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Vishay General Semiconductor - Diodes Division SMB8J28CAHE3_B/I
- Part No.:
- SMB8J28CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J28CAHE3_B/I.pdf
- Description:
- 800W,28V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,959
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Product details
Overview
SMB8J28CAHE3_B/I 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 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 SMB8J28CAHE3_B/I datasheet, SMB8J28CAHE3_B/I pinout, SMB8J28CAHE3_B/I application, or SMB8J28CAHE3_B/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM ≈ 1.62), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under transient overvoltage exceeding VBR, it avalanches to divert surge current away from downstream circuitry while maintaining VC ≤ 45.4 V. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM = 28 V).
Thermal performance is defined by RθJA = 72 °C/W and RθJL = 20 °C/W, enabling reliable operation up to TJ = +150 °C. The SMB package supports MSL Level 1 handling and lead-free soldering per J-STD-020 (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before significant leakage; sets upper limit for normal signal/power rail operation |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - defines precise avalanche initiation window for predictable clamping onset |
| VC @ IPPM | 45.4 V at IPPM = 17.6 A (10/1000 µs) - peak clamped voltage seen by protected IC; determines residual stress on downstream components |
| PPPM | 800 W - maximum non-repetitive surge power dissipation; validates suitability for IEC 61000-4-5 Level 3/4 surges |
| ID @ VWM | <1.0 µA - ultra-low reverse leakage ensures minimal power loss and signal integrity degradation in standby |
| TJ max | +150 °C - enables use in under-hood automotive environments and thermally constrained industrial enclosures |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking; matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix), MSL Level 1 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Identical terminals - bidirectional operation allows placement without orientation check; clamps both positive and negative transients |
| Case (body) | Thermal and mechanical interface | Exposed metal slug provides primary thermal path to PCB copper; requires minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) pad per terminal for rated power derating |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled and differential signal lines (e.g., CAN, LIN, RS-485) without polarity constraints |
| AEC-Q101 qualification | Validates long-term reliability in automotive applications including engine control units and ADAS sensor modules |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes voltage overshoot during surge events, reducing risk of latch-up or gate oxide damage in protected MOSFETs/ICs |
| MSL Level 1 rating | Enables direct placement into reflow ovens without dry-packaging or baking, streamlining high-volume SMT manufacturing |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh industrial environments |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt TVS diode placed directly at connector entry point to clamp transients before reaching ADC input or signal conditioner IC. Use Value: Limits induced voltage to ≤45.4 V during 17.6 A surge, preventing ADC saturation and preserving measurement accuracy across -40 °C to +125 °C ambient. |
Use Scenario: Safeguarding 24 V DC digital input cards in PLCs against field-wiring induced surges and relay contact bounce. IC Role / Device Role / Timing Role: Bidirectional clamping element across input terminals, absorbing energy from inductive kickback and EFT bursts. Use Value: Withstands 800 W peak pulse power and maintains <1.0 µA leakage at 28 V, ensuring stable logic threshold detection and zero false-triggering in noisy factory environments. |
| Telecom Line Interface | Consumer USB Port Protection |
|
Use Scenario: Shielding RS-485 transceivers in base station backhaul equipment from lightning-induced common-mode surges on twisted-pair lines. IC Role / Device Role / Timing Role: Paired bidirectional TVS on differential pair (A/B lines), referenced to ground, providing symmetrical clamping. Use Value: Matches differential signaling requirements with matched VBR (±0.3 V tolerance) and low capacitance (typ. 100 pF at 0 V), preserving signal integrity up to 10 Mbps. |
Use Scenario: Adding secondary surge protection on VBUS and D+/D− lines of USB 2.0 ports in smart home hubs subjected to ESD and hot-plug transients. IC Role / Device Role / Timing Role: Low-capacitance TVS array component placed after primary ESD diode to handle higher-energy surges beyond IEC 61000-4-2. Use Value: Clamps 8 kV contact ESD events to <45.4 V within <1 ns, preventing latch-up in USB PHY ICs while maintaining full-speed data timing compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J28CAHM3_B/I | Halogen-free variant; identical electrical specs and AEC-Q101 qualification | No difference - suitable for same automotive/industrial applications requiring halogen-free compliance | Select when RoHS + halogen-free material declaration is required for end-product certification |
| SMAJ28CAHE3/A | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (90 °C/W) | Limited to lower-energy surges; not recommended for IEC 61000-4-5 Level 4 or automotive load dump | Choose only for space-constrained consumer designs where 800 W surge capacity is unnecessary |
Compared with SMB8J28CAHE3_B/I, the HM3 variant offers identical protection performance with halogen-free construction, while the SMAJ28CAHE3/A trades surge robustness for footprint reduction - making SMB8J28CAHE3_B/I optimal for high-reliability 800 W surge environments.
Availability
SMB8J28CAHE3_B/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom line interfaces, and consumer USB port protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMB8J28CAHE3_B/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 and application-specific optimization.
The SMB8JxxCA series targets high-power transient suppression in automotive and industrial systems, engineered to meet AEC-Q101 and IEC 61000-4-5 standards with optimized clamping response and thermal robustness.
FAQ
What is the clamping voltage of SMB8J28CAHE3_B/I at its rated peak pulse current?
The SMB8J28CAHE3_B/I has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current (IPPM) of 17.6 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components experience no more than 45.4 V during surge events. The SMB8J28CAHE3_B/I maintains this clamping performance across its qualified operating temperature range.
Is SMB8J28CAHE3_B/I suitable for automotive applications?
Yes, SMB8J28CAHE3_B/I is AEC-Q101 qualified and specifically designed for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its construction includes glass-passivated junctions, MSL Level 1 moisture sensitivity, and guaranteed operation from –55 °C to +150 °C. The HE3 suffix confirms RoHS compliance and automotive qualification - making SMB8J28CAHE3_B/I appropriate for under-hood and chassis-mounted systems.
How does the bidirectional configuration of SMB8J28CAHE3_B/I affect PCB layout?
The SMB8J28CAHE3_B/I has no polarity marking and identical anode/cathode terminals, allowing orientation-agnostic placement on PCBs - eliminating assembly errors and simplifying automated pick-and-place. Layout requires symmetric 0.2" × 0.2" copper pads per terminal for thermal performance and surge current handling. No silkscreen polarity indicator is needed, reducing design overhead and increasing layout flexibility for differential or AC-coupled lines.
What is the maximum reverse leakage current for SMB8J28CAHE3_B/I at its stand-off voltage?
At its stand-off voltage (VWM) of 28 V and TA = 25 °C, the SMB8J28CAHE3_B/I exhibits a maximum reverse leakage current (ID) of 1.0 µA. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes quiescent power loss in battery-powered systems. Leakage remains within specification up to +125 °C ambient, validated per AEC-Q101 thermal testing protocols for SMB8J28CAHE3_B/I.
Can SMB8J28CAHE3_B/I be used in place of unidirectional TVS diodes like SMB10J28A?
No - SMB8J28CAHE3_B/I is strictly bidirectional and cannot replace unidirectional types such as SMB10J28A in DC-biased circuits where forward conduction must be blocked. While both share VWM = 28 V and similar clamping, SMB10J28A conducts only in reverse and blocks forward current, whereas SMB8J28CAHE3_B/I clamps symmetrically. Substitution would compromise circuit functionality in applications like 12 V power rail protection; SMB8J28CAHE3_B/I is intended for AC, differential, or floating-node protection.
SMB8J28CAHE3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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:
- 28V
- 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)
SMB8J28CAHE3_B/I FAQ
1.How can I place an order for SMB8J28CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J28CAHE3_B/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 SMB8J28CAHE3_B/I reliable?
The price and inventory of SMB8J28CAHE3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J28CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SMB8J28CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J28CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J28CAHE3_B/I?
SMB8J28CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J28CAHE3_B/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 SMB8J28CAHE3_B/I?
For technical support, including SMB8J28CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J28CAHE3_B/I requirements.
6.How does Aetrix verify that SMB8J28CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMB8J28CAHE3_B/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 SMB8J28CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SMB8J28CAHE3_B/I?
All SMB8J28CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J28CAHE3_B/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 SMB8J28CAHE3_B/I part is unused and in its original packaging.
Return procedure for SMB8J28CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J28CAHE3_B/I Tags
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