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Vishay General Semiconductor - Diodes Division SMAJ6.5A-M3/5A
- Part No.:
- SMAJ6.5A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ6.5A-M3/5A.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,739
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Product details
Overview
SMAJ6.5A-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast voltage transients on power and signal lines. It features a 6.5 V stand-off voltage (VWM), 7.22–7.98 V breakdown voltage (VBR) at 10 mA, 11.2 V maximum clamping voltage (VC) at 35.7 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ6.5A-M3/5A datasheet, SMAJ6.5A-M3/5A pinout, SMAJ6.5A-M3/5A application, or SMAJ6.5A-M3/5A equivalent, key selection criteria include clamping performance under 35.7 A surge, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold (VBR), diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage behavior and fast response time (<1 ns), while the SMA package supports high-current handling via low thermal resistance (RθJL = 30 °C/W) and MSL Level 1 reflow compatibility (peak 260 °C).
The SMAJ6.5A-M3/5A is rated for 400 W peak pulse power (10/1000 μs), derated above 25 °C per Fig. 2, with 3.3 W steady-state power dissipation and 40 A non-repetitive forward surge capability. It exhibits +0.061 %/°C temperature coefficient of VBR and ≤500 μA reverse leakage at 6.5 V, meeting ANSI/IEEE C62.35 standards for transient suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 6.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR (min/max) | 7.22 V / 7.98 V at 10 mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction. |
| VC @ IPPM | 11.2 V at 35.7 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - Peak transient energy absorption capacity; validates suitability for IEC 61000-4-5 Level 3/4 surges. |
| ID @ VWM | ≤500 μA - Reverse leakage at stand-off voltage; critical for low-power sensor and battery-backed circuits. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or industrial enclosures. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient on standard PCB pads; informs heatsinking requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads, polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional mode) | Connected to lower-potential side of protected line; conducts during positive transients only if used in reverse-biased configuration. |
| Cathode | Avalanche conduction terminal | Marked end of device; connected to higher-potential rail (e.g., VCC or signal line) to clamp overvoltage to ground or reference. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Supports robust protection against lightning-induced surges and inductive switching spikes in 12 V/24 V systems. |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes voltage overshoot during clamping, reducing stress on downstream 5 V or 3.3 V logic components. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture-related popcorn failure or delamination. |
| Halogen-free & RoHS-compliant (M3) | Fulfills environmental compliance for automotive ECUs and industrial equipment sold in EU, China, and Korea. |
| Fast response time (<1 ns) | Clamps transients before sensitive CMOS inputs or gate drivers experience destructive overvoltage. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails in engine control units (ECUs) from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and local regulator input to clamp transients up to ±100 V. Use Value: Limits clamped voltage to 11.2 V during 35.7 A surge, preventing regulator latch-up and preserving system uptime. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in PLC I/O modules exposed to field wiring noise. IC Role / Device Role / Timing Role: TVS mounted directly at connector entry point to shunt ESD and inductive kickback before signal conditioning circuitry. Use Value: Sub-1 ns response ensures clamping occurs before 3.3 V ADC front-end sustains damage from 8 kV contact ESD events. |
| Consumer USB Port Surge Suppression | Telecom DC Power Input Protection |
Use Scenario: Adding secondary overvoltage protection on VBUS line of USB-C ports in docking stations and monitors. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of USB PD controller to absorb miswired 20 V adapter surges. Use Value: 6.5 V VWM allows clean 5 V operation while clamping 12 V+ faults to 11.2 V, avoiding false disconnects. |
Use Scenario: Protecting -48 V telecom rectifier outputs from lightning-induced common-mode surges on central office power feeds. IC Role / Device Role / Timing Role: Unidirectional TVS configured with cathode to -48 V rail and anode to chassis ground to clamp negative-going transients. Use Value: 400 W rating handles repetitive 10/1000 μs surges per ITU-T K.21 Basic Level, extending power supply MTBF. |
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-E3/5A | Same electrical specs, but RoHS-compliant with brominated flame retardant (non-halogen-free); JEDEC MSL Level 1, same 260 °C peak. | Approved for commercial-grade industrial equipment where halogen-free requirement is not mandated. | Select when cost sensitivity outweighs halogen-free compliance; identical footprint and soldering profile. |
| SMAJ6.5AHE3_A/I | AEC-Q101 qualified version with same VWM/VBR/VC, but enhanced reliability testing (HTOL, TC, UHAST); same M3-equivalent packaging. | Required for automotive powertrain and body electronics subject to OEM qualification protocols. | Choose for automotive designs needing documented qualification evidence; requires same layout but longer lead times. |
Compared with SMAJ6.5A-M3/5A, the E3 variant offers identical protection performance at lower cost for non-automotive use, while the HE3 variant adds AEC-Q101 validation for mission-critical vehicle systems - neither is pin-compatible with bidirectional variants like SMAJ6.5CA.
Availability
SMAJ6.5A-M3/5A is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer USB power delivery systems, and telecom DC input stages requiring stable component supply with halogen-free compliance and SMT manufacturability.
Supply support for SMAJ6.5A-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 performance.
The SMAJ series was developed for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, fast response, and standardized SMT packaging are essential.
FAQ
What is the maximum clamping voltage of the SMAJ6.5A-M3/5A under a 10/1000 μs surge?
The SMAJ6.5A-M3/5A has a maximum clamping voltage (VC) of 11.2 V when subjected to its rated peak pulse current of 35.7 A with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream 5 V or 3.3 V circuitry. The SMAJ6.5A-M3/5A maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Does the SMAJ6.5A-M3/5A meet automotive qualification standards?
The SMAJ6.5A-M3/5A is halogen-free and RoHS-compliant but is not AEC-Q101 qualified. For automotive applications requiring formal qualification, Vishay offers the SMAJ6.5AHE3_A/I variant, which shares identical electrical parameters but includes full AEC-Q101 test documentation. The SMAJ6.5A-M3/5A remains suitable for non-safety-critical automotive subsystems such as infotainment power rails where customer-level validation suffices.
How does the M3 suffix affect the SMAJ6.5A-M3/5A's compliance and processing?
The M3 suffix on SMAJ6.5A-M3/5A indicates halogen-free, RoHS-compliant construction with matte tin-plated leads qualified to JESD 201 Class 2 whisker resistance and J-STD-002 solderability standards. It also meets MSL Level 1 per J-STD-020, allowing unlimited floor life and single-pass 260 °C lead-free reflow. This makes the SMAJ6.5A-M3/5A suitable for high-reliability industrial and export-bound consumer products with strict environmental mandates.
Can the SMAJ6.5A-M3/5A be used in bidirectional protection circuits?
No - the SMAJ6.5A-M3/5A is strictly unidirectional and must be installed with correct polarity (cathode toward the protected line). For bidirectional protection, Vishay specifies the SMAJ6.5CA variant, which has symmetrical breakdown in both directions and no polarity marking. Using SMAJ6.5A-M3/5A in reverse-biased configurations risks permanent damage due to forward conduction during negative transients.
What is the thermal resistance and how does it impact PCB layout for the SMAJ6.5A-M3/5A?
The SMAJ6.5A-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under repeated surges, designers must provide adequate copper area and avoid thermal isolation. Reducing pad size or omitting thermal vias increases RθJA and may cause premature thermal runaway during sustained transient events. The SMAJ6.5A-M3/5A relies on PCB copper for heat dissipation - no external heatsink is feasible due to its SMT form factor.
SMAJ6.5A-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:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ6.5A-M3/5A FAQ
1.How can I place an order for SMAJ6.5A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ6.5A-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 SMAJ6.5A-M3/5A reliable?
The price and inventory of SMAJ6.5A-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 SMAJ6.5A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ6.5A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ6.5A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ6.5A-M3/5A?
SMAJ6.5A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ6.5A-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 SMAJ6.5A-M3/5A?
For technical support, including SMAJ6.5A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ6.5A-M3/5A requirements.
6.How does Aetrix verify that SMAJ6.5A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ6.5A-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 SMAJ6.5A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ6.5A-M3/5A?
All SMAJ6.5A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ6.5A-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 SMAJ6.5A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ6.5A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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