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Vishay General Semiconductor - Diodes Division SMA6J28A-E3/5A
- Part No.:
- SMA6J28A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J28A-E3/5A.pdf
- Description:
- TVS DIODE 28VWM 51.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA6J28A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR at IT = 1 mA), 44.0 V maximum clamping voltage at 13.6 A (10/1000 µs), 600 W peak pulse power (10/1000 µs), and operates from –55 °C to +150 °C. It protects MOSFETs and ICs in industrial power supplies.
For engineers reviewing the SMA6J28A-E3/5A datasheet, SMA6J28A-E3/5A pinout, SMA6J28A-E3/5A application, or SMA6J28A-E3/5A equivalent, key selection criteria include unidirectional polarity, 44.0 V clamping at 13.6 A, SMA package thermal resistance (RθJA = 120 °C/W), 0.2 µA leakage at 28 V, and compliance with J-STD-020 MSL level 1.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<0.2 µA leakage at VWM = 28 V), then rapidly avalanches when transient voltage exceeds VBR (31.1–34.4 V), limiting downstream voltage to ≤44.0 V at 13.6 A (10/1000 µs). Its dynamic resistance is 0.704 Ω, enabling precise clamping control.
It is rated for 50 A non-repetitive forward surge current (8.3 ms half-sine), supports automated SMT placement, and meets UL 94 V-0 flammability. The cathode band denotes polarity, and terminals are matte tin-plated per J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working range for protected circuit. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - Breakdown threshold range; ensures reliable triggering above system nominal voltage with margin. |
| VC @ IPP | 44.0 V at 13.6 A (10/1000 µs) - Clamped voltage during standard surge; determines maximum stress on downstream components. |
| PPPM (10/1000 µs) | 600 W - Peak transient energy handling capacity under industry-standard waveform; defines surge robustness class. |
| IFSM | 50 A - Single half-sine surge current rating (8.3 ms); validates survivability against inrush or fault currents. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on PCB with 5.0 mm × 5.0 mm copper pads; informs derating requirements. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in high-ambient industrial environments without thermal shutdown. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with UL 94 V-0 molding compound. Cathode indicated by color band. Matte tin-plated leads, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or transient clamping | Connected to protected line's lower-potential side (e.g., ground return path); defines unidirectional clamping direction. |
| Cathode | Current exit terminal during clamping; marked with color band | Connected to protected line's higher-potential side (e.g., 28 V rail); avalanche conduction occurs when cathode-to-anode voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional polarity only | Enables precise clamping on DC-biased lines (e.g., 28 V supply rails) without reverse conduction during normal operation. |
| Clamping voltage ≤44.0 V at 13.6 A | Guarantees downstream ICs and MOSFETs experience no more than 44.0 V during standardized 10/1000 µs surges. |
| MSL Level 1 (J-STD-020) | Supports lead-free reflow up to 260 °C peak without moisture-induced damage-no baking required before assembly. |
| Dynamic resistance = 0.704 Ω | Minimizes voltage overshoot during fast transients; enables tighter clamping tolerance versus higher-RD TVS devices. |
| Leakage current ≤0.2 µA at 28 V | Prevents measurable power loss or signal distortion in always-on 28 V systems (e.g., industrial sensors, PLC I/O). |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 24–28 V DC input stages of programmable logic controllers (PLCs) and motor drives against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Shunt TVS device placed across input rail to clamp surges before they reach DC-DC converters and microcontrollers. Use Value: Withstands 600 W (10/1000 µs) and 4000 W (8/20 µs) surges while limiting voltage to 44.0 V-preserving 3.3 V/5 V logic integrity downstream. |
Use Scenario: Safeguarding LIN bus transceivers and power management ICs in BCMs exposed to battery voltage spikes during alternator load dump. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN line and ground to suppress negative-going transients and clamp positive spikes to ≤44.0 V. Use Value: 0.2 µA leakage at 28 V avoids false wake-up or current drain; MSL Level 1 ensures compatibility with automotive SMT reflow profiles. |
| Telecom DC Power Feeds | Industrial Sensor Signal Conditioning |
Use Scenario: Protecting -48 V or +28 V telecom rectifier outputs and PoE midspan injectors from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary-level TVS mounted at board edge to divert 8/20 µs lightning surges (up to 4000 W) away from sensitive DC-DC isolation stages. Use Value: 44.0 V clamping at 13.6 A (10/1000 µs) and 51.6 V at 68 A (8/20 µs) provides validated surge margin per IEC 61000-4-5 Level 4. |
Use Scenario: Shielding analog front-end amplifiers and ADC inputs in pressure/temperature sensors connected to 28 V field wiring. IC Role / Device Role / Timing Role: Low-leakage (≤0.2 µA) TVS placed across sensor supply pins to suppress ESD and switching noise without affecting offset or gain accuracy. Use Value: RθJA = 120 °C/W allows stable operation at +85 °C ambient; DO-214AC footprint enables compact layout near connector entry points. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J28AHE3/5A | Same electrical specs, but halogen-free (M3 suffix) and RoHS-compliant; identical SMA package and pinout. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU industrial equipment). | Direct drop-in replacement if halogen-free certification is required; same thermal and clamping performance. |
| SMCJ28A-E3/57T | Higher power rating: 1500 W (10/1000 µs), 6000 W (8/20 µs); larger SMC (DO-214AB) package; VC = 45.4 V @ 33.0 A. | Better suited for higher-energy surges (e.g., 100 A 8/20 µs events); requires larger PCB pad area and higher thermal mass. | Choose when surge threat level exceeds 600 W; not pin-compatible-requires layout change due to SMC footprint. |
Compared with SMA6J28A-E3/5A, SMA6J28AHE3/5A offers identical protection in halogen-free form, while SMCJ28A-E3/57T delivers higher surge capacity at the cost of larger size and non-interchangeable packaging-making SMA6J28A-E3/5A optimal for space-constrained 600 W-class protection.
Availability
SMA6J28A-E3/5A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom DC feeds requiring stable component supply, RoHS compliance, and MSL Level 1 reflow capability.
Supply support for SMA6J28A-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, TVS, MOSFETs, and optoelectronics with emphasis on reliability and industrial-grade performance.
The SMA6J28A-E3/5A belongs to Vishay's TRANSZORB® family of transient voltage suppressors, engineered specifically for robust, low-profile protection of DC power rails and signal lines in harsh electromagnetic environments.
FAQ
What is the clamping voltage of the SMA6J28A-E3/5A under a 10/1000 µs surge?
The SMA6J28A-E3/5A has a maximum clamping voltage (VC) of 44.0 V at 13.6 A for a 10/1000 µs waveform. This value is measured per the standard test condition defined in the Vishay datasheet (Document Number: 89460), and directly determines the peak voltage imposed on protected circuitry during that surge event. The SMA6J28A-E3/5A maintains this clamping performance across its specified operating temperature range.
Is the SMA6J28A-E3/5A suitable for automotive applications?
Yes, the SMA6J28A-E3/5A is used in automotive body control modules (BCMs) for protecting 28 V power domains and LIN bus interfaces against load dump and ESD. It meets MSL Level 1 for lead-free reflow, operates from –55 °C to +150 °C, and provides 44.0 V clamping at 13.6 A-key requirements for under-hood and cabin electronics. The SMA6J28A-E3/5A is not AEC-Q200 qualified, so system-level validation is required.
What does the "E3/5A" suffix mean in SMA6J28A-E3/5A?
The "E3" denotes RoHS-compliant, industrial-grade construction with matte tin-plated leads; "5A" specifies the packaging format: 7500 units per 13-inch diameter plastic tape and reel. This differs from "E3/61", which uses 7-inch reels with 1800 units. Both share identical electrical and thermal specifications-the SMA6J28A-E3/5A is functionally identical to other SMA6J28A variants except for packaging and material compliance.
How does the leakage current of SMA6J28A-E3/5A affect low-power circuits?
The SMA6J28A-E3/5A exhibits ≤0.2 µA reverse leakage current at its 28 V stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage prevents measurable loading on battery-backed or energy-harvested systems, ensuring minimal impact on standby current budgets. In sensor nodes or IoT edge devices powered from 28 V rails, the SMA6J28A-E3/5A introduces negligible error or drift-critical for precision analog signal chains.
Can SMA6J28A-E3/5A be used in bidirectional configurations?
No, the SMA6J28A-E3/5A is unidirectional only, as explicitly stated in the Vishay datasheet. It conducts and clamps only when cathode voltage exceeds anode voltage by ≥31.1 V. For bidirectional protection (e.g., AC lines or data buses with ± transients), a separate device such as SMBJ28CA or a back-to-back SMA6J28A pair would be required. Using SMA6J28A-E3/5A in reverse bias beyond VWM risks permanent breakdown.
SMA6J28A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 51.6V
- Current - Peak Pulse (10/1000µs):
- 68A (8/20µs)
- Power - Peak Pulse:
- 4000W (4kW)
- 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)
SMA6J28A-E3/5A FAQ
1.How can I place an order for SMA6J28A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J28A-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 SMA6J28A-E3/5A reliable?
The price and inventory of SMA6J28A-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 SMA6J28A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMA6J28A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J28A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J28A-E3/5A?
SMA6J28A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J28A-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 SMA6J28A-E3/5A?
For technical support, including SMA6J28A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J28A-E3/5A requirements.
6.How does Aetrix verify that SMA6J28A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMA6J28A-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 SMA6J28A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMA6J28A-E3/5A?
All SMA6J28A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J28A-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 SMA6J28A-E3/5A part is unused and in its original packaging.
Return procedure for SMA6J28A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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