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Vishay General Semiconductor - Diodes Division SMB8J30CA-E3/5B
- Part No.:
- SMB8J30CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J30CA-E3/5B.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J30CA-E3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on power and signal lines. It features a 30 V stand-off voltage (VWM), 48.4 V clamping voltage (VC) at 16.5 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMB8J30CA-E3/5B datasheet, SMB8J30CA-E3/5B pinout, SMB8J30CA-E3/5B application, or SMB8J30CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT assembly on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional symmetry enables protection of AC-coupled or floating lines without polarity concerns.
Rated for -55 °C to +150 °C junction temperature, it meets MSL Level 1 per J-STD-020 (260 °C peak reflow), supports 1000-cycle 8.3 ms surge endurance, and maintains <1.0 µA reverse leakage at 30 V - critical for low-power sensor front-ends and always-on automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin for 24 V automotive or 28 V industrial rails. |
| VBR min/max | 33.3 V / 36.8 V at 1.0 mA - breakdown threshold range ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 48.4 V at 16.5 A - clamping voltage under full 10/1000 µs surge; limits downstream IC stress to safe levels during ISO 7637-2 Pulse 1/2/5a events. |
| PPPM | 800 W - peak pulse power handling with 10/1000 µs waveform; supports EN 61000-4-5 Level 3 (2 kV/12 Ω) surge immunity. |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage preserves battery life in always-on vehicle ECU wake-up circuits and IoT sensor nodes. |
| RθJL | 20 °C/W - low junction-to-lead thermal resistance enables reliable power dissipation without external heatsinking on standard PCB copper. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including HTOL, TC, UHAST, and mechanical shock per AEC specification. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminals accept either orientation in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both ends) | Surge current path | Identical bidirectional terminals; conducts equally in both directions above VBR - eliminates need for orientation-aware placement. |
| Case (body) | Thermal conduction path | Plastic-molded SMB body transfers heat to PCB copper pads; requires minimum 5.0 mm × 5.0 mm pad per terminal per datasheet fig. 2. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and humidity exposure - critical for under-hood automotive environments. |
| MSL Level 1 rating | Enables single-pass reflow at 260 °C peak without popcorn failure - compatible with standard lead-free SMT lines. |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, high-temperature operating life, and ESD robustness. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients - protects sensitive 3.3 V or 5 V logic interfaces downstream. |
| Halogen-free option available | M3 suffix variant meets RoHS and JEDEC J-STD-209 material restrictions - supports green manufacturing compliance. |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching spikes in engine control units. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry point before signal conditioning circuitry. Use Value: Limits transient voltage to ≤48.4 V during ISO 7637-2 Pulse 5a (75 V/300 ms), preventing latch-up or gate oxide damage in 5 V tolerant transceivers. |
Use Scenario: Safeguarding 24 V DC digital input channels on programmable logic controller backplanes against field-wiring surges and relay contact bounce. IC Role / Device Role / Timing Role: Primary surge shunt device mounted adjacent to terminal block, coordinated with upstream fuse and downstream optocoupler isolation. Use Value: Absorbs 800 W surge energy without degradation, maintaining ≤1 µA leakage to avoid false triggering of 24 V wetting-current detection circuits. |
| Telecom Line Protection | Consumer Power Adapter Output |
|
Use Scenario: Shielding Ethernet PHY magnetics and PoE interface components from lightning-induced surges on outdoor network drops. IC Role / Device Role / Timing Role: Secondary-level protector located after gas discharge tube (GDT) primary stage, providing fast-response clamping for residual transients. Use Value: Sub-ns response time captures fast-rising edges missed by GDTs; 48.4 V VC ensures safe operation within IEEE 802.3af/at voltage tolerance windows. |
Use Scenario: Suppressing output-side transients caused by hot-plug events or capacitor inrush in USB-C PD adapters and multi-port chargers. IC Role / Device Role / Timing Role: Output rail clamp placed between secondary-side synchronous rectifier and USB-C CC logic, referenced to common ground. Use Value: Bidirectional capability accommodates reversible USB-C cable insertion; 30 V VWM aligns with 20 V PPS and 28 V EPR output profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA-E3/5B | Unidirectional variant with same VWM/VC but asymmetric conduction; lacks reverse conduction path. | Requires polarity-aware layout; unsuitable for AC or floating differential lines. | Select only when protecting DC-biased unidirectional signals with strict polarity control. |
| SMAJ30CA-E3/5B | Lower PPPM (400 W), smaller SMA (DO-214AC) package, higher RθJA (110 °C/W). | Limited to lower-energy transients; requires larger thermal pad or derating above 75 °C ambient. | Choose for space-constrained consumer designs where 800 W surge capacity is not required. |
Compared with SMBJ30CA-E3/5B and SMAJ30CA-E3/5B, SMB8J30CA-E3/5B delivers superior bidirectional surge handling in an AEC-Q101-qualified SMB package - making it the preferred choice for automotive and industrial systems demanding robust, polarity-agnostic protection without layout redesign.
Availability
SMB8J30CA-E3/5B is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC development, and telecom infrastructure projects requiring stable component supply and long-term lifecycle assurance.
Supply support for SMB8J30CA-E3/5B 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 and power efficiency.
The SMB8J series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-reliability transient suppression in harsh environments - including automotive, industrial automation, and communications infrastructure.
FAQ
What is the clamping voltage of SMB8J30CA-E3/5B at its rated peak pulse current?
The SMB8J30CA-E3/5B has a maximum clamping voltage (VC) of 48.4 V when subjected to its rated peak pulse current (IPPM) of 16.5 A using the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream circuitry. The SMB8J30CA-E3/5B maintains this performance across its qualified operating temperature range of -55 °C to +150 °C.
Is SMB8J30CA-E3/5B suitable for automotive applications?
Yes, SMB8J30CA-E3/5B is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood and chassis-mounted modules. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility, and validation across temperature cycling, high-temperature operating life, and mechanical shock tests. The SMB8J30CA-E3/5B meets requirements for ISO 7637-2 and ISO 16750-2 transient immunity in 12 V and 24 V vehicle networks.
How does SMB8J30CA-E3/5B differ from unidirectional SMBJ30CA-E3/5B?
The SMB8J30CA-E3/5B is bidirectional with symmetrical breakdown and clamping behavior in both polarities, while SMBJ30CA-E3/5B is unidirectional and conducts only in reverse bias. This makes SMB8J30CA-E3/5B appropriate for AC-coupled, floating, or polarity-agnostic lines - such as CAN bus, Ethernet pairs, or audio interfaces - whereas SMBJ30CA-E3/5B requires defined cathode/anode orientation and is limited to DC-biased rails. The SMB8J30CA-E3/5B also carries AEC-Q101 qualification out-of-the-box.
What is the thermal resistance from junction to lead (RθJL) for SMB8J30CA-E3/5B?
The SMB8J30CA-E3/5B has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, as specified in the Vishay datasheet (Document Number: 88422). This low value enables efficient heat transfer from the silicon die to the PCB copper pads through the SMB package leads - supporting reliable operation at full 800 W surge ratings without additional heatsinking when mounted per recommended 0.2" × 0.2" pad layout. This parameter is critical for thermal design validation in high-density automotive PCBs.
Does SMB8J30CA-E3/5B require orientation-specific placement on the PCB?
No, SMB8J30CA-E3/5B does not require orientation-specific placement because it is a bidirectional TVS diode with identical electrical characteristics in both directions. The SMB (DO-214AA) package has no polarity marking, and either end may serve as anode or cathode depending on transient polarity. This simplifies automated placement and eliminates risk of misorientation during SMT assembly - a key advantage over unidirectional variants like SMBJ30CA-E3/5B. The SMB8J30CA-E3/5B is therefore ideal for differential or floating signal paths.
SMB8J30CA-E3/5B 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 16.5A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J30CA-E3/5B FAQ
1.How can I place an order for SMB8J30CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J30CA-E3/5B 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 SMB8J30CA-E3/5B reliable?
The price and inventory of SMB8J30CA-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J30CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J30CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J30CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J30CA-E3/5B?
SMB8J30CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J30CA-E3/5B 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 SMB8J30CA-E3/5B?
For technical support, including SMB8J30CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J30CA-E3/5B requirements.
6.How does Aetrix verify that SMB8J30CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J30CA-E3/5B 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 SMB8J30CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J30CA-E3/5B?
All SMB8J30CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J30CA-E3/5B, 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 SMB8J30CA-E3/5B part is unused and in its original packaging.
Return procedure for SMB8J30CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J30CA-E3/5B Tags
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