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Vishay General Semiconductor - Diodes Division SMB8J18CAHE3_A/H
- Part No.:
- SMB8J18CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J18CAHE3_A/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,448
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Product details
Overview
SMB8J18CAHE3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 18 V standoff voltage (VWM), 29.2 V maximum clamping voltage (VC) at 27.4 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J18CAHE3_A/H datasheet, SMB8J18CAHE3_A/H pinout, SMB8J18CAHE3_A/H application, or SMB8J18CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ps to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior across -55 °C to +150 °C operating range, and its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
The device meets AEC-Q101 stress test requirements for automotive use and is rated for MSL Level 1 per J-STD-020 (peak reflow ≤260 °C). Its 20 °C/W junction-to-lead thermal resistance supports reliable power dissipation during repetitive surge events when mounted on minimum recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V automotive or 15 V industrial bus lines. |
| VBR (min/max) | 20.0 V / 22.1 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on threshold under production tolerance. |
| VC @ IPPM | 29.2 V at 27.4 A - Clamped voltage seen by protected circuit during 10/1000 µs surge; limits downstream IC stress below 30 V absolute maximum ratings. |
| PPPM | 800 W - Peak pulse power handling with 10/1000 µs waveform; supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity testing. |
| ID @ VWM | 1.0 µA - Reverse leakage at 18 V; negligible loading on high-impedance sensor bias networks or precision reference paths. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures. |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance; allows direct heat conduction into PCB copper, critical for sustained surge duty cycles. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical terminals suitable for AC or differential line protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Transient current path | Both terminals serve identical clamping function; no cathode band - enables placement without orientation check in automated assembly. |
| Case / Body | Thermal interface | Exposed metal slug provides low-impedance thermal path to PCB copper; requires soldering to ≥5.0 mm × 5.0 mm copper pad per terminal for rated power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules, ADAS sensor interfaces, and body electronics - meets stress test requirements for temperature cycling, HTRB, and ESD. |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = 1.46) versus standard TVS devices, reducing let-through energy to protected ICs during fast-rising transients. |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and leakage current over 15-year automotive service life, even under humidity and thermal cycling stress. |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without popcorn cracking or parameter shift - eliminates pre-bake requirement in high-volume SMT lines. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and automotive material compliance standards (e.g., GMW3172, Ford WSS-M99P9999-A1); no brominated flame retardants in molding compound. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN FD or LIN bus transceivers from load-dump and jump-start transients in vehicle door modules and seat control units. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed directly at connector entry point, absorbing >800 W surges while holding line voltage below 30 V. Use Value: Prevents latch-up or permanent damage to transceiver ICs during 12 V system faults - validated per ISO 7637-2 Pulse 5a (load dump). |
Use Scenario: Safeguarding PLC digital input channels against field-wiring induced surges from solenoid coil de-energization or lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Primary front-end surge limiter on 24 V DC input lines, clamping transients before optocoupler or MCU GPIO protection stages. Use Value: Enables robust 24 V industrial I/O design meeting IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) immunity without external series impedance. |
| Consumer Appliance Motor Control | Telecom Power Rail Protection |
|
Use Scenario: Shielding microcontroller reset lines and Hall-effect rotor position sensors in smart washing machine motor drives from commutation noise. IC Role / Device Role / Timing Role: Localized clamping element adjacent to sensitive analog inputs, suppressing sub-microsecond spikes generated by BLDC inverter switching. Use Value: Eliminates false resets and position errors caused by <100 ns transients - verified with 10/1000 µs waveform testing at 27.4 A. |
Use Scenario: Securing 48 V PoE-powered Ethernet switch PHY power rails against induced surges from nearby AC mains wiring or antenna coupling. IC Role / Device Role / Timing Role: Secondary-level rail clamp on intermediate 48 V distribution net, complementing primary MOV-based AC input protection. Use Value: Maintains PHY IC functionality during telecom-grade surge events (IEC 61000-4-5, 2 kV line-earth) with <30 V clamping ceiling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J18CAHM3_A/H | Halogen-free variant with identical electrical specs and AEC-Q101 qualification; same SMB package and pinout. | No functional difference; selected where halogen-free compliance is mandated by OEM material specifications (e.g., Ford WSS-M99P9999-A1). | Choose SMB8J18CAHM3_A/H when halogen-free content is required; otherwise SMB8J18CAHE3_A/H offers standard RoHS compliance at lower cost. |
| SMBJ18CAHE3_A/H | Lower PPPM rating (600 W vs. 800 W); same VWM (18 V), VC (29.2 V), and package; not AEC-Q101 qualified. | Suitable for commercial/industrial applications without automotive qualification requirements; insufficient for ISO 7637-2 Pulse 5a validation. | Select SMBJ18CAHE3_A/H only for non-automotive designs where 600 W surge rating suffices and AEC-Q101 is not mandated. |
Compared with SMB8J18CAHE3_A/H, SMB8J18CAHM3_A/H adds halogen-free compliance without performance trade-offs, while SMBJ18CAHE3_A/H reduces surge capability and automotive qualification - making SMB8J18CAHE3_A/H the sole option for AEC-Q101–required 800 W bidirectional protection in SMB footprint.
Availability
SMB8J18CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, consumer appliance motor control, and telecom power rail protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMB8J18CAHE3_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, power density, and automotive-grade qualification.
The SMB8JxxCA family delivers high-power-density TVS protection optimized for AEC-Q101–compliant automotive subsystems and industrial equipment exposed to harsh electromagnetic environments.
FAQ
What is the clamping voltage of SMB8J18CAHE3_A/H at its rated peak pulse current?
The SMB8J18CAHE3_A/H exhibits a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current (IPPM) of 27.4 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuits experience less than 30 V stress during standardized surge events - critical for safeguarding 3.3 V or 5 V logic interfaces downstream of the SMB8J18CAHE3_A/H.
Is SMB8J18CAHE3_A/H qualified for automotive applications?
Yes, SMB8J18CAHE3_A/H is explicitly AEC-Q101 qualified, as confirmed in Vishay document 88422 (Revision 09-Jan-2024). It has passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per AEC-Q101 Rev G, making it suitable for under-hood and cabin-mounted automotive electronics such as body control modules and ADAS sensor nodes.
What is the standoff voltage (VWM) and why does it matter for SMB8J18CAHE3_A/H?
The standoff voltage (VWM) of SMB8J18CAHE3_A/H is 18 V - the maximum continuous reverse voltage the device can block without entering avalanche conduction. This parameter ensures compatibility with nominal 12 V automotive systems and 15–24 V industrial buses, providing sufficient margin above normal operating voltage while avoiding premature clamping during benign voltage fluctuations.
Does SMB8J18CAHE3_A/H have polarity markings, and how is it mounted?
No, SMB8J18CAHE3_A/H is a bidirectional TVS diode with no polarity markings - both terminals are functionally identical. It is mounted in SMB (DO-214AA) package with symmetrical leads and requires soldering to 5.0 mm × 5.0 mm copper pads per terminal to achieve rated 800 W pulse power dissipation and thermal performance per Vishay's recommended layout.
How does SMB8J18CAHE3_A/H differ from unidirectional variants like SMB10J18AHE3_A/H?
SMB8J18CAHE3_A/H is bidirectional with symmetric clamping in both directions (VBR = 20.0–22.1 V, VC = 29.2 V), whereas SMB10J18AHE3_A/H is unidirectional (cathode-banded) with forward conduction capability and higher PPPM (1000 W). The "C" suffix denotes bidirectionality; SMB8J18CAHE3_A/H is used for AC-coupled or differential lines, while SMB10J18AHE3_A/H suits DC power rail protection with surge return path.
SMB8J18CAHE3_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):
- 27.4A
- Power - Peak Pulse:
- 800W
- 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 (SMB)
SMB8J18CAHE3_A/H FAQ
1.How can I place an order for SMB8J18CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J18CAHE3_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 SMB8J18CAHE3_A/H reliable?
The price and inventory of SMB8J18CAHE3_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 SMB8J18CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J18CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J18CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J18CAHE3_A/H?
SMB8J18CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J18CAHE3_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 SMB8J18CAHE3_A/H?
For technical support, including SMB8J18CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J18CAHE3_A/H requirements.
6.How does Aetrix verify that SMB8J18CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J18CAHE3_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 SMB8J18CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J18CAHE3_A/H?
All SMB8J18CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J18CAHE3_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 SMB8J18CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMB8J18CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J18CAHE3_A/H Tags
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