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Vishay General Semiconductor - Diodes Division SMAJ28CA-M3/61
- Part No.:
- SMAJ28CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28CA-M3/61.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,622
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Product details
Overview
SMAJ28CA-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 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA test current, and clamps to ≤45.4 V at 8.8 A peak pulse current under 10/1000 μs waveform - protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMAJ28CA-M3/61 datasheet, SMAJ28CA-M3/61 pinout, SMAJ28CA-M3/61 application, or SMAJ28CA-M3/61 equivalent, key selection criteria include bidirectional clamping capability, 400 W peak pulse power rating (≤78 V), low leakage (<1 μA at 28 V), AEC-Q101 qualification eligibility (via HM3 suffix), and compatibility with automated SMT placement on standard PCB pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA construction, enabling protection of AC-coupled or differential signal lines without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance during transient events.
The device delivers 400 W peak pulse power handling per 10/1000 μs waveform up to 78 V, derating to 300 W above that threshold. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting reliable operation within -55 °C to +150 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 31.1 V / 34.4 V at 1 mA - guaranteed breakdown window defining turn-on consistency |
| VC @ IPPM | ≤45.4 V at 8.8 A - clamped voltage during worst-case 10/1000 μs surge, limiting stress on downstream components |
| PPPM | 400 W - peak pulse power dissipation capability for transient suppression without failure |
| ID @ VWM | <1 μA - ultra-low reverse leakage ensuring minimal standby power loss and signal integrity |
| TJ max | +150 °C - maximum junction temperature enabling use in under-hood automotive and high-temperature industrial environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal requirement |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-002 solderability requirements. Polarity: unmarked for bidirectional types; no cathode/anode designation required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (direction-agnostic) | One terminal of symmetrical PN junction; accepts surge current from either polarity |
| Cathode | Transient current exit point (direction-agnostic) | Second terminal of symmetrical PN junction; completes low-impedance path during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC, differential, or floating signal lines without polarity constraints |
| 400 W peak pulse power (≤78 V) | Handles high-energy transients such as ISO 7637-2 Pulse 1/2a/5a in automotive ECUs without degradation |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance requirements for global industrial and automotive supply chains |
| MSL Level 1 (260 °C reflow) | Supports standard lead-free SMT assembly processes without moisture sensitivity concerns |
| AEC-Q101 qualification option | HM3 variant available for automotive applications requiring validated reliability per stress-test standards |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller GPIOs from load dump and inductive switching spikes in vehicle door modules. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector interface to shunt transients before reaching sensitive silicon. Use Value: Limits voltage excursion to ≤45.4 V during 100 V/50 ms load dump events, preserving 3.3 V/5 V logic integrity and avoiding latch-up. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers against field-wiring surges and ESD. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact or optocoupler input stage, positioned upstream of series current-limiting resistor. Use Value: Withstands repeated 400 W transients while maintaining <1 μA leakage, preventing false triggering and ensuring long-term channel accuracy. |
| Consumer Appliance Motor Drive | Telecom Power Interface |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home appliances (e.g., washing machine control boards). IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals or H-bridge outputs to clamp inductive kickback. Use Value: Fast response time and low clamping voltage prevent MOSFET avalanche failure during commutation, extending drive-stage lifetime. |
Use Scenario: Protecting PoE-powered Ethernet PHY interfaces from lightning-induced surges on data lines and auxiliary power rails. IC Role / Device Role / Timing Role: Secondary-level transient suppressor after primary gas discharge tube, fine-clamping residual energy. Use Value: Symmetrical breakdown enables identical protection on both differential pairs (e.g., MDI/MDIX), maintaining signal balance and EMC performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28CA-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free; uses standard tin plating instead of halogen-free molding compound | Preferred for commercial-grade cost-sensitive designs where halogen-free certification is not mandated | Select when environmental compliance requires RoHS only, not IEC 61249-2-21 or JEDEC JS709C halogen-free classification |
| SMBJ28CA-M3 | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; higher thermal mass (RθJA = 85 °C/W vs. 120 °C/W) | Better suited for higher average power dissipation or less optimized PCB layouts with limited copper area | Choose when board space allows larger footprint and thermal design cannot guarantee 5.0 mm × 5.0 mm SMA copper pads |
Compared with SMAJ28CA-M3/61, the E3 variant offers identical protection performance at lower material cost but lacks halogen-free certification, while SMBJ28CA-M3 provides superior thermal robustness in thermally constrained systems at the expense of PCB area and assembly density.
Availability
SMAJ28CA-M3/61 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and consumer appliance motor control systems requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification readiness.
Supply support for SMAJ28CA-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, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where fast response, precise clamping, and long-term stability are critical.
FAQ
What is the clamping voltage of SMAJ28CA-M3/61 under a 10/1000 μs surge?
The SMAJ28CA-M3/61 clamps to a maximum of 45.4 V when subjected to its rated peak pulse current of 8.8 A under the standardized 10/1000 μs waveform. This value is measured at the device terminals and defines the upper voltage limit imposed on protected circuitry during transient events, ensuring downstream components remain within safe operating limits.
Is SMAJ28CA-M3/61 suitable for automotive applications?
Yes - the SMAJ28CA-M3/61 is halogen-free and RoHS-compliant, and its HM3 variant is AEC-Q101 qualified. While the M3 suffix itself denotes halogen-free commercial grade, ordering with HM3 (e.g., SMAJ28CAHM3_A/H) provides full automotive qualification including stress testing per AEC-Q101, making it appropriate for engine control units, body electronics, and ADAS subsystems.
How does SMAJ28CA-M3/61 differ from unidirectional SMAJ28A-M3/61?
The SMAJ28CA-M3/61 is bidirectional and provides symmetrical clamping for both positive and negative transients, whereas SMAJ28A-M3/61 is unidirectional with a marked cathode band and only clamps in reverse bias. The "CA" suffix explicitly indicates bidirectional functionality, enabling use on AC-coupled lines or differential buses where polarity is undefined or alternating.
What is the maximum reverse leakage current of SMAJ28CA-M3/61 at its stand-off voltage?
At its 28 V stand-off voltage (VWM), the SMAJ28CA-M3/61 exhibits a maximum reverse leakage current of 1.0 μA at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes standby power loss in battery-operated systems, supporting reliable long-term operation without drift or false triggering.
What PCB layout guidance applies to SMAJ28CA-M3/61 for optimal thermal performance?
For reliable thermal management, SMAJ28CA-M3/61 must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. Smaller pads increase junction temperature rise beyond the rated 120 °C/W RθJA, risking premature failure during repetitive surge events - especially critical in automotive and industrial applications with elevated ambient temperatures.
SMAJ28CA-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):
- 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-M3/61 FAQ
1.How can I place an order for SMAJ28CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28CA-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 SMAJ28CA-M3/61 reliable?
The price and inventory of SMAJ28CA-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 SMAJ28CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ28CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28CA-M3/61?
SMAJ28CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28CA-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 SMAJ28CA-M3/61?
For technical support, including SMAJ28CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ28CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ28CA-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 SMAJ28CA-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ28CA-M3/61?
All SMAJ28CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28CA-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 SMAJ28CA-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ28CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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