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Vishay General Semiconductor - Diodes Division SMA5J40CA-M3/5A
- Part No.:
- SMA5J40CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40CA-M3/5A.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,455
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Product details
Overview
SMA5J40CA-M3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on power and signal lines. It features 40 V stand-off voltage (VWM), 49.1 V maximum breakdown voltage (VBR), 500 W peak pulse power (PPPM), clamping voltage of 64.5 V at 7.8 A IPPM, and operates from −55 °C to +150 °C - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMA5J40CA-M3/5A datasheet, SMA5J40CA-M3/5A pinout, SMA5J40CA-M3/5A application, or SMA5J40CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, 500 W 10/1000 μs surge rating, halogen-free RoHS compliance (M3 suffix), AEC-Q101 qualification eligibility, and DO-214AC thermal performance with RθJA = 80 °C/W.
Technical Context
This device functions as a voltage-clamped crowbar during transients: when reverse voltage exceeds VBR (44.4–49.1 V), it avalanches to limit downstream voltage to ≤64.5 V at 7.8 A. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response (<1 ns), critical for protecting MOSFET gates and microcontroller I/O pins.
Rated for 500 W peak pulse power under 10/1000 μs waveform, it sustains repetitive surges when mounted on 5.0 mm × 5.0 mm copper pads per terminal. The bidirectional symmetry eliminates polarity concerns in AC-coupled or floating lines, and M3 suffix confirms halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 36–40 V DC rails. |
| VBR min/max | 44.4 V / 49.1 V - guaranteed avalanche initiation range at 1 mA test current; ensures consistent clamping onset across production lots. |
| VC @ IPPM | 64.5 V at 7.8 A - clamped voltage during 10/1000 μs surge; determines maximum stress imposed on protected ICs. |
| PPPM | 500 W - peak transient energy handling capacity; enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | <1.0 μA - ultra-low reverse leakage at rated stand-off; prevents quiescent power loss and false triggering in high-impedance circuits. |
| TJ max | +150 °C - maximum junction temperature; supports under-hood automotive use and industrial environments with minimal derating. |
| RθJA | 80 °C/W - thermal resistance junction-to-ambient on standard pad layout; informs heatsinking requirements for sustained surge duty cycles. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional - no polarity marking; symmetrical terminals enable orientation-agnostic placement on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically in bidirectional mode; no cathode band marking required - simplifies layout and eliminates polarity errors. |
| Case (body) | Thermal and mechanical interface | Plastic body with UL 94 V-0 rating; transfers heat to PCB copper pads - requires 5.0 mm × 5.0 mm minimum pad area per terminal per datasheet fig. 2. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses (e.g., RS-485), and floating sensors without external diode pairing. |
| 500 W 10/1000 μs rating | Withstands automotive load-dump and inductive-switching transients per ISO 7637-2 without degradation when properly mounted. |
| Glass-passivated junction | Ensures stable VBR and low ID over temperature and lifetime - critical for long-term reliability in unattended industrial systems. |
| Halogen-free, RoHS-compliant (M3) | Meets IPC-1752A material declaration requirements and JESD201 Class 2 whisker resistance - suitable for green manufacturing. |
| AEC-Q101 qualification path | Base P/NHM3_X variant available with full automotive qualification - allows seamless migration from commercial to automotive-grade designs. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from battery dump and ESD in engine control units. IC Role / Device Role / Timing Role: Bidirectional TVS clamp limiting transient voltage to ≤64.5 V while maintaining signal integrity during normal operation. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V microcontrollers and transceivers exposed to ISO 7637-2 Pulse 5a (100 V/2 Ω). |
Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against field-wiring surges and relay contact bounce. IC Role / Device Role / Timing Role: High-power crowbar element shunting >500 W surge energy away from optocoupler inputs and protection FETs. Use Value: Enables >100,000 surge cycles without parameter shift - verified per IEC 61000-4-5 with 2 Ω source impedance. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Shielding Ethernet PHY magnetics and PoE injectors from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage bidirectional clamp on secondary-side DC lines, coordinating with GDT or MOV upstream. Use Value: Clamps 10/1000 μs surges to 64.5 V within <1 ns - faster than typical polymer-based protectors and compatible with IEEE 802.3bt PoE++ timing. |
Use Scenario: Suppressing switching noise and line transients on 5 V/12 V USB-C PD adapter outputs feeding sensitive peripherals. IC Role / Device Role / Timing Role: Final-stage TVS on output rail, placed after LC filter to prevent overshoot during load step changes. Use Value: Limits output voltage excursion to ≤64.5 V during 500 W surge - protects connected devices compliant with USB-IF ESD immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ40CA | Same 40 V VWM, 64.5 V VC, but lower PPPM (400 W); RθJA = 85 °C/W; non-halogen-free standard version. | Limited to lower-energy surges (IEC 61000-4-5 Level 2); not qualified for automotive under hood. | Select when cost sensitivity outweighs 100 W headroom and AEC-Q101 is unnecessary. |
| ON Semiconductor 1.5SMC40CA | Identical electrical specs (40 V VWM, 64.5 V VC, 500 W), but in larger SMC (DO-214AB) package; RθJA = 65 °C/W. | Higher thermal performance enables higher average surge duty; requires larger PCB footprint (7.11 mm × 6.22 mm vs. 4.93 mm × 3.99 mm). | Choose when thermal management dominates board space constraints, especially in high-temperature enclosures. |
Compared with SMA5J40CA-M3/5A, SMAJ40CA offers lower cost but reduced surge margin and no halogen-free assurance, while 1.5SMC40CA trades compactness for superior thermal dissipation - making SMA5J40CA-M3/5A optimal for space-constrained, automotive-adjacent, and green-design applications.
Availability
SMA5J40CA-M3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer power adapter outputs requiring stable component supply, halogen-free compliance, and AEC-Q101 upgrade path.
Supply support for SMA5J40CA-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, and protection devices with emphasis on reliability, power density, and automotive-grade qualification.
The SMA5J series was engineered for high-power-density transient suppression in space-constrained, thermally demanding environments - targeting automotive, industrial, and telecom applications where 500 W surge handling and DO-214AC footprint are critical.
FAQ
What is the polarity configuration of SMA5J40CA-M3/5A?
SMA5J40CA-M3/5A is a bidirectional TVS diode with symmetrical terminals and no cathode marking. Unlike unidirectional variants, it conducts equally in both directions above VBR - ideal for AC-coupled lines, differential buses, and floating ground systems where polarity cannot be guaranteed during installation or operation.
Does SMA5J40CA-M3/5A meet AEC-Q101 qualification?
SMA5J40CA-M3/5A itself is the commercial-grade halogen-free variant (M3 suffix). However, Vishay offers the HM3_X derivative (e.g., SMA5J40CAHM3_A/I) which is fully AEC-Q101 qualified. Engineers designing for automotive under-hood use should specify the HM3_X suffix to ensure qualification compliance and extended temperature validation.
What is the maximum clamping voltage for SMA5J40CA-M3/5A under surge conditions?
The maximum clamping voltage (VC) for SMA5J40CA-M3/5A is 64.5 V, measured at 7.8 A peak pulse current (IPPM) using the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events, ensuring compatibility with 48 V system components and 3.3 V/5 V logic interfaces via appropriate series impedance.
How does the M3 suffix affect the environmental compliance of SMA5J40CA-M3/5A?
The M3 suffix on SMA5J40CA-M3/5A indicates halogen-free, RoHS-compliant construction per IPC-1752A and JESD201 Class 2 whisker resistance. It replaces brominated flame retardants with phosphorus-based alternatives while maintaining UL 94 V-0 flammability rating - satisfying strict environmental mandates for consumer, medical, and export-oriented electronics.
What PCB pad layout is required to achieve the rated 500 W pulse power for SMA5J40CA-M3/5A?
To sustain the full 500 W peak pulse power rating, SMA5J40CA-M3/5A must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads connected to internal or external thermal planes. Deviation from this layout increases RθJA beyond the specified 80 °C/W, reducing surge current handling and risking thermal runaway during repetitive transients.
SMA5J40CA-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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J40CA-M3/5A FAQ
1.How can I place an order for SMA5J40CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40CA-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 SMA5J40CA-M3/5A reliable?
The price and inventory of SMA5J40CA-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 SMA5J40CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J40CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40CA-M3/5A?
SMA5J40CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40CA-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 SMA5J40CA-M3/5A?
For technical support, including SMA5J40CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40CA-M3/5A requirements.
6.How does Aetrix verify that SMA5J40CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J40CA-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 SMA5J40CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J40CA-M3/5A?
All SMA5J40CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40CA-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 SMA5J40CA-M3/5A part is unused and in its original packaging.
Return procedure for SMA5J40CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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