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Vishay General Semiconductor - Diodes Division SMB8J20CAHE3_A/I
- Part No.:
- SMB8J20CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20CAHE3_A/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J20CAHE3_A/I 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), 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_A/I datasheet, SMB8J20CAHE3_A/I pinout, SMB8J20CAHE3_A/I application, or SMB8J20CAHE3_A/I equivalent, key selection criteria include AEC-Q101 qualification, bidirectional clamping symmetry, low thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped crowbar device during transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional architecture enables symmetric clamping above ±22.2 V breakdown (VBR min) and below ±24.5 V (VBR max) at 1 mA test current.
Thermally, it sustains operation from –55 °C to +150 °C junction temperature, with RθJA = 72 °C/W (typ.) and RθJL = 20 °C/W (typ.), enabling reliable performance under repeated 800 W surges when mounted per recommended pad layout. The matte tin-plated leads meet J-STD-002 solderability and JESD22-B102 whisker testing (Class 2).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin for protected line. |
| VBR (min/max) | 22.2 V / 24.5 V - breakdown occurs within this range at 1 mA; ensures predictable turn-on threshold across production lot. |
| VC @ IPPM | 32.4 V at 24.7 A - clamping voltage during 10/1000 µs surge; limits downstream IC stress to safe level under rated energy. |
| PPPM | 800 W - peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge immunity when properly laid out. |
| ID @ VWM | ≤ 1 μA - ultra-low reverse leakage at stand-off voltage; preserves signal integrity and minimizes standby power loss. |
| TJ max. | +150 °C - maximum junction temperature rating; enables use in under-hood automotive environments and sealed industrial enclosures. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per AEC standard. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical terminals suitable for AC-coupled or differential signal lines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts surge current bidirectionally once VBR is exceeded in either polarity. |
| Case (body) | Thermal and mechanical interface | Plastic molded case transfers heat to PCB copper pads; requires 0.2" × 0.2" (5.0 mm × 5.0 mm) minimum pad area per terminal per datasheet fig. 2. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics including engine control modules and ADAS sensor interfaces requiring long-term field reliability. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage exposure during transients - critical for protecting 24 V-rated CAN FD or LIN transceivers. |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without moisture sensitivity concerns - eliminates baking requirement in high-volume SMT lines. |
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime; resists humidity-induced parameter drift in harsh industrial environments. |
| RoHS-compliant & halogen-free option | HE3 suffix denotes RoHS compliance; HM3 suffix adds halogen-free molding compound - meets EU ELV and JEDEC J-STD-609a requirements. |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
|
Use Scenario: Protecting CAN bus PHY lines and wheel speed sensor outputs against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before reaching transceiver IC. Use Value: Limits clamped voltage to ≤32.4 V during 800 W transients, ensuring survival of 36 V-tolerant CAN FD receivers and preserving signal fidelity. |
Use Scenario: Safeguarding 4–20 mA current loop inputs in programmable logic controllers exposed to relay coil switching noise. IC Role / Device Role / Timing Role: Fast-response TVS placed across input terminals to absorb inductive kickback before op-amp front-end. Use Value: Sub-ns response and 1 μA leakage prevent measurement offset drift while clamping 24 V loop surges to safe levels. |
| Telecom Line Card Protection | Consumer Appliance Motor Control |
|
Use Scenario: Shielding Ethernet PHY magnetics and PoE injectors from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on secondary side of isolation transformer to limit common-mode transients. Use Value: 800 W PPPM rating supports IEC 61000-4-5 combination wave testing up to 4 kV, meeting EN 61000-6-2 immunity requirements. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Snubber-style TVS across motor terminals to clamp back-EMF and reduce EMI radiated into MCU subsystems. Use Value: 20 °C/W junction-to-lead thermal resistance enables rapid heat dissipation into PCB copper, sustaining repeated surge events without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J20CAHM3_A/I | Halogen-free molding compound; identical electrical specs and AEC-Q101 qualification. | Required where halogen-free compliance is mandated by OEM environmental specifications (e.g., VW 80101). | Select when regulatory documentation must explicitly state halogen-free material content. |
| SMAJ20CAHE3_A/I | Same VWM (20 V) and VC (32.4 V), but lower PPPM (400 W); SMA package (smaller footprint, higher RθJA = 90 °C/W). | Suitable for space-constrained consumer designs with lower surge threat profiles (e.g., IEC 61000-4-2 ESD only). | Choose only if board layout cannot accommodate SMB's larger pad area and thermal mass is sufficient for reduced power rating. |
Compared with SMB8J20CAHE3_A/I, the HM3 variant offers identical protection performance with halogen-free compliance, while the SMAJ20CAHE3_A/I trades 50 % pulse power and thermal robustness for smaller size - making SMB8J20CAHE3_A/I optimal for automotive and industrial applications demanding full 800 W surge handling and AEC-Q101 validation.
Availability
SMB8J20CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O conditioning, and telecom line card surge immunity requiring stable component supply and long-lifecycle support.
Supply support for SMB8J20CAHE3_A/I 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 and application-specific optimization.
The SMB8JxxCA series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, bidirectional surge suppression in automotive, industrial, and communications infrastructure where AEC-Q101 qualification and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMB8J20CAHE3_A/I at its rated peak pulse current?
The SMB8J20CAHE3_A/I exhibits a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current (IPPM) of 24.7 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees consistent overvoltage limiting during surge events - a critical parameter for safeguarding downstream 24 V-rated ICs such as CAN transceivers and analog front-ends in the SMB8J20CAHE3_A/I application circuit.
Is SMB8J20CAHE3_A/I suitable for automotive applications?
Yes, SMB8J20CAHE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix indicating RoHS-compliant, AEC-Q101–qualified construction. It meets stringent requirements for temperature cycling, high-temperature reverse bias, and surge robustness - making it appropriate for engine control units, body electronics, and ADAS sensor interfaces where the SMB8J20CAHE3_A/I must operate reliably from –40 °C to +125 °C ambient.
What does the "_A/I" suffix mean in SMB8J20CAHE3_A/I?
The "_A/I" suffix in SMB8J20CAHE3_A/I indicates packaging and reel configuration: "A" denotes the revision code per Vishay's internal documentation (Revision A of the HE3 variant), and "I" specifies 13-inch diameter plastic tape and reel packaging with a base quantity of 3200 units. This format ensures compatibility with high-speed pick-and-place equipment and supports volume manufacturing of the SMB8J20CAHE3_A/I in automotive and industrial SMT lines.
How does SMB8J20CAHE3_A/I differ from unidirectional variants like SMB10J20AHE3_A/I?
SMB8J20CAHE3_A/I is bidirectional with symmetrical clamping in both polarities, whereas SMB10J20AHE3_A/I is unidirectional and conducts only in reverse bias. The SMB8J20CAHE3_A/I has lower peak pulse power (800 W vs. 1000 W) and higher IPPM (24.7 A vs. 30.9 A) due to its dual-junction design - making it ideal for AC-coupled or differential lines like CAN or RS-485, where the SMB8J20CAHE3_A/I provides balanced protection without polarity constraints.
What PCB layout guidance applies to SMB8J20CAHE3_A/I for optimal thermal and surge performance?
For optimal performance, mount SMB8J20CAHE3_A/I on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal as specified in Vishay document 88422. This pad area minimizes thermal resistance (supporting RθJL = 20 °C/W) and maintains surge current capacity - critical because undersized pads cause premature failure during repetitive 800 W transients. Avoid thermal relief spokes; use solid copper connections to maximize heat spreading and ensure the SMB8J20CAHE3_A/I remains within its +150 °C TJ limit.
SMB8J20CAHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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_A/I FAQ
1.How can I place an order for SMB8J20CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20CAHE3_A/I 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_A/I reliable?
The price and inventory of SMB8J20CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J20CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMB8J20CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20CAHE3_A/I?
SMB8J20CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20CAHE3_A/I 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_A/I?
For technical support, including SMB8J20CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20CAHE3_A/I requirements.
6.How does Aetrix verify that SMB8J20CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J20CAHE3_A/I 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_A/I meets industry standards.
7.What is the process for return or replacement of SMB8J20CAHE3_A/I?
All SMB8J20CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20CAHE3_A/I, 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_A/I part is unused and in its original packaging.
Return procedure for SMB8J20CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J20CAHE3_A/I Tags
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