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Vishay General Semiconductor - Diodes Division SMAJ28CA-E3/61
- Part No.:
- SMAJ28CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28CA-E3/61.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:26,373
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Product details
Overview
SMAJ28CA-E3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 28 V standoff 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, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMAJ28CA-E3/61 datasheet, SMAJ28CA-E3/61 pinout, SMAJ28CA-E3/61 application, or SMAJ28CA-E3/61 equivalent, key selection criteria include bidirectional clamping symmetry, low clamping ratio (VC/VBR ≈ 1.43), MSL Level 1 moisture sensitivity, AEC-Q101 qualification eligibility (via HE3 suffix variants), and DO-214AC package compatibility with automated SMT placement.
Technical Context
This device operates as a silicon avalanche diode with symmetrical bidirectional conduction - enabling identical clamping behavior in both polarities without external polarity management. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at 28 V), while the low incremental surge resistance supports fast energy diversion during ESD or lightning-induced transients.
The SMAJ28CA-E3/61 delivers repeatable 400 W surge handling up to TJ = 150 °C when mounted on 5.0 mm × 5.0 mm copper pads, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), making it suitable for compact PCB layouts where localized heating must be managed.
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 - Confirmed bidirectional avalanche threshold range under standardized test conditions |
| VC @ IPPM | 45.4 V at 8.8 A - Clamped voltage during 10/1000 μs surge, defining worst-case downstream voltage stress |
| PPPM | 400 W - Peak pulse power capability with 10/1000 μs waveform, derated above 25 °C per Fig. 2 |
| IR @ VWM | <1 μA - Reverse leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| Package | SMA (DO-214AC) - Surface-mount outline with 2.54 mm lead pitch, compatible with standard reflow profiles (peak 260 °C) |
| Operating Temp | −55 °C to +150 °C - Full specification compliance across extended industrial and automotive ambient ranges |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity-unmarked for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Transient current entry point (bidirectional) | Accepts surge current in either polarity; no cathode marking required |
| Cathode (Terminal 2) | Transient current exit point (bidirectional) | Completes low-impedance path to ground or rail during clamping event |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR and VC performance in both directions eliminates need for polarity-aware layout |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) without degradation when properly mounted |
| Low clamping ratio (VC/VBR ≈ 1.43) | Minimizes voltage overshoot on protected ICs such as CAN transceivers or ADC front-ends |
| MSL Level 1 rating | Enables direct placement without baking; compatible with standard J-STD-020 reflow profiles |
| AEC-Q101 qualification path | HE3/HM3 suffix variants are automotive-qualified - same die and construction as SMAJ28CA-E3/61 |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN/CAN bus nodes and temperature/pressure sensors against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and chassis ground to clamp transients before reaching MCU or transceiver input. Use Value: Maintains signal integrity below 45.4 V during 8.8 A surges, preventing latch-up or damage to 3.3 V/5 V interface ICs. | Use Scenario: Shielding analog input channels (e.g., 4–20 mA loops) and digital outputs from field-induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp on terminal blocks and connector interfaces exposed to motor switching noise. Use Value: Withstands repetitive 400 W pulses without parameter drift, ensuring long-term reliability in harsh EMI environments. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Guarding Ethernet PHY magnetics or DSL line drivers against induced lightning surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: First-stage protection device bridging unshielded twisted pair to isolated data converter or transformer center tap. Use Value: Fast response time and low capacitance (<100 pF at 0 V) preserve signal rise/fall times up to 100 Mbps. | Use Scenario: Secondary-side transient suppression on DC output rails of wall adapters powering USB peripherals or smart home hubs. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA) clamping element placed after primary DC/DC regulator to protect downstream LDOs and PMICs. Use Value: Prevents brownout or reset events caused by ripple coupling from AC/DC converter switching noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/61 | Unidirectional variant; cathode band marked; VF = 3.5 V at 25 A forward conduction | Requires explicit polarity alignment; unsuitable for AC-coupled or floating differential lines | Select only if circuit topology mandates unidirectional clamping with known ground reference |
| SMBJ28CA-E3/52 | Same VWM/VBR/VC specs but in SMB (DO-214AA) package - 3.5 mm × 3.5 mm footprint vs. SMA's 4.5 mm × 2.5 mm | Higher thermal resistance (RθJA = 140 °C/W) limits sustained surge duty cycle in dense layouts | Choose when board space is constrained and peak pulse repetition rate is low |
Compared with SMAJ28A-E3/61 and SMBJ28CA-E3/52, the SMAJ28CA-E3/61 uniquely balances bidirectional symmetry, industry-standard SMA footprint, and verified 400 W surge capacity - making it optimal for mixed-signal interfaces where polarity independence and layout flexibility are critical.
Availability
SMAJ28CA-E3/61 is available at Aetrix Electronics and suitable for automotive sensor systems, industrial programmable logic controllers, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ28CA-E3/61 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 targets board-level transient protection across automotive, industrial, and communications markets - engineered for rapid response, low clamping, and seamless integration into high-volume SMT manufacturing flows.
FAQ
What is the clamping voltage of SMAJ28CA-E3/61 under a 10/1000 μs surge?
The SMAJ28CA-E3/61 exhibits a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current of 8.8 A using the standardized 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMAJ28CA-E3/61 RoHS-compliant and halogen-free?
Yes, SMAJ28CA-E3/61 carries the "E3" suffix, indicating full RoHS compliance per EU Directive 2011/65/EU. It is not halogen-free; for halogen-free versions, specify the "M3" suffix (e.g., SMAJ28CA-M3/61), which meets IEC 61249-2-21 requirements.
Does SMAJ28CA-E3/61 have AEC-Q101 qualification?
The base SMAJ28CA-E3/61 is commercial-grade and not AEC-Q101 qualified. However, the functionally identical automotive-grade variant SMAJ28CAHE3_A/H is AEC-Q101 qualified and shares the same electrical specifications, package, and thermal performance - differing only in test reporting and traceability documentation.
What is the thermal resistance of SMAJ28CA-E3/61?
SMAJ28CA-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, and a junction-to-lead resistance (RθJL) of 30 °C/W. These values assume standard JEDEC test board conditions and guide heatsinking decisions for high-duty-cycle applications.
Can SMAJ28CA-E3/61 replace SMAJ28A-E3/61 in an existing design?
No - SMAJ28CA-E3/61 is bidirectional while SMAJ28A-E3/61 is unidirectional. Substituting them requires verifying circuit polarity, grounding scheme, and clamping directionality. In AC-coupled or floating differential lines, SMAJ28CA-E3/61 is mandatory; in DC-ground-referenced unidirectional paths, SMAJ28A-E3/61 may offer lower forward voltage but risks failure if reverse-biased.
SMAJ28CA-E3/61 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-E3/61 FAQ
1.How can I place an order for SMAJ28CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28CA-E3/61 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-E3/61 reliable?
The price and inventory of SMAJ28CA-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ28CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ28CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28CA-E3/61?
SMAJ28CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28CA-E3/61 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-E3/61?
For technical support, including SMAJ28CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ28CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ28CA-E3/61 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-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ28CA-E3/61?
All SMAJ28CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28CA-E3/61, 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-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ28CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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