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Vishay General Semiconductor - Diodes Division SMAJ28C-E3/61
- Part No.:
- SMAJ28C-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28C-E3/61.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,215
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Product details
Overview
SMAJ28C-E3/61 from Vishay General Semiconductor is a bi-directional surface-mount Transient Voltage Suppressor (TVS) in DO-214AC (SMA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning. It features 28 V stand-off voltage (VWM), 50.0 V maximum clamping voltage (VC) at 8.0 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 µs waveform).
For engineers reviewing the SMAJ28C-E3/61 datasheet, SMAJ28C-E3/61 pinout, SMAJ28C-E3/61 application, or SMAJ28C-E3/61 equivalent, this device serves as a RoHS-compliant, MSL Level 1 rated TVS for ESD and surge protection on signal lines, power rails, and sensor interfaces in automotive, industrial, and telecom systems.
Technical Context
The SMAJ28C-E3/61 is a bi-directional avalanche diode with symmetrical breakdown characteristics in both polarities, enabling bidirectional transient suppression without polarity sensitivity. Its glass-passivated junction ensures stable VBR (31.1–38.0 V) and low incremental surge resistance, supporting fast response time (<1 ps) and excellent clamping performance under repetitive 10/1000 µs surges.
Rated for -55 °C to +150 °C operating junction temperature and compliant with AEC-Q101 when specified with HE3 suffix, the SMAJ28C-E3/61 operates with ≤1.0 µA reverse leakage at 28 V and delivers 400 W peak pulse power up to 78 V - derated to 300 W above that threshold per Fig. 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VC @ IPPM | 50.0 V - Clamped voltage at 8.0 A peak pulse current; limits downstream IC stress during 10/1000 µs transients. |
| IPPM | 8.0 A - Peak surge current capability under standard 10/1000 µs waveform; determines minimum survivable surge level. |
| PPPM | 400 W - Peak pulse power rating at TA = 25 °C on 5.0 × 5.0 mm copper pads; defines transient energy absorption capacity. |
| VBR min/max | 31.1 V / 38.0 V - Breakdown voltage range at 1.0 mA test current; ensures consistent turn-on across production lots. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
Pinout & Package
DO-214AC (SMA) package: surface-mount, low-profile, bi-directional configuration with no polarity marking; terminals are matte tin-plated leads solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche junction | No cathode band; identical electrical behavior in either direction - simplifies PCB layout and eliminates polarity orientation checks. |
| Case (exposed pad not present) | Non-conductive molded body | DO-214AC plastic case provides UL 94 V-0 flammability rating and mechanical robustness without thermal pad requirements. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional suppression | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, USB D+/D−) without external polarity management. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 Ω source impedance) surges when mounted on recommended 5.0 × 5.0 mm copper pads. |
| MSL Level 1 rating | Allows unlimited floor life and reflow at peak 260 °C without baking - compatible with standard SMT assembly processes. |
| RoHS-compliant E3 suffix | Meets JESD201 Class 1A whisker resistance and EU Directive 2002/95/EC; suitable for commercial-grade industrial and consumer applications. |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus |
|---|---|
Use Scenario: Protecting ABS wheel speed sensor outputs from load dump and alternator ripple-induced transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Bi-directional TVS placed directly at connector entry point to clamp ±50 V spikes before reaching signal conditioning amplifier. Use Value: Maintains 28 V VWM margin over 14 V nominal rail while limiting clamping to 50.0 V - preserving ADC input integrity and preventing latch-up. | Use Scenario: Shielding differential data lines in factory automation PLCs exposed to motor drive noise and relay coil kickback. IC Role / Device Role / Timing Role: Paired SMAJ28C-E3/61 devices (one per line) suppress common-mode surges on RS-485 A/B bus lines without distorting signal edges. Use Value: 8.0 A IPPM and 50.0 V VC ensure compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) immunity requirements up to Level 3. |
| Telecom Power Input | Consumer USB Port Protection |
Use Scenario: Safeguarding 24 V DC input stage of VoIP gateways against lightning-induced surges entering via PoE or external power adapters. IC Role / Device Role / Timing Role: Primary front-end TVS on DC input rail, coordinated with downstream polymer PTC and secondary filtering. Use Value: 400 W PPPM and 150 °C TJ max enable reliable operation under repeated 10/1000 µs transients without thermal runaway or parameter drift. | Use Scenario: Adding transient immunity to USB 2.0 upstream ports in smart home hubs subjected to ESD events during cable insertion. IC Role / Device Role / Timing Role: Bi-directional clamping element between VBUS and GND, sized to handle ±15 kV contact ESD per IEC 61000-4-2. Use Value: Sub-1 µA leakage at 28 V prevents standby current drain; DO-214AC footprint allows placement within tight USB connector keepouts. |
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 | Identical electrical specs and packaging; CA suffix denotes same bi-directional construction as C - no functional difference. | No distinction in use cases; both rated for same VWM, VC, and PPPM. | Select SMAJ28C-E3/61 or SMAJ28CA-E3/61 interchangeably based on distributor stock; CA variant may reflect minor internal revision tracking. |
| SMCJ28C-E3/61 | Same VWM and VC, but higher 1500 W PPPM and larger DO-214AB (SMC) package - 7.11 × 6.22 mm vs. SMA's 4.50 × 2.79 mm. | Suitable where higher surge energy handling is required and board space permits larger footprint. | Choose SMCJ28C-E3/61 only if system-level testing confirms need for >400 W surge margin; otherwise SMAJ28C-E3/61 offers optimal size/power balance. |
Compared with SMAJ28CA-E3/61 (functionally identical) and SMCJ28C-E3/61 (higher-power, larger-package alternative), the SMAJ28C-E3/61 delivers best-in-class 400 W surge protection in the smallest standardized surface-mount TVS outline - critical for space-constrained automotive and portable industrial designs.
Availability
SMAJ28C-E3/61 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial RS-485 bus hardening, and telecom power input surge suppression requiring stable component supply and full traceability.
Supply support for SMAJ28C-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 is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where compact size, high surge rating, and AEC-Q101 readiness are essential design criteria.
FAQ
What does the 'C' suffix in SMAJ28C-E3/61 indicate?
The 'C' suffix in SMAJ28C-E3/61 specifies a bi-directional Transient Voltage Suppressor configuration. Unlike uni-directional variants (e.g., SMAJ28A-E3/61), the SMAJ28C-E3/61 provides symmetrical clamping in both polarities - making it ideal for protecting AC-coupled or floating signal paths such as RS-485, CAN, or audio lines without polarity constraints.
Is SMAJ28C-E3/61 suitable for automotive applications?
SMAJ28C-E3/61 meets commercial-grade specifications per the Vishay datasheet (Document 88390). For automotive applications requiring AEC-Q101 qualification, the HE3-suffix variant (e.g., SMAJ28CHE3/61) must be selected. The standard SMAJ28C-E3/61 is appropriate for non-safety-critical automotive subsystems where full qualification is not mandated.
What is the maximum clamping voltage of SMAJ28C-E3/61 at its rated peak pulse current?
The maximum clamping voltage (VC) of SMAJ28C-E3/61 is 50.0 V at 8.0 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and ensures downstream circuitry remains within safe voltage limits during transient events.
How does the DO-214AC (SMA) package of SMAJ28C-E3/61 affect thermal performance?
The DO-214AC (SMA) package of SMAJ28C-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 5.0 × 5.0 mm copper pads. This limits sustained power dissipation but is optimized for short-duration transients; for continuous thermal management, PCB copper area and airflow must be designed to avoid exceeding the +150 °C maximum junction temperature.
Can SMAJ28C-E3/61 replace SMAJ28A-E3/61 in a design?
No - SMAJ28C-E3/61 is bi-directional, while SMAJ28A-E3/61 is uni-directional with cathode marking. Substituting them requires verifying circuit topology: SMAJ28C-E3/61 may be used in place of SMAJ28A-E3/61 only if the protected node is floating or AC-coupled and polarity independence is confirmed. Reverse substitution risks open-circuit failure during negative transients.
SMAJ28C-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 50V
- Current - Peak Pulse (10/1000µs):
- 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)
SMAJ28C-E3/61 FAQ
1.How can I place an order for SMAJ28C-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28C-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 SMAJ28C-E3/61 reliable?
The price and inventory of SMAJ28C-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 SMAJ28C-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ28C-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28C-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28C-E3/61?
SMAJ28C-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28C-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 SMAJ28C-E3/61?
For technical support, including SMAJ28C-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28C-E3/61 requirements.
6.How does Aetrix verify that SMAJ28C-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ28C-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 SMAJ28C-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ28C-E3/61?
All SMAJ28C-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28C-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 SMAJ28C-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ28C-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ28C-E3/61 Tags
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