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Vishay General Semiconductor - Diodes Division SMBJ70CAHM3/H
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- Part No.:
- SMBJ70CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70CAHM3/H.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,538
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Product details
Overview
SMBJ70CAHM3/H 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 stand-off voltage (VWM), 77.8–86.0 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤113 V at 5.3 A peak surge current - used to protect MOSFETs, sensor interfaces, and industrial I/O circuits against ESD and inductive switching spikes.
For engineers reviewing the SMBJ70CAHM3/H datasheet, SMBJ70CAHM3/H pinout, SMBJ70CAHM3/H application, or SMBJ70CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, 113 V max clamping voltage at rated IPPM, MSL Level 1 moisture sensitivity, halogen-free RoHS-compliant construction (HM3 suffix), and AEC-Q101 qualification suitability for automotive-grade transient protection.
Technical Context
This device operates as a voltage-clamping protector with symmetrical reverse/forward conduction behavior due to its bidirectional structure. Its glass-passivated junction ensures stable breakdown characteristics and fast response (<1 ns), while the low incremental surge resistance minimizes voltage overshoot during transient events.
The SMBJ70CAHM3/H complies with ANSI/IEEE C62.35 for transient suppressor definitions and meets UL 497B recognition (QVGQ2). It is rated for -55 °C to +150 °C operating junction temperature and derates linearly above 25 °C ambient per Figure 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - guaranteed breakdown threshold range defining turn-on consistency |
| VC @ IPPM | ≤113 V at 5.3 A - clamped voltage under 600 W 10/1000 µs surge, limiting stress on downstream ICs |
| PPPM | 600 W - peak pulse power handling capacity for transient suppression without failure |
| IPPM | 5.3 A - maximum non-repetitive surge current supported with 10/1000 µs waveform |
| TJ max | +150 °C - maximum junction temperature enabling operation in high-ambient industrial environments |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.59 mm max length and 2.20 mm max height |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, meeting JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; symmetrical with cathode in bidirectional mode | Enables clamping during positive or negative transients - no fixed anode/cathode polarity |
| Cathode | Current exit point in forward bias; functionally identical to anode in bidirectional operation | Both terminals behave identically under reverse or forward surge - no band marking required |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or floating signal lines without polarity constraints - e.g., RS-485, CAN bus, sensor bridges |
| 600 W peak pulse power | Handles high-energy transients from inductive load switching (e.g., solenoid drivers, motor controllers) |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak - compatible with standard SMT assembly without dry-pack requirements |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including body electronics, infotainment power rails, and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for industrial and consumer end equipment without compromising surge robustness |
Applications
| Industrial Motor Control | Automotive Sensor Interface |
|---|---|
|
Use Scenario: Protection of gate driver inputs and feedback lines in 24 V DC motor control modules exposed to back-EMF spikes. IC Role / Device Role / Timing Role: Voltage clamping element placed across MOSFET gate-source or op-amp input pins to limit transient overvoltage. Use Value: Limits gate oxide stress to <113 V during 5.3 A surges, preventing latch-up or permanent damage in IGBT/MOSFET drivers. |
Use Scenario: ESD and load-dump protection on analog output lines of pressure/temperature sensors in engine bay environments. IC Role / Device Role / Timing Role: Bidirectional shunt clamp on sensor signal pairs (e.g., 0–5 V ratiometric outputs) referenced to chassis ground. Use Value: Maintains signal integrity by clamping ±113 V transients while adding <1 pF junction capacitance - negligible impact on 10 kHz sensor bandwidth. |
| Telecom Power Feeds | Consumer USB-C Port Protection |
|
Use Scenario: Surge suppression on 48 V PoE (Power over Ethernet) data line pairs subjected to lightning-induced common-mode transients. IC Role / Device Role / Timing Role: Paired SMBJ70CAHM3/H devices configured in back-to-back arrangement across differential pairs. Use Value: Clamps common-mode surges to <113 V while preserving IEEE 802.3af/at signaling integrity via symmetric bidirectional response. |
Use Scenario: Overvoltage protection on VBUS and CC lines of USB-C receptacles in portable docking stations. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between VBUS and GND, and CC and GND, to absorb hot-plug and ESD events. Use Value: Withstands ±15 kV contact ESD (IEC 61000-4-2) and limits VBUS overshoot to ≤113 V during 10/1000 µs surges up to 5.3 A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CAHE3/H | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial-grade industrial PCBs where automotive qualification is not required | Select when halogen-free content or automotive qualification is not mandated by end-equipment standards |
| SMAJ70CAHM3 | Lower 400 W PPPM, SMA package (smaller footprint, higher thermal resistance) | Limited to lower-energy transients; less robust in high-surge industrial environments | Choose only if board space is constrained and surge threat level is below 400 W - not drop-in replacement |
Compared with SMBJ70CAHE3/H, the SMBJ70CAHM3/H adds halogen-free construction and AEC-Q101 qualification without changing clamping performance; versus SMAJ70CAHM3, it delivers 50 % higher surge power handling and superior thermal dissipation in the larger SMB package.
Availability
SMBJ70CAHM3/H is available at Aetrix Electronics and suitable for industrial motor control, automotive sensor interface, and telecom power feed applications requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant transient protection.
Supply support for SMBJ70CAHM3/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, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial automation, and communications infrastructure where robustness and qualification compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ70CAHM3/H under maximum rated surge current?
The SMBJ70CAHM3/H clamps to a maximum of 113 V when subjected to its rated peak pulse current of 5.3 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet Document Number 88392, page 2 - ensuring predictable overvoltage limiting for protected circuitry.
Is SMBJ70CAHM3/H suitable for automotive applications?
Yes, SMBJ70CAHM3/H is AEC-Q101 qualified (as indicated by the HM3 suffix) and rated for operation from -55 °C to +150 °C junction temperature. It is specified for use in automotive body electronics, sensor interfaces, and infotainment power rails where transient immunity and qualification compliance are required.
Does SMBJ70CAHM3/H have polarity markings on the package?
No, SMBJ70CAHM3/H is a bidirectional TVS diode and carries no cathode band or polarity marking. Its symmetrical construction allows installation in either orientation on PCBs - essential for protecting AC-coupled or floating differential signal lines such as RS-485 or CAN bus.
What is the thermal resistance of SMBJ70CAHM3/H from junction to ambient?
The typical junction-to-ambient thermal resistance (RθJA) of SMBJ70CAHM3/H is 100 °C/W when mounted on the minimum recommended pad layout (0.2" × 0.2" copper pads per terminal). This value supports thermal design validation for sustained power dissipation up to 5.0 W at 50 °C ambient.
How does SMBJ70CAHM3/H differ from unidirectional SMBJ70A variants?
SMBJ70CAHM3/H provides symmetrical clamping for both polarities, making it ideal for AC signals or floating nodes; unidirectional SMBJ70A has a cathode band and only clamps in reverse bias. The "CA" suffix explicitly denotes bidirectional functionality, and SMBJ70CAHM3/H's VBR and VC values apply identically in both directions.
SMBJ70CAHM3/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:
- 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/H FAQ
1.How can I place an order for SMBJ70CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70CAHM3/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 SMBJ70CAHM3/H reliable?
The price and inventory of SMBJ70CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ70CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70CAHM3/H?
SMBJ70CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70CAHM3/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 SMBJ70CAHM3/H?
For technical support, including SMBJ70CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70CAHM3/H requirements.
6.How does Aetrix verify that SMBJ70CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ70CAHM3/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 SMBJ70CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ70CAHM3/H?
All SMBJ70CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70CAHM3/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 SMBJ70CAHM3/H part is unused and in its original packaging.
Return procedure for SMBJ70CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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