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Vishay General Semiconductor - Diodes Division SMB8J8.5CAHM3/H
- Part No.:
- SMB8J8.5CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J8.5CAHM3/H.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,190
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Product details
Overview
SMB8J8.5CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power 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 clamping voltage (VC) at 40 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J8.5CAHM3/H datasheet, SMB8J8.5CAHM3/H pinout, SMB8J8.5CAHM3/H application, or SMB8J8.5CAHM3/H equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 72 °C/W), junction-to-lead resistance (RθJL = 20 °C/W), and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust protection against ESD, lightning-induced transients, and inductive switching spikes without polarity sensitivity. Its glass-passivated silicon junction ensures stable VBR tolerance (±5%), low incremental surge resistance, and fast sub-nanosecond response time to clamp voltage excursions before downstream IC damage occurs.
Rated for -55 °C to +150 °C operating junction temperature and qualified to AEC-Q101, SMB8J8.5CAHM3/H supports automotive-grade reliability under thermal cycling and mechanical stress. The device mounts on 0.2" × 0.2" copper pads and meets UL 94 V-0 flammability requirements with matte tin-plated leads solderable per J-STD-002 and JESD22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse working voltage before leakage exceeds 1.0 μA; defines safe operating margin below clamping threshold |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - tight breakdown window ensures predictable turn-on during transients |
| VC @ IPPM | 14.4 V at 40 A (10/1000 μs) - clamping voltage limits stress on protected circuitry during worst-case surge |
| PPPM | 800 W - peak pulse power handling capability determines survivability against IEC 61000-4-5 Level 4 surges |
| RθJA / RθJL | 72 °C/W / 20 °C/W - thermal resistances define derating behavior above 25 °C ambient and PCB heat dissipation path efficiency |
| TJ max | +150 °C - maximum junction temperature enables operation in under-hood automotive environments |
| AEC-Q101 | Qualified - validated for automotive applications including engine control units, ADAS sensors, and body electronics |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical terminals require no orientation during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts bidirectionally when voltage exceeds ±VBR - eliminates layout polarity constraints |
| Cathode Band (absent) | Polarity indicator | Not present on bidirectional variants; device has no designated anode/cathode - simplifies automated assembly and reduces orientation errors |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock per test plan - supports Tier-1 supply chain compliance |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets IEC 61249-2-21 and JEDEC J-STD-203 material requirements - enables green manufacturing and export compliance |
| MSL Level 1 (260 °C peak reflow) | Unlimited floor life at ≤30 °C/60% RH - supports standard SMT reflow without baking or dry pack handling |
| Glass-passivated junction | Enhances long-term stability of VBR and leakage performance under thermal stress and humidity exposure |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients - critical for protecting high-speed communication lines (e.g., CAN FD, LIN) |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog and digital outputs of wheel speed, pressure, and temperature sensors exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector interface to shunt surge energy before reaching ASIC or microcontroller input pins. Use Value: Maintains signal integrity under 100 V/10 ms load dump events while holding clamped voltage ≤14.4 V - prevents latch-up or gate oxide damage in downstream CMOS inputs. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers subjected to inductive kickback from solenoid valves and contactors. IC Role / Device Role / Timing Role: Primary overvoltage clamp on field-side input traces, coordinated with series impedance and filtering to meet IEC 61000-4-4 EFT immunity. Use Value: Absorbs 800 W surge energy without degradation, enabling >100,000 surge cycles per IEC 61000-4-5 Ed.3 - extends module service life in factory automation environments. |
| Automotive Body Control Module | Telecom Power Interface |
|
Use Scenario: Securing LIN bus transceivers and LED driver control lines in door modules and lighting ECUs against battery reversal and jump-start transients. IC Role / Device Role / Timing Role: Fast-response TVS placed adjacent to transceiver pins to clamp ±30 V transients within 1 ns - preserves data integrity during vehicle start-stop events. Use Value: Bidirectional symmetry eliminates need for dual unidirectional devices; 14.4 V VC ensures LIN physical layer remains within 12 V ±10% specification during surge. |
Use Scenario: Protecting 48 V DC power feeds and RS-485 data lines in remote radio head (RRH) base stations exposed to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Secondary-level surge suppression stage after gas discharge tube (GDT), limiting let-through voltage to telecom PHY ICs. Use Value: 800 W PPPM rating allows coordination with upstream GDT to achieve full IEC 61643-21 Class II protection - reduces system-level BOM count and board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J8.5CAHE3/H | Same electrical specs and package; RoHS-compliant but not halogen-free; uses standard tin plating instead of matte tin per JESD201 Class 2 | Approved for commercial and industrial use; lacks AEC-Q101 validation and halogen-free certification required for automotive OEM programs | Select when cost-sensitive industrial designs do not require automotive qualification or halogen-free materials |
| SMAJ8.5CA | Lower PPPM (400 W), higher RθJA (110 °C/W), SMA package (smaller footprint, lower thermal mass); same VWM/VBR/VC ratings | Suitable for space-constrained consumer electronics; insufficient for sustained surge duty cycles or automotive under-hood thermal environments | Choose only for low-energy, non-automotive applications where PCB area is critical and peak surge energy ≤400 W |
Compared with SMB8J8.5CAHE3/H, SMB8J8.5CAHM3/H adds halogen-free compliance and AEC-Q101 qualification - essential for automotive production. Against SMAJ8.5CA, it delivers double pulse power, superior thermal management, and automotive-grade reliability - making it the sole choice for demanding industrial and vehicle platforms.
Availability
SMB8J8.5CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, body control units, and telecom power interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMB8J8.5CAHM3/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 optimization.
SMB8J8.5CAHM3/H belongs to Vishay's TRANSZORB® family of high-power TVS diodes engineered for automotive and industrial surge immunity - targeting systems needing AEC-Q101 validation, high PPPM, and robust thermal performance in compact SMB packages.
FAQ
What is the clamping voltage of SMB8J8.5CAHM3/H at its rated peak pulse current?
The SMB8J8.5CAHM3/H clamps to a maximum of 14.4 V when subjected to its specified peak pulse current of 40 A with a 10/1000 μs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and ensures downstream components remain within safe operating voltage limits during surge events. The clamping performance is guaranteed across the full operating temperature range of -55 °C to +150 °C.
Is SMB8J8.5CAHM3/H suitable for automotive applications?
Yes, SMB8J8.5CAHM3/H is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials - meeting stringent automotive reliability requirements for under-hood and chassis-mounted electronics. Its thermal resistance (RθJA = 72 °C/W), junction temperature rating (+150 °C), and MSL Level 1 reflow compatibility make SMB8J8.5CAHM3/H appropriate for engine control units, ADAS sensor interfaces, and body electronics modules.
How does the HM3 suffix differ from HE3 in SMB8J8.5CAHM3/H?
The HM3 suffix in SMB8J8.5CAHM3/H denotes halogen-free, RoHS-compliant construction with matte tin-plated leads qualified to JESD201 Class 2 whisker resistance, whereas HE3 indicates RoHS compliance without halogen-free certification. Both carry AEC-Q101 qualification, but HM3 satisfies additional environmental mandates for Tier-1 automotive suppliers requiring halogen-free bill-of-materials documentation and long-term regulatory compliance.
What is the standoff voltage (VWM) and why is it critical for SMB8J8.5CAHM3/H selection?
The standoff voltage (VWM) of SMB8J8.5CAHM3/H is 8.5 V - the maximum continuous reverse voltage the device can block without exceeding 1.0 μA leakage current. This parameter ensures reliable operation in 8 V nominal systems (e.g., LIN bus, 12 V automotive rails with ripple) by providing sufficient margin below the 9.44–10.4 V breakdown threshold. Selecting a VWM too close to system operating voltage risks premature conduction and increased power loss.
Does SMB8J8.5CAHM3/H have polarity markings, and how is it mounted?
No, SMB8J8.5CAHM3/H is a bidirectional TVS and carries no cathode band or polarity marking - both terminals are functionally identical. It is mounted in SMB (DO-214AA) package using standard SMT reflow with matte tin-plated leads compliant with J-STD-002 and JESD22-B102. Recommended pad layout is 0.2" × 0.2" (5.0 mm × 5.0 mm) copper per terminal to ensure thermal performance and mechanical reliability.
SMB8J8.5CAHM3/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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 55.6A
- Power - Peak Pulse:
- 800W
- 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)
SMB8J8.5CAHM3/H FAQ
1.How can I place an order for SMB8J8.5CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J8.5CAHM3/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 SMB8J8.5CAHM3/H reliable?
The price and inventory of SMB8J8.5CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J8.5CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMB8J8.5CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J8.5CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J8.5CAHM3/H?
SMB8J8.5CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J8.5CAHM3/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 SMB8J8.5CAHM3/H?
For technical support, including SMB8J8.5CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J8.5CAHM3/H requirements.
6.How does Aetrix verify that SMB8J8.5CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMB8J8.5CAHM3/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 SMB8J8.5CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMB8J8.5CAHM3/H?
All SMB8J8.5CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J8.5CAHM3/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 SMB8J8.5CAHM3/H part is unused and in its original packaging.
Return procedure for SMB8J8.5CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J8.5CAHM3/H Tags
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