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Vishay General Semiconductor - Diodes Division SMA6J28A-M3/5A
- Part No.:
- SMA6J28A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J28A-M3/5A.pdf
- Description:
- TVS DIODE 28VWM 44VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,422
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Product details
Overview
SMA6J28A-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) in SMA (DO-214AC) package, with 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR), 44.0 V max clamping voltage at 13.6 A (10/1000 µs), 600 W peak pulse power rating, and 150 °C max junction temperature. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and lightning surges in industrial and telecom equipment.
For engineers reviewing the SMA6J28A-M3/5A datasheet, SMA6J28A-M3/5A pinout, SMA6J28A-M3/5A application, or SMA6J28A-M3/5A equivalent, key selection criteria include clamping performance at 13.6 A IPPM, thermal resistance (120 °C/W), unidirectional polarity, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on standard PCB pads.
Technical Context
This TVS diode operates as a voltage-clamped crowbar device triggered above its reverse breakdown threshold. Its dynamic resistance (RD = 0.704 Ω) and low clamping ratio (VC/VBR ≈ 1.32) ensure predictable overvoltage suppression during 10/1000 µs transients. The device exhibits a positive voltage temperature coefficient (αT = 9.8 × 10⁻⁴ /°C), enabling stable VBR tracking across -55 to +150 °C operating range.
Designed for surface-mount reliability, it meets J-STD-020 MSL Level 1, supports 260 °C lead-free reflow, and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. The SMA package provides mechanical robustness with UL 94 V-0 molding compound and cathode band polarity marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse working voltage before leakage exceeds 0.2 µA |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - defines precise conduction onset under DC stress |
| VC @ IPPM | 44.0 V at 13.6 A (10/1000 µs) - peak clamped voltage seen by protected circuit during surge |
| PPPM (10/1000 µs) | 600 W - surge energy handling capacity per standardized waveform |
| RθJA | 120 °C/W - thermal resistance from junction to ambient on standard 5 mm × 5 mm copper pads |
| Polarity | Unidirectional - conducts only in reverse bias; requires correct orientation relative to protected line |
| TJ max | +150 °C - maximum allowable junction temperature for reliable long-term operation |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with cathode band marking. Dimensions: 4.50 mm × 2.79 mm × 2.20 mm (L × W × H); weight 0.064 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path terminal | Connected to ground or lower-potential rail in unidirectional TVS configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected signal/power line; color band identifies this end for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction | M3 suffix confirms compliance with JEDEC JESD201 Class 2 whisker resistance and environmental regulations |
| MSL Level 1 moisture sensitivity | Enables unlimited floor life and compatibility with standard SMT reflow without baking |
| Low dynamic resistance (0.704 Ω) | Minimizes voltage overshoot during fast-rising transients and improves clamping precision |
| 150 °C junction rating | Supports operation in high-temperature industrial enclosures and near power components |
| UL 94 V-0 flammability rating | Ensures flame-retardant behavior under fault conditions in safety-critical systems |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of gate drivers and IGBTs against turn-off voltage spikes from inductive motor windings. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus or gate-source terminals to clamp transient overvoltages below MOSFET/IGBT breakdown limits. Use Value: Limits VC to 44.0 V at 13.6 A, preventing destructive avalanche in power semiconductors during 10/1000 µs switching events. | Use Scenario: Input-stage surge protection on AC/DC rectifier outputs and DC distribution rails in base station power modules. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing lightning-induced surges (IEC 61000-4-5) before they reach downstream regulators and controllers. Use Value: Withstands 600 W (10/1000 µs) and 4000 W (8/20 µs) pulses while maintaining VWM = 28 V to avoid false triggering during normal operation. |
| Automotive Body Control Modules | Industrial Sensor Interfaces |
Use Scenario: CAN bus line protection and load-dump suppression in 24 V vehicle subsystems. IC Role / Device Role / Timing Role: Unidirectional TVS connected between CAN_H/CAN_L and chassis ground to shunt ESD and load-dump energy. Use Value: Clamps transients within 1 ns response time and sustains 50 A IFSM for 8.3 ms half-sine surges without degradation. | Use Scenario: Signal line protection for analog sensors (e.g., pressure, temperature) interfacing with microcontrollers in factory automation. IC Role / Device Role / Timing Role: Low-leakage (0.2 µA at VWM) TVS placed on sensor output traces to suppress ESD and cable discharge events. Use Value: Maintains <0.2 µA reverse leakage at 28 V, avoiding signal offset errors in high-impedance sensor circuits while delivering 44.0 V clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J28A-E3/5A | RoHS-compliant but not halogen-free; uses standard SnPb-compatible plating instead of M3's halogen-free matte tin | Preferred where halogen-free requirement is absent and cost optimization is prioritized | Select E3 when JESD201 Class 2 whisker resistance is not mandated and legacy assembly processes apply |
| SMCJ28A-M3 | Same VWM/VBR/VC specs but in larger SMC (DO-214AB) package with higher PPPM (1500 W) and lower RθJA (60 °C/W) | Better suited for high-power or thermally constrained designs requiring >600 W surge handling | Choose SMCJ28A-M3 when board space allows and thermal derating margin must exceed SMA6J28A-M3/5A's 120 °C/W limit |
Compared with SMA6J28A-E3/5A, the M3 version adds halogen-free compliance and whisker resistance; compared with SMCJ28A-M3, it trades 600 W surge capacity and 120 °C/W thermal resistance for smaller footprint and lower profile-critical for space-constrained consumer and telecom PCBs.
Availability
SMA6J28A-M3/5A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply, halogen-free compliance, and automated SMT placement capability.
Supply support for SMA6J28A-M3/5A 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 devices, and optoelectronics with emphasis on reliability, power efficiency, and application-specific performance.
The SMA6JxxA family is engineered for robust transient suppression in compact surface-mount designs, targeting cost-sensitive yet mission-critical protection needs across industrial, telecom, and automotive sectors.
FAQ
What is the maximum clamping voltage of the SMA6J28A-M3/5A under a 10/1000 µs surge?
The SMA6J28A-M3/5A has a maximum clamping voltage (VC) of 44.0 V when subjected to a 10/1000 µs transient at 13.6 A peak pulse current. This value is measured per the test conditions specified in the Vishay datasheet (Document Number: 89460), using standard PCB mounting with 5.0 mm × 5.0 mm copper pads per terminal. The SMA6J28A-M3/5A maintains this clamping performance across its rated temperature range.
Does the SMA6J28A-M3/5A support lead-free reflow soldering?
Yes, the SMA6J28A-M3/5A is qualified for lead-free reflow soldering with a maximum peak temperature of 260 °C, meeting J-STD-020 MSL Level 1 requirements. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, and the M3 suffix confirms halogen-free construction and JESD201 Class 2 whisker resistance-making the SMA6J28A-M3/5A suitable for modern high-reliability SMT assembly lines.
How does the breakdown voltage tolerance of the SMA6J28A-M3/5A affect circuit design?
The SMA6J28A-M3/5A has a specified VBR range of 31.1 V to 34.4 V at 1 mA test current, resulting in ±5.3% tolerance. Designers must ensure that the protected circuit's maximum operating voltage remains below the minimum VBR (31.1 V) to prevent premature conduction, while verifying that the clamping voltage (44.0 V) stays below the withstand rating of downstream components. This tolerance is inherent to the SMA6J28A-M3/5A's silicon process and is documented in Vishay's Electrical Characteristics table.
Can the SMA6J28A-M3/5A be used in bidirectional configurations?
No, the SMA6J28A-M3/5A is unidirectional only, as explicitly stated in the Vishay datasheet under FEATURES. It conducts current only when reverse-biased beyond its breakdown voltage and must be oriented with the cathode band toward the protected line. For bidirectional protection, two SMA6J28A-M3/5A devices would need back-to-back connection, but Vishay does not characterize or guarantee such use-designers should select purpose-built bidirectional TVS devices like the SMBJ28A series instead of repurposing the SMA6J28A-M3/5A.
What is the thermal resistance of the SMA6J28A-M3/5A, and how does it impact power derating?
The SMA6J28A-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 5.0 mm × 5.0 mm copper pads per terminal. At ambient temperatures above 25 °C, its power dissipation must be linearly derated: PD drops from 4.0 W at TA = 50 °C to zero at TJ = 150 °C. This RθJA value directly determines safe operating area margins in thermally dense layouts and is critical when sizing copper pour areas for the SMA6J28A-M3/5A in high-reliability applications.
SMA6J28A-M3/5A 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:
- 44V
- Current - Peak Pulse (10/1000µs):
- 13.6A
- Power - Peak Pulse:
- 600W
- 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-M3/5A FAQ
1.How can I place an order for SMA6J28A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J28A-M3/5A 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-M3/5A reliable?
The price and inventory of SMA6J28A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J28A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMA6J28A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J28A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J28A-M3/5A?
SMA6J28A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J28A-M3/5A 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-M3/5A?
For technical support, including SMA6J28A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J28A-M3/5A requirements.
6.How does Aetrix verify that SMA6J28A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMA6J28A-M3/5A 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-M3/5A meets industry standards.
7.What is the process for return or replacement of SMA6J28A-M3/5A?
All SMA6J28A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J28A-M3/5A, 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-M3/5A part is unused and in its original packaging.
Return procedure for SMA6J28A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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