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Vishay General Semiconductor - Diodes Division SMBJ18CAHE3_A/H
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- Part No.:
- SMBJ18CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CAHE3_A/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:1,300
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Product details
Overview
SMBJ18CAHE3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, with 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR at 1 mA), 600 W peak pulse power (10/1000 µs), and clamping voltage of 29.2 V at 20.5 A. It protects signal lines and power rails in sensor interfaces and industrial control systems against ESD and inductive switching transients.
For engineers reviewing the SMBJ18CAHE3_A/H datasheet, SMBJ18CAHE3_A/H pinout, SMBJ18CAHE3_A/H application, or SMBJ18CAHE3_A/H equivalent, this AEC-Q101 qualified TVS offers verified bidirectional clamping, low leakage (<1.0 µA at 18 V), and MSL Level 1 moisture sensitivity - critical for automotive sensor modules, industrial I/O protection, and telecom interface hardening.
Technical Context
This device operates as a voltage-clamped surge protector: during transient events exceeding VWM, it avalanches into low-impedance conduction to limit voltage across protected circuitry. Its bidirectional symmetry enables use on AC-coupled or floating lines without polarity concerns.
Designed for fast response (<1 ns), it delivers stable clamping under repetitive 10/1000 µs surges at 0.01% duty cycle, with thermal resistance RθJA = 100 °C/W and junction temperature range from –55 °C to +150 °C - supporting operation in harsh environments including engine compartments and factory automation nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - guaranteed avalanche onset window defining turn-on consistency |
| VC @ IPPM | 29.2 V at 20.5 A - clamped voltage during 600 W transient, limiting downstream stress |
| IPPM | 20.5 A - peak surge current capability under standard 10/1000 µs waveform |
| Leakage (ID) | <1.0 µA at 18 V - minimal standby power loss and signal integrity impact |
| Package | SMB (DO-214AA) - 0.205" × 0.130" footprint compatible with automated SMT placement |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking required. Cathode/anode terminals are functionally symmetric - either lead may connect to line or ground depending on circuit topology.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Conducts during negative voltage excursions above –VBR; connects to protected node or return path |
| Cathode | Transient current entry (positive half-cycle) | Conducts during positive voltage excursions above +VBR; symmetric role to Anode in bidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or ungrounded sensor outputs without polarity constraints |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) on 24 V industrial lines |
| AEC-Q101 qualification | Validated for automotive applications including body electronics and ADAS sensor interfaces |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without baking or special handling |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure |
Applications
| Automotive Sensor Protection | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and temperature/pressure sensors in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and chassis ground to clamp ±200 V transients within 1 ns. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V sensor interface ICs while maintaining <1 µA leakage at 18 V nominal supply. | Use Scenario: Shielding 4–20 mA current loop inputs in programmable logic controllers from field wiring surges and ESD events. IC Role / Device Role / Timing Role: Placed across input terminals to shunt transients before they reach precision op-amps and ADC front-ends. Use Value: Limits clamped voltage to 29.2 V, staying well below 36 V absolute max rating of industrial-grade signal conditioners. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Safeguarding Ethernet PHY magnetics and RJ45 port circuitry in PoE-powered access points against lightning-induced surges. IC Role / Device Role / Timing Role: Used in common-mode configuration across differential pairs to suppress mode conversion transients. Use Value: Symmetric VBR (20.0–22.1 V) ensures balanced clamping on both TX+/TX– lines, preserving signal integrity during 10/1000 µs events. | Use Scenario: Suppressing inductive kickback from brushed DC motors in smart home appliances (e.g., washing machine drum drives). IC Role / Device Role / Timing Role: Mounted across motor terminals to absorb energy from L·di/dt spikes during MOSFET commutation. Use Value: 600 W rating handles repeated 50 A surge peaks without degradation, extending board-level reliability beyond 100,000 cycles. |
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 | Same electrical specs, RoHS-compliant commercial grade (non-AEC-Q101) | Lacks automotive qualification; suitable for consumer/industrial only | Select when AEC-Q101 is not required and cost optimization is prioritized |
| SMAJ18CAHE3_A/H | Lower 400 W PPPM rating; SMA package (smaller footprint, higher RθJA) | Reduced surge margin; limited to lower-energy transients in space-constrained designs | Choose only if PCB area is critical and peak surge energy remains ≤400 W |
Compared with SMBJ18CAHE3_A/H, the E3/52 variant omits automotive qualification but retains identical clamping behavior, while the SMAJ18CAHE3_A/H trades 33% peak power headroom for 30% smaller board area - making SMBJ18CAHE3_A/H optimal for high-reliability 24 V systems where surge margin and qualification are non-negotiable.
Availability
SMBJ18CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC analog inputs, and telecom line interfaces requiring stable component supply, long-lifecycle support, and traceable AEC-Q101 compliance.
Supply support for SMBJ18CAHE3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated through proven clamping accuracy and rugged packaging.
FAQ
What does the "CA" suffix indicate in SMBJ18CAHE3_A/H?
The "CA" suffix denotes a bidirectional configuration: SMBJ18CAHE3_A/H conducts and clamps symmetrically for both positive and negative voltage transients, unlike unidirectional "A" variants that only protect against one polarity. This makes SMBJ18CAHE3_A/H ideal for AC-coupled lines, differential interfaces, and floating grounds where polarity is undefined or alternating.
Is SMBJ18CAHE3_A/H suitable for protecting 24 V power rails?
Yes - SMBJ18CAHE3_A/H has a 18 V standoff voltage (VWM) and 29.2 V clamping voltage (VC), making it appropriate for 24 V nominal systems. Its 600 W peak pulse rating handles IEC 61000-4-5 surges up to 4 kV on 24 V lines, and its –55 °C to +150 °C operating range supports under-hood and industrial deployment where SMBJ18CAHE3_A/H remains stable and responsive.
How does the HE3 suffix differ from E3 in Vishay's ordering nomenclature?
The "HE3" suffix indicates RoHS-compliant construction with AEC-Q101 qualification, whereas "E3" denotes RoHS compliance only for commercial-grade use. SMBJ18CAHE3_A/H undergoes extended stress testing per AEC-Q101 - including temperature cycling, highly accelerated life testing, and unbiased HAST - ensuring reliability in automotive applications where SMBJ18CAHE3_A/H is deployed in safety-critical sensor nodes.
What is the thermal resistance of SMBJ18CAHE3_A/H, and how does it affect layout?
SMBJ18CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. To maintain safe junction temperatures during repetitive surges, PCB layout must provide adequate copper area - undersized traces or insufficient thermal relief will cause localized heating, degrading clamping consistency and shortening SMBJ18CAHE3_A/H lifetime.
Can SMBJ18CAHE3_A/H replace SMBJ18AHE3_A/H in a design?
No - SMBJ18CAHE3_A/H is bidirectional, while SMBJ18AHE3_A/H is unidirectional (cathode-marked, conducts only in reverse bias). Substituting them requires verifying circuit polarity: using SMBJ18CAHE3_A/H in place of SMBJ18AHE3_A/H adds unnecessary bidirectional conduction risk on DC-biased lines, and vice versa fails to protect negative transients. Always match SMBJ18CAHE3_A/H to bidirectional or AC-coupled use cases.
SMBJ18CAHE3_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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ18CAHE3_A/H FAQ
1.How can I place an order for SMBJ18CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CAHE3_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 SMBJ18CAHE3_A/H reliable?
The price and inventory of SMBJ18CAHE3_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 SMBJ18CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ18CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CAHE3_A/H?
SMBJ18CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CAHE3_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 SMBJ18CAHE3_A/H?
For technical support, including SMBJ18CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CAHE3_A/H requirements.
6.How does Aetrix verify that SMBJ18CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ18CAHE3_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 SMBJ18CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ18CAHE3_A/H?
All SMBJ18CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CAHE3_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 SMBJ18CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMBJ18CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CAHE3_A/H Tags
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