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Vishay General Semiconductor - Diodes Division SMAJ6.5CA-M3/5A
- Part No.:
- SMAJ6.5CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ6.5CA-M3/5A.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,222
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Product details
Overview
SMAJ6.5CA-M3/5A 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 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), and clamps to ≤11.2 V at 35.7 A peak surge current - ideal for protecting I/O ports and sensor interfaces in automotive ECUs.
For engineers reviewing the SMAJ6.5CA-M3/5A datasheet, SMAJ6.5CA-M3/5A pinout, SMAJ6.5CA-M3/5A application, or SMAJ6.5CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance (M3 suffix), and AEC-Q101 qualification readiness via HM3 variant.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA construction, enabling protection of AC-coupled or differential signal lines without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<500 μA at VWM), while the low incremental surge resistance supports fast clamping response under transient stress.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its 10/1000 μs waveform rating applies up to 400 W below 78 V; above that threshold, derating to 300 W applies per Vishay specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 6.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range. |
| VBR (min/max) | 7.22 V / 7.98 V at 10 mA - Confirmed breakdown window ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | ≤11.2 V at 35.7 A - Clamped voltage under full-rated surge, limiting downstream IC stress to safe levels. |
| PPPM | 400 W (10/1000 μs) - Peak transient energy absorption capacity for common lightning/inductive-spike waveforms. |
| ID @ VWM | ≤500 μA - Low leakage preserves signal integrity and battery life in always-on circuits. |
| TJ max | 150 °C - Enables operation in under-hood automotive and industrial environments with high ambient temperatures. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline compatible with automated assembly and IPC-7351B footprints. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 compliant (peak reflow 260 °C), UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | One side of symmetrical bidirectional junction; no polarity marking required for CA devices. |
| Cathode | Terminal K | Other side of symmetrical bidirectional junction; electrically identical to Anode in CA configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC, differential, or floating signal lines without external polarity management. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) when properly laid out on 5 mm × 5 mm copper pads. |
| Halogen-free & RoHS-compliant (M3) | Meets global environmental regulations and JESD201 Class 2 whisker resistance for long-term reliability. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during transients, reducing risk of latch-up or gate oxide damage in protected ICs. |
| AEC-Q101 qualification path | HM3 variant available - supports automotive-grade deployment in body control modules and ADAS sensor interfaces. |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Line Protection |
|---|---|
|
Use Scenario: Protecting analog outputs of pressure/temperature sensors in engine control units exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across sensor output and ground to shunt ESD and switching transients. Use Value: Maintains signal fidelity below 6.5 V while clamping spikes to ≤11.2 V, preventing ADC saturation and microcontroller reset. |
Use Scenario: Safeguarding CAN_H/CAN_L differential pair against EFT bursts and ISO 7637-2 pulses in factory automation nodes. IC Role / Device Role / Timing Role: Two SMAJ6.5CA-M3/5A devices used in back-to-back configuration between CAN_H–GND and CAN_L–GND. Use Value: Symmetric clamping ensures equal protection on both lines without disrupting differential signaling integrity or common-mode range. |
| Consumer USB Port ESD Protection | Telecom DSL Line Surge Suppression |
|
Use Scenario: Shielding USB 2.0 D+/D− lines in set-top boxes from human-body-model (HBM) ESD events up to ±15 kV. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector pins to intercept fast-rising ESD strikes before reaching PHY IC. Use Value: Sub-100 pF junction capacitance (typ.) avoids signal degradation at 480 Mbps, while 11.2 V clamping prevents PHY latch-up. |
Use Scenario: Front-end protection of ADSL/VDSL line drivers against lightning-induced surges on twisted-pair telecom lines. IC Role / Device Role / Timing Role: Primary surge limiter mounted at line interface, upstream of gas discharge tube (GDT) secondary protection. Use Value: 400 W rating handles multi-kA induced currents; bidirectional symmetry matches AC-coupled DSL signal structure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ6.5CA-E3/5A | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Acceptable for commercial-grade designs where halogen-free requirement is not mandated. | Select E3 for cost-sensitive non-automotive applications; M3 required for automotive or green procurement policies. |
| SMBJ6.5CA-M3 | Same VWM/VBR/VC, but SMB (DO-214AA) package - 25 % larger footprint and higher PPPM (600 W). | Better suited for higher-energy threats (e.g., ISO 16750-2 Pulse 5a); requires PCB layout change. | Choose SMBJ6.5CA-M3 only if surge margin exceeds 400 W requirement and board space permits larger package. |
Compared with SMAJ6.5CA-E3/5A, the M3 variant adds halogen-free compliance without performance trade-offs; versus SMBJ6.5CA-M3, it offers identical protection in a smaller footprint but with lower absolute surge handling - making SMAJ6.5CA-M3/5A optimal for space-constrained, environmentally regulated designs.
Availability
SMAJ6.5CA-M3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, consumer USB ports, and telecom DSL line protection requiring stable component supply and halogen-free compliance.
Supply support for SMAJ6.5CA-M3/5A 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMAJ series targets robust, standardized transient protection for automotive, industrial, and communications systems - engineered for high-volume SMT assembly and compliance with AEC-Q101, RoHS, and UL safety standards.
FAQ
What does the "CA" suffix indicate in SMAJ6.5CA-M3/5A?
The "CA" suffix denotes a bidirectional configuration, meaning SMAJ6.5CA-M3/5A provides symmetrical transient suppression in both polarities. Unlike unidirectional "A" variants, it has no cathode band marking and functions identically across either terminal orientation - essential for protecting AC-coupled or differential signal paths without polarity constraints.
Is SMAJ6.5CA-M3/5A qualified for automotive use?
SMAJ6.5CA-M3/5A itself is commercial-grade, but Vishay offers the HM3 variant (e.g., SMAJ6.5CA-HM3/5A) which is fully AEC-Q101 qualified. The M3 suffix confirms halogen-free RoHS compliance and JESD201 Class 2 whisker resistance - critical prerequisites for automotive qualification - and enables drop-in replacement into HM3-qualified designs when paired with appropriate validation.
How does the clamping voltage of SMAJ6.5CA-M3/5A compare to its standoff voltage?
SMAJ6.5CA-M3/5A has a 6.5 V standoff voltage (VWM) and clamps to a maximum of 11.2 V at its rated 35.7 A surge current. This 4.7 V headroom ensures normal circuit operation below 6.5 V while limiting transient overshoot to a safe level for 3.3 V or 5 V logic interfaces - a clamping ratio of ~1.72x VWM, consistent with high-performance TVS diodes in the SMAJ family.
Can SMAJ6.5CA-M3/5A be used in place of a unidirectional TVS like SMAJ6.5A-M3/5A?
No - SMAJ6.5CA-M3/5A is strictly bidirectional and lacks polarity marking, whereas SMAJ6.5A-M3/5A is unidirectional with a cathode band. Substituting them requires verifying circuit topology: SMAJ6.5CA-M3/5A suits AC, differential, or floating lines; SMAJ6.5A-M3/5A is mandatory for DC-biased rails where reverse conduction must be blocked. Interchange risks unintended conduction or ineffective clamping.
What is the thermal resistance and power derating behavior of SMAJ6.5CA-M3/5A?
SMAJ6.5CA-M3/5A has a typical RθJA of 120 °C/W on standard 0.2" × 0.2" copper pads. Its 400 W peak pulse rating applies only at TA = 25 °C and derates linearly above that - e.g., at 85 °C ambient, usable pulse power drops to ~240 W. Continuous power dissipation remains limited to 3.3 W, so sustained overvoltage conditions require additional thermal design or upstream current limiting.
SMAJ6.5CA-M3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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-M3/5A FAQ
1.How can I place an order for SMAJ6.5CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ6.5CA-M3/5A 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 SMAJ6.5CA-M3/5A reliable?
The price and inventory of SMAJ6.5CA-M3/5A 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-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ6.5CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ6.5CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ6.5CA-M3/5A?
SMAJ6.5CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ6.5CA-M3/5A 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 SMAJ6.5CA-M3/5A?
For technical support, including SMAJ6.5CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ6.5CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ6.5CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ6.5CA-M3/5A 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 SMAJ6.5CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ6.5CA-M3/5A?
All SMAJ6.5CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ6.5CA-M3/5A, 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 SMAJ6.5CA-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ6.5CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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