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Vishay General Semiconductor - Diodes Division SMBJ20CA-E3/5B
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- Part No.:
- SMBJ20CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CA-E3/5B.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
SMBJ20CA-E3/5B 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 and power lines. It features a 20 V stand-off voltage (VWM), 32.4 V maximum clamping voltage (VC) at 18.5 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 μs waveform), protecting sensitive ICs and MOSFETs in industrial and telecom interfaces.
For engineers reviewing the SMBJ20CA-E3/5B datasheet, SMBJ20CA-E3/5B pinout, SMBJ20CA-E3/5B application, or SMBJ20CA-E3/5B equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, low leakage (<1.0 μA at VWM), and AEC-Q101–qualified variants are required - especially in sensor signal conditioning, DC power rail protection, and automotive body electronics.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified between 22.2 V (min) and 24.5 V (max) at 1.0 mA test current. Its clamping behavior is defined under standardized 10/1000 μs surge conditions, delivering consistent transient suppression without polarity dependence.
Thermal performance is characterized by a junction-to-ambient thermal resistance (RθJA) of 100 °C/W and a maximum operating junction temperature of +150 °C. The device meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse stand-off voltage before significant conduction begins; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 22.2 V / 24.5 V at 1.0 mA - Confirmed bidirectional breakdown range; ensures reliable triggering across manufacturing lot variation. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamped voltage during 10/1000 μs surge; limits downstream voltage stress to protected circuitry. |
| PPPM | 600 W - Peak pulse power handling capability; enables compliance with IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge testing. |
| ID @ VWM | <1.0 μA - Ultra-low reverse leakage at rated stand-off; minimizes standby power loss and avoids false triggering. |
| TJ max. | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and standard reflow profiles. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals with identical electrical behavior in either direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path terminal | Either terminal serves as input/output for transient energy; no cathode band or polarity identification required. |
| Case / Body | Non-electrical mechanical interface | Plastic molded housing (UL 94 V-0 rated); provides insulation and mechanical anchoring without electrical connection. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables single-device protection against IEC 61000-4-5 surges up to 1 kV open-circuit / 0.5 kA short-circuit without derating. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage exposure during clamping - critical for safeguarding 3.3 V and 5 V logic interfaces. |
| MSL Level 1 moisture sensitivity | Eliminates bake requirements prior to reflow; supports direct placement into high-volume SMT assembly lines. |
| RoHS-compliant, matte tin-plated leads | Ensures solderability per J-STD-002 and whisker resistance per JESD 201 Class 2 - suitable for long-life industrial deployments. |
| −55 °C to +150 °C operating range | Validates use in extended-temperature applications including automotive cabin modules and outdoor telecom equipment. |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller GPIOs from load-dump and inductive switching transients in door module PCBs. IC Role / Device Role: Bidirectional clamping element placed directly at connector entry point before signal conditioning stage. Use Value: Limits transient voltage to ≤32.4 V, preventing latch-up or gate oxide damage in 5 V tolerant MCU inputs while maintaining <1 μA leakage at 12 V nominal supply. |
Use Scenario: Safeguarding analog outputs of 4–20 mA current-loop transmitters exposed to field wiring surges in factory automation cabinets. IC Role / Device Role: Primary surge shunt across output terminals, coordinated with series current-limiting resistor. Use Value: Clamps 1 kV/500 A surge to 32.4 V within nanoseconds, preserving 16-bit DAC accuracy and avoiding calibration drift from repeated overstress. |
| Telecom Power Supply Input Stage | Consumer USB-C Port ESD Protection |
Use Scenario: Secondary-side transient suppression on +24 V DC input rails feeding PoE-powered network switches. IC Role / Device Role: Final-stage TVS parallel to bulk capacitor, absorbing residual surges escaping upstream MOVs and filters. Use Value: Handles repetitive 600 W pulses at 0.01% duty cycle without degradation, ensuring >10-year field reliability in 24/7 infrastructure gear. |
Use Scenario: Bidirectional line protection for USB-C CC and SBU pins subject to human-body-model (HBM) and IEC 61000-4-2 contact discharge. IC Role / Device Role: Low-capacitance (<50 pF typical) TVS placed adjacent to connector to minimize signal distortion. Use Value: Provides 30 kV air/20 kV contact ESD immunity while adding <0.3 pF parasitic capacitance - negligible impact on 10 Gbps USB 3.2 Gen 2 signaling. |
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-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package; same VWM, VC, and PPPM. | Required for halogen-free BOM compliance in EU medical and public infrastructure projects. | Select when halogen-free material declaration (per IEC 61249-2-21) is mandated by end-equipment regulatory submission. |
| SAC20CA | Same VWM (20 V) and bidirectional function but in smaller SOD-123FL package; lower PPPM (400 W) and higher VC (36.2 V). | Used where board space is constrained and surge threat level is limited to IEC 61000-4-2 Level 4 only. | Choose for compact consumer wearables or portable devices where 600 W headroom is unnecessary and footprint reduction is prioritized. |
Compared with SMBJ20CA-E3/5B, the M3/5B offers identical protection performance with halogen-free construction, while SAC20CA trades 33 % lower surge power and larger clamping voltage for 45 % smaller footprint - making the original optimal for industrial-grade surge resilience where space permits.
Availability
SMBJ20CA-E3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, telecom power supplies, and USB-C port protection requiring stable component supply and full traceability.
Supply support for SMBJ20CA-E3/5B 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, and protection devices with emphasis on reliability, precision, and automotive qualification.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting design-in across automotive, industrial control, and communications infrastructure where failure modes must be eliminated at the component level.
FAQ
What is the maximum clamping voltage of SMBJ20CA-E3/5B under a 10/1000 μs surge?
The SMBJ20CA-E3/5B exhibits a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 18.5 A under the standardized 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and is measured per ANSI/IEEE C62.35. The SMBJ20CA-E3/5B achieves this clamping performance while maintaining bidirectional symmetry and low leakage.
Is SMBJ20CA-E3/5B suitable for automotive applications?
Yes - the base SMBJ20CA-E3/5B is commercial-grade and RoHS-compliant, but Vishay offers AEC-Q101–qualified variants (e.g., SMBJ20CAHE3_B/I) in the same SMB package. While SMBJ20CA-E3/5B itself is not AEC-Q101 certified, its electrical specs, thermal rating (−55 °C to +150 °C), and construction meet foundational requirements for non-safety-critical automotive subsystems such as lighting controls and HVAC sensors.
How does SMBJ20CA-E3/5B differ from unidirectional SMBJ20A-E3/5B?
The SMBJ20CA-E3/5B is bidirectional with symmetrical clamping in both polarities and no cathode marking, whereas SMBJ20A-E3/5B is unidirectional with a cathode band and conducts only in reverse bias. Their VWM (20 V) and VC (32.4 V) match, but SMBJ20A-E3/5B specifies forward surge current (IFSM = 100 A) and VF (≤3.5 V at 50 A), which do not apply to the CA version. SMBJ20CA-E3/5B is selected when AC-coupled or polarity-agnostic protection is needed.
What is the thermal resistance of SMBJ20CA-E3/5B, and how does it affect layout?
The SMBJ20CA-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe operation under repetitive surges, PCB layout must provide adequate copper area and avoid thermal bottlenecks - insufficient copper increases junction temperature and reduces surge endurance. The SMBJ20CA-E3/5B's RθJL of 20 °C/W further emphasizes the importance of short, wide traces to thermal planes.
Does SMBJ20CA-E3/5B require special handling or baking before reflow soldering?
No - SMBJ20CA-E3/5B is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ambient conditions (≤30 °C / 60 % RH) and placed directly into reflow without pre-baking. Its moisture-sensitive level classification eliminates dry-pack requirements and simplifies SMT line integration. The SMBJ20CA-E3/5B's matte tin-plated leads also ensure compatibility with standard SnPb and lead-free reflow profiles peaking at 260 °C.
SMBJ20CA-E3/5B 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-E3/5B FAQ
1.How can I place an order for SMBJ20CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CA-E3/5B 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-E3/5B reliable?
The price and inventory of SMBJ20CA-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ20CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CA-E3/5B?
SMBJ20CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CA-E3/5B 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-E3/5B?
For technical support, including SMBJ20CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CA-E3/5B requirements.
6.How does Aetrix verify that SMBJ20CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ20CA-E3/5B 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-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ20CA-E3/5B?
All SMBJ20CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CA-E3/5B, 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-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ20CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CA-E3/5B Tags
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