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Vishay General Semiconductor - Diodes Division SMAJ7.5CAHM3/H
- Part No.:
- SMAJ7.5CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5CAHM3/H.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,457
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Product details
Overview
SMAJ7.5CAHM3/H 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 or power lines. It features a 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1 mA test current, 12.9 V maximum clamping voltage (VC) at 31.0 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMAJ7.5CAHM3/H datasheet, SMAJ7.5CAHM3/H pinout, SMAJ7.5CAHM3/H application, or SMAJ7.5CAHM3/H equivalent, this device is selected for ESD and surge protection in automotive sensor interfaces, industrial I/O lines, and low-voltage DC power rails where bidirectional clamping, AEC-Q101 qualification, and halogen-free RoHS compliance are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling transient suppression without polarity sensitivity-ideal for AC-coupled or floating signal paths. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<100 μA at VWM), while the low incremental surge resistance supports consistent clamping performance under repetitive surges.
The device is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow peak. Its thermal resistance (RθJA = 120 °C/W) reflects standard PCB pad layout (0.2" × 0.2" copper), and it delivers 400 W pulse power up to 78 V, derating to 300 W above that threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 8.33 V / 9.21 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on within tight tolerance for predictable protection timing. |
| VC @ IPPM | 12.9 V at 31.0 A - Clamped voltage during 10/1000 μs surge; limits downstream voltage stress to sub-13 V under worst-case 400 W transient. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 surge immunity testing. |
| ID @ VWM | <100 μA - Reverse leakage at stand-off voltage; minimizes quiescent power loss and avoids false triggering in high-impedance nodes. |
| Package | SMA (DO-214AC) - Standard surface-mount outline with 2.54 mm lead pitch; compatible with automated placement and reflow processes. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking (unlike unidirectional variants which feature cathode band).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts surge current in either direction once VBR is exceeded-no orientation required during placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or floating references without polarity constraints. |
| 400 W peak pulse power (≤78 V) | Withstands IEC 61000-4-5 combination wave surges up to 400 W, supporting Level 4 immunity in industrial and automotive environments. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive under-hood and chassis applications requiring extended temperature operation and long-term reliability. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for green manufacturing and end-of-life recycling without compromising electrical performance. |
| MSL Level 1 moisture sensitivity | Allows indefinite floor life before reflow; eliminates baking requirements and simplifies SMT line logistics. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 transients. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector or IC input pins to limit voltage excursions below IC absolute maximum ratings. Use Value: Maintains signal integrity during 12 V/24 V system transients by clamping to ≤12.9 V, preventing latch-up or damage to downstream ASICs. |
Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges and ESD events in factory automation. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on 24 V DC input lines, positioned before optocoupler or Schmitt trigger input stage. Use Value: Limits transient energy to <400 W with sub-10 ns response, ensuring logic-level compatibility and eliminating need for additional RC filtering. |
| USB/Serial Communication Line | Low-Voltage DC Power Rail |
Use Scenario: ESD and surge protection for RS-232, RS-485, or USB 2.0 data lines in medical or test equipment. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed across differential pairs or single-ended lines near connectors. Use Value: Provides <100 μA leakage at 7.5 V, preserving signal rise/fall times while meeting IEC 61000-4-2 ±15 kV contact discharge requirements. |
Use Scenario: Input-side surge suppression for 5 V or 3.3 V power rails feeding microcontrollers or sensors in embedded systems. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between VCC and GND to shunt overvoltage events before LDO or regulator input. Use Value: Clamps 7.5 V rail to ≤12.9 V during fast transients, preventing brownout resets or internal LDO failure due to overvoltage stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5CAHE3/H | Same electrical specs but RoHS-compliant commercial grade (non-halogen-free); lacks halogen-free certification. | Approved for non-automotive industrial/commercial use where halogen-free mandate does not apply. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not needed. |
| SMBJ7.5CAHM3/H | Same VWM/VBR/VC but in larger SMB (DO-214AA) package; higher thermal mass and 600 W PPPM rating. | Better suited for higher-energy surge environments (e.g., outdoor telecom, motor drives) where PCB space allows. | Choose when system-level surge tests exceed 400 W or board layout permits larger footprint for improved thermal margin. |
Compared with SMAJ7.5CAHE3/H and SMBJ7.5CAHM3/H, the SMAJ7.5CAHM3/H uniquely combines AEC-Q101 qualification, halogen-free construction, and compact SMA footprint-making it optimal for space-constrained automotive and green-industrial designs requiring full compliance and verified reliability.
Availability
SMAJ7.5CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and low-voltage embedded power supplies requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMAJ7.5CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for robust transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where precision clamping, fast response, and long-term stability are critical.
FAQ
What is the clamping voltage of SMAJ7.5CAHM3/H at its rated peak pulse current?
The SMAJ7.5CAHM3/H has a maximum clamping voltage (VC) of 12.9 V at 31.0 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value ensures protected circuits remain below critical voltage thresholds during surge events, and it is confirmed in the Vishay datasheet Document Number 88390, page 2.
Is SMAJ7.5CAHM3/H suitable for automotive applications?
Yes, SMAJ7.5CAHM3/H is AEC-Q101 qualified (indicated by the HM3 suffix), making it suitable for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. Its qualification covers temperature cycling, high-temperature reverse bias, and ESD testing per automotive reliability standards.
Does SMAJ7.5CAHM3/H have polarity markings on the package?
No, SMAJ7.5CAHM3/H is a bidirectional TVS diode and carries no polarity marking on the SMA (DO-214AC) package. Unlike unidirectional variants (e.g., SMAJ7.5A), it functions identically in either orientation-both terminals serve as symmetrical conduction paths during transient events.
What is the maximum reverse leakage current for SMAJ7.5CAHM3/H at its stand-off voltage?
The SMAJ7.5CAHM3/H exhibits a maximum reverse leakage current (ID) of 100 μA at its 7.5 V stand-off voltage (VWM), tested at TA = 25 °C. This low leakage preserves signal integrity in high-impedance circuits and avoids unnecessary power drain in battery-operated systems.
How does the HM3 suffix differ from the HE3 suffix in Vishay's SMAJ series?
The HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction, whereas HE3 indicates RoHS-compliant and AEC-Q101 qualified but not halogen-free. Both meet automotive reliability standards, but HM3 satisfies stricter environmental mandates for halogen-free materials in final assemblies.
SMAJ7.5CAHM3/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):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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)
SMAJ7.5CAHM3/H FAQ
1.How can I place an order for SMAJ7.5CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5CAHM3/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 SMAJ7.5CAHM3/H reliable?
The price and inventory of SMAJ7.5CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ7.5CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5CAHM3/H?
SMAJ7.5CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5CAHM3/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 SMAJ7.5CAHM3/H?
For technical support, including SMAJ7.5CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5CAHM3/H requirements.
6.How does Aetrix verify that SMAJ7.5CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5CAHM3/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 SMAJ7.5CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ7.5CAHM3/H?
All SMAJ7.5CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5CAHM3/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 SMAJ7.5CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ7.5CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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