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Vishay General Semiconductor - Diodes Division SMBJ8.5AHM3_A/H
- Part No.:
- SMBJ8.5AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5AHM3_A/H.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,006
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Product details
Overview
SMBJ8.5AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping fast-rising ESD and surge transients on power and signal 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, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and DC power rail surge suppression.
For engineers reviewing the SMBJ8.5AHM3_A/H datasheet, SMBJ8.5AHM3_A/H pinout, SMBJ8.5AHM3_A/H application, or SMBJ8.5AHM3_A/H equivalent, key selection criteria include verified unidirectional polarity, AEC-Q101 qualification status (via HM3 suffix), clamping performance under 41.7 A surge, thermal resistance (RθJA = 100 °C/W), and halogen-free RoHS compliance per Vishay's HM3 commercial-grade specification.
Technical Context
This TVS diode operates as a voltage-clamping protection device placed in parallel with sensitive circuit nodes. Its glass-passivated junction enables sub-nanosecond response to transients, while the low incremental surge resistance ensures minimal voltage overshoot during 10/1000 µs surges up to 41.7 A. The device is rated for continuous operation from −55 °C to +150 °C junction temperature.
Designed for automated SMT assembly, SMBJ8.5AHM3_A/H uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, meets MSL Level 1 per J-STD-020, and supports reflow peak temperatures up to 260 °C. Its cathode band marking identifies polarity for unidirectional configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum reverse working voltage before leakage exceeds 1 µA; sets upper limit for normal operating bias without conduction. |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on above system overvoltage thresholds. |
| VC @ IPPM | 14.4 V at 41.7 A - Clamped voltage during 600 W 10/1000 µs surge; defines worst-case stress on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability; validates robustness against IEC 61000-4-5 Level 4 surges. |
| IFSM | 100 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports inrush or fault-current events on power rails. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive or high-ambient industrial environments. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on standard 0.2″ × 0.2″ copper pads; informs PCB thermal design requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with cathode band marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), 0.155″ × 0.130″ × 0.086″.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential side of protected line. | Provides path for surge current to ground when cathode is held at higher potential - essential for correct unidirectional clamping orientation. |
| Cathode | Current exit terminal in forward bias; marked by band; connected to higher-potential side or VCC. | Defines polarity-sensitive placement; reverse connection disables clamping function and risks catastrophic failure under surge. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates immunity to IEC 61000-4-5 surge test waveforms without degradation - critical for industrial fieldbus and automotive power inputs. |
| AEC-Q101 qualified (HM3 suffix) | Confirms reliability for automotive applications including engine control modules, body electronics, and ADAS sensor interfaces. |
| Halogen-free, RoHS-compliant | Meets environmental compliance requirements for global OEM supply chains and end-of-life recycling mandates. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free reflow assembly without moisture-related popcorning or delamination. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term leakage stability across temperature and lifetime - vital for safety-critical protection. |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load dump and ESD in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor signal line and ground, clamping transients before they reach input pins of ASICs or microcontrollers. Use Value: Limits induced voltage to ≤14.4 V during 41.7 A surges, preventing latch-up or gate oxide damage in automotive-grade MCUs with 16 V absolute max ratings. |
Use Scenario: Safeguarding 24 V DC digital input channels on programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on each input channel, referenced to common ground, activated within <1 ns of overvoltage onset. Use Value: Maintains functional integrity under repeated 600 W surges per IEC 61000-4-4, eliminating false triggering and extending maintenance intervals. |
| DC Power Rail Surge Suppression | Consumer Device USB Port ESD Protection |
|
Use Scenario: Secondary-side overvoltage clamping on 5–12 V DC-DC converter outputs feeding FPGAs, memory, or display drivers. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 8.5 V) placed between output rail and ground to absorb switching noise and coupling spikes. Use Value: Clamps transients to 14.4 V while drawing <1 µA at nominal 8.5 V, avoiding regulation loss or efficiency penalty during steady-state operation. |
Use Scenario: Board-level ESD protection on USB 2.0 VBUS and D+/D− lines in portable medical monitors and smart home hubs. IC Role / Device Role / Timing Role: Discrete unidirectional TVS on VBUS line only (cathode to VBUS, anode to ground), complementing bidirectional arrays on data lines. Use Value: Withstands ±15 kV contact discharge (IEC 61000-4-2) without parameter shift, preserving USB enumeration reliability after repeated human-hand ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5AHE3_A/H | Same electrical specs and SMB package, but RoHS-compliant (E3) instead of halogen-free (HM3); no AEC-Q101 qualification. | Approved for commercial-grade industrial and consumer systems; not certified for automotive under hood or chassis locations. | Select SMBJ8.5AHE3_A/H when AEC-Q101 is not required and halogen-free material is not mandated by OEM spec. |
| SMAJ8.5A-M3 | Lower 400 W PPPM, SMA (DO-214AC) package (smaller footprint, higher RθJA = 140 °C/W), same VWM/VC ratings. | Suitable for space-constrained consumer PCBs with lower surge threat levels; derates faster above 25 °C ambient. | Choose SMAJ8.5A-M3 only if board area is critical and surge exposure is limited to IEC 61000-4-2 ESD, not 4-5 surges. |
Compared with SMBJ8.5AHE3_A/H and SMAJ8.5A-M3, SMBJ8.5AHM3_A/H uniquely combines AEC-Q101 qualification, halogen-free construction, and full 600 W surge capacity in the SMB outline - making it the only option qualified for automotive power domain protection where both reliability and regulatory compliance are mandatory.
Availability
SMBJ8.5AHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC digital inputs, and DC power rail surge suppression requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMBJ8.5AHM3_A/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, precision, and application-specific validation.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial automation, and telecom infrastructure where sustained surge immunity and AEC-Q101 compliance are non-negotiable.
FAQ
What is the clamping voltage of SMBJ8.5AHM3_A/H at its rated peak pulse current?
The SMBJ8.5AHM3_A/H has a maximum clamping voltage (VC) of 14.4 V at its rated peak pulse current (IPPM) of 41.7 A, measured using the standardized 10/1000 µs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is confirmed in Vishay's datasheet revision 09-Jan-2024, page 2. The SMBJ8.5AHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMBJ8.5AHM3_A/H qualified for automotive applications?
Yes, SMBJ8.5AHM3_A/H is AEC-Q101 qualified, as indicated by the "HM3" suffix in its part number - denoting halogen-free, RoHS-compliant, and automotive-grade construction. This qualification covers stress tests including high-temperature operating life, temperature cycling, and surge robustness, enabling use in engine control units, body control modules, and ADAS sensor interfaces. The SMBJ8.5AHM3_A/H meets the reliability requirements for under-hood and chassis-mounted electronics per AEC-Q101 Rev D.
What does the "HM3" suffix mean in SMBJ8.5AHM3_A/H?
The "HM3" suffix in SMBJ8.5AHM3_A/H specifies halogen-free, RoHS-compliant, commercial-grade construction with AEC-Q101 qualification. It distinguishes the part from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS) variants. The "H" denotes AEC-Q101 qualification, "M" indicates halogen-free molding compound, and "3" confirms JEDEC-standard packaging. This suffix ensures SMBJ8.5AHM3_A/H complies with automotive OEM material declarations and environmental directives such as ELV and REACH.
Can SMBJ8.5AHM3_A/H be used in bidirectional configurations?
No, SMBJ8.5AHM3_A/H is a unidirectional TVS diode, as confirmed by its part number ending in "A" (not "CA") and its specified polarity - cathode band marking and forward surge rating (IFSM = 100 A). Bidirectional operation requires a "CA" suffix variant (e.g., SMBJ8.5CA), which lacks forward surge rating and exhibits symmetrical breakdown in both directions. Using SMBJ8.5AHM3_A/H in bidirectional circuits will result in improper clamping and potential failure during negative transients.
What is the thermal resistance of SMBJ8.5AHM3_A/H, and how does it affect layout?
SMBJ8.5AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay's datasheet. This value directly impacts PCB layout: reducing pad size or omitting thermal vias increases junction temperature during repetitive surges, potentially derating peak power or shortening lifetime. For sustained surge duty, designers must allocate adequate copper area and consider RθJL = 20 °C/W to optimize heat transfer to the PCB plane.
SMBJ8.5AHM3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ8.5AHM3_A/H FAQ
1.How can I place an order for SMBJ8.5AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5AHM3_A/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 SMBJ8.5AHM3_A/H reliable?
The price and inventory of SMBJ8.5AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ8.5AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5AHM3_A/H?
SMBJ8.5AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5AHM3_A/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 SMBJ8.5AHM3_A/H?
For technical support, including SMBJ8.5AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5AHM3_A/H requirements.
6.How does Aetrix verify that SMBJ8.5AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5AHM3_A/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 SMBJ8.5AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ8.5AHM3_A/H?
All SMBJ8.5AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5AHM3_A/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 SMBJ8.5AHM3_A/H part is unused and in its original packaging.
Return procedure for SMBJ8.5AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5AHM3_A/H Tags
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