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Vishay General Semiconductor - Diodes Division SMBJ18CAHE3_B/H
- Part No.:
- SMBJ18CAHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CAHE3_B/H.pdf
- Description:
- 600W,18V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,907
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Product details
Overview
SMBJ18CAHE3_B/H 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 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), 29.2 V maximum clamping voltage (VC) at 20.5 A, and operates across -55 °C to +150 °C junction temperature range - deployed in industrial sensor interface protection.
For engineers reviewing the SMBJ18CAHE3_B/H datasheet, SMBJ18CAHE3_B/H pinout, SMBJ18CAHE3_B/H application, or SMBJ18CAHE3_B/H equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), bidirectional clamping behavior, and direct replacement guidance for automotive-grade transient suppression.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ps) to ESD and lightning-induced surges. Its bidirectional architecture enables symmetrical clamping in AC-coupled or floating signal paths without polarity dependency.
Rated for 600 W peak pulse power under 10/1000 µs waveform with 0.01% duty cycle, it sustains repetitive transients when mounted on 5.0 mm × 5.0 mm copper pads. Thermal design relies on RθJL = 20 °C/W (junction-to-lead) and RθJA = 100 °C/W (junction-to-ambient) under standard PCB layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe working limit for protected line. |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above VWM with margin. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamped voltage during 600 W surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling per 10/1000 µs waveform; validates robustness against IEC 61000-4-5 Level 4 surges. |
| Junction Temp | -55 °C to +150 °C - Enables operation in under-hood automotive and industrial environments without derating. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive electronics; supports HE3 suffix variant for automotive use. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated placement and reflow. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; reverse-biased path during negative transient | One side of symmetrical junction; no marking on bidirectional devices - terminals are functionally identical. |
| Cathode | Current exit terminal in forward bias; reverse-biased path during positive transient | Other side of symmetrical junction; bidirectional operation eliminates polarity dependency in layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or floating buses without external polarity management. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 4 kV surge (line-earth) without degradation when properly mounted. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile (peak 260 °C), simplifying SMT manufacturing. |
Applications
| Industrial Sensor Interface | Automotive CAN Bus Protection |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) from inductive switching noise in PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and ground to clamp ±1 kV EFT bursts. Use Value: Limits voltage excursion to ≤29.2 V, preventing damage to precision op-amps and ADC front-ends. |
Use Scenario: Guarding high-speed CAN FD transceivers (e.g., TJA1044) against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Placed between CANH/CANL differential pair and ground to suppress common-mode surges. Use Value: Maintains bus integrity by clamping transients within CAN physical layer tolerance (±40 V) without latch-up. |
| Telecom Line Card Surge Protection | Consumer USB Port ESD Shielding |
|
Use Scenario: Safeguarding Ethernet PHY interfaces (e.g., DP83848) on telecom line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Paired with gas discharge tube (GDT) in hybrid protection scheme for primary/secondary clamping. Use Value: Provides low-clamp secondary stage after GDT crowbar, limiting residual voltage to <30 V at 20 A. |
Use Scenario: Adding board-level ESD immunity to USB 2.0 data lines (D+/D−) in smart home hubs and docking stations. IC Role / Device Role / Timing Role: Bidirectional TVS placed differentially across D+ and D− to absorb ±15 kV contact discharge (IEC 61000-4-2). Use Value: Prevents latch-up in USB transceivers by clamping ESD events within 1 ns, preserving signal integrity up to 480 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA-E3/52 | No AEC-Q101 qualification; commercial-grade only; same VWM, VBR, and VC specs. | Suitable for non-automotive industrial or consumer designs where automotive reliability testing is not required. | Select when cost sensitivity outweighs automotive qualification needs and lifecycle assurance is less critical. |
| SMCJ18CAHE3_A/H | Larger SMC (DO-214AB) package; 1500 W PPPM; identical VWM/VBR/VC but higher surge capacity. | Used where higher energy transients (e.g., 10/1000 µs >30 A) demand greater robustness than SMBJ series provides. | Choose when system-level surge testing exceeds 600 W or PCB layout allows larger footprint for enhanced margin. |
Compared with SMBJ18CAHE3_B/H, the E3/52 variant lacks automotive qualification but matches all electrical parameters, while the SMCJ18CAHE3_A/H offers higher surge rating in a larger package - enabling trade-offs between board space, qualification level, and energy handling.
Availability
SMBJ18CAHE3_B/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive CAN bus protection, telecom line card surge suppression, and consumer USB port ESD shielding requiring stable component supply and AEC-Q101 compliance.
Supply support for SMBJ18CAHE3_B/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, MOSFETs, and protection devices with emphasis on reliability and application-specific performance.
The SMBJ series targets board-level transient protection in automotive, industrial, and telecom systems, with design focus on fast response, repeatable clamping, and AEC-Q101-compliant ruggedness for harsh environments.
FAQ
What does the "CA" suffix indicate in SMBJ18CAHE3_B/H?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ18CAHE3_B/H provides symmetrical clamping for both positive and negative transients without polarity constraints. This differs from unidirectional "A" variants that require correct cathode orientation. The CA version is ideal for AC-coupled lines, differential buses like CAN or RS-485, and floating sensor outputs where voltage polarity may reverse.
Is SMBJ18CAHE3_B/H RoHS-compliant and halogen-free?
Yes, SMBJ18CAHE3_B/H is RoHS-compliant and halogen-free, as confirmed by its HM3-related suffix structure and Vishay's material categorization documentation. The "HE3" base indicates RoHS compliance, while the full ordering code "HE3_B/H" aligns with Vishay's halogen-free, AEC-Q101-qualified product line - meeting JEDEC J-STD-201 Class 2 whisker resistance and UL 94 V-0 flammability standards.
How does SMBJ18CAHE3_B/H perform under repeated surge conditions?
SMBJ18CAHE3_B/H supports repetitive 10/1000 µs surges at 0.01% duty cycle, meaning it can handle one 600 W pulse per 10,000 µs without thermal runaway when mounted per recommended pad layout (0.2" × 0.2" copper). Derating applies above 25 °C ambient - e.g., at 85 °C, peak power drops to ~360 W per Vishay's Fig. 2 curve. Its glass-passivated junction ensures stable performance over thousands of surge events.
Can SMBJ18CAHE3_B/H replace SMBJ18AHE3_B/H in an existing design?
No - SMBJ18CAHE3_B/H is bidirectional, while SMBJ18AHE3_B/H is unidirectional and requires correct cathode orientation. Swapping them risks improper clamping during negative transients or forward conduction in DC-biased circuits. If the original design uses unidirectional protection, retain SMBJ18AHE3_B/H; if bidirectional behavior is needed (e.g., for AC signals), verify layout symmetry and absence of DC bias before substituting SMBJ18CAHE3_B/H.
What is the significance of the "B/H" suffix in SMBJ18CAHE3_B/H?
The "B/H" suffix in SMBJ18CAHE3_B/H specifies packaging: "H" denotes 7-inch tape-and-reel delivery (750 units per reel), and "B" indicates the revision level per Vishay's internal change control. This matches the ordering information table in Document 88392, confirming it is a production-ready, AEC-Q101-qualified variant supplied in standard SMT-compatible format with traceable lot coding and full compliance documentation.
SMBJ18CAHE3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 20.5A
- 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)
SMBJ18CAHE3_B/H FAQ
1.How can I place an order for SMBJ18CAHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CAHE3_B/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 SMBJ18CAHE3_B/H reliable?
The price and inventory of SMBJ18CAHE3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18CAHE3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ18CAHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CAHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CAHE3_B/H?
SMBJ18CAHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CAHE3_B/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 SMBJ18CAHE3_B/H?
For technical support, including SMBJ18CAHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CAHE3_B/H requirements.
6.How does Aetrix verify that SMBJ18CAHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ18CAHE3_B/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 SMBJ18CAHE3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ18CAHE3_B/H?
All SMBJ18CAHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CAHE3_B/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 SMBJ18CAHE3_B/H part is unused and in its original packaging.
Return procedure for SMBJ18CAHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CAHE3_B/H Tags
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