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Vishay General Semiconductor - Diodes Division SMAJ6.5AHM3/H
- Part No.:
- SMAJ6.5AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ6.5AHM3/H.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,913
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Product details
Overview
SMAJ6.5AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping 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, 400 W peak pulse power (10/1000 μs), and clamps to ≤11.2 V at 35.7 A peak surge current - ideal for protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ6.5AHM3/H datasheet, SMAJ6.5AHM3/H pinout, SMAJ6.5AHM3/H application, or SMAJ6.5AHM3/H equivalent, key selection criteria include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, low clamping ratio (VC/VBR ≈ 1.45), and MSL Level 1 reflow capability up to 260 °C - critical for high-reliability automotive PCB designs requiring robust ESD and load-dump protection.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction for fast response (<1 ps) and stable avalanche behavior under repetitive transients. Its thermal resistance (RθJA = 120 °C/W) and junction-to-lead resistance (RθJL = 30 °C/W) are specified for 0.2" × 0.2" copper pads, enabling predictable thermal performance in compact layouts.
The SMAJ6.5AHM3/H delivers 400 W peak pulse power only up to 78 V VWM; above that threshold, rating drops to 300 W. Its maximum reverse leakage is 500 μA at 6.5 V, and temperature coefficient of VBR is +0.061 %/°C - ensuring predictable voltage drift across -55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 6.5 V - Maximum continuous reverse voltage before significant leakage; sets operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 7.22–7.98 V at 10 mA - Guaranteed avalanche initiation range; defines minimum overvoltage threshold for protection activation. |
| VC (Clamping Voltage) | ≤11.2 V at 35.7 A IPPM - Peak voltage seen by protected circuit during 10/1000 μs transient; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Energy-handling capacity for single transient events; derates above 78 V and with temperature rise. |
| IPPM (Peak Pulse Current) | 35.7 A - Maximum surge current supported before clamping exceeds 11.2 V; used to size PCB trace width and layout. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments without derating. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 2.54 mm lead pitch; compatible with automated placement and reflow. |
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. Cathode identified by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., ground or return path); not active during normal reverse-biased TVS operation. |
| Cathode | Current exit terminal during forward conduction; marked with band | Connected to protected line (e.g., 6.5 V rail); avalanche conduction occurs from cathode to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental standards and supports lead-free assembly without compromising thermal or electrical reliability. |
| 400 W peak pulse power (10/1000 μs) | Handles ISO 7637-2 Pulse 1 (inductive switch-off) and IEC 61000-4-5 surge events without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on protected ICs compared to higher-ratio suppressors, improving system-level immunity margin. |
| Fast response time (<1 ps) | Activates before most semiconductor damage thresholds are exceeded, providing effective protection against ESD and fast transients. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 5–12 V power rails in engine control modules from load-dump transients (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between supply rail and ground, activated within picoseconds of overvoltage onset. Use Value: Limits rail voltage to ≤11.2 V during 35.7 A surges, preventing latch-up or gate oxide rupture in microcontrollers and power drivers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal line and ground, suppressing transients before reaching ADC input stages. Use Value: Maintains signal integrity with <500 μA leakage at 6.5 V, avoiding DC offset errors while clamping ±15 kV contact ESD per IEC 61000-4-2. |
| Consumer USB Port Protection | Telecom Line Interface Protection |
Use Scenario: Safeguarding USB VBUS lines in portable chargers and docking stations against hot-plug surges and AC coupling faults. IC Role / Device Role / Timing Role: Standoff-rated TVS placed inline with 5 V supply, conducting only during overvoltage excursions exceeding 6.5 V. Use Value: Withstands 400 W pulses without failure, enabling compliance with USB-IF surge immunity requirements while preserving low standby current. |
Use Scenario: Protecting RS-485 transceiver inputs in telecom base station backplanes from lightning-induced surges on long-distance wiring. IC Role / Device Role / Timing Role: Primary clamping element on differential bus lines, coordinated with secondary GDT or MOV stages. Use Value: Provides precise 6.5 V standoff and 11.2 V clamping to avoid false triggering of receivers while limiting energy delivered to transceiver ESD structures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ6.5AHE3/H | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification; same VWM, VBR, and clamping specs. | Approved for commercial-grade automotive modules where halogen-free and full AEC-Q101 are not mandated. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 validation is optional. |
| SMAJ6.5A-M3/61 | Same halogen-free RoHS compliance and electrical specs; differs only in packaging (61 = 7" tape/reel, 1800 pcs) vs. H (7" tape/reel, unspecified quantity). | No functional difference; identical use in production assembly lines requiring standard reel formats. | Choose for compatibility with existing pick-and-place feeders configured for 61-code reels. |
Compared with SMAJ6.5AHM3/H, the HE3/H variant trades halogen-free construction and AEC-Q101 qualification for lower cost in non-automotive settings, while the M3/61 offers identical performance with standardized reel logistics - making HM3/H optimal for Tier-1 automotive suppliers needing full compliance traceability.
Availability
SMAJ6.5AHM3/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and consumer USB port surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMAJ6.5AHM3/H 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, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SMAJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping performance and long-term stability are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ6.5AHM3/H under rated surge conditions?
The SMAJ6.5AHM3/H clamps to a maximum of 11.2 V when subjected to its rated peak pulse current of 35.7 A (10/1000 μs waveform). This value is measured at the device terminals under standardized test conditions with 0.2" × 0.2" copper pads, and represents the highest voltage the protected circuit will experience during a defined transient event. The SMAJ6.5AHM3/H maintains this clamping performance across its full operating temperature range.
Is SMAJ6.5AHM3/H qualified for automotive applications?
Yes, the SMAJ6.5AHM3/H is AEC-Q101 qualified, as indicated by the "HM3" suffix - denoting halogen-free, RoHS-compliant, and automotive-grade qualification. It has passed stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing, making it suitable for under-hood and chassis-mounted automotive electronics where reliability under thermal and mechanical stress is critical. The SMAJ6.5AHM3/H meets these requirements without derating.
How does the SMAJ6.5AHM3/H differ from the SMAJ6.5A-E3/61 variant?
The SMAJ6.5AHM3/H differs from SMAJ6.5A-E3/61 in three key aspects: it is halogen-free (vs. standard RoHS), AEC-Q101 qualified (vs. commercial grade), and uses the "H" reel packaging code (vs. "61"). Electrically, both share identical VWM (6.5 V), VBR (7.22–7.98 V), and clamping performance. The SMAJ6.5AHM3/H is intended for automotive Tier-1 applications requiring full compliance documentation, whereas the E3/61 serves cost-sensitive commercial designs.
What is the thermal resistance of SMAJ6.5AHM3/H, and how does it affect PCB layout?
The SMAJ6.5AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value assumes minimal copper area; increasing pad size or adding thermal vias reduces RθJA and improves power handling. For reliable 400 W pulse operation, designers must ensure adequate copper pour and avoid narrow traces near the SMAJ6.5AHM3/H terminals to prevent localized heating and premature failure.
Can SMAJ6.5AHM3/H be used in bidirectional configurations?
No, SMAJ6.5AHM3/H is a unidirectional TVS diode, as confirmed by its part number suffix "A" (not "CA") and cathode-band marking. It conducts only in reverse avalanche mode and blocks forward current beyond ~3.5 V. For bidirectional protection - such as AC signal lines or differential buses - a separate SMAJ6.5CA variant must be selected. Using SMAJ6.5AHM3/H in bidirectional circuits risks forward conduction and improper clamping behavior.
SMAJ6.5AHM3/H 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ6.5AHM3/H FAQ
1.How can I place an order for SMAJ6.5AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ6.5AHM3/H 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 SMAJ6.5AHM3/H reliable?
The price and inventory of SMAJ6.5AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ6.5AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ6.5AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ6.5AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ6.5AHM3/H?
SMAJ6.5AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ6.5AHM3/H 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 SMAJ6.5AHM3/H?
For technical support, including SMAJ6.5AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ6.5AHM3/H requirements.
6.How does Aetrix verify that SMAJ6.5AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ6.5AHM3/H 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 SMAJ6.5AHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ6.5AHM3/H?
All SMAJ6.5AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ6.5AHM3/H, 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 SMAJ6.5AHM3/H part is unused and in its original packaging.
Return procedure for SMAJ6.5AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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