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Vishay General Semiconductor - Diodes Division SMAJ6.5CA-E3/61
- Part No.:
- SMAJ6.5CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ6.5CA-E3/61.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ6.5CA-E3/61 from Vishay General Semiconductor is a bidirectional 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 6.5 V stand-off voltage (VWM), 7.22–7.98 V breakdown voltage (VBR) at 10 mA, 400 W peak pulse power (10/1000 μs), clamping voltage of 11.2 V at 35.7 A, and operates across –55 °C to +150 °C junction temperature.
For engineers reviewing the SMAJ6.5CA-E3/61 datasheet, SMAJ6.5CA-E3/61 pinout, SMAJ6.5CA-E3/61 application, or SMAJ6.5CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.72), AEC-Q101 qualification eligibility (via HE3 suffix), RoHS-compliant matte tin plating, and compatibility with automated SMT placement on consumer, automotive, and industrial PCBs.
Technical Context
This bidirectional TVS diode functions as a voltage-clamped shunt protector: during transient overvoltage events exceeding VWM, it avalanches symmetrically in both directions to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<500 μA at VWM), while the low incremental surge resistance enables effective energy absorption without thermal runaway.
The device complies with ANSI/IEEE C62.35 for transient suppressor definitions and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow peak. Its 120 °C/W junction-to-ambient thermal resistance requires minimum 0.2" × 0.2" copper pads per terminal for rated 400 W pulse handling - derated linearly above 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 6.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR (min/max) | 7.22 V / 7.98 V at 10 mA - Confirmed breakdown threshold range; ensures reliable turn-on within spec under production tolerance. |
| VC @ IPPM | 11.2 V at 35.7 A - Clamped voltage during 400 W (10/1000 μs) surge; determines maximum stress imposed on protected ICs. |
| PPPM | 400 W - Peak pulse power rating; defines transient energy-handling capacity for standard lightning/surge waveforms. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); relevant only for unidirectional variants; not applicable to SMAJ6.5CA-E3/61. |
| TJ Range | –55 °C to +150 °C - Full operational junction temperature range; supports under-hood automotive and industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 2.54 mm lead pitch; compatible with JEDEC MS-013AC footprint. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity-unmarked for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive polarity event) | One terminal of symmetrical avalanche junction; accepts surge current in either direction relative to cathode. |
| Cathode | Transient current entry (negative polarity event) | Second terminal of symmetrical junction; completes bidirectional conduction path; no band marking on SMAJ6.5CA-E3/61. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 400 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 Level 4 surge immunity requirements when properly mounted on 5 mm × 5 mm copper pads. |
| Low clamping ratio (VC/VWM = 1.72) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio suppressors, improving system robustness. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without moisture sensitivity limitations or baking requirements. |
| AEC-Q101 qualification path | Base P/NHE3 variant available - enables use in automotive powertrain and body electronics requiring qualified components. |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Line Protection |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceiver inputs and sensor signal lines (e.g., pressure, temperature) from load-dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed directly at connector or IC pin to limit transient voltage before it reaches transceiver input stages. Use Value: Prevents latch-up or permanent damage to 5 V or 3.3 V transceivers by clamping surges to ≤11.2 V, maintaining signal integrity during ISO 7637-2 pulse 1/2/5a. |
Use Scenario: Safeguarding differential CAN H/L lines in factory automation controllers against cable-induced surges and ground bounce. IC Role / Device Role / Timing Role: Paired SMAJ6.5CA-E3/61 devices (one per line) provide symmetrical clamping referenced to common-mode ground. Use Value: Maintains CAN bus fault tolerance by limiting differential and common-mode overvoltages without disrupting 1 Mbps data timing or DC bias levels. |
| Consumer USB Port ESD Protection | Telecom DSL Line Surge Suppression |
|
Use Scenario: Secondary-level protection for USB 2.0 D+/D− lines in set-top boxes and smart displays exposed to user-accessible ports. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 300 pF at 0 V) placed after primary polymer-based ESD suppressor to handle high-energy events. Use Value: Absorbs >15 kV contact ESD (IEC 61000-4-2) and 400 W lightning surges (IEC 61000-4-5) without degrading 480 Mbps signal rise time. |
Use Scenario: Front-end protection of ADSL/VDSL line drivers and receivers in residential gateways subjected to induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Bidirectional clamp installed between transformer secondary and PHY IC to suppress longitudinal mode transients. Use Value: Limits surge-induced voltage across PHY pins to <12 V, preventing damage to 3.3 V analog front-end circuits while preserving DSL signal fidelity up to 30 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ6.5CA-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package; same thermal and surge ratings. | No functional difference; selected where halogen-free materials are mandated by OEM environmental policy. | Choose SMAJ6.5CA-M3/61 when compliance with IPC-1752A halogen-free reporting is required. |
| SMAJ6.5CAHE3_A/61 | AEC-Q101 qualified version; includes extended reliability testing (HTOL, TC, UHAST); otherwise identical VWM, VC, and PPPM. | Required for automotive powertrain, chassis, and ADAS modules where component qualification is mandatory. | Specify SMAJ6.5CAHE3_A/61 for automotive designs needing formal AEC-Q101 certification documentation. |
Compared with SMAJ6.5CA-E3/61, the M3 variant adds halogen-free compliance without performance trade-offs, while the HE3 variant delivers full AEC-Q101 qualification - enabling drop-in use in commercial systems or certified deployment in automotive safety-critical domains.
Availability
SMAJ6.5CA-E3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, consumer USB port protection, and telecom DSL line protection requiring stable component supply and consistent surge performance across production batches.
Supply support for SMAJ6.5CA-E3/61 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, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in space-constrained surface-mount applications, targeting automotive, industrial, and communications systems where robustness against lightning, ESD, and inductive switching surges is critical.
FAQ
What is the clamping voltage of SMAJ6.5CA-E3/61 at its rated peak pulse current?
The SMAJ6.5CA-E3/61 has a maximum clamping voltage (VC) of 11.2 V at its peak pulse current (IPPM) of 35.7 A, measured using the standardized 10/1000 μs waveform. This value is confirmed in the Vishay datasheet Document Number 88390, Table "ELECTRICAL CHARACTERISTICS", row for SMAJ6.5CA. The clamping voltage defines the upper voltage limit imposed on protected circuitry during surge events and is critical for ensuring downstream ICs remain within absolute maximum ratings. SMAJ6.5CA-E3/61 maintains this performance across its full operating temperature range.
Is SMAJ6.5CA-E3/61 suitable for automotive applications?
SMAJ6.5CA-E3/61 itself is not AEC-Q101 qualified, but Vishay offers the functionally identical SMAJ6.5CAHE3_A/61 variant with full AEC-Q101 qualification including HTOL, temperature cycling, and unbiased HAST testing. The base SMAJ6.5CA-E3/61 meets MSL Level 1 and uses RoHS-compliant matte tin plating, making it suitable for non-safety-critical automotive infotainment or body electronics where qualification is not mandated. For powertrain or ADAS systems, SMAJ6.5CAHE3_A/61 must be specified. SMAJ6.5CA-E3/61 remains a valid choice for commercial-grade automotive subsystems requiring cost-effective, high-reliability TVS protection.
What is the standoff voltage (VWM) and why is it important for SMAJ6.5CA-E3/61?
The standoff voltage (VWM) of SMAJ6.5CA-E3/61 is 6.5 V - the maximum DC or continuous peak reverse voltage the device can withstand without entering avalanche conduction. This parameter ensures the TVS remains non-conductive during normal circuit operation, minimizing leakage current (<500 μA) and avoiding interference with signal integrity or power rail stability. Selecting a VWM correctly above the system's maximum operating voltage (e.g., 5 V logic rails or 6.0 V sensor supplies) prevents false triggering while retaining sufficient margin for transients. SMAJ6.5CA-E3/61's 6.5 V VWM makes it ideal for protecting 5 V interfaces with headroom for ripple and tolerance.
Does SMAJ6.5CA-E3/61 have polarity markings on the package?
No, SMAJ6.5CA-E3/61 does not have polarity markings on its SMA (DO-214AC) package. As a bidirectional TVS diode, it features symmetrical avalanche characteristics in both directions and therefore omits the cathode band used on unidirectional variants like SMAJ6.5A-E3/61. This absence of marking is explicitly stated in the Vishay datasheet under "MECHANICAL DATA": "no marking on bidirectional types". Designers must rely on footprint orientation and schematic symbol polarity (if used) rather than physical markings - confirming correct placement during layout and assembly verification. SMAJ6.5CA-E3/61's bidirectional nature eliminates risk of reverse installation in AC or floating applications.
What is the thermal resistance and how does it affect SMAJ6.5CA-E3/61's surge capability?
SMAJ6.5CA-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value directly limits its ability to dissipate heat generated during repetitive surge events: higher RθJA means greater junction temperature rise per watt, reducing safe surge repetition rate. For single-event 400 W pulses, thermal mass dominates; however, for duty cycles above 0.01 %, derating per Figure 2 in the Vishay datasheet applies. Proper PCB copper area is essential - undersized pads increase RθJA and risk thermal failure. SMAJ6.5CA-E3/61's RθJA is validated only with the specified pad layout.
SMAJ6.5CA-E3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ6.5CA-E3/61 FAQ
1.How can I place an order for SMAJ6.5CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ6.5CA-E3/61 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 SMAJ6.5CA-E3/61 reliable?
The price and inventory of SMAJ6.5CA-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ6.5CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ6.5CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ6.5CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ6.5CA-E3/61?
SMAJ6.5CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ6.5CA-E3/61 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 SMAJ6.5CA-E3/61?
For technical support, including SMAJ6.5CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ6.5CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ6.5CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ6.5CA-E3/61 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 SMAJ6.5CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ6.5CA-E3/61?
All SMAJ6.5CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ6.5CA-E3/61, 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 SMAJ6.5CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ6.5CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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