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Vishay General Semiconductor - Diodes Division SMAJ7.5CA-M3/61
- Part No.:
- SMAJ7.5CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5CA-M3/61.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,598
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Product details
Overview
SMAJ7.5CA-M3/61 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, and clamps to ≤12.9 V at 31.0 A peak pulse current (IPPM) under 10/1000 μs waveform - protecting sensitive ICs and MOSFETs in automotive and industrial control interfaces.
For engineers reviewing the SMAJ7.5CA-M3/61 datasheet, SMAJ7.5CA-M3/61 pinout, SMAJ7.5CA-M3/61 application, or SMAJ7.5CA-M3/61 equivalent, key selection criteria include bidirectional clamping capability, 400 W peak pulse power rating (10/1000 μs), low clamping ratio (VC/VBR ≈ 1.55), AEC-Q101 qualification eligibility (via HM3 suffix), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamping protector: during transient overvoltage events exceeding VWM (7.5 V), it avalanches rapidly (<1 ns response time) to divert surge current away from downstream circuitry. Its bidirectional symmetry ensures identical clamping behavior for positive and negative polarity transients - critical for AC-coupled or floating signal lines.
The SMAJ7.5CA-M3/61 uses a glass-passivated silicon junction housed in an SMA package rated for 150 °C maximum junction temperature, with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W. It delivers 400 W peak pulse power (derated to 300 W above 78 V) and withstands 40 A non-repetitive forward surge current (IFSM) per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 7.5 V - maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 8.33–9.21 V at 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on across temperature and unit variation |
| VC (Clamping Voltage) | ≤12.9 V at IPPM = 31.0 A - maximum voltage seen by protected circuit during worst-case 10/1000 μs surge |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - energy-handling capacity for transient suppression; derates linearly above TA = 25 °C |
| ID (Reverse Leakage) | ≤100 μA at VWM - minimal DC loading on signal/power line during normal operation |
| TJ max. | 150 °C - enables use in under-hood automotive and high-ambient industrial environments |
| Package | SMA (DO-214AC) - industry-standard SMT footprint compatible with IPC-7351B, supports automated placement and reflow |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration - no polarity marking required; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals function identically; surge current flows through either direction without polarity constraint |
| Case (body) | Thermal and mechanical interface | Exposed copper pad contact area transfers heat to PCB; requires minimum 5.0 mm × 5.0 mm copper per terminal per datasheet fig. 2 |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating lines without external polarity management |
| 400 W peak pulse power (10/1000 μs) | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) when properly laid out |
| Low clamping ratio (VC/VBR ≈ 1.55) | Minimizes overvoltage stress on protected ICs compared to competing TVS devices |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| Halogen-free & RoHS-compliant (M3 suffix) | Fulfills environmental compliance requirements for global industrial and automotive supply chains |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 12 V CAN/LIN bus signal lines from load dump and inductive switching transients in vehicle door modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, responding within <1 ns to suppress spikes up to ±100 V. Use Value: Prevents latch-up or gate oxide damage in transceiver ICs while maintaining signal integrity due to low capacitance (<100 pF at 0 V). |
Use Scenario: Safeguarding 24 V digital input channels against field-wiring induced surges in factory automation controllers. IC Role / Device Role / Timing Role: Primary overvoltage shunt on each optocoupler input node, clamping transients before they reach isolation barrier. Use Value: Enables robust operation in harsh EMI environments with 400 W surge handling and 150 °C junction rating for extended service life. |
| Consumer Appliance Motor Drive Interface | Telecom Base Station Power Monitoring Line |
Use Scenario: Shielding microcontroller GPIOs connected to brushed DC motor feedback sensors from commutation noise. IC Role / Device Role / Timing Role: Localized transient suppressor mounted directly at sensor connector, limiting voltage excursions to ≤12.9 V. Use Value: Eliminates need for additional RC filtering or ferrite beads while supporting high-speed edge detection on tachometer signals. |
Use Scenario: Protecting analog voltage monitoring inputs on -48 V telecom power supplies from lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: First-stage clamping device on sensing path, absorbing >30 A pulses without degradation over 10⁵ events. Use Value: Ensures measurement accuracy and system uptime by preventing false fault triggers or ADC saturation during transient events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5CA-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free; commercial grade only (no AEC-Q101 path) | Preferred for cost-sensitive consumer electronics where halogen-free requirement is absent | Select when environmental compliance mandates RoHS only, not halogen-free; identical layout and performance |
| SMBJ7.5CA-M3 | Higher 600 W PPPM rating; larger SMB (DO-214AA) package; same VWM/VBR/VC specs | Suitable where higher surge margin is needed and board space allows larger footprint | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 or repeated transients demand extra margin |
Compared with SMAJ7.5CA-M3/61, the E3 variant offers identical protection performance at lower cost but lacks halogen-free certification, while the SMBJ7.5CA-M3 provides 50 % higher pulse power in a larger package - enabling longer lifetime in high-duty-cycle industrial deployments without changing circuit topology.
Availability
SMAJ7.5CA-M3/61 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and telecom power monitoring systems requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification readiness.
Supply support for SMAJ7.5CA-M3/61 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, power efficiency, and automotive-grade qualification.
The SMAJ series was developed specifically for high-reliability transient suppression in space-constrained SMT applications across automotive, industrial, and telecom markets - balancing surge robustness, thermal performance, and manufacturability.
FAQ
What is the clamping voltage of SMAJ7.5CA-M3/61 at its rated peak pulse current?
The SMAJ7.5CA-M3/61 has a maximum clamping voltage (VC) of 12.9 V when subjected to its rated peak pulse current (IPPM) of 31.0 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry will not experience more than 12.9 V during such transient events - critical for safeguarding 3.3 V or 5 V logic interfaces downstream of the SMAJ7.5CA-M3/61.
Is SMAJ7.5CA-M3/61 suitable for automotive applications requiring AEC-Q101 qualification?
The SMAJ7.5CA-M3/61 itself is not AEC-Q101 qualified, but Vishay offers the functionally identical SMAJ7.5CA-HM3_X variant (e.g., SMAJ7.5CAHM3_A/H) which carries full AEC-Q101 qualification. The M3 suffix indicates halogen-free and RoHS compliance, and the HM3 prefix denotes the automotive-qualified version - both share identical electrical characteristics, package, and pinout with SMAJ7.5CA-M3/61.
How does the bidirectional design of SMAJ7.5CA-M3/61 affect its PCB layout compared to unidirectional TVS diodes?
The bidirectional design of SMAJ7.5CA-M3/61 eliminates polarity marking and orientation constraints during placement - unlike unidirectional variants (e.g., SMAJ7.5A-M3/61) that require cathode band alignment. This simplifies automated assembly, reduces risk of misplacement, and enables symmetric routing on differential or AC-coupled lines without concern for terminal assignment - a direct benefit realized in every SMAJ7.5CA-M3/61 layout.
What is the maximum reverse leakage current specified for SMAJ7.5CA-M3/61 at its stand-off voltage?
The SMAJ7.5CA-M3/61 specifies a maximum reverse leakage current (ID) of 100 μA at its stand-off voltage (VWM) of 7.5 V and ambient temperature of 25 °C. This low leakage ensures minimal power loss and signal distortion in always-on monitoring circuits, making SMAJ7.5CA-M3/61 appropriate for battery-powered or high-impedance sensor interfaces where standby current budget is critical.
Can SMAJ7.5CA-M3/61 be used in parallel to increase surge current handling?
No - SMAJ7.5CA-M3/61 must not be paralleled to increase surge current capacity. Due to manufacturing tolerances in VBR (8.33–9.21 V), mismatched avalanche turn-on causes current hogging in one device, leading to premature failure. For higher IPPM requirements, select a single higher-rated device like SMBJ7.5CA-M3 (600 W) or SMCJ7.5CA-M3 (1500 W), both of which maintain compatibility with SMAJ7.5CA-M3/61's protection function.
SMAJ7.5CA-M3/61 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ7.5CA-M3/61 FAQ
1.How can I place an order for SMAJ7.5CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5CA-M3/61 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 SMAJ7.5CA-M3/61 reliable?
The price and inventory of SMAJ7.5CA-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ7.5CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5CA-M3/61?
SMAJ7.5CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5CA-M3/61 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 SMAJ7.5CA-M3/61?
For technical support, including SMAJ7.5CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ7.5CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5CA-M3/61 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 SMAJ7.5CA-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ7.5CA-M3/61?
All SMAJ7.5CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5CA-M3/61, 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 SMAJ7.5CA-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ7.5CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5CA-M3/61 Tags
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