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Vishay General Semiconductor - Diodes Division SMBJ51CAHE3_A/I
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- Part No.:
- SMBJ51CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CAHE3_A/I.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,084
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Product details
Overview
SMBJ51CAHE3_A/I 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 standoff voltage (VWM), 600 W peak pulse power (10/1000 µs), clamping voltage of 82.4 V at 7.3 A peak pulse current, and operates across –55 °C to +150 °C junction temperature - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMBJ51CAHE3_A/I datasheet, SMBJ51CAHE3_A/I pinout, SMBJ51CAHE3_A/I application, or SMBJ51CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM ≈ 1.62), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on PCBs with 5.0 mm × 5.0 mm copper pads.
Technical Context
This device implements a glass-passivated silicon avalanche junction optimized for fast transient response (<1 ps typical) and low incremental surge resistance. Its bidirectional architecture enables symmetrical clamping in AC-coupled or floating signal paths without polarity constraints.
It delivers 600 W peak pulse power under standardized 10/1000 µs waveform conditions, with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W - enabling reliable operation up to 150 °C junction temperature when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 51 V - maximum continuous reverse voltage before clamping begins; defines operating margin below breakdown. |
| VBR (Breakdown Voltage) | 56.7–62.7 V at 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 82.4 V at 7.3 A IPPM - peak voltage seen by protected circuit during 600 W transient; critical for downstream IC survival. |
| PPPM (Peak Pulse Power) | 600 W (10/1000 µs) - energy-handling capacity for short-duration surges like ESD or inductive switching spikes. |
| IPPM (Peak Pulse Current) | 7.3 A - maximum non-repetitive surge current the device can safely divert without degradation. |
| TJmax | 150 °C - maximum junction temperature; supports under-hood automotive and high-ambient industrial use. |
| MSL Level | Level 1 (J-STD-020) - no floor life limitation; suitable for standard reflow without dry-pack requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Either terminal serves as input/output for bidirectional clamping; no cathode band or polarity identifier required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces. |
| 600 W peak pulse power (10/1000 µs) | Robust protection against ISO 7637-2 Load Dump and IEC 61000-4-5 surge events in industrial systems. |
| Low clamping ratio (VC/VWM ≈ 1.62) | Minimizes overvoltage stress on downstream MOSFETs or microcontrollers during transient suppression. |
| Glass-passivated junction | Ensures stable breakdown characteristics and long-term reliability under repeated surge stress. |
| Matte tin-plated leads | Complies with J-STD-002 and JESD 22-B102; supports lead-free reflow and eliminates whisker risk (JESD 201 Class 2). |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt transients before reaching signal conditioning circuitry. Use Value: Withstands 600 W surges while limiting clamped voltage to 82.4 V - preserving integrity of 5 V or 3.3 V interface ICs rated ≤100 V absolute max. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on 24 V DC input lines, activated within picoseconds to prevent latch-up in optocouplers and level shifters. Use Value: 51 V VWM matches common 24 V system derating margin; 150 °C TJmax ensures operation inside sealed control cabinets. |
| Telecom Line Interface Protection | Consumer Appliance Motor Control |
|
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs in base station equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: First-stage protector on differential pairs, working with GDTs or polymer PTCs in hybrid protection schemes. Use Value: Symmetrical bidirectional clamping avoids polarity concerns on AC-coupled data lines; MSL Level 1 simplifies manufacturing logistics. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Mounted across motor terminals or H-bridge outputs to clamp inductive flyback energy into safe limits. Use Value: 600 W rating handles repetitive 8.3 ms half-sine surges (IFSM = 100 A); RoHS-compliant HE3 suffix meets global appliance compliance mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CAHM3_A/I | Halogen-free, RoHS-compliant, AEC-Q101 qualified - identical electrical specs and package. | No functional difference; selected where halogen-free materials are mandated (e.g., EU WEEE/EcoDesign). | Direct material substitution when halogen-free compliance is required; same footprint and thermal performance. |
| SMCJ51CAHE3_A/I | Same VWM, VBR, VC, but in larger SMC (DO-214AB) package with 1500 W PPPM. | Higher power handling suits applications with more severe surge exposure (e.g., outdoor telecom, rail traction). | Choose when higher surge margin is needed; requires PCB layout change due to larger 7.11 mm × 6.22 mm footprint. |
Compared with SMBJ51CAHE3_A/I, SMBJ51CAHM3_A/I offers identical protection performance with halogen-free construction, while SMCJ51CAHE3_A/I provides 2.5× higher peak power in a larger package - enabling design scalability without changing circuit topology.
Availability
SMBJ51CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply and AEC-Q101 traceability.
Supply support for SMBJ51CAHE3_A/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, and protection devices with emphasis on reliability and automotive-grade validation.
The SMBJ series targets high-volume, space-constrained applications needing robust, standardized TVS protection - engineered specifically for automotive, industrial, and communications infrastructure where AEC-Q101 compliance and MSL Level 1 handling are mandatory.
FAQ
What does the "CA" suffix indicate in SMBJ51CAHE3_A/I?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ51CAHE3_A/I clamps voltage transients equally in both directions, unlike unidirectional variants (e.g., SMBJ51A). This makes it ideal for AC-coupled signal lines, differential buses like RS-485, or floating power rails where polarity is undefined. The device has no cathode marking and exhibits symmetric VBR and VC characteristics.
Is SMBJ51CAHE3_A/I suitable for automotive applications?
Yes, SMBJ51CAHE3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code "HE3" suffix and documentation. It meets rigorous stress testing for temperature cycling, humidity, mechanical shock, and surge immunity - making it appropriate for under-hood and cabin-mounted ECUs, ADAS sensors, and infotainment power supplies where reliability under harsh conditions is essential.
What is the clamping voltage of SMBJ51CAHE3_A/I and why does it matter?
The clamping voltage (VC) of SMBJ51CAHE3_A/I is 82.4 V at 7.3 A peak pulse current (10/1000 µs waveform). This value represents the maximum voltage imposed on the protected circuit during a transient event. A lower VC relative to VWM (here, ratio ≈ 1.62) ensures downstream components - such as 5 V or 12 V-rated transceivers - remain within safe operating limits and avoid damage or malfunction.
How does SMBJ51CAHE3_A/I differ from unidirectional SMBJ51AHE3_A/I?
SMBJ51CAHE3_A/I is bidirectional with symmetrical breakdown and clamping behavior in both polarities, while SMBJ51AHE3_A/I is unidirectional and features a cathode band for polarity-sensitive placement. Electrically, SMBJ51AHE3_A/I has a forward voltage drop (VF ≤ 3.5 V at 50 A), whereas SMBJ51CAHE3_A/I does not specify VF due to its dual-junction structure. Use SMBJ51CAHE3_A/I where polarity is undefined or AC signals dominate.
What PCB layout considerations apply to SMBJ51CAHE3_A/I?
For optimal thermal and surge performance, SMBJ51CAHE3_A/I must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay's datasheet. Avoid narrow traces between the device and protected node - keep interconnect inductance low to preserve clamping speed. No polarity orientation is required due to its bidirectional nature, simplifying automated placement and reducing assembly errors.
SMBJ51CAHE3_A/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:
- Obsolete
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ51CAHE3_A/I FAQ
1.How can I place an order for SMBJ51CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CAHE3_A/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 SMBJ51CAHE3_A/I reliable?
The price and inventory of SMBJ51CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ51CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CAHE3_A/I?
SMBJ51CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CAHE3_A/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 SMBJ51CAHE3_A/I?
For technical support, including SMBJ51CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CAHE3_A/I requirements.
6.How does Aetrix verify that SMBJ51CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ51CAHE3_A/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 SMBJ51CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ51CAHE3_A/I?
All SMBJ51CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CAHE3_A/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 SMBJ51CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMBJ51CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CAHE3_A/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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