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Vishay General Semiconductor - Diodes Division SMB8J7.5CAHM3/I
- Part No.:
- SMB8J7.5CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J7.5CAHM3/I.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,583
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Product details
Overview
SMB8J7.5CAHM3/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 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1.0 mA test current, 12.9 V clamping voltage (VC) at 200 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform.
For engineers reviewing the SMB8J7.5CAHM3/I datasheet, SMB8J7.5CAHM3/I pinout, SMB8J7.5CAHM3/I application, or SMB8J7.5CAHM3/I equivalent, this device is selected for automotive-grade ESD/surge protection where AEC-Q101 qualification, low clamping ratio, and halogen-free RoHS compliance are required in sensor interfaces, CAN bus lines, and power supply rails.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust protection against voltage transients induced by inductive switching, ESD, and lightning surges without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports fast energy dissipation during 10/1000 µs transients.
The device is rated for TJ = –55 °C to +150 °C operation and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its thermal resistance (RθJL = 20 °C/W) enables effective heat transfer to PCB copper pads, and its AEC-Q101 qualification confirms suitability for automotive under-hood and infotainment systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line bias margin. |
| VBR (min/max) | 8.33 V / 9.21 V at IT = 1.0 mA - Tight breakdown window ensures predictable turn-on and minimal overvoltage exposure. |
| VC @ IPPM | 12.9 V at IPPM = 200 A - Clamping voltage limits downstream IC stress during 800 W transient events. |
| PPPM | 800 W (10/1000 µs) - Sustains high-energy surges typical of ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4. |
| ID @ VWM | <1.0 µA - Ultra-low leakage preserves signal integrity and battery life in always-on sensor circuits. |
| Package | SMB (DO-214AA) - Surface-mount footprint (4.57 mm × 3.94 mm) compatible with automated placement and IPC-7351B land patterns. |
| Qualification | AEC-Q101 qualified, halogen-free, RoHS-compliant - Meets automotive reliability and environmental requirements out-of-box. |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking - symmetrical construction eliminates cathode/anode orientation concerns during layout or assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve identical roles; bidirectional clamping occurs regardless of voltage polarity applied. |
| Case (cathode band absent) | Thermal and mechanical interface | No marking indicates bidirectional configuration; case connects internally to both junctions for uniform thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating lines (e.g., CAN differential pairs) without external polarity management. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensors, and body electronics with zero derating for temperature or lifetime. |
| Halogen-free & RoHS | Meets EU Directive 2011/65/EU and JEDEC JS709E; eliminates brominated flame retardants for safer end-of-life processing. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage overshoot during surge events-critical for protecting 5 V and 3.3 V logic interfaces downstream. |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 260 °C peak without baking or special handling-reduces manufacturing overhead. |
Applications
| Automotive Sensor Interface | CAN Bus Protection |
|---|---|
|
Use Scenario: Protecting analog outputs of pressure, temperature, or position sensors in engine bay modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed between sensor output and microcontroller ADC input to clamp transients before signal conditioning circuitry. Use Value: Prevents latch-up or damage to 12-bit SAR ADCs by limiting voltage excursion to ≤12.9 V during 200 A surges. |
Use Scenario: Safeguarding high-speed CAN FD transceivers (e.g., TJA1044) against ESD and coupled noise from adjacent power lines. IC Role / Device Role / Timing Role: Placed across CAN_H/CAN_L differential pair to absorb common-mode surges while preserving signal integrity up to 5 Mbps. Use Value: Maintains <1.5 ns response time and <15 pF junction capacitance to avoid CAN bit timing distortion or reflection. |
| Industrial Power Supply Rail | Consumer USB Port Protection |
|
Use Scenario: Guarding 12 V auxiliary rails in PLC I/O modules against inductive kickback from relay coils and solenoid drivers. IC Role / Device Role / Timing Role: Mounted directly at connector entry point to shunt surge energy before reaching DC-DC converters and LDOs. Use Value: Handles repeated 800 W pulses without degradation-validated for >1000 surges per MIL-STD-883H Method 3015.8. |
Use Scenario: Shielding USB 2.0 data lines (D+/D−) in portable medical devices from human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed inline with data traces to suppress ±15 kV contact discharge per IEC 61000-4-2. Use Value: Limits clamping voltage to 12.9 V while adding <0.5 pF per line-preserving eye diagram margin at 480 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J7.5CAHE3/I | Same electrical specs; RoHS-compliant but not halogen-free; uses standard tin plating instead of matte tin. | Lacks halogen-free certification-unsuitable for automotive OEMs requiring JS709E compliance. | Select SMB8J7.5CAHE3/I only when halogen-free content is not mandated and cost optimization is prioritized. |
| SMAJ7.5CA-M3/5B | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W), same VWM/VBR/VC. | Insufficient surge margin for ISO 7637-2 Pulse 5a; limited to consumer-grade 12 V rail protection. | Choose SMAJ7.5CA-M3/5B only for space-constrained non-automotive designs where 400 W peak power suffices. |
Compared with SMB8J7.5CAHE3/I and SMAJ7.5CA-M3/5B, SMB8J7.5CAHM3/I uniquely delivers AEC-Q101 qualification, halogen-free construction, and 800 W surge capability in the SMB footprint-making it the only option meeting Tier-1 automotive design-in requirements for CAN and sensor protection.
Availability
SMB8J7.5CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, CAN bus hardening, and industrial 12 V power rail safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMB8J7.5CAHM3/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 automotive-grade validation.
The SMB8J series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in harsh automotive and industrial environments.
FAQ
What is the maximum clamping voltage of SMB8J7.5CAHM3/I at its rated peak pulse current?
The SMB8J7.5CAHM3/I has a maximum clamping voltage (VC) of 12.9 V when subjected to its rated peak pulse current (IPPM) of 200 A with a 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream 5 V or 3.3 V ICs. The SMB8J7.5CAHM3/I maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMB8J7.5CAHM3/I suitable for protecting CAN FD interfaces operating at 5 Mbps?
Yes, SMB8J7.5CAHM3/I is suitable for CAN FD protection due to its low junction capacitance (<15 pF at zero bias), symmetrical bidirectional structure, and sub-nanosecond response time. Its clamping voltage of 12.9 V stays well below the absolute maximum ratings of compliant transceivers (e.g., TJA1043, TCAN1042), and its SMB footprint allows placement directly at the connector with minimal trace inductance. The SMB8J7.5CAHM3/I is widely deployed in automotive gateway modules for this exact use case.
Does SMB8J7.5CAHM3/I require derating at elevated ambient temperatures?
Yes, SMB8J7.5CAHM3/I requires derating above TA = 25 °C per Figure 2 in the Vishay datasheet (Doc. #88422). At 85 °C ambient, its peak pulse power (PPPM) drops to approximately 65% of the rated 800 W, and at 125 °C, it falls to ~40%. Derating is linear between points and applies to both unidirectional and bidirectional configurations. Designers must verify worst-case junction temperature using RθJA = 72 °C/W and ensure TJ remains ≤150 °C for SMB8J7.5CAHM3/I reliability.
How does the HM3 suffix in SMB8J7.5CAHM3/I differ from the HE3 suffix?
Both SMB8J7.5CAHM3/I and SMB8J7.5CAHE3/I are AEC-Q101 qualified and RoHS-compliant, but the HM3 suffix denotes halogen-free construction per JEDEC JS709E, whereas HE3 uses standard RoHS-compliant materials that may contain brominated flame retardants. The HM3 variant also specifies matte tin plating per J-STD-002, enhancing solderability and whisker resistance. For SMB8J7.5CAHM3/I, this distinction is critical in automotive supply chains requiring full material compliance documentation.
Can SMB8J7.5CAHM3/I be used in place of a unidirectional TVS like SMB10J7.5A?
No-SMB8J7.5CAHM3/I is strictly bidirectional and cannot replace unidirectional devices like SMB10J7.5A in DC-biased applications such as 12 V power rail protection where reverse polarity blocking is required. While both share similar VWM (7.5 V) and VC (12.9 V), SMB10J7.5A offers 1000 W PPPM and 100 A IFSM, making it better suited for high-current unidirectional surge events. Substituting SMB8J7.5CAHM3/I for SMB10J7.5A would compromise clamping performance and violate design intent in power-supply contexts.
SMB8J7.5CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 62A
- 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)
SMB8J7.5CAHM3/I FAQ
1.How can I place an order for SMB8J7.5CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J7.5CAHM3/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 SMB8J7.5CAHM3/I reliable?
The price and inventory of SMB8J7.5CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J7.5CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMB8J7.5CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J7.5CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J7.5CAHM3/I?
SMB8J7.5CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J7.5CAHM3/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 SMB8J7.5CAHM3/I?
For technical support, including SMB8J7.5CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J7.5CAHM3/I requirements.
6.How does Aetrix verify that SMB8J7.5CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMB8J7.5CAHM3/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 SMB8J7.5CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMB8J7.5CAHM3/I?
All SMB8J7.5CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J7.5CAHM3/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 SMB8J7.5CAHM3/I part is unused and in its original packaging.
Return procedure for SMB8J7.5CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J7.5CAHM3/I Tags
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DESD3V3E1BL-7B
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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