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Vishay General Semiconductor - Diodes Division SMAJ7.0CAHM3_A/I
- Part No.:
- SMAJ7.0CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0CAHM3_A/I.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,005
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Product details
Overview
SMAJ7.0CAHM3_A/I 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 and power lines. It features a 7.0 V stand-off voltage (VWM), 7.78–8.60 V breakdown voltage (VBR) at 10 mA, 400 W peak pulse power (10/1000 μs), and clamps to ≤12.0 V at 33.3 A peak surge current - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line conditioning.
For engineers reviewing the SMAJ7.0CAHM3_A/I datasheet, SMAJ7.0CAHM3_A/I pinout, SMAJ7.0CAHM3_A/I application, or SMAJ7.0CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche junction structure, responding within <1 ps to transient overvoltages. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity-dependent layout constraints in AC-coupled or floating signal paths.
Thermal performance is defined by RθJA = 120 °C/W (on recommended pad layout) and RθJL = 30 °C/W, enabling reliable operation up to TJ = +150 °C. The 400 W peak pulse rating applies below 78 V; above that threshold, derating to 300 W per specification note (1).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping onset. |
| VBR (min/max) | 7.78 V / 8.60 V at 10 mA - Ensures consistent avalanche initiation across production lots; guarantees clamping starts no later than 8.60 V. |
| VC @ IPPM | 12.0 V at 33.3 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs like microcontrollers or transceivers. |
| PPPM | 400 W - Peak transient energy absorption capacity under standard waveform; supports robust protection against ISO 7637-2 Pulse 1/2a/5a in automotive systems. |
| ID @ VWM | 200 μA max - Low leakage preserves signal integrity and battery life in always-on circuits such as CAN or LIN bus nodes. |
| TJ range | −55 °C to +150 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment without thermal derating penalties. |
| Package | SMA (DO-214AC) - Standardized 2-pin SMD outline with 0.208" × 0.157" footprint; compatible with JEDEC J-STD-020 MSL Level 1 reflow profiles (peak 260 °C). |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Provides low-impedance path to ground or reference rail during positive or negative surges; symmetrical with cathode in CA devices. |
| Cathode | Transient return path (bidirectional) | Functions identically to anode under reverse polarity events; no functional distinction between terminals in SMAJ7.0CAHM3_A/I. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, ADAS sensors, and body electronics - meets stress test requirements for temperature cycling, HTRB, and ESD. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-20E; eliminates brominated flame retardants and antimony trioxide, supporting green manufacturing and end-of-life recycling. |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients such as load dump (ISO 16750-2) and inductive switching spikes without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage exposure to protected ICs - e.g., keeps 3.3 V or 5 V logic rails within safe operating area during surge events. |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow without baking or special handling; reduces assembly cost and process complexity in high-volume SMT lines. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay environments exposed to ISO 7637-2 Pulse 5a (load dump). IC Role / Device Role / Timing Role: Bidirectional clamping element placed between sensor output and microcontroller ADC input, shunting surge energy to chassis ground. Use Value: Limits voltage excursion to ≤12.0 V during 100 V/50 ms transients, preventing ADC saturation and latch-up in 3.3 V or 5 V signal chains. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controller (PLC) modules subject to field wiring faults and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input terminals to clamp induced surges before they reach optocoupler or Schmitt trigger inputs. Use Value: Maintains VWM = 7.0 V margin below nominal 24 V supply while clamping 400 W surges to protect isolation barriers and reduce false triggering. |
| Telecom Line Interface | Consumer USB Port ESD Protection |
|
Use Scenario: Shielding RS-485 transceiver data lines in base station backhaul equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional TVS installed differential-mode across A/B bus lines, referenced to local ground plane. Use Value: Achieves sub-12 V clamping at 33.3 A enables compliance with ITU-T K.20/21 immunity standards without adding series impedance or signal distortion. |
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines in portable audio devices, supplementing internal IC-level protection. IC Role / Device Role / Timing Role: Fast-response clamping device placed immediately after connector, before series resistors or EMI filters. Use Value: Sub-1 ps response time and 200 μA leakage preserve signal integrity at 480 Mbps while passing IEC 61000-4-2 ±15 kV contact discharge testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0CAHE3_A/I | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant with brominated flame retardants (non-halogen-free). | Acceptable for commercial/industrial use where halogen-free mandate does not apply; unsuitable for automotive OEMs requiring full material compliance. | Select SMAJ7.0CAHE3_A/I only if halogen content is not restricted by customer environmental policy. |
| SMBJ7.0CAHM3_A/I | Same VWM, VBR, and VC, but SMB (DO-214AA) package - 27% larger footprint and higher RθJA (90 °C/W vs. 120 °C/W), rated for 600 W PPPM. | Better suited for high-power industrial drives or where board space allows larger package; less optimal for dense automotive ECUs. | Choose SMBJ7.0CAHM3_A/I when higher surge margin or thermal headroom is required and PCB real estate permits. |
Compared with SMAJ7.0CAHE3_A/I, the SMAJ7.0CAHM3_A/I offers halogen-free construction for stricter automotive material compliance; versus SMBJ7.0CAHM3_A/I, it trades 200 W lower peak power for 30% smaller footprint and tighter layout integration in space-constrained modules.
Availability
SMAJ7.0CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line conditioning requiring stable component supply, AEC-Q101 validation, and halogen-free compliance.
Supply support for SMAJ7.0CAHM3_A/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 designs and manufactures discrete semiconductors including diodes, MOSFETs, and TVS devices, with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMAJ series targets board-level transient protection in harsh environments - engineered for fast response, repeatable clamping, and robust thermal performance in automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SMAJ7.0CAHM3_A/I at its rated peak pulse current?
The SMAJ7.0CAHM3_A/I clamps to a maximum of 12.0 V at its rated peak pulse current of 33.3 A under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for downstream circuitry. The SMAJ7.0CAHM3_A/I maintains this clamping performance across its full operating temperature range.
Is SMAJ7.0CAHM3_A/I qualified for automotive applications?
Yes, SMAJ7.0CAHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix and confirmed in the Vishay ordering information table (page 3). It undergoes stress testing for temperature cycling, high-temperature reverse bias, and ESD per AEC-Q101 Rev D, making it suitable for engine control, ADAS, and body electronics. The SMAJ7.0CAHM3_A/I also meets MSL Level 1 for lead-free reflow compatibility in automotive manufacturing.
How does the bidirectional design of SMAJ7.0CAHM3_A/I affect its circuit implementation?
The bidirectional design of SMAJ7.0CAHM3_A/I means both terminals are functionally identical - there is no cathode band marking, and clamping occurs symmetrically for positive or negative transients. This simplifies PCB layout by eliminating polarity orientation checks and enables use in AC-coupled or floating signal paths such as RS-485, CAN FD, or audio lines. The SMAJ7.0CAHM3_A/I delivers identical VBR and VC in either direction per datasheet specifications.
What is the maximum reverse leakage current for SMAJ7.0CAHM3_A/I at its stand-off voltage?
The maximum reverse leakage current (ID) for SMAJ7.0CAHM3_A/I is 200 μA at its 7.0 V stand-off voltage (VWM), tested at TA = 25 °C. This low leakage preserves signal fidelity in high-impedance sensor interfaces and extends battery life in always-on systems. The SMAJ7.0CAHM3_A/I maintains this specification across its full −55 °C to +150 °C junction temperature range per thermal derating curves in the datasheet.
Does SMAJ7.0CAHM3_A/I require heatsinking for standard operation?
No external heatsink is required for SMAJ7.0CAHM3_A/I under typical transient conditions, as its thermal resistance (RθJA = 120 °C/W) is specified for mounting on 0.2" × 0.2" copper pads - sufficient for single-event surge dissipation. Continuous power dissipation is limited to 3.3 W, but the SMAJ7.0CAHM3_A/I is intended for transient suppression, not steady-state power handling. Layout adherence to the recommended pad dimensions ensures compliance with rated PPPM and thermal limits.
SMAJ7.0CAHM3_A/I 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):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- 33.3A
- 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)
SMAJ7.0CAHM3_A/I FAQ
1.How can I place an order for SMAJ7.0CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0CAHM3_A/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 SMAJ7.0CAHM3_A/I reliable?
The price and inventory of SMAJ7.0CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.0CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ7.0CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0CAHM3_A/I?
SMAJ7.0CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0CAHM3_A/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 SMAJ7.0CAHM3_A/I?
For technical support, including SMAJ7.0CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ7.0CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0CAHM3_A/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 SMAJ7.0CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ7.0CAHM3_A/I?
All SMAJ7.0CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0CAHM3_A/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 SMAJ7.0CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ7.0CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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