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Vishay General Semiconductor - Diodes Division SMAJ6.5CAHM3/H
- Part No.:
- SMAJ6.5CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ6.5CAHM3/H.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ6.5CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping ESD and surge transients on signal/power lines. It features 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 (10/1000 μs waveform), used to protect MOSFET gates, sensor interfaces, and automotive control modules.
For engineers reviewing the SMAJ6.5CAHM3/H datasheet, SMAJ6.5CAHM3/H pinout, SMAJ6.5CAHM3/H application, or SMAJ6.5CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at VWM), but switches to low-impedance conduction within <1 ns when transient voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance across temperature.
The SMAJ6.5CAHM3/H is rated for repetitive 10/1000 μs surges at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above), with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W - enabling reliable operation in ambient temperatures from –55 °C to +150 °C without forced cooling on standard PCB layouts.
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 - guaranteed breakdown range ensuring consistent turn-on across production lots. |
| VC @ IPPM | 11.2 V at 35.7 A - clamping voltage during worst-case 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W (10/1000 μs) - peak transient energy absorption capacity; supports IEC 61000-4-5 Level 4 surge immunity. |
| ID @ VWM | 500 μA - reverse leakage at stand-off voltage; low enough to avoid loading sensitive analog or logic inputs. |
| TJ max. | +150 °C - maximum junction temperature; enables use in under-hood automotive environments and industrial enclosures. |
| Package | SMA (DO-214AC) - surface-mount outline with 0.208" × 0.157" footprint; compatible with standard reflow profiles and J-STD-020 MSL Level 1. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity-unmarked for bidirectional operation; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (during positive half-cycle) | Conducts surge current toward ground when voltage exceeds +VBR; symmetric with cathode in bidirectional mode. |
| Cathode | Transient current entry (during negative half-cycle) | Conducts surge current toward ground when voltage exceeds –VBR; functionally identical to anode due to bidirectional symmetry. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Equal VBR and VC performance in both polarities - eliminates need for polarity-aware layout or orientation verification during assembly. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, body electronics, and ADAS sensor protection. |
| Halogen-free & RoHS-compliant | HM3 suffix denotes full compliance with JEDEC J-STD-201 Class 2 whisker resistance and EU RoHS Directive 2011/65/EU - supports green manufacturing requirements. |
| 400 W peak pulse power | Withstands 10/1000 μs transients up to 35.7 A - meets IEC 61000-4-5 surge immunity for industrial and telecom equipment. |
| Fast response time | <1 ns turn-on - limits voltage overshoot during fast-rising ESD events (IEC 61000-4-2) before downstream ICs are damaged. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role: Bidirectional shunt clamp placed between signal line and chassis ground, absorbing transients before they reach the transceiver input stage. Use Value: Prevents latch-up or permanent damage to automotive-grade transceivers by limiting clamped voltage to ≤11.2 V during 35.7 A surges. |
Use Scenario: Shielding digital input/output channels of programmable logic controllers from inductive kickback and lightning-induced surges in factory automation systems. IC Role / Device Role: Primary overvoltage clamp on 24 V DC I/O lines, mounted directly at connector entry point with minimal trace length. Use Value: Maintains system uptime by surviving repeated 400 W surges without degradation, verified per AEC-Q101 stress tests. |
| Consumer USB Interface Protection | Telecom Power Rail Clamping |
|
Use Scenario: Safeguarding USB 2.0 data lines (D+/D−) against ESD events during hot-plug insertion in set-top boxes and smart displays. IC Role / Device Role: Low-capacitance bidirectional TVS placed adjacent to USB connector, referenced to common-mode ground. Use Value: Limits ESD-induced voltage to ≤11.2 V while adding only ~20 pF capacitance - preserves signal integrity up to 480 Mbps. |
Use Scenario: Clamping 48 V telecom power rails (e.g., PoE injectors) against lightning-induced surges entering via Ethernet cables. IC Role / Device Role: Secondary surge suppression stage after primary GDT or MOV, providing precise low-voltage clamping near powered ICs. Use Value: Enables compact design with 400 W dissipation in SMA package - avoids need for larger DO-214AB or SMC devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ6.5CAHE3/H | Same electrical specs, but RoHS-compliant without halogen-free certification; uses E3 suffix instead of HM3. | Approved for commercial/industrial use but not automotive AEC-Q101; lacks halogen-free documentation for strict green procurement. | Select SMAJ6.5CAHE3/H if AEC-Q101 qualification is unnecessary and halogen-free material is not mandated. |
| SMBJ6.5CAHM3 | Same VWM/VBR/VC ratings, but SMB (DO-214AA) package - 25 % larger footprint and higher thermal mass (RθJA = 90 °C/W). | Better power handling margin for high-repetition surges; requires larger PCB area and different pad layout. | Choose SMBJ6.5CAHM3 where sustained surge duty cycles exceed 0.01 % or board space permits larger package. |
Compared with SMAJ6.5CAHE3/H, the SMAJ6.5CAHM3/H adds halogen-free compliance and AEC-Q101 qualification without sacrificing clamping performance; versus SMBJ6.5CAHM3, it trades thermal robustness for compactness - making it optimal for space-constrained automotive and portable designs.
Availability
SMAJ6.5CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and consumer USB interface safeguarding requiring stable component supply across long-lifecycle programs.
Supply support for SMAJ6.5CAHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMAJ series was engineered for high-reliability transient suppression in automotive, industrial, and telecom systems - delivering consistent clamping performance across temperature, lifetime, and surge repetition rates.
FAQ
What does the "HM3" suffix indicate in SMAJ6.5CAHM3/H?
The "HM3" suffix in SMAJ6.5CAHM3/H specifies halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance and AEC-Q101 qualification. It confirms the device meets automotive-grade reliability standards and environmental compliance for green manufacturing - distinct from E3 (RoHS only) or HE3 (AEC-Q101 + RoHS, but not halogen-free). This makes SMAJ6.5CAHM3/H appropriate for under-hood and safety-critical applications where material content and long-term stability are mandated.
Is SMAJ6.5CAHM3/H suitable for protecting USB 2.0 differential pairs?
Yes, SMAJ6.5CAHM3/H is suitable for USB 2.0 differential pair protection due to its bidirectional clamping, low 11.2 V clamping voltage at 35.7 A, and typical junction capacitance of ~20 pF at 1 MHz - low enough to avoid signal integrity degradation at 480 Mbps. Its SMA package allows placement directly at the USB connector with minimal stub length, and the AEC-Q101 qualification ensures robustness against repeated ESD events per IEC 61000-4-2. Designers should verify layout parasitics and ensure grounding to maintain common-mode rejection.
How does the clamping performance of SMAJ6.5CAHM3/H compare to unidirectional variants like SMAJ6.5A?
SMAJ6.5CAHM3/H provides symmetrical clamping in both directions - identical VBR (7.22–7.98 V), VC (11.2 V), and IPPM (35.7 A) for positive and negative transients - unlike unidirectional SMAJ6.5A, which conducts only in reverse bias and requires correct polarity orientation. This eliminates risk of misassembly and simplifies layout for AC-coupled or floating signal lines. However, SMAJ6.5A offers slightly lower forward voltage drop (VF = 3.5 V at 25 A) in forward conduction - irrelevant for SMAJ6.5CAHM3/H since it blocks in both directions below VBR.
Can SMAJ6.5CAHM3/H be used in parallel to increase surge current handling?
No, SMAJ6.5CAHM3/H should not be used in parallel to increase surge current handling due to inherent parameter variation - even within the same reel, VBR tolerances (±8.5 %) cause uneven current sharing, leading to thermal runaway in one device. For higher IPPM requirements, select a single higher-rated device (e.g., SMBJ6.5CAHM3 with 58.1 A) or implement external current-sharing resistors - though this degrades clamping speed and adds board area. Vishay does not characterize or guarantee parallel operation for SMAJ6.5CAHM3/H.
What is the maximum recommended PCB copper pad size for SMAJ6.5CAHM3/H to achieve rated 400 W power dissipation?
To achieve the full 400 W peak pulse power rating, SMAJ6.5CAHM3/H must be mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet (Document Number: 88390, page 1). Smaller pads reduce thermal spreading and cause premature thermal failure during repetitive surges. For single-pulse applications, minimum recommended pads are still 0.157" × 0.157", but derating applies above TA = 25 °C per Figure 2. Always verify layout with thermal simulation when operating near limits.
SMAJ6.5CAHM3/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:
- -
- 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:
- 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)
SMAJ6.5CAHM3/H FAQ
1.How can I place an order for SMAJ6.5CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ6.5CAHM3/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 SMAJ6.5CAHM3/H reliable?
The price and inventory of SMAJ6.5CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ6.5CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ6.5CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ6.5CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ6.5CAHM3/H?
SMAJ6.5CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ6.5CAHM3/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 SMAJ6.5CAHM3/H?
For technical support, including SMAJ6.5CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ6.5CAHM3/H requirements.
6.How does Aetrix verify that SMAJ6.5CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ6.5CAHM3/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 SMAJ6.5CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ6.5CAHM3/H?
All SMAJ6.5CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ6.5CAHM3/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 SMAJ6.5CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ6.5CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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