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Vishay General Semiconductor - Diodes Division SMB8J20CAHE3/52
- Part No.:
- SMB8J20CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20CAHE3/52.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,203
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Product details
Overview
SMB8J20CAHE3/52 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 20 V stand-off voltage (VWM), 32.4 V maximum clamping voltage (VC) at 24.7 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J20CAHE3/52 datasheet, SMB8J20CAHE3/52 pinout, SMB8J20CAHE3/52 application, or SMB8J20CAHE3/52 equivalent, this AEC-Q101 qualified TVS offers verified bidirectional clamping performance, low leakage (<1.0 µA at 20 V), and MSL Level 1 reflow compatibility - critical for automotive-grade ESD/surge hardening in CAN, LIN, and analog sensor front-ends.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) of 22.2–24.5 V at 1.0 mA test current and clamps transients to ≤32.4 V at 24.7 A. Its glass-passivated junction ensures stable avalanche behavior under repetitive surge stress.
Thermal resistance is characterized at RθJA = 72 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 20 °C/W, enabling reliable operation up to TJ = +150 °C. The device meets JESD201 Class 2 whisker resistance and is rated for -55 °C to +150 °C operating/storage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 24 V nominal systems. |
| VBR min/max | 22.2 V / 24.5 V at 1.0 mA - tight breakdown window ensures predictable turn-on and minimal overvoltage during fast transients. |
| VC @ IPPM | 32.4 V at 24.7 A - clamping voltage under 10/1000 µs surge; protects downstream ICs rated for ≤36 V absolute max. |
| PPPM | 800 W - peak pulse power handling capability; supports IEC 61000-4-5 Level 3 (1 kV/42 Ω) surge immunity. |
| ID @ VWM | <1.0 µA - ultra-low reverse leakage preserves signal integrity and battery life in always-on sensor circuits. |
| Package | SMB (DO-214AA) - surface-mount footprint (4.57 mm × 3.94 mm) compatible with automated placement and IPC-7351B land patterns. |
| AEC-Q101 | Qualified - validated for automotive applications including engine control units, body electronics, and ADAS sensor modules. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; polarity unmarked for bidirectional configuration - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | No polarity marking required; either terminal serves as input/output for transient energy absorption in both directions. |
| Cathode Band (absent) | Non-polarized terminal identification | Confirms bidirectional construction - eliminates risk of incorrect orientation during PCB assembly. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, mechanical shock, and humidity testing per JEDEC standards. |
| Glass-passivated junction | Ensures stable, repeatable avalanche characteristics over lifetime and prevents parameter drift under thermal stress. |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without moisture-induced popcorning or delamination. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes let-through voltage during surge events - critical for protecting 3.3 V/5 V logic and precision analog front-ends. |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed automotive and industrial enclosures. |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and analog pressure/temperature sensors in engine compartments exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor line and ground, absorbing ±100 V/50 A transients within nanoseconds. Use Value: Prevents latch-up or permanent damage to 12-bit ADCs and CAN/LIN PHYs while maintaining <1 µA leakage at 12 V supply rails. |
Use Scenario: Safeguarding PLC digital input modules against induced surges from relay coil switching and motor drive noise. IC Role / Device Role / Timing Role: Primary surge suppression element on 24 V DC input channels, shunting >800 W transient energy away from optocoupler inputs. Use Value: Enables compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) without additional RC filtering or layout complexity. |
| Automotive Body Control Module | Consumer Appliance Motor Drive Interface |
|
Use Scenario: Securing door lock actuator drivers and interior lighting PWM outputs against back-EMF spikes during inductive switching. IC Role / Device Role / Timing Role: Low-inductance TVS mounted directly at connector entry point, clamping transients before reaching MCU GPIOs or driver ICs. Use Value: Eliminates need for discrete Zener + capacitor networks - reduces BOM count by 2 components per protected line. |
Use Scenario: Shielding BLDC motor controller gate drivers and Hall-effect position feedback lines in washing machines and HVAC fans. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) bidirectional clamp on low-voltage signal paths interfacing with noisy high-current motor phases. Use Value: Maintains signal fidelity during commutation events while surviving repeated 1000-cycle surge stress per IEC 61000-4-5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CAHE3/52 | Unqualified commercial version; same VWM, VC, and PPPM but lacks AEC-Q101 validation and JESD201 whisker testing. | Restricted to non-automotive industrial or consumer use where qualification traceability is not mandated. | Select when cost sensitivity outweighs automotive qualification requirements and long-term reliability under thermal cycling is not critical. |
| SMCJ20CAHE3/52 | Same electrical specs but in larger SMC (DO-214AB) package - 7.11 mm × 6.22 mm vs. SMB's 4.57 mm × 3.94 mm; higher RθJA (50 °C/W). | Better suited for high-power board-level protection where space allows and thermal dissipation via heatsinking is feasible. | Choose when system-level surge energy exceeds 800 W or when PCB layout permits larger footprint and improved thermal coupling to copper planes. |
Compared with SMBJ20CAHE3/52 and SMCJ20CAHE3/52, SMB8J20CAHE3/52 uniquely balances AEC-Q101 compliance, compact SMB footprint, and 800 W surge capacity - making it optimal for space-constrained automotive modules requiring full qualification traceability.
Availability
SMB8J20CAHE3/52 is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and consumer appliance designs requiring stable component supply with full AEC-Q101 documentation and RoHS/halogen-free compliance.
Supply support for SMB8J20CAHE3/52 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and qualification rigor.
The SMB8JxxCA series targets automotive and industrial transient suppression, engineered specifically to meet stringent AEC-Q101 requirements while delivering consistent clamping performance across temperature and lifetime.
FAQ
What is the maximum clamping voltage of SMB8J20CAHE3/52 under standard surge conditions?
The SMB8J20CAHE3/52 clamps to a maximum of 32.4 V when subjected to its rated peak pulse current of 24.7 A using the industry-standard 10/1000 µs waveform. This value is measured at TA = 25 °C and reflects worst-case let-through voltage seen by protected circuitry - critical for ensuring compatibility with 3.3 V or 5 V logic interfaces downstream of the SMB8J20CAHE3/52.
Is SMB8J20CAHE3/52 suitable for bidirectional signal line protection such as RS-485 or CAN bus?
Yes, SMB8J20CAHE3/52 is explicitly designed as a bidirectional TVS diode, making it appropriate for differential or AC-coupled signal lines like RS-485 and CAN. Its symmetrical breakdown (22.2–24.5 V) and clamping behavior protect both polarities equally, and its low capacitance (typ. <100 pF at 0 V) avoids signal integrity degradation at data rates up to 1 Mbps - confirmed in Vishay's application notes for SMB8JxxCA in automotive communication interfaces.
Does SMB8J20CAHE3/52 require special PCB layout considerations beyond standard SMB footprints?
Yes - Vishay specifies mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 800 W pulse power and thermal performance. Reducing pad size increases junction temperature rise and de-rates IPPM; the SMB8J20CAHE3/52 datasheet Figure 2 provides derating curves based on ambient temperature and pad area. Use of internal ground planes and thermal vias is recommended for sustained surge duty cycles.
How does the HE3 suffix affect the specifications of SMB8J20CAHE3/52 compared to non-HE3 variants?
The HE3 suffix denotes RoHS-compliant, halogen-free, and AEC-Q101 qualified construction - it does not alter electrical parameters but confirms compliance with automotive reliability standards including temperature cycling, mechanical shock, and whisker resistance (JESD201 Class 2). The SMB8J20CAHE3/52 shares identical VWM, VBR, VC, and PPPM with SMB8J20CA-E3, but only HE3 carries full automotive qualification documentation and traceability required for Tier 1 automotive BOMs.
Can SMB8J20CAHE3/52 be used in place of unidirectional TVS diodes like SMBJ20AHE3/52?
No - SMB8J20CAHE3/52 is strictly bidirectional and lacks polarity marking, whereas SMBJ20AHE3/52 is unidirectional with cathode band identification. Substituting them risks improper clamping on positive-going transients in DC-biased circuits. For unidirectional protection (e.g., 24 V supply rail), SMBJ20AHE3/52 is required; SMB8J20CAHE3/52 applies only where symmetrical surge suppression is needed, such as AC-coupled or floating signal lines.
SMB8J20CAHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J20CAHE3/52 FAQ
1.How can I place an order for SMB8J20CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20CAHE3/52 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 SMB8J20CAHE3/52 reliable?
The price and inventory of SMB8J20CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J20CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J20CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20CAHE3/52?
SMB8J20CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20CAHE3/52 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 SMB8J20CAHE3/52?
For technical support, including SMB8J20CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20CAHE3/52 requirements.
6.How does Aetrix verify that SMB8J20CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J20CAHE3/52 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 SMB8J20CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J20CAHE3/52?
All SMB8J20CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20CAHE3/52, 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 SMB8J20CAHE3/52 part is unused and in its original packaging.
Return procedure for SMB8J20CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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