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Vishay General Semiconductor - Diodes Division SMBJ30CA-E3/52
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- Part No.:
- SMBJ30CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30CA-E3/52.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:81,527
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Product details
Overview
SMBJ30CA-E3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 30 V stand-off voltage (VWM), 48.4 V maximum clamping voltage (VC) at 12.4 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), commonly deployed on power rails and signal lines in industrial sensor interfaces.
For engineers reviewing the SMBJ30CA-E3/52 datasheet, SMBJ30CA-E3/52 pinout, SMBJ30CA-E3/52 application, or SMBJ30CA-E3/52 equivalent, key selection criteria include bidirectional clamping symmetry, low incremental surge resistance, MSL Level 1 moisture sensitivity, and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified between 33.3 V and 36.8 V at 1.0 mA test current. Its clamping behavior is defined under standardized 10/1000 µs surge conditions, delivering consistent voltage limiting during transient events induced by inductive switching or ESD.
The device uses a glass-passivated silicon junction and exhibits a temperature coefficient of VBR of +0.099 %/°C. Thermal resistance from junction to ambient is 100 °C/W (on recommended pad layout), and it supports continuous power dissipation of 5.0 W at 50 °C ambient with infinite heatsink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 30 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Min/Max) | 33.3 V / 36.8 V at 1.0 mA - Confirmed bidirectional breakdown range; ensures symmetrical triggering in either polarity |
| VC @ IPPM | 48.4 V at 12.4 A - Clamped voltage during 600 W surge; determines protected circuit's maximum transient stress level |
| PPPM | 600 W (10/1000 µs) - Peak surge power handling capacity; validates suitability for IEC 61000-4-5 Level 3/4 surges |
| IPPM | 12.4 A - Peak pulse current capability; sets minimum trace width and PCB copper area requirements (5.0 mm × 5.0 mm pads) |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in industrial environments up to 85 °C ambient with derating |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 2.20 mm min. cathode band width; compatible with J-STD-020 reflow profiles |
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, rated MSL Level 1 (peak reflow ≤ 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Acts as cathode during positive transients; forms symmetrical clamping node with cathode terminal |
| Cathode | Transient return path (bidirectional) | Acts as anode during negative transients; completes bidirectional clamping loop with anode terminal |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC performance in both directions - eliminates need for polarity-aware placement in AC-coupled or floating signal paths |
| 600 W peak pulse power | Validated under 10/1000 µs waveform - meets IEC 61000-4-5 surge immunity requirements for industrial equipment power inputs |
| Low clamping ratio (VC/VWM = 1.61) | 48.4 V clamp at 30 V stand-off - minimizes voltage overshoot on protected ICs such as RS-485 transceivers or microcontroller I/O |
| MSL Level 1 rating | Unlimited floor life at ≤ 30 °C/60 % RH - enables direct use from reel without baking, reducing SMT line downtime |
| Glass-passivated junction | Enhanced reliability vs. epoxy-passivated alternatives - improves long-term stability under thermal cycling and humidity exposure |
Applications
| Industrial Sensor Signal Protection | RS-485 Bus Line Protection |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) and digital sensor interfaces (I²C, SPI) from ESD and load-switching transients in factory automation systems. IC Role / Device Role: Bidirectional voltage clamp placed directly at connector entry point, shunting surge energy to ground before reaching precision ADC or MCU GPIO. Use Value: Limits transient voltage to ≤48.4 V, preventing latch-up or gate oxide damage in 3.3 V/5 V sensor interface ICs while maintaining signal integrity below 30 V normal operation. |
Use Scenario: Safeguarding differential RS-485 transceiver terminals (A/B lines) against lightning-induced surges and ground potential differences in building control networks. IC Role / Device Role: Symmetrical TVS pair (one per line) referenced to local ground, absorbing common-mode and differential-mode transients without disrupting DC bias. Use Value: Maintains bus functionality during 1 kV/0.5 kA surges per IEC 61000-4-5, with clamping that preserves receiver input thresholds and avoids false logic transitions. |
| DC Power Rail Protection | Automotive Body Control Module Inputs |
|
Use Scenario: Guarding 24 V supply rails feeding PLC I/O modules, motor drivers, and relay coils against inductive kickback and hot-swap transients. IC Role / Device Role: Parallel-connected TVS across rail-to-ground, activated only during overvoltage events exceeding 30 V, with minimal standby leakage (<1.0 µA). Use Value: Absorbs up to 600 W surge energy without failure, enabling compliance with ISO 7637-2 Pulse 1/2a/3a immunity testing for industrial power supplies. |
Use Scenario: Protecting low-voltage sensor inputs (e.g., door switch, seat occupancy) in automotive BCMs exposed to battery dump and load-dump transients. IC Role / Device Role: AEC-Q101 qualified variant (SMBJ30CAHE3) used on 12 V subsystem rails; this commercial-grade SMBJ30CA-E3/52 serves as cost-optimized alternative for non-safety-critical functions. Use Value: Delivers identical clamping performance (48.4 V @ 12.4 A) and thermal robustness (TJ max. = +150 °C) required for under-hood temperature cycling, though not certified for AEC-Q101. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA-M3/52 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package | No difference in circuit performance; selected where halogen-free BOM compliance is mandated | Choose when environmental compliance requires halogen-free materials without altering layout or design-in validation |
| SAC30CA | Same VWM (30 V) and VC (48.4 V), but in smaller SOD-123FL package (lower IPPM = 9.5 A, PPPM = 400 W) | Lower surge rating limits use to lower-energy transients (e.g., ESD-only); unsuitable for IEC 61000-4-5 line surges | Select only for space-constrained designs where peak surge energy is <400 W and PCB layout cannot accommodate SMB footprint |
Compared with SMBJ30CA-E3/52, the M3/52 offers identical protection performance with halogen-free construction, while SAC30CA trades 33 % lower surge capacity for 40 % smaller footprint-making the former a drop-in material substitute and the latter a layout-driven compromise.
Availability
SMBJ30CA-E3/52 is available at Aetrix Electronics and suitable for industrial sensor interfaces, RS-485 communication lines, and 24 V DC power rail protection requiring stable component supply, full traceability, and volume-ready packaging.
Supply support for SMBJ30CA-E3/52 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, power efficiency, and automotive-grade qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting industrial automation, telecom infrastructure, and automotive subsystems where robustness and repeatable clamping are critical.
FAQ
What is the maximum clamping voltage of SMBJ30CA-E3/52 under standard surge conditions?
The SMBJ30CA-E3/52 has a maximum clamping voltage (VC) of 48.4 V when subjected to its rated peak pulse current of 12.4 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ30CA-E3/52 maintains this clamping performance bidirectionally, ensuring consistent protection regardless of surge polarity.
Is SMBJ30CA-E3/52 suitable for automotive applications requiring AEC-Q101 qualification?
No, SMBJ30CA-E3/52 is the commercial-grade RoHS-compliant version and is not AEC-Q101 qualified. For automotive use, Vishay offers the SMBJ30CAHE3 variant (with HE3 suffix), which carries full AEC-Q101 qualification and identical electrical specifications. The SMBJ30CA-E3/52 remains appropriate for industrial, telecom, and consumer applications where automotive certification is not required.
What is the thermal resistance and power derating behavior of SMBJ30CA-E3/52?
The SMBJ30CA-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the recommended 5.0 mm × 5.0 mm copper pads. Its steady-state power dissipation (PD) is rated at 5.0 W at TA = 50 °C with infinite heatsink; above 25 °C ambient, power must be linearly derated per Figure 2 in the datasheet. The SMBJ30CA-E3/52 supports continuous operation up to +150 °C junction temperature.
How does the bidirectional nature of SMBJ30CA-E3/52 affect PCB layout and placement?
The SMBJ30CA-E3/52 has no polarity marking and operates identically in both directions, eliminating orientation constraints during placement. Unlike unidirectional TVS diodes, it requires no cathode-band alignment-reducing SMT programming complexity and eliminating risk of reverse installation. This symmetry makes the SMBJ30CA-E3/52 ideal for protecting AC-coupled signals, floating buses, or dual-rail systems where voltage polarity reversal is possible.
What are the moisture sensitivity and reflow profile requirements for SMBJ30CA-E3/52?
SMBJ30CA-E3/52 is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30 °C/60 % RH and requires no baking prior to reflow. Its matte tin-plated leads are compatible with standard lead-free reflow profiles, with a maximum peak temperature of 260 °C. The SMBJ30CA-E3/52 is supplied in 7" tape-and-reel (52) format, optimized for high-speed pick-and-place equipment.
SMBJ30CA-E3/52 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-E3/52 FAQ
1.How can I place an order for SMBJ30CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30CA-E3/52 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-E3/52 reliable?
The price and inventory of SMBJ30CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ30CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ30CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30CA-E3/52?
SMBJ30CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30CA-E3/52 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-E3/52?
For technical support, including SMBJ30CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30CA-E3/52 requirements.
6.How does Aetrix verify that SMBJ30CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ30CA-E3/52 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-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ30CA-E3/52?
All SMBJ30CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30CA-E3/52, 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-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ30CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ30CA-E3/52 Tags
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Diodes Incorporated
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