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Vishay General Semiconductor - Diodes Division SMBJ8.5CAHM3_B/I
- Part No.:
- SMBJ8.5CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CAHM3_B/I.pdf
- Description:
- 600W,8.5V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,443
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Product details
Overview
SMBJ8.5CAHM3_B/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V maximum clamping voltage (VC) at 41.7 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial and telecom equipment.
For engineers reviewing the SMBJ8.5CAHM3_B/I datasheet, SMBJ8.5CAHM3_B/I pinout, SMBJ8.5CAHM3_B/I application, or SMBJ8.5CAHM3_B/I equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification status, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This TVS diode operates symmetrically in both directions, enabling protection of AC-coupled or differential signal lines without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports rapid energy dissipation during ESD or lightning-induced surges.
The device is rated for repetitive 10/1000 µs transients at 0.01% duty cycle and derates linearly above 25 °C ambient, with maximum junction temperature of +150 °C and storage range from –55 °C to +150 °C. Mounting on 0.2" × 0.2" copper pads achieves specified PPPM and thermal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal swing margin for protected circuitry. |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - guaranteed breakdown onset window; ensures predictable clamping threshold across production lots. |
| VC @ IPPM | 14.4 V at 41.7 A - maximum clamped voltage during 10/1000 µs surge; determines worst-case overvoltage seen by downstream ICs. |
| PPPM | 600 W - peak transient power handling capability; enables robust protection against IEC 61000-4-5 Level 3/4 surges. |
| ID @ VWM | <1.0 µA - ultra-low reverse leakage at stand-off voltage; preserves signal integrity and minimizes standby power loss. |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance on standard PCB pad layout; informs thermal design margin under sustained surge duty. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; suitable for under-hood and infotainment systems. |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals function as interchangeable anode/cathode pair depending on instantaneous voltage polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Interchangeable terminal; conducts when voltage exceeds VBR in either direction - no fixed polarity required in layout. |
| Terminal 2 | Anode/Cathode (bidirectional) | Interchangeable terminal; forms symmetrical clamping path across protected line pair or between line and ground. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without polarity concerns. |
| 600 W peak pulse power | Withstands 10/1000 µs surges up to 41.7 A - meets IEC 61000-4-5 Ed. 3 surge immunity requirements for industrial equipment. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates for global electronics manufacturing; JESD201 Class 2 whisker resistance ensures long-term solder joint reliability. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on protected ICs - critical for 3.3 V and 5 V logic interfacing where margin below absolute maximum ratings is tight. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning; eliminates moisture sensitivity handling overhead in SMT line. |
Applications
| Industrial Sensor Interface Protection | Telecom Line Card Surge Suppression |
|---|---|
|
Use Scenario: Protecting analog output lines (4–20 mA) and digital I/O (RS-485) of PLC modules from inductive switching transients and field wiring faults. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across signal pair or signal-to-ground to limit transient excursions within IC absolute maximum ratings. Use Value: Prevents latch-up or permanent damage to precision ADCs and isolated UART transceivers during factory floor ESD events or motor drive coupling. |
Use Scenario: Safeguarding Ethernet PHY and PoE controller inputs on carrier-grade access switches exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on RJ-45 interface side, coordinated with GDT or polymer PTC secondary protection. Use Value: Clamps common-mode surges to ≤14.4 V before they reach 2.5 V tolerant PHY silicon, maintaining link uptime during storm season. |
| Automotive Infotainment Power Rail | Consumer USB-C Port ESD Protection |
|
Use Scenario: Guarding 5 V supply rail feeding display controllers and audio codecs in head units subject to load dump and jump-start transients. IC Role / Device Role / Timing Role: Secondary clamping device downstream of primary TVS or LDO, absorbing residual energy after front-end filtering. Use Value: AEC-Q101 qualification ensures operation across –40 °C to +125 °C under hood conditions; halogen-free construction meets OEM material declarations. |
Use Scenario: Protecting CC, D+/D–, and VBUS pins of USB-C receptacles in portable speakers and docking stations from human-body-model (HBM) ESD. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp integrated into connector-level ESD protection array. Use Value: Sub-1 µA leakage at 5 V preserves battery life in always-on accessories; SMB footprint allows dense placement near connector edge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CAHE3_B/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable where halogen-free requirement is waived (e.g., non-automotive commercial designs). | Select when cost sensitivity outweighs halogen-free mandate; identical thermal and clamping performance. |
| SMAJ8.5CAHM3_A/I | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (140 °C/W), same VWM/VC. | Suitable only for lower-energy transients or space-constrained layouts where 600 W margin is unnecessary. | Choose for compact consumer PCBs with limited surge exposure; avoid in industrial or automotive environments requiring full 600 W rating. |
Compared with SMBJ8.5CAHE3_B/I, the SMBJ8.5CAHM3_B/I adds halogen-free compliance without sacrificing clamping performance or qualification; versus SMAJ8.5CAHM3_A/I, it delivers 50% higher surge power handling and superior thermal dissipation in the same functional role - critical for mission-critical infrastructure.
Availability
SMBJ8.5CAHM3_B/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line cards, automotive infotainment systems, and consumer USB-C port protection requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ8.5CAHM3_B/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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMBJ8.5CAHM3_B/I at its rated peak pulse current?
The SMBJ8.5CAHM3_B/I has a maximum clamping voltage (VC) of 14.4 V at its rated peak pulse current (IPPM) of 41.7 A using the 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ8.5CAHM3_B/I maintains this clamping performance across its qualified temperature range and is validated per AEC-Q101 for automotive use cases.
Is SMBJ8.5CAHM3_B/I suitable for bidirectional signal line protection?
Yes, SMBJ8.5CAHM3_B/I is explicitly designed for bidirectional protection, as indicated by the "CA" suffix and confirmed in Vishay's documentation. Its symmetrical breakdown behavior (VBR min/max applies identically in both directions) makes it ideal for safeguarding differential interfaces like RS-485, CAN bus, or AC-coupled analog lines without requiring polarity-aware placement. The SMBJ8.5CAHM3_B/I exhibits identical clamping and leakage characteristics regardless of voltage polarity across its terminals.
Does SMBJ8.5CAHM3_B/I meet automotive reliability standards?
Yes, SMBJ8.5CAHM3_B/I carries AEC-Q101 qualification, verified through stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD. The "HM3" suffix confirms halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance requirements. This makes the SMBJ8.5CAHM3_B/I appropriate for under-hood and cabin electronics where extended temperature operation (–55 °C to +150 °C) and long-term reliability are mandated.
How does the SMBJ8.5CAHM3_B/I package compare to SMAJ equivalents?
The SMBJ8.5CAHM3_B/I uses the SMB (DO-214AA) package - larger than SMA (DO-214AC) - delivering higher thermal mass and lower RθJA (100 °C/W vs. ~140 °C/W for SMAJ). This enables 50% greater peak pulse power (600 W vs. 400 W) and improved surge endurance. The SMBJ8.5CAHM3_B/I's 5.59 mm × 4.06 mm footprint also provides better mechanical stability in high-vibration environments compared to the smaller SMA outline.
What is the maximum reverse leakage current for SMBJ8.5CAHM3_B/I at its stand-off voltage?
The SMBJ8.5CAHM3_B/I specifies a maximum reverse leakage current (ID) of 1.0 µA at its 8.5 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage preserves signal integrity in high-impedance sensor circuits and minimizes quiescent power draw in battery-powered systems. Leakage remains well below 10 µA across the full operating temperature range, ensuring consistent performance in industrial and automotive applications.
SMBJ8.5CAHM3_B/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 41.7A
- Power - Peak Pulse:
- 600W
- 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)
SMBJ8.5CAHM3_B/I FAQ
1.How can I place an order for SMBJ8.5CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CAHM3_B/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 SMBJ8.5CAHM3_B/I reliable?
The price and inventory of SMBJ8.5CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CAHM3_B/I?
SMBJ8.5CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CAHM3_B/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 SMBJ8.5CAHM3_B/I?
For technical support, including SMBJ8.5CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ8.5CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CAHM3_B/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 SMBJ8.5CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CAHM3_B/I?
All SMBJ8.5CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CAHM3_B/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 SMBJ8.5CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ8.5CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5CAHM3_B/I Tags
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