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Vishay General Semiconductor - Diodes Division SMAJ7.5CAHM3_A/I
- Part No.:
- SMAJ7.5CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5CAHM3_A/I.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,387
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Product details
Overview
SMAJ7.5CAHM3_A/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 or power lines. It features 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1 mA test current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the SMAJ7.5CAHM3_A/I datasheet, SMAJ7.5CAHM3_A/I pinout, SMAJ7.5CAHM3_A/I application, or SMAJ7.5CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, low clamping voltage (12.9 V at 31.0 A), thermal resistance (RθJA = 120 °C/W), and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This device operates as a voltage-clamping protection element across two terminals, responding to transient overvoltages in either polarity due to its bidirectional structure. Its glass-passivated junction enables fast response time (<1 ns), low incremental surge resistance, and stable clamping performance under repetitive 10/1000 μs surges at 0.01% duty cycle.
The SMAJ7.5CAHM3_A/I is rated for -55 °C to +150 °C operating junction temperature, with maximum reverse leakage of 100 μA at 7.5 V and clamping voltage of 12.9 V at 31.0 A peak pulse current. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below breakdown. |
| VBR min/max | 8.33 V / 9.21 V at 1 mA - Confirmed breakdown threshold range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 12.9 V at 31.0 A - Clamping voltage under full-rated surge; determines protected circuit's maximum stress during ESD or load-switching events. |
| PPPM | 400 W (10/1000 μs) - Peak pulse power handling capacity; defines transient energy absorption capability without failure. |
| ID @ VWM | 100 μA - Low reverse leakage at stand-off voltage preserves signal integrity and minimizes standby power loss. |
| TJ max | +150 °C - Maximum junction temperature rating supports operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm × 4.50 mm footprint and matte tin-plated leads for automated assembly. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Acts as cathode during positive transients and anode during negative transients; symmetrical conduction enables dual-polarity clamping. |
| Cathode | Transient return path (bidirectional) | Identical functional role to Anode in bidirectional TVS; no physical marking distinguishes terminals - device is electrically symmetric. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per JEDEC standards. |
| Halogen-free & RoHS-compliant | HM3 suffix denotes halogen-free molding compound and lead finish meeting EU RoHS Directive 2011/65/EU and JESD201 Class 2 whisker resistance. |
| 400 W peak pulse power | Supports robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-to-line) when mounted on 5.0 mm × 5.0 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.55) | Ensures minimal overvoltage exposure to downstream components - critical for safeguarding 3.3 V or 5 V logic interfaces. |
| MSL Level 1 | Unlimited floor life at ≤30 °C/85% RH; compatible with standard reflow profiles up to 260 °C peak without preconditioning. |
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 / Timing Role: Bidirectional voltage clamp placed across differential or single-ended signal lines upstream of interface ICs. Use Value: Limits transient voltage to ≤12.9 V during 31 A surges, preventing latch-up or gate oxide damage in 5 V-tolerant transceivers and ADC front-ends. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to inductive kickback from solenoids and contactors. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input rails to shunt switching transients before reaching optocoupler or Schmitt-trigger input stages. Use Value: Absorbs 400 W surge energy without degradation, maintaining system uptime in factory automation where maintenance windows are constrained. |
| Consumer Power Adapter Output | Telecom Ethernet Port Protection |
|
Use Scenario: Secondary-side overvoltage suppression on 5 V/9 V/12 V USB-C PD and wall adapter outputs susceptible to feedback-loop faults or capacitor discharge spikes. IC Role / Device Role / Timing Role: Standoff-clamp device placed between VOUT and GND to limit output rail excursion during fault conditions. Use Value: Fast <1 ns response prevents downstream USB controller or PMIC damage during 10/1000 μs surges exceeding 30 V. |
Use Scenario: Common-mode transient suppression on 10/100/1000BASE-T Ethernet PHY interfaces subjected to lightning-induced surges on unshielded twisted pair cabling. IC Role / Device Role / Timing Role: Paired bidirectional TVS devices across each differential pair (e.g., TX+/TX−, RX+/RX−) in conjunction with common-mode chokes. Use Value: Clamps common-mode surges to <13 V while preserving signal integrity up to 100 MHz - validated per IEC 61000-4-5 Ed. 3. |
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_A/I | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant with standard brominated flame-retardant molding compound (not halogen-free). | Acceptable for commercial/industrial use where halogen-free compliance is not mandated by end-customer or regional regulations. | Select HE3 variant if halogen content restrictions do not apply and cost optimization is prioritized. |
| SMBJ7.5CAHM3_A/I | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 25% larger footprint (4.57 mm × 3.94 mm) and higher thermal resistance (RθJA = 140 °C/W). | Better suited for higher-power derating scenarios or legacy PCB layouts with larger pad spacing; less space-efficient than SMAJ series. | Choose SMBJ only when board layout constraints allow larger package or when higher surge margin beyond 400 W is required (600 W rating). |
Compared with SMAJ7.5CAHM3_A/I, the HE3 variant offers identical protection performance without halogen-free assurance, while the SMBJ7.5CAHM3_A/I trades compactness for enhanced thermal margin and surge headroom - making the SMAJ version optimal for space-constrained AEC-Q101 automotive modules requiring halogen-free compliance.
Availability
SMAJ7.5CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, consumer power adapter outputs, and telecom Ethernet port protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ7.5CAHM3_A/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, efficiency, and application-specific validation.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, low clamping voltage, and halogen-free compliance are mandatory.
FAQ
What does the "HM3" suffix indicate in SMAJ7.5CAHM3_A/I?
The HM3 suffix in SMAJ7.5CAHM3_A/I specifies halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance and MSL Level 1 moisture sensitivity. It confirms compliance with automotive and green electronics requirements, distinguishing it from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS, non-halogen-free) variants of the same SMAJ7.5CAHM3_A/I device.
Is SMAJ7.5CAHM3_A/I suitable for protecting 3.3 V logic circuits?
Yes, SMAJ7.5CAHM3_A/I is appropriate for safeguarding 3.3 V logic circuits when used with proper layout practices - its 7.5 V stand-off voltage provides adequate margin above the 3.3 V rail, and its 12.9 V clamping voltage limits transient overshoot to levels compatible with most 3.3 V tolerant I/O cells. Always verify system-level clamping margin using worst-case surge current and PCB trace inductance.
Does SMAJ7.5CAHM3_A/I require a heatsink for 400 W pulse handling?
No, SMAJ7.5CAHM3_A/I achieves its 400 W peak pulse power rating without external heatsinking when mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Its RθJA of 120 °C/W and short-duration 10/1000 μs pulse ensure junction temperature remains within safe limits during single-event transients - heatsinking is unnecessary for typical surge protection use cases.
How does the bidirectional design of SMAJ7.5CAHM3_A/I affect PCB layout?
The bidirectional design of SMAJ7.5CAHM3_A/I eliminates polarity concerns during placement - no cathode band marking exists, and either terminal may connect to either side of the protected line. This simplifies layout, reduces assembly errors, and enables symmetric placement across differential pairs or AC-coupled signals without orientation checks during automated placement.
Can SMAJ7.5CAHM3_A/I replace SMAJ7.5A in existing designs?
No - SMAJ7.5CAHM3_A/I is bidirectional, whereas SMAJ7.5A is unidirectional with a defined cathode band. Substituting them requires verifying circuit topology: SMAJ7.5CAHM3_A/I can protect AC or floating lines but cannot replace unidirectional TVS in DC-biased applications where forward conduction must be blocked. Always validate clamping behavior under both polarities before interchange.
SMAJ7.5CAHM3_A/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:
- Active
- 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_A/I FAQ
1.How can I place an order for SMAJ7.5CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5CAHM3_A/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_A/I reliable?
The price and inventory of SMAJ7.5CAHM3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ7.5CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5CAHM3_A/I?
SMAJ7.5CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5CAHM3_A/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_A/I?
For technical support, including SMAJ7.5CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ7.5CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5CAHM3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ7.5CAHM3_A/I?
All SMAJ7.5CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5CAHM3_A/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_A/I part is unused and in its original packaging.
Return procedure for SMAJ7.5CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5CAHM3_A/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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