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Vishay General Semiconductor - Diodes Division SMBJ70CAHE3_B/I
- Part No.:
- SMBJ70CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70CAHE3_B/I.pdf
- Description:
- 600W,70V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,105
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Product details
Overview
SMBJ70CAHE3_B/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features a 70 V standoff voltage (VWM), 77.8–86.0 V breakdown voltage (VBR) at 1 mA, 113 V maximum clamping voltage (VC) at 5.3 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ70CAHE3_B/I datasheet, SMBJ70CAHE3_B/I pinout, SMBJ70CAHE3_B/I application, or SMBJ70CAHE3_B/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (−55 to +150 °C), and compliance with UL 497B surge protector classification.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 70 V), then rapidly switches to low-impedance conduction when transient voltage exceeds VBR, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns).
The SMBJ70CAHE3_B/I is rated for 600 W peak pulse power (10/1000 µs), with derating above 25 °C per Fig. 2, and supports repetitive surges at 0.01 % duty cycle. Its bidirectional symmetry means identical electrical behavior in both polarities - critical for AC-coupled or floating signal line protection where polarity reversal may occur.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - guaranteed breakdown onset range; determines earliest point of clamping activation |
| VC @ IPPM | 113 V at 5.3 A - clamped voltage during 10/1000 µs surge; sets upper bound of protected circuit stress |
| PPPM | 600 W - peak transient energy handling capacity; enables robust protection against IEC 61000-4-5 Level 4 surges |
| TJ max. | +150 °C - maximum junction temperature; allows operation in high-ambient environments like motor drives or automotive ECUs |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs PCB thermal design requirements |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; suitable for under-hood applications |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - terminals are symmetrical anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (bidirectional) | Conducts surge current in either polarity; connects to protected line requiring clamping |
| Cathode | Transient current sink (bidirectional) | Identical function to Anode; forms symmetrical clamp path - no cathode band marking on SMBJ70CAHE3_B/I |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or floating nodes without polarity concerns |
| 600 W peak pulse power (10/1000 µs) | Meets IEC 61000-4-5 surge immunity requirements up to Level 4 (4 kV line-earth, 2 kV line-line) |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive electronics including engine control, body modules, and ADAS sensors |
| UL 497B recognized (QVGQ2) | Approved for use in telecom and industrial surge protection assemblies requiring safety certification |
| MSL Level 1 (260 °C reflow) | Compatible with standard lead-free SMT assembly processes without moisture sensitivity handling |
Applications
| Industrial Motor Drive Control | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensing lines against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Shunt TVS diode clamping transient spikes on 24 V DC control rails and isolated analog inputs. Use Value: Prevents latch-up or permanent damage to microcontrollers and op-amps by limiting voltage to ≤113 V during 5.3 A surges. |
Use Scenario: Safeguarding LIN bus transceivers and LED driver outputs from load dump and jump-start events. IC Role / Device Role / Timing Role: Bidirectional overvoltage clamp on 12 V supply and signal lines interfacing with external harnesses. Use Value: Maintains system uptime by absorbing 600 W surges without degradation, supported by AEC-Q101 qualification. |
| Telecom Power Interface | Consumer Sensor Hub Protection |
Use Scenario: Input-stage surge suppression on PoE-powered Ethernet switches and DSLAM line cards. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC input rails and secondary-side 3.3/5 V distribution networks. Use Value: UL 497B recognition enables inclusion in certified telecom surge protection modules meeting GR-1089-CORE. |
Use Scenario: ESD and lightning-induced transient protection for I²C/SPI lines connecting environmental sensors to MCU hosts. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical at 0 V) bidirectional clamp on high-speed digital sensor interfaces. Use Value: Preserves signal integrity while suppressing ±15 kV contact ESD (IEC 61000-4-2) and 1 kV ring wave transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA-E3/52 | Commercial-grade (non-AEC-Q101), same VWM/VBR/VC specs, identical SMB package and pinout | Lacks automotive qualification; unsuitable for under-hood or safety-critical vehicle systems | Select when cost-sensitive industrial or consumer designs do not require automotive reliability validation |
| SAC70CA | Same 70 V VWM but lower 400 W PPPM rating; smaller SOD-123FL package (lower thermal mass) | Reduced surge handling limits use to lower-energy transients; not drop-in due to different footprint and thermal performance | Choose only for space-constrained PCBs where 400 W surge margin is sufficient and AEC-Q101 is not required |
Compared with SMBJ70CA-E3/52, the SMBJ70CAHE3_B/I adds AEC-Q101 qualification and UL 497B recognition without altering electrical specs; versus SAC70CA, it delivers 50 % higher surge power and superior thermal dissipation in the larger SMB package.
Availability
SMBJ70CAHE3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power interfaces requiring stable component supply, long-term lifecycle support, and certified surge protection performance.
Supply support for SMBJ70CAHE3_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 SMBJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom applications where robustness, consistency, and safety certification are mandatory.
FAQ
What is the clamping voltage of SMBJ70CAHE3_B/I at its rated peak pulse current?
The SMBJ70CAHE3_B/I has a maximum clamping voltage (VC) of 113 V at 5.3 A peak pulse current (IPPM), measured under the standardized 10/1000 µs waveform. This value defines the highest voltage that will appear across protected circuitry during a full-rated surge event, ensuring downstream components remain within safe operating limits. The SMBJ70CAHE3_B/I maintains this clamping performance across its full operating temperature range.
Is SMBJ70CAHE3_B/I suitable for automotive applications?
Yes, SMBJ70CAHE3_B/I is AEC-Q101 qualified - verified for automotive-grade reliability including temperature cycling, high-temperature reverse bias, and ESD testing. Its HE3 suffix explicitly denotes this qualification, making it appropriate for under-hood and chassis-mounted modules such as body control units, lighting drivers, and sensor interfaces where surge immunity and long-term stability are critical. The SMBJ70CAHE3_B/I meets these requirements without derating.
How does the bidirectional design of SMBJ70CAHE3_B/I affect its circuit implementation?
The SMBJ70CAHE3_B/I has symmetrical anode/cathode terminals with no polarity marking, enabling direct placement across AC-coupled lines, differential buses (e.g., RS-485), or floating sensor outputs without orientation concerns. Unlike unidirectional TVS diodes, it clamps equally for positive and negative transients - eliminating need for dual-device configurations or polarity-aware layout. This simplifies design and reduces BOM count while maintaining full 600 W surge capability in both directions.
What is the thermal resistance and how does it impact PCB layout for SMBJ70CAHE3_B/I?
The SMBJ70CAHE3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimal copper area; increasing pad size or adding thermal vias lowers RθJA and improves sustained surge handling. For repeated surges or high ambient temperatures, PCB layout must provide adequate copper area to prevent junction temperature from exceeding +150 °C - the SMBJ70CAHE3_B/I's absolute maximum rating.
Does SMBJ70CAHE3_B/I meet any safety certifications?
Yes, SMBJ70CAHE3_B/I is Underwriters Laboratories (UL) recognized under file E136766 and standard UL 497B for surge protective devices, covering both unidirectional and bidirectional types. This certification validates its suitability in certified telecom, industrial, and building automation surge protection assemblies. The UL mark applies specifically to the HE3 variant, confirming compliance with flammability (UL 94 V-0), construction, and performance requirements defined in the standard.
SMBJ70CAHE3_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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 5.3A
- Power - Peak Pulse:
- 600W
- 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)
SMBJ70CAHE3_B/I FAQ
1.How can I place an order for SMBJ70CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70CAHE3_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 SMBJ70CAHE3_B/I reliable?
The price and inventory of SMBJ70CAHE3_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 SMBJ70CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ70CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70CAHE3_B/I?
SMBJ70CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70CAHE3_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 SMBJ70CAHE3_B/I?
For technical support, including SMBJ70CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70CAHE3_B/I requirements.
6.How does Aetrix verify that SMBJ70CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ70CAHE3_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 SMBJ70CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ70CAHE3_B/I?
All SMBJ70CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70CAHE3_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 SMBJ70CAHE3_B/I part is unused and in its original packaging.
Return procedure for SMBJ70CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70CAHE3_B/I Tags
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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