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Vishay General Semiconductor - Diodes Division SMB8J11CAHM3/H
- Part No.:
- SMB8J11CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J11CAHM3/H.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J11CAHM3/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 11 V standoff voltage (VWM), 12.2–13.5 V breakdown range (VBR at 1 mA), 18.2 V clamping voltage (VC) at 44 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 SMB8J11CAHM3/H datasheet, SMB8J11CAHM3/H pinout, SMB8J11CAHM3/H application, or SMB8J11CAHM3/H equivalent, this part delivers AEC-Q101 qualified transient suppression for bidirectional signal paths where low clamping voltage, fast response (<1 ns), and halogen-free RoHS compliance are required in space-constrained PCB layouts.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust protection of AC-coupled or differential data lines without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<5 µA at VWM), while MSL Level 1 rating supports lead-free reflow up to 260 °C.
The device uses a low incremental surge resistance design to minimize voltage overshoot during fast transients, and its thermal resistance (RθJL = 20 °C/W) enables reliable power dissipation when mounted on 5.0 mm × 5.0 mm copper pads - critical for sustained surge handling in automotive powertrain and ADAS subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal swing margin for protected line. |
| VBR (min/max) | 12.2 V / 13.5 V at 1 mA - verified breakdown threshold range ensuring consistent turn-on behavior across production lots. |
| VC @ IPPM | 18.2 V at 44 A - clamped voltage during 10/1000 µs surge; determines worst-case overvoltage seen by downstream ICs. |
| PPPM | 800 W - peak pulse power handling capability; defines survivability against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω). |
| ID @ VWM | <5 µA - ultra-low reverse leakage at rated standoff voltage; preserves signal integrity in high-impedance sensor circuits. |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| Package | SMB (DO-214AA) - surface-mount outline with 2.20 mm height and 3.94 mm length; compatible with automated pick-and-place and standard reflow profiles. |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking - symmetrical construction enables mounting in either orientation. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, with MSL Level 1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts surge current bidirectionally when voltage exceeds ±VBR. |
| Cathode Band (absent) | Polarity indicator | Not present - confirms bidirectional configuration; eliminates risk of incorrect orientation during placement. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors - meets stress test requirements for temperature cycling, HTRB, and ESD. |
| Halogen-free & RoHS-compliant | HM3 suffix denotes halogen-free molding compound and lead-free terminations - satisfies EU ELV and China RoHS environmental mandates. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage stress on protected ICs; enables use with 3.3 V and 5 V logic families without additional series impedance. |
| Fast response time (<1 ns) | Clamps transients before they propagate through circuitry - essential for protecting high-speed CAN, LIN, and sensor analog front-ends. |
| MSL Level 1, 260 °C peak | Supports single-pass lead-free reflow without popcorn effect or delamination - reduces manufacturing yield loss in high-volume SMT lines. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before reaching ASIC or MCU input pins. Use Value: Maintains signal fidelity below 18.2 V clamping level during 44 A transients, preventing latch-up or permanent damage to 5 V tolerant sensor interface circuitry. |
Use Scenario: Safeguarding PLC digital input modules from inductive kickback caused by relay coil de-energization and field wiring faults. IC Role / Device Role / Timing Role: Primary surge suppression element on 24 V DC input lines, operating in parallel with optocoupler input stages. Use Value: Withstands repeated 800 W surges without degradation, extending module service life in factory automation environments with frequent switching events. |
| USB Type-C Port Protection | RS-485 Transceiver Protection |
|
Use Scenario: Guarding CC and VBUS lines in automotive infotainment USB-C ports against ESD (IEC 61000-4-2 ±15 kV) and cable discharge events. IC Role / Device Role / Timing Role: First-line transient suppressor located adjacent to connector, preceding internal ESD diodes of USB controller. Use Value: Sub-1 ns response captures fast ESD events before internal protection activates, reducing cumulative stress on integrated silicon ESD structures. |
Use Scenario: Shielding half-duplex RS-485 transceivers (e.g., SN65HVD230) in building automation networks from lightning-induced surges on long twisted-pair runs. IC Role / Device Role / Timing Role: Common-mode surge diverter connected between A/B lines and ground, limiting differential and common-mode overvoltages. Use Value: Symmetrical 12.2–13.5 V VBR ensures balanced clamping on both data lines, preserving signal integrity and common-mode rejection ratio (CMRR) during transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J11CAHE3/H | Same electrical specs but RoHS-compliant commercial-grade (non-halogen-free); lacks halogen-free certification. | Suitable for non-automotive industrial applications where halogen-free compliance is not mandated. | Select when cost optimization is prioritized and environmental compliance requirements exclude halogen restrictions. |
| SMAJ11CA | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (90 °C/W), unidirectional variant only unless paired. | Limited to lower-energy surges; requires dual-device layout for bidirectional protection, increasing board area. | Choose only for space-constrained consumer designs with <400 W surge exposure and no AEC-Q101 requirement. |
Compared with SMB8J11CAHM3/H, SMB8J11CAHE3/H offers identical surge performance without halogen-free assurance, while SMAJ11CA sacrifices 50 % peak power rating and automotive qualification - making SMB8J11CAHM3/H the optimal choice for AEC-Q101–mandated, high-power bidirectional protection in compact SMB footprint.
Availability
SMB8J11CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O modules, USB-C port hardening, and RS-485 communication systems requiring stable component supply with full traceability and lifecycle support.
Supply support for SMB8J11CAHM3/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, automotive qualification, and high-power density packaging.
The SMB8JxxCA series targets AEC-Q101–compliant transient suppression for harsh-environment electronics, delivering high-peak-power TVS performance in compact surface-mount packages for next-generation automotive and industrial control systems.
FAQ
What is the clamping voltage of SMB8J11CAHM3/H at its rated peak pulse current?
The SMB8J11CAHM3/H has a maximum clamping voltage (VC) of 18.2 V when subjected to its rated peak pulse current (IPPM) of 44 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and ensures downstream ICs experience no more than 18.2 V during surge events - critical for safeguarding 5 V logic interfaces. The SMB8J11CAHM3/H maintains this clamping performance across its full operating temperature range.
Is SMB8J11CAHM3/H suitable for automotive applications?
Yes, SMB8J11CAHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction - meeting stringent automotive reliability and environmental requirements. It is explicitly rated for under-hood and chassis-mounted applications with operating junction temperatures up to +150 °C. The SMB8J11CAHM3/H is commonly used in engine control units, ADAS camera modules, and body control modules for transient suppression.
How does the bidirectional nature of SMB8J11CAHM3/H affect its circuit implementation?
The SMB8J11CAHM3/H has no polarity marking and functions identically in both directions, allowing direct placement across any two points needing symmetrical overvoltage protection - such as differential data lines (RS-485, CAN) or AC-coupled signals. Unlike unidirectional TVS diodes, it eliminates orientation errors during assembly and avoids the need for dual-device configurations. This simplifies layout and improves reliability in SMB8J11CAHM3/H-based protection schemes.
What is the standoff voltage (VWM) rating for SMB8J11CAHM3/H, and why is it important?
The SMB8J11CAHM3/H has a standoff voltage (VWM) of 11 V, meaning it remains non-conductive up to this reverse voltage level under normal operation. This parameter ensures minimal leakage current (<5 µA) and prevents interference with nominal signal levels - especially vital in high-impedance sensor circuits and low-power wake-up lines. Exceeding VWM triggers clamping, so proper selection relative to system operating voltage is essential for SMB8J11CAHM3/H functionality.
Does SMB8J11CAHM3/H require special PCB layout considerations?
Yes - to achieve rated 800 W pulse power, SMB8J11CAHM3/H must be mounted on minimum 5.0 mm × 5.0 mm copper pads per terminal, as specified in Vishay's thermal derating curves. Smaller pads reduce heat dissipation and cause premature failure during surge events. Additionally, short, wide traces to ground or return paths minimize inductance and preserve clamping speed. These layout rules are mandatory to ensure SMB8J11CAHM3/H performs to datasheet specifications.
SMB8J11CAHM3/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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 44A
- 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)
SMB8J11CAHM3/H FAQ
1.How can I place an order for SMB8J11CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J11CAHM3/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 SMB8J11CAHM3/H reliable?
The price and inventory of SMB8J11CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J11CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMB8J11CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J11CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J11CAHM3/H?
SMB8J11CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J11CAHM3/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 SMB8J11CAHM3/H?
For technical support, including SMB8J11CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J11CAHM3/H requirements.
6.How does Aetrix verify that SMB8J11CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMB8J11CAHM3/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 SMB8J11CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMB8J11CAHM3/H?
All SMB8J11CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J11CAHM3/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 SMB8J11CAHM3/H part is unused and in its original packaging.
Return procedure for SMB8J11CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J11CAHM3/H Tags
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