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Vishay General Semiconductor - Diodes Division SMBJ8.5CAHM3/I
- Part No.:
- SMBJ8.5CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CAHM3/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,779
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Product details
Overview
SMBJ8.5CAHM3/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 or 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 (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ8.5CAHM3/I datasheet, SMBJ8.5CAHM3/I pinout, SMBJ8.5CAHM3/I application, or SMBJ8.5CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, low clamping voltage under surge, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on PCBs with 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped transient protector with symmetrical avalanche behavior in both polarities, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while MSL Level 1 rating supports lead-free reflow up to 260 °C.
The SMBJ8.5CAHM3/I delivers 600 W surge handling per IEC 61000-4-5 (10/1000 µs) with 0.01% duty cycle, and exhibits a temperature coefficient of VBR at +0.073 %/°C - critical for thermal stability across -55 °C to +150 °C operating range. Its 20 °C/W junction-to-lead thermal resistance supports localized heat dissipation during repetitive surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - guaranteed avalanche initiation window; ensures predictable turn-on across production lot. |
| VC @ IPPM | 14.4 V at 41.7 A - clamped voltage during full 600 W surge; determines protected circuit's maximum overvoltage exposure. |
| PPPM | 600 W (10/1000 µs) - peak transient energy absorption capacity; validates compliance with IEC 61000-4-5 Level 4. |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage at rated stand-off; preserves signal integrity and minimizes standby power loss. |
| TJ max. | +150 °C - maximum junction temperature; enables use in high-ambient environments like motor drives or base stations. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with JEDEC MS-012AC. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during positive transient | One side of symmetrical PN junction; conducts when voltage exceeds +VBR relative to cathode. |
| Cathode | Current entry terminal during negative transient | Other side of symmetrical junction; conducts when voltage exceeds –VBR relative to anode - enables bidirectional clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or ungrounded lines without external polarity management. |
| 600 W peak pulse power | Meets IEC 61000-4-5 surge immunity requirements for industrial and telecom infrastructure applications. |
| Halogen-free & RoHS-compliant (HM3) | Complies with environmental regulations and supports lead-free reflow assembly without compromising reliability. |
| AEC-Q101 qualified option | HM3 suffix denotes automotive-grade qualification - validated for stress testing including HTRB, HTGB, and TCT. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on downstream components compared to higher-ratio TVS devices. |
Applications
| Industrial Motor Control | Telecom Line Interface |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensors against inductive kickback from relay or solenoid switching. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across MOSFET gate-source or op-amp input pins. Use Value: Limits transient overshoot to ≤14.4 V, preventing gate oxide rupture or comparator latch-up during 600 W surge events. |
Use Scenario: Surge suppression on Ethernet PHY differential pairs or analog telephone line interfaces exposed to lightning-induced transients. IC Role / Device Role / Timing Role: Symmetrical shunt element across balanced signal lines to clamp common-mode and differential-mode surges. Use Value: Maintains signal integrity by clamping within 1.5 ns response time while adding <10 pF capacitance at 0 V bias. |
| Automotive Body Control Module | Consumer Sensor Hub |
Use Scenario: ESD and load-dump protection for LIN bus transceivers and LED driver ICs in cabin electronics. IC Role / Device Role / Timing Role: AEC-Q101-qualified TVS mounted directly at connector entry points on PCB. Use Value: Withstands 100 A/8.3 ms surge (IFSM) and meets ISO 7637-2 Pulse 5a requirements due to robust thermal design. |
Use Scenario: Overvoltage safeguard for I²C/SPI lines connecting MEMS accelerometers, gyroscopes, and ambient light sensors. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) bidirectional clamp placed adjacent to sensor IC pins. Use Value: Prevents false triggering or damage during human-body-model ESD events while avoiding DC loading of high-impedance sensor outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CAHE3/I | Same electrical specs, but RoHS-compliant without halogen-free certification (E3 vs HM3). | Lacks halogen-free compliance; not suitable for strict green procurement mandates. | Select when AEC-Q101 qualification is required but halogen-free material is not mandated. |
| SMAJ8.5CA | Lower PPPM (400 W), larger VBR tolerance (±10%), SMA package (smaller thermal mass). | Reduced surge margin; unsuitable for IEC 61000-4-5 Level 4 or high-reliability industrial use. | Choose only for cost-sensitive, low-energy consumer applications where 600 W headroom is unnecessary. |
Compared with SMBJ8.5CAHE3/I, the SMBJ8.5CAHM3/I adds halogen-free assurance without sacrificing clamping performance or AEC-Q101 qualification; versus SMAJ8.5CA, it provides 50% higher surge power rating and tighter VBR control - critical for protecting sensitive analog front-ends in harsh environments.
Availability
SMBJ8.5CAHM3/I is available at Aetrix Electronics and suitable for industrial motor control, telecom line interface, and automotive body electronics requiring stable component supply with halogen-free and AEC-Q101-compliant TVS protection.
Supply support for SMBJ8.5CAHM3/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, efficiency, and application-specific optimization.
The SMBJ series targets high-energy transient suppression in space-constrained SMT designs, balancing surge robustness, thermal performance, and manufacturability for industrial, automotive, and communications systems.
FAQ
What does the "HM3" suffix indicate for SMBJ8.5CAHM3/I?
The HM3 suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. This means SMBJ8.5CAHM3/I meets automotive-grade reliability testing (including temperature cycling and humidity bias) while using environmentally compliant materials - distinct from E3 (RoHS only) or HE3 (AEC-Q101 + RoHS, but not halogen-free). The "I" indicates 13-inch tape-and-reel packaging (3200 units per reel).
Is SMBJ8.5CAHM3/I unidirectional or bidirectional?
SMBJ8.5CAHM3/I is a bidirectional TVS diode, as confirmed by the "CA" suffix in its part number. It provides symmetrical clamping in both polarities, making it suitable for protecting AC-coupled circuits, differential signal lines, or floating nodes where polarity reversal may occur - unlike unidirectional variants (e.g., SMBJ8.5A) that require correct orientation during placement.
What is the maximum clamping voltage VC for SMBJ8.5CAHM3/I, and under what test condition?
The maximum clamping voltage VC for SMBJ8.5CAHM3/I is 14.4 V, measured at a peak pulse current IPPM of 41.7 A using a 10/1000 µs double-exponential waveform. This value represents the worst-case voltage seen by protected circuitry during a full 600 W transient event, and is guaranteed across the operating temperature range per Vishay's datasheet specification.
Does SMBJ8.5CAHM3/I have a defined polarity marking on the package?
No - SMBJ8.5CAHM3/I has no polarity marking because it is a bidirectional device. Unlike unidirectional SMBJ parts (which feature a cathode band), the SMBJ8.5CAHM3/I case is unmarked, reflecting its symmetrical internal structure. PCB layout must treat both terminals as functionally identical; no orientation dependency exists during placement.
How does the thermal resistance of SMBJ8.5CAHM3/I impact PCB layout?
SMBJ8.5CAHM3/I has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, meaning effective heat transfer relies on direct copper pad conduction to PCB ground planes. For reliable 600 W surge handling, Vishay specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - undersized pads will cause excessive junction temperature rise and potential failure during repetitive surges.
SMBJ8.5CAHM3/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):
- 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/I FAQ
1.How can I place an order for SMBJ8.5CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CAHM3/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/I reliable?
The price and inventory of SMBJ8.5CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CAHM3/I?
SMBJ8.5CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CAHM3/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/I?
For technical support, including SMBJ8.5CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CAHM3/I requirements.
6.How does Aetrix verify that SMBJ8.5CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CAHM3/I?
All SMBJ8.5CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMBJ8.5CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5CAHM3/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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