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Vishay General Semiconductor - Diodes Division SMA5J28AHM3/H
- Part No.:
- SMA5J28AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J28AHM3/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,184
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Product details
Overview
SMA5J28AHM3/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 rails.
For engineers reviewing the SMA5J28AHM3/H datasheet, SMA5J28AHM3/H pinout, SMA5J28AHM3/H application, or SMA5J28AHM3/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds VBR, limiting transient overvoltage to ≤45.4 V at 11.0 A. Its glass-passivated junction ensures stable leakage (<1.0 µA at 28 V) and fast response time (<1.0 ns), critical for protecting sensitive downstream circuitry from ESD and inductive switching spikes.
Thermal performance is defined by RθJA = 80 °C/W (typ.) and RθJL = 25 °C/W (typ.), enabling reliable operation up to 150 °C junction temperature. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - required for automotive-grade power rail protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping begins; sets safe margin below system supply rails. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - precise breakdown threshold ensuring predictable turn-on during transients. |
| VC @ IPPM | 45.4 V at 11.0 A - clamped voltage level that determines maximum stress on protected ICs or MOSFETs. |
| PPPM | 500 W - peak pulse power handling capability with 10/1000 µs waveform; defines surge energy absorption capacity. |
| IFSM | 40 A - non-repetitive forward surge current rating; supports robustness against accidental forward polarity surges. |
| TJ max | +150 °C - maximum junction temperature enabling use in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - surface-mount package with 5.0 mm × 5.0 mm thermal pad footprint, optimized for automated assembly and heat dissipation. |
Pinout & Package
SMA (DO-214AC) package: molded plastic case with matte tin-plated leads, cathode band marking on one end, MSL Level 1 (260 °C reflow peak), UL 94 V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side connection | Connected to ground or low-voltage reference; forms return path during clamping. |
| Cathode | Reverse voltage sensing / high-side connection | Connected to protected line (e.g., 24 V rail); avalanche conduction occurs between cathode and anode when VRM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMA package | Enables compact PCB layout and compatibility with standard SMT pick-and-place equipment without height interference. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage current across temperature and lifetime, critical for automotive reliability. |
| AEC-Q101 qualified (HM3) | Validated for automotive power electronics applications including engine control units, body controllers, and ADAS power supplies. |
| Halogen-free & RoHS-compliant | Meets global environmental regulations and eliminates corrosive halogen emissions during board rework or end-of-life processing. |
| MSL Level 1 rating | Supports single-reflow assembly without moisture sensitivity concerns, eliminating bake requirements prior to soldering. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs in engine control modules (ECMs) from load-dump transients and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC-DC converter input. Use Value: Limits voltage to ≤45.4 V during 500 W surges, preventing damage to downstream PMICs and microcontrollers. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors from ESD and cable-induced transients. IC Role / Device Role / Timing Role: TVS diode connected between signal line and ground, with low capacitance minimizing signal distortion. Use Value: Sub-1 ns response time and <1.0 µA leakage at 28 V preserve signal integrity while blocking ±15 kV contact ESD per IEC 61000-4-2. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Safeguarding -48 V telecom rectifier outputs against lightning-induced surges on outdoor cabinet power feeds. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at power entry point, oriented to clamp negative-going transients. Use Value: 500 W peak power rating handles multi-kA surge currents without degradation, meeting Telcordia GR-1089-CORE requirements. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in washing machine control boards during commutation. IC Role / Device Role / Timing Role: TVS placed across motor terminals or H-bridge FET drains to absorb stored inductive energy. Use Value: 40 A IFSM rating withstands repeated motor stall events; 150 °C TJ max supports sealed enclosure thermal environments. |
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/H | Same electrical specs, but RoHS-compliant commercial grade (E3) without halogen-free certification; no AEC-Q101 qualification. | Approved for industrial/commercial designs where automotive qualification is not mandated. | Select SMA5J28AHE3/H for cost-sensitive non-automotive applications requiring identical clamping performance. |
| SMA6J28A-M3/H | 600 W PPPM rating (vs. 500 W), same VWM/VC, larger SMA package variant (DO-214AC with enhanced thermal pad). | Higher surge margin for systems exposed to repetitive or higher-energy transients (e.g., heavy-duty industrial motor drives). | Choose SMA6J28A-M3/H when design requires >500 W surge headroom or extended thermal cycling endurance. |
Compared with SMA5J28AHM3/H, SMA5J28AHE3/H offers identical protection performance without halogen-free or AEC-Q101 assurance, while SMA6J28A-M3/H provides +20 % peak power headroom and improved thermal robustness - both require verification of PCB pad layout compatibility.
Availability
SMA5J28AHM3/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMA5J28AHM3/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 is engineered for high-power-density transient suppression in space-constrained automotive and industrial systems, delivering robust 500 W surge handling in the industry-standard SMA footprint.
FAQ
What is the clamping voltage of the SMA5J28AHM3/H and how does it protect downstream components?
The SMA5J28AHM3/H has a maximum clamping voltage (VC) of 45.4 V at 11.0 A peak pulse current (10/1000 µs waveform). This means that during a transient event, the device limits the voltage seen by downstream components - such as microcontrollers or MOSFETs - to no more than 45.4 V, preventing overvoltage damage while safely diverting surge current to ground. Its low incremental surge resistance ensures minimal voltage overshoot beyond VC.
Is the SMA5J28AHM3/H suitable for automotive applications?
Yes, the SMA5J28AHM3/H is AEC-Q101 qualified and carries the HM3 suffix, indicating halogen-free, RoHS-compliant construction validated for automotive use. It meets stringent reliability requirements for under-hood and chassis-mounted electronics, including operation up to +150 °C junction temperature and resistance to thermal cycling, humidity, and mechanical shock - making it appropriate for engine control units, body electronics, and ADAS power supplies.
How does the SMA5J28AHM3/H differ from the SMA5J28A-E3/H variant?
The SMA5J28AHM3/H differs from SMA5J28A-E3/H primarily in material composition and qualification: HM3 denotes halogen-free and AEC-Q101 qualified construction, whereas E3 is RoHS-compliant but not halogen-free nor automotive-qualified. Electrically, both share identical VWM (28 V), VBR, VC, and PPPM ratings. The HM3 version is mandatory for automotive Tier 1 suppliers, while E3 suffices for commercial/industrial use.
What is the recommended PCB layout for optimal thermal and electrical performance of the SMA5J28AHM3/H?
Vishay specifies mounting the SMA5J28AHM3/H on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 500 W pulse power and thermal resistance (RθJA = 80 °C/W). Use minimum 2 oz copper, thermal vias under pads if possible, and avoid narrow traces. The cathode band must align with schematic polarity; incorrect orientation disables clamping function. Pad dimensions match DO-214AC outline - verify against Vishay's package drawing 88875, page 4.
Does the SMA5J28AHM3/H have bidirectional capability?
No, the SMA5J28AHM3/H is a unidirectional TVS diode, indicated by the "A" (not "CA") suffix in its part number. It conducts only in reverse bias (cathode-to-anode) during overvoltage events and blocks forward current up to 40 A IFSM. For bidirectional protection - e.g., AC lines or data buses - a CA-suffixed variant like SMA5J28CAHM3/H would be required, which clamps symmetrically in both polarities.
SMA5J28AHM3/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:
- Discontinued at Digi-Key
- 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/H FAQ
1.How can I place an order for SMA5J28AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J28AHM3/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/H reliable?
The price and inventory of SMA5J28AHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMA5J28AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J28AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J28AHM3/H?
SMA5J28AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J28AHM3/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/H?
For technical support, including SMA5J28AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J28AHM3/H requirements.
6.How does Aetrix verify that SMA5J28AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMA5J28AHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMA5J28AHM3/H?
All SMA5J28AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J28AHM3/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/H part is unused and in its original packaging.
Return procedure for SMA5J28AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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