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Vishay General Semiconductor - Diodes Division SMA5J28A-E3/61
- Part No.:
- SMA5J28A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J28A-E3/61.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA5J28A-E3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on power and signal lines. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V clamping voltage (VC) at 11.0 A peak pulse current (IPPM), and 500 W peak pulse power (PPPM) with 10/1000 μs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMA5J28A-E3/61 datasheet, SMA5J28A-E3/61 pinout, SMA5J28A-E3/61 application, or SMA5J28A-E3/61 equivalent, key selection criteria include clamping performance under 10/1000 μs surges, thermal resistance (RθJA = 80 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped crowbar device during transients, leveraging a glass-passivated silicon junction for sub-nanosecond response and low incremental surge resistance. Its unidirectional configuration enables integration into DC-biased rails where reverse conduction must be blocked.
Rated for -55 °C to +150 °C junction temperature, it meets MSL Level 1 (260 °C peak reflow) and supports 40 A non-repetitive forward surge (IFSM) - critical for protecting downstream components against inductive switching spikes and lightning-induced surges in 24 V automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for 24 V supply rail protection. |
| VBR min/max | 31.1 V / 34.4 V at 1 mA - tight breakdown tolerance ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 45.4 V at 11.0 A - clamping voltage limits stress on protected ICs during 10/1000 μs surge events per IEC 61000-4-5. |
| PPPM | 500 W - peak pulse power handling capability with standard 10/1000 μs waveform; determines survivability of defined surge energy. |
| RθJA | 80 °C/W - junction-to-ambient thermal resistance under standard PCB pad layout; governs power derating above 25 °C ambient. |
| Polarity | Unidirectional - cathode marked by band; blocks reverse current while clamping positive transients on anode-cathode path. |
| Package | SMA (DO-214AC) - surface-mount package with 5.28 mm × 4.50 mm footprint, optimized for high-density PCB layouts and automated assembly. |
Pinout & Package
Two-terminal device in SMA (DO-214AC) package: anode and cathode terminals aligned along axial body. Cathode identified by molded band. No internal pin numbering; terminals are electrically symmetric except for polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected line (e.g., 24 V rail); conducts surge current toward cathode during overvoltage event. |
| Cathode | Output/Ground reference terminal | Marked by band; tied to system ground or low-impedance return path; establishes clamping reference point. |
Key Features
| Feature | Design Value |
|---|---|
| Low profile SMA package | Height ≤ 2.29 mm - enables use in space-constrained modules such as ADAS ECUs and motor control boards. |
| Glass passivated junction | Enhanced reliability and moisture resistance - meets JESD22-A101 humidity testing requirements for automotive environments. |
| MSL Level 1 rating | Compatible with standard lead-free reflow profiles up to 260 °C peak - eliminates pre-bake requirement for SMT line integration. |
| AEC-Q101 qualification option | Available in HE3 suffix variant - validated for automotive-grade temperature cycling, HTRB, and ESD robustness per AEC-Q101 Rev D. |
| Matte tin plated leads | Solderable per J-STD-002 and JESD22-B102 - ensures consistent wetting and joint integrity in high-volume reflow processes. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V battery-fed microcontroller power inputs against load dump and alternator ripple in engine control units. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient energy before it reaches LDO regulators and MCU VDD pins. Use Value: Limits voltage excursion to ≤45.4 V during 10/1000 μs surges, preventing latch-up or gate oxide damage in 3.3 V/5 V logic domains. |
Use Scenario: Shielding analog output lines of pressure or temperature sensors from ESD and cable discharge events in factory automation PLCs. IC Role / Device Role / Timing Role: Fast-response shunt element placed at connector entry point to divert >8 kV HBM ESD pulses. Use Value: Sub-1 ns response time and 45.4 V clamping ensure sensor signal integrity remains intact during ±15 kV contact discharge per IEC 61000-4-2. |
| DC-DC Converter Input Stage | Telecom Line Card Surge Suppression |
Use Scenario: Safeguarding input stage of isolated 24 V to 5 V flyback converters in PoE-powered edge devices. IC Role / Device Role / Timing Role: Primary-side transient limiter absorbing inductive kickback from primary winding during MOSFET switching faults. Use Value: 500 W PPPM rating sustains repeated 100 A surge events without degradation when mounted on 5 mm × 5 mm copper pads. |
Use Scenario: Front-end protection for Ethernet PHY power rails in telecom base station line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed between DC bias feed and PHY IC to clamp common-mode transients on 48 V phantom power lines. Use Value: 28 V VWM allows stable operation across full 48 V ±10% range while clamping surges to <46 V - within PHY absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J28A-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package; same thermal and surge ratings. | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy. | Direct substitution where halogen-free material declaration is required; no layout or test changes needed. |
| SMA5J28AHE3_A/61 | AEC-Q101 qualified version with extended reliability testing (HTGB, TC, UHAST); identical VWM/VBR/VC/PPPM. | Required for automotive safety-critical modules (e.g., ADAS, body control) needing certified component qualification. | Preferred for automotive Tier 1 designs requiring AEC-Q101 evidence; otherwise, E3/61 suffices for commercial/industrial use. |
Compared with SMA5J28A-E3/61, the M3/61 variant adds halogen-free compliance without altering surge performance, while the HE3_A/61 variant adds AEC-Q101 qualification for automotive deployment - both retain identical pinout, footprint, and clamping behavior.
Availability
SMA5J28A-E3/61 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and DC-DC converter input stage surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMA5J28A-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, power density, and automotive qualification.
The SMA5J series targets high-power-density transient suppression in space-constrained applications, delivering 500 W surge capability in the compact SMA package for automotive, industrial, and telecom infrastructure designs.
FAQ
What is the clamping voltage of the SMA5J28A-E3/61 under a 10/1000 µs surge?
The SMA5J28A-E3/61 has a maximum clamping voltage (VC) of 45.4 V at 11.0 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 5.0 mm × 5.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMA5J28A-E3/61 maintains this clamping performance across its specified operating temperature range.
Is the SMA5J28A-E3/61 suitable for automotive applications?
The SMA5J28A-E3/61 is rated for -55 °C to +150 °C junction temperature and meets MSL Level 1 reflow standards, making it suitable for under-hood and cabin automotive environments. While the base E3/61 variant is commercial-grade, the AEC-Q101-qualified SMA5J28AHE3_A/61 variant is recommended for safety-critical automotive systems. The SMA5J28A-E3/61 itself is widely deployed in non-safety automotive subsystems such as lighting control and infotainment power rails.
What does the "E3/61" suffix mean in SMA5J28A-E3/61?
In SMA5J28A-E3/61, "E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads, and "61" specifies the preferred packaging format: 7-inch diameter plastic tape and reel containing 1800 units. This packaging supports high-speed pick-and-place assembly and complies with J-STD-002 solderability standards. The SMA5J28A-E3/61 is not halogen-free (that requires M3 suffix) nor AEC-Q101 qualified (which requires HE3 or HM3).
How does the SMA5J28A-E3/61 differ from bidirectional TVS diodes like SMA5J28CA?
The SMA5J28A-E3/61 is unidirectional and blocks reverse current while clamping positive transients, whereas SMA5J28CA is bidirectional and clamps surges of either polarity. The SMA5J28A-E3/61 has a cathode band marking and is intended for DC-biased lines; SMA5J28CA lacks polarity marking and suits AC-coupled or floating signal paths. Their VWM, VBR, and VC values differ due to structural asymmetry - SMA5J28A-E3/61 has 28 V VWM, while SMA5J28CA has 24 V VWM.
What PCB layout guidance applies to the SMA5J28A-E3/61 for optimal thermal performance?
For optimal thermal performance, the SMA5J28A-E3/61 must be mounted on minimum recommended copper pads: 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal, per Vishay's datasheet Figure 2 derating curve. Use internal or external copper planes connected via multiple vias to enhance heat dissipation. Avoid narrow traces between the SMA5J28A-E3/61 and ground/power planes, as excessive trace resistance increases clamping voltage during surge events.
SMA5J28A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 11A
- 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)
SMA5J28A-E3/61 FAQ
1.How can I place an order for SMA5J28A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J28A-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 SMA5J28A-E3/61 reliable?
The price and inventory of SMA5J28A-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 SMA5J28A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMA5J28A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J28A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J28A-E3/61?
SMA5J28A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J28A-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 SMA5J28A-E3/61?
For technical support, including SMA5J28A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J28A-E3/61 requirements.
6.How does Aetrix verify that SMA5J28A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMA5J28A-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 SMA5J28A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMA5J28A-E3/61?
All SMA5J28A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J28A-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 SMA5J28A-E3/61 part is unused and in its original packaging.
Return procedure for SMA5J28A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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