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Vishay General Semiconductor - Diodes Division SMA5J28AHM3_A/H
- Part No.:
- SMA5J28AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J28AHM3_A/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,301
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Product details
Overview
SMA5J28AHM3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on power and signal 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 - used to safeguard MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMA5J28AHM3_A/H datasheet, SMA5J28AHM3_A/H pinout, SMA5J28AHM3_A/H application, or SMA5J28AHM3_A/H equivalent, key selection criteria include clamping performance under 10/1000 µs surges, AEC-Q101 qualification status, thermal resistance (RθJA = 80 °C/W), unidirectional polarity marking, and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 28 V, it avalanches at VBR ≥ 31.1 V (min) and limits transient voltage to ≤ 45.4 V at IPPM = 11.0 A. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1 ns).
Rated for TJ = –55 °C to +150 °C operation, it delivers 500 W peak pulse power dissipation with derating above 25 °C ambient, and meets MSL Level 1 (260 °C reflow peak). The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101 qualified construction for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - guaranteed avalanche initiation range; ensures consistent turn-on across temperature and unit variation. |
| VC @ IPPM | 45.4 V at 11.0 A - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 500 W - peak pulse power handling capability; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| IFSM | 40 A - non-repetitive forward surge current rating (8.3 ms half-sine); supports inrush and fault-current tolerance in DC power paths. |
| RθJA | 80 °C/W - junction-to-ambient thermal resistance; informs PCB pad layout requirements for sustained surge duty cycles. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band; polarity critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / surge return path | Connected to system ground or low-side reference; completes clamping loop during transients. |
| Cathode | Reverse-biased terminal / surge input node | Connected to protected line (e.g., 24 V rail or signal trace); avalanche conduction occurs here during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - supports under-hood and ADAS ECU deployments. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and JEDEC JESD201 Class 2 whisker resistance - suitable for high-reliability production. |
| Low incremental surge resistance | Enables tighter VC–IPPM relationship, reducing let-through energy during fast transients like ISO 7637-2 pulses. |
| MSL Level 1 (260 °C peak) | Compatible with standard SMT reflow profiles without moisture sensitivity concerns - eliminates bake requirements pre-assembly. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs of body control modules (BCMs) against load dump and jump-start surges per ISO 16750-2. IC Role / Device Role / Timing Role: Unidirectional shunt TVS diode placed between VBAT and chassis ground. Use Value: Clamps transients to ≤45.4 V while dissipating up to 500 W, preventing damage to downstream DC-DC converters and microcontrollers. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on dry-contact or 24 V sink inputs to absorb inductive kickback from solenoids and relays. Use Value: Sub-1 ns response ensures clamping before microcontroller GPIOs experience overstress, preserving long-term I/O integrity. |
| Motor Drive Gate Driver Protection | Automotive Sensor Signal Line Protection |
Use Scenario: Shielding high-side/low-side gate drivers in BLDC inverters from Miller-induced voltage spikes during switching. IC Role / Device Role / Timing Role: Localized TVS across driver output and ground to suppress dV/dt coupling into gate nodes. Use Value: Low Rsurge and 45.4 V clamping limit gate-source voltage excursion, avoiding unintended FET turn-on or oxide stress. |
Use Scenario: Protecting LIN or analog sensor outputs (e.g., pressure, temperature) in engine compartments from ESD and alternator noise. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; this unidirectional part used on supply-referenced signal lines with defined polarity. Use Value: 1.0 µA max leakage at 28 V ensures minimal impact on sensor bias networks and ADC accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J28AHE3_A/H | Same electrical specs, but E3 suffix: RoHS-compliant commercial grade without halogen-free certification or AEC-Q101 qualification. | Approved for non-automotive industrial or consumer use only; not validated for automotive temperature cycling or humidity testing. | Select SMA5J28AHE3_A/H only if halogen-free content and AEC-Q101 are not required; otherwise SMA5J28AHM3_A/H is preferred for automotive OEM designs. |
| SMA6J28A-Q | 600 W PPPM, same VWM/VC, AEC-Q101 qualified, but larger SMA (DO-214AC) variant with higher IPPM (12.3 A) and lower RθJA (70 °C/W). | Supports higher surge repetition rates and longer pulse durations due to enhanced thermal mass and power rating. | Choose SMA6J28A-Q where multi-pulse surge immunity or extended thermal margin is needed; SMA5J28AHM3_A/H remains optimal for space-constrained 500 W duty cycles. |
Compared with SMA5J28AHE3_A/H, the SMA5J28AHM3_A/H adds halogen-free materials and AEC-Q101 validation without sacrificing electrical performance; versus SMA6J28A-Q, it trades 100 W peak power and thermal margin for identical footprint and lower cost in single-event surge applications.
Availability
SMA5J28AHM3_A/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input hardening, and motor drive gate driver safeguarding requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMA5J28AHM3_A/H 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 SMA5J series was engineered for high-power-density transient suppression in space-constrained automotive and industrial environments, balancing clamping precision, surge robustness, and manufacturability in standard SMT packages.
FAQ
What is the clamping voltage of the SMA5J28AHM3_A/H under a 10/1000 µs surge?
The SMA5J28AHM3_A/H has a maximum clamping voltage (VC) of 45.4 V at 11.0 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and reflects the actual voltage seen by protected circuitry during standardized surge events. The SMA5J28AHM3_A/H maintains this clamping performance across its rated junction temperature range (–55 °C to +150 °C), with minor derating above 25 °C ambient.
Is the SMA5J28AHM3_A/H qualified for automotive applications?
Yes, the SMA5J28AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88875 (Revision 09-Jan-2024). This qualification covers stress tests including temperature cycling, humidity bias HAST, and mechanical shock - validating its suitability for under-hood and chassis-mounted automotive ECUs. The SMA5J28AHM3_A/H also meets MSL Level 1 and JESD201 Class 2 whisker resistance requirements.
What does the "HM3" suffix mean in SMA5J28AHM3_A/H?
The "HM3" suffix in SMA5J28AHM3_A/H indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. "H" denotes the packaging configuration (7" tape and reel), "M3" specifies halogen-free molding compound and lead finish, and "_A/H" identifies the revision and reel size. This distinguishes it from E3 (RoHS commercial) and HE3 (AEC-Q101 + RoHS) variants - all sharing identical electrical specs but differing in material compliance and qualification scope.
How does the SMA5J28AHM3_A/H compare to bidirectional TVS diodes?
The SMA5J28AHM3_A/H is unidirectional and features a cathode band for polarity-sensitive placement - it conducts only during reverse overvoltage, making it ideal for DC power rails with defined ground reference. Unlike bidirectional types (e.g., SMA5J28CA), it does not suppress surges on AC-coupled or floating signal lines. Its forward voltage drop (3.5 V at 25 A) is specified, whereas bidirectional parts lack forward conduction behavior.
What is the thermal resistance of the SMA5J28AHM3_A/H, and how does it affect layout?
The SMA5J28AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 0.2" x 0.2" (5.0 mm x 5.0 mm) copper pads per terminal. This value guides PCB layout: to sustain repeated surges, designers must provide adequate copper area and thermal vias to minimize junction temperature rise. Exceeding 150 °C TJ risks parametric shift or failure, so thermal design must align with expected surge frequency and duration.
SMA5J28AHM3_A/H 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:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 11A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J28AHM3_A/H FAQ
1.How can I place an order for SMA5J28AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J28AHM3_A/H 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 SMA5J28AHM3_A/H reliable?
The price and inventory of SMA5J28AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J28AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMA5J28AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J28AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J28AHM3_A/H?
SMA5J28AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J28AHM3_A/H 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 SMA5J28AHM3_A/H?
For technical support, including SMA5J28AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J28AHM3_A/H requirements.
6.How does Aetrix verify that SMA5J28AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMA5J28AHM3_A/H 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 SMA5J28AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMA5J28AHM3_A/H?
All SMA5J28AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J28AHM3_A/H, 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 SMA5J28AHM3_A/H part is unused and in its original packaging.
Return procedure for SMA5J28AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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