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Vishay General Semiconductor - Diodes Division SMB8J24CAHM3_B/I
- Part No.:
- SMB8J24CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J24CAHM3_B/I.pdf
- Description:
- 800W,24V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,170
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Product details
Overview
SMB8J24CAHM3_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 24 V stand-off voltage (VWM), 26.7–29.5 V breakdown voltage (VBR) at 1 mA, 38.9 V clamping voltage (VC) at 20.6 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 SMB8J24CAHM3_B/I datasheet, SMB8J24CAHM3_B/I pinout, SMB8J24CAHM3_B/I application, or SMB8J24CAHM3_B/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and thermal resistance (RθJA = 72 °C/W) for surface-mount reliability in harsh environments.
Technical Context
This device operates as a voltage-clamped avalanche diode, responding to transients within picoseconds via silicon junction avalanche breakdown. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints, and its glass-passivated chip ensures stable leakage (<1.0 µA at VWM) and repeatable clamping performance across temperature (-55 °C to +150 °C).
The SMB8J24CAHM3_B/I is rated for 800 W peak pulse power under standardized 10/1000 µs waveform conditions, with derating above 25 °C per Fig. 2. Its low incremental surge resistance and fast response time support robust immunity against ESD, lightning-induced surges, and inductive switching spikes in automotive and industrial systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 26.7 V / 29.5 V at 1 mA - guaranteed breakdown threshold range defining turn-on consistency |
| VC @ IPPM | 38.9 V at 20.6 A - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 800 W - peak transient energy absorption capacity under standard waveform |
| ID @ VWM | ≤1.0 µA - ultra-low leakage preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - extended junction temperature rating supports under-hood and industrial ambient operation |
| RθJA | 72 °C/W - thermal resistance from junction to ambient on standard 5.0 mm × 5.0 mm copper pads |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; bidirectional clamping occurs regardless of voltage polarity |
| Case (body) | Thermal and mechanical interface | Plastic molding meets UL 94 V-0; provides mechanical anchoring and heat spreading to PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for modern automotive and industrial manufacturing |
| MSL Level 1 (260 °C peak) | Enables standard lead-free reflow without preconditioning or baking delays |
| Glass-passivated junction | Ensures stable electrical parameters and long-term reliability under thermal and humidity stress |
| Low profile SMB package | 0.130–0.155 inch height enables compact layout in space-constrained modules and ECUs |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in engine control units. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry point to shunt surge energy before reaching signal conditioning ICs. Use Value: Maintains signal fidelity below 38.9 V clamp while surviving 800 W transients - critical for AEC-Q100-compliant microcontroller input protection. | Use Scenario: Safeguarding RS-485, 4–20 mA loop, or digital GPIO lines in PLC backplanes exposed to field wiring surges and ground potential differences. IC Role / Device Role / Timing Role: Standoff-and-clamp protector between field-side connector and isolated signal transceiver, operating continuously at 24 V DC supply rails. Use Value: Enables >100,000 surge cycles at rated IPPM due to low RθJL (20 °C/W), reducing field failure rates in factory automation equipment. |
| Consumer Power Adapter Input | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side overvoltage suppression on 24 V DC input rails of smart home hubs and PoE-powered devices subjected to accidental AC mains coupling. IC Role / Device Role / Timing Role: Fast-response clamping diode placed after primary DC/DC converter output filter to absorb residual transients escaping upstream filtering. Use Value: 1.0 µA leakage at 24 V prevents measurable standby current increase - essential for Energy Star and EU CoC Tier 2 compliance. | Use Scenario: Primary-level surge protection on Ethernet PHY power and data lines in telecom access equipment deployed in outdoor cabinets. IC Role / Device Role / Timing Role: Bidirectional transient suppressor bridging VDDIO and GND near RJ45 magnetics to clamp common-mode surges induced by nearby lightning strikes. Use Value: Symmetrical clamping eliminates need for dual unidirectional devices, simplifying BOM and layout while meeting ITU-T K.21 basic protection level. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J24CAHE3_B/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial/industrial use only; not approved for automotive production | Select when halogen-free requirement or automotive qualification is not mandated |
| SMAJ24CA-M3/5B | Lower PPPM (400 W); SMA package (smaller footprint, higher RθJA ≈ 95 °C/W); same VWM/VBR/VC | Limited to lower-energy transients; less thermal margin in sustained surge events | Choose for cost-sensitive, space-constrained designs where 800 W rating is unnecessary |
Compared with SMB8J24CAHM3_B/I, the HE3 variant trades halogen-free content and automotive qualification for lower cost, while the SMAJ24CA-M3/5B reduces surge handling and thermal performance to fit smaller PCB footprints - making SMB8J24CAHM3_B/I optimal for AEC-Q101-compliant, high-reliability 24 V system protection.
Availability
SMB8J24CAHM3_B/I is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, and telecom infrastructure requiring stable component supply with full traceability and lifecycle management.
Supply support for SMB8J24CAHM3_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, rectifiers, MOSFETs, and protection devices 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, surface-mount transient suppression in automotive and industrial environments demanding AEC-Q101 validation and robust surge immunity.
FAQ
What is the clamping voltage of SMB8J24CAHM3_B/I at its rated peak pulse current?
The SMB8J24CAHM3_B/I has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current (IPPM) of 20.6 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream circuitry remains below safe voltage thresholds during surge events. The SMB8J24CAHM3_B/I maintains this clamping performance across its full operating temperature range.
Is SMB8J24CAHM3_B/I suitable for automotive applications?
Yes, SMB8J24CAHM3_B/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials - explicitly designated for automotive use via the "HM3" suffix and "_B/I" tape-and-reel packaging. It meets stringent requirements for temperature cycling, mechanical shock, and humidity bias, making SMB8J24CAHM3_B/I appropriate for engine control, body electronics, and ADAS sensor protection.
What does the "HM3" suffix indicate in SMB8J24CAHM3_B/I?
The "HM3" suffix in SMB8J24CAHM3_B/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade "E3" or "M3" versions and confirms compliance with automotive material standards and reliability testing. The SMB8J24CAHM3_B/I ordering code guarantees full traceability and process control aligned with IATF 16949 requirements.
How does SMB8J24CAHM3_B/I differ from unidirectional variants like SMB10J24A?
SMB8J24CAHM3_B/I is bidirectional with symmetric clamping behavior and no cathode marking, whereas SMB10J24A is unidirectional, features a cathode band, and offers higher peak pulse power (1000 W vs. 800 W). The SMB8J24CAHM3_B/I supports AC or differential signal protection without polarity concerns, while SMB10J24A suits DC-biased lines where forward conduction must be blocked.
What PCB pad layout is recommended for optimal thermal performance of SMB8J24CAHM3_B/I?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad area per terminal for SMB8J24CAHM3_B/I to achieve the published RθJA of 72 °C/W. Thermal vias under pads and internal copper planes further reduce junction temperature rise during repetitive surges. Deviating from this layout increases thermal resistance and may compromise SMB8J24CAHM3_B/I's 800 W surge rating in sustained operation.
SMB8J24CAHM3_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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 24V
- Current - Peak Pulse (10/1000µs):
- 20.6A
- 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)
SMB8J24CAHM3_B/I FAQ
1.How can I place an order for SMB8J24CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J24CAHM3_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 SMB8J24CAHM3_B/I reliable?
The price and inventory of SMB8J24CAHM3_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 SMB8J24CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMB8J24CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J24CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J24CAHM3_B/I?
SMB8J24CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J24CAHM3_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 SMB8J24CAHM3_B/I?
For technical support, including SMB8J24CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J24CAHM3_B/I requirements.
6.How does Aetrix verify that SMB8J24CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMB8J24CAHM3_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 SMB8J24CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMB8J24CAHM3_B/I?
All SMB8J24CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J24CAHM3_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 SMB8J24CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMB8J24CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J24CAHM3_B/I Tags
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