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Vishay General Semiconductor - Diodes Division SMB8J28CAHE3_A/I
- Part No.:
- SMB8J28CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J28CAHE3_A/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,131
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Product details
Overview
SMB8J28CAHE3_A/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_A/I datasheet, SMB8J28CAHE3_A/I pinout, SMB8J28CAHE3_A/I application, or SMB8J28CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM ≈ 1.62), thermal resistance (RθJA = 72 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 28 V), but triggers into low-impedance conduction when transient voltage exceeds VBR, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
Designed per ANSI/IEEE C62.35 standards, SMB8J28CAHE3_A/I delivers repeatable clamping performance across -55 °C to +150 °C junction temperature range, with MSL Level 1 moisture sensitivity and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping initiates; defines safe signal line operating margin. |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - tight breakdown tolerance ensures predictable turn-on across production lots. |
| VC @ IPPM | 45.4 V at 17.6 A - clamping voltage limits stress on protected ICs during 10/1000 µs transients. |
| PPPM | 800 W - peak pulse power handling capacity with standard 10/1000 µs waveform; enables robust ESD/EFT/lightning surge immunity. |
| ID @ VWM | 1.0 µA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss. |
| TJ max | +150 °C - extended junction temperature rating supports under-hood automotive and high-ambient industrial use. |
| RθJA | 72 °C/W - thermal resistance informs PCB pad design; requires ≥5.0 mm × 5.0 mm copper area per terminal for rated power dissipation. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking (unlike unidirectional variants which feature cathode band).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (during positive half-cycle) | Connects to protected line; conducts when voltage exceeds +VBR relative to cathode. |
| Cathode | Transient current entry point (during negative half-cycle) | Connects to protected line; conducts when voltage falls below –VBR relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment interfaces. |
| Glass passivated junction | Ensures long-term stability of VBR and low leakage drift over temperature and lifetime. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow without popcorn effect or parametric shift. |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed industrial and automotive enclosures. |
| Matte tin-plated leads | Guarantees reliable solder wetting and intermetallic formation per J-STD-002 and JESD 22-B102. |
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 ISO 7637-2 pulses. IC Role / Device Role: Bidirectional shunt clamp placed between signal line and ground, absorbing ±100 V/500 ms transients. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V interface ICs while maintaining <1 µA leakage at 28 V operating voltage. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers against inductive kickback from solenoid/relay switching. IC Role / Device Role: Parallel-connected TVS on 24 V DC input lines, clamping surges up to 800 W without derating at 85 °C ambient. Use Value: Enables >100,000 surge cycles with <5 % VBR shift, eliminating need for fuse coordination or redundant protection stages. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
|
Use Scenario: Shielding Ethernet PHY front-end and PoE injectors from lightning-induced common-mode surges on twisted-pair cables. IC Role / Device Role: Paired bidirectional TVS devices across differential pairs, referenced to chassis ground via low-inductance layout. Use Value: Achieves <15 ns response time and clamps 1 kV/0.5 µs transients to <50 V, preserving signal integrity up to 100 Mbps. |
Use Scenario: Adding secondary-level surge immunity to USB-C and barrel-jack power inputs in smart home hubs and audio equipment. IC Role / Device Role: Final-stage clamping device after primary MOV/fuse, handling residual fast-rising ESD (IEC 61000-4-2 ±15 kV) and ringwave events. Use Value: Provides sub-100 ps response and <45.4 V clamping at 17.6 A, preventing brownout or reset during transient overload. |
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_A/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free materials are mandated by OEM sustainability policies. | Direct material substitution when halogen-free compliance is required; same footprint, thermal, and electrical behavior. |
| SMAJ28CA-E3/5B | Lower PPPM (400 W), higher RθJA (90 °C/W), SMA package (smaller pad area, lower surge margin). | Suitable only for lower-energy transients (<400 W) and non-automotive applications due to lack of AEC-Q101 qualification. | Select when cost or board space is critical and surge threat level is limited to IEC 61000-4-5 Level 3 (0.5 kV); not recommended for automotive or industrial mains-connected systems. |
Compared with SMB8J28CAHE3_A/I, the HM3 variant offers identical protection performance with halogen-free construction, while SMAJ28CA-E3/5B trades 50 % peak power and automotive qualification for reduced size and cost - making it suitable only for light-duty consumer-grade surge suppression.
Availability
SMB8J28CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer power adapter designs requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMB8J28CAHE3_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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in harsh-environment signal and power-line applications.
FAQ
What is the clamping voltage of SMB8J28CAHE3_A/I at its rated peak pulse current?
The SMB8J28CAHE3_A/I 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 standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected downstream circuitry sees no more than 45.4 V during surge events - critical for safeguarding 3.3 V or 5 V logic interfaces. The clamping ratio (VC/VWM = 1.62) reflects efficient voltage limiting without excessive overshoot.
Is SMB8J28CAHE3_A/I suitable for automotive applications?
Yes, SMB8J28CAHE3_A/I is explicitly AEC-Q101 qualified and carries the "HE3" automotive ordering code suffix, confirming validation for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock. It is deployed in engine control units, ADAS camera modules, and body electronics where protection against load dump (ISO 7637-2) and ESD (ISO 10605) is mandatory. Its -55 °C to +150 °C operating range and MSL Level 1 reflow compatibility further support under-hood deployment.
How does the SMB8J28CAHE3_A/I differ from unidirectional variants like SMB10J28AHE3_A/I?
SMB8J28CAHE3_A/I is bidirectional, meaning it clamps voltage transients of either polarity symmetrically around 0 V - ideal for AC-coupled or differential signal lines. In contrast, SMB10J28AHE3_A/I is unidirectional with a defined cathode band and clamps only negative-going transients relative to its anode. Electrically, SMB8J28CAHE3_A/I has lower PPPM (800 W vs. 1000 W) and higher ID leakage (1.0 µA vs. 1.0 µA same, but unidirectional allows forward conduction). Both share the same VWM (28 V) and VC (45.4 V), but pin assignment and layout symmetry differ.
What PCB layout guidance applies to SMB8J28CAHE3_A/I for optimal thermal and surge performance?
For rated 800 W surge handling, SMB8J28CAHE3_A/I requires minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay Document 88422. Thermal vias under each pad (≥4 × 0.3 mm diameter) connected to inner-layer ground planes reduce RθJA and prevent localized overheating. Avoid narrow traces between TVS and protected node - keep path length <5 mm and width ≥1 mm to minimize inductance and preserve clamping speed. No silkscreen or solder mask over pads is recommended for maximum thermal conduction.
Does SMB8J28CAHE3_A/I require external biasing or control circuitry?
No, SMB8J28CAHE3_A/I is a passive, two-terminal device requiring no external bias, drive signal, or control logic. It operates autonomously based solely on voltage across its terminals: presenting high impedance below VBR and transitioning to low-impedance conduction above VBR in either polarity. This self-acting behavior eliminates design complexity, reduces BOM count, and ensures fail-safe operation - if the device fails short, upstream fusing protects the system; open-circuit failure mode is statistically negligible per AEC-Q101 accelerated life testing.
SMB8J28CAHE3_A/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:
- 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:
- -
- 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_A/I FAQ
1.How can I place an order for SMB8J28CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J28CAHE3_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 SMB8J28CAHE3_A/I reliable?
The price and inventory of SMB8J28CAHE3_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 SMB8J28CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMB8J28CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J28CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J28CAHE3_A/I?
SMB8J28CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J28CAHE3_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 SMB8J28CAHE3_A/I?
For technical support, including SMB8J28CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J28CAHE3_A/I requirements.
6.How does Aetrix verify that SMB8J28CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J28CAHE3_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 SMB8J28CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMB8J28CAHE3_A/I?
All SMB8J28CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J28CAHE3_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 SMB8J28CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMB8J28CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J28CAHE3_A/I Tags
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