and electrical characteristics table.
Can SMBJ20CA/54 be used in place of SMBJ20A in an existing design?
No - SMBJ20CA/54 and SMBJ20A are not interchangeable without circuit review. SMBJ20CA/54 is bidirectional with symmetrical clamping, while SMBJ20A is unidirectional and requires correct cathode orientation. Substituting SMBJ20CA/54 for SMBJ20A may cause unintended conduction in DC-biased rails. Always verify polarity requirements and clamping symmetry in the target application before replacement; Vishay explicitly separates these types in its ordering matrix and electrical tables.
SMBJ20CA/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 18.5A
- 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 (SMBJ)
SMBJ20CA/54 FAQ
1.How can I place an order for SMBJ20CA/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CA/54 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 SMBJ20CA/54 reliable?
The price and inventory of SMBJ20CA/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20CA/54 is usually 5 days.
3.What payment methods are accepted for SMBJ20CA/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CA/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CA/54?
SMBJ20CA/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CA/54 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 SMBJ20CA/54?
For technical support, including SMBJ20CA/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CA/54 requirements.
6.How does Aetrix verify that SMBJ20CA/54 is sourced from the original manufacturer or authorized distributors?
All SMBJ20CA/54 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 SMBJ20CA/54 meets industry standards.
7.What is the process for return or replacement of SMBJ20CA/54?
All SMBJ20CA/54 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CA/54, 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 SMBJ20CA/54 part is unused and in its original packaging.
Return procedure for SMBJ20CA/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CA/54 Tags
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