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Vishay General Semiconductor - Diodes Division SMAJ7.0CAHE3/5A
- Part No.:
- SMAJ7.0CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0CAHE3/5A.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,407
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Product details
Overview
SMAJ7.0CAHE3/5A 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 test current, and clamps to ≤12.0 V at 33.3 A peak pulse current (IPPM) under 10/1000 μs waveform - ideal for protecting automotive sensor interfaces and industrial I/O circuits.
For engineers reviewing the SMAJ7.0CAHE3/5A datasheet, SMAJ7.0CAHE3/5A pinout, SMAJ7.0CAHE3/5A application, or SMAJ7.0CAHE3/5A equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 400 W peak pulse power rating, low clamping ratio (VC/VBR ≈ 1.55), and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche behavior in both directions, enabling robust surge suppression without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMA package supports high thermal dissipation via low RθJL (30 °C/W).
The SMAJ7.0CAHE3/5A is rated for 400 W peak pulse power (10/1000 μs), derated to 300 W above 78 V, and exhibits ≤1.0 μA reverse leakage at VWM - critical for low-power sensor line protection. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive underhood and body electronics applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 5 V–7 V logic/sensor rails. |
| VBR min/max | 7.78 V / 8.60 V at IT = 10 mA - tight breakdown tolerance ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 12.0 V at 33.3 A - clamping voltage limits downstream IC stress during ESD or load-switching transients. |
| PPPM | 400 W (10/1000 μs) - sustains high-energy surges common in automotive ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 tests. |
| ID @ VWM | ≤1.0 μA - ultra-low leakage preserves signal integrity and battery life in always-on sensor nodes. |
| TJ max | +150 °C - enables deployment in under-hood automotive environments and industrial enclosures without derating. |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per AEC standard. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, unmarked bidirectional configuration - no cathode band; terminals are matte tin-plated for solderability per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current in either polarity; connects to protected line (e.g., CAN_H, LIN, sensor output). |
| Cathode | Transient current exit (bidirectional) | Completes low-impedance path to ground or return rail during clamping; symmetric with Anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, audio) without polarity concerns. |
| 400 W peak pulse power | Withstands repetitive 10/1000 μs surges up to 33.3 A - sufficient for ISO 7637-2 Pulse 5a (50 Ω source) in 12 V systems. |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock - eliminates requalification effort. |
| Low clamping ratio (VC/VBR ≈ 1.55) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio TVS devices, improving system-level robustness. |
| MSL Level 1 | Allows unlimited floor life and lead-free reflow up to 260 °C peak - compatible with standard SMT production lines. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting analog/digital outputs of pressure, temperature, or position sensors in engine control modules and ADAS ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp on sensor supply or signal lines exposed to load-dump and inductive kickback. Use Value: Limits transient voltage to ≤12.0 V, preventing latch-up or damage to 3.3 V/5 V sensor interface ICs while maintaining <1.0 μA leakage at 7.0 V operation. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V industrial field devices subject to relay contact bounce and motor switching noise. IC Role / Device Role / Timing Role: Fast-acting shunt protector placed between input terminal and ground to divert surge energy before reaching optocoupler or microcontroller GPIO. Use Value: Clamps 33.3 A transients within nanoseconds, preserving signal fidelity and enabling reliable detection of true logic transitions amid electrical noise. |
| Automotive LIN Bus Node | Consumer Appliance Motor Control |
|
Use Scenario: Protecting LIN transceiver pins (LIN_H/L) against ESD and battery transients in door modules, seat controls, and HVAC actuators. IC Role / Device Role / Timing Role: Symmetrical TVS placed across LIN bus differential pair to suppress common-mode and differential-mode surges. Use Value: Maintains LIN signal integrity with ≤12.0 V clamping and <1.0 μA leakage, ensuring compliance with LIN 2.2A physical layer timing and voltage thresholds. |
Use Scenario: Shielding microcontroller GPIOs and gate drivers in washing machine, dishwasher, or HVAC blower motor control boards from commutation spikes. IC Role / Device Role / Timing Role: Low-leakage bidirectional clamp on motor driver enable or feedback lines to prevent false triggering or reset events. Use Value: Withstands 400 W pulses without degradation, enabling long-term reliability in high-cycle consumer appliances with minimal board space overhead. |
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-E3/5A | No AEC-Q101 qualification; commercial-grade only; identical electrical specs and package. | Suitable for non-automotive industrial or consumer designs where automotive reliability certification is not required. | Select when cost sensitivity outweighs automotive qualification needs and full traceability is not mandated. |
| SMBJ7.0CAHE3/5A | Same VWM/VBR/VC specs but in larger SMB (DO-214AA) package; higher 600 W PPPM rating and lower RθJA (90 °C/W). | Better thermal performance for high-duty-cycle or high-ambient-temperature deployments; requires larger PCB footprint. | Choose when surge energy exceeds 400 W or ambient temperature exceeds 105 °C, and board space permits SMB layout. |
Compared with SMAJ7.0CA-E3/5A, the SMAJ7.0CAHE3/5A adds AEC-Q101 qualification for automotive use without electrical trade-offs; versus SMBJ7.0CAHE3/5A, it trades 200 W pulse power headroom and thermal margin for compact SMA footprint - optimal for space-constrained automotive modules.
Availability
SMAJ7.0CAHE3/5A is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and consumer appliance motor control requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ7.0CAHE3/5A 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and computing systems - delivering consistent clamping performance across temperature, lifetime, and surge repetition rate.
FAQ
What is the clamping voltage of SMAJ7.0CAHE3/5A at its rated peak pulse current?
The SMAJ7.0CAHE3/5A clamps to a maximum of 12.0 V at its rated peak pulse current of 33.3 A under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and reflects worst-case voltage seen by downstream circuitry during surge events - a critical parameter for ensuring compatibility with 3.3 V or 5 V ICs protected by the SMAJ7.0CAHE3/5A.
Is SMAJ7.0CAHE3/5A suitable for automotive applications?
Yes, SMAJ7.0CAHE3/5A is AEC-Q101 qualified and specifically intended for automotive use, including engine control units, body electronics, and ADAS sensor modules. The HE3 suffix denotes RoHS-compliant and AEC-Q101 qualified construction, validated for temperature cycling, humidity bias, and mechanical shock - making SMAJ7.0CAHE3/5A appropriate for under-hood and cabin environments up to +150 °C junction temperature.
How does the bidirectional design of SMAJ7.0CAHE3/5A affect its circuit placement?
The bidirectional design of SMAJ7.0CAHE3/5A means it has no polarity marking and can be placed across any two points needing symmetrical surge protection - such as differential signal pairs (CAN_H/CAN_L), AC-coupled lines, or floating sensor outputs. Unlike unidirectional TVS diodes, SMAJ7.0CAHE3/5A does not require orientation verification during placement, simplifying layout and reducing assembly errors in high-volume SMT production.
What is the maximum reverse leakage current of SMAJ7.0CAHE3/5A at its stand-off voltage?
The SMAJ7.0CAHE3/5A exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 7.0 V stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage ensures minimal power loss and signal distortion in battery-powered or high-impedance sensor circuits - a key advantage over higher-leakage alternatives that could compromise accuracy or standby current budgets in systems using SMAJ7.0CAHE3/5A.
Does SMAJ7.0CAHE3/5A require special PCB layout considerations for thermal performance?
Yes - for optimal thermal performance, SMAJ7.0CAHE3/5A should be mounted on minimum recommended pad layout: 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per Vishay's datasheet. This layout achieves the specified RθJA of 120 °C/W and supports full 400 W pulse power rating; smaller pads will increase junction temperature and reduce surge endurance. The SMAJ7.0CAHE3/5A's RθJL of 30 °C/W further emphasizes the need for solid thermal connection to internal ground/power planes.
SMAJ7.0CAHE3/5A 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ7.0CAHE3/5A FAQ
1.How can I place an order for SMAJ7.0CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0CAHE3/5A 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 SMAJ7.0CAHE3/5A reliable?
The price and inventory of SMAJ7.0CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.0CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ7.0CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0CAHE3/5A?
SMAJ7.0CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0CAHE3/5A 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 SMAJ7.0CAHE3/5A?
For technical support, including SMAJ7.0CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ7.0CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0CAHE3/5A 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 SMAJ7.0CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ7.0CAHE3/5A?
All SMAJ7.0CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0CAHE3/5A, 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 SMAJ7.0CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ7.0CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.0CAHE3/5A Tags
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