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Vishay General Semiconductor - Diodes Division SMAJ7.0AHE3/5A
- Part No.:
- SMAJ7.0AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0AHE3/5A.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,858
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Product details
Overview
SMAJ7.0AHE3/5A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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, and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMAJ7.0AHE3/5A datasheet, SMAJ7.0AHE3/5A pinout, SMAJ7.0AHE3/5A application, or SMAJ7.0AHE3/5A equivalent, key selection considerations include its AEC-Q101 qualification for automotive use, low incremental surge resistance, fast response time, and compatibility with automated SMT placement on consumer, industrial, and automotive PCBs.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction for stable avalanche behavior under transient overvoltage events. Its thermal resistance (RθJA = 120 °C/W) and junction temperature range (−55 °C to +150 °C) support reliable operation in compact, thermally constrained layouts.
The device delivers precise clamping performance: at IPPM = 33.3 A (10/1000 μs), VC ≤ 12.0 V ensures robust protection of downstream 5 V logic interfaces, MOSFET gate drivers, and sensor signal lines without exceeding safe voltage thresholds during surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse operating voltage; ensures no conduction during normal 5 V system operation. |
| VBR (min/max) | 7.78 V / 8.60 V at 10 mA - Confirmed avalanche onset range; guarantees reliable triggering above nominal rail. |
| VC @ IPPM | 12.0 V at 33.3 A - Clamped voltage during 400 W transient; protects 5 V ICs with margin below absolute max ratings. |
| PPPM | 400 W (10/1000 μs) - Peak surge energy handling capacity; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) testing. |
| IFSM | 40 A (8.3 ms half-sine) - Surge current withstand for power supply line transients; supports input-stage protection. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and high-temperature industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized 2-pin SMD outline; compatible with IPC-7351B footprint and J-STD-020 reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. MSL Level 1 (260 °C peak reflow), RoHS-compliant and AEC-Q101 qualified. Cathode identified by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected circuit ground or low-side return path; enables clamping to reference plane. |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., 5 V rail); absorbs surge energy into ground when VIN exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22-A114. |
| 400 W peak pulse power | Handles IEC 61000-4-5 combination wave surges up to 1 kV without degradation in standard PCB layout. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes let-through voltage during transients-critical for safeguarding 5 V microcontrollers and USB PHYs. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term leakage stability (<1 μA at VWM) across life cycle. |
| MSL Level 1 compliance | Enables direct placement without dry-pack or baking; supports high-volume automated assembly with zero moisture sensitivity risk. |
Applications
| Automotive Body Control Module | Industrial PLC Digital Input |
|---|---|
|
Use Scenario: Protecting LIN bus interface and power supply inputs from load dump and alternator ripple in BCMs. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between 5 V rail and chassis ground. Use Value: Limits transient overshoot to ≤12.0 V during 12 V system load dump events, preserving MCU and transceiver integrity. |
Use Scenario: Shielding 24 V digital input channels from inductive kickback caused by relay/solenoid switching. IC Role / Device Role / Timing Role: Standoff-rated TVS on signal line before optocoupler input stage. Use Value: Clamps 24 V line spikes to <15 V within nanoseconds, preventing false triggering and opto-isolator damage. |
| USB-C Power Delivery Port | Automotive Camera Sensor Interface |
|
Use Scenario: Safeguarding VBUS and CC lines against ESD and hot-plug surges in portable docking stations. IC Role / Device Role / Timing Role: Low-capacitance TVS on 5 V VBUS path adjacent to USB PD controller. Use Value: Delivers 30 kV contact ESD protection (IEC 61000-4-2) while maintaining signal integrity via minimal parasitic capacitance. |
Use Scenario: Guarding MIPI CSI-2 data lines and 1.8 V/3.3 V bias rails in ADAS camera modules exposed to EMC stress. IC Role / Device Role / Timing Role: Rail-to-rail TVS on sensor power and I²C control lines near connector entry point. Use Value: Suppresses coupled transients from nearby radar or motor noise without distorting high-speed video signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0A-E3/5A | Same electrical specs and AEC-Q101 qualification; differs only in packaging suffix (E3 vs HE3) and halogen content. | No functional difference; both rated for automotive and industrial use. | Select SMAJ7.0AHE3/5A when halogen-free compliance is required per customer specification. |
| SMBJ7.0AHE3/5A | Higher 600 W PPPM, larger SMB (DO-214AA) package, same VWM/VC specs. | Better suited for higher-energy surge environments (e.g., 48 V battery systems) where board space allows larger footprint. | Choose SMBJ7.0AHE3/5A only if surge threat level exceeds 400 W and PCB layout accommodates 2.5 mm wider body. |
Compared with SMAJ7.0AHE3/5A, the E3 variant offers identical protection performance but lacks AEC-Q101 validation, while SMBJ7.0AHE3/5A trades compactness for higher surge margin-making SMAJ7.0AHE3/5A optimal for space-constrained, automotive-qualified 5 V rail protection.
Availability
SMAJ7.0AHE3/5A is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, USB-C peripheral protection, and telecom power interface designs requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ7.0AHE3/5A 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, TVS devices, and power MOSFETs with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and computing applications-delivering consistent clamping performance under repetitive surge stress and extended temperature operation.
FAQ
What is the clamping voltage of SMAJ7.0AHE3/5A at its rated peak pulse current?
The SMAJ7.0AHE3/5A has a maximum clamping voltage (VC) of 12.0 V at its rated peak pulse current (IPPM) of 33.3 A with a 10/1000 μs waveform. This value is measured under standardized test conditions and ensures predictable overvoltage limiting for 5 V circuits. The SMAJ7.0AHE3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ7.0AHE3/5A suitable for automotive applications?
Yes, SMAJ7.0AHE3/5A is AEC-Q101 qualified and specifically designed for automotive use, including body electronics, infotainment, and ADAS subsystems. Its construction meets automotive reliability requirements such as temperature cycling, high-temperature reverse bias, and mechanical shock. The SMAJ7.0AHE3/5A carries the "HE3" suffix denoting RoHS-compliant and AEC-Q101 qualified status.
How does the breakdown voltage range of SMAJ7.0AHE3/5A compare to its stand-off voltage?
The SMAJ7.0AHE3/5A has a minimum breakdown voltage (VBR) of 7.78 V and maximum of 8.60 V at 10 mA test current, while its stand-off voltage (VWM) is 7.0 V. This 0.78–1.60 V margin ensures the device remains non-conductive during normal operation yet triggers reliably during transients. The SMAJ7.0AHE3/5A's VBR/VWM ratio is typical for unidirectional TVS diodes targeting 5 V system protection.
What is the thermal resistance of SMAJ7.0AHE3/5A, and how does it affect PCB layout?
The SMAJ7.0AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads. This value assumes minimum recommended pad layout per Vishay's DO-214AC guidelines. To maintain safe junction temperatures under repeated surges, designers should use adequate copper area and avoid excessive trace length. The SMAJ7.0AHE3/5A's thermal performance directly impacts sustained surge duty cycle capability.
Does SMAJ7.0AHE3/5A have polarity marking, and how is it identified?
Yes, SMAJ7.0AHE3/5A is a unidirectional TVS diode with polarity marking: a cathode band is printed on the device body adjacent to the cathode terminal. During PCB layout, the banded end must connect to the line being protected (e.g., 5 V rail), while the anode connects to ground. This orientation ensures proper clamping action. The SMAJ7.0AHE3/5A's polarity is critical-reverse installation renders it ineffective for overvoltage suppression.
SMAJ7.0AHE3/5A 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ7.0AHE3/5A FAQ
1.How can I place an order for SMAJ7.0AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0AHE3/5A 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 SMAJ7.0AHE3/5A reliable?
The price and inventory of SMAJ7.0AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.0AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ7.0AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0AHE3/5A?
SMAJ7.0AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0AHE3/5A 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 SMAJ7.0AHE3/5A?
For technical support, including SMAJ7.0AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0AHE3/5A requirements.
6.How does Aetrix verify that SMAJ7.0AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0AHE3/5A 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 SMAJ7.0AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ7.0AHE3/5A?
All SMAJ7.0AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0AHE3/5A, 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 SMAJ7.0AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ7.0AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.0AHE3/5A Tags
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