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Vishay General Semiconductor - Diodes Division SMAJ7.5CAHM3/I
- Part No.:
- SMAJ7.5CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5CAHM3/I.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,889
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Product details
Overview
SMAJ7.5CAHM3/I 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 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ7.5CAHM3/I datasheet, SMAJ7.5CAHM3/I pinout, SMAJ7.5CAHM3/I application, or SMAJ7.5CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 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 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 (<100 μA at VWM), while the low incremental surge resistance supports fast energy diversion during ESD or lightning-induced surges.
The device is rated for repetitive 10/1000 μs transients at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), requiring minimal PCB copper area for reliable operation under transient stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 5 V–12 V rail protection. |
| VBR min/max | 8.33 V / 9.21 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 12.9 V at 31.0 A - Clamped voltage during worst-case 10/1000 μs surge; guarantees downstream ICs see ≤12.9 V stress. |
| PPPM | 400 W - Peak pulse power handling with standard 10/1000 μs waveform; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge testing. |
| ID @ VWM | ≤100 μA - Reverse leakage at stand-off voltage; low enough to avoid signal integrity degradation on high-impedance sensor lines. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments and industrial enclosures. |
| MSL Level | Level 1 per J-STD-020 - No floor life limitation; supports standard reflow without baking prior to assembly. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); cathode band omitted (bidirectional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (either polarity) | One terminal of symmetrical PN junction; accepts surge current regardless of voltage polarity relative to other terminal. |
| Cathode | Transient current exit (either polarity) | Second terminal of symmetrical PN junction; completes low-impedance path to ground or rail during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without polarity constraints. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces per stress test requirements. |
| Halogen-free & RoHS | Meets environmental compliance for global OEM programs; HM3 suffix confirms halogen-free molding compound and matte tin terminations. |
| 400 W peak pulse power | Handles IEC 61000-4-5 combination wave surges (1 kV open-circuit / 0.5 kΩ source impedance) without degradation over lifetime. |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes let-through voltage during transients - critical for protecting 3.3 V and 5 V logic with tight absolute maximum ratings. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between sensor output and microcontroller ADC input to limit voltage excursions to ≤12.9 V. Use Value: Prevents ADC saturation and latch-up during 100 V/50 ms load dump events while maintaining <100 μA leakage at 7.5 V nominal rail. |
Use Scenario: Shielding 24 V digital input channels on programmable logic controller (PLC) backplanes from field-wiring induced transients. IC Role / Device Role / Timing Role: Parallel-connected TVS on each input channel to shunt surge energy before reaching optocoupler input stage. Use Value: Ensures immunity to IEC 61000-4-4 EFT bursts (4 kV) and IEC 61000-4-5 surges (2 kV) without degrading 1 ms response time of input circuitry. |
| USB Port ESD Protection | DC Power Rail Clamp |
|
Use Scenario: Safeguarding USB 2.0 data lines (D+/D−) against contact ESD per IEC 61000-4-2 ±15 kV air / ±8 kV contact discharge. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed differentially across D+ and D− to suppress common-mode transients without signal distortion. Use Value: Clamps ESD events within <1 ns while adding <15 pF capacitance - preserving USB 2.0 eye diagram integrity up to 480 Mbps. |
Use Scenario: Secondary overvoltage clamp on 12 V DC power distribution net feeding infotainment head units and telematics modules. IC Role / Device Role / Timing Role: Standby TVS connected between rail and chassis ground to absorb residual transients escaping primary DC-DC converter protection. Use Value: Limits rail voltage to 12.9 V during 400 W surge events, preventing damage to downstream LDOs and PMICs rated for 16 V absolute maximum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5CAHE3/I | Same electrical specs, but RoHS-compliant with standard brominated flame retardant (not halogen-free); lacks HM3 halogen-free certification. | Suitable for commercial/industrial designs where halogen-free requirement is not mandated by end-customer spec. | Select when cost sensitivity outweighs halogen-free compliance; identical footprint and solder profile. |
| SMBJ7.5CAHM3/I | Same VWM/VBR/VC, but SMB (DO-214AA) package - 30% larger footprint, higher thermal mass, 600 W PPPM rating. | Better suited for high-energy surge environments (e.g., outdoor telecom power inputs) where 400 W is marginal. | Choose when board space allows larger package and higher surge margin is required; not drop-in due to different pad layout. |
Compared with SMAJ7.5CAHM3/I, SMAJ7.5CAHE3/I offers identical performance without halogen-free assurance, while SMBJ7.5CAHM3/I delivers higher surge robustness in a non-compatible footprint - making SMAJ7.5CAHM3/I optimal for space-constrained AEC-Q101 automotive designs needing halogen-free compliance.
Availability
SMAJ7.5CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, USB port protection, and 12 V DC power rail clamping requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMAJ7.5CAHM3/I 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, automotive qualification, and high-volume manufacturability.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, low clamping voltage, and automated assembly compatibility are mandatory.
FAQ
What does the "CA" suffix indicate in SMAJ7.5CAHM3/I?
The "CA" suffix denotes a bidirectional configuration, meaning SMAJ7.5CAHM3/I functions identically in both polarities - ideal for protecting AC-coupled signals, differential buses, or ungrounded power rails without polarity concerns. Unlike unidirectional "A" variants, it has no cathode marking and exhibits matched VBR in either direction, as confirmed in Vishay's Electrical Characteristics table for SMAJ7.5CAHM3/I.
Is SMAJ7.5CAHM3/I qualified for automotive use?
Yes, SMAJ7.5CAHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). This certification validates its reliability under automotive stress conditions including temperature cycling, humidity bias, and mechanical shock - making it suitable for engine control, body electronics, and ADAS sensor protection per Vishay's ordering information and Mechanical Data section.
What is the maximum clamping voltage of SMAJ7.5CAHM3/I during a surge event?
The maximum clamping voltage (VC) of SMAJ7.5CAHM3/I is 12.9 V at 31.0 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured under standardized test conditions and guarantees that downstream components experience no more than 12.9 V during worst-case transient events - critical for safeguarding 3.3 V and 5 V logic circuits with tight absolute maximum voltage limits.
How does the HM3 suffix differ from E3 or M3 in SMAJ7.5CAHM3/I?
The "HM3" suffix in SMAJ7.5CAHM3/I specifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinct from "E3" (RoHS-compliant, commercial grade, no halogen-free claim) and "M3" (halogen-free + RoHS, commercial grade only). HM3 ensures compliance with automotive OEM material declarations and supports use in safety-critical vehicle subsystems where halogen content and qualification status are audited.
Can SMAJ7.5CAHM3/I be used in place of SMAJ7.5A in a design?
No - SMAJ7.5CAHM3/I is bidirectional, whereas SMAJ7.5A is unidirectional with a cathode band and asymmetric conduction. Substituting them requires verifying circuit topology: SMAJ7.5CAHM3/I suits AC/differential lines or floating rails, while SMAJ7.5A is limited to DC rails with defined polarity. The clamping behavior, leakage, and PCB layout (no marking vs. cathode band) differ, so direct replacement is not recommended without schematic and layout review for SMAJ7.5CAHM3/I.
SMAJ7.5CAHM3/I 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/I FAQ
1.How can I place an order for SMAJ7.5CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5CAHM3/I 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/I reliable?
The price and inventory of SMAJ7.5CAHM3/I 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/I is usually 5 days.
3.What payment methods are accepted for SMAJ7.5CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5CAHM3/I?
SMAJ7.5CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5CAHM3/I 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/I?
For technical support, including SMAJ7.5CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5CAHM3/I requirements.
6.How does Aetrix verify that SMAJ7.5CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5CAHM3/I 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/I meets industry standards.
7.What is the process for return or replacement of SMAJ7.5CAHM3/I?
All SMAJ7.5CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5CAHM3/I, 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/I part is unused and in its original packaging.
Return procedure for SMAJ7.5CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5CAHM3/I Tags
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