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Vishay General Semiconductor - Diodes Division SMAJ7.0CAHM3/I
- Part No.:
- SMAJ7.0CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0CAHM3/I.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,921
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Product details
Overview
SMAJ7.0CAHM3/I from Vishay General Semiconductor is a bidirectional 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, 12.0 V maximum clamping voltage (VC) at 33.3 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMAJ7.0CAHM3/I datasheet, SMAJ7.0CAHM3/I pinout, SMAJ7.0CAHM3/I application, or SMAJ7.0CAHM3/I equivalent, this device is evaluated for bidirectional surge suppression in 5–12 V rail protection, ESD-sensitive analog front-ends, and AEC-Q101-compliant automotive subsystems where low clamping voltage and fast response (<1 ns) are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (7.78 V / 8.60 V), VC = 12.0 V at IPPM = 33.3 A, and ID ≤ 800 μA at VWM = 7.0 V. Its glass-passivated junction ensures stable leakage and robust surge handling under repetitive 10/1000 μs transients.
Thermal performance is defined by RθJA = 120 °C/W and RθJL = 30 °C/W, supporting operation from –55 °C to +150 °C junction temperature. The HM3 suffix confirms halogen-free, RoHS-compliant, AEC-Q101-qualified construction with matte tin-plated leads solderable per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse working voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR (min/max) | 7.78 V / 8.60 V at IT = 10 mA - Confirmed breakdown threshold range; ensures reliable turn-on during overvoltage events. |
| VC @ IPPM | 12.0 V at 33.3 A - Clamped voltage during 400 W 10/1000 μs surge; protects downstream 5–12 V logic and analog components. |
| PPPM | 400 W - Peak pulse power rating (10/1000 μs); supports IEC 61000-4-5 Level 3/4 surge immunity testing. |
| ID @ VWM | ≤800 μA - Reverse leakage at rated stand-off voltage; minimizes quiescent power loss in battery-powered sensors. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments and industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount, low-profile package compatible with automated placement and reflow soldering (MSL Level 1, 260 °C peak). |
Pinout & Package
Two-terminal bidirectional device in SMA (DO-214AC) package; no polarity marking. Terminals are symmetrical-anode and cathode are functionally interchangeable due to bidirectional design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as input/output path for transient energy; no fixed polarity-clamps positive or negative surges equally. |
| Terminal 2 | Anode/Cathode (bidirectional) | Paired terminal completing the symmetrical clamping path; requires PCB layout with equal trace impedance to ground or rail. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints. |
| 400 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive electronics. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including body control modules, infotainment interfaces, and sensor hubs. |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes overvoltage stress on protected ICs-critical for 3.3 V/5 V logic and precision analog circuits. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies SMT manufacturing flow. |
Applications
| Automotive Sensor Interface Protection | Industrial RS-485 Transceiver Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus nodes and analog sensor outputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential pair or supply rail to shunt transients before they reach MCU or signal conditioner. Use Value: Limits induced surge voltage to ≤12.0 V, preventing latch-up or gate oxide damage in AEC-Q100 qualified microcontrollers and op-amps. |
Use Scenario: Safeguarding RS-485 transceivers (e.g., THVD1550) against ESD (IEC 61000-4-2) and lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Placed line-to-line and line-to-ground to clamp common-mode and differential-mode transients simultaneously. Use Value: Maintains signal integrity by clamping within 1 ns while sustaining 33.3 A peak current-preserving data rates up to 20 Mbps. |
| Consumer USB Port ESD Protection | Power Supply Input Rail Clamp |
|
Use Scenario: Adding secondary-level ESD protection on USB 2.0 D+/D– lines behind primary TVS arrays in smartphones and peripherals. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp absorbing ±15 kV contact discharge per IEC 61000-4-2. Use Value: Low 800 μA leakage avoids loading high-impedance data lines; 12.0 V VC prevents overshoot into 3.3 V PHY receivers. |
Use Scenario: Clamping 12 V DC input rails in PoE-powered devices and industrial controllers exposed to inductive switching noise. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor to divert surge energy away from DC-DC converter ICs. Use Value: 400 W rating handles repetitive 10/1000 μs transients from relay coils or motor drivers without degradation. |
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/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Suitable for commercial-grade industrial or consumer designs where automotive qualification is not required. | Select when cost sensitivity outweighs halogen-free or automotive compliance needs. |
| SMBJ7.0CAHM3/I | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package-higher thermal resistance (RθJA = 140 °C/W) and lower PPPM (600 W). | Offers higher surge margin but requires larger PCB area; less optimal for space-constrained automotive modules. | Choose only if board layout allows SMB footprint and higher clamping energy tolerance is prioritized over size. |
Compared with SMAJ7.0CAHM3/I, SMAJ7.0CAHE3/I trades halogen-free and AEC-Q101 compliance for lower cost, while SMBJ7.0CAHM3/I increases surge capacity at the expense of footprint and thermal efficiency-making SMAJ7.0CAHM3/I the optimal balance for AEC-Q101-compliant, space-limited 7 V rail protection.
Availability
SMAJ7.0CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial communication ports, and consumer USB power delivery systems requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMAJ7.0CAHM3/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, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMAJ series delivers standardized TVS performance in compact surface-mount packages, engineered specifically for robust transient suppression in automotive, industrial, and telecom infrastructure where AEC-Q101 compliance and low clamping voltage are mandatory.
FAQ
What does the 'HM3' suffix indicate in SMAJ7.0CAHM3/I?
The HM3 suffix in SMAJ7.0CAHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms the device meets automotive reliability standards-including temperature cycling, humidity testing, and mechanical shock-and uses environmentally compliant materials without brominated flame retardants. This makes SMAJ7.0CAHM3/I suitable for under-hood and safety-critical vehicle subsystems where regulatory compliance is mandatory.
Is SMAJ7.0CAHM3/I unidirectional or bidirectional, and how does that affect circuit placement?
SMAJ7.0CAHM3/I is a bidirectional TVS diode, meaning it clamps voltage transients of either polarity symmetrically-no cathode band marking is present. This allows placement across any two points needing mutual overvoltage protection, such as differential signal pairs (RS-485, CAN) or AC-coupled lines, without concern for orientation. Unlike unidirectional variants, SMAJ7.0CAHM3/I eliminates risk of incorrect installation in polarity-sensitive layouts.
What is the maximum clamping voltage of SMAJ7.0CAHM3/I, and at what current is it specified?
The maximum clamping voltage (VC) of SMAJ7.0CAHM3/I is 12.0 V, measured at a peak pulse current (IPPM) of 33.3 A using the industry-standard 10/1000 μs double-exponential waveform. This value defines the highest voltage the device allows to pass through to protected circuitry during a surge event, ensuring compatibility with 5 V and 12 V logic families and preventing damage to downstream ICs like microcontrollers or transceivers.
How does SMAJ7.0CAHM3/I perform under elevated ambient temperatures?
SMAJ7.0CAHM3/I derates linearly above TA = 25 °C, maintaining full 400 W pulse power capability only at room temperature. At 85 °C ambient, its peak pulse power drops to approximately 280 W per Vishay's Fig. 2 derating curve. Its RθJA of 120 °C/W means junction temperature rise is predictable under steady-state conditions-critical for thermal design in sealed enclosures or engine-bay applications where SMAJ7.0CAHM3/I must sustain repeated surges without thermal runaway.
Can SMAJ7.0CAHM3/I be used as a direct replacement for SMAJ7.0A in existing designs?
No-SMAJ7.0CAHM3/I is bidirectional, while SMAJ7.0A is unidirectional with a marked cathode band. Substituting SMAJ7.0CAHM3/I for SMAJ7.0A would eliminate polarity dependence but may alter clamping behavior in DC-biased circuits, especially where forward conduction matters. For true drop-in replacement, use SMAJ7.0AHM3/I (unidirectional, HM3-suffix). Always verify layout, grounding, and system-level surge test compliance before interchanging SMAJ7.0CAHM3/I with unidirectional variants.
SMAJ7.0CAHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMAJ7.0CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0CAHM3/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/I reliable?
The price and inventory of SMAJ7.0CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ7.0CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0CAHM3/I?
SMAJ7.0CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0CAHM3/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/I?
For technical support, including SMAJ7.0CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0CAHM3/I requirements.
6.How does Aetrix verify that SMAJ7.0CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ7.0CAHM3/I?
All SMAJ7.0CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ7.0CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.0CAHM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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