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Vishay General Semiconductor - Diodes Division SMB8J30CAHM3_A/I
- Part No.:
- SMB8J30CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J30CAHM3_A/I.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J30CAHM3_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 30 V stand-off voltage (VWM), 48.4 V maximum clamping voltage (VC) at 16.5 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 SMB8J30CAHM3_A/I datasheet, SMB8J30CAHM3_A/I pinout, SMB8J30CAHM3_A/I application, or SMB8J30CAHM3_A/I equivalent, key selection criteria include bidirectional clamping performance under ISO 7637-2/IEC 61000-4-5 transients, AEC-Q101 qualification status, thermal resistance (RθJL = 20 °C/W), and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This device operates as a voltage-clamped shunt protector: during transient overvoltage events exceeding its breakdown voltage (VBR = 33.3–36.8 V), it avalanches to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1 ns), critical for safeguarding CAN, LIN, and analog sensor inputs.
Rated for -55 °C to +150 °C junction temperature and qualified to AEC-Q101, SMB8J30CAHM3_A/I supports automotive-grade reliability. The SMB package provides low thermal resistance (RθJA = 72 °C/W) when mounted on 5.0 mm × 5.0 mm copper pads, enabling robust power dissipation without heatsinking in space-constrained ECUs and body control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V automotive systems. |
| VBR min/max | 33.3 V / 36.8 V - breakdown occurs within this range at 1.0 mA test current; ensures predictable turn-on across temperature and lot variation. |
| VC @ IPPM | 48.4 V - clamping voltage measured at 16.5 A peak pulse current (10/1000 μs); limits stress on protected ICs such as microcontrollers or transceivers. |
| PPPM | 800 W - peak pulse power handling capability; sustains defined surge energy without failure per IEC 61000-4-5 Level 4 (4 kV) |
| ID @ VWM | ≤1.0 μA - ultra-low reverse leakage at rated stand-off voltage; preserves signal integrity and battery life in always-on circuits. |
| TJ max | +150 °C - maximum junction temperature rating; enables operation in under-hood environments and high-power-density PCB layouts. |
| AEC-Q101 | Qualified - validated for automotive use including temperature cycling, HTRB, and ESD testing; required for ASIL-B compatible subsystems. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking (unlike unidirectional variants which feature cathode band). Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated for J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (during positive half-cycle) | Connects to line being protected; forms symmetrical conduction path with cathode for bidirectional clamping. |
| Cathode | Transient current entry point (during negative half-cycle) | Completes bidirectional path; both terminals function identically - no fixed polarity required in layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or differential lines (e.g., CAN H/L, RS-485) without requiring external polarity management. |
| AEC-Q101 qualification | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and JEDEC JESD201 Class 2 whisker resistance for long-term reliability. |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = 1.45) versus standard TVS diodes, reducing voltage overshoot on protected nodes. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Sensor Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12 V/24 V analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in powertrain modules. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between sensor output line and ground, activated only during overvoltage events. Use Value: Limits clamped voltage to ≤48.4 V, preventing damage to 5 V or 3.3 V ADC inputs while maintaining <1.0 μA leakage at 30 V nominal rail. |
Use Scenario: Guarding CAN H and CAN L differential pair against ESD (IEC 61000-4-2) and burst noise (IEC 61000-4-4) in vehicle networking gateways. IC Role / Device Role / Timing Role: Bidirectional TVS connected line-to-line and line-to-ground to clamp common-mode and differential surges simultaneously. Use Value: Symmetrical clamping ensures equal protection on both bus lines without skew; 800 W PPPM handles ISO 11898-2 specified transients. |
| Industrial PLC I/O Protection | Telecom Power Interface |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Primary front-end protection device mounted directly at connector entry point, preceding optocoupler or Schmitt trigger input stage. Use Value: Withstands 16.5 A peak surge current (10/1000 μs), enabling robust immunity to 2 kV surge tests per IEC 61000-4-5. |
Use Scenario: Protecting 48 V PoE-powered Ethernet ports (IEEE 802.3af/at) from lightning-induced surges entering via data lines or auxiliary power feeds. IC Role / Device Role / Timing Role: Secondary-level TVS used in conjunction with gas discharge tubes (GDTs) to provide low-clamping follow-on protection after primary crowbar action. Use Value: 30 V VWM aligns with PoE midspan voltage tolerances; 48.4 V VC prevents latch-up in PHY transceivers rated for 50 V absolute maximum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J30CAHE3_A/I | Same electrical specs, but RoHS-compliant commercial grade (not AEC-Q101 qualified); uses standard tin plating instead of halogen-free formulation. | Limited to non-automotive industrial or consumer applications where automotive qualification is not mandated. | Select HE3 version if AEC-Q101 is unnecessary and cost sensitivity outweighs halogen-free requirement. |
| SMAJ30CA | Lower PPPM (400 W vs. 800 W); same VWM/VBR/VC specs; SMA package (smaller footprint, higher RθJA = 95 °C/W). | Suitable for lower-energy transients or space-constrained designs where thermal derating is acceptable. | Choose SMAJ30CA only when surge threat level is ≤2 kV and board area is severely limited - not a drop-in replacement due to reduced power rating. |
Compared with SMB8J30CAHE3_A/I, SMB8J30CAHM3_A/I adds AEC-Q101 validation and halogen-free construction for automotive deployment; versus SMAJ30CA, it delivers double the surge power handling and superior thermal performance in the larger SMB package - critical for sustained transient immunity in harsh environments.
Availability
SMB8J30CAHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and telecom infrastructure requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMB8J30CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, bidirectional surge protection in automotive and industrial environments where AEC-Q101 compliance and low clamping voltage are mandatory.
FAQ
What is the clamping voltage of SMB8J30CAHM3_A/I at its rated peak pulse current?
The SMB8J30CAHM3_A/I has a maximum clamping voltage (VC) of 48.4 V when subjected to its rated peak pulse current (IPPM) of 16.5 A using the 10/1000 μs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and ensures downstream ICs see limited overvoltage stress during surge events. The SMB8J30CAHM3_A/I maintains this clamping performance across its qualified temperature range (-55 °C to +150 °C).
Is SMB8J30CAHM3_A/I suitable for automotive applications?
Yes, SMB8J30CAHM3_A/I is AEC-Q101 qualified and explicitly designated for automotive use, with suffix "HM3" indicating halogen-free, RoHS-compliant, and automotive-grade construction. It meets requirements for engine control units, body electronics, and ADAS sensor modules where reliability under thermal cycling, humidity, and high-energy transients is essential. The SMB8J30CAHM3_A/I datasheet confirms qualification per AEC-Q101 test conditions including HTGB, H3TRB, and mechanical shock.
How does the HM3 suffix differ from HE3 in SMB8J30CAHM3_A/I?
The HM3 suffix in SMB8J30CAHM3_A/I denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction, whereas HE3 indicates RoHS-compliant and AEC-Q101-qualified but not halogen-free. Both meet JESD201 Class 2 whisker resistance, but HM3 satisfies stricter environmental mandates (e.g., EU ELV, China RoHS II) requiring absence of brominated flame retardants. The SMB8J30CAHM3_A/I is therefore preferred for Tier 1 automotive supply chains with halogen-free material declarations.
What is the thermal resistance of SMB8J30CAHM3_A/I from junction to lead?
The SMB8J30CAHM3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, measured under standard mounting conditions. This low value enables efficient heat transfer from the silicon die to the PCB copper pads through the leads, supporting reliable operation at elevated ambient temperatures. When combined with the SMB package's 5.0 mm × 5.0 mm recommended pad layout, the SMB8J30CAHM3_A/I achieves effective thermal management without additional heatsinking in most automotive and industrial deployments.
Can SMB8J30CAHM3_A/I be used in bidirectional signal lines like RS-485 or CAN?
Yes, SMB8J30CAHM3_A/I is a bidirectional TVS diode with symmetrical breakdown characteristics (VBR = 33.3–36.8 V in both directions), making it ideal for protecting differential or AC-coupled signal lines including CAN, LIN, RS-485, and USB data pairs. Its lack of polarity marking simplifies PCB layout, and its 48.4 V clamping voltage ensures compatibility with 3.3 V/5 V transceivers while surviving repetitive 1 kV EFT bursts per IEC 61000-4-4. The SMB8J30CAHM3_A/I is commonly deployed in line-to-line and line-to-ground configurations for full-duplex interface protection.
SMB8J30CAHM3_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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 16.5A
- 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)
SMB8J30CAHM3_A/I FAQ
1.How can I place an order for SMB8J30CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J30CAHM3_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 SMB8J30CAHM3_A/I reliable?
The price and inventory of SMB8J30CAHM3_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 SMB8J30CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMB8J30CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J30CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J30CAHM3_A/I?
SMB8J30CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J30CAHM3_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 SMB8J30CAHM3_A/I?
For technical support, including SMB8J30CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J30CAHM3_A/I requirements.
6.How does Aetrix verify that SMB8J30CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J30CAHM3_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 SMB8J30CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMB8J30CAHM3_A/I?
All SMB8J30CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J30CAHM3_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 SMB8J30CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMB8J30CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J30CAHM3_A/I Tags
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ESD9B5.0ST5G
onsemi
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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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onsemi
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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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