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Vishay General Semiconductor - Diodes Division SMAJ7.0CAHE3_A/H
- Part No.:
- SMAJ7.0CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0CAHE3_A/H.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ7.0CAHE3_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 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 rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ7.0CAHE3_A/H datasheet, SMAJ7.0CAHE3_A/H pinout, SMAJ7.0CAHE3_A/H application, or SMAJ7.0CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.55), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical reverse/forward conduction behavior due to its bidirectional construction. Its glass-passivated junction enables fast response time (<1 ns) and low incremental surge resistance, critical for suppressing ESD and inductive switching spikes.
The SMAJ7.0CAHE3_A/H is rated for -55 °C to +150 °C operating junction temperature, exhibits 0.065 %/°C temperature coefficient of VBR, and delivers 33.3 A peak pulse current under standardized 10/1000 μs waveform conditions when mounted on 0.2" × 0.2" copper pads - confirming suitability for repetitive transient suppression in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse stand-off voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR min/max | 7.78 V / 8.60 V at 10 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 12.0 V at 33.3 A - Clamping voltage limits downstream component stress; clamping ratio VC/VBR = ~1.55 indicates high efficiency. |
| PPPM | 400 W (10/1000 μs) - Peak transient energy absorption capacity; derates to 300 W above 78 V per spec. |
| ID @ VWM | 200 μA - Low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| TJ max | +150 °C - Enables operation in under-hood automotive and industrial motor drive environments without thermal shutdown. |
| MSL Level | Level 1 (J-STD-020) - Supports standard reflow profiles up to 260 °C peak, eliminating pre-bake requirements for SMT assembly. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. No polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Conducts surge current in either direction; connects to protected line (e.g., CAN_H or RS-485 A). |
| Cathode | Transient current exit (bidirectional) | Completes clamping path to ground or reference rail; symmetric role with Anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces per stress test requirements. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 surge events (line-to-ground, 2 Ω source impedance) without degradation when properly mounted. |
| Glass passivated junction | Ensures stable VBR over lifetime and improved reliability vs. epoxy-passivated alternatives in humid or thermally cycled environments. |
| Low clamping voltage (12.0 V) | Protects 5 V and 3.3 V logic interfaces (e.g., microcontroller GPIO, UART lines) by limiting fault voltage below damage thresholds. |
| MSL Level 1 rating | Enables direct placement into high-volume SMT lines without dry-packaging or baking, reducing manufacturing cost and cycle time. |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between sensor output and MCU ADC input. Use Value: Limits transient voltage to ≤12.0 V, preventing ADC saturation and latch-up while maintaining signal fidelity at 7.0 V nominal operating range. |
Use Scenario: Safeguarding differential data lines in factory automation PLCs subject to EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: Line-to-line and line-to-ground TVS pair across RS-485 bus (A/B terminals). Use Value: Absorbs 400 W surges without altering bus DC bias, preserving signal integrity and enabling >500 kbps data rates under EMC stress. |
| Consumer USB Port ESD | Power Supply Input Stage |
Use Scenario: ESD protection for USB 2.0 D+/D− lines in portable medical monitors and smart home hubs. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at USB connector pins. Use Value: Responds in <1 ns to ±15 kV contact discharge (IEC 61000-4-2), clamping to 12.0 V to prevent PHY damage while adding <0.5 pF capacitance. |
Use Scenario: Secondary-side transient suppression on 5 V/12 V DC outputs of AC-DC adapters powering embedded controllers. IC Role / Device Role / Timing Role: Clamp device between regulated output and ground to absorb switch-mode noise and back-EMF spikes. Use Value: Maintains output regulation during 33.3 A transients, preventing brownout resets and ensuring uninterrupted operation of downstream logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0CA-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade without AEC-Q101 qualification. | Lacks automotive qualification; suitable for consumer/industrial designs not requiring AEC validation. | Select SMAJ7.0CAHE3_A/H when automotive-grade reliability and traceable qualification records are mandatory. |
| SMBJ7.0CAHE3_A/H | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package with 600 W PPPM rating and higher IPPM (43.5 A). | Offers higher surge margin and better thermal dissipation; requires larger PCB footprint. | Choose SMBJ7.0CAHE3_A/H where system-level surge testing exceeds IEC 61000-4-5 Level 4 or layout allows SMB footprint. |
Compared with SMAJ7.0CA-E3/61, the SMAJ7.0CAHE3_A/H adds AEC-Q101 qualification for automotive use; compared with SMBJ7.0CAHE3_A/H, it trades 200 W peak power and 10.2 A higher IPPM for 30 % smaller board area and identical clamping performance at lower surge levels.
Availability
SMAJ7.0CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial communication ports, consumer USB protection, and DC power rail stabilization requiring stable component supply across production lifecycles.
Supply support for SMAJ7.0CAHE3_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, precision, and automotive-grade qualification.
The SMAJ series targets compact, high-reliability transient suppression in space-constrained applications such as automotive ECUs, industrial I/O modules, and portable electronics - balancing low profile, AEC-Q101 compliance, and robust 400 W surge handling.
FAQ
What does the "CA" suffix indicate in SMAJ7.0CAHE3_A/H?
The "CA" suffix denotes a bidirectional configuration, meaning the SMAJ7.0CAHE3_A/H provides symmetrical clamping in both polarities - essential for protecting AC-coupled or differential signal lines like RS-485, CAN, or USB without polarity concerns. Unlike unidirectional "A" variants, it has no cathode band marking and conducts identically in forward and reverse bias above VBR.
Is SMAJ7.0CAHE3_A/H compatible with lead-free reflow processes?
Yes, SMAJ7.0CAHE3_A/H is fully compatible with lead-free reflow soldering. It meets MSL Level 1 per J-STD-020 with a maximum peak temperature of 260 °C, allowing direct placement into standard Pb-free reflow profiles without pre-baking or special handling - confirmed by Vishay's qualification testing and JEDEC-compliant terminal plating.
How does the clamping voltage of SMAJ7.0CAHE3_A/H compare to its breakdown voltage?
The SMAJ7.0CAHE3_A/H has a VBR range of 7.78 V to 8.60 V at 10 mA and a maximum clamping voltage VC of 12.0 V at 33.3 A. This yields a clamping ratio (VC/VBR) of approximately 1.55, indicating efficient voltage limiting with minimal overvoltage overshoot - critical for safeguarding 5 V logic rails where sustained >12 V could cause permanent damage.
Can SMAJ7.0CAHE3_A/H be used in place of a unidirectional TVS like SMAJ7.0AHE3_A/H?
No - SMAJ7.0CAHE3_A/H is not a drop-in replacement for unidirectional SMAJ7.0AHE3_A/H. While both share identical VWM, VBR, and VC ratings, the CA version lacks polarity marking and conducts in both directions, making it unsuitable for DC-biased single-ended lines where reverse conduction would short the circuit. Use only where bidirectional protection is explicitly required.
What is the maximum allowable printed circuit board pad size for optimal thermal performance of SMAJ7.0CAHE3_A/H?
Vishay specifies that the 400 W peak pulse power rating for SMAJ7.0CAHE3_A/H is validated using 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad size lowers thermal mass and increases junction temperature during surge events, potentially degrading clamping consistency and long-term reliability - so maintain minimum recommended pad dimensions for full specification compliance.
SMAJ7.0CAHE3_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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ7.0CAHE3_A/H FAQ
1.How can I place an order for SMAJ7.0CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0CAHE3_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 SMAJ7.0CAHE3_A/H reliable?
The price and inventory of SMAJ7.0CAHE3_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 SMAJ7.0CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ7.0CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0CAHE3_A/H?
SMAJ7.0CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0CAHE3_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 SMAJ7.0CAHE3_A/H?
For technical support, including SMAJ7.0CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ7.0CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0CAHE3_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 SMAJ7.0CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ7.0CAHE3_A/H?
All SMAJ7.0CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0CAHE3_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 SMAJ7.0CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ7.0CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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