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Vishay General Semiconductor - Diodes Division SMA5J28CAHM3/I
- Part No.:
- SMA5J28CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J28CAHM3/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,054
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Product details
Overview
SMA5J28CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on signal and power lines. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 500 W peak pulse power (10/1000 μs), clamping voltage of 45.4 V at 11.0 A IPPM, and operates from –55 °C to +150 °C - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMA5J28CAHM3/I datasheet, SMA5J28CAHM3/I pinout, SMA5J28CAHM3/I application, or SMA5J28CAHM3/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, bidirectional clamping behavior, thermal resistance (RθJA = 80 °C/W), and halogen-free RoHS-compliant construction per Vishay Document 88875 (Rev. 09-Jan-2024).
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ns) and low incremental surge resistance. Its bidirectional architecture enables symmetrical clamping across both polarities without external polarity management, making it suitable for AC-coupled or floating signal paths.
Rated for 500 W peak pulse power under standardized 10/1000 μs waveform, it sustains repetitive transients when mounted on 5.0 mm × 5.0 mm copper pads. The device meets MSL Level 1 (260 °C reflow) and is qualified to AEC-Q101 for automotive underhood and chassis applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse working voltage before leakage exceeds 1 μA; defines safe operating ceiling for protected line. |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - guaranteed breakdown range ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 45.4 V at 11.0 A - clamping voltage limits downstream IC stress during 500 W surge; critical for 3.3 V/5 V rail protection. |
| PPPM | 500 W (10/1000 μs) - energy-handling capacity sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| TJ max | +150 °C - enables placement near heat sources in engine control units or motor drives without derating. |
| RθJA | 80 °C/W - thermal resistance measured on standard 0.2" × 0.2" pads; informs PCB copper area requirements for sustained surge duty. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional - no polarity marking; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both ends) | Surge current path | Identical terminals; bidirectional conduction allows single-device placement across AC signals or ungrounded buses. |
| Case | Thermal interface | Plastic body with UL 94 V-0 rating; requires soldered pad contact for thermal dissipation - no internal thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of differential pairs (e.g., RS-485, CAN FD) without polarity-sensitive layout or additional components. |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock - supports PPAP documentation. |
| Halogen-free & RoHS | HM3 suffix confirms compliance with JEDEC J-STD-201 Class 2 whisker resistance and EU RoHS Directive 2011/65/EU Annex II. |
| Low RINC | Minimizes voltage overshoot during fast-rising transients (e.g., ESD > 30 kV), improving clamping precision vs. higher-resistance TVS devices. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and pressure/temperature sensor outputs in engine control modules against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to limit transient voltage to ≤45.4 V before reaching ASIC input pins. Use Value: Prevents latch-up or gate oxide damage in 3.3 V microcontrollers while maintaining signal integrity due to low capacitance (<100 pF at 0 V). |
Use Scenario: Safeguarding PLC digital input cards exposed to 24 V DC field wiring subject to relay coil flyback and lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated (28 V) suppression element absorbing up to 500 W pulses without degradation across 10⁵+ events. Use Value: Eliminates need for series impedance or gas discharge tubes - reduces BOM count and board space in DIN-rail mounted controllers. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Shielding Ethernet PHY magnetics secondary side and PoE-powered device inputs from induced surges on building-wide cabling. IC Role / Device Role / Timing Role: Secondary-side TVS on isolated 3.3 V/5 V bias rails, leveraging bidirectional symmetry for common-mode transient rejection. Use Value: Maintains IEEE 802.3af/at compliance by clamping within 1 ns and surviving repeated 10/1000 μs surges up to 500 W. |
Use Scenario: Protecting MCU GPIOs driving brushed DC motor H-bridges in washing machines and HVAC blowers from back-EMF spikes. IC Role / Device Role / Timing Role: Localized clamp at motor driver IC supply pins, rated for 150 °C ambient to survive enclosure heat buildup. Use Value: Extends field failure MTBF by preventing cumulative degradation of logic-level MOSFET gates during daily motor commutation cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ28CA | Same VWM (28 V), lower PPPM (400 W), higher VC (48.4 V at 8.3 A); non-AEC-Q101; MSL Level 1 only. | Not qualified for automotive underhood use; suitable for commercial-grade industrial controls where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive qualification and 500 W headroom is unnecessary. |
| ON Semiconductor SMCJ28CA | Same VWM/VBR range, higher PPPM (1500 W), larger SMC (DO-214AB) package (7.11 mm x 6.22 mm), RθJA ≈ 35 °C/W. | Requires more PCB area but delivers 3× surge energy handling; better for infrequent high-energy events like lightning coupling. | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and thermal margin is constrained. |
Compared with SMA5J28CAHM3/I, SMAJ28CA offers lower cost but reduced surge robustness and no automotive qualification, while SMCJ28CA trades compact size for significantly higher power handling and improved thermal performance - selection depends on PCB area budget, qualification requirements, and worst-case surge profile.
Availability
SMA5J28CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, and telecom line interface designs requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMA5J28CAHM3/I 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, power density, and automotive-grade qualification.
The SMA5JxxCA family delivers high-power-density TVS protection in compact SMA packages, engineered specifically for AEC-Q101-compliant automotive electronics and ruggedized industrial systems demanding repeatable surge immunity.
FAQ
What does the "HM3" suffix indicate in SMA5J28CAHM3/I?
The HM3 suffix in SMA5J28CAHM3/I denotes halogen-free, RoHS-compliant construction meeting JEDEC J-STD-201 Class 2 whisker resistance, and full AEC-Q101 qualification. It replaces legacy "HE3" codes with enhanced environmental compliance while retaining identical electrical specs and thermal performance as documented in Vishay's 88875 datasheet.
Is SMA5J28CAHM3/I suitable for protecting CAN FD bus lines?
Yes, SMA5J28CAHM3/I is suitable for CAN FD bus protection due to its bidirectional clamping, low clamping voltage (45.4 V), and fast response time (<1 ns). Its 28 V VWM aligns with typical 24 V CAN FD supply rails, and AEC-Q101 qualification supports automotive deployment - confirmed in Vishay's application guidance for high-speed data line protection.
What is the maximum reverse leakage current for SMA5J28CAHM3/I at VWM?
The maximum reverse leakage current for SMA5J28CAHM3/I at its 28 V stand-off voltage (VWM) is 1.0 μA at TA = 25 °C, as specified in the Electrical Characteristics table of Vishay Document 88875. This low leakage ensures minimal power loss and signal distortion in always-on monitoring circuits.
Does SMA5J28CAHM3/I require derating above 25 °C ambient?
Yes, SMA5J28CAHM3/I requires derating above 25 °C ambient temperature. Per Figure 2 in Vishay Document 88875, its peak pulse power capability decreases linearly from 500 W at 25 °C to approximately 250 W at 125 °C junction temperature - PCB layout must provide adequate copper area to maintain TJ ≤ 150 °C under repeated surge conditions.
How does the SMA (DO-214AC) package of SMA5J28CAHM3/I compare thermally to SMC (DO-214AB)?
The SMA (DO-214AC) package of SMA5J28CAHM3/I has a typical RθJA of 80 °C/W on standard 5.0 mm × 5.0 mm pads, versus ~35 °C/W for SMC-packaged equivalents like SMCJ28CA. This means SMA5J28CAHM3/I requires more careful thermal design - larger copper pours or thermal vias - to sustain high-duty-cycle surges without exceeding 150 °C junction temperature.
SMA5J28CAHM3/I 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMA5J28CAHM3/I FAQ
1.How can I place an order for SMA5J28CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J28CAHM3/I 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 SMA5J28CAHM3/I reliable?
The price and inventory of SMA5J28CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J28CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMA5J28CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J28CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J28CAHM3/I?
SMA5J28CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J28CAHM3/I 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 SMA5J28CAHM3/I?
For technical support, including SMA5J28CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J28CAHM3/I requirements.
6.How does Aetrix verify that SMA5J28CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMA5J28CAHM3/I 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 SMA5J28CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMA5J28CAHM3/I?
All SMA5J28CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J28CAHM3/I, 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 SMA5J28CAHM3/I part is unused and in its original packaging.
Return procedure for SMA5J28CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J28CAHM3/I Tags
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