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Vishay General Semiconductor - Diodes Division SMBJ51CD-M3/I
- Part No.:
- SMBJ51CD-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CD-M3/I.pdf
- Description:
- TVS DIODE 51VWM 81.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:10,941
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Product details
Overview
SMBJ51CD-M3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V standoff voltage (VWM), 57.6–61.8 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), clamping voltage of 81.2 V at 7.4 A, and operates across –55 °C to +150 °C junction temperature range - deployed on signal lines and power rails in industrial sensor interfaces.
For engineers reviewing the SMBJ51CD-M3/I datasheet, SMBJ51CD-M3/I pinout, SMBJ51CD-M3/I application, or SMBJ51CD-M3/I equivalent, key selection criteria include bidirectional clamping capability, ±3.5 % VBR tolerance, low leakage (<0.5 μA at VWM), MSL Level 1 moisture sensitivity, and halogen-free RoHS-compliant construction suitable for automated SMT assembly.
Technical Context
This device implements a silicon avalanche diode structure optimized for fast response (<1 ns) to ESD and surge transients, with symmetrical conduction in both polarities due to its bidirectional configuration. Its low incremental surge resistance ensures stable clamping under repetitive 10/1000 μs surges at 0.01 % duty cycle, while thermal resistance (RθJA = 125 °C/W on minimum pad layout) supports reliable operation without heatsinking in typical PCB environments.
The SMBJ51CD-M3/I meets UL 497B recognition (QVGQ2) for telecom and industrial protectors and complies with JESD201 Class 2 whisker resistance. Its matte tin-plated leads are solderable per J-STD-002 and JESD22-B102, and the molding compound satisfies UL 94 V-0 flammability rating - confirming suitability for safety-critical board-level protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum reverse working voltage before clamping begins; defines safe operating margin for 48 V nominal systems |
| VBR min/max | 57.6 V / 61.8 V at 1 mA - tight ±3.5 % tolerance ensures predictable turn-on across production lots |
| VC @ IPPM | 81.2 V at 7.4 A - clamping voltage limits downstream IC stress during 600 W transient events |
| PPPM | 600 W (10/1000 μs) - sustains high-energy surges common in industrial I/O and telecom line interfaces |
| ID @ VWM | <0.5 μA - negligible leakage preserves signal integrity and battery life in always-on circuits |
| TJ max | +150 °C - enables deployment in under-hood automotive modules or enclosed industrial enclosures |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with standard 0.220" × 0.130" land pattern and reflow profiles |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking - terminals are symmetrical and interchangeable. Case dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); cathode band absent per bidirectional design convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both) | Surge current path | Identical bidirectional conduction - either terminal serves as input/output for transient energy diversion |
| Case | Thermal path | Exposed copper pad area required for thermal dissipation; RθJA = 125 °C/W on minimum recommended layout |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| ±3.5 % VBR tolerance | Reduces design margin overhead and eliminates need for binning or post-layout voltage tuning |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-to-line, 2 Ω source impedance) without degradation |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking - simplifies SMT manufacturing logistics |
| Halogen-free & RoHS | Meets IPC-1752A material declaration requirements for green electronics compliance programs |
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 lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping element placed directly at connector entry point to shunt transients before reaching precision ADCs or isolated UART transceivers. Use Value: 81.2 V clamping voltage ensures downstream 3.3 V or 5 V logic remains below absolute maximum ratings during 1 kV/μs fast-rising transients. | Use Scenario: Shielding Ethernet PHY interface and POTS line drivers in VoIP gateways and DSLAM equipment against induced surges from nearby AC mains or telecom line faults. IC Role / Device Role / Timing Role: Bidirectional TVS placed differential-mode across twisted-pair lines to suppress common-mode and differential-mode transients simultaneously. Use Value: Symmetrical clamping prevents DC bias shift on AC-coupled data lines, preserving signal integrity without adding coupling capacitors. |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
Use Scenario: Safeguarding LIN bus transceivers and GPIOs in door module ECUs subjected to load dump and ISO 7637-2 pulse 5a/b transients. IC Role / Device Role / Timing Role: Secondary protection stage following primary LC filter, absorbing residual energy that passes through bulk filtering. Use Value: 150 °C max junction temperature allows placement near heat-generating power FETs without derating penalties. | Use Scenario: Protecting microcontroller reset lines and optocoupler inputs in washing machine control boards exposed to relay coil flyback and brush-commutator noise. IC Role / Device Role / Timing Role: Low-leakage (0.5 μA) TVS placed on high-impedance reset circuitry to avoid false triggering while maintaining fast response. Use Value: Tight VBR tolerance ensures consistent trip point across temperature and aging, eliminating field failures from marginal clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA-E3/52 (Vishay) | Same electrical specs but M3 suffix omitted; meets JESD201 Class 1 (not Class 2) whisker resistance | Acceptable for non-automotive consumer products where whisker risk is lower | Select SMBJ51CD-M3/I when Class 2 whisker resistance and halogen-free compliance are mandatory |
| P6SMB51CA (ON Semiconductor) | Identical SMB package and 51 V bidirectional rating; 600 W PPPM; VBR 57.8–61.9 V; ID ≤ 1.0 μA | Valid alternative for legacy designs using ON Semi's P6SMB series; same PCB footprint | Choose SMBJ51CD-M3/I for tighter VBR tolerance (±3.5 % vs ±5 %) and lower leakage (0.5 μA vs 1.0 μA) |
Compared with SMBJ51CA-E3/52 and P6SMB51CA, the SMBJ51CD-M3/I delivers superior process control via ±3.5 % VBR tolerance and Class 2 whisker resistance - critical for long-lifecycle industrial deployments where parameter drift and intermetallic growth must be minimized.
Availability
SMBJ51CD-M3/I 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.
Supply support for SMBJ51CD-M3/I 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 and performance in harsh environments.
The SMBJ series was engineered specifically for high-reliability board-level transient suppression in industrial, telecom, and automotive applications - balancing surge robustness, thermal stability, and manufacturability in surface-mount packages.
FAQ
What does the "CD" suffix indicate in SMBJ51CD-M3/I?
The "CD" suffix in SMBJ51CD-M3/I denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both forward and reverse directions. This eliminates polarity concerns during PCB layout and enables use on AC-coupled or floating signal paths - unlike unidirectional "D" variants which require correct cathode orientation. The SMBJ51CD-M3/I is functionally identical to SMBJ51CA but conforms to Vishay's M3 industrial-grade specification.
Does SMBJ51CD-M3/I meet UL recognition standards?
Yes, SMBJ51CD-M3/I is Underwriters Laboratories (UL) recognized under file E136766 for both unidirectional and bidirectional configurations, compliant with UL 497B for telecommunications protectors. This certification confirms its suitability for safety-critical surge protection in telecom infrastructure, industrial control panels, and medical auxiliary equipment where regulatory approval is mandatory.
What is the maximum clamping voltage of SMBJ51CD-M3/I and how is it measured?
The maximum clamping voltage (VC) of SMBJ51CD-M3/I is 81.2 V, measured at a peak pulse current (IPPM) of 7.4 A using a standardized 10/1000 μs double-exponential waveform. This value represents the upper limit of voltage seen by protected circuitry during worst-case surge events and is guaranteed across the full operating temperature range (–55 °C to +150 °C), ensuring consistent protection margin in demanding environments.
Can SMBJ51CD-M3/I be used in place of a unidirectional SMBJ51D-M3/I?
No - SMBJ51CD-M3/I is bidirectional and lacks polarity marking, while SMBJ51D-M3/I is unidirectional with a cathode band. Substituting them requires verifying circuit topology: bidirectional use is valid only where both polarities of transient energy must be suppressed (e.g., AC lines, differential buses). Using SMBJ51CD-M3/I in a unidirectional application may increase leakage or reduce effective VWM margin; always validate with actual surge testing.
What does the "M3" suffix signify in SMBJ51CD-M3/I?
The "M3" suffix in SMBJ51CD-M3/I indicates halogen-free, RoHS-compliant construction, industrial-grade qualification, and compliance with JESD201 Class 2 whisker resistance testing. It also specifies matte tin-plated terminations solderable per J-STD-002 and JESD22-B102. These attributes make SMBJ51CD-M3/I suitable for high-reliability applications including automotive sub-systems and industrial automation where long-term interconnect integrity is critical.
SMBJ51CD-M3/I 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):
- 57.6V
- Voltage - Clamping (Max) @ Ipp:
- 81.2V
- Current - Peak Pulse (10/1000µs):
- 7.4A
- 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)
SMBJ51CD-M3/I FAQ
1.How can I place an order for SMBJ51CD-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CD-M3/I 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 SMBJ51CD-M3/I reliable?
The price and inventory of SMBJ51CD-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51CD-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ51CD-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CD-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CD-M3/I?
SMBJ51CD-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CD-M3/I 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 SMBJ51CD-M3/I?
For technical support, including SMBJ51CD-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CD-M3/I requirements.
6.How does Aetrix verify that SMBJ51CD-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ51CD-M3/I 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 SMBJ51CD-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ51CD-M3/I?
All SMBJ51CD-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CD-M3/I, 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 SMBJ51CD-M3/I part is unused and in its original packaging.
Return procedure for SMBJ51CD-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CD-M3/I Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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