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Vishay General Semiconductor - Diodes Division SMBJ51CAHE3_A/H
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- Part No.:
- SMBJ51CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CAHE3_A/H.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,569
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Product details
Overview
SMBJ51CAHE3_A/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V stand-off 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 junction temperature - deployed on signal lines of industrial sensor units and telecom interfaces.
For engineers reviewing the SMBJ51CAHE3_A/H datasheet, SMBJ51CAHE3_A/H pinout, SMBJ51CAHE3_A/H application, or SMBJ51CAHE3_A/H equivalent, this device is evaluated for ESD/surge immunity in bidirectional data paths, PCB-level transient suppression near MOSFET gate drivers, and compliance-critical automotive-grade protection where AEC-Q101 qualification and MSL Level 1 handling are required.
Technical Context
This bidirectional TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1 ns) 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 maximum reverse leakage of 1.0 µA at VWM.
The device is rated for 600 W peak pulse power under standard 10/1000 µs waveform, derated linearly above 25 °C ambient per Fig. 2, and supports repetitive surge duty cycle up to 0.01 %. Thermal resistance is 100 °C/W (junction-to-ambient) on recommended 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before conduction begins; defines safe signal swing range for protected line. |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above normal operating voltage. |
| VC @ IPPM | 82.4 V at 7.3 A - Clamped voltage during 600 W transient; determines maximum stress imposed on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling (10/1000 µs); validates protection against lightning-induced surges and inductive switching transients. |
| IPPM | 7.3 A - Peak pulse current corresponding to 600 W clamping; used to size PCB trace width and verify layout survivability. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and high-ambient industrial environments. |
| MSL Level | Level 1 (per J-STD-020) - Supports standard reflow without moisture sensitivity concerns; no bake required prior to assembly. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative transients; forms symmetrical conduction path with cathode. |
| Cathode | Transient current entry (positive polarity) | Accepts reverse surge current during positive transients; completes bidirectional clamping loop with anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, USB D+/D−) without polarity constraints. |
| AEC-Q101 qualified | Validated for automotive applications including infotainment and body control modules requiring long-term reliability under thermal cycling and vibration. |
| 600 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 (4 kV surge) when properly laid out - sufficient for industrial Ethernet and PoE-powered devices. |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes voltage overshoot during clamping; reduces risk of latch-up or damage to 3.3 V/5 V logic interfaces downstream. |
| MSL Level 1 & lead-free | Eliminates pre-bake steps and supports lead-free reflow profiles up to 260 °C peak - compatible with high-volume automated SMT lines. |
Applications
| Industrial Sensor Interface Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting analog output lines (4–20 mA) and digital I/O (CAN/LIN) in factory-floor pressure/temperature sensors exposed to motor drive noise and relay switching. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector entry point to shunt ESD (IEC 61000-4-2 ±8 kV) and surge (IEC 61000-4-5 2 kV) energy away from signal conditioning ICs. Use Value: Prevents field failures caused by induced transients on long cable runs; maintains signal integrity without adding capacitance (>100 pF) that would distort 10 kHz sensor bandwidth. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller GPIOs in door module ECUs subjected to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary overvoltage clamp on LIN data line and power-supply rail inputs, operating alongside ceramic decoupling capacitors. Use Value: Survives repeated 12 V system transients up to 40 V/100 ms (ISO 7637-2 Pulse 5a) while maintaining AEC-Q101 qualification for 15-year vehicle lifetime. |
| Telecom DSL Line Interface | Consumer USB-C Port ESD Protection |
|
Use Scenario: Front-end protection of ADSL/VDSL line drivers and receivers connected to external telephone wiring vulnerable to lightning-induced surges. IC Role / Device Role / Timing Role: First-stage TVS on differential pair (tip/ring), coordinated with common-mode chokes and secondary GDTs for multi-stage surge handling. Use Value: Limits clamped voltage to <85 V, ensuring compliance with GR-1089-CORE Level 3 (10/700 µs, 1 kV) without degrading high-frequency signal integrity up to 30 MHz. |
Use Scenario: Board-level ESD safeguard for USB-C receptacle CC, SBU, and VBUS pins in portable monitors and docking stations. IC Role / Device Role / Timing Role: Secondary protection element after integrated ESD arrays, absorbing residual 30 kV HBM transients that bypass front-end filters. Use Value: Provides fail-safe backup clamping with 82.4 V VC, preventing latch-up in USB PD controllers during hot-plug events with misaligned connectors. |
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-M3/52 | Same electrical specs and SMB package; halogen-free, RoHS-compliant, commercial grade (non-AEC-Q101). | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive qualification requirements and supply chain allows non-HE3 variants. |
| SMCJ51CAHE3_A/H | Same VWM/VC but in larger SMC (DO-214AB) package; 1500 W PPPM, higher IPPM (12.3 A), RθJA = 50 °C/W. | Offers 2.5× higher surge capacity and better thermal dissipation; requires larger PCB footprint and different pad layout. | Choose when system-level surge testing exceeds 600 W or when extended thermal margin is needed in enclosed enclosures. |
Compared with SMBJ51CAHE3_A/H, SMBJ51CA-M3/52 provides identical protection performance without automotive qualification, while SMCJ51CAHE3_A/H delivers significantly higher surge endurance at the cost of board space - enabling trade-offs between qualification assurance, footprint, and robustness.
Availability
SMBJ51CAHE3_A/H is available at Aetrix Electronics and suitable for industrial sensor interface protection, automotive body control modules, telecom DSL line interfaces, and consumer USB-C port ESD protection requiring stable component supply and AEC-Q101 compliance.
Supply support for SMBJ51CAHE3_A/H 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, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where consistent clamping, low leakage, and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ51CAHE3_A/H at its rated peak pulse current?
The SMBJ51CAHE3_A/H has a maximum clamping voltage (VC) of 82.4 V at its peak pulse current (IPPM) of 7.3 A, measured under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-rated transient event and is confirmed in the Vishay datasheet Document Number 88392, Table on page 2. The SMBJ51CAHE3_A/H maintains this clamping performance across its full operating temperature range.
Is SMBJ51CAHE3_A/H suitable for automotive applications?
Yes, SMBJ51CAHE3_A/H is AEC-Q101 qualified, as indicated by the "HE3" suffix and confirmed in the Vishay ordering information table (page 3). It is rated for operation from -55 °C to +150 °C and meets MSL Level 1 for moisture sensitivity - making it appropriate for under-hood and cabin-mounted automotive modules such as body control units and sensor interfaces. The SMBJ51CAHE3_A/H qualification covers thermal cycling, mechanical shock, and high-temperature reverse bias stress per AEC-Q101 requirements.
How does the bidirectional design of SMBJ51CAHE3_A/H affect its use in circuit protection?
The bidirectional design of SMBJ51CAHE3_A/H allows it to protect AC-coupled or floating signal lines - such as RS-485, CAN, or telecom tip/ring pairs - without requiring polarity awareness during placement. Unlike unidirectional TVS diodes, SMBJ51CAHE3_A/H conducts symmetrically in both directions, providing identical clamping voltage and breakdown characteristics for positive and negative transients. This eliminates the need for dual-device solutions or polarity-sensitive layout, simplifying design and reducing BOM count.
What is the thermal resistance of SMBJ51CAHE3_A/H, and how does it impact PCB layout?
The SMBJ51CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the minimum recommended 5.0 mm × 5.0 mm copper pads per terminal, as specified in the Vishay datasheet. This value assumes no additional heatsinking; designers must allocate adequate copper area and consider airflow or enclosure constraints to avoid exceeding the +150 °C maximum junction temperature during repetitive surge events. The SMBJ51CAHE3_A/H thermal performance directly influences sustained surge duty cycle capability.
Does SMBJ51CAHE3_A/H have any special handling or soldering requirements?
No special handling is required: SMBJ51CAHE3_A/H is rated MSL Level 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions and processed through standard lead-free reflow profiles with peak temperatures up to 260 °C without baking. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 for solderability, and whisker resistance meets JESD 201 Class 2. The SMBJ51CAHE3_A/H is fully compatible with high-speed automated placement and standard SMT assembly lines.
SMBJ51CAHE3_A/H 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/H FAQ
1.How can I place an order for SMBJ51CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CAHE3_A/H 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/H reliable?
The price and inventory of SMBJ51CAHE3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMBJ51CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CAHE3_A/H?
SMBJ51CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CAHE3_A/H 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/H?
For technical support, including SMBJ51CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CAHE3_A/H requirements.
6.How does Aetrix verify that SMBJ51CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ51CAHE3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SMBJ51CAHE3_A/H?
All SMBJ51CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CAHE3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SMBJ51CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CAHE3_A/H Tags
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