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Vishay General Semiconductor - Diodes Division SMAJ7.5CA-M3/5A
- Part No.:
- SMAJ7.5CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5CA-M3/5A.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,250
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Product details
Overview
SMAJ7.5CA-M3/5A 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 - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the SMAJ7.5CA-M3/5A datasheet, SMAJ7.5CA-M3/5A pinout, SMAJ7.5CA-M3/5A application, or SMAJ7.5CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.72), MSL Level 1 moisture sensitivity, halogen-free RoHS compliance (M3 suffix), and AEC-Q101 qualification readiness via HM3 variant.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at VWM), then rapidly avalanches below 1 ns to divert surge current away from downstream circuitry. Its bidirectional symmetry ensures identical clamping behavior for positive and negative transients, eliminating polarity concerns in AC-coupled or differential signal paths.
The device uses a glass-passivated silicon junction for stable breakdown characteristics and low incremental surge resistance. Thermal design relies on RθJA = 120 °C/W (on 5.0 mm × 5.0 mm copper pads), enabling reliable operation up to TJ = 150 °C with derated pulse power above 25 °C ambient per Fig. 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before significant leakage; defines safe signal swing margin for protected line. |
| VBR min/max | 8.33 V / 9.21 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across production lot and temperature. |
| VC @ IPPM | 12.9 V at 31.0 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream IC or MOSFET. |
| PPPM | 400 W - Peak transient energy handling capacity; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges on 24 V systems. |
| ID @ VWM | 100 μA - Reverse leakage at rated stand-off; low enough to avoid loading sensitive analog or logic inputs. |
| Package | SMA (DO-214AC) - Standardized SMT outline with 2.54 mm lead pitch; compatible with automated placement and reflow profiles up to 260 °C peak. |
| Temperature Range | −55 °C to +150 °C - Full operational junction range supports under-hood automotive and industrial environments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both terminals) | Surge Current Path | Identical bidirectional conduction path; either terminal may serve as input or return - no orientation required during placement. |
| Case (body) | Thermal & Mechanical Interface | Plastic body provides electrical isolation; thermal path relies on soldered pad area (0.2" × 0.2") for RθJA = 120 °C/W performance. |
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. |
| 400 W peak pulse power | Handles repetitive 10/1000 μs transients at 0.01% duty cycle - suitable for switch-mode power supply noise and relay coil kickback. |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance requirements for global industrial and automotive shipments without compromising surge robustness. |
| MSL Level 1, 260 °C peak | Eliminates bake-out requirement prior to reflow; supports standard lead-free assembly processes without moisture-induced failure risk. |
| AEC-Q101 qualification path | HM3 variant available - enables drop-in use in automotive ECUs, ADAS sensors, and body control modules requiring qualified components. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD events in vehicle subsystems. IC Role / Device Role / Timing Role: Shunt clamping element placed directly at connector interface to limit transient voltage before reaching PHY or ADC front-end. Use Value: Maintains signal integrity by clamping surges to ≤12.9 V while surviving repeated 400 W pulses - critical for ISO 16750-2 compliance. |
Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against inductive switching spikes from solenoids and contactors. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp on field-side input traces, placed upstream of optocoupler or Schmitt trigger input stage. Use Value: Prevents latch-up or permanent damage to input conditioning circuitry with sub-1 ns response and low clamping ratio (VC/VWM = 1.72). |
| Consumer Power Adapter Output | Telecom Line Interface |
|
Use Scenario: Secondary-side transient suppression on 5–12 V DC outputs of wall adapters and USB PD chargers exposed to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional voltage limiter between VOUT and GND, absorbing both positive and negative polarity surges induced by cable coupling. Use Value: Eliminates need for separate unidirectional devices; reduces BOM count while meeting IEC 61000-4-2 Level 4 (15 kV air) and IEC 61000-4-5 requirements. |
Use Scenario: Protecting Ethernet PHY or DSL line drivers from lightning-induced surges and AC power cross-talk on telecom infrastructure equipment. IC Role / Device Role / Timing Role: Primary-level surge diverter on twisted-pair line interface, mounted adjacent to RJ-45 jack with minimal trace length. Use Value: Withstands 31.0 A peak current at 12.9 V clamping, ensuring downstream PHY ICs remain within absolute maximum ratings during multi-kV transients. |
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-E3/5A | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Acceptable for commercial/industrial use where halogen-free mandate does not apply. | Select E3 when cost sensitivity outweighs halogen-free requirement; M3 preferred for automotive Tier 1 and green procurement policies. |
| SMBJ7.5CA-M3 | Higher 600 W PPPM rating, larger SMB (DO-214AA) package, same VWM/VBR/VC specs. | Better suited for higher-energy surges (e.g., 48 V industrial buses); requires larger PCB footprint. | Choose SMBJ7.5CA-M3 when system-level surge testing exceeds 400 W or when thermal margin is constrained by ambient conditions. |
Compared with SMAJ7.5CA-E3/5A, the SMAJ7.5CA-M3/5A offers halogen-free compliance without sacrificing clamping performance; versus SMBJ7.5CA-M3, it trades 200 W pulse power headroom for 30% smaller board area and identical mounting compatibility with legacy SMA footprints.
Availability
SMAJ7.5CA-M3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer power adapter outputs, and telecom line interfaces requiring stable component supply across long-lifecycle programs.
Supply support for SMAJ7.5CA-M3/5A 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 AEC-Q qualification.
The SMAJ series was engineered for high-reliability transient suppression in space-constrained SMT designs - targeting automotive, industrial, and telecom applications where fast response, repeatable clamping, and process compatibility are mandatory.
FAQ
What is the clamping voltage of SMAJ7.5CA-M3/5A at its rated peak pulse current?
The SMAJ7.5CA-M3/5A exhibits 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 JEDEC test conditions and represents the upper bound of voltage seen by protected circuitry during worst-case surge events - critical for verifying downstream IC absolute maximum ratings.
Is SMAJ7.5CA-M3/5A suitable for automotive applications?
Yes - the SMAJ7.5CA-M3/5A is halogen-free and RoHS-compliant, and its HM3 variant (e.g., SMAJ7.5CAHM3_A/I) is AEC-Q101 qualified. While the base M3 version is not pre-qualified, it shares identical die and packaging with the HM3 grade, making it suitable for automotive prototyping and non-safety-critical modules pending full qualification validation.
How does the bidirectional nature of SMAJ7.5CA-M3/5A affect PCB layout?
The SMAJ7.5CA-M3/5A has no polarity marking and identical electrical behavior in both directions, so PCB layout requires no orientation constraint. It can be placed symmetrically across any two-node interface - such as differential signal pairs or ungrounded power rails - reducing placement errors and eliminating the need for silkscreen polarity indicators.
What is the thermal resistance of SMAJ7.5CA-M3/5A, and how does it impact surge handling?
The SMAJ7.5CA-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads. This value directly limits repetitive surge capability: at elevated ambient temperatures, peak pulse power must be derated per Fig. 2 in the datasheet to prevent junction overheating beyond 150 °C - especially relevant in enclosed industrial enclosures.
Can SMAJ7.5CA-M3/5A replace SMAJ7.5A-M3/5A in a design?
No - SMAJ7.5CA-M3/5A is bidirectional, while SMAJ7.5A-M3/5A is unidirectional with cathode marking. Substituting them without circuit review risks improper clamping of negative transients or forward conduction during normal operation. The CA suffix explicitly denotes symmetrical breakdown; replacement requires verification of signal polarity and grounding architecture.
SMAJ7.5CA-M3/5A 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-M3/5A FAQ
1.How can I place an order for SMAJ7.5CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5CA-M3/5A 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-M3/5A reliable?
The price and inventory of SMAJ7.5CA-M3/5A 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-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ7.5CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5CA-M3/5A?
SMAJ7.5CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5CA-M3/5A 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-M3/5A?
For technical support, including SMAJ7.5CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ7.5CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5CA-M3/5A 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-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ7.5CA-M3/5A?
All SMAJ7.5CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5CA-M3/5A, 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-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ7.5CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5CA-M3/5A Tags
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