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Vishay General Semiconductor - Diodes Division SMBJ70CAHM3/I
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- Part No.:
- SMBJ70CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70CAHM3/I.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,872
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Product details
Overview
SMBJ70CAHM3/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 power and signal 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, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and telecom line cards.
For engineers reviewing the SMBJ70CAHM3/I datasheet, SMBJ70CAHM3/I pinout, SMBJ70CAHM3/I application, or SMBJ70CAHM3/I equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification status, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VC, and IPPM specifications in forward and reverse directions. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ns), enabling protection against ESD, lightning-induced surges, and inductive switching transients.
The device is rated for TJ = –55 °C to +150 °C operation, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and uses matte tin-plated leads solderable per J-STD-002 and JESD22-B102 - supporting automated SMT placement without lead finish concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - Confirmed bidirectional breakdown range; ensures reliable turn-on during overvoltage events. |
| VC @ IPPM | 113 V at 5.3 A - Clamped voltage under 10/1000 µs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 600 W - Peak pulse power handling capability; supports repetitive surge duty cycle of 0.01 %. |
| ID @ VWM | <1.0 µA - Ultra-low reverse leakage at standoff voltage; minimizes standby power loss in high-impedance circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables use in thermally constrained industrial and automotive environments. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs board-level thermal design. |
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 (Terminal 1) | Input/Output terminal | One side of bidirectional clamping path; connects to protected line (e.g., RS-485 bus or DC rail). |
| Cathode (Terminal 2) | Input/Output terminal | Other side of bidirectional clamping path; ties to same protected line - forms symmetric voltage clamp across terminals. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 600 W peak pulse power | Handles high-energy transients like IEC 61000-4-5 Level 4 (4 kV surge) when properly mounted on 5 mm × 5 mm copper pads. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness - suitable for under-hood ECUs. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for industrial and consumer electronics with no brominated flame retardants. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies manufacturing logistics. |
Applications
| Industrial Power Supply Protection | Automotive Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V DC input rails in PLC modules against load dump and relay coil flyback. IC Role / Device Role / Timing Role: Bidirectional TVS clamps positive and negative transients to limit rail voltage excursion within safe limits of downstream regulators and controllers. Use Value: Prevents latch-up or permanent damage to 24 V-rated DC/DC converters and microcontrollers during field-deployed operation. | Use Scenario: Shielding LIN bus or analog sensor inputs (e.g., pressure, temperature) in engine control units from coupled noise and battery transients. IC Role / Device Role / Timing Role: Fast-response voltage clamp absorbs sub-100 ns ESD pulses and low-energy spikes without distorting signal integrity. Use Value: Maintains sensor accuracy and communication reliability while meeting ISO 10605 and ISO 7637-2 immunity requirements. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding Ethernet PHY or PoE interface circuitry from lightning-induced surges entering via RJ45 jacks. IC Role / Device Role / Timing Role: Bidirectional clamping element placed differential-mode across data pairs to suppress common-mode and differential-mode transients. Use Value: Enables compliance with GR-1089-CORE Level 3 (2 kV ring wave) without adding complex multi-stage protection networks. | Use Scenario: Suppressing back-EMF spikes generated by brushed DC motors in washing machines or HVAC blowers. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals to clamp inductive kickback before it reaches driver ICs or MCU GPIOs. Use Value: Extends lifespan of H-bridge MOSFETs and eliminates false resets caused by voltage overshoot on shared 3.3 V logic rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CAHE3/I | RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker rating. | Approved for commercial-grade industrial equipment where halogen-free requirement is not mandated. | Select when cost sensitivity outweighs automotive or green-material compliance needs. |
| SMAJ70CAHM3 | Lower 400 W PPPM; SMA package (smaller footprint, higher RθJA = 140 °C/W). | Suitable only for lower-energy transients or space-constrained PCBs where thermal margin allows. | Choose only if board area is critical and surge threat level is limited to IEC 61000-4-2 ±8 kV contact discharge. |
Compared with SMBJ70CAHE3/I and SMAJ70CAHM3, SMBJ70CAHM3/I uniquely combines halogen-free construction, AEC-Q101 qualification, and full 600 W surge capacity in SMB package - making it optimal for automotive and high-reliability industrial designs requiring traceable green sourcing and extended thermal performance.
Availability
SMBJ70CAHM3/I is available at Aetrix Electronics and suitable for industrial power supply protection, automotive sensor interface protection, and telecom line card surge protection requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ70CAHM3/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 is engineered for robust transient suppression in harsh environments - targeting automotive, industrial automation, and communications infrastructure where failure modes must be mitigated without compromising signal fidelity or thermal stability.
FAQ
What is the clamping voltage of SMBJ70CAHM3/I under a 10/1000 µs surge?
The SMBJ70CAHM3/I has a maximum clamping voltage (VC) of 113 V at 5.3 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured bidirectionally and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components remain within absolute maximum ratings.
Is SMBJ70CAHM3/I suitable for automotive applications?
Yes, SMBJ70CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance. It is explicitly rated for automotive-grade reliability testing including temperature cycling, HTRB, and ESD - making SMBJ70CAHM3/I appropriate for under-hood ECUs, body control modules, and sensor nodes.
How does the bidirectional nature of SMBJ70CAHM3/I affect its PCB layout?
The SMBJ70CAHM3/I has no polarity marking and symmetrical terminals, so PCB layout requires no orientation alignment - either pad can connect to the protected line. This simplifies routing in differential or floating systems (e.g., RS-485, CAN FD stubs) and eliminates risk of reverse installation during automated assembly.
What is the thermal resistance of SMBJ70CAHM3/I, and how does it impact board design?
SMBJ70CAHM3/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. To maintain TJ ≤ 150 °C under worst-case 600 W surge, designers must ensure adequate copper area and avoid excessive ambient temperature rise - especially in enclosed enclosures or stacked boards.
Does SMBJ70CAHM3/I meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, SMBJ70CAHM3/I meets MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. This means the device has unlimited floor life and may be placed directly into standard lead-free reflow ovens without pre-baking - reducing manufacturing complexity and eliminating moisture-related popcorning risks during assembly.
SMBJ70CAHM3/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):
- 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 (SMBJ)
SMBJ70CAHM3/I FAQ
1.How can I place an order for SMBJ70CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70CAHM3/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 SMBJ70CAHM3/I reliable?
The price and inventory of SMBJ70CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ70CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70CAHM3/I?
SMBJ70CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70CAHM3/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 SMBJ70CAHM3/I?
For technical support, including SMBJ70CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70CAHM3/I requirements.
6.How does Aetrix verify that SMBJ70CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ70CAHM3/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 SMBJ70CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ70CAHM3/I?
All SMBJ70CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70CAHM3/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 SMBJ70CAHM3/I part is unused and in its original packaging.
Return procedure for SMBJ70CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70CAHM3/I Tags
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