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Vishay General Semiconductor - Diodes Division SMA5J28CA-E3/5A
- Part No.:
- SMA5J28CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J28CA-E3/5A.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA5J28CA-E3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge 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 clamping voltage (VC) at 11.0 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line conditioning.
For engineers reviewing the SMA5J28CA-E3/5A datasheet, SMA5J28CA-E3/5A pinout, SMA5J28CA-E3/5A application, or SMA5J28CA-E3/5A equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification eligibility (via HE3/HM3 variants), RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, delivering consistent clamping performance without polarity dependency. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and low incremental surge resistance, enabling precise overvoltage limiting during fast transients such as ESD (IEC 61000-4-2) and lightning-induced surges (IEC 61000-4-5).
Thermal design is supported by RθJA = 80 °C/W (typ.) and RθJL = 25 °C/W (typ.), with operation rated from –55 °C to +150 °C junction temperature. The device meets MSL level 1 per J-STD-020 and withstands 260 °C lead-free reflow peak temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on under surge conditions without premature leakage. |
| VC @ IPPM | 45.4 V at 11.0 A - Clamped voltage during 500 W 10/1000 µs surge; determines maximum stress imposed on protected downstream ICs. |
| PPPM | 500 W - Peak pulse power handling capacity; enables robust protection against high-energy transients like inductive switch-off spikes. |
| IPPM | 11.0 A - Peak pulse current corresponding to 500 W rating; used to size PCB trace width and verify thermal derating above 25 °C. |
| Junction Temp Range | –55 °C to +150 °C - Full operational range supports under-hood automotive, industrial control, and outdoor telecom deployments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); cathode band omitted per bidirectional construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts surge current in either direction when voltage exceeds VBR. |
| Case (body) | Thermal and mechanical interface | Plastic-molded body meets UL 94 V-0; transfers heat to PCB copper pads (recommended 5.0 mm × 5.0 mm per terminal). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns - e.g., RS-485, CAN FD, or Ethernet PHY interfaces. |
| 500 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge immunity when properly mounted, reducing need for cascaded protection stages. |
| Glass-passivated junction | Ensures long-term VBR stability and low leakage (<1.0 μA at VWM) across temperature and lifetime - critical for battery-powered sensors. |
| MSL Level 1 / 260 °C compatible | Permits standard lead-free reflow without pre-baking; eliminates moisture-related popcorning risk in high-volume SMT assembly. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and alternator ripple in 12 V vehicle systems. IC Role / Device Role: Bidirectional voltage clamp placed between signal line and ground, absorbing transients up to 500 W without latch-up. Use Value: Maintains VC ≤ 45.4 V during 11.0 A surges, keeping protected MCU ADC inputs within safe input range and avoiding system reset. |
Use Scenario: Shielding digital input modules in programmable logic controllers from field-wiring induced surges (e.g., relay coil de-energization). IC Role / Device Role: Primary surge suppression element on 24 V DC input channels, installed upstream of optocoupler isolation barriers. Use Value: Withstands ≥1000 surges at rated PPPM while maintaining <1.0 μA leakage at 28 V, preserving input impedance integrity over time. |
| Telecom Line Interface | Consumer USB Port Protection |
Use Scenario: Safeguarding Ethernet PHY differential pairs and PoE detection circuitry against lightning-induced common-mode transients on outdoor cabling. IC Role / Device Role: Common-mode TVS pair (one per line) referenced to chassis ground, leveraging symmetrical bidirectional response. Use Value: Clamps transients within 1 ns response time to <45.4 V, preventing damage to 100BASE-TX magnetics and PHY transceivers. |
Use Scenario: Adding secondary-level surge immunity to USB 2.0 data lines (D+/D−) in portable media players and docking stations. IC Role / Device Role: Low-capacitance bidirectional clamp placed after primary ESD diodes, targeting higher-energy events beyond IEC 61000-4-2. Use Value: Delivers 500 W surge handling without degrading signal integrity - junction capacitance not specified but typical for SMA-class TVS is <100 pF at 0 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J28A-E3/5A | Unidirectional variant; includes cathode band marking and forward voltage drop (~3.5 V at 25 A); same VWM, VBR, VC, and PPPM. | Requires polarity-aware layout; unsuitable for AC or floating signals; preferred where DC bias is fixed and forward conduction must be blocked. | Select SMA5J28A-E3/5A only when protecting unidirectional DC rails (e.g., 28 V supply lines) and polarity alignment can be guaranteed. |
| SMBJ28CA-E3/52 | Same VWM/VBR/VC specs but in larger SMB (DO-214AA) package; higher thermal mass (RθJA ≈ 60 °C/W); 600 W PPPM. | Better thermal performance under repeated surges; requires larger PCB footprint (4.57 mm × 3.94 mm vs. SMA's 4.93 mm × 3.99 mm); not drop-in compatible. | Choose SMBJ28CA-E3/52 when sustained surge duty cycle exceeds 1 Hz or ambient temperature exceeds 85 °C - otherwise SMA5J28CA-E3/5A offers optimal space/power density. |
Compared with SMA5J28A-E3/5A, SMA5J28CA-E3/5A eliminates polarity constraints for AC-coupled paths; versus SMBJ28CA-E3/52, it trades 100 W peak power and thermal margin for 25 % smaller board area and identical automated placement compatibility.
Availability
SMA5J28CA-E3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line conditioning requiring stable component supply, RoHS compliance, and AEC-Q101 qualification readiness.
Supply support for SMA5J28CA-E3/5A 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power density, and automotive-grade qualification.
The SMA5J series is engineered for high-power-density transient suppression in space-constrained, high-reliability applications - particularly targeting automotive, industrial, and telecom systems exposed to repetitive surge stress.
FAQ
What is the clamping voltage of SMA5J28CA-E3/5A at its rated peak pulse current?
The SMA5J28CA-E3/5A has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current of 11.0 A using a 10/1000 µs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMA5J28CA-E3/5A maintains this clamping performance bidirectionally.
Is SMA5J28CA-E3/5A RoHS-compliant and lead-free assembly compatible?
Yes, SMA5J28CA-E3/5A carries the "E3" suffix, indicating full RoHS compliance and qualification for lead-free reflow soldering with a maximum peak temperature of 260 °C. Its matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability requirements, and the device is rated MSL Level 1 - no baking required prior to SMT placement. The SMA5J28CA-E3/5A is manufactured using halogen-free molding compound.
Does SMA5J28CA-E3/5A have AEC-Q101 qualification?
The base SMA5J28CA-E3/5A is commercial-grade and not AEC-Q101 qualified; however, Vishay offers automotive-qualified variants under ordering codes SMA5J28CAHE3_A/I (RoHS + AEC-Q101) and SMA5J28CAHM3_A/I (halogen-free + RoHS + AEC-Q101). These share identical electrical specs and SMA package but include extended reliability testing per AEC-Q101. SMA5J28CA-E3/5A serves as the commercial foundation for those qualified versions.
What is the reverse leakage current of SMA5J28CA-E3/5A at its stand-off voltage?
At the 28 V stand-off voltage (VWM) and 25 °C ambient temperature, the SMA5J28CA-E3/5A exhibits a maximum reverse leakage current (ID) of 1.0 μA. This low leakage preserves signal integrity in high-impedance circuits (e.g., sensor front-ends) and minimizes standby power loss in battery-operated systems. Leakage remains within specification across the full operating temperature range of –55 °C to +150 °C.
How does the SMA5J28CA-E3/5A differ from unidirectional SMA5J28A-E3/5A in circuit implementation?
The SMA5J28CA-E3/5A is bidirectional with no polarity marking, allowing placement on AC-coupled, floating, or differential lines without orientation concern - unlike the unidirectional SMA5J28A-E3/5A, which requires correct cathode alignment and blocks forward conduction. Both share identical VWM, VBR, VC, and PPPM, but SMA5J28A-E3/5A adds a forward voltage drop (~3.5 V at 25 A) and is unsuitable for symmetric surge paths. SMA5J28CA-E3/5A is mandatory for RS-485, CAN, or Ethernet protection.
SMA5J28CA-E3/5A 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):
- 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)
SMA5J28CA-E3/5A FAQ
1.How can I place an order for SMA5J28CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J28CA-E3/5A 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 SMA5J28CA-E3/5A reliable?
The price and inventory of SMA5J28CA-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J28CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J28CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J28CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J28CA-E3/5A?
SMA5J28CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J28CA-E3/5A 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 SMA5J28CA-E3/5A?
For technical support, including SMA5J28CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J28CA-E3/5A requirements.
6.How does Aetrix verify that SMA5J28CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J28CA-E3/5A 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 SMA5J28CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J28CA-E3/5A?
All SMA5J28CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J28CA-E3/5A, 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 SMA5J28CA-E3/5A part is unused and in its original packaging.
Return procedure for SMA5J28CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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