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Vishay General Semiconductor - Diodes Division SMBJ30CA-E3/5B
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- Part No.:
- SMBJ30CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30CA-E3/5B.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBJ30CA-E3/5B from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features a 30 V stand-off voltage (VWM), 48.4 V maximum clamping voltage at 12.4 A peak pulse current (IPPM), and 600 W peak pulse power capability with 10/1000 µs waveform - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ30CA-E3/5B datasheet, SMBJ30CA-E3/5B pinout, SMBJ30CA-E3/5B application, or SMBJ30CA-E3/5B equivalent, key selection criteria include bidirectional clamping symmetry, low clamping ratio (VC/VWM = 1.61), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped surge protector with symmetrical breakdown behavior in both polarities due to its bidirectional construction. Its glass-passivated junction ensures stable avalanche characteristics, while the low incremental surge resistance (calculated as (VC − VBR)/IPPM ≈ 0.27 Ω) supports effective energy diversion during fast transients.
The SMBJ30CA-E3/5B delivers consistent clamping performance across −55 °C to +150 °C junction temperature range and maintains ≤1.0 µA reverse leakage at 30 V (VWM), enabling reliable operation in low-power sensor signal paths without loading effects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 30 V - Maximum continuous reverse voltage before significant conduction begins; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 33.3–36.8 V at 1 mA - Guaranteed avalanche initiation range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 48.4 V at 12.4 A IPPM - Peak voltage seen by protected circuit during 10/1000 µs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 600 W - Surge energy handling capacity under standardized 10/1000 µs waveform; validates suitability for IEC 61000-4-5 Level 3/4 threats. |
| ID (Reverse Leakage) | ≤1.0 µA at 30 V - Minimal DC loading on signal lines; preserves accuracy in high-impedance analog or digital interfaces. |
| TJ max. | +150 °C - Enables use in under-hood automotive modules or enclosed industrial enclosures without derating concerns. |
| Package | SMB (DO-214AA) - Standardized 2-pin SMD outline with 5.21 mm × 4.06 mm footprint; compatible with IPC-7351B land patterns. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity surge) | Conducts during negative-going transients; forms symmetrical clamping path with cathode. |
| Cathode | Transient current entry (positive polarity surge) | Conducts during positive-going transients; enables bidirectional protection without external series components. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR min/max (33.3–36.8 V) and VC (48.4 V) in both directions - eliminates need for polarity-aware layout in AC-coupled or floating lines. |
| 600 W peak pulse power | Validated with 10/1000 µs waveform at 0.01% duty cycle - meets IEC 61000-4-5 surge immunity requirements for industrial Ethernet and RS-485 ports. |
| Low clamping ratio | VC/VWM = 1.61 - minimizes voltage overshoot during surge, reducing risk of latch-up or damage in 3.3 V/5 V logic interfaces. |
| MSL Level 1 rating | Reflow-compatible up to 260 °C peak - supports standard lead-free reflow profiles without baking or special handling. |
| AEC-Q101 qualification option | Available in HE3/HM3 variants - enables drop-in use in automotive body electronics where SMBJ30CA-E3/5B serves as commercial-grade baseline. |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
Use Scenario: Protecting analog output (4–20 mA) and digital I/O (RS-485) lines in factory-floor pressure/temperature sensors exposed to motor switching noise and ESD. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector entry point to clamp ±1 kV EFT and ±2 kV contact ESD per IEC 61000-4-2/4-4. Use Value: Limits transient voltage to ≤48.4 V, preventing damage to precision ADCs and isolated RS-485 transceivers rated for 5.5 V supply rails. |
Use Scenario: Shielding Ethernet PHY interface and POTS line drivers in VoIP gateways against lightning-induced surges and AC power cross-talk. IC Role / Device Role / Timing Role: Primary-level surge suppressor on differential pairs, coordinated with GDT or polymer PTC secondary protection. Use Value: Clamps common-mode surges to <50 V within 1 ns, preserving signal integrity and avoiding PHY reset during 10/700 µs telecom surges. |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
Use Scenario: Safeguarding LIN bus transceivers and LED driver ICs in door module ECUs subjected to load dump and jump-start transients. IC Role / Device Role / Timing Role: Secondary protection stage after primary TVS or Zener array; handles repetitive low-energy spikes from solenoid actuation. Use Value: Withstands 1000+ surge events at 12.4 A without parameter shift, ensuring long-term reliability in 12 V vehicle electrical systems. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machine control boards and HVAC blower assemblies. IC Role / Device Role / Timing Role: Parallel-connected across motor terminals to absorb inductive kickback energy during MOSFET switching. Use Value: Dissipates 600 W peak pulses without thermal runaway, extending lifespan of gate drivers and MCU I/O pins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package. | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy. | Direct material substitution where halogen content must be controlled; same layout and thermal profile. |
| SAC30CA-13-F | Same VWM (30 V) and VC (48.4 V), but in smaller SOD-123FL package (2.7 mm × 1.7 mm); 400 W PPPM rating. | Lower surge capacity limits use to lower-threat environments (e.g., USB port ESD only); not suitable for IEC 61000-4-5 Level 4. | Choose when board space is constrained and surge threat level is ≤400 W; verify thermal dissipation on reduced pad area. |
Compared with SMBJ30CA-E3/5B, the M3/5B offers identical protection performance with halogen-free materials, while SAC30CA-13-F trades 33 % lower peak power for 50 % smaller footprint - requiring threat-level validation before replacement.
Availability
SMBJ30CA-E3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and automotive body control modules requiring stable component supply and full traceability from Vishay General Semiconductor.
Supply support for SMBJ30CA-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, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was engineered for robust transient suppression in harsh electromagnetic environments, targeting industrial automation, telecom infrastructure, and automotive subsystems where failure tolerance is critical.
FAQ
What is the maximum clamping voltage of SMBJ30CA-E3/5B at its rated peak pulse current?
The SMBJ30CA-E3/5B has a maximum clamping voltage (VC) of 48.4 V at 12.4 A peak pulse current (IPPM) under the 10/1000 µs waveform condition. This value is measured across the device terminals during surge testing and defines the upper voltage limit imposed on protected circuits - a critical parameter for ensuring downstream ICs remain within absolute maximum ratings. The SMBJ30CA-E3/5B achieves this clamping performance while maintaining symmetrical behavior in both polarities.
Is SMBJ30CA-E3/5B suitable for automotive applications?
SMBJ30CA-E3/5B is a commercial-grade part and not AEC-Q101 qualified; however, it shares identical electrical and mechanical specifications with the AEC-Q101-qualified SMBJ30CAHE3_B/I variant. For non-safety-critical automotive body electronics (e.g., mirror controls or ambient lighting), SMBJ30CA-E3/5B may be used with customer validation. The SMBJ30CA-E3/5B datasheet confirms operation from −55 °C to +150 °C, supporting under-hood temperature ranges when thermally managed.
How does the bidirectional design of SMBJ30CA-E3/5B affect PCB layout?
The SMBJ30CA-E3/5B has no polarity marking and conducts identically in both directions, eliminating the need for orientation-aware placement on PCBs. This simplifies layout for AC-coupled lines, differential buses (e.g., RS-485), or floating grounds where voltage polarity reversal is possible. Unlike unidirectional TVS diodes, the SMBJ30CA-E3/5B requires no series blocking diode or directional routing - reducing component count and board area while maintaining full surge coverage.
What is the thermal resistance of SMBJ30CA-E3/5B, and how does it impact power dissipation?
The SMBJ30CA-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 5.0 mm × 5.0 mm copper pads. This means a 5.0 W steady-state power dissipation (PD) would raise junction temperature by 500 °C above ambient - which is why PD rating applies only at TA = 50 °C with infinite heatsink assumption. In practice, the SMBJ30CA-E3/5B is intended for transient, not continuous, power dissipation; its 600 W PPPM rating reflects short-duration energy absorption, not steady-state thermal limits.
Can SMBJ30CA-E3/5B replace SMBJ30A-E3/5B in a design?
No - SMBJ30CA-E3/5B and SMBJ30A-E3/5B are not interchangeable without circuit review. The "CA" suffix denotes bidirectional operation, while "A" indicates unidirectional. SMBJ30A-E3/5B has a cathode band and conducts only during positive surges; using it in place of SMBJ30CA-E3/5B leaves the circuit vulnerable to negative transients. The SMBJ30CA-E3/5B provides symmetrical protection essential for AC signals or floating references, whereas SMBJ30A-E3/5B requires external polarity management.
SMBJ30CA-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):
- 12.4A
- Power - Peak Pulse:
- 600W
- 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 (SMBJ)
SMBJ30CA-E3/5B FAQ
1.How can I place an order for SMBJ30CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30CA-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 SMBJ30CA-E3/5B reliable?
The price and inventory of SMBJ30CA-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 SMBJ30CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ30CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30CA-E3/5B?
SMBJ30CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30CA-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 SMBJ30CA-E3/5B?
For technical support, including SMBJ30CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30CA-E3/5B requirements.
6.How does Aetrix verify that SMBJ30CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ30CA-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 SMBJ30CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ30CA-E3/5B?
All SMBJ30CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30CA-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 SMBJ30CA-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ30CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ30CA-E3/5B Tags
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Diodes Incorporated
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