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Vishay General Semiconductor - Diodes Division SMBJ8.5AHM3/I
- Part No.:
- SMBJ8.5AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5AHM3/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,468
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Product details
Overview
SMBJ8.5AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails 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 ECUs, industrial sensor interfaces, and USB power input stages.
For engineers reviewing the SMBJ8.5AHM3/I datasheet, SMBJ8.5AHM3/I pinout, SMBJ8.5AHM3/I application, or SMBJ8.5AHM3/I equivalent, this part delivers AEC-Q101-qualified surge immunity for 12 V automotive systems, low-leakage (<1.0 µA at VWM) operation, and halogen-free RoHS compliance - critical for high-reliability board-level ESD and load-dump protection design validation.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction for stable avalanche behavior under repetitive transients. Its thermal resistance (RθJA = 100 °C/W) and junction temperature range (–55 to +150 °C) support operation on standard PCB copper pads without heatsinking in ambient temperatures up to 85 °C.
The SMBJ8.5AHM3/I meets J-STD-020 MSL Level 1 moisture sensitivity and withstands 100 A non-repetitive forward surge (8.3 ms half-sine), enabling use in circuits exposed to ISO 7637-2 Pulse 1, 2a, and 5a transients. Its 0.073 %/°C VBR temperature coefficient ensures predictable clamping across automotive thermal profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before significant leakage; matches 12 V nominal rail with margin for ripple and tolerance. |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system noise floor. |
| VC @ IPPM | 14.4 V at 41.7 A - Clamped voltage during 10/1000 µs surge; protects downstream 16 V-rated ICs like CAN transceivers. |
| PPPM | 600 W - Peak pulse power handling per single transient; sufficient for ISO 16750-2 load-dump simulation. |
| ID @ VWM | <1.0 µA - Ultra-low reverse leakage at rated stand-off; avoids battery drain in always-on automotive modules. |
| TJ max. | +150 °C - Maximum junction temperature; supports under-hood deployment without derating at 85 °C ambient. |
| Package | SMB (DO-214AA) - Standardized 2-pin SMD outline (5.21 mm × 4.06 mm × 2.20 mm); compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity marked by cathode band. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or return path; defines clamping reference for positive transients on cathode side. |
| Cathode | Protected line input | Connected to supply rail or signal line; absorbs surge energy when voltage exceeds VBR, shunting current to anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for ECU and ADAS module qualification. |
| Halogen-free & RoHS-compliant | HM3 suffix denotes halogen-free molding compound and lead-free terminations - satisfies EU ELV and China RoHS environmental mandates. |
| 600 W 10/1000 µs rating | Handles high-energy transients such as ISO 7637-2 Pulse 5a (load dump) without degradation - eliminates need for external series impedance in many designs. |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes overvoltage stress on protected ICs; enables tighter margin between VC and IC absolute maximum ratings. |
| MSL Level 1 | Unlimited floor life at ≤30 °C/60 % RH; no baking required prior to assembly - reduces manufacturing overhead and moisture-related defects. |
Applications
| Automotive Body Control Module (BCM) | Industrial RS-485 Sensor Node |
|---|---|
|
Use Scenario: Protecting 12 V power input of BCM microcontroller and CAN transceiver against load-dump transients up to 35 V. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed directly at connector entry point, referenced to chassis ground. Use Value: Limits voltage seen by TJA1055T CAN transceiver (max 36 V) to ≤14.4 V during 10/1000 µs surges, preventing latch-up or permanent damage. |
Use Scenario: Safeguarding RS-485 transceiver (e.g., SN65HVD72) power pins against ESD and inductive switching noise in factory-floor PLC networks. IC Role / Device Role / Timing Role: Standoff-rated TVS on VCC rail, positioned upstream of local LDO regulator. Use Value: Suppresses 8 kV contact ESD events (IEC 61000-4-2) with sub-nanosecond response, maintaining bus uptime without reset or communication loss. |
| USB-C Power Delivery Input Stage | Smart Meter DC Power Supply |
|
Use Scenario: Overvoltage protection for 5–20 V USB-C PD input circuitry subjected to hot-plug transients and cable-induced ringing. IC Role / Device Role / Timing Role: Primary clamping element on VBUS line, coordinated with upstream eFuse and downstream buck converter. Use Value: Clamps 100 V/10 µs spikes to ≤14.4 V within <1 ps, preserving integrity of USB PD controller (e.g., FUSB302) and Type-C port logic. |
Use Scenario: Securing 3.3 V or 5 V auxiliary supply derived from AC/DC converter in utility smart meters exposed to lightning-induced surges on mains-connected PCBs. IC Role / Device Role / Timing Role: Secondary-stage TVS on isolated DC output, placed after transformer and rectifier but before linear regulator. Use Value: Absorbs 600 W surge energy without failure, meeting IEC 61000-4-5 Level 3 (2 kV line-earth) requirements for meter certification. |
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/I | Same electrical specs, but RoHS-compliant (non-halogen-free) and commercial-grade (not AEC-Q101 qualified). | Lacks automotive qualification; unsuitable for under-hood or safety-critical modules requiring AEC-Q101 evidence. | Select SMBJ8.5AHM3/I when AEC-Q101 compliance and halogen-free materials are mandatory per OEM specification. |
| SMAJ8.5A-M3 | Lower 400 W PPPM, SMA (DO-214AC) package (smaller footprint, higher RθJA = 140 °C/W), same VWM/VC. | Reduced surge handling and thermal performance; limited to lower-energy transients or space-constrained consumer PCBs. | Choose SMBJ8.5AHM3/I for full 600 W capability and automotive thermal robustness where board area permits SMB outline. |
Compared with SMBJ8.5AHE3/I, the SMBJ8.5AHM3/I adds halogen-free construction and AEC-Q101 qualification without trade-offs in clamping or surge rating; versus SMAJ8.5A-M3, it provides 50 % higher pulse power and superior thermal dissipation in a slightly larger but industry-standard SMB package.
Availability
SMBJ8.5AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and USB-C power delivery systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for SMBJ8.5AHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where consistent clamping, low leakage, and qualification-grade consistency are non-negotiable.
FAQ
What is the maximum clamping voltage of SMBJ8.5AHM3/I and under what test condition?
The SMBJ8.5AHM3/I has a maximum clamping voltage (VC) of 14.4 V, measured at a peak pulse current (IPPM) of 41.7 A using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed per Vishay's datasheet revision 09-Jan-2024 (Document Number: 88392) and reflects worst-case clamping behavior during surge events - critical for verifying compatibility with downstream IC voltage tolerances in the SMBJ8.5AHM3/I application circuit.
Is SMBJ8.5AHM3/I suitable for automotive applications?
Yes, SMBJ8.5AHM3/I is AEC-Q101 qualified and specifically designated for automotive use via the HM3 suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It meets requirements for under-hood and body electronics, including temperature cycling, high-temperature reverse bias, and surge endurance testing - making it appropriate for engine control units, lighting modules, and infotainment power supplies where SMBJ8.5AHM3/I reliability is essential.
What does the "HM3" suffix mean in SMBJ8.5AHM3/I?
The "HM3" suffix in SMBJ8.5AHM3/I indicates halogen-free, RoHS-compliant construction with matte tin-plated leads, and AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., E3 or M3) and confirms compliance with automotive environmental and reliability standards - a key identifier when selecting the correct SMBJ8.5AHM3/I for certified designs.
How does SMBJ8.5AHM3/I compare to bidirectional TVS diodes like SMBJ8.5CA?
The SMBJ8.5AHM3/I is unidirectional and intended for DC rail protection with defined polarity (cathode-band marking), whereas SMBJ8.5CA is bidirectional and used for AC or symmetrical signal-line protection. SMBJ8.5AHM3/I offers lower leakage (<1.0 µA) and higher surge current capability in its rated direction, but cannot clamp negative transients - selection depends strictly on circuit topology and SMBJ8.5AHM3/I must be oriented correctly in the schematic.
What is the thermal resistance and maximum junction temperature of SMBJ8.5AHM3/I?
The SMBJ8.5AHM3/I 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, and a maximum junction temperature (TJ) of +150 °C. These values enable reliable operation in sealed enclosures or high-ambient environments - confirming that SMBJ8.5AHM3/I remains within safe thermal limits even during repeated surge events in industrial or automotive deployments.
SMBJ8.5AHM3/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:
- 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/I FAQ
1.How can I place an order for SMBJ8.5AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5AHM3/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/I reliable?
The price and inventory of SMBJ8.5AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMBJ8.5AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5AHM3/I?
SMBJ8.5AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5AHM3/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/I?
For technical support, including SMBJ8.5AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5AHM3/I requirements.
6.How does Aetrix verify that SMBJ8.5AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMBJ8.5AHM3/I?
All SMBJ8.5AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5AHM3/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/I part is unused and in its original packaging.
Return procedure for SMBJ8.5AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5AHM3/I Tags
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