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Vishay General Semiconductor - Diodes Division SMA6J28A-M3/61
- Part No.:
- SMA6J28A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J28A-M3/61.pdf
- Description:
- TVS DIODE 28VWM 44VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA6J28A-M3/61 from Vishay General Semiconductor is a unidirectional surface-mount TransZorb® transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, rated for 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR), and 600 W peak pulse power (10/1000 µs). It clamps transients to ≤44.0 V at 13.6 A IPPM and operates from –55 °C to +150 °C, protecting MOSFETs and ICs in industrial power supplies.
For engineers reviewing the SMA6J28A-M3/61 datasheet, SMA6J28A-M3/61 pinout, SMA6J28A-M3/61 application, or SMA6J28A-M3/61 equivalent, key selection criteria include clamping voltage at rated surge current, unidirectional polarity compatibility, thermal resistance (RθJA = 120 °C/W), MSL Level 1 moisture sensitivity, and halogen-free RoHS compliance per suffix M3.
Technical Context
This TVS diode functions as a fast-acting shunt protector triggered by reverse-biased avalanche breakdown above VWM. Its dynamic resistance (RD = 0.704 Ω) and low clamping ratio (VC/VBR ≈ 1.32) ensure precise overvoltage limiting during 10/1000 µs surges up to 13.6 A.
Designed for PCB-level protection of DC power rails and signal lines, it leverages the SMA package's low thermal resistance (RθJL = 25 °C/W) and matte tin-plated leads compliant with J-STD-002 solderability standards, enabling reliable reflow attachment without whisker risk (JESD 201 Class 2).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin. |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across temperature. |
| VC at IPPM | 44.0 V at 13.6 A (10/1000 µs) - Clamped voltage under standard surge; determines protected circuit's maximum stress level. |
| PPPM (10/1000 µs) | 600 W - Peak transient energy handling capacity; sized for IEC 61000-4-5 Level 3 surges on 24 V systems. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on 5.0 mm × 5.0 mm copper pads; guides PCB copper area requirements. |
| Polarity | Unidirectional - Cathode-band marked; suitable only for DC or single-polarity AC rail protection. |
| MSL Level | Level 1 per J-STD-020 - No floor life limitation; supports standard SMT reflow without dry-pack or baking. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, 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 entry / surge return path | Connected to ground or low-impedance return; completes clamping loop during transient events. |
| Cathode | Avalanche conduction terminal | Connected to protected line; reverse-biased operation enables rapid breakdown when V > VWM. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | VC = 44.0 V @ 13.6 A (10/1000 µs) - Limits voltage overshoot to <1.6× VWM, preserving downstream 30 V-rated components. |
| Thermal robustness | RθJL = 25 °C/W - Enables efficient heat transfer to PCB copper, supporting 4 W steady-state dissipation at TA = 50 °C. |
| Manufacturing readiness | MSL Level 1 + matte tin plating - Eliminates moisture sensitivity concerns and ensures solder joint reliability in automated assembly. |
| Environmental compliance | M3 suffix = halogen-free + RoHS-compliant - Meets IPC-1752A material declaration requirements for industrial end equipment. |
Applications
| Industrial PLC Power Rails | Automotive Body Control Module (BCM) Inputs |
|---|---|
Use Scenario: Protecting 24 V DC input rails in programmable logic controllers against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between rail and ground, activated within nanoseconds upon overvoltage detection. Use Value: Clamps 10/1000 µs surges to ≤44.0 V, preventing latch-up or gate oxide damage in upstream DC/DC controllers and microcontrollers. |
Use Scenario: Safeguarding sensor interface inputs (e.g., door lock actuator signals) in BCMs exposed to ISO 7637-2 Pulse 1/2a transients. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-ground, cathode-to-signal line, providing low-leakage standby protection. Use Value: Delivers <0.2 µA leakage at 28 V, ensuring minimal impact on high-impedance sensor bias networks while surviving 50 A IFSM surge events. |
| Telecom PoE Midspan Ports | Consumer Appliance Motor Drive Supplies |
Use Scenario: Secondary-side transient suppression on 48 V PoE midspan outputs feeding IEEE 802.3af/at-powered devices. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing induced lightning surges coupled onto Ethernet cabling before reaching PD interface ICs. Use Value: Withstands 4000 W (8/20 µs) peak pulse power, meeting IEC 61000-4-5 2 kV line-to-ground surge immunity requirements. |
Use Scenario: Input rail protection in washing machine motor control boards subject to relay contact bounce and brush-commutator noise. IC Role / Device Role / Timing Role: Fast-response avalanche diode placed across bulk capacitor terminals to clamp repetitive 100 ns–1 µs spikes. Use Value: Maintains stable VBR over –55 °C to +150 °C (αT = 9.8 × 10⁻⁴/°C), ensuring consistent protection across ambient and self-heating conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J28A-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free; E3 suffix instead of M3 | Acceptable where halogen-free requirement is not mandated (e.g., non-EU consumer goods) | Select E3 for cost-sensitive designs without halogen-free mandates; M3 required for IPC-1752A-compliant BOMs. |
| SMBJ28A-M3 | Higher 600 W PPPM rating retained, but SMB package (DO-214AA) offers larger pad area and lower RθJA (90 °C/W) | Better thermal performance in high-duty-cycle surge environments; requires PCB layout change | Choose SMBJ28A-M3 when board space allows and junction temperature rise must be minimized under repeated surges. |
Compared with SMA6J28A-M3/61, the E3 variant trades halogen-free status for identical protection performance, while SMBJ28A-M3 upgrades thermal capability at the cost of footprint size-neither is pin-compatible due to differing package outlines (SMA vs. SMB).
Availability
SMA6J28A-M3/61 is available at Aetrix Electronics and suitable for industrial PLC power rails, automotive BCM inputs, and telecom PoE midspan ports requiring stable component supply, halogen-free compliance, and MSL Level 1 manufacturability.
Supply support for SMA6J28A-M3/61 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, and protection devices with emphasis on reliability, thermal performance, and AEC-Q200 qualification.
The SMA6J28A-M3/61 belongs to Vishay's TransZorb® TVS family, engineered specifically for robust, low-profile DC rail protection in harsh industrial and automotive environments where repeatable clamping and long-term stability are critical.
FAQ
What is the maximum clamping voltage of the SMA6J28A-M3/61 at its rated peak pulse current?
The SMA6J28A-M3/61 exhibits a maximum clamping voltage (VC) of 44.0 V when subjected to a 10/1000 µs waveform at its rated peak pulse current of 13.6 A. This value is measured per the test conditions specified in Vishay document 89460 and reflects actual device behavior under standardized surge conditions-not a calculated or typical value. The SMA6J28A-M3/61 maintains this clamping performance across its qualified temperature range.
Does the SMA6J28A-M3/61 support bidirectional transient suppression?
No, the SMA6J28A-M3/61 is strictly unidirectional, as confirmed in the Vishay datasheet section "FEATURES" and electrical characteristics table. It contains a single PN junction oriented for reverse-bias avalanche operation only. For bidirectional protection, a separate device such as the SMBJ28CA-M3 or dual-diode array would be required. The SMA6J28A-M3/61 cathode band marking indicates polarity and must be correctly oriented in-circuit.
What is the thermal resistance from junction to ambient for the SMA6J28A-M3/61 under standard mounting conditions?
The SMA6J28A-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on PCBs using the minimum recommended 5.0 mm × 5.0 mm copper pads per terminal, per Vishay document 89460, Section "THERMAL CHARACTERISTICS". This value assumes natural convection and defines the temperature rise above ambient per watt of steady-state power dissipation-critical for derating calculations at elevated ambient temperatures.
Is the SMA6J28A-M3/61 compliant with lead-free reflow soldering standards?
Yes, the SMA6J28A-M3/61 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 solderability standards, and the M3 suffix confirms halogen-free, RoHS-compliant construction-making the SMA6J28A-M3/61 suitable for modern high-reliability SMT assembly lines.
How does the breakdown voltage tolerance of the SMA6J28A-M3/61 affect system design margins?
The SMA6J28A-M3/61 has a specified VBR range of 31.1 V to 34.4 V at 1 mA, yielding ±5.3% tolerance around the nominal 32.75 V midpoint. This variation must be accounted for in system-level overvoltage margining: the protected IC's absolute maximum rating must exceed 34.4 V to avoid conduction during normal operation, while remaining below the 44.0 V clamping voltage to ensure survivability. The SMA6J28A-M3/61 datasheet provides αT = 9.8 × 10⁻⁴/°C for temperature compensation.
SMA6J28A-M3/61 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:
- 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-M3/61 FAQ
1.How can I place an order for SMA6J28A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J28A-M3/61 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 SMA6J28A-M3/61 reliable?
The price and inventory of SMA6J28A-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J28A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMA6J28A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J28A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J28A-M3/61?
SMA6J28A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J28A-M3/61 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 SMA6J28A-M3/61?
For technical support, including SMA6J28A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J28A-M3/61 requirements.
6.How does Aetrix verify that SMA6J28A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMA6J28A-M3/61 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 SMA6J28A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMA6J28A-M3/61?
All SMA6J28A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J28A-M3/61, 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 SMA6J28A-M3/61 part is unused and in its original packaging.
Return procedure for SMA6J28A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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