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Vishay General Semiconductor - Diodes Division SMB8J7.0CAHM3/I
- Part No.:
- SMB8J7.0CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J7.0CAHM3/I.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,872
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Product details
Overview
SMB8J7.0CAHM3/I 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 7.0 V stand-off voltage (VWM), 12.0 V clamping voltage (VC) at 400 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line conditioning.
For engineers reviewing the SMB8J7.0CAHM3/I datasheet, SMB8J7.0CAHM3/I pinout, SMB8J7.0CAHM3/I application, or SMB8J7.0CAHM3/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 72 °C/W), mounting pad layout guidance, and direct alternatives for ESD/surge-critical designs requiring halogen-free, RoHS-compliant TVS components.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust protection against voltage transients induced by inductive switching, lightning surges, and ESD events without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance under repetitive stress.
Rated for -55 °C to +150 °C operating junction temperature, it meets J-STD-020 MSL Level 1 (260 °C peak reflow) and is qualified to AEC-Q101 - confirming suitability for automotive under-hood and chassis-mounted electronics where thermal cycling and long-term reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown in normal operation |
| VBR (min/max) | 7.78 V / 8.60 V at 10 mA test current - guaranteed breakdown threshold range ensuring consistent turn-on during transients |
| VC @ IPPM | 12.0 V at 400 A (10/1000 µs) - clamping voltage limits downstream IC stress to safe levels during worst-case surge events |
| PPPM | 800 W - peak pulse power handling capacity determines survivability against standardized lightning/surge waveforms |
| IPPM | 400 A - peak surge current capability directly maps to IEC 61000-4-5 Level 4 (4 kV/2 Ω) compliance margin |
| RθJA | 72 °C/W - thermal resistance from junction to ambient dictates derating above 25 °C and PCB copper pad design requirements |
| TJ max | +150 °C - maximum junction temperature enables use in high-ambient environments such as engine control units and power converters |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical terminals require no orientation during automated placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts surge current in either direction when VWM exceeded - eliminates polarity concerns in AC or differential line protection |
| Cathode Band (absent) | Visual polarity indicator | Not present on bidirectional variants - confirms device symmetry and simplifies board layout verification |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine management, ADAS sensors, and body control modules per stress test requirements |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU Directive 2011/65/EU and JEDEC J-STD-201 Class 2 whisker resistance - suitable for green manufacturing and export compliance |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without moisture-induced damage - eliminates baking requirement pre-assembly |
| Low Rsurge (incremental) | Minimizes VC overshoot during fast-rising transients - improves protection margin for sensitive 3.3 V or 5 V logic interfaces |
| Glass-passivated junction | Ensures stable VBR over lifetime and temperature; prevents parameter drift in harsh industrial or automotive environments |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role: Bidirectional clamping element placed between signal line and ground, absorbing energy before reaching MCU or ASIC input pins. Use Value: Clamps 400 A surges to ≤12.0 V, preserving signal integrity and preventing latch-up in 5 V tolerant receivers per AEC-Q100 stress limits. |
Use Scenario: Shielding PLC digital input channels from field-wiring induced transients in factory automation systems. IC Role / Device Role: Primary surge suppression stage ahead of optocoupler or Schmitt-trigger input circuitry. Use Value: Withstands repeated 1 kV/500 A surges (IEC 61000-4-5) while maintaining <1 µA leakage at 7.0 V - avoids false triggering in high-impedance sensing nodes. |
| Telecom Line Conditioning | Consumer USB/Type-C Port Protection |
Use Scenario: Safeguarding Ethernet PHY interface lines (e.g., MDI-X pairs) against lightning-induced common-mode surges in outdoor access points. IC Role / Device Role: Common-mode TVS pair (two devices) across differential pair, referenced to chassis ground. Use Value: Symmetric 7.78–8.60 V breakdown ensures balanced clamping; 800 W rating supports EN 61000-4-5 Level 3 (2 kV/12 Ω) compliance with margin. |
Use Scenario: Protecting USB 2.0 D+/D− lines and VBUS against ESD (IEC 61000-4-2 ±15 kV contact) and hot-plug surges in portable audio/video devices. IC Role / Device Role: Low-capacitance (<50 pF typical) bidirectional clamp placed directly at connector entry point. Use Value: 12.0 V clamping prevents damage to 3.3 V USB transceivers while adding <0.3 pF parasitic capacitance - preserves signal rise time and eye diagram integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J7.0CAHE3/I | Same electrical specs, but RoHS-compliant with brominated flame retardant (non-halogen-free); uses E3 suffix instead of HM3 | Acceptable for commercial/industrial use where halogen-free mandate does not apply; not certified for automotive AEC-Q101 | Select when cost sensitivity outweighs halogen-free requirement and automotive qualification is unnecessary |
| SMAJ7.0CA-M3 | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VC - 200 A IPPM, higher RθJA (95 °C/W) | Fit for lower-energy threats (IEC 61000-4-2 only); unsuitable for IEC 61000-4-5 Level 3+ or automotive load dump | Choose for space-constrained consumer PCBs where full 800 W surge immunity is not required |
Compared with SMB8J7.0CAHM3/I, SMB8J7.0CAHE3/I offers identical surge performance but lacks halogen-free certification and AEC-Q101 validation, while SMAJ7.0CA-M3 reduces footprint and power handling - making it viable only for non-automotive, lower-threat environments.
Availability
SMB8J7.0CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O conditioning, and telecom line surge suppression requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification.
Supply support for SMB8J7.0CAHM3/I 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, thermal performance, and automotive-grade validation.
The SMB8J series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density, surface-mount surge protection in automotive, industrial, and communications infrastructure where AEC-Q101 compliance and repeatable clamping behavior are mandatory.
FAQ
What is the clamping voltage of SMB8J7.0CAHM3/I at its rated peak pulse current?
The SMB8J7.0CAHM3/I has a maximum clamping voltage (VC) of 12.0 V when subjected to its rated 400 A peak pulse current (IPPM) using the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry sees no more than 12.0 V during surge events - critical for protecting 5 V logic interfaces. The SMB8J7.0CAHM3/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMB8J7.0CAHM3/I suitable for automotive applications?
Yes, SMB8J7.0CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction - meeting stringent automotive reliability requirements for under-hood and chassis-mounted electronics. It is explicitly rated for operation from -55 °C to +150 °C junction temperature and passes MSL Level 1 reflow, making SMB8J7.0CAHM3/I appropriate for engine control units, ADAS camera modules, and body electronics exposed to thermal cycling and mechanical vibration.
How does the bidirectional configuration of SMB8J7.0CAHM3/I affect circuit design?
The SMB8J7.0CAHM3/I is inherently bidirectional with symmetrical terminals and no cathode band marking, allowing it to clamp voltage transients of either polarity equally - ideal for AC-coupled lines, differential buses (e.g., RS-485, CAN), or ungrounded signal paths. Unlike unidirectional TVS diodes, SMB8J7.0CAHM3/I eliminates orientation constraints during PCB layout and automated assembly, reducing placement errors and enabling simplified routing for balanced protection schemes.
What is the thermal resistance of SMB8J7.0CAHM3/I, and how does it impact PCB layout?
The SMB8J7.0CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value guides minimum copper area requirements: reducing pad size increases RθJA, accelerating thermal derating above 25 °C. For sustained surge duty or high ambient temperatures, designers must follow Vishay's recommended mounting pad layout - documented in the SMB (DO-214AA) outline drawing - to maintain SMB8J7.0CAHM3/I within its +150 °C TJ limit.
Does SMB8J7.0CAHM3/I meet industry surge immunity standards?
Yes, SMB8J7.0CAHM3/I supports compliance with key surge immunity standards including IEC 61000-4-5 (Level 3: 2 kV line-earth, 1 kV line-line) and ISO 7637-2 (Pulse 1, 2a, 3a/b) when applied with proper PCB layout and grounding. Its 800 W peak pulse power rating and 400 A IPPM provide margin beyond Level 4 (4 kV/2 Ω) test conditions. The SMB8J7.0CAHM3/I's low incremental surge resistance and fast response time ensure effective clamping before transient energy damages downstream ICs - validated in Vishay's application notes for automotive and industrial surge protection topologies.
SMB8J7.0CAHM3/I 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):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- 66.7A
- 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)
SMB8J7.0CAHM3/I FAQ
1.How can I place an order for SMB8J7.0CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J7.0CAHM3/I 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 SMB8J7.0CAHM3/I reliable?
The price and inventory of SMB8J7.0CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J7.0CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMB8J7.0CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J7.0CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J7.0CAHM3/I?
SMB8J7.0CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J7.0CAHM3/I 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 SMB8J7.0CAHM3/I?
For technical support, including SMB8J7.0CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J7.0CAHM3/I requirements.
6.How does Aetrix verify that SMB8J7.0CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMB8J7.0CAHM3/I 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 SMB8J7.0CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMB8J7.0CAHM3/I?
All SMB8J7.0CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J7.0CAHM3/I, 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 SMB8J7.0CAHM3/I part is unused and in its original packaging.
Return procedure for SMB8J7.0CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J7.0CAHM3/I Tags
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Diodes Incorporated
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