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Vishay General Semiconductor - Diodes Division SMB8J20CAHM3_B/I
- Part No.:
- SMB8J20CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20CAHM3_B/I.pdf
- Description:
- 800W,20V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,597
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Product details
Overview
SMB8J20CAHM3_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 power and signal lines. It features a 20 V stand-off voltage (VWM), 32.4 V clamping voltage (VC) at 24.7 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - used to safeguard automotive sensor interfaces, industrial I/O ports, and DC power rails against ESD and load dump transients.
For engineers reviewing the SMB8J20CAHM3_B/I datasheet, SMB8J20CAHM3_B/I pinout, SMB8J20CAHM3_B/I application, or SMB8J20CAHM3_B/I equivalent, key selection criteria include its AEC-Q101 qualification, bidirectional polarity, low clamping ratio (VC/VWM = 1.62), and halogen-free RoHS-compliant construction - critical for automotive-grade reliability and thermal robustness in harsh environments.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 20 V), then rapidly avalanches below 24.5 V breakdown (VBR min) to divert surge energy away from downstream ICs. Its glass-passivated junction ensures stable performance across -55 °C to +150 °C operating range and supports automated SMT placement per J-STD-020 MSL level 1.
The SMB8J20CAHM3_B/I delivers 800 W peak pulse power handling with low incremental surge resistance, enabling effective suppression of 10/1000 µs transients up to 24.7 A without thermal runaway. Its bidirectional configuration protects AC-coupled or floating lines - unlike unidirectional variants - and meets ANSI/IEEE C62.35 standards for transient suppression devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 22.2 V / 24.5 V at 1 mA - precise breakdown threshold ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 32.4 V at 24.7 A - clamping voltage limits stress on protected circuitry during 800 W surge events. |
| PPPM | 800 W - peak pulse power rating with 10/1000 µs waveform; enables robust protection against ISO 7637-2 Pulse 1/2/5a. |
| ID @ VWM | 1.0 µA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss. |
| TJ max | +150 °C - extended junction temperature rating supports under-hood automotive and industrial ambient conditions. |
| Package | SMB (DO-214AA) - surface-mount footprint (4.57 mm × 3.94 mm) compatible with standard reflow profiles and automated assembly. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL level 1, 260 °C peak reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Band End) | Anode connection for reverse-biased operation | Bidirectional symmetry means no functional polarity; band denotes terminal 1 per DO-214AA standard - both terminals behave identically in AC protection. |
| Anode (Opposite Band) | Cathode connection for reverse-biased operation | Identical electrical behavior to terminal 1; enables symmetrical clamping on differential or floating lines without orientation dependency. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets automotive environmental compliance requirements and supports lead-free reflow soldering. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes voltage overshoot during surges, reducing risk of latch-up or damage to 3.3 V/5 V/12 V logic and analog ICs. |
| Fast response time (<1 ps) | Clamps transients before they propagate into sensitive circuitry - critical for protecting high-speed CAN, LIN, and sensor signal paths. |
| High surge current capability (24.7 A) | Withstands repeated 10/1000 µs pulses per ISO 16750-2, supporting long-term reliability in industrial motor drives and power supplies. |
Applications
| Automotive Sensor Protection | Industrial DC Power Rail Protection |
|---|---|
|
Use Scenario: Protecting CAN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point to clamp fast-rising transients before reaching PHY layer. Use Value: Prevents communication errors and permanent damage by limiting voltage to ≤32.4 V during 24.7 A surges - within safe operating area of 5 V tolerant CAN transceivers. |
Use Scenario: Safeguarding 24 V input rails of PLC I/O modules and motor drive controllers against switching transients and lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end TVS device mounted adjacent to bulk input capacitor to absorb high-energy 10/1000 µs pulses. Use Value: Enables sustained operation under ISO 7637-2 Pulse 5a (load dump) with 800 W dissipation - eliminating need for secondary crowbar circuits. |
| Telecom Line Interface Protection | Consumer Device USB/DC Jack Protection |
|
Use Scenario: Shielding RS-485/RS-232 data lines in base station backhaul equipment from induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional clamping element across differential pair to suppress common-mode transients without disrupting signal integrity. Use Value: Maintains <1 pF junction capacitance at zero bias (per family spec), preserving signal rise/fall times up to 10 Mbps without distortion. |
Use Scenario: Guarding 5 V/12 V DC input jacks and USB VBUS lines in smart home hubs and portable chargers against user-induced ESD and hot-plug spikes. IC Role / Device Role / Timing Role: First-line defense component placed immediately after connector to shunt >8 kV HBM ESD events per IEC 61000-4-2. Use Value: Achieves <1 µA leakage at 20 V, preventing battery drain in always-on devices while delivering sub-1 ns response to 15 kV air discharge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J20CAHE3_B/I | Same electrical specs, but RoHS-compliant commercial grade (not halogen-free); lacks AEC-Q101 qualification. | Suitable for non-automotive industrial or consumer use where halogen-free requirement is not mandated. | Select when cost sensitivity outweighs automotive qualification or halogen-free compliance needs. |
| SMAJ20CA | Same VWM/VC/IPPM ratings but in smaller SMA (DO-214AC) package; 600 W PPPM (vs. 800 W); RθJA = 85 °C/W (vs. 72 °C/W). | Limited to lower-power or space-constrained designs where thermal derating above 85 °C is acceptable. | Choose only if PCB real estate is critical and peak surge energy remains ≤600 W - verify thermal margin with layout. |
Compared with SMB8J20CAHE3_B/I, the SMB8J20CAHM3_B/I adds halogen-free compliance and AEC-Q101 validation for automotive deployment; versus SMAJ20CA, it provides 33 % higher surge power handling and superior thermal resistance - essential for high-reliability 24 V system protection.
Availability
SMB8J20CAHM3_B/I is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply with full traceability and lifecycle management.
Supply support for SMB8J20CAHM3_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 high-performance applications.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-energy transient suppression in automotive, industrial, and communications systems where AEC-Q101 compliance and robust surge immunity are mandatory.
FAQ
What is the clamping voltage of SMB8J20CAHM3_B/I at its rated peak pulse current?
The SMB8J20CAHM3_B/I has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current (IPPM) of 24.7 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures protected circuits remain within safe voltage limits during surge events - critical for safeguarding 24 V system components such as microcontrollers and interface ICs.
Is SMB8J20CAHM3_B/I suitable for automotive applications?
Yes, SMB8J20CAHM3_B/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction - making it approved for automotive use in engine control units, body electronics, and ADAS sensor modules. Its -55 °C to +150 °C operating range and validated surge performance per ISO 7637-2 further confirm suitability for under-hood and chassis-mounted deployments.
How does the bidirectional configuration of SMB8J20CAHM3_B/I affect its circuit placement?
The SMB8J20CAHM3_B/I is symmetrically bidirectional, meaning either terminal can serve as anode or cathode - no polarity marking is required for function, though the cathode band follows DO-214AA convention. This allows flexible placement across AC-coupled lines, differential buses (e.g., RS-485), or floating power domains without orientation constraints, simplifying layout and reducing BOM complexity.
What is the maximum reverse leakage current of SMB8J20CAHM3_B/I at its stand-off voltage?
At its 20 V stand-off voltage (VWM), the SMB8J20CAHM3_B/I exhibits a maximum reverse leakage current (ID) of 1.0 µA at 25 °C. This ultra-low leakage preserves signal fidelity in high-impedance sensor interfaces and minimizes quiescent power loss in battery-powered systems - verified per Vishay's published electrical characteristics table for SMB8J20CA.
Does SMB8J20CAHM3_B/I require special PCB layout considerations for thermal performance?
Yes - to achieve its rated 800 W peak pulse power, SMB8J20CAHM3_B/I must be mounted on minimum recommended copper pads: 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal, per Vishay's thermal characterization. Insufficient copper area increases junction temperature rise and reduces surge survivability; thermal resistance drops from 72 °C/W (typical) to ~40 °C/W with optimized layout, directly impacting reliability under repetitive surge conditions.
SMB8J20CAHM3_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)
SMB8J20CAHM3_B/I FAQ
1.How can I place an order for SMB8J20CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20CAHM3_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 SMB8J20CAHM3_B/I reliable?
The price and inventory of SMB8J20CAHM3_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 SMB8J20CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMB8J20CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20CAHM3_B/I?
SMB8J20CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20CAHM3_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 SMB8J20CAHM3_B/I?
For technical support, including SMB8J20CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20CAHM3_B/I requirements.
6.How does Aetrix verify that SMB8J20CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMB8J20CAHM3_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 SMB8J20CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMB8J20CAHM3_B/I?
All SMB8J20CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20CAHM3_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 SMB8J20CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMB8J20CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J20CAHM3_B/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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