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Vishay General Semiconductor - Diodes Division SMA5J28CAHM3_A/I
- Part No.:
- SMA5J28CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J28CAHM3_A/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,414
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Product details
Overview
SMA5J28CAHM3_A/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), 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 protect automotive sensor interfaces, industrial I/O ports, and telecom line drivers.
For engineers reviewing the SMA5J28CAHM3_A/I datasheet, SMA5J28CAHM3_A/I pinout, SMA5J28CAHM3_A/I application, or SMA5J28CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the low Rsurge minimizes voltage overshoot during high-current surges.
The device is rated for continuous operation from −55 °C to +150 °C junction temperature, with thermal resistance of 80 °C/W (junction-to-ambient) and 25 °C/W (junction-to-lead). It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive under-hood and chassis applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | 45.4 V at 11.0 A - clamped voltage during 500 W surge, limiting stress on downstream ICs |
| PPPM | 500 W - peak pulse power handling with 10/1000 μs waveform, critical for ISO 7637-2/IEC 61000-4-5 compliance |
| IPPM | 11.0 A - peak pulse current corresponding to VC, used to size PCB trace and layout for surge path |
| TJ max. | +150 °C - maximum junction temperature enabling use in under-hood automotive environments |
| Package | SMA (DO-214AC) - surface-mount package with 5.28 mm × 4.50 mm footprint, compatible with standard reflow profiles |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional types; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Bidirectional terminals - either lead serves as anode or cathode depending on transient polarity; no orientation required during placement |
| Case (body) | Thermal and mechanical interface | Non-electrical; provides mechanical anchoring and contributes to thermal dissipation via PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification |
| Halogen-free & RoHS-compliant | Meets JEDEC J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance requirements |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic interfaces |
| Glass-passivated junction | Ensures stable VBR over lifetime and across temperature, reducing parameter drift in harsh environments |
| Automated placement compatible | Standard SMA tape-and-reel packaging (7" or 13" reels) supports high-speed pick-and-place with zero orientation dependency |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in engine control units. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Withstands 500 W surges while clamping below 46 V, preserving integrity of 3.3 V/5 V microcontrollers and ADC front-ends in AEC-Q100 Grade 2 systems. |
Use Scenario: Safeguarding digital input/output channels of programmable logic controllers against field-induced surges from solenoid valves and motor drives. IC Role / Device Role / Timing Role: Primary transient suppressor on 24 V DC I/O lines, mounted adjacent to terminal block to minimize inductance in surge path. Use Value: Enables robust immunity to IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) up to ±1 kV/500 A, extending system uptime in factory automation. |
| Telecom Line Interface Protection | Consumer Power Adapter ESD Suppression |
Use Scenario: Shielding Ethernet PHYs, RS-485 transceivers, and PoE injectors from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Secondary-level protector located after gas discharge tube (GDT) or polymer PTC, providing fast clamping for residual transients. Use Value: Sub-1 ns response time captures fast-rising edges missed by slower primary protectors, preventing latch-up in high-speed communication ICs. |
Use Scenario: Adding ESD and surge resilience to AC-DC adapter secondary-side outputs (5 V/12 V rails) feeding USB ports or display modules. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) bidirectional clamp placed between output capacitor and connector to avoid signal distortion. Use Value: Maintains <10 μA leakage at 28 V, eliminating standby power loss while meeting IEC 61000-4-2 Level 4 (±15 kV air) requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J28CAHE3_A/I | Same electrical specs; RoHS-compliant but not halogen-free; AEC-Q101 qualified (HE3 suffix) | Preferred for commercial-automotive hybrids where halogen content is unrestricted | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 compliance is mandatory |
| SMBJ28CA | Same VWM/VC, but SMB package (DO-214AA); 600 W PPPM; higher thermal resistance (100 °C/W) | Better suited for lower-density boards with larger pad areas; less suitable for space-constrained automotive modules | Choose when higher surge margin is needed and board real estate allows larger footprint |
Compared with SMA5J28CAHM3_A/I, the HE3 variant offers identical automotive qualification without halogen-free constraint, while SMBJ28CA trades miniaturization for higher power rating and relaxed thermal design - making SMA5J28CAHM3_A/I optimal for compact, halogen-free, AEC-Q101–compliant designs.
Availability
SMA5J28CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and telecom line driver circuits requiring stable component supply, long-term lifecycle support, and consistent AEC-Q101–qualified material traceability.
Supply support for SMA5J28CAHM3_A/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMA5J series is engineered for high-power-density transient suppression in automotive, industrial, and communications systems - delivering robust 500 W surge handling in the compact SMA footprint with AEC-Q101 validation.
FAQ
What does the "HM3" suffix indicate in SMA5J28CAHM3_A/I?
The HM3 suffix in SMA5J28CAHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with JESD201 Class 2 whisker resistance, MSL Level 1 moisture sensitivity, and automotive-grade reliability testing - distinguishing it from commercial-grade (E3) or non-halogen-free automotive (HE3) variants.
Is SMA5J28CAHM3_A/I suitable for protecting 3.3 V logic circuits?
No - SMA5J28CAHM3_A/I is not appropriate for direct 3.3 V logic protection due to its 28 V stand-off voltage (VWM). It is intended for 24 V systems such as automotive body control modules or industrial 24 V I/O. For 3.3 V circuits, lower-voltage TVS devices like SMAJ3.3A or DFN-based solutions are required.
How is the bidirectional behavior of SMA5J28CAHM3_A/I implemented physically?
SMA5J28CAHM3_A/I uses a back-to-back diode configuration within a single die, enabling symmetrical clamping for both polarities. Unlike unidirectional TVS diodes, it has no cathode band marking and functions identically regardless of terminal orientation - simplifying layout and eliminating polarity verification during assembly.
What is the recommended PCB pad layout for SMA5J28CAHM3_A/I?
Vishay specifies mounting SMA5J28CAHM3_A/I on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 500 W pulse power. Smaller pads reduce thermal dissipation and derate peak surge capability - refer to Figure 2 in document 88875 for temperature-dependent derating curves.
Does SMA5J28CAHM3_A/I meet ISO 7637-2 Pulse 5a requirements?
Yes - SMA5J28CAHM3_A/I's 500 W peak pulse power and 45.4 V clamping voltage at 11 A enable compliance with ISO 7637-2 Pulse 5a (load dump) when used with appropriate series impedance (e.g., 1 Ω resistor or choke) and proper PCB layout. Full system validation remains the designer's responsibility.
SMA5J28CAHM3_A/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:
- Active
- 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_A/I FAQ
1.How can I place an order for SMA5J28CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J28CAHM3_A/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_A/I reliable?
The price and inventory of SMA5J28CAHM3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for SMA5J28CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J28CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J28CAHM3_A/I?
SMA5J28CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J28CAHM3_A/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_A/I?
For technical support, including SMA5J28CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J28CAHM3_A/I requirements.
6.How does Aetrix verify that SMA5J28CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMA5J28CAHM3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of SMA5J28CAHM3_A/I?
All SMA5J28CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J28CAHM3_A/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_A/I part is unused and in its original packaging.
Return procedure for SMA5J28CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J28CAHM3_A/I Tags
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