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Vishay General Semiconductor - Diodes Division SMBJ20CA-E3/52
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- Part No.:
- SMBJ20CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CA-E3/52.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,767
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Product details
Overview
SMBJ20CA-E3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. 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, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ20CA-E3/52 datasheet, SMBJ20CA-E3/52 pinout, SMBJ20CA-E3/52 application, or SMBJ20CA-E3/52 equivalent, key selection criteria include bidirectional transient suppression capability, clamping performance under 10/1000 µs surge, thermal resistance (RθJA = 100 °C/W), RoHS-compliant commercial-grade construction, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the 100 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design per Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) layout for rated power dissipation.
The device delivers 32.4 V clamping voltage at 18.5 A peak pulse current (10/1000 µs), achieving low incremental surge resistance and sub-nanosecond response time to suppress ESD, lightning-induced surges, and inductive switching transients. It meets MSL Level 1 per J-STD-020 and supports reflow up to 260 °C peak temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range. |
| VBR (min/max) | 22.2 V / 24.5 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on during overvoltage events. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 600 W - Peak pulse power handling capacity; validates robustness against IEC 61000-4-5 surge waveforms. |
| IPPM | 18.5 A - Peak surge current supported with 10/1000 µs waveform; sets minimum trace/solder joint current rating. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; mandates ≥5.0 mm × 5.0 mm copper pads for full power derating. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in industrial ambient environments up to +85 °C with margin. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), matte tin-plated leads, UL 94 V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal under negative transient | One side of symmetrical PN junction; connects to line requiring bidirectional clamping. |
| Cathode | Current entry terminal under positive transient | Other side of symmetrical PN junction; ties to same line as Anode - no functional distinction in bidirectional mode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without polarity concerns. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV) surge events when properly mounted on 5.0 mm × 5.0 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot during transients - critical for safeguarding 3.3 V or 5 V logic interfaces downstream. |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 260 °C peak without moisture-related failure risk. |
| RoHS-compliant, commercial grade | E3 suffix confirms lead-free, halogen-free (except Cl/Br), and JEDEC JESD201 Class 2 whisker resistance compliance. |
Applications
| Industrial Motor Control | Telecom Line Interface |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback sensing lines in variable-frequency drives subjected to inductive kickback from contactor switching. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across motor phase outputs and isolated analog inputs to limit transient voltage to ≤32.4 V. Use Value: Prevents latch-up or permanent damage to 20 V-rated op-amps and SiC MOSFET gate oxides during 600 V/µs edge transients. |
Use Scenario: Surge protection on POTS or xDSL line interface circuits exposed to lightning-induced common-mode surges per ITU-T K.20/21. IC Role / Device Role / Timing Role: Placed differentially across tip/ring pairs to clamp bidirectional surges before front-end transformer or line driver IC. Use Value: Maintains signal integrity below 32.4 V clamping level while surviving 10/1000 µs 4 kV surges without degradation. |
| Automotive Body Control Module | Consumer Sensor Hub |
|
Use Scenario: Input protection for LIN bus transceivers and window lift motor control ICs in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Bidirectional TVS installed at connector entry point to absorb load dump and ISO 7637-2 Pulse 1/2/5a transients. Use Value: Withstands repetitive 200 V/100 ms pulses and clamps 18.5 A surges to 32.4 V - compatible with AEC-Q101-qualified variants (HE3 suffix). |
Use Scenario: ESD and surge protection for I²C/SPI lines connecting MEMS accelerometers, gyroscopes, and environmental sensors in smart home devices. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at sensor package pins to suppress HBM ±8 kV and system-level 1 kV surges. Use Value: Sub-100 pF junction capacitance (typ.) avoids signal rise-time degradation on 400 kHz I²C buses while providing 32.4 V clamping ceiling. |
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-M3/52 | Halogen-free variant with identical electrical specs and SMB package; same RoHS compliance but excludes brominated flame retardants. | Required for strict halogen-free compliance programs (e.g., EU EcoDesign, certain automotive Tier 1s); no change in board layout or performance. | Select when halogen-free certification is mandated; otherwise E3/52 offers broader supply chain availability. |
| SAC20CA | Same VWM (20 V) and bidirectional function, but in smaller SOD-123FL package; lower PPPM (400 W), higher VC (36.2 V at 12.5 A). | Better suited for space-constrained consumer PCBs where 600 W rating is not required; less effective for high-energy industrial surges. | Choose SAC20CA only if footprint reduction outweighs 33% lower surge power and 11.7% higher clamping voltage. |
Compared with SMBJ20CA-E3/52, the M3/52 variant offers identical protection performance with halogen-free materials, while SAC20CA trades surge robustness and clamping tightness for compact size - making SMBJ20CA-E3/52 optimal for industrial and telecom designs demanding full 600 W capability and lowest possible VC.
Availability
SMBJ20CA-E3/52 is available at Aetrix Electronics and suitable for industrial motor control, telecom line interface, automotive body electronics, and consumer sensor hub designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant commercial-grade TVS protection.
Supply support for SMBJ20CA-E3/52 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 diodes, rectifiers, TVS devices, and power MOSFETs with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and automotive subsystems where consistent clamping performance and AEC-Q101 qualification options are essential.
FAQ
What is the clamping voltage of SMBJ20CA-E3/52 at its rated peak pulse current?
The SMBJ20CA-E3/52 has a maximum clamping voltage (VC) of 32.4 V at 18.5 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ20CA-E3/52 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) when mounted per Vishay's recommended pad layout.
Is SMBJ20CA-E3/52 suitable for protecting RS-485 communication lines?
Yes, SMBJ20CA-E3/52 is well-suited for RS-485 line protection due to its bidirectional configuration, 32.4 V clamping voltage, and low leakage (<1.0 µA at 20 V). It can be placed differentially across A/B lines or common-mode across A/GND and B/GND to suppress ESD and surge transients without distorting the ±1.5 V to ±6 V differential signaling range. The SMBJ20CA-E3/52's 600 W rating exceeds IEC 61000-4-5 Level 3 requirements, making it appropriate for industrial RS-485 nodes.
Does SMBJ20CA-E3/52 have AEC-Q101 qualification?
No, SMBJ20CA-E3/52 is a commercial-grade part with RoHS compliance (E3 suffix) but not AEC-Q101 qualified. For automotive applications requiring AEC-Q101 validation, the equivalent part is SMBJ20CAHE3_B/H (or HE3 suffix variants), which shares identical electrical specifications and SMB package but adds stress testing per AEC-Q101. The SMBJ20CA-E3/52 remains suitable for non-safety-critical automotive body electronics where qualification is not mandated.
What is the thermal resistance and recommended PCB layout for SMBJ20CA-E3/52?
The SMBJ20CA-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W, measured with 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To achieve rated 600 W pulse power and avoid thermal runaway, Vishay specifies this minimum pad area - using smaller pads increases RθJA and reduces safe surge repetition rate. The SMBJ20CA-E3/52 must be placed with unobstructed thermal relief and no solder mask over thermal pads for optimal heat dissipation.
How does SMBJ20CA-E3/52 differ from unidirectional SMBJ20A-E3/52?
The SMBJ20CA-E3/52 is bidirectional with symmetrical clamping in both polarities and no cathode band marking, whereas SMBJ20A-E3/52 is unidirectional with a visible cathode band and only clamps positive transients (reverse-biased). Electrically, SMBJ20CA-E3/52 has identical VWM (20 V), VBR (22.2–24.5 V), and VC (32.4 V) ratings but supports AC or floating-line protection. The SMBJ20CA-E3/52 replaces two unidirectional devices in differential applications, simplifying BOM and layout.
SMBJ20CA-E3/52 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-E3/52 FAQ
1.How can I place an order for SMBJ20CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CA-E3/52 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-E3/52 reliable?
The price and inventory of SMBJ20CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ20CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CA-E3/52?
SMBJ20CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CA-E3/52 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-E3/52?
For technical support, including SMBJ20CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CA-E3/52 requirements.
6.How does Aetrix verify that SMBJ20CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ20CA-E3/52 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-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ20CA-E3/52?
All SMBJ20CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CA-E3/52, 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-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ20CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CA-E3/52 Tags
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