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Vishay General Semiconductor - Diodes Division SMBJ8.5AHM3_A/I
- Part No.:
- SMBJ8.5AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5AHM3_A/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,687
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Product details
Overview
SMBJ8.5AHM3_A/I 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 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 power supplies and automotive control modules.
For engineers reviewing the SMBJ8.5AHM3_A/I datasheet, SMBJ8.5AHM3_A/I pinout, SMBJ8.5AHM3_A/I application, or SMBJ8.5AHM3_A/I equivalent, key selection criteria include verified unidirectional polarity, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), MSL Level 1 moisture sensitivity, and thermal resistance (RθJA = 100 °C/W) under standard PCB pad layout.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold (VBR), diverting transient energy away from downstream circuitry. Its low incremental surge resistance and sub-nanosecond response time ensure effective suppression of ESD (IEC 61000-4-2) and lightning-induced surges (IEC 61000-4-5).
The SMBJ8.5AHM3_A/I is rated for 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports operating junction temperatures from –55 °C to +150 °C, and exhibits a positive temperature coefficient of VBR (+0.073 %/°C), enabling stable clamping performance across thermal gradients in embedded power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC bias margin for protected line. |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction during normal operation. |
| VC @ IPPM | 14.4 V at 41.7 A - Clamping voltage under 10/1000 µs surge; determines maximum stress imposed on downstream ICs during transient events. |
| PPPM | 600 W - Peak pulse power handling capability with 10/1000 µs waveform; validates suitability for IEC 61000-4-5 Level 3/4 surge immunity. |
| ID @ VWM | 20 µA max - Reverse leakage at stand-off voltage; low value minimizes quiescent power loss and avoids false triggering in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive and industrial environments with elevated ambient conditions. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.21 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), unidirectional configuration with cathode band marking on one end. Matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability standards. MSL Level 1 per J-STD-020; peak reflow temperature 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return plane; completes clamping loop during transient events. |
| Cathode | Protected line connection / Surge sink | Connected to line being protected (e.g., 12 V rail or sensor output); conducts avalanche current when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates robustness against repetitive surge events in industrial motor drives and automotive power distribution units. |
| AEC-Q101 qualified (HM3 suffix) | Confirms reliability for automotive applications including body control modules and infotainment power inputs. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for EU and global electronics manufacturing without compromising thermal or electrical performance. |
| Low clamping voltage (14.4 V @ 41.7 A) | Ensures protected ICs (e.g., microcontrollers with 16 V absolute max rating) remain within safe operating limits during surge events. |
| MSL Level 1, 260 °C peak reflow | Eliminates pre-baking requirement and supports standard lead-free SMT assembly processes without moisture-related defects. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 12 V battery-fed ECUs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp transients before they reach LDOs and MCU power pins. Use Value: Withstands 600 W surges and clamps to ≤14.4 V, preventing latch-up or overvoltage damage to 5 V/3.3 V logic rails downstream. |
Use Scenario: Analog output lines from pressure/temperature sensors in PLC I/O modules. IC Role / Device Role / Timing Role: TVS mounted at connector interface to shunt ESD strikes (±8 kV contact) before reaching ADC front-end or op-amp buffers. Use Value: Sub-nanosecond response and 20 µA leakage preserve signal integrity while meeting IEC 61000-4-2 Level 4 immunity requirements. |
| DC-DC Converter Output Rail Protection | USB Power Delivery Interface Protection |
|
Use Scenario: 5 V/12 V outputs of isolated flyback converters powering fieldbus nodes. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing coupled transients from primary-side switching noise or secondary-side load steps. Use Value: 100 °C/W RθJA allows thermal management on standard 2-layer PCBs without heatsinking; 150 °C TJ rating sustains operation during sustained overload. |
Use Scenario: VBUS line in USB-C PD ports subject to hot-plug surges and cable-induced transients. IC Role / Device Role / Timing Role: Standoff voltage (8.5 V) aligns with USB PD 5 V/9 V/15 V profiles; clamps surges before reaching PD controller and port protection ICs. Use Value: Halogen-free HM3 construction meets strict material requirements for consumer electronics; SMB footprint enables compact placement near connector. |
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/I | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification; same VWM/VBR/VC/PPPM specs. | Suitable for commercial-grade industrial equipment where automotive qualification is not required. | Select when halogen-free content or automotive qualification is not mandated by system-level compliance. |
| SMBJ8.5CAHM3_A/I | Bidirectional variant; identical VWM (8.5 V), but symmetric clamping in both polarities; VC = 14.4 V same magnitude. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal may occur. | Choose only if bidirectional protection is needed; unidirectional SMBJ8.5AHM3_A/I is optimal for DC power rails with defined polarity. |
Compared with SMBJ8.5AHE3_A/I, the SMBJ8.5AHM3_A/I adds halogen-free materials and AEC-Q101 qualification without sacrificing electrical performance; versus SMBJ8.5CAHM3_A/I, it provides lower capacitance and optimized clamping for fixed-polarity DC lines, avoiding unnecessary complexity in unidirectional applications.
Availability
SMBJ8.5AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, DC-DC converter outputs, and USB-C PD power delivery systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ8.5AHM3_A/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial automation, and telecom infrastructure where failure resilience and regulatory compliance are critical.
FAQ
What is the maximum clamping voltage of SMBJ8.5AHM3_A/I under surge conditions?
The SMBJ8.5AHM3_A/I has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 41.7 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for downstream components such as microcontrollers or voltage regulators in the SMBJ8.5AHM3_A/I protected circuit.
Is SMBJ8.5AHM3_A/I qualified for automotive applications?
Yes, SMBJ8.5AHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix in its ordering code. This certification confirms its reliability for automotive use cases including engine control units, body electronics, and infotainment power supplies. The qualification covers temperature cycling, humidity testing, mechanical shock, and accelerated life testing per the AEC-Q101 standard - all validated for the SMBJ8.5AHM3_A/I device.
What does the "HM3" suffix mean in SMBJ8.5AHM3_A/I?
The "HM3" suffix in SMBJ8.5AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from "E3" (RoHS only) and "HE3" (RoHS + AEC-Q101, but not halogen-free). The "A/I" further specifies packaging: "A" is the revision code, and "I" indicates 13-inch tape-and-reel delivery (3200 units per reel), confirming full traceability and production readiness for the SMBJ8.5AHM3_A/I.
Can SMBJ8.5AHM3_A/I be used in bidirectional signal protection?
No - SMBJ8.5AHM3_A/I is a unidirectional TVS diode, intended for DC power line or single-polarity signal protection where the cathode is connected to the protected line and anode to ground. For bidirectional applications like RS-485 or CAN bus, the SMBJ8.5CAHM3_A/I variant must be used instead. Using SMBJ8.5AHM3_A/I on AC or polarity-agnostic lines risks failure during negative transients, as it does not conduct in reverse bias beyond its specified leakage.
What is the thermal resistance of SMBJ8.5AHM3_A/I, and how does it affect PCB layout?
The SMBJ8.5AHM3_A/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. This value assumes minimum recommended pad layout per Vishay's datasheet; reducing pad area increases thermal impedance and risks exceeding the +150 °C maximum junction temperature during repeated surges. Proper copper pour and thermal vias are recommended for high-duty-cycle applications using SMBJ8.5AHM3_A/I.
SMBJ8.5AHM3_A/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:
- 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/I FAQ
1.How can I place an order for SMBJ8.5AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5AHM3_A/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_A/I reliable?
The price and inventory of SMBJ8.5AHM3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ8.5AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5AHM3_A/I?
SMBJ8.5AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5AHM3_A/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_A/I?
For technical support, including SMBJ8.5AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5AHM3_A/I requirements.
6.How does Aetrix verify that SMBJ8.5AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5AHM3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ8.5AHM3_A/I?
All SMBJ8.5AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5AHM3_A/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_A/I part is unused and in its original packaging.
Return procedure for SMBJ8.5AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5AHM3_A/I Tags
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Diodes Incorporated
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