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Vishay General Semiconductor - Diodes Division SMBJ51CA-E3/5B
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- Part No.:
- SMBJ51CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CA-E3/5B.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,190
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Product details
Overview
SMBJ51CA-E3/5B from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features a 51 V stand-off voltage (VWM), 600 W peak pulse power (10/1000 µs), and clamps to ≤82.4 V at 7.3 A peak surge current - protecting MOSFETs, sensor interfaces, and industrial I/O circuits against ESD and inductive switching spikes.
For engineers reviewing the SMBJ51CA-E3/5B datasheet, SMBJ51CA-E3/5B pinout, SMBJ51CA-E3/5B application, or SMBJ51CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.62), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on consumer, telecom, and industrial PCBs.
Technical Context
This device operates as a voltage-clamped crowbar during transient events: when reverse (or forward, in bidirectional mode) voltage exceeds its breakdown threshold (VBR = 56.7–62.7 V), it switches from high-impedance to low-impedance state within <1 ps, diverting surge current away from protected circuitry. Its glass-passivated junction ensures stable leakage (<1.0 µA at 51 V) and repeatable breakdown behavior across temperature.
The SMBJ51CA-E3/5B is rated for repetitive 10/1000 µs surges at 0.01% duty cycle, with thermal resistance RθJA = 100 °C/W and maximum junction temperature of +150 °C. It meets UL 497B recognition (QVGQ2) and is RoHS-compliant per base P/N-E3 suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 48 V DC systems. |
| VBR @ IT = 1 mA | 56.7–62.7 V - Breakdown voltage range confirming reliable turn-on under transient stress without premature conduction. |
| VC @ IPPM = 7.3 A | ≤82.4 V - Clamped voltage during 600 W surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling (10/1000 µs waveform); supports protection against IEC 61000-4-5 Level 4 surges. |
| IPPM | 7.3 A - Peak surge current capability at VC; sets minimum trace width and layout robustness requirements. |
| Junction Temp. Range | −55 °C to +150 °C - Enables deployment in automotive under-hood or industrial ambient environments. |
| Package | SMB (DO-214AA) - Standardized 2-pin SMD footprint with 5.21 mm × 4.06 mm body; 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path (bidirectional) | Provides symmetrical conduction in both directions; connects to protected line or ground reference depending on layout. |
| Cathode | Transient current return path (bidirectional) | Functionally identical to Anode in CA-suffix devices; no cathode band marking distinguishes bidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints. |
| 600 W peak pulse power (10/1000 µs) | Meets IEC 61000-4-5 surge immunity requirements for industrial and telecom equipment. |
| Low clamping ratio (VC/VWM ≈ 1.62) | Minimizes overvoltage exposure to downstream components compared to higher-ratio TVS devices. |
| MSL Level 1 rating (260 °C peak) | Allows unlimited floor life and standard reflow without baking; simplifies manufacturing logistics. |
| UL 497B recognized (QVGQ2) | Validates compliance for telecom and data-line surge protection in certified end equipment. |
Applications
| Industrial Sensor Interfaces | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive kickback in factory automation PLCs. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at connector entry point to shunt transients before reaching ADC front-end or signal conditioner. Use Value: Prevents latch-up or permanent damage to precision op-amps and SAR ADCs by limiting input voltage to ≤82.4 V during 600 W surges. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller GPIOs against battery reverse connection and alternator load dump in BCM subassemblies. IC Role / Device Role / Timing Role: Bidirectional transient suppressor bridging LIN line to chassis ground, absorbing ±100 V/500 ms pulses per ISO 7637-2. Use Value: Maintains communication integrity during vehicle-level EMC testing by clamping without forward conduction biasing issues. |
| Telecom Data Line Protection | Consumer USB Power Delivery Ports |
|
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs from lightning-induced surges on outdoor cabling in access gateways. IC Role / Device Role / Timing Role: Primary line-side TVS on differential pairs, coordinated with GDT or MOV secondary stages for multi-level protection. Use Value: Limits common-mode voltage excursion to <85 V, preserving isolation barrier integrity and preventing transceiver latch-up. |
Use Scenario: Guarding USB-C CC and VBUS lines against ESD (IEC 61000-4-2 ±15 kV contact) and hot-plug voltage overshoot in portable chargers. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp on VBUS rail, placed upstream of buck converter input to absorb 30 A ESD events. Use Value: Eliminates need for separate unidirectional devices on dual-role power paths, reducing BOM count and board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU public infrastructure). | Choose when environmental compliance requires halogen-free molding compound without altering design or layout. |
| SMCJ51CA-E3/2A | Same VWM/VC but in larger SMC (DO-214AB) package; 1500 W PPPM, RθJA = 35 °C/W. | Higher power handling enables longer surge duration tolerance; requires larger PCB pad area and different thermal relief. | Select when system-level surge tests exceed 600 W or when extended thermal dissipation is required in high-ambient environments. |
Compared with SMBJ51CA-E3/5B, the M3/5B offers identical protection performance with halogen-free construction, while the SMCJ51CA-E3/2A trades compact size for 2.5× higher surge capacity and lower thermal resistance - guiding selection based on space constraints versus energy absorption needs.
Availability
SMBJ51CA-E3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and telecom data line protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ51CA-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, TVS devices, and power MOSFETs with emphasis on reliability and application-specific performance.
The SMBJ series was developed for high-reliability, surface-mount transient suppression in space-constrained industrial and automotive systems - prioritizing fast response, low clamping, and robust surge endurance in standardized packages.
FAQ
What is the breakdown voltage range of SMBJ51CA-E3/5B?
The SMBJ51CA-E3/5B has a specified breakdown voltage (VBR) range of 56.7 V to 62.7 V at 1 mA test current, measured per ANSI/IEEE C62.35. This ensures consistent turn-on behavior across production lots and temperature, critical for predictable clamping in 48 V nominal systems. The SMBJ51CA-E3/5B maintains this specification under standard JEDEC test conditions and is validated per Vishay Document Number 88392.
Is SMBJ51CA-E3/5B suitable for automotive applications?
The SMBJ51CA-E3/5B itself is commercial-grade (E3 suffix), not AEC-Q101 qualified. However, its automotive-qualified counterpart - SMBJ51CAHE3_B/I - shares identical electrical characteristics and SMB package. For automotive use, specify the HE3 suffix version; the SMBJ51CA-E3/5B remains appropriate for non-automotive industrial or telecom designs requiring the same clamping performance.
How does the bidirectional nature of SMBJ51CA-E3/5B affect PCB layout?
The SMBJ51CA-E3/5B has no polarity marking and conducts identically in both directions, eliminating orientation concerns during placement. Layout requires symmetric trace routing to both terminals, equal copper pour area per pad (per datasheet note: 0.2" × 0.2" pads), and avoidance of stubs that could increase inductance. This symmetry simplifies routing on differential or floating lines, unlike unidirectional TVS diodes which require strict cathode alignment.
What is the maximum clamping voltage for SMBJ51CA-E3/5B at rated surge current?
At its rated peak pulse current of 7.3 A (10/1000 µs waveform), the SMBJ51CA-E3/5B clamps to a maximum of 82.4 V. This value is guaranteed across temperature and process variation per Vishay's characterization in Document 88392. It defines the upper voltage limit imposed on protected circuitry during worst-case surge events and must be verified against downstream component absolute maximum ratings.
Does SMBJ51CA-E3/5B meet any safety certifications?
Yes - the SMBJ51CA-E3/5B carries Underwriters Laboratories (UL) recognition under standard UL 497B (file E136766) for both unidirectional and bidirectional protectors. This certification validates its suitability for use in telecom and data-line surge protection applications where regulatory approval is required. The UL mark applies to the device itself, not just the package or material set.
SMBJ51CA-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):
- 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-E3/5B FAQ
1.How can I place an order for SMBJ51CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CA-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 SMBJ51CA-E3/5B reliable?
The price and inventory of SMBJ51CA-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 SMBJ51CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ51CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CA-E3/5B?
SMBJ51CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CA-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 SMBJ51CA-E3/5B?
For technical support, including SMBJ51CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CA-E3/5B requirements.
6.How does Aetrix verify that SMBJ51CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ51CA-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 SMBJ51CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ51CA-E3/5B?
All SMBJ51CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CA-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 SMBJ51CA-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ51CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CA-E3/5B Tags
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