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Vishay General Semiconductor - Diodes Division SMBJ8.5AHM3/H
- Part No.:
- SMBJ8.5AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5AHM3/H.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,168
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Product details
Overview
SMBJ8.5AHM3/H 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 sensitive electronics. 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, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines of automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMBJ8.5AHM3/H datasheet, SMBJ8.5AHM3/H pinout, SMBJ8.5AHM3/H application, or SMBJ8.5AHM3/H 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 transients induced by inductive switching and ESD events.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 8.5 V, it avalanches to limit transient energy via low dynamic impedance. Its 100 °C/W junction-to-ambient thermal resistance and 20 °C/W junction-to-lead resistance define its power dissipation limits under repetitive surges and PCB layout constraints.
The device meets J-STD-020 MSL Level 1, supports 260 °C lead-free reflow, and is qualified to AEC-Q101 for automotive use - confirmed by HM3 suffix and "HM3_B/H" ordering code. Its glass-passivated junction ensures stable leakage (<20 µA at VWM) and fast response time (<1 ns), critical for protecting MOSFET gates and microcontroller I/O pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system rail margin for reliable standby operation. |
| VBR @ IT = 1 mA | 9.44–10.4 V - Breakdown voltage range defining turn-on threshold; tight tolerance enables predictable surge initiation across temperature. |
| VC @ IPPM = 41.7 A | 14.4 V - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability; defines survivability against lightning-induced surges per IEC 61000-4-5. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against inrush or fault currents. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and high-ambient industrial enclosures. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band marking on one end; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes clamping path during reverse transient events. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 12 V rail or CAN_H); avalanche conduction occurs from cathode to anode when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant (HM3) | Meets IPC-1752A material declaration requirements and EU RoHS Directive 2011/65/EU without brominated flame retardants. |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surge (4 kV line-to-ground) without degradation when mounted on 5.0 mm × 5.0 mm copper pads. |
| Low clamping ratio (VC/VWM = 1.69) | Minimizes overvoltage overshoot during transients - critical for safeguarding 3.3 V or 5 V logic interfaces downstream of protection stage. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture-related popcorning or delamination risk. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 12 V battery-supplied ECU power input exposed to load-dump transients up to 35 V and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VBAT and GND to clamp surges before they reach DC/DC converter input. Use Value: Limits peak voltage to ≤14.4 V during 41.7 A surge, preventing damage to upstream LDOs and MCU power domains. |
Use Scenario: Analog output line (e.g., 4–20 mA current loop) from pressure sensor in factory automation PLC cabinet. IC Role / Device Role / Timing Role: TVS connected across signal and return lines to absorb ESD and inductive kickback from nearby solenoid switching. Use Value: Sub-1 ns response ensures clamping before transient couples into op-amp input stage, preserving measurement accuracy and ADC integrity. |
| Telecom Interface Surge Suppression | Consumer USB Port ESD Protection |
|
Use Scenario: RS-485 transceiver bus lines in outdoor network repeater subjected to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Paired unidirectional SMBJ8.5AHM3/H devices (one per line) referenced to local ground to suppress differential and common-mode transients. Use Value: 600 W rating handles multi-kV surges per IEC 61000-4-5; low leakage (<20 µA) avoids loading high-impedance receiver inputs. |
Use Scenario: VBUS line of USB 2.0 port on smart speaker exposed to human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Primary front-end TVS on 5 V supply rail to divert ±15 kV contact discharge energy away from USB controller and PMIC. Use Value: 14.4 V clamping prevents latch-up in 5 V tolerant USB PHY; halogen-free construction satisfies consumer product environmental compliance. |
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/H | Same electrical specs and SMB package, but RoHS-compliant commercial grade (E3) without halogen-free certification or AEC-Q101 qualification. | Approved for non-automotive industrial and computing applications where halogen-free and automotive qualification are not mandated. | Select when cost sensitivity outweighs automotive or green-material requirements; verify board-level reliability testing if used in harsh environments. |
| SMAJ8.5A-HF | Lower 400 W PPPM, SMA (DO-214AC) package (smaller footprint, lower thermal mass), same VWM/VC ratings. | Suitable for space-constrained consumer PCBs with lower surge immunity requirements (e.g., IEC 61000-4-2 only). | Choose for compact layouts where 600 W headroom is unnecessary; avoid in automotive or industrial settings requiring full IEC 61000-4-5 compliance. |
Compared with SMBJ8.5AHM3/H, the SMBJ8.5AHE3/H offers identical protection performance without halogen-free or automotive qualification, while the SMAJ8.5A-HF trades 33 % lower surge power and reduced thermal robustness for smaller size - making SMBJ8.5AHM3/H the optimal choice where AEC-Q101, halogen-free compliance, and full 600 W surge handling are mandatory.
Availability
SMBJ8.5AHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom infrastructure equipment, and consumer USB power protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SMBJ8.5AHM3/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, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in automotive, industrial, and communications systems - delivering consistent clamping performance, AEC-Q101 validation, and robust thermal design in standardized surface-mount packages.
FAQ
What is the maximum clamping voltage of SMBJ8.5AHM3/H under a 10/1000 µs surge?
The SMBJ8.5AHM3/H has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 41.7 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 12 V system components and 5 V logic interfaces downstream of the SMBJ8.5AHM3/H.
Is SMBJ8.5AHM3/H qualified for automotive applications?
Yes, SMBJ8.5AHM3/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and "HM3_B/H" ordering designation in Vishay's official documentation. This qualification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing - validating its suitability for under-hood and chassis-mounted automotive modules such as body control units and ADAS sensors.
What does the "HM3" suffix indicate for SMBJ8.5AHM3/H?
The "HM3" suffix in SMBJ8.5AHM3/H denotes halogen-free, RoHS-compliant construction meeting IPC-1752A material declaration standards, plus AEC-Q101 qualification. It distinguishes this variant from E3 (RoHS-only commercial grade) and HE3 (AEC-Q101 + RoHS, but not halogen-free). The "H" in the full part number specifies 7" tape-and-reel packaging (750 units per reel), essential for SMT production planning.
How does SMBJ8.5AHM3/H compare to bidirectional TVS diodes like SMBJ8.5CA?
SMBJ8.5AHM3/H is unidirectional and intended for DC line protection where polarity is fixed (e.g., 12 V supply rails), offering lower leakage and higher surge current capability than its bidirectional counterpart SMBJ8.5CA. The SMBJ8.5CA supports AC or floating-line applications but exhibits doubled reverse leakage above 10 V VWM; thus, SMBJ8.5AHM3/H is preferred for low-leakage DC protection in automotive and industrial power systems.
What PCB layout guidance applies to SMBJ8.5AHM3/H for optimal thermal performance?
For optimal thermal performance, Vishay specifies mounting SMBJ8.5AHM3/H on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 600 W pulse power. Reducing pad area increases junction temperature rise - e.g., halving pad size raises RθJA beyond 100 °C/W, risking thermal runaway during repetitive surges. Trace width and internal plane connectivity must also support ≥2 oz copper and thermal vias to minimize steady-state heating of the SMBJ8.5AHM3/H junction.
SMBJ8.5AHM3/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:
- 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/H FAQ
1.How can I place an order for SMBJ8.5AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5AHM3/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/H reliable?
The price and inventory of SMBJ8.5AHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMBJ8.5AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5AHM3/H?
SMBJ8.5AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5AHM3/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/H?
For technical support, including SMBJ8.5AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5AHM3/H requirements.
6.How does Aetrix verify that SMBJ8.5AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5AHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMBJ8.5AHM3/H?
All SMBJ8.5AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5AHM3/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/H part is unused and in its original packaging.
Return procedure for SMBJ8.5AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5AHM3/H Tags
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