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Vishay General Semiconductor - Diodes Division SMBJ8.5AHM3_B/I
- Part No.:
- SMBJ8.5AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5AHM3_B/I.pdf
- Description:
- 600W,8.5V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,503
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Product details
Overview
SMBJ8.5AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ8.5AHM3_B/I datasheet, SMBJ8.5AHM3_B/I pinout, SMBJ8.5AHM3_B/I application, or SMBJ8.5AHM3_B/I equivalent, this page delivers verified electrical specs, thermal derating behavior, AEC-Q101 qualification status, halogen-free RoHS compliance, and real-world clamping performance under surge conditions.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its VBR threshold. Its low incremental surge resistance (typical <0.3 Ω) and sub-nanosecond response time ensure effective suppression of ESD, lightning-induced surges, and inductive switching transients.
Designed for PCB-level protection, it complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) standards. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - validated for automotive-grade reliability in engine control units and body electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 8.5 V - Maximum continuous reverse operating voltage before conduction begins; sets safe margin below system rail. |
| VBR (Breakdown Voltage) | 9.44–10.4 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 14.4 V at 41.7 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; limits stress on downstream ICs. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capability per transient; enables robust protection in 24 V industrial systems. |
| IPPM (Peak Pulse Current) | 41.7 A - Maximum non-repetitive surge current handled without degradation; validated per Fig. 1 & 3 in datasheet. |
| TJmax | 150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| Leakage (ID) | 20 µA max at VWM - Low reverse leakage preserves efficiency in always-on power rails. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VWM exceeded. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lower-potential rail; completes clamping path during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain and chassis modules; meets stress test requirements for temperature cycling, HTRB, and surge life. |
| Halogen-free & RoHS-compliant (HM3) | Meets JEDEC J-STD-20 MSL Level 1 (260 °C peak reflow); eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating. |
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges on 24 V DC lines without external series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients; critical for safeguarding 12–24 V logic interfaces and gate drivers. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling; prevents moisture ingress and parametric drift. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protects microcontroller GPIOs and CAN transceiver power rails from load dump and alternator ripple in BCMs. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 12 V supply and ground, upstream of LDO regulators. Use Value: Limits transient voltage to ≤14.4 V during 100 V/50 ms load dump events, preventing latch-up in 5 V logic circuits. |
Use Scenario: Shields 24 V digital input channels from field-wiring induced surges in programmable logic controllers. IC Role / Device Role / Timing Role: Standoff-clamp device installed across input terminals, shunting surge current away from optocoupler input stages. Use Value: Absorbs 41.7 A surges without failure, maintaining channel integrity during factory floor EFT bursts (IEC 61000-4-4). |
| Automotive Sensor Signal Line Protection | DC-DC Converter Input Stage Clamp |
|
Use Scenario: Safeguards analog outputs of pressure/temperature sensors connected to ECU via long harnesses. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS placed at connector interface to suppress coupled transients before signal conditioning. Use Value: Clamps induced spikes to <15 V while adding <10 pF capacitance - preserving bandwidth of 0–10 kHz sensor signals. |
Use Scenario: Prevents overvoltage damage to buck controller ICs during input capacitor discharge or hot-swap events. IC Role / Device Role / Timing Role: Primary clamping device across 48 V input rail, coordinated with upstream fuse and common-mode choke. Use Value: Handles 600 W surge energy without thermal runaway, enabling compact input protection in space-constrained telecom power supplies. |
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_B/I | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3). | Lacks AEC-Q101 qualification; suitable for commercial-grade industrial use only. | Select when halogen-free requirement is waived and automotive qualification is unnecessary. |
| SMBJ8.5CAHM3_B/I | Bidirectional variant; symmetric VBR (±9.44–10.4 V); no polarity marking. | Required for AC-coupled or floating signal lines (e.g., RS-485, USB D+/D−) where bidirectional clamping is mandatory. | Choose only if protecting differential or AC-signaled paths; not drop-in for unidirectional rails. |
Compared with SMBJ8.5AHM3_B/I, the E3 variant trades halogen-free construction for cost-sensitive commercial designs, while the CAHM3 variant shifts from unidirectional to bidirectional clamping - requiring layout changes and altering protection topology for AC or symmetrical transients.
Availability
SMBJ8.5AHM3_B/I is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and DC-DC converter designs requiring stable component supply, AEC-Q101 validation, and halogen-free compliance.
Supply support for SMBJ8.5AHM3_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, power handling, and automotive qualification.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where consistent clamping performance and long-term stability are critical.
FAQ
What is the maximum clamping voltage of SMBJ8.5AHM3_B/I under standard test conditions?
The SMBJ8.5AHM3_B/I has a maximum clamping voltage (VC) of 14.4 V when subjected to a 10/1000 µs surge waveform at 41.7 A peak pulse current. This value is measured per Figure 1 and Table on page 2 of Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMBJ8.5AHM3_B/I qualified for automotive applications?
Yes, SMBJ8.5AHM3_B/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix and footnote (1) on page 3 of the Vishay datasheet. This qualification covers temperature cycling, high-temperature reverse bias, and surge lifetime testing - making SMBJ8.5AHM3_B/I suitable for engine control units, body electronics, and ADAS power domains.
How does the HM3 suffix differ from E3 or M3 in SMBJ8.5AHM3_B/I?
The HM3 suffix in SMBJ8.5AHM3_B/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. In contrast, E3 is RoHS-compliant but contains halogens and lacks automotive qualification; M3 is halogen-free and RoHS-compliant but not AEC-Q101 rated. Only HM3 satisfies all three criteria simultaneously.
What is the thermal resistance from junction to ambient for SMBJ8.5AHM3_B/I?
The typical junction-to-ambient thermal resistance (RθJA) of SMBJ8.5AHM3_B/I is 100 °C/W when mounted on minimum recommended pad layout (0.2" × 0.2" copper pads per terminal), per Thermal Characteristics table on page 3 of Vishay document 88392. This value guides heatsinking decisions for repetitive surge duty cycles.
Can SMBJ8.5AHM3_B/I be used in bidirectional signal protection?
No, SMBJ8.5AHM3_B/I is a unidirectional TVS diode - its cathode band indicates polarity, and it conducts only in reverse bias. For bidirectional protection (e.g., RS-485, USB, or AC lines), the SMBJ8.5CAHM3_B/I variant must be used, which provides symmetrical clamping in both directions and carries no polarity marking.
SMBJ8.5AHM3_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:
- 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_B/I FAQ
1.How can I place an order for SMBJ8.5AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5AHM3_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 SMBJ8.5AHM3_B/I reliable?
The price and inventory of SMBJ8.5AHM3_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 SMBJ8.5AHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ8.5AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5AHM3_B/I?
SMBJ8.5AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5AHM3_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 SMBJ8.5AHM3_B/I?
For technical support, including SMBJ8.5AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5AHM3_B/I requirements.
6.How does Aetrix verify that SMBJ8.5AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5AHM3_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 SMBJ8.5AHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ8.5AHM3_B/I?
All SMBJ8.5AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5AHM3_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 SMBJ8.5AHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ8.5AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5AHM3_B/I Tags
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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