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Vishay General Semiconductor - Diodes Division SMBJ51CA-E3/52
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- Part No.:
- SMBJ51CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CA-E3/52.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:833
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Product details
Overview
SMBJ51CA-E3/52 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 and power lines. It features a 51 V stand-off voltage (VWM), 600 W peak pulse power (10/1000 µs), 82.4 V maximum clamping voltage (VC) at 7.3 A peak pulse current, and operates across -55 °C to +150 °C junction temperature range - used in industrial sensor interface protection and telecom line surge suppression.
For engineers reviewing the SMBJ51CA-E3/52 datasheet, SMBJ51CA-E3/52 pinout, SMBJ51CA-E3/52 application, or SMBJ51CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.62), JEDEC-compliant SMB package footprint, and AEC-Q101 qualification eligibility via HE3/HM3 variants - critical for automotive-grade transient immunity design.
Technical Context
This bidirectional TVS diode uses a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its symmetrical breakdown behavior ensures identical clamping in both polarities, with VBR min/max of 56.7 V / 62.7 V at 1 mA test current and temperature coefficient of 0.104 %/°C.
The device complies with ANSI/IEEE C62.35 surge standards and meets UL 497B recognition (QVGQ2) for protector classification. Thermal resistance is 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, enabling reliable operation under repetitive 0.01% duty-cycle transients without derating below 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe signal swing margin for protected lines. |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - Breakdown threshold range; ensures consistent turn-on across production lot and temperature. |
| VC @ IPPM | 82.4 V at 7.3 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling per single transient; supports robust protection against IEC 61000-4-5 Level 4 surges. |
| IPPM | 7.3 A - Peak pulse current corresponding to VC; defines minimum surge current the device can safely divert. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive or high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Standardized 2-pin SMD outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated placement. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Cathode/anode terminals are functionally symmetric; both leads serve as interchangeable surge-current paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current entry (negative polarity) | Accepts transient energy during negative excursions; forms symmetrical clamping path with cathode. |
| Cathode | Surge current entry (positive polarity) | Accepts transient energy during positive excursions; completes bidirectional clamping loop with anode. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 4 kV surge testing without degradation when mounted per recommended pad layout. |
| Bidirectional clamping symmetry | Identical VBR and VC characteristics in both directions eliminate need for polarity-aware PCB routing. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio suppressors like SMAJ series. |
| MSL Level 1 (J-STD-020) | Enables lead-free reflow soldering at 260 °C peak without moisture-induced popcorning or delamination. |
| AEC-Q101 qualification option | HE3/HM3 suffix variants meet automotive reliability requirements for engine control, ADAS, and infotainment modules. |
Applications
| Industrial Sensor Interface Protection | Telecom Line Surge Suppression |
|---|---|
|
Use Scenario: Protecting RS-485 transceivers and analog sensor outputs (e.g., 4–20 mA loops) from ESD and lightning-induced surges in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential signal pairs or supply rails to limit transient overvoltage. Use Value: Prevents latch-up or permanent damage to precision op-amps and communication ICs by limiting excursion to ≤82.4 V during 10/1000 µs surges. |
Use Scenario: Shielding Ethernet PHY interfaces and DSL line drivers from induced surges in outdoor telecom cabinets and base station equipment. IC Role / Device Role / Timing Role: Primary-level transient suppressor installed at connector entry point to shunt surge energy before reaching isolation transformers or PHY ICs. Use Value: Maintains signal integrity by clamping common-mode transients up to 600 W while preserving <1 pF junction capacitance at zero bias. |
| Automotive Body Control Module (BCM) | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Safeguarding LIN bus nodes and LED driver circuits in door modules and lighting control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Secondary-level TVS deployed after primary LC filtering to absorb residual fast-edge transients (<100 ns rise time). Use Value: Enables AEC-Q101-compliant designs using HE3 suffix variant, ensuring >1000-hour HTOL stability at 150 °C junction temperature. |
Use Scenario: Protecting microcontroller I/O pins and gate drivers in washing machine motor control boards subjected to relay coil flyback and EMI coupling. IC Role / Device Role / Timing Role: Localized clamping element placed adjacent to MOSFET gates or MCU reset lines to suppress sub-microsecond spikes. Use Value: Reduces system-level failure rate by limiting gate-source overvoltage to <82.4 V during 100 A inductive kick events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51CA-E3/61 | Lower PPPM (400 W), larger SMA package (DO-214AC), higher VC (93.6 V at 4.3 A) | Less robust for high-energy surges; suitable only where board space allows larger footprint and lower clamping performance is acceptable. | Select when cost sensitivity outweighs surge margin requirements and PCB real estate permits SMA footprint. |
| SMCJ51CA-E3/73 | Higher PPPM (1500 W), larger SMC package (DO-214AB), same VWM/VBR but lower VC (87.1 V at 17.3 A) | Over-spec'd for typical 600 W needs; requires larger pad layout and may increase parasitic inductance in high-frequency paths. | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 or when long-term reliability under repeated transients is critical. |
Compared with SMAJ51CA-E3/61 and SMCJ51CA-E3/73, SMBJ51CA-E3/52 delivers optimal balance of surge rating, compact SMB footprint, and clamping voltage - making it the preferred choice for space-constrained industrial and telecom designs requiring verified 600 W transient immunity.
Availability
SMBJ51CA-E3/52 is available at Aetrix Electronics and suitable for industrial sensor interface protection, telecom line surge suppression, automotive body control modules, and consumer appliance motor drive protection requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMBJ51CA-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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-reliability surface-mount transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and communications infrastructure where compact size and repeatable clamping are essential.
FAQ
What is the clamping voltage of SMBJ51CA-E3/52 at its rated peak pulse current?
The SMBJ51CA-E3/52 has a maximum clamping voltage (VC) of 82.4 V at 7.3 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ51CA-E3/52 maintains this clamping performance across its full operating temperature range.
Is SMBJ51CA-E3/52 unidirectional or bidirectional, and how does that affect PCB layout?
SMBJ51CA-E3/52 is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without polarity dependence. Unlike unidirectional variants (e.g., SMBJ51A), it carries no cathode band marking and can be placed in either orientation on the PCB - simplifying layout, reducing BOM complexity, and eliminating risk of reverse installation. The SMBJ51CA-E3/52 achieves this via matched junction characteristics in both directions.
Does SMBJ51CA-E3/52 meet automotive qualification standards?
The base SMBJ51CA-E3/52 is commercial-grade and RoHS-compliant, but not AEC-Q101 qualified. However, Vishay offers automotive-qualified versions under ordering codes SMBJ51CAHE3_X (RoHS + AEC-Q101) and SMBJ51CAHM3_X (halogen-free + RoHS + AEC-Q101), where "_X" denotes revision code (e.g., A, B). These variants undergo extended reliability testing including HTOL, TCT, and UHAST per AEC-Q101 Rev G, and are fully drop-in compatible with SMBJ51CA-E3/52 in SMB package.
What is the thermal resistance and maximum power dissipation of SMBJ51CA-E3/52?
SMBJ51CA-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per JEDEC standards. Its steady-state power dissipation (PD) is rated at 5.0 W at 50 °C ambient temperature. For non-repetitive surges, it handles 600 W peak pulse power (10/1000 µs) with 0.01% duty cycle - making SMBJ51CA-E3/52 suitable for intermittent transient suppression without thermal runaway.
How does the junction capacitance of SMBJ51CA-E3/52 impact high-speed signal lines?
The SMBJ51CA-E3/52 exhibits typical junction capacitance of <1.0 pF at zero bias (measured at 1 MHz), which minimizes signal distortion and insertion loss on high-speed interfaces such as USB 2.0, CAN FD, or RS-485. This ultra-low capacitance is achieved through optimized die geometry and ensures SMBJ51CA-E3/52 can be placed directly across differential pairs without degrading eye diagram integrity or increasing bit error rate in data transmission paths.
SMBJ51CA-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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- 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)
SMBJ51CA-E3/52 FAQ
1.How can I place an order for SMBJ51CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CA-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 SMBJ51CA-E3/52 reliable?
The price and inventory of SMBJ51CA-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 SMBJ51CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ51CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CA-E3/52?
SMBJ51CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CA-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 SMBJ51CA-E3/52?
For technical support, including SMBJ51CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CA-E3/52 requirements.
6.How does Aetrix verify that SMBJ51CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ51CA-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 SMBJ51CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ51CA-E3/52?
All SMBJ51CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CA-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 SMBJ51CA-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ51CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CA-E3/52 Tags
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