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Vishay General Semiconductor - Diodes Division SMB8J18CAHM3/H
- Part No.:
- SMB8J18CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J18CAHM3/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,564
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Product details
Overview
SMB8J18CAHM3/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 stand-off 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 - suitable for automotive sensor interface and industrial I/O line protection.
For engineers reviewing the SMB8J18CAHM3/H datasheet, SMB8J18CAHM3/H pinout, SMB8J18CAHM3/H application, or SMB8J18CAHM3/H equivalent, this device is evaluated for AEC-Q101 qualified surge immunity in harsh environments, including CAN/LIN bus nodes, automotive body control modules, and industrial PLC analog input stages where low-leakage (<1.0 µA at VWM) and fast response (<1 ns) are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust protection against ESD, lightning-induced transients, and inductive switching spikes without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance under repetitive stress.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards - confirming suitability for automated SMT assembly in automotive-grade production.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse stand-off voltage before conduction begins; defines safe operating margin below clamping threshold |
| VBR min/max | 20.0 V / 22.1 V at 1.0 mA test current - guaranteed breakdown range ensures predictable turn-on during overvoltage events |
| VC @ IPPM | 29.2 V at 27.4 A - clamping voltage limits downstream IC stress during 10/1000 µs surge; enables <12 V margin for 18 V rail systems |
| PPPM | 800 W - peak pulse power handling capability with 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 compliance when properly laid out |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage preserves signal integrity and battery life in always-on sensor circuits |
| TJ max | +150 °C - extended junction temperature rating supports under-hood automotive placement and high-ambient industrial use |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with IPC-7351B generic land pattern |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking - symmetrical construction eliminates cathode/anode orientation concerns during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Terminals 1 & 2) | Surge current path | Interchangeable terminals; bidirectional conduction allows single-device protection of AC-coupled or floating lines without routing constraints |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces per stress test requirements |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets automotive environmental mandates and end-of-life recycling requirements without compromising surge performance |
| MSL Level 1 moisture sensitivity | Enables direct placement from dry pack without baking; supports high-throughput SMT lines with 260 °C peak reflow profile |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes let-through energy during clamping - critical for protecting 24 V tolerant microcontrollers and transceivers |
| Glass-passivated junction | Ensures long-term stability of breakdown voltage and leakage under thermal cycling and humidity exposure |
Applications
| Automotive Sensor Interface | Industrial Analog Input Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and temperature/humidity sensors in vehicle cabin modules exposed to load dump and ESD. IC Role / Device Role / Timing Role: Bidirectional TVS placed between sensor signal line and ground to clamp transients before reaching ASIC input pins. Use Value: 29.2 V clamping voltage prevents damage to 3.3 V or 5 V sensor interface ICs while maintaining <1 µA leakage for precision measurement accuracy. |
Use Scenario: Safeguarding 4–20 mA current loop inputs in programmable logic controllers subjected to field wiring surges. IC Role / Device Role / Timing Role: Primary surge suppression element across input terminals, coordinated with series current-limiting resistor. Use Value: 800 W PPPM rating handles IEC 61000-4-5 2 kV surge tests; SMB footprint enables dense I/O module layouts without sacrificing protection margin. |
| Automotive Body Control Module | Telecom Power Line Protection |
Use Scenario: Guarding power supply rails feeding door lock actuators and mirror control ICs against battery reverse connection and jump-start spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS on 12 V distribution net upstream of DC/DC converter input. Use Value: 150 °C TJ max enables mounting near heat-generating relays; halogen-free HM3 construction satisfies OEM material declarations. |
Use Scenario: Protecting PoE-powered Ethernet switches from induced surges on 48 V DC input derived from outdoor cabling. IC Role / Device Role / Timing Role: Secondary-level TVS after primary MOV stage, providing precise clamping for sensitive DC/DC controller ICs. Use Value: 27.4 A IPPM and 29.2 V VC ensure coordination with upstream protectors while limiting let-through voltage to <30 V for 48 V system safety margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J18CAHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Acceptable for commercial-automotive hybrids where halogen content is unrestricted | Select when cost optimization is prioritized over full automotive material compliance |
| SMAJ18CAHM3 | Lower PPPM (400 W), smaller SMA package (DO-214AC), identical VWM/VC ratings | Used in space-constrained consumer electronics; insufficient for automotive-level surge testing | Choose only for non-AEC-Q101 applications requiring reduced board area and lower energy threats |
Compared with SMB8J18CAHM3/H, SMB8J18CAHE3/H offers identical surge performance and qualification but lacks halogen-free certification, while SMAJ18CAHM3 trades 50 % power rating and automotive qualification for smaller footprint - making SMB8J18CAHM3/H the sole option meeting full AEC-Q101 + halogen-free + 800 W requirements.
Availability
SMB8J18CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial analog input protection, and telecom power line safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMB8J18CAHM3/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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMB8JxxCA family delivers AEC-Q101-qualified TVS diodes optimized for bidirectional surge protection in harsh-environment electronics - emphasizing low clamping, high power density, and process-controlled consistency for mission-critical applications.
FAQ
What is the clamping voltage of SMB8J18CAHM3/H at its rated peak pulse current?
The SMB8J18CAHM3/H has a maximum clamping voltage (VC) of 29.2 V at 27.4 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 3.3 V, 5 V, or 24 V system rails downstream of the SMB8J18CAHM3/H.
Is SMB8J18CAHM3/H qualified for automotive applications?
Yes, SMB8J18CAHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction. It is specifically intended for automotive use cases including body control modules, sensor interfaces, and infotainment power supplies - validated for temperature cycling, humidity testing, and mechanical shock per the AEC-Q101 standard.
What does the "HM3" suffix mean in SMB8J18CAHM3/H?
The "HM3" suffix in SMB8J18CAHM3/H denotes halogen-free, RoHS-compliant packaging and materials, aligned with automotive OEM environmental requirements. It also indicates compliance with JESD 201 Class 2 whisker resistance and MSL Level 1 handling - distinguishing it from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS) variants of the same device.
Can SMB8J18CAHM3/H be used in bidirectional signal lines like RS-485 or CAN?
Yes, SMB8J18CAHM3/H is explicitly designed for bidirectional operation and is commonly deployed on differential buses such as CAN and RS-485. Its symmetrical breakdown characteristics (20.0 V to 22.1 V in both directions) and low clamping voltage (29.2 V) ensure balanced protection without polarity-dependent performance - preserving signal integrity during ESD and surge events.
What is the thermal resistance of SMB8J18CAHM3/H from junction to ambient?
The typical thermal resistance from junction to ambient (RθJA) for SMB8J18CAHM3/H is 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard PCB layout per Vishay's recommended pad dimensions and is essential for estimating junction temperature rise during repetitive surge events or elevated ambient conditions.
SMB8J18CAHM3/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:
- Discontinued at Digi-Key
- 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:
- 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)
SMB8J18CAHM3/H FAQ
1.How can I place an order for SMB8J18CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J18CAHM3/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 SMB8J18CAHM3/H reliable?
The price and inventory of SMB8J18CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J18CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMB8J18CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J18CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J18CAHM3/H?
SMB8J18CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J18CAHM3/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 SMB8J18CAHM3/H?
For technical support, including SMB8J18CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J18CAHM3/H requirements.
6.How does Aetrix verify that SMB8J18CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMB8J18CAHM3/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 SMB8J18CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMB8J18CAHM3/H?
All SMB8J18CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J18CAHM3/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 SMB8J18CAHM3/H part is unused and in its original packaging.
Return procedure for SMB8J18CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J18CAHM3/H Tags
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