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Vishay General Semiconductor - Diodes Division SMAJ75CAHM3_A/I
- Part No.:
- SMAJ75CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75CAHM3_A/I.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,432
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Product details
Overview
SMAJ75CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 75 V standoff voltage (VWM), 83.3–92.1 V breakdown voltage (VBR) at 1 mA, 121 V maximum clamping voltage (VC) at 3.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ75CAHM3_A/I datasheet, SMAJ75CAHM3_A/I pinout, SMAJ75CAHM3_A/I application, or SMAJ75CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a silicon avalanche diode optimized for fast transient suppression in both polarities. Its bidirectional structure eliminates polarity sensitivity in AC-coupled or floating lines, and its glass-passivated junction ensures stable breakdown characteristics over temperature (TC of VBR = 0.106 %/°C). The 120 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design per Vishay's recommended 0.2" × 0.2" layout.
Rated for repetitive 0.01% duty cycle surges, it delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold. It meets J-STD-020 MSL Level 1 (260 °C peak reflow) and supports automotive-grade reliability via AEC-Q101 qualification - confirmed by HM3 suffix and ordering code "_A/I" denoting halogen-free, RoHS-compliant, AEC-Q101 qualified version in 13" tape-and-reel packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 83.3 V / 92.1 V at 1 mA - guaranteed avalanche initiation range under standardized test conditions |
| VC @ IPPM | 121 V at 3.3 A - clamped voltage during 10/1000 μs surge, defining worst-case overvoltage seen by protected circuit |
| PPPM | 400 W - peak transient energy absorption capacity with 10/1000 μs waveform, derated above 78 V |
| ID @ VWM | 1.0 μA - leakage current at rated standoff voltage, critical for low-power sensor line protection |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 120 °C/W - thermal resistance requiring minimum 5.0 mm × 5.0 mm copper pads per terminal for safe power dissipation |
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 absent - bidirectional symmetry means no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Conducts during negative voltage excursions; connects to line being protected |
| Cathode | Transient current entry (positive half-cycle) | Conducts during positive voltage excursions; connects to line being protected |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC, differential, or floating signal/power rails without polarity concerns |
| AEC-Q101 qualification | Validated for automotive electronics including engine control units and body modules requiring extended temperature and life-cycle reliability |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surge events (4 kV/2 Ω) when properly mounted on specified copper pads |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without moisture-induced damage, eliminating bake requirements pre-assembly |
| Glass passivated junction | Ensures stable VBR and low leakage across -55 °C to +150 °C, critical for industrial outdoor deployments |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamping high-energy spikes before they reach downstream DC-DC converters and microcontrollers. Use Value: Limits voltage to ≤121 V during 3.3 A surge, preventing latch-up or gate oxide rupture in 3.3 V/5 V logic interfaces. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) from ESD and inductive switching noise in factory automation. IC Role / Device Role / Timing Role: Fast-response shunt element absorbing sub-100 ns transients induced by relay coil de-energization. Use Value: 1.0 μA leakage at 75 V preserves loop accuracy; 120 °C/W RθJA allows direct PCB mounting without heatsinks. |
| Telecom Line Surge Suppression | Consumer Power Adapter Input Stage |
Use Scenario: Safeguarding PoE-powered Ethernet PHYs against lightning-induced surges on twisted-pair cables. IC Role / Device Role / Timing Role: Primary-level bidirectional clamp on common-mode lines, coordinated with gas discharge tubes for staged protection. Use Value: 400 W PPPM handles multi-kV surges; AEC-Q101 grade ensures long-term reliability in unattended infrastructure gear. | Use Scenario: Input-stage transient suppression in wall-mounted USB-C PD adapters exposed to mains-borne surges. IC Role / Device Role / Timing Role: Secondary-line TVS after MOV, providing precise clamping where MOV let-through exceeds IC tolerance. Use Value: 75 V VWM matches 72 V rectified peak of universal input; halogen-free HM3 suffix satisfies regional environmental mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75CAHE3_A/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Preferred for commercial-grade automotive modules where halogen content is unrestricted | Select when cost sensitivity outweighs halogen-free requirement; identical footprint and thermal behavior |
| SMBJ75CAHM3_A/I | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package with lower RθJA (90 °C/W) | Better suited for higher average power dissipation or less aggressive PCB copper area allocation | Choose when thermal margin is constrained and board space permits larger 4.57 mm × 3.94 mm footprint |
Compared with SMAJ75CAHM3_A/I, the HE3 variant trades halogen-free compliance for slightly lower unit cost while maintaining AEC-Q101 reliability, whereas the SMBJ75CAHM3_A/I offers improved thermal performance at the expense of increased board area - making SMAJ75CAHM3_A/I optimal for space-constrained, environmentally regulated automotive and industrial designs.
Availability
SMAJ75CAHM3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom infrastructure, and consumer power adapters requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ75CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for robust transient voltage suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to ESD, lightning, or load dump must be prevented without compromising size or manufacturability.
FAQ
What does the "HM3_A/I" suffix indicate for SMAJ75CAHM3_A/I?
The "HM3" denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction; "_A/I" specifies the revision level and 13-inch tape-and-reel packaging (7500 units per reel). This confirms SMAJ75CAHM3_A/I meets automotive reliability standards and environmental regulations without brominated flame retardants.
Is SMAJ75CAHM3_A/I suitable for protecting 24 V industrial control systems?
Yes - SMAJ75CAHM3_A/I's 75 V standoff voltage provides adequate margin above 24 V nominal rails (including 30 V transients), and its 121 V clamping voltage ensures downstream 36 V-rated components remain within safe operating limits during IEC 61000-4-4/5 surges.
How does the bidirectional nature of SMAJ75CAHM3_A/I affect PCB layout?
Because SMAJ75CAHM3_A/I has no polarity marking and symmetric conduction, PCB layout requires no orientation check - simplifying automated placement and reducing assembly errors. However, symmetric 0.2" × 0.2" copper pads must be used on both terminals to maintain thermal balance and achieve rated 400 W pulse power.
Can SMAJ75CAHM3_A/I replace SMAJ75A in existing designs?
No - SMAJ75A is unidirectional and requires correct cathode orientation; SMAJ75CAHM3_A/I is bidirectional with different marking and electrical symmetry. Substitution would require layout review to confirm absence of polarity-dependent circuitry and verify that bidirectional clamping aligns with system fault tolerance requirements.
What is the maximum allowable ambient temperature for continuous operation of SMAJ75CAHM3_A/I?
At 50 °C ambient, SMAJ75CAHM3_A/I is rated for 3.3 W power dissipation on an infinite heatsink. With its 120 °C/W RθJA, junction temperature reaches 150 °C at 50 °C ambient plus 3.3 W × 120 °C/W = 89.6 °C rise - well within the +150 °C TJ max limit. Derating curves in Fig. 2 apply for higher ambient temperatures.
SMAJ75CAHM3_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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- 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)
SMAJ75CAHM3_A/I FAQ
1.How can I place an order for SMAJ75CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75CAHM3_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 SMAJ75CAHM3_A/I reliable?
The price and inventory of SMAJ75CAHM3_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 SMAJ75CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ75CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75CAHM3_A/I?
SMAJ75CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75CAHM3_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 SMAJ75CAHM3_A/I?
For technical support, including SMAJ75CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ75CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ75CAHM3_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 SMAJ75CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ75CAHM3_A/I?
All SMAJ75CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75CAHM3_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 SMAJ75CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ75CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ75CAHM3_A/I Tags
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