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Vishay General Semiconductor - Diodes Division SMB8J7.0CAHE3_B/H
- Part No.:
- SMB8J7.0CAHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J7.0CAHE3_B/H.pdf
- Description:
- 800W,7.0V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,890
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Product details
Overview
SMB8J7.0CAHE3_B/H 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 7.0 V stand-off voltage (VWM), 12.0 V clamping voltage (VC) at 400 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 SMB8J7.0CAHE3_B/H datasheet, SMB8J7.0CAHE3_B/H pinout, SMB8J7.0CAHE3_B/H application, or SMB8J7.0CAHE3_B/H equivalent, key selection criteria include AEC-Q101 qualification, bidirectional clamping symmetry, low clamping ratio (VC/VWM = 1.71), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional architecture enables symmetrical clamping above ±7.0 V without polarity sensitivity, supporting both AC-coupled and floating signal paths.
Thermally, it sustains 150 °C maximum junction temperature with RθJL = 20 °C/W and RθJA = 72 °C/W (on 0.2" × 0.2" pads), enabling reliable operation under repeated 8.3 ms half-sine surges up to 100 A (IFSM) and compliance with IEC 61000-4-5 Level 4 surge immunity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe signal swing margin for 5 V–7 V logic and sensor interfaces. |
| VBR min/max | 7.78 V / 8.60 V at 10 mA - Verified breakdown threshold ensures consistent turn-on across production lots and temperature range. |
| VC @ IPPM | 12.0 V at 400 A - Clamping voltage limits downstream IC stress during 800 W transient events; VC/VWM = 1.71 indicates efficient energy diversion. |
| PPPM | 800 W (10/1000 µs) - Sustains high-energy lightning-induced surges per IEC 61000-4-5; derates linearly above 25 °C ambient. |
| ID @ VWM | 1.0 µA - Ultra-low leakage preserves signal integrity in high-impedance sensor bias networks and battery-powered nodes. |
| TJ max | +150 °C - Enables under-hood automotive deployment and industrial environments with minimal thermal derating. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TC, and ESD testing per AEC standard. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminals accept either orientation in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both ends) | Transient current path | Identical terminals enable bidirectional conduction; no cathode band - simplifies layout and eliminates orientation errors during placement. |
| Case (body) | Thermal and mechanical interface | Plastic body with UL 94 V-0 rating; solderable matte tin leads meet J-STD-002 and JESD 22-B102 for reflow compatibility. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and ADAS sensor interfaces requiring long-term field reliability. |
| Low clamping ratio (VC/VWM = 1.71) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V and 5 V microcontrollers with tight absolute maximum ratings. |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow without moisture sensitivity concerns; eliminates bake preconditioning in manufacturing. |
| 800 W peak pulse power | Handles IEC 61000-4-5 combination wave surges (e.g., 2 Ω source impedance, 40 A) without degradation over >1000 cycles. |
| Glass-passivated junction | Ensures stable VBR and low leakage over temperature (-55 °C to +150 °C) and lifetime; prevents parametric drift in harsh environments. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN FD and LIN bus transceivers from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry point. Use Value: Limits transient voltage to ≤12.0 V during 400 A surges, preserving transceiver integrity without adding propagation delay. |
Use Scenario: Shielding PLC analog input channels (4–20 mA, 0–10 V) from EFT and surge coupling in factory automation. IC Role / Device Role / Timing Role: Primary front-end surge limiter on signal conditioning PCBs before op-amp buffers. Use Value: Withstands repeated 800 W transients while maintaining <1.0 µA leakage at 7.0 V - avoids DC offset errors in precision measurement. |
| Consumer USB Port Protection | Telecom Line Card Surge Suppression |
Use Scenario: Safeguarding USB 2.0 data lines (D+/D−) against ESD and cable discharge events in docking stations. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp integrated into USB connector footprint. Use Value: Clamps ±12.0 V transients within nanoseconds while adding negligible signal distortion due to symmetrical structure. |
Use Scenario: Front-end protection of xDSL or POTS line interface ICs exposed to lightning-induced surges on outside plant wiring. IC Role / Device Role / Timing Role: First-stage voltage limiter before hybrid transformer and line driver stages. Use Value: Diverts up to 400 A (10/1000 µs) while holding clamping voltage below 12.0 V - prevents latch-up in line interface ASICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J7.0CAHM3_B/H | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No difference in circuit performance or layout; selected only when halogen-free material compliance is mandated. | Choose SMB8J7.0CAHM3_B/H if environmental compliance requires halogen-free packaging - same thermal and electrical behavior. |
| SMBJ7.0CAHE3_A/H | Unidirectional version (cathode-banded) with same VWM, VC, and PPPM but asymmetric clamping (only protects negative transients). | Requires polarity-aware layout; unsuitable for AC or floating signals where bidirectional clamping is essential. | Select SMBJ7.0CAHE3_A/H only for DC-biased unidirectional lines (e.g., 5 V supply rail); SMB8J7.0CAHE3_B/H is mandatory for bidirectional signal paths. |
Compared with SMB8J7.0CAHM3_B/H, the base part offers identical surge handling but differs in halogen content; versus SMBJ7.0CAHE3_A/H, it provides true bidirectional protection essential for differential buses and AC-coupled sensors - eliminating need for dual-device solutions.
Availability
SMB8J7.0CAHE3_B/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O protection, and telecom line card designs requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMB8J7.0CAHE3_B/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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMB8J series delivers high-power-density TVS protection optimized for AEC-Q101-compliant automotive electronics and ruggedized industrial systems demanding repeatable clamping and long-term parametric stability.
FAQ
What is the clamping voltage of SMB8J7.0CAHE3_B/H at its rated peak pulse current?
The SMB8J7.0CAHE3_B/H exhibits a maximum clamping voltage (VC) of 12.0 V when subjected to its rated peak pulse current (IPPM) of 400 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and confirmed in Vishay's Document Number 88422, ensuring predictable overvoltage limiting during surge events. The SMB8J7.0CAHE3_B/H maintains this clamping performance across its full operating temperature range.
Is SMB8J7.0CAHE3_B/H suitable for automotive applications?
Yes, SMB8J7.0CAHE3_B/H is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix "HE3". It undergoes rigorous stress testing including high-temperature operating life, temperature cycling, and ESD verification - making it appropriate for engine control units, ADAS camera modules, and body electronics. The SMB8J7.0CAHE3_B/H meets MSL Level 1 for lead-free reflow and supports under-hood thermal profiles up to +150 °C junction temperature.
How does SMB8J7.0CAHE3_B/H differ from unidirectional SMBJ7.0CAHE3_A/H?
SMB8J7.0CAHE3_B/H is bidirectional with symmetrical clamping above ±7.0 V and no polarity marking, whereas SMBJ7.0CAHE3_A/H is unidirectional with a cathode band and clamps only in reverse bias. This makes SMB8J7.0CAHE3_B/H mandatory for AC-coupled, differential, or floating signal lines (e.g., CAN, USB, RS-485), while SMBJ7.0CAHE3_A/H suits DC supply rails. Both share identical VWM, VC, and PPPM ratings, but their circuit roles are not interchangeable without layout changes.
What is the maximum reverse leakage current for SMB8J7.0CAHE3_B/H at its stand-off voltage?
At its 7.0 V stand-off voltage (VWM), the SMB8J7.0CAHE3_B/H specifies a maximum reverse leakage current (ID) of 1.0 µA at 25 °C - verified per Vishay's Electrical Characteristics table for bidirectional devices. This ultra-low leakage preserves signal fidelity in high-impedance sensor circuits and battery-backed systems, and remains stable across the full -55 °C to +150 °C operating range. The SMB8J7.0CAHE3_B/H achieves this via glass-passivated junction technology.
Does SMB8J7.0CAHE3_B/H require special PCB layout considerations?
Yes - Vishay specifies mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 800 W peak pulse power and thermal performance. The SMB8J7.0CAHE3_B/H has no polarity marking, so pad symmetry is required; thermal relief should be minimized to maintain RθJL = 20 °C/W. No keep-out zone is needed beyond standard SMB (DO-214AA) footprint - 4.57 mm × 3.94 mm body with 2.20 mm cathode-band width.
SMB8J7.0CAHE3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 7V
- Current - Peak Pulse (10/1000µs):
- 66.7A
- 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)
SMB8J7.0CAHE3_B/H FAQ
1.How can I place an order for SMB8J7.0CAHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J7.0CAHE3_B/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 SMB8J7.0CAHE3_B/H reliable?
The price and inventory of SMB8J7.0CAHE3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J7.0CAHE3_B/H is usually 5 days.
3.What payment methods are accepted for SMB8J7.0CAHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J7.0CAHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J7.0CAHE3_B/H?
SMB8J7.0CAHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J7.0CAHE3_B/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 SMB8J7.0CAHE3_B/H?
For technical support, including SMB8J7.0CAHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J7.0CAHE3_B/H requirements.
6.How does Aetrix verify that SMB8J7.0CAHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMB8J7.0CAHE3_B/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 SMB8J7.0CAHE3_B/H meets industry standards.
7.What is the process for return or replacement of SMB8J7.0CAHE3_B/H?
All SMB8J7.0CAHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J7.0CAHE3_B/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 SMB8J7.0CAHE3_B/H part is unused and in its original packaging.
Return procedure for SMB8J7.0CAHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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