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Vishay General Semiconductor - Diodes Division SMAJ6.5AHE3/61
- Part No.:
- SMAJ6.5AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ6.5AHE3/61.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ6.5AHE3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 6.5 V stand-off voltage (VWM), 7.22–7.98 V breakdown voltage (VBR) at 10 mA test current, and clamps transients to ≤11.2 V at 35.7 A peak pulse current (IPPM) under 10/1000 μs waveform - ideal for safeguarding power rails and I/O lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ6.5AHE3/61 datasheet, SMAJ6.5AHE3/61 pinout, SMAJ6.5AHE3/61 application, or SMAJ6.5AHE3/61 equivalent, key selection criteria include its AEC-Q101 qualification, 400 W peak pulse power rating (10/1000 μs), low clamping ratio (VC/VBR ≈ 1.48), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, conducting only when reverse voltage exceeds VBR to divert surge energy away from downstream components. Its glass-passivated junction ensures stable leakage performance (<500 μA at VWM) and fast response time (<1.0 ps), critical for suppressing ESD and inductive switching spikes.
The SMAJ6.5AHE3/61 is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports continuous power dissipation of 3.3 W at 50 °C ambient, and exhibits a thermal resistance of 120 °C/W (junction-to-ambient) on minimum recommended copper pads - enabling reliable operation in compact, thermally constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 6.5 V - maximum continuous reverse operating voltage before significant conduction begins; sets threshold for normal circuit operation without leakage interference. |
| VBR (Breakdown Voltage) | 7.22–7.98 V at 10 mA - guaranteed voltage range where device enters avalanche conduction; defines precise clamping onset point. |
| VC (Clamping Voltage) | ≤11.2 V at IPPM = 35.7 A - maximum voltage seen by protected circuit during 10/1000 μs surge; determines stress level on downstream ICs. |
| PPPM (Peak Pulse Power) | 400 W - surge energy handling capability under standardized 10/1000 μs waveform; validates protection against common lightning and load-dump events. |
| ID (Reverse Leakage) | ≤500 μA at VWM - minimal standby current that avoids signal integrity degradation or battery drain in always-on systems. |
| TJ max. | +150 °C - maximum junction temperature rating; enables use in under-hood automotive environments and high-temperature industrial enclosures. |
| AEC-Q101 Qualified | Yes - certified for automotive-grade reliability per JESD22-A108, including temperature cycling, HTRB, and ESD testing; required for engine control, ADAS, and body electronics. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge return path / clamping node | Connected to protected line (e.g., 5 V rail); conducts avalanche current to ground during overvoltage event. |
| Anode (unbanded end) | Reference / ground reference | Typically tied to system ground or low-impedance return plane; completes clamping path and establishes VWM reference. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Validates protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges without derating. |
| AEC-Q101 qualified (HE3 suffix) | Confirms suitability for automotive applications requiring zero-failure field reliability across temperature, humidity, and vibration stress profiles. |
| Low clamping ratio (VC/VBR ≈ 1.48) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs and microcontrollers. |
| MSL Level 1 (JEDEC J-STD-020) | Enables direct placement without baking or moisture-sensitive handling; compatible with standard reflow profiles up to 260 °C peak. |
| Glass-passivated junction | Ensures long-term stability of VBR and ID parameters under thermal cycling and humidity exposure - critical for 15+ year automotive service life. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 5 V supply lines in engine control units (ECUs) from load-dump transients and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VCC and GND to clamp positive-going surges above 6.5 V while remaining inert during nominal operation. Use Value: Limits transient voltage to ≤11.2 V, preventing damage to 5 V-rated MCUs and CAN transceivers without affecting steady-state regulation. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Parallel-connected clamping device on signal line to shunt ESD and inductive kickback from solenoid actuators. Use Value: Sub-1 ns response time and <500 μA leakage ensure no signal offset or noise injection during normal 20 mA operation. |
| Consumer USB Port ESD Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Adding secondary-level ESD protection on VBUS line of USB 2.0 ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing ±8 kV contact discharge (IEC 61000-4-2) before internal USB PHY reaches failure threshold. Use Value: Clamping voltage ≤11.2 V prevents latch-up in USB switch ICs rated for 5.5 V absolute maximum, preserving data integrity. |
Use Scenario: Front-end surge protection on Ethernet PHY power rails (3.3 V) in DSLAM line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping element in multi-stage protection scheme, handling bulk energy before TVS arrays and GDTs. Use Value: 400 W rating and 120 °C/W RθJA allow sustained operation in densely packed telecom chassis without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ6.5A-E3/61 | Commercial-grade version; same electrical specs but not AEC-Q101 qualified; RoHS-compliant, MSL Level 1. | Lacks automotive qualification; suitable for consumer, industrial, and telecom equipment where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and qualification documentation is not required. |
| SMAJ6.5CAHE3/61 | Bidirectional variant; symmetric VBR (7.22–7.98 V) and VC (11.2 V) in both directions; same package and AEC-Q101 rating. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus) where negative transients must also be suppressed. | Choose only when bidirectional protection is needed; unidirectional SMAJ6.5AHE3/61 offers lower capacitance and tighter leakage in DC-only applications. |
Compared with SMAJ6.5A-E3/61, the SMAJ6.5AHE3/61 adds automotive qualification without sacrificing electrical performance, while SMAJ6.5CAHE3/61 extends protection symmetry at the cost of slightly higher junction capacitance - making SMAJ6.5AHE3/61 optimal for cost-constrained, high-reliability DC power rail protection.
Availability
SMAJ6.5AHE3/61 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor modules, consumer USB power delivery, and telecom line card designs requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMAJ6.5AHE3/61 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 optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was developed specifically for high-energy transient suppression in automotive, industrial, and communications systems - balancing low clamping voltage, fast response, and rugged packaging for harsh-environment deployment.
FAQ
What is the clamping voltage of the SMAJ6.5AHE3/61 under a 10/1000 μs surge?
The SMAJ6.5AHE3/61 has a maximum clamping voltage (VC) of 11.2 V at a peak pulse current (IPPM) of 35.7 A under the standardized 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees that protected circuits will not experience voltages exceeding 11.2 V during such transients - a critical parameter for ensuring compatibility with 5 V logic and power ICs. The SMAJ6.5AHE3/61 maintains this performance across its full operating temperature range.
Is the SMAJ6.5AHE3/61 qualified for automotive applications?
Yes, the SMAJ6.5AHE3/61 is explicitly AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in datasheet 88390 (Revision 09-Jan-2024). It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD verification to meet automotive reliability requirements. The SMAJ6.5AHE3/61 is approved for use in engine control, body electronics, and ADAS subsystems where zero-field-failure performance is mandatory.
What is the standoff voltage (VWM) and why does it matter for SMAJ6.5AHE3/61?
The SMAJ6.5AHE3/61 has a standoff voltage (VWM) of 6.5 V - the maximum DC or continuous reverse voltage the device can withstand without entering significant conduction. This parameter ensures minimal leakage (<500 μA) during normal operation, preventing unnecessary power loss or signal distortion in protected circuits. Selecting a VWM just above the system's maximum operating voltage (e.g., 5 V rail → 6.5 V VWM) optimizes margin against false triggering while maintaining robust surge headroom. The SMAJ6.5AHE3/61 achieves this balance with tight VBR tolerance (7.22–7.98 V).
How does the SMAJ6.5AHE3/61 differ from the bidirectional SMAJ6.5CAHE3/61?
The SMAJ6.5AHE3/61 is unidirectional, meaning it protects only against positive-going transients relative to ground, with polarity marked by a cathode band. In contrast, SMAJ6.5CAHE3/61 is bidirectional and symmetrical - suppressing surges of either polarity, making it suitable for AC-coupled or differential lines like RS-485. Both share identical AEC-Q101 qualification, package, and clamping performance, but the SMAJ6.5AHE3/61 offers lower junction capacitance and tighter leakage in DC applications where polarity is fixed.
What PCB layout guidance applies to the SMAJ6.5AHE3/61 for optimal thermal and electrical performance?
For optimal performance, the SMAJ6.5AHE3/61 should be mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay's datasheet for rated 400 W pulse power. Minimizing trace inductance between the device and protected node is essential - place it as close as possible to the connector or IC input. Thermal relief should avoid excessive isolation; the SMAJ6.5AHE3/61 relies on copper area for heat dissipation, with RθJA = 120 °C/W under these conditions. Avoid routing noisy signals near its terminals to prevent coupling.
SMAJ6.5AHE3/61 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):
- 6.5V
- Voltage - Breakdown (Min):
- 7.22V
- Voltage - Clamping (Max) @ Ipp:
- 11.2V
- Current - Peak Pulse (10/1000µs):
- 35.7A
- 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)
SMAJ6.5AHE3/61 FAQ
1.How can I place an order for SMAJ6.5AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ6.5AHE3/61 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 SMAJ6.5AHE3/61 reliable?
The price and inventory of SMAJ6.5AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ6.5AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ6.5AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ6.5AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ6.5AHE3/61?
SMAJ6.5AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ6.5AHE3/61 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 SMAJ6.5AHE3/61?
For technical support, including SMAJ6.5AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ6.5AHE3/61 requirements.
6.How does Aetrix verify that SMAJ6.5AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ6.5AHE3/61 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 SMAJ6.5AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ6.5AHE3/61?
All SMAJ6.5AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ6.5AHE3/61, 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 SMAJ6.5AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ6.5AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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