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Vishay General Semiconductor - Diodes Division SMAJ70CAHM3_A/H
- Part No.:
- SMAJ70CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CAHM3_A/H.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,328
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Product details
Overview
SMAJ70CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) 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, 113 V maximum clamping voltage (VC) at 3.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ70CAHM3_A/H datasheet, SMAJ70CAHM3_A/H pinout, SMAJ70CAHM3_A/H application, or SMAJ70CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), junction temperature range (−55 °C to +150 °C), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche behavior in both directions due to its bidirectional construction. Its glass-passivated junction enables fast response time (<1 ps) and low incremental surge resistance, critical for suppressing ESD and lightning-induced surges per IEC 61000-4-2/4-5.
The SMAJ70CAHM3_A/H is rated for 400 W peak pulse power below 78 V (derated to 300 W above 78 V), with clamping performance validated under 10/1000 μs waveform conditions. It meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - ensures reliable avalanche conduction onset within defined tolerance |
| VC @ IPPM | 113 V at 3.5 A - limits transient voltage seen by downstream circuitry during surge events |
| PPPM | 400 W (10/1000 μs) - energy-handling capacity for common industrial surge waveforms |
| TJ max. | +150 °C - enables operation in under-hood automotive and high-temperature industrial environments |
| RθJA | 120 °C/W - defines thermal derating requirement for PCB copper pad layout (0.2" × 0.2") |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. No polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Provides symmetrical conduction path for positive and negative transients |
| Cathode | Transient return path (bidirectional) | Functions identically to anode; no functional distinction in CA-type devices |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 400 W peak pulse power | Supports robust immunity against IEC 61000-4-5 Level 3 (1 kV surge) on 50 Ω source impedance |
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics applications requiring extended lifetime and stress resilience |
| MSL Level 1 | Allows unlimited floor life and compatibility with standard lead-free reflow profiles (peak 260 °C) |
| Glass passivated junction | Ensures stable VBR over time and improved surge endurance versus epoxy-passivated alternatives |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across differential or single-ended signal lines upstream of interface ICs. Use Value: Limits induced transients to ≤113 V, preserving signal integrity and preventing latch-up in 5 V or 3.3 V logic interfaces. |
Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against field-wiring surges and relay coil flyback. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on each input channel, referenced to common ground. Use Value: Absorbs 400 W surge energy without degradation, enabling >100,000 surge cycles per IEC 61000-4-5 compliance testing. |
| Consumer Power Adapter Output Protection | Telecom Line Card Surge Suppression |
Use Scenario: Secondary-side overvoltage clamping in USB-C PD adapters and AC/DC wall adapters to prevent damage during output short-circuit recovery. IC Role / Device Role / Timing Role: Standoff-rated TVS across regulated DC output rails (e.g., 5 V, 9 V, 15 V, 20 V). Use Value: Clamps to 113 V within nanoseconds, protecting downstream USB PD controllers and port switches during fault conditions. |
Use Scenario: Primary protection stage on Ethernet PHY or xDSL line interface cards exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-line bidirectional suppressor before gas discharge tube (GDT) or series impedance network. Use Value: Fast response (<1 ps) initiates clamping before GDT fires, reducing let-through energy to <10 mJ for secondary protection stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CAHE3_A/H | RoHS-compliant, commercial-grade variant without halogen-free certification; same electrical specs and AEC-Q101 qualification | Approved for non-automotive industrial use where halogen-free mandate does not apply | Select when halogen-free material compliance is not required and cost optimization is prioritized |
| SMBJ70CAHM3_A/H | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 25 % larger footprint, 50 % higher RθJA (180 °C/W) | Better suited for lower-power or thermally relaxed layouts; not drop-in compatible due to different pad dimensions | Choose only if board space allows larger package and thermal margin exceeds 120 °C/W requirement |
Compared with SMAJ70CAHM3_A/H, the HE3 variant trades halogen-free compliance for lower unit cost in non-regulated environments, while the SMBJ70CAHM3_A/H offers identical protection performance at the expense of PCB area and thermal efficiency - neither is pin-compatible, but both serve overlapping surge suppression roles.
Availability
SMAJ70CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O terminals, and telecom line card designs requiring stable component supply, AEC-Q101 validation, and halogen-free manufacturing compliance.
Supply support for SMAJ70CAHM3_A/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, power efficiency, and automotive qualification.
The SMAJ series targets high-reliability transient suppression in space-constrained surface-mount applications, with design focus on fast clamping, repeatable surge endurance, and seamless integration into automotive and industrial PCB assemblies.
FAQ
What is the clamping voltage of SMAJ70CAHM3_A/H at its rated peak pulse current?
The SMAJ70CAHM3_A/H has a maximum clamping voltage (VC) of 113 V at 3.5 A peak pulse current (IPPM), measured under standardized 10/1000 μs waveform conditions. This value defines the upper voltage limit imposed on protected circuitry during surge events and is guaranteed across the full operating temperature range of −55 °C to +150 °C. The SMAJ70CAHM3_A/H maintains this clamping performance without parameter shift after repeated surge exposure when operated within datasheet limits.
Is SMAJ70CAHM3_A/H qualified for automotive applications?
Yes, SMAJ70CAHM3_A/H is AEC-Q101 qualified, meaning it has passed accelerated stress tests including temperature cycling, high-temperature reverse bias (HTRB), and unbiased highly accelerated stress testing (UHAST). The "HM3" suffix explicitly denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. This makes SMAJ70CAHM3_A/H suitable for automotive powertrain, chassis, and body electronics where long-term reliability under thermal and mechanical stress is mandatory.
How does the bidirectional configuration of SMAJ70CAHM3_A/H affect its usage compared to unidirectional variants?
The "CA" suffix in SMAJ70CAHM3_A/H indicates bidirectional construction, meaning it provides symmetrical clamping for both positive and negative transients without polarity sensitivity. Unlike unidirectional types (e.g., SMAJ70A), SMAJ70CAHM3_A/H requires no cathode/anode orientation during placement and is ideal for AC-coupled lines, differential buses, or floating grounds. Its VBR and VC values apply equally in both directions, simplifying layout and eliminating risk of incorrect orientation during automated assembly.
What is the thermal resistance and recommended PCB layout for SMAJ70CAHM3_A/H?
SMAJ70CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under sustained power dissipation, designers must adhere to this pad size and ensure adequate copper area and via stitching beneath the SMA (DO-214AC) package. Derating curves in the datasheet show that power handling drops linearly above 25 °C ambient, requiring layout-aware thermal design for high-temperature environments.
Does SMAJ70CAHM3_A/H meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, SMAJ70CAHM3_A/H meets MSL Level 1 per J-STD-020, meaning it has unlimited floor life and can withstand peak reflow temperatures up to 260 °C without preconditioning. This eliminates bake-out requirements and supports direct placement into standard lead-free SMT processes. The device's molding compound complies with UL 94 V-0 flammability rating, and its matte tin-plated leads conform to J-STD-002 and JESD 22-B102 solderability standards - all verified for the HM3 halogen-free construction of SMAJ70CAHM3_A/H.
SMAJ70CAHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- 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):
- 3.5A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ70CAHM3_A/H FAQ
1.How can I place an order for SMAJ70CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CAHM3_A/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 SMAJ70CAHM3_A/H reliable?
The price and inventory of SMAJ70CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ70CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CAHM3_A/H?
SMAJ70CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CAHM3_A/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 SMAJ70CAHM3_A/H?
For technical support, including SMAJ70CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ70CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ70CAHM3_A/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 SMAJ70CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ70CAHM3_A/H?
All SMAJ70CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CAHM3_A/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 SMAJ70CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ70CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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