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Vishay General Semiconductor - Diodes Division SMA5J28AHE3_A/H
- Part No.:
- SMA5J28AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J28AHE3_A/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA5J28AHE3_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 with 28 V standoff voltage (VWM), 31.1–34.4 V breakdown (VBR), 45.4 V clamping at 11.0 A peak pulse current (IPPM), and 500 W peak pulse power (10/1000 µs). It protects MOSFETs, ICs, and sensor signal lines in automotive powertrain control units.
For engineers reviewing the SMA5J28AHE3_A/H datasheet, SMA5J28AHE3_A/H pinout, SMA5J28AHE3_A/H application, or SMA5J28AHE3_A/H equivalent, key selection criteria include clamping voltage margin vs. protected device VDS/VCC, AEC-Q101 qualification status, thermal resistance (RθJA = 80 °C/W), and unidirectional polarity marking for correct PCB orientation.
Technical Context
This TVS operates as a voltage-clamped shunt protector triggered by reverse-biased avalanche breakdown. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response (<1 ns), while low incremental surge resistance enables effective energy diversion during 8.3 ms half-sine surges up to 40 A (IFSM).
Designed for surface-mount automated assembly on 5.0 mm × 5.0 mm copper pads, it meets MSL level 1 (260 °C reflow peak) and supports automotive-grade reliability via AEC-Q101 qualification-confirmed by HE3 suffix and "_A/H" revision code denoting RoHS-compliant, AEC-Q101 qualified variant in 7" tape-and-reel packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit for protected circuit's normal operating range. |
| VBR (min/max) | 31.1 V / 34.4 V - Breakdown voltage range at 1 mA test current; defines threshold where clamping initiates under transient stress. |
| VC @ IPPM | 45.4 V - Clamping voltage at 11.0 A peak pulse current (10/1000 µs); determines maximum voltage seen by downstream components during surge. |
| PPPM | 500 W - Peak pulse power rating (10/1000 µs waveform); quantifies single-event surge energy handling capability. |
| IFSM | 40 A - Non-repetitive forward surge current (8.3 ms half-sine); critical for inductive load switching protection in automotive power stages. |
| TJ max. | +150 °C - Maximum junction temperature; constrains thermal design when mounted on minimum pad layout per datasheet fig. 2 derating curve. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, unidirectional polarity marked by cathode band. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H), with 2.54 mm lead pitch and matte tin-plated terminals solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to ground or low-side return path; must be routed with low-inductance trace to minimize clamping overshoot. |
| Cathode (banded end) | Avalanche conduction terminal | Connected to protected line (e.g., 28 V rail or sensor input); band orientation confirms correct placement during automated assembly. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable reverse leakage (<1.0 µA at VWM) across -55 °C to +150 °C, critical for long-term reliability in engine bay environments. |
| AEC-Q101 qualification (HE3 suffix) | Validated for automotive applications including powertrain and body electronics, with full stress testing per JESD22-A108 and A114. |
| Low RθJA (80 °C/W) | Enables effective heat dissipation on standard 5.0 mm × 5.0 mm copper pads, supporting sustained surge duty cycles without thermal runaway. |
| MSL Level 1 compliance | Permits single-reflow assembly at 260 °C peak without popcorn cracking or delamination, eliminating pre-bake requirements in SMT lines. |
Applications
| Automotive Powertrain Control | Industrial Sensor Signal Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (ISO 7637-2 Pulse 5a) on 28 V battery-fed ECU power rails. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between 28 V supply and chassis ground, clamping spikes within 1 ns to protect MCU power pins and gate drivers. Use Value: Limits peak voltage to 45.4 V during 500 W surges, maintaining safe margin below 50 V-rated DC-DC converter inputs. | Use Scenario: Protecting analog output lines of pressure sensors in hydraulic control systems exposed to relay coil flyback. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF at VWM) TVS placed at sensor connector interface, shunting 10/1000 µs transients before reaching ADC front-end. Use Value: Prevents latch-up in 12-bit SAR ADCs by clamping induced voltages to ≤45.4 V while adding <0.5 pF parasitic capacitance. |
| Telecom Line Interface | Consumer Appliance Motor Drive |
Use Scenario: Safeguarding RS-485 transceivers connected to outdoor cabling subject to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS installed on VCC line and data lines (with series impedance), leveraging fast response to clamp ESD and surge events before transceiver damage. Use Value: Meets IEC 61000-4-5 Level 3 (1 kV/2 Ω) with 45.4 V clamping, preserving signal integrity on 3.3 V or 5 V logic interfaces. | Use Scenario: Mitigating commutation spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, power tools). IC Role / Device Role / Timing Role: Mounted across motor terminals or H-bridge supply rails, absorbing inductive kickback energy during PWM switching transitions. Use Value: Handles 40 A single-half-sine surges (8.3 ms), preventing MOSFET avalanche failure and reducing electromagnetic emissions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J28A-M3/61 | Halogen-free, RoHS-compliant, commercial grade (no AEC-Q101 qualification); identical electrical specs and SMA package. | Not validated for automotive underhood use; suitable for industrial/commercial equipment with lower reliability requirements. | Select when AEC-Q101 is not mandated and halogen-free compliance is prioritized over automotive qualification. |
| SMC5J28AHE3_A/H | Same electrical specs but in larger SMC (DO-214AB) package; higher thermal mass (RθJA = 50 °C/W) and 600 W PPPM. | Better suited for high-duty-cycle surges or elevated ambient temperatures (>105 °C); requires larger PCB footprint (7.11 mm × 6.22 mm). | Choose when thermal performance exceeds SMA5J28AHE3_A/H limits or when legacy SMC footprints exist. |
Compared with SMA5J28AHE3_A/H, SMA5J28A-M3/61 offers identical surge protection without automotive qualification, while SMC5J28AHE3_A/H delivers higher power handling and thermal robustness at the cost of board space-enabling trade-offs between qualification, footprint, and thermal margin.
Availability
SMA5J28AHE3_A/H is available at Aetrix Electronics and suitable for automotive powertrain control, industrial sensor signal protection, and telecom line interface applications requiring stable component supply and AEC-Q101 assurance.
Supply support for SMA5J28AHE3_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, and protection devices with emphasis on reliability, efficiency, and automotive-grade validation.
The SMA5J series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density transient suppression in harsh environments-including engine compartments, industrial motor drives, and telecom infrastructure-where fast response, low clamping, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of the SMA5J28AHE3_A/H at its rated peak pulse current?
The SMA5J28AHE3_A/H has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 11.0 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and ensures protected circuits remain below critical voltage thresholds during surge events. The SMA5J28AHE3_A/H maintains this clamping performance across its specified operating temperature range (-55 °C to +150 °C).
Is the SMA5J28AHE3_A/H qualified for automotive applications?
Yes, the SMA5J28AHE3_A/H is AEC-Q101 qualified, as confirmed by its HE3 suffix and "_A/H" revision code indicating RoHS-compliant, automotive-grade construction. It undergoes full stress testing per JESD22-A108 (temperature cycling), JESD22-A114 (mechanical shock), and JESD22-A104 (highly accelerated stress test), making it suitable for powertrain, body control, and ADAS modules where reliability under thermal and vibration stress is critical.
What does the "HE3" suffix indicate in SMA5J28AHE3_A/H?
The "HE3" suffix in SMA5J28AHE3_A/H denotes a RoHS-compliant, AEC-Q101 qualified version with matte tin-plated leads meeting J-STD-002 solderability and JESD201 Class 2 whisker resistance. The "_A/H" portion specifies revision A in 7" diameter plastic tape-and-reel packaging (1800 units per reel), distinguishing it from commercial (E3) or halogen-free (HM3) variants.
How does the SMA5J28AHE3_A/H compare to bidirectional TVS diodes like SMA5J28CA?
The SMA5J28AHE3_A/H is unidirectional and features polarity marking (cathode band), enabling asymmetric protection on DC rails where reverse conduction must be blocked. In contrast, SMA5J28CA is bidirectional with no polarity marking and symmetric clamping in both directions-suitable for AC lines or differential data buses. Electrical parameters differ: SMA5J28CA has higher VBR (min 34.2 V) and lower IPPM (9.1 A), reflecting its dual-path conduction architecture.
What is the thermal resistance of the SMA5J28AHE3_A/H, and how does it affect PCB layout?
The SMA5J28AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain junction temperature below 150 °C during repetitive surges, designers must allocate sufficient copper area and avoid thermal bottlenecks-such as narrow traces or insufficient vias-between the SMA pads and internal ground planes. Derating curves in Figure 2 of the datasheet guide power handling at elevated ambient temperatures.
SMA5J28AHE3_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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J28AHE3_A/H FAQ
1.How can I place an order for SMA5J28AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J28AHE3_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 SMA5J28AHE3_A/H reliable?
The price and inventory of SMA5J28AHE3_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 SMA5J28AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMA5J28AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J28AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J28AHE3_A/H?
SMA5J28AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J28AHE3_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 SMA5J28AHE3_A/H?
For technical support, including SMA5J28AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J28AHE3_A/H requirements.
6.How does Aetrix verify that SMA5J28AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMA5J28AHE3_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 SMA5J28AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMA5J28AHE3_A/H?
All SMA5J28AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J28AHE3_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 SMA5J28AHE3_A/H part is unused and in its original packaging.
Return procedure for SMA5J28AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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