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Vishay General Semiconductor - Diodes Division SMB8J20CA-E3/52
- Part No.:
- SMB8J20CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20CA-E3/52.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,750
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Product details
Overview
SMB8J20CA-E3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 20 V stand-off voltage (VWM), 24.7 A peak pulse current (IPPM) under 10/1000 μs waveform, 32.4 V maximum clamping voltage (VC), and AEC-Q101 qualification for automotive electronics.
For engineers reviewing the SMB8J20CA-E3/52 datasheet, SMB8J20CA-E3/52 pinout, SMB8J20CA-E3/52 application, or SMB8J20CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, 800 W peak pulse power rating, low leakage (<1.0 μA at VWM), RoHS-compliant matte tin terminals, and MSL Level 1 moisture sensitivity per J-STD-020.
Technical Context
This device operates as a voltage-clamped shunt protector, responding within picoseconds to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, while the bidirectional configuration enables symmetric clamping across both polarities without polarity-sensitive placement.
The SMB8J20CA-E3/52 is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance of 72 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead). It meets ANSI/IEEE C62.35 standards for transient suppression and is qualified to AEC-Q101 for automotive under-hood and infotainment applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse working voltage before clamping begins |
| VBR (min/max) | 22.2 V / 24.5 V - Breakdown occurs within this range at 1 mA test current |
| VC @ IPPM | 32.4 V - Clamping voltage at 24.7 A peak pulse current; defines worst-case protected line voltage during surge |
| PPPM | 800 W - Peak pulse power handling capability with 10/1000 μs waveform |
| ID @ VWM | <1.0 μA - Reverse leakage ensures minimal standby power loss and signal integrity |
| TJ max. | +150 °C - Enables operation in high-temperature automotive engine compartments |
| Package | SMB (DO-214AA) - Surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case meeting UL 94 V-0 flammability rating; matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; no polarity marking (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; bidirectional clamping eliminates orientation constraints during PCB layout |
| Case (body) | Thermal and mechanical interface | Plastic body provides electrical isolation; copper pad mounting (0.2" × 0.2") required for rated thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to surface contamination or moisture ingress |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning or baking |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage stress on downstream ICs during surge events |
| 800 W peak pulse power | Protects against IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when properly mounted |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Line Protection |
|---|---|
Use Scenario: Protecting LIN/CAN transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt TVS placed directly at connector or IC input pins to clamp transients before they reach sensitive analog front-ends or communication PHYs. Use Value: Maintains signal integrity under 100 V/100 ms load dump events while adding <1.0 μA leakage at 20 V nominal bus voltage. | Use Scenario: Safeguarding two-wire CAN FD physical layer against ESD (IEC 61000-4-2 ±25 kV contact) and fast transient bursts (IEC 61000-4-4) in factory automation nodes. IC Role / Device Role / Timing Role: Bidirectional clamping element across CAN_H–CAN_L differential pair, absorbing common-mode surges without disrupting DC bias or signal symmetry. Use Value: Limits differential voltage excursion to ≤32.4 V during 24.7 A surge, preserving transceiver functionality and preventing false dominant states. |
| Consumer USB Port ESD Protection | Power Supply Input Surge Suppression |
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines in automotive infotainment head units exposed to user-handling discharge. IC Role / Device Role / Timing Role: Low-capacitance TVS placed after primary filtering to absorb residual ±8 kV HBM/±15 kV air-gap discharges without distorting 480 Mbps data eye. Use Value: Adds negligible capacitance (typ. <100 pF at 0 V) while clamping sub-1 ns ESD spikes to safe levels for USB PHY receivers. | Use Scenario: Input-stage surge suppression on 24 V industrial power supplies subjected to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary shunt protector across bulk input capacitor, diverting 800 W energy away from upstream rectifiers and downstream regulators. Use Value: Withstands repeated 10/1000 μs surges up to 24.7 A without degradation, extending system uptime in outdoor or factory-floor deployments. |
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-E3/52 | 1000 W PPPM (unidirectional variant); same VWM/VBR/VC but higher IPPM (30.9 A) | Unidirectional only; requires correct polarity placement; not suitable for differential or AC-coupled lines | Select when higher single-polarity surge margin is needed and polarity is fixed |
| SMCJ20CA-E3/52 | Larger SMC (DO-214AB) package; same electrical specs but 1500 W PPPM and 43.1 A IPPM | Higher thermal mass and power handling; requires larger PCB area and different pad layout | Select when 800 W is insufficient and board space allows SMC footprint |
Compared with SMBJ20CA-E3/52 and SMCJ20CA-E3/52, the SMB8J20CA-E3/52 offers optimal balance of bidirectional protection, compact SMB footprint, and AEC-Q101 compliance-making it preferred for space-constrained automotive signal lines where polarity-agnostic placement and qualification are mandatory.
Availability
SMB8J20CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, consumer USB port protection, and 24 V power supply input stages requiring stable component supply and long-term lifecycle support.
Supply support for SMB8J20CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density, AEC-Q101-qualified transient suppression in automotive and harsh-environment industrial systems.
FAQ
What is the clamping voltage of SMB8J20CA-E3/52 at its rated peak pulse current?
The SMB8J20CA-E3/52 has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 24.7 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMB8J20CA-E3/52 maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMB8J20CA-E3/52 suitable for bidirectional signal line protection?
Yes, SMB8J20CA-E3/52 is explicitly designed as a bidirectional TVS diode, enabling symmetrical clamping on AC-coupled or differential lines such as CAN, LIN, RS-485, or audio paths. Its unmarked SMB package and matched forward/reverse characteristics eliminate polarity concerns during placement. The SMB8J20CA-E3/52 achieves this without compromising leakage (<1.0 μA at 20 V) or response time, making it ideal for noise-sensitive bidirectional interfaces.
Does SMB8J20CA-E3/52 meet automotive reliability standards?
Yes, SMB8J20CA-E3/52 carries AEC-Q101 qualification, confirming compliance with stress tests including high-temperature operating life, temperature cycling, and ESD robustness required for automotive electronics. The "HE3" suffix variant is explicitly designated for automotive use, and the SMB8J20CA-E3/52 shares identical construction, materials, and screening. This makes the SMB8J20CA-E3/52 appropriate for engine control, ADAS sensors, and infotainment systems deployed in vehicles.
What is the maximum operating temperature for SMB8J20CA-E3/52?
The SMB8J20CA-E3/52 has a maximum junction temperature (TJ max.) of +150 °C, validated per its thermal characterization and AEC-Q101 qualification. This rating supports operation in under-hood environments and industrial enclosures where ambient temperatures exceed 105 °C. Derating curves in the Vishay datasheet (Document Number 88422) specify allowable power reduction above 25 °C ambient, ensuring reliable performance of the SMB8J20CA-E3/52 across its full -55 °C to +150 °C storage and operating range.
How does the SMB8J20CA-E3/52 compare to the SMBJ20CA-E3/52 in terms of surge capability?
The SMB8J20CA-E3/52 delivers 800 W peak pulse power (PPPM) in bidirectional mode, whereas the SMBJ20CA-E3/52 offers 1000 W in unidirectional mode. Their clamping voltages (32.4 V vs. 32.4 V) and stand-off voltages (20 V) are identical, but the SMB8J20CA-E3/52's lower PPPM reflects bidirectional energy distribution. The SMB8J20CA-E3/52 remains the only choice when polarity-agnostic protection is required-such as across differential buses-while the SMBJ20CA-E3/52 suits fixed-polarity DC rails needing higher single-direction margin.
SMB8J20CA-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):
- 24.7A
- Power - Peak Pulse:
- 800W
- 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 (SMB)
SMB8J20CA-E3/52 FAQ
1.How can I place an order for SMB8J20CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20CA-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 SMB8J20CA-E3/52 reliable?
The price and inventory of SMB8J20CA-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 SMB8J20CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J20CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20CA-E3/52?
SMB8J20CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20CA-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 SMB8J20CA-E3/52?
For technical support, including SMB8J20CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20CA-E3/52 requirements.
6.How does Aetrix verify that SMB8J20CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J20CA-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 SMB8J20CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J20CA-E3/52?
All SMB8J20CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20CA-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 SMB8J20CA-E3/52 part is unused and in its original packaging.
Return procedure for SMB8J20CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J20CA-E3/52 Tags
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