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Vishay General Semiconductor - Diodes Division SMB8J20CAHE3_B/I
- Part No.:
- SMB8J20CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20CAHE3_B/I.pdf
- Description:
- 800W,20V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,875
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Product details
Overview
SMB8J20CAHE3_B/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 - optimized for automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J20CAHE3_B/I datasheet, SMB8J20CAHE3_B/I pinout, SMB8J20CAHE3_B/I application, or SMB8J20CAHE3_B/I equivalent, this AEC-Q101 qualified TVS delivers verified bidirectional clamping performance, low leakage (<1 µA at 20 V), and MSL Level 1 moisture sensitivity - critical for under-hood automotive modules and high-reliability industrial controllers.
Technical Context
This device operates as a voltage-clamped crowbar during transients: its silicon avalanche junction breaks down symmetrically above ±22.2 V (min VBR) to shunt surge energy away from downstream ICs. It sustains 24.7 A peak pulse current (10/1000 µs) while limiting voltage to ≤32.4 V across the protected node.
Thermally, it exhibits RθJL = 20 °C/W junction-to-lead resistance and RθJA = 72 °C/W junction-to-ambient (on 5.0 mm × 5.0 mm copper pads), enabling reliable operation up to TJ = +150 °C. Its glass-passivated chip junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range for protected line |
| VBR (min/max) | 22.2 V / 24.5 V - guaranteed breakdown threshold range at 1 mA test current; ensures consistent turn-on across temperature and lot |
| VC @ IPPM | 32.4 V at 24.7 A - clamping voltage under full-rated 10/1000 µs surge; determines maximum overvoltage seen by downstream circuitry |
| PPPM | 800 W - peak pulse power handling capability; enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges |
| ID @ VWM | <1 µA - reverse leakage at rated stand-off voltage; minimizes quiescent power loss and avoids false triggering in high-impedance circuits |
| TJ max. | +150 °C - maximum junction temperature rating; supports placement near heat sources in automotive engine control units |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22-A114 |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminal configuration with cathode/anode interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals conduct equally during positive or negative surges; no orientation required during placement |
| Case (body) | Thermal and mechanical interface | Plastic body transfers heat to PCB copper pads; requires 5.0 mm × 5.0 mm minimum pad area per terminal for rated power dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled and differential signal lines (e.g., CAN, LIN, RS-485) without polarity constraints |
| AEC-Q101 qualification | Validated for automotive under-hood environments including thermal shock, humidity, and lifetime surge endurance |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage margin between breakdown and clamping - improves system-level immunity without overdesign |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles; no pre-baking required prior to assembly |
| Glass-passivated junction | Ensures stable VBR over time and temperature; eliminates parameter drift due to surface contamination or humidity |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting analog/digital sensor outputs (e.g., pressure, temperature) in engine control modules exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to divert surge energy before reaching MCU ADC or GPIO pins. Use Value: Limits transient voltage to ≤32.4 V during 800 W surges, preserving sensor signal integrity and preventing MCU latch-up or damage. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V DC field wiring subject to lightning-induced surges and relay contact bounce. IC Role / Device Role / Timing Role: Primary surge suppression element mounted adjacent to terminal block, absorbing energy before optocoupler or level-shifter inputs. Use Value: Withstands ≥24.7 A peak current (10/1000 µs), enabling compliance with IEC 61000-4-5 Level 3 (2 kV/12 Ω) without additional stages. |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
Use Scenario: Securing LIN bus transceiver pins in door module ECUs where cable harnesses act as antennas for ESD and RF coupling. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF at 0 V) bidirectional TVS placed inline with LIN data line to suppress fast transients without distorting 19.2 kbps signaling. Use Value: Clamps ESD events (±8 kV contact) within nanoseconds while adding negligible signal distortion - maintains bus timing margins. |
Use Scenario: Shielding microcontroller GPIOs driving brushed DC motors in smart home appliances subjected to commutation spikes. IC Role / Device Role / Timing Role: Secondary protection stage after bulk filtering, clamping flyback voltages induced by motor coil de-energization. Use Value: Handles repetitive 100 A IFSM surges (8.3 ms half-sine) without degradation - extends product lifetime in high-cycle motor applications. |
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_A/H | Same VWM (20 V), VC (32.4 V), and PPPM (800 W); differs only in revision code (A vs. B) and tape/reel packaging (750 vs. 3200 units) | Identical electrical and thermal performance; suitable for same PCB layout and qualification testing | Select when smaller reel size or earlier revision is preferred for legacy BOM alignment |
| SMCJ20CAHE3/5B | Higher PPPM (1500 W), larger SMC (DO-214AB) package, same VWM/VC specs; RθJA = 35 °C/W vs. 72 °C/W | Supports higher surge duty cycles or elevated ambient temperatures; requires larger PCB footprint | Choose for applications needing >800 W margin or extended thermal headroom, accepting increased board area |
Compared with SMB8J20CAHE3_B/I, SMBJ20CAHE3_A/H offers identical protection performance in a functionally interchangeable form factor, while SMCJ20CAHE3/5B trades compactness for higher power handling and lower thermal resistance - guiding selection based on surge duty cycle and layout constraints.
Availability
SMB8J20CAHE3_B/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, and body control module designs requiring stable component supply and AEC-Q101 compliance.
Supply support for SMB8J20CAHE3_B/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and power efficiency.
The SMB8J series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in automotive and industrial systems where space and thermal constraints are critical.
FAQ
What is the clamping voltage of SMB8J20CAHE3_B/I under maximum rated surge current?
The SMB8J20CAHE3_B/I clamps to a maximum of 32.4 V when subjected to its rated peak pulse current of 24.7 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and confirmed across production lots - ensuring predictable overvoltage limiting for protected ICs in automotive and industrial applications.
Is SMB8J20CAHE3_B/I suitable for bidirectional signal lines like CAN or LIN buses?
Yes, SMB8J20CAHE3_B/I is explicitly designed as a bidirectional TVS diode with symmetrical breakdown behavior, making it appropriate for protecting differential or AC-coupled signal lines such as CAN FD, LIN, and RS-485. Its low clamping ratio and sub-100 pF junction capacitance preserve signal integrity at typical automotive bus speeds.
Does SMB8J20CAHE3_B/I require specific PCB layout considerations for thermal performance?
Yes - to achieve rated 800 W peak pulse power and maintain TJ ≤ 150 °C, SMB8J20CAHE3_B/I must be mounted on minimum 5.0 mm × 5.0 mm copper pads per terminal, per Vishay's recommended land pattern. Reduced pad area increases RθJA and risks thermal runaway during repetitive surges.
How does the HE3 suffix in SMB8J20CAHE3_B/I affect its qualification status?
The HE3 suffix denotes RoHS-compliant construction with AEC-Q101 qualification - confirming that SMB8J20CAHE3_B/I has passed automotive-grade stress tests including temperature cycling, high-temperature reverse bias, and ESD. This distinguishes it from commercial-grade E3 variants lacking automotive validation.
Can SMB8J20CAHE3_B/I replace unidirectional TVS diodes in existing designs?
No - SMB8J20CAHE3_B/I is strictly bidirectional and lacks polarity marking; substituting it for a unidirectional part (e.g., SMBJ20AHE3_B/I) would compromise protection on DC-biased lines. Unidirectional variants provide forward conduction path and lower VF - essential for certain power rail clamp configurations.
SMB8J20CAHE3_B/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 20V
- Current - Peak Pulse (10/1000µs):
- 24.7A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- Telecom
- 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_B/I FAQ
1.How can I place an order for SMB8J20CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20CAHE3_B/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_B/I reliable?
The price and inventory of SMB8J20CAHE3_B/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_B/I is usually 5 days.
3.What payment methods are accepted for SMB8J20CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20CAHE3_B/I?
SMB8J20CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20CAHE3_B/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_B/I?
For technical support, including SMB8J20CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20CAHE3_B/I requirements.
6.How does Aetrix verify that SMB8J20CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMB8J20CAHE3_B/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_B/I meets industry standards.
7.What is the process for return or replacement of SMB8J20CAHE3_B/I?
All SMB8J20CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20CAHE3_B/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_B/I part is unused and in its original packaging.
Return procedure for SMB8J20CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J20CAHE3_B/I Tags
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Toshiba Semiconductor and Storage
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