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Vishay General Semiconductor - Diodes Division SMA6J28AHM3/5A
- Part No.:
- SMA6J28AHM3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J28AHM3/5A.pdf
- Description:
- TVS DIODE 28VWM 44VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,992
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Product details
Overview
SMA6J28AHM3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients up to 44.0 V at 13.6 A (10/1000 µs), with 600 W peak pulse power rating and 28 V stand-off voltage. It protects MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment against inductive switching surges.
For engineers reviewing the SMA6J28AHM3/5A datasheet, SMA6J28AHM3/5A pinout, SMA6J28AHM3/5A application, or SMA6J28AHM3/5A equivalent, key selection criteria include clamping voltage (VC = 44.0 V @ IPP = 13.6 A), breakdown voltage range (31.1–34.4 V), unidirectional polarity, SMA package thermal resistance (RθJA = 120 °C/W), and halogen-free RoHS compliance (M3 suffix).
Technical Context
This TVS diode operates as a fast-acting shunt protector triggered by reverse-biased avalanche breakdown above its 31.1–34.4 V breakdown voltage (VBR), clamping transient energy within 1 ns response time. Its dynamic resistance (RD = 0.704 Ω) ensures predictable voltage rise under surge current, enabling precise overvoltage protection design.
Rated for -55 °C to +150 °C junction temperature, it delivers 600 W peak pulse power (10/1000 µs) and 4000 W (8/20 µs), with 4 W steady-state power dissipation at TA = 50 °C and 50 A non-repetitive forward surge capability - supporting robust protection in high-energy transient environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 28 V - maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| Breakdown Voltage (VBR) | 31.1–34.4 V @ IT = 1 mA - guaranteed avalanche initiation range; sets minimum overvoltage trip point |
| Clamping Voltage (VC) | 44.0 V @ IPP = 13.6 A (10/1000 µs) - maximum voltage seen by protected circuit during rated surge |
| Peak Pulse Power (PPPM) | 600 W (10/1000 µs) - surge energy handling capacity for standard lightning/surge waveforms |
| Leakage Current (ID) | 0.2 µA @ VWM - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss |
| Junction Temperature Range | -55 °C to +150 °C - enables deployment in harsh industrial and automotive under-hood environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal requirement |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 flammability rating, cathode indicated by color band. Mounting requires 5.0 mm × 5.0 mm copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance reference; completes clamping loop during reverse surge |
| Cathode | Avalanche conduction node / protected line connection | Connected to I/O line or power rail being protected; carries full surge current during clamping event |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional polarity | Enables DC-biased line protection without forward conduction interference; eliminates need for series blocking components |
| MSL Level 1 (J-STD-020) | Supports lead-free reflow up to 260 °C peak without moisture-induced damage; compatible with standard SMT assembly |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance requirements for industrial and telecom end-equipment without compromising surge performance |
| Low dynamic resistance (RD = 0.704 Ω) | Minimizes voltage overshoot during fast-rising transients; improves clamping precision across surge current range |
| 150 °C max junction temperature | Allows operation in high-ambient environments such as motor drives and base station power supplies without derating |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensing circuits against inductive kickback from IGBT/MOSFET switching in variable-frequency drives. IC Role / Device Role / Timing Role: Shunt clamping device placed between gate-source or supply-rail and ground to limit transient voltage to safe levels. Use Value: Prevents gate oxide rupture and false triggering by clamping spikes to ≤44.0 V while sustaining 13.6 A surge current per IEC 61000-4-5. |
Use Scenario: Input-stage surge suppression on 24–48 V DC power inputs of cellular base station power modules exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary transient suppressor on bulk input rail, coordinated with upstream MOVs and downstream LC filters. Use Value: Absorbs 600 W (10/1000 µs) energy without degradation, maintaining system uptime and meeting GR-1089-CORE immunity requirements. |
| Automotive Body Control Modules | Industrial Sensor Interfaces |
Use Scenario: Protection of LIN bus transceivers and microcontroller I/O pins against load dump and ISO 7637-2 pulse 5a transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Unidirectional TVS placed directly at connector interface to clamp reverse-polarity and surge events. Use Value: Withstands 50 A peak forward surge and maintains <0.2 µA leakage at 28 V, ensuring signal fidelity and low quiescent current compliance. |
Use Scenario: ESD and surge protection for analog output lines (e.g., 4–20 mA loops) and digital sensor interfaces (I²C, SPI) in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) shunt protector on signal traces adjacent to connectors or long cables. Use Value: Clamps transients to 44.0 V within nanoseconds while adding negligible loading (<0.2 µA leakage), preserving measurement accuracy and communication integrity. |
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; RoHS-compliant with lead-free plating (E3), not halogen-free | Preferred where halogen-free material is not mandated but lead-free assembly is required | Select SMA6J28AHE3/5A for cost-sensitive industrial designs without halogen restrictions |
| SMCJ28A-M3/57T | Higher 1500 W PPPM (10/1000 µs); larger SMC (DO-214AB) package; RθJA = 35 °C/W | Better thermal performance and surge margin; requires larger PCB footprint and layout revision | Choose SMCJ28A-M3/57T when >600 W surge rating or lower thermal resistance is mandatory |
Compared with SMA6J28AHM3/5A, SMA6J28AHE3/5A offers identical protection performance with different environmental compliance, while SMCJ28A-M3/57T provides higher surge capacity at the cost of larger size and revised layout - making SMA6J28AHM3/5A optimal for space-constrained, halogen-free industrial and telecom designs requiring 600 W clamping.
Availability
SMA6J28AHM3/5A 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 reliable 600 W transient suppression.
Supply support for SMA6J28AHM3/5A 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 and application-specific performance.
The SMA6J28AHM3/5A belongs to Vishay's TRANSZORB® family of surface-mount TVS diodes, engineered specifically for high-energy transient suppression in space-constrained industrial, telecom, and automotive systems.
FAQ
What is the clamping voltage of the SMA6J28AHM3/5A under a 10/1000 µs surge?
The SMA6J28AHM3/5A has a maximum clamping voltage (VC) of 44.0 V when subjected to a 13.6 A peak pulse current with a 10/1000 µs waveform. This value is measured per the test conditions specified in the Vishay datasheet document 89460 and reflects the actual voltage imposed on the protected circuit during standardized surge events. The SMA6J28AHM3/5A maintains this clamping performance across its qualified temperature range.
Does the SMA6J28AHM3/5A support lead-free reflow soldering?
Yes, the SMA6J28AHM3/5A meets J-STD-020 MSL Level 1 and supports lead-free reflow soldering with a maximum peak temperature of 260 °C. Its matte tin-plated leads are solderable per J-STD-002 and JESD 22-B102, and the M3 suffix confirms halogen-free, RoHS-compliant construction - making SMA6J28AHM3/5A suitable for modern automated SMT lines without moisture sensitivity concerns.
What is the difference between SMA6J28AHM3/5A and SMA6J28AHE3/5A?
The SMA6J28AHM3/5A and SMA6J28AHE3/5A share identical electrical specifications including VWM = 28 V, VBR = 31.1–34.4 V, and VC = 44.0 V, but differ in environmental compliance: the M3 suffix denotes halogen-free and RoHS-compliant construction, while E3 indicates RoHS-compliant with lead-free plating but not halogen-free. Both use the same SMA (DO-214AC) package and 13" tape-and-reel delivery (5A).
Can the SMA6J28AHM3/5A be used in bidirectional protection circuits?
No, the SMA6J28AHM3/5A is a unidirectional TVS diode and is not suitable for bidirectional protection. Its design supports only reverse-biased avalanche clamping; forward conduction occurs above ~3.5 V (VF = 3.5 V @ IF = 25 A), making it inappropriate for AC or dual-polarity signal lines. For bidirectional applications, a dedicated bidirectional TVS such as SMBJ28A or a back-to-back diode configuration must be used instead of SMA6J28AHM3/5A.
What is the thermal resistance of the SMA6J28AHM3/5A, and how does it affect PCB layout?
The SMA6J28AHM3/5A 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. This value directly impacts PCB layout: undersized pads increase thermal impedance, causing excessive junction temperature rise during repeated surges. To achieve rated 4 W power dissipation at TA = 50 °C, designers must implement the specified pad dimensions and avoid thermal isolation - otherwise, derating is required for SMA6J28AHM3/5A reliability.
SMA6J28AHM3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA6J28AHM3/5A FAQ
1.How can I place an order for SMA6J28AHM3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J28AHM3/5A 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 SMA6J28AHM3/5A reliable?
The price and inventory of SMA6J28AHM3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J28AHM3/5A is usually 5 days.
3.What payment methods are accepted for SMA6J28AHM3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J28AHM3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J28AHM3/5A?
SMA6J28AHM3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J28AHM3/5A 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 SMA6J28AHM3/5A?
For technical support, including SMA6J28AHM3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J28AHM3/5A requirements.
6.How does Aetrix verify that SMA6J28AHM3/5A is sourced from the original manufacturer or authorized distributors?
All SMA6J28AHM3/5A 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 SMA6J28AHM3/5A meets industry standards.
7.What is the process for return or replacement of SMA6J28AHM3/5A?
All SMA6J28AHM3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J28AHM3/5A, 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 SMA6J28AHM3/5A part is unused and in its original packaging.
Return procedure for SMA6J28AHM3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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