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Vishay General Semiconductor - Diodes Division SMAJ28CA-M3/5A
- Part No.:
- SMAJ28CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28CA-M3/5A.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,448
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Product details
Overview
SMAJ28CA-M3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection on signal and power lines. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage (VC) at 8.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ28CA-M3/5A datasheet, SMAJ28CA-M3/5A pinout, SMAJ28CA-M3/5A application, or SMAJ28CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification eligibility (via HM3 suffix), low incremental surge resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA construction, enabling protection against positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and fast response time (<1 ps), while the SMA package supports surface-mount reflow with MSL level 1 rating (peak 260 °C).
The device delivers 45.4 V clamping at 8.8 A (10/1000 μs), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), allowing reliable operation up to +150 °C junction temperature under defined PCB layout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - Ensures precise turn-on threshold with tight 5 % tolerance |
| VC @ IPPM | 45.4 V at 8.8 A - Limits downstream voltage stress during 10/1000 μs surge events |
| PPPM | 400 W - Peak pulse power handling per JEDEC standard waveform, derated above 78 V |
| IFSM | 40 A - Surge current rating for 8.3 ms half-sine wave (unidirectional only; not applicable here) |
| TJ max. | +150 °C - Enables use in under-hood automotive and high-temperature industrial environments |
| Package | SMA (DO-214AC) - Standardized 2-pin SMT footprint with 5.28 mm × 4.50 mm body and 2.54 mm lead pitch |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional - no polarity marking; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Acts as cathode during positive surges and anode during negative surges - no fixed polarity |
| Cathode | Transient return path (bidirectional) | Identical electrical role to Anode; terminals are interchangeable in circuit layout |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating lines without external polarity management |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) on properly laid out PCBs |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance requirements for automotive and industrial end equipment |
| MSL level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking preconditioning |
| AEC-Q101 qualification option | Available with HM3 suffix for automotive-grade reliability validation (not inherent to -M3/5A) |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD 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 excursions to ≤45.4 V, preserving integrity of 3.3 V/5 V logic and analog front-ends without adding series impedance. | Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to inductive switching noise from solenoids and relays. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input rails and isolated signal channels to absorb repetitive 400 W surges. Use Value: Maintains system uptime by preventing latch-up or damage to optocouplers and microcontrollers during factory automation transients. |
| Consumer USB Port Protection | Telecom Line Card Surge Suppression |
Use Scenario: Secondary-level protection on USB 2.0 data lines (D+/D−) and VBUS against ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS placed adjacent to connector to shunt sub-nanosecond ESD pulses before reaching USB PHY. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) within 1 ps, with <1 pF junction capacitance minimizing signal distortion. | Use Scenario: Primary surge protection on POTS line interfaces in DSLAMs and VoIP gateways subjected to lightning-induced longitudinal surges. IC Role / Device Role / Timing Role: Bidirectional TVS installed between tip/ring and ground to clamp common-mode transients up to 6 kV. Use Value: Withstands repeated 10/1000 μs surges per ITU-T K.20/K.44, extending service life of line drivers and codec ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28CA-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3) | Preferred for commercial-grade non-automotive designs where halogen content is unrestricted | Select when halogen-free requirement is absent and cost optimization is prioritized |
| SMAJ28A-M3/5A | Unidirectional variant; cathode band marked; same VWM/VC/PPPM, but asymmetric conduction | Required only where circuit topology mandates polarity-aware clamping (e.g., DC-biased rails) | Choose only if design uses unidirectional biasing - otherwise SMAJ28CA-M3/5A provides broader flexibility |
Compared with SMAJ28CA-E3/5A and SMAJ28A-M3/5A, the SMAJ28CA-M3/5A uniquely combines bidirectional operation, halogen-free construction, and industry-standard SMA packaging - making it optimal for space-constrained, environmentally regulated, and polarity-agnostic protection schemes.
Availability
SMAJ28CA-M3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and telecom line card surge suppression requiring stable component supply and traceable sourcing.
Supply support for SMAJ28CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against inductive switching, ESD, and lightning surges is critical.
FAQ
What does the "CA" suffix indicate in SMAJ28CA-M3/5A?
The "CA" suffix denotes bidirectional configuration: SMAJ28CA-M3/5A clamps voltage transients equally in both polarities, unlike unidirectional "A" variants. This eliminates need for polarity orientation during placement and supports AC-coupled or floating signal lines. The device has no cathode marking, confirming its symmetrical terminal behavior.
Is SMAJ28CA-M3/5A qualified to AEC-Q101?
No - SMAJ28CA-M3/5A is not AEC-Q101 qualified. The "M3" suffix indicates halogen-free and RoHS-compliant construction, but automotive qualification requires the "HM3" suffix (e.g., SMAJ28CAHM3_A/I). For automotive applications demanding AEC-Q101, specify the HM3 variant with appropriate revision code.
What is the maximum clamping voltage of SMAJ28CA-M3/5A and under what test condition?
The maximum clamping voltage (VC) of SMAJ28CA-M3/5A is 45.4 V, measured at 8.8 A peak pulse current using the standardized 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuits during surge events and is guaranteed per Vishay's datasheet revision 09-Jan-2024 (Doc. #88390).
Can SMAJ28CA-M3/5A be used in place of SMAJ28A-M3/5A?
SMAJ28CA-M3/5A can replace SMAJ28A-M3/5A only if the circuit is polarity-insensitive - e.g., AC signals or floating buses. SMAJ28A-M3/5A is unidirectional with cathode marking and conducts only in reverse bias; substituting the bidirectional CA version avoids incorrect orientation risk but may alter leakage behavior in DC-biased rails.
What PCB layout guidance applies to SMAJ28CA-M3/5A for optimal surge performance?
For rated 400 W pulse power, Vishay specifies mounting SMAJ28CA-M3/5A on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Minimizing trace inductance with short, wide traces and solid ground planes is essential to achieve specified clamping voltage. Thermal relief should be avoided to maintain low RθJA (120 °C/W).
SMAJ28CA-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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- 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)
SMAJ28CA-M3/5A FAQ
1.How can I place an order for SMAJ28CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28CA-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 SMAJ28CA-M3/5A reliable?
The price and inventory of SMAJ28CA-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 SMAJ28CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ28CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28CA-M3/5A?
SMAJ28CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28CA-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 SMAJ28CA-M3/5A?
For technical support, including SMAJ28CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ28CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ28CA-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 SMAJ28CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ28CA-M3/5A?
All SMAJ28CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28CA-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 SMAJ28CA-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ28CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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