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Vishay General Semiconductor - Diodes Division SMB8J8.5CAHM3/I
- Part No.:
- SMB8J8.5CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J8.5CAHM3/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,243
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Product details
Overview
SMB8J8.5CAHM3/I 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 maximum 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/I datasheet, SMB8J8.5CAHM3/I pinout, SMB8J8.5CAHM3/I application, or SMB8J8.5CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance (HM3 suffix), and compatibility with 0.2" × 0.2" copper pad layout per JEDEC DO-214AA thermal requirements.
Technical Context
This device operates as a voltage-clamped shunt protector, responding within <1 ps to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1 µA at VWM), while the bidirectional configuration enables symmetric suppression across AC-coupled or floating lines without polarity constraints.
The SMB8J8.5CAHM3/I is rated for TJ = –55 °C to +150 °C operation and meets MSL Level 1 per J-STD-020 (260 °C peak reflow). Its RθJA of 72 °C/W and RθJL of 20 °C/W support reliable thermal dissipation under repetitive surge conditions when mounted on minimum recommended pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing margin for protected line. |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - Tight breakdown window ensures predictable turn-on and avoids false triggering near system supply rails. |
| VC @ IPPM | 14.4 V at 40 A (10/1000 µs) - Clamping voltage limits downstream IC stress during 800 W surge events; critical for 12 V automotive bus protection. |
| PPPM | 800 W - Peak pulse power rating determines survivability against ISO 7637-2 Pulse 1/2a/5a surges and IEC 61000-4-5 Line-to-Line surges. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage preserves signal integrity and battery life in always-on sensor nodes. |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments and high-ambient industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, temperature cycling, and ESD HBM ≥8 kV. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals serve identically as clamping nodes; bidirectional conduction allows placement on AC or floating differential lines without orientation check. |
| Case (cathode band absent) | Thermal and mechanical interface | No cathode band marking confirms bidirectional construction; case connects directly to PCB copper for thermal relief and mechanical anchoring. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test standards - supports use in ADAS camera modules and body control units without additional qualification. |
| Halogen-free & RoHS-compliant (HM3) | Meets IPC-1752A material declaration requirements and EU Directive 2011/65/EU - enables compliance in global Tier-1 automotive BOMs. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 10605 ESD), improving clamping precision for sensitive analog front-ends. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without baking or special handling - reduces SMT line complexity and cost. |
| Glass passivated junction | Ensures long-term VBR stability over temperature and lifetime; prevents parameter drift in harsh thermal cycling environments. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) in engine control modules from load dump and inductive kickback. IC Role / Device Role: Bidirectional shunt clamp absorbing energy from ±100 V transients while maintaining signal fidelity below 8.5 V. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V microcontrollers interfacing with 12 V vehicle power domains. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V DC field wiring exposed to relay coil flyback and lightning-induced surges. IC Role / Device Role: Fast-response TVS limiting transient voltage to ≤14.4 V during 40 A 10/1000 µs events on DIN-rail mounted I/O cards. Use Value: Eliminates need for external series impedance or RC filtering, preserving signal edge rate for high-speed discrete inputs. |
| USB Type-C Port Protection | RS-485 Transceiver Interface |
Use Scenario: Shielding USB-C CC and VCONN lines from ESD (±15 kV contact) and hot-swap voltage spikes in portable docking stations. IC Role / Device Role: Low-capacitance bidirectional clamp placed directly at connector to minimize trace inductance impact on clamping speed. Use Value: Maintains USB-C signal integrity up to 10 Gbps while meeting IEC 61000-4-2 Level 4 without degrading eye diagram. |
Use Scenario: Protecting half-duplex RS-485 transceivers (e.g., SN65HVD230) on factory floor communication buses from ground loop surges and cable discharge events. IC Role / Device Role: Common-mode TVS on A/B differential pair, clamping both lines simultaneously to limit differential overshoot. Use Value: Enables robust multi-drop network operation in electrically noisy environments without repeater insertion or isolation. |
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/I | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3); no AEC-Q101 qualification. | Suitable for commercial/industrial use only; not approved for automotive production. | Select when halogen-free content and automotive qualification are not required - lower cost, same footprint. |
| SMAJ8.5CAHM3 | Lower PPPM (400 W vs 800 W); SMA package (smaller, higher RθJA = 110 °C/W); identical VWM/VBR/VC. | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); unsuitable for ISO 7637-2 Pulse 5a. | Choose for space-constrained consumer designs where 800 W surge immunity is unnecessary. |
Compared with SMB8J8.5CAHE3/I, the SMB8J8.5CAHM3/I adds halogen-free composition and AEC-Q101 validation for automotive use; versus SMAJ8.5CAHM3, it delivers double pulse power handling and superior thermal performance via larger SMB package - critical for sustained surge duty cycles.
Availability
SMB8J8.5CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and USB-C port safeguarding requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMB8J8.5CAHM3/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 power efficiency.
The SMB8J8.5CAHM3/I belongs to Vishay's TRANSZORB® family of high-power TVS diodes, engineered specifically for robust transient suppression in automotive, industrial, and communications infrastructure where AEC-Q101 compliance and high surge resilience are mandatory.
FAQ
What is the clamping voltage of SMB8J8.5CAHM3/I at its rated peak pulse current?
The SMB8J8.5CAHM3/I exhibits a maximum clamping voltage (VC) of 14.4 V when subjected to its rated 40 A peak pulse current (IPPM) 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 - essential for ensuring downstream ICs remain within absolute maximum ratings.
Is SMB8J8.5CAHM3/I suitable for automotive applications?
Yes, SMB8J8.5CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction. It is explicitly validated for automotive use cases including engine control units, body electronics, and ADAS sensor interfaces - meeting requirements for temperature cycling, HTOL, and ESD robustness per the AEC-Q101 standard.
How does the SMB8J8.5CAHM3/I differ from unidirectional variants like SMB10J8.5A?
The SMB8J8.5CAHM3/I is bidirectional with symmetrical clamping behavior and no polarity marking, whereas SMB10J8.5A is unidirectional with a cathode band and forward conduction capability. The SMB8J8.5CAHM3/I offers 800 W PPPM and 40 A IPPM, while SMB10J8.5A provides 1000 W PPPM and 69.4 A IPPM - making the latter better suited for higher-energy single-polarity surges.
What is the thermal resistance specification for SMB8J8.5CAHM3/I?
The SMB8J8.5CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W, measured on 0.2" × 0.2" copper pads per JEDEC DO-214AA guidelines. These values enable effective heat dissipation during repetitive surge events and support reliable operation up to +150 °C junction temperature.
Does SMB8J8.5CAHM3/I require orientation during PCB placement?
No, SMB8J8.5CAHM3/I does not require orientation during placement because it is a bidirectional TVS diode with no cathode marking. Both terminals are functionally identical, allowing flexible routing on differential or AC-coupled lines without polarity verification - reducing assembly errors and enabling automated optical inspection simplification.
SMB8J8.5CAHM3/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:
- -
- 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/I FAQ
1.How can I place an order for SMB8J8.5CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J8.5CAHM3/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 SMB8J8.5CAHM3/I reliable?
The price and inventory of SMB8J8.5CAHM3/I 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/I is usually 5 days.
3.What payment methods are accepted for SMB8J8.5CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J8.5CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J8.5CAHM3/I?
SMB8J8.5CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J8.5CAHM3/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 SMB8J8.5CAHM3/I?
For technical support, including SMB8J8.5CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J8.5CAHM3/I requirements.
6.How does Aetrix verify that SMB8J8.5CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMB8J8.5CAHM3/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 SMB8J8.5CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMB8J8.5CAHM3/I?
All SMB8J8.5CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J8.5CAHM3/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 SMB8J8.5CAHM3/I part is unused and in its original packaging.
Return procedure for SMB8J8.5CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J8.5CAHM3/I Tags
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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