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Vishay General Semiconductor - Diodes Division SMBJ51CAHM3_B/I
- Part No.:
- SMBJ51CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CAHM3_B/I.pdf
- Description:
- 600W,51V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,519
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Product details
Overview
SMBJ51CAHM3_B/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V standoff voltage (VWM), 600 W peak pulse power (10/1000 µs), clamping voltage of 82.4 V at 7.3 A, and operates across -55 °C to +150 °C - deployed in industrial sensor signal lines and telecom interface protection.
For engineers reviewing the SMBJ51CAHM3_B/I datasheet, SMBJ51CAHM3_B/I pinout, SMBJ51CAHM3_B/I application, or SMBJ51CAHM3_B/I equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification status, and real-world use cases in automotive-grade power rail and data line surge suppression.
Technical Context
This device implements a glass-passivated silicon avalanche junction optimized for fast response (<1 ps) to ESD and lightning-induced transients. Its bidirectional architecture enables symmetrical clamping in both polarities without external polarity management, supporting protection of AC-coupled or differential interfaces like RS-485 or CAN bus physical layers.
The SMBJ51CAHM3_B/I complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) standards when mounted per recommended 5.0 mm × 5.0 mm copper pad layout. Its halogen-free, RoHS-compliant HM3 suffix confirms JESD201 Class 2 whisker resistance and MSL Level 1 moisture sensitivity rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below system rail. |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - breakdown voltage range ensures reliable turn-on within specification tolerance under defined test current. |
| VC @ IPPM | 82.4 V at 7.3 A - clamping voltage during 600 W transient; determines maximum stress imposed on protected downstream ICs. |
| PPPM | 600 W - peak pulse power handling with 10/1000 µs waveform; supports repetitive surge events at 0.01 % duty cycle. |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance on standard 0.2" × 0.2" pads; informs derating above 25 °C ambient. |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive or high-temperature industrial enclosures. |
| Package | SMB (DO-214AA) - surface-mount outline with 2.20 mm × 4.57 mm footprint; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminal structure with two leads (anode/cathode interchangeable).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode / Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; no fixed polarity required in circuit layout. |
| Lead 2 | Anode / Cathode (bidirectional) | Paired terminal completing the symmetrical TVS path; enables clamping of positive and negative transients identically. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports high-energy surge events common in industrial motor drives and telecom line interfaces without failure. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including infotainment power rails and body control module sensor inputs. |
| Halogen-free, RoHS-compliant | Meets environmental compliance requirements for EU, China RoHS, and JEITA-MITI standards in final product assembly. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow without moisture-related popcorn failure or delamination risk. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD >15 kV), improving protection margin for sub-5 V logic. |
Applications
| Industrial Sensor Signal Protection | Automotive Body Control Module Inputs |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in factory automation PLCs exposed to relay coil flyback and EFT noise. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and ground to clamp ±1 kV surges before reaching ADC input or op-amp buffer. Use Value: Prevents sensor offset drift and latch-up by limiting transient voltage to ≤82.4 V while maintaining 51 V DC signal integrity. |
Use Scenario: Safeguarding LIN bus inputs in door module ECUs subjected to load dump and jump-start transients. IC Role / Device Role / Timing Role: Parallel-connected TVS on LIN data line to absorb 10/1000 µs surges up to 600 W without disrupting 19.2 kbps communication timing. Use Value: Ensures uninterrupted LIN frame transmission during battery voltage spikes up to 35 V, meeting ISO 16750-2 pulse 5a requirements. |
| Telecom Ethernet PHY Interface | Power Supply Rail Clamp |
|
Use Scenario: Shielding 10/100BASE-TX transformer-coupled pairs from induced lightning surges in outdoor network switches. IC Role / Device Role / Timing Role: Bidirectional TVS installed across differential pair pins to symmetrically suppress common-mode transients without skewing signal edges. Use Value: Maintains <1 ns jitter impact on 100 Mbps signals while surviving IEC 61000-4-5 Level 4 (4 kV) surge tests. |
Use Scenario: Clamping 12 V DC input rails in embedded gateways against inductive switching spikes from solenoid drivers. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA at 51 V) TVS shunting transients directly to ground, minimizing standby current drain. Use Value: Limits rail overshoot to <83 V during 100 A/8.3 ms surges, preventing damage to downstream LDOs and microcontrollers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CAHE3_B/I | RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker resistance certification. | Suitable for commercial-grade industrial equipment where halogen content and whisker reliability are non-critical. | Select when cost sensitivity outweighs automotive or long-life reliability requirements. |
| SMAJ51CAHM3_A/H | Lower 400 W PPPM; SMA package (smaller footprint, higher RθJA = 140 °C/W). | Better suited for space-constrained consumer electronics with lower surge exposure profiles. | Choose only if board area is constrained and peak surge energy remains ≤400 W. |
Compared with SMBJ51CAHM3_B/I, the HE3 variant trades halogen-free construction and whisker resistance for lower cost, while the SMAJ51CAHM3_A/H reduces surge capacity and thermal performance to fit tighter layouts - neither offers drop-in replacement due to differing power ratings and thermal behavior.
Availability
SMBJ51CAHM3_B/I is available at Aetrix Electronics and suitable for industrial sensor protection, automotive body electronics, telecom interface hardening, and DC power rail clamping requiring stable component supply across extended production lifecycles.
Supply support for SMBJ51CAHM3_B/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 application-specific validation.
The SMBJ series targets high-reliability transient suppression in harsh environments, with design focus on automotive AEC-Q101 compliance, industrial surge immunity, and manufacturability in high-volume SMT assembly.
FAQ
What is the clamping voltage of SMBJ51CAHM3_B/I at its rated peak pulse current?
The SMBJ51CAHM3_B/I has a maximum clamping voltage (VC) of 82.4 V at its specified peak pulse current (IPPM) of 7.3 A, measured using the standardized 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-power transient event and is critical for ensuring downstream components remain within their absolute maximum ratings. The SMBJ51CAHM3_B/I maintains this clamping performance across its full operating temperature range.
Is SMBJ51CAHM3_B/I suitable for automotive applications?
Yes, SMBJ51CAHM3_B/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's official datasheet (Document Number: 88392). This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and high-temperature operating life - making SMBJ51CAHM3_B/I appropriate for under-hood and cabin-mounted automotive modules including body control units, lighting drivers, and sensor interfaces.
How does the bidirectional configuration of SMBJ51CAHM3_B/I affect PCB layout?
The bidirectional configuration of SMBJ51CAHM3_B/I eliminates polarity marking and allows placement across any two nodes requiring symmetrical overvoltage protection - such as differential signal pairs or AC-coupled lines. Unlike unidirectional TVS diodes, SMBJ51CAHM3_B/I requires no orientation check during placement, reducing assembly errors and enabling simplified routing in balanced interfaces like RS-422 or isolated CAN transceivers.
What is the maximum reverse leakage current for SMBJ51CAHM3_B/I at its working voltage?
At its rated standoff voltage (VWM) of 51 V and ambient temperature of 25 °C, the SMBJ51CAHM3_B/I exhibits a maximum reverse leakage current (ID) of 1.0 µA. This low leakage ensures minimal power loss in always-on systems and avoids interference with high-impedance sensor bias networks or precision reference circuits - a key advantage over higher-leakage alternatives in battery-powered or low-quiescent-current designs.
Does SMBJ51CAHM3_B/I meet UL recognition requirements?
Yes, SMBJ51CAHM3_B/I carries Underwriters Laboratories recognition under file number E136766 for both unidirectional and bidirectional configurations, compliant with UL 497B for signal line protectors. This certification validates its safety performance in end-equipment installations requiring UL listing, including industrial control panels, telecom infrastructure, and building automation systems where third-party safety approval is mandatory.
SMBJ51CAHM3_B/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):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ51CAHM3_B/I FAQ
1.How can I place an order for SMBJ51CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CAHM3_B/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 SMBJ51CAHM3_B/I reliable?
The price and inventory of SMBJ51CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ51CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CAHM3_B/I?
SMBJ51CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CAHM3_B/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 SMBJ51CAHM3_B/I?
For technical support, including SMBJ51CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ51CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ51CAHM3_B/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 SMBJ51CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ51CAHM3_B/I?
All SMBJ51CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CAHM3_B/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 SMBJ51CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ51CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CAHM3_B/I Tags
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