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Vishay General Semiconductor - Diodes Division SMB8J28CAHM3_A/H
- Part No.:
- SMB8J28CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J28CAHM3_A/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J28CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) 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, 45.4 V maximum clamping voltage (VC) at 17.6 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J28CAHM3_A/H datasheet, SMB8J28CAHM3_A/H pinout, SMB8J28CAHM3_A/H application, or SMB8J28CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and thermal resistance (RθJA = 72 °C/W) for reliable operation in under-hood and motor-control environments.
Technical Context
This device operates as a voltage-clamped shunt protector, responding within picoseconds to transients exceeding its VWM threshold and diverting surge energy to ground. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 µA at VWM), while the bidirectional architecture supports AC-coupled lines without polarity constraints.
Rated for TJ = –55 °C to +150 °C and qualified per AEC-Q101, SMB8J28CAHM3_A/H sustains repetitive surge events when mounted on 5.0 mm × 5.0 mm copper pads, with derating applied above 25 °C ambient per Fig. 2. Its MSL Level 1 rating and matte tin-plated leads support lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe signal swing range for protected line. |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - Tight breakdown window ensures predictable turn-on and minimal overvoltage exposure during ESD or load dump. |
| VC @ IPPM | 45.4 V at 17.6 A (10/1000 µs) - Clamping voltage limits downstream IC stress; enables protection of 3.3 V–24 V logic and analog circuits. |
| PPPM | 800 W - Peak surge power handling capacity; sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | <1.0 µA - Ultra-low leakage preserves signal integrity and battery life in always-on sensor nodes and low-power systems. |
| TJ max | +150 °C - Enables deployment in engine control units, motor drivers, and other high-temperature automotive zones. |
| Package | SMB (DO-214AA) - Surface-mount footprint (4.57 mm × 3.94 mm × 2.20 mm) compatible with automated placement and IPC-7351B land patterns. |
Pinout & Package
SMB8J28CAHM3_A/H uses the standard SMB (DO-214AA) package: two-terminal, non-polarized bidirectional device with no cathode marking. Terminals are matte tin-plated and solderable per J-STD-002/JESD 22-B102; mounting requires 5.0 mm × 5.0 mm copper pads per terminal per datasheet Fig. 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Surge current path | Both terminals function identically; bidirectional conduction allows placement across AC signals or uncommitted lines without orientation check. |
| Case (body) | Thermal interface | No electrical connection; thermally coupled to PCB copper for heat dissipation - RθJA = 72 °C/W measured on specified pad layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain, chassis, and ADAS sensors - supports PPAP and long-term reliability requirements. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental regulations and eliminates corrosive halogen emissions during board rework or end-of-life processing. |
| Low incremental surge resistance | Enables tighter VC/VBR ratio (1.45×) - reduces let-through energy compared to higher-resistance TVS devices in same power class. |
| MSL Level 1, 260 °C peak reflow | Eliminates moisture sensitivity concerns and bake requirements - simplifies SMT line integration and reduces manufacturing cost. |
| Glass passivated junction | Ensures stable parametric performance over temperature and lifetime; prevents degradation from humidity or bias stress in harsh environments. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector or IC input pins to clamp surges before they reach sensitive front-end circuitry. Use Value: Prevents latch-up or permanent damage to 5 V/12 V sensor signal chains while maintaining <1 µA leakage to avoid offset errors in precision analog paths. |
Use Scenario: Safeguarding digital and analog inputs/outputs of programmable logic controllers against field wiring surges, ground loops, and electrostatic discharge in factory automation. IC Role / Device Role / Timing Role: Bidirectional clamping element on 24 V DC I/O channels, enabling robust operation in electrically noisy plant-floor environments. Use Value: Withstands repeated 800 W surges without parameter shift, eliminating need for fuse coordination or redundant protection stages in modular I/O modules. |
| Consumer Power Adapter Interface | Telecom Line Card Surge Suppression |
Use Scenario: Input-stage protection for USB-C PD adapters and multi-port chargers exposed to mains-borne transients and hot-plug events. IC Role / Device Role / Timing Role: First-line defense across primary-side DC bus (e.g., post-bridge rectifier) to limit voltage overshoot during AC line switching. Use Value: 28 V VWM aligns with 24 V nominal adapter rails; 45.4 V clamping ensures secondary-side regulators remain within absolute maximum ratings during 1 kV/0.5 J surges. |
Use Scenario: Protecting Ethernet PHYs and POTS line interfaces in network edge equipment from lightning-induced surges and AC power cross-talk. IC Role / Device Role / Timing Role: Bidirectional TVS placed differential-mode across twisted-pair lines (e.g., RJ45 pins 1–2, 3–6) to suppress common-mode and differential-mode transients. Use Value: Symmetrical clamping behavior maintains signal integrity on high-speed links; low capacitance (<100 pF typical) avoids signal rise-time degradation at 100BASE-TX speeds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J28CAHE3_A/H | Same electrical specs, but RoHS-compliant commercial grade (not halogen-free); lacks AEC-Q101 qualification. | Approved for industrial/commercial use only; not suitable for automotive production or PPAP-submission programs. | Select when halogen-free content is not mandated and automotive qualification is unnecessary - lower cost, identical footprint. |
| SMAJ28CA | Same VWM/VBR/VC ratings but in smaller SMA (DO-214AC) package; lower PPPM (400 W) and higher RθJA (100 °C/W). | Limited to lower-energy transients (IEC 61000-4-2 Level 4 only); unsuitable for ISO 7637-2 Pulse 5a or sustained load-dump events. | Choose for space-constrained consumer designs where 400 W surge margin suffices and thermal budget permits higher junction temperature rise. |
Compared with SMB8J28CAHE3_A/H, SMB8J28CAHM3_A/H adds halogen-free compliance and AEC-Q101 validation for automotive use; versus SMAJ28CA, it delivers double the surge power and superior thermal performance in the same functional category - critical for mission-critical industrial and automotive deployments.
Availability
SMB8J28CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface designs requiring stable component supply, long-lifecycle support, and traceable AEC-Q101 qualified parts.
Supply support for SMB8J28CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMB8JxxCA series targets high-reliability transient suppression in automotive and industrial systems, engineered to meet stringent AEC-Q101 and IEC/EN 61000-4-x standards while supporting automated SMT assembly.
FAQ
What is the clamping voltage of SMB8J28CAHM3_A/H at its rated peak pulse current?
The SMB8J28CAHM3_A/H has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current (IPPM) of 17.6 A using the standardized 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and ensures downstream components remain within safe voltage limits during surge events. The SMB8J28CAHM3_A/H achieves this performance via low incremental surge resistance and optimized junction design.
Is SMB8J28CAHM3_A/H suitable for automotive applications?
Yes, SMB8J28CAHM3_A/H is AEC-Q101 qualified and specifically intended for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its halogen-free construction (HM3 suffix), MSL Level 1 rating, and operation up to +150 °C junction temperature meet OEM requirements for under-hood and chassis-mounted systems. The SMB8J28CAHM3_A/H is listed in Vishay's automotive-grade product portfolio with full PPAP documentation support.
How does the bidirectional configuration of SMB8J28CAHM3_A/H affect its circuit placement?
The SMB8J28CAHM3_A/H is symmetrical and bidirectional, meaning both terminals are functionally identical - no cathode marking is present, and orientation during placement is irrelevant. This simplifies PCB layout and automated assembly for AC-coupled lines, differential buses (e.g., RS-485, CAN), or uncommitted I/O protection. Unlike unidirectional TVS diodes, the SMB8J28CAHM3_A/H clamps surges of either polarity without requiring external polarity management.
What is the thermal resistance of SMB8J28CAHM3_A/H, and how does it impact layout?
SMB8J28CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on the recommended 5.0 mm × 5.0 mm copper pads per terminal. This value assumes the layout defined in Vishay's datasheet Figure 6; reducing pad area increases RθJA and risks thermal runaway during repetitive surges. To maintain reliability, designers must adhere to the specified pad dimensions and ensure adequate copper pour around both terminals - a critical requirement for the SMB8J28CAHM3_A/H in high-duty-cycle applications.
Does SMB8J28CAHM3_A/H meet RoHS and halogen-free compliance standards?
Yes, SMB8J28CAHM3_A/H carries the HM3 suffix, indicating it is both RoHS-compliant and halogen-free per IEC 61249-2-21. This satisfies strict environmental mandates for automotive and industrial markets, including EU ELV and China RoHS II. The halogen-free status eliminates brominated flame retardants and chlorine-based compounds, reducing corrosivity during soldering and improving long-term reliability in humid or chemically aggressive environments - a verified specification for the SMB8J28CAHM3_A/H.
SMB8J28CAHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 17.6A
- Power - Peak Pulse:
- 800W
- 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-214AA (SMB)
SMB8J28CAHM3_A/H FAQ
1.How can I place an order for SMB8J28CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J28CAHM3_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 SMB8J28CAHM3_A/H reliable?
The price and inventory of SMB8J28CAHM3_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 SMB8J28CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J28CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J28CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J28CAHM3_A/H?
SMB8J28CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J28CAHM3_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 SMB8J28CAHM3_A/H?
For technical support, including SMB8J28CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J28CAHM3_A/H requirements.
6.How does Aetrix verify that SMB8J28CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J28CAHM3_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 SMB8J28CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J28CAHM3_A/H?
All SMB8J28CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J28CAHM3_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 SMB8J28CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMB8J28CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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