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Vishay General Semiconductor - Diodes Division SMAJ7.0CAHM3/H
- Part No.:
- SMAJ7.0CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0CAHM3/H.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,032
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Product details
Overview
SMAJ7.0CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in 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, clamps transients to ≤12.0 V at 33.3 A peak pulse current (IPPM), and delivers 400 W peak pulse power (10/1000 μs waveform) - ideal for safeguarding I/O ports and sensor interfaces in automotive ECUs and industrial controllers.
For engineers reviewing the SMAJ7.0CAHM3/H datasheet, SMAJ7.0CAHM3/H pinout, SMAJ7.0CAHM3/H application, or SMAJ7.0CAHM3/H equivalent, key selection criteria include its bidirectional polarity, SMA (DO-214AC) package compatibility with automated SMT assembly, AEC-Q101 qualification for automotive use, and verified clamping performance under repetitive surge conditions per IEC 61000-4-5.
Technical Context
This TVS operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1 μA at 7.0 V), while the low incremental surge resistance supports fast response to sub-nanosecond ESD events.
The device is rated for continuous power dissipation of 3.3 W on an infinite heatsink and withstands junction temperatures from –55 °C to +150 °C. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), confirming suitability for compact PCB layouts with limited copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range for protected line. |
| VBR min/max | 7.78 V / 8.60 V at 10 mA - tight breakdown window ensures predictable turn-on and avoids false triggering near nominal rail. |
| VC @ IPPM | 12.0 V at 33.3 A - clamping voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 400 W - peak pulse power handling capability; enables protection against severe load-dump or inductive-switching transients. |
| ID @ VWM | <1 μA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in battery-powered systems. |
| TJ max | +150 °C - extended junction temperature rating supports operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.28 mm × 4.50 mm footprint and 2.29 mm height; compatible with J-STD-020 MSL Level 1 reflow. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance. Bidirectional configuration has no polarity marking - terminals are functionally identical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve as interchangeable surge current entry/exit points; no cathode band or polarity marking required for bidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - supports use in ADAS sensors and body control modules. |
| 400 W peak pulse power | Withstands 10/1000 μs surges up to 33.3 A without degradation - exceeds IEC 61000-4-5 Level 4 requirements for industrial equipment. |
| Glass passivated junction | Ensures stable VBR over lifetime and across temperature; eliminates parameter drift caused by moisture ingress or metallization migration. |
| MSL Level 1 | Zero floor life limitation - can be stored indefinitely at ambient conditions and processed using standard 260 °C peak reflow profile without baking. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with JEDEC J-STD-609A Class 1 halogen content limits and EU RoHS Directive 2011/65/EU. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceiver I/O pins in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional transient clamp placed directly at connector entry point to shunt surge energy before it reaches PHY layer. Use Value: Clamps 12 V system transients to ≤12.0 V, preserving transceiver functionality without requiring series impedance or timing delays. |
Use Scenario: Safeguarding RS-485 and CAN FD data lines in programmable logic controllers subjected to EFT bursts and lightning-induced surges. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF typical) bidirectional suppressor placed across differential pair to maintain signal integrity at 5 Mbps. Use Value: Limits voltage excursion to <12.0 V during 400 W surges while adding negligible propagation delay or jitter to high-speed bus signals. |
| Consumer USB Port Protection | Power Supply Input Stage |
|
Use Scenario: Guarding USB 2.0 D+/D– lines in smart home hubs against human-body-model (HBM) ESD and cable discharge events. IC Role / Device Role / Timing Role: Fast-response TVS located adjacent to USB connector to divert >8 kV contact ESD before reaching USB controller ESD diodes. Use Value: Sub-1 ns response time and <12.0 V clamping prevent latch-up or damage to 3.3 V tolerant PHY circuitry. |
Use Scenario: Secondary-side overvoltage suppression on 5 V/12 V DC input rails of embedded power supplies in medical monitors. IC Role / Device Role / Timing Role: Standoff-rated clamp installed after bulk filter capacitor to absorb residual switching spikes and external surges. Use Value: Withstands repeated 400 W transients without derating below 7.0 V operating margin - extends supply uptime in noisy factory environments. |
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/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable where halogen-free requirement is not mandated by end-customer specification. | Select SMAJ7.0CAHE3/H for cost-sensitive commercial designs lacking halogen restrictions. |
| SMBJ7.0CAHM3/H | Same VWM/VBR/VC specs but in SMB (DO-214AA) package - 20 % larger footprint and 10 % higher thermal resistance (RθJA = 135 °C/W). | Better suited for higher-power or lower-density layouts where board space permits larger pad area. | Choose SMBJ7.0CAHM3/H when thermal margin is constrained and additional copper area is available for heat spreading. |
Compared with SMAJ7.0CAHE3/H, the SMAJ7.0CAHM3/H adds halogen-free compliance without sacrificing AEC-Q101 qualification or clamping performance; versus SMBJ7.0CAHM3/H, it offers tighter board space utilization and improved thermal efficiency in high-density automotive modules.
Availability
SMAJ7.0CAHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial communication interfaces, and consumer port protection requiring stable component supply and full traceability through production lifecycles.
Supply support for SMAJ7.0CAHM3/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 SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where consistent clamping, long-term stability, and AEC-Q101 validation are mandatory.
FAQ
What does the "HM3" suffix indicate in SMAJ7.0CAHM3/H?
The HM3 suffix in SMAJ7.0CAHM3/H denotes halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance and AEC-Q101 qualification. It distinguishes this variant from E3 (RoHS only) and HE3 (RoHS + AEC-Q101 but not halogen-free). The "H" package code specifies 7-inch tape-and-reel delivery with 1800 units per reel, and "/H" confirms revision-level traceability per Vishay's ordering system.
Is SMAJ7.0CAHM3/H suitable for protecting 5 V logic lines?
Yes, SMAJ7.0CAHM3/H is well-suited for 5 V logic line protection: its 7.0 V stand-off voltage (VWM) provides 40 % headroom above nominal 5 V rails, while clamping at ≤12.0 V during surge ensures downstream 5 V-tolerant ICs remain within absolute maximum ratings. Its bidirectional nature eliminates polarity concerns on bidirectional buses like I²C or USB D+/D–.
How does SMAJ7.0CAHM3/H perform under repeated surge stress?
SMAJ7.0CAHM3/H maintains stable clamping performance under repetitive 10/1000 μs surges at 0.01 % duty cycle, delivering consistent 400 W pulse power handling. Its glass-passivated junction and low incremental resistance minimize parameter shift after thousands of surge events - validated per AEC-Q101 stress test protocols including surge endurance and high-temperature operating life.
Can SMAJ7.0CAHM3/H replace SMAJ7.0A in unidirectional circuits?
No - SMAJ7.0CAHM3/H is strictly bidirectional and lacks polarity marking; substituting it into a unidirectional design risks incorrect orientation and failure to clamp forward-biased transients. For unidirectional applications, use SMAJ7.0AHM3/H instead. The "CA" suffix explicitly defines symmetrical conduction behavior, which is incompatible with cathode-anode routing constraints in unidirectional topologies.
What is the thermal resistance of SMAJ7.0CAHM3/H in standard PCB layout?
SMAJ7.0CAHM3/H exhibits 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. This value assumes standard FR-4 substrate and no internal plane coupling; adding thermal vias or ground-plane connections can reduce RθJA by up to 30 %, improving sustained power handling in high-duty-cycle applications.
SMAJ7.0CAHM3/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:
- 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/H FAQ
1.How can I place an order for SMAJ7.0CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0CAHM3/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 SMAJ7.0CAHM3/H reliable?
The price and inventory of SMAJ7.0CAHM3/H 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/H is usually 5 days.
3.What payment methods are accepted for SMAJ7.0CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0CAHM3/H?
SMAJ7.0CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0CAHM3/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 SMAJ7.0CAHM3/H?
For technical support, including SMAJ7.0CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0CAHM3/H requirements.
6.How does Aetrix verify that SMAJ7.0CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0CAHM3/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 SMAJ7.0CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ7.0CAHM3/H?
All SMAJ7.0CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0CAHM3/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 SMAJ7.0CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ7.0CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.0CAHM3/H Tags
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