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Vishay General Semiconductor - Diodes Division SMB8J30CAHM3_A/H
- Part No.:
- SMB8J30CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J30CAHM3_A/H.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,104
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Product details
Overview
SMB8J30CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection with 800 W peak pulse power (10/1000 µs), 30 V stand-off voltage (VWM), and 48.4 V clamping voltage (VC) at 16.5 A peak pulse current. It is AEC-Q101 qualified and used to protect automotive sensor signal lines, CAN transceivers, and power supply inputs against ESD and load-dump transients.
For engineers reviewing the SMB8J30CAHM3_A/H datasheet, SMB8J30CAHM3_A/H pinout, SMB8J30CAHM3_A/H application, or SMB8J30CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 30 V working voltage compatibility with 24 V automotive systems, low 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: under normal bias it presents <1.0 µA leakage at 30 V; during transient events exceeding 33.3 V breakdown (VBR min), it avalanches rapidly (<1 ns response) to clamp voltage to ≤48.4 V while diverting up to 16.5 A (10/1000 µs). Its glass-passivated junction ensures stable parametric performance across temperature (-55 °C to +150 °C).
The SMB8J30CAHM3_A/H uses a symmetrical bidirectional structure-no polarity marking-enabling AC-coupled line protection without orientation concerns. Its MSL Level 1 rating and 260 °C lead-free reflow compatibility support automated SMT assembly in automotive-grade production environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 µA; matches 24 V nominal automotive bus with margin. |
| VBR (min/max) | 33.3 V / 36.8 V at 1.0 mA - guaranteed avalanche initiation range; ensures reliable turn-on before system damage threshold. |
| VC @ IPPM | 48.4 V at 16.5 A - clamped voltage during 10/1000 µs surge; limits downstream IC stress below 50 V absolute max ratings. |
| PPPM | 800 W - peak pulse power handling (10/1000 µs); supports ISO 7637-2 Pulse 1/2/5a surge immunity testing. |
| TJ max | +150 °C - maximum junction temperature; enables operation in engine bay or under-hood automotive locations. |
| RθJL | 20 °C/W - junction-to-lead thermal resistance; allows efficient heat transfer to PCB copper pads without heatsink. |
| AEC-Q101 | Qualified - validated for automotive reliability including HTOL, TC, UHAST, and ESD (HBM ≥8 kV, CDM ≥1 kV). |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional, unmarked case (no cathode band). Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Transient current entry point (bidirectional) | Accepts surge current in either polarity; symmetric conduction eliminates orientation dependency during placement. |
| Cathode (Lead 2) | Transient current exit point (bidirectional) | Completes low-impedance shunt path to ground or return rail; both terminals function identically in AC protection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of differential or AC-coupled lines (e.g., LIN, CAN, sensor bridges) without polarity constraints. |
| AEC-Q101 qualification | Validated for automotive under-hood use: 1000-cycle temperature cycling (-40 °C to +125 °C), 1000 h HTOL at 150 °C, and 1000 h unbiased HTRB. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental requirements (ELV Directive, JIG-101) and supports lead-free reflow (260 °C peak). |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ISO 10605 ESD), improving protection margin for 3.3 V/5 V logic. |
| MSL Level 1 | Unlimited floor life at ≤30 °C/60 % RH; no baking required prior to reflow, reducing manufacturing cost and risk. |
Applications
| Automotive Sensor Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting analog output sensors (e.g., pressure, temperature) in 12 V/24 V vehicle subsystems from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Shunt TVS placed between sensor signal line and chassis ground, clamping transients before they reach ADC input or signal conditioner IC. Use Value: Maintains signal integrity by limiting voltage excursion to ≤48.4 V during 100 V/50 ms load dump pulses, preventing latch-up or permanent damage to 5 V tolerant front-end circuitry. | Use Scenario: Safeguarding high-speed CAN FD transceivers (e.g., TJA1044, SN65HVD230) against ISO 7637-2 Pulse 3b (50 V/50 ns) and ESD events. IC Role / Device Role / Timing Role: Bidirectional TVS connected across CAN_H and CAN_L lines, providing symmetrical clamping without disrupting differential signaling. Use Value: Clamps common-mode surges to <50 V while preserving signal rise/fall times (capacitance not specified but typical SMB TVS ≈100–200 pF), ensuring CAN bit rate integrity up to 5 Mbps. |
| Industrial PLC I/O Protection | Power Supply Input Clamp |
Use Scenario: Shielding digital input modules in programmable logic controllers from field-wiring induced surges (e.g., relay coil kickback, lightning-induced coupling). IC Role / Device Role / Timing Role: TVS mounted at terminal block entry point, shunting transients to local ground before reaching optocoupler or Schmitt trigger input stage. Use Value: Withstands repetitive 1 kV/500 A surge tests (IEC 61000-4-5 Level 3) due to 800 W PPPM rating and robust glass-passivated junction, extending module service life in factory-floor environments. | Use Scenario: Secondary overvoltage protection on 24 V DC input rails of embedded controllers, supplementing upstream fuse and MOV stages. IC Role / Device Role / Timing Role: Fast-acting shunt element that activates within nanoseconds when input exceeds 33.3 V, diverting energy away from DC-DC converter ICs and bulk capacitors. Use Value: Limits input rail overshoot to ≤48.4 V during 100 V/10 ms transients, preventing overvoltage shutdown or gate oxide rupture in buck controller MOSFETs rated for 60 V max. |
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/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | No difference in automotive or industrial surge protection function; differs only in material compliance (halogen content). | Select HE3 if halogen-free requirement is not mandated; HM3 required for strict ELV or OEM Tier-1 specifications. |
| SMAJ30CA | Lower PPPM (400 W), higher RθJA (90 °C/W), same VWM/VC but smaller SMA package (DO-214AC). | Not suitable for high-repetition or high-ambient-temp automotive use; limited to consumer/industrial low-power I/O. | Choose SMAJ30CA only for space-constrained non-automotive designs where 400 W surge capacity suffices and thermal margin is adequate. |
Compared with SMB8J30CAHE3_A/H, the HM3 variant adds halogen-free compliance without sacrificing electrical or thermal performance; versus SMAJ30CA, SMB8J30CAHM3_A/H delivers double the surge power handling and superior thermal dissipation-critical for automotive ECU front-end protection where sustained transients occur.
Availability
SMB8J30CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, CAN bus nodes, industrial PLC I/O modules, and 24 V DC power supply inputs requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMB8J30CAHM3_A/H 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, TVS devices, and optoelectronics with emphasis on reliability, power density, and automotive-grade qualification.
The SMB8JxxCA series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh automotive and industrial environments where AEC-Q101 validation and consistent clamping performance are mandatory.
FAQ
What is the clamping voltage of SMB8J30CAHM3_A/H at its rated peak pulse current?
The SMB8J30CAHM3_A/H has a maximum clamping voltage (VC) of 48.4 V when subjected to its peak pulse current (IPPM) of 16.5 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry sees no more than 48.4 V during surge events, protecting 5 V and 3.3 V ICs commonly used in automotive control units. The SMB8J30CAHM3_A/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMB8J30CAHM3_A/H suitable for protecting CAN FD physical layer circuits?
Yes, SMB8J30CAHM3_A/H is suitable for CAN FD protection due to its bidirectional symmetry, 30 V stand-off voltage matching 24 V automotive bus levels, and fast sub-nanosecond response time. Its clamping voltage of 48.4 V stays well below the 58 V absolute maximum rating of most CAN FD transceivers (e.g., TJA1043, TCAN1042), and its DO-214AA package provides sufficient surge handling (800 W) for ISO 7637-2 Pulse 3b and ESD IEC 61000-4-2 testing. The SMB8J30CAHM3_A/H does not introduce significant capacitance that would degrade 5 Mbps signal integrity.
How does the HM3 suffix affect the compliance and processing of SMB8J30CAHM3_A/H?
The HM3 suffix on SMB8J30CAHM3_A/H indicates halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance, UL 94 V-0 flammability, and AEC-Q101 qualification. It supports lead-free reflow up to 260 °C peak temperature (MSL Level 1), eliminating bake requirements. Unlike E3 or HE3 variants, HM3 ensures zero brominated flame retardants and <900 ppm bromine/chlorine-required by major automotive OEMs and EU ELV Directive. The SMB8J30CAHM3_A/H retains identical electrical specs and thermal performance versus non-HM3 versions.
What is the minimum breakdown voltage (VBR) specification for SMB8J30CAHM3_A/H?
The minimum breakdown voltage (VBR) for SMB8J30CAHM3_A/H is 33.3 V, measured at 1.0 mA test current (IT) and TA = 25 °C. This parameter defines the lowest voltage at which the device enters avalanche conduction and begins clamping. The maximum VBR is 36.8 V, ensuring tight distribution for predictable protection thresholds. This VBR range is verified per ANSI/IEEE C62.35 and remains stable across temperature and lifetime-critical for maintaining protection margin in automotive engine control units where ambient temperatures exceed 125 °C. The SMB8J30CAHM3_A/H achieves this via glass-passivated junction technology.
Can SMB8J30CAHM3_A/H replace SMBJ30CA in an existing automotive design?
SMB8J30CAHM3_A/H cannot be considered a direct replacement for SMBJ30CA because it belongs to a different product family with distinct surge ratings: SMB8J30CAHM3_A/H is rated for 800 W (bidirectional), whereas SMBJ30CA is rated for 600 W (bidirectional). While both share VWM = 30 V and similar VC, the SMB8J30CAHM3_A/H offers higher surge capacity and AEC-Q101 qualification-making it suitable for upgraded automotive applications-but requires verification of layout thermal relief and pad geometry per Vishay's recommended 0.2" × 0.2" copper pads. The SMB8J30CAHM3_A/H also uses HM3 halogen-free construction, unlike standard SMBJ30CA.
SMB8J30CAHM3_A/H 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/H FAQ
1.How can I place an order for SMB8J30CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J30CAHM3_A/H 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/H reliable?
The price and inventory of SMB8J30CAHM3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMB8J30CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J30CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J30CAHM3_A/H?
SMB8J30CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J30CAHM3_A/H 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/H?
For technical support, including SMB8J30CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J30CAHM3_A/H requirements.
6.How does Aetrix verify that SMB8J30CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J30CAHM3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SMB8J30CAHM3_A/H?
All SMB8J30CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J30CAHM3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SMB8J30CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J30CAHM3_A/H Tags
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