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Vishay General Semiconductor - Diodes Division SMB8J8.5CAHM3_A/H
- Part No.:
- SMB8J8.5CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J8.5CAHM3_A/H.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,878
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Product details
Overview
SMB8J8.5CAHM3_A/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_A/H datasheet, SMB8J8.5CAHM3_A/H pinout, SMB8J8.5CAHM3_A/H application, or SMB8J8.5CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and thermal resistance (RθJA = 72 °C/W) for board-level reliability under repetitive transients.
Technical Context
This device operates as a voltage-clamped shunt protector: during overvoltage events exceeding VWM (8.5 V), it avalanches into low-impedance conduction to clamp line voltage to ≤14.4 V while diverting up to 40 A (10/1000 µs). Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM).
Designed for surface-mount automated assembly, SMB8J8.5CAHM3_A/H meets MSL Level 1 (260 °C reflow peak) and supports operation from –55 °C to +150 °C junction temperature. The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101 qualified construction - critical for automotive ECUs and ADAS sensor modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping initiates; defines safe signal swing margin in protected circuits. |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - tight breakdown tolerance ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 14.4 V at 40 A (10/1000 µs) - clamping voltage directly limits stress on downstream ICs such as CAN transceivers or ADC front-ends. |
| PPPM | 800 W - peak surge power handling capacity determines survivability against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3/4 surges. |
| ID @ VWM | <1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on sensor nodes and low-power MCU interfaces. |
| TJ max. | +150 °C - enables deployment in under-hood automotive environments and industrial motor control enclosures without derating. |
| RθJA | 72 °C/W - thermal resistance informs PCB copper pad design (0.2" × 0.2" recommended) to maintain junction temperature within limit during repeated surges. |
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 bidirectional surge conduction paths; no cathode band - mounting orientation has no electrical effect. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, body electronics, and infotainment systems. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and eliminates corrosive halogen emissions during soldering or end-of-life incineration. |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR ≈ 4.0 V) versus competing TVS devices, reducing voltage overshoot on fast-rising transients. |
| MSL Level 1 moisture sensitivity | Allows standard SMT reflow without baking - reduces manufacturing cost and avoids moisture-induced popcorning defects. |
| Glass-passivated junction | Provides stable VBR over time and temperature, minimizing parameter drift in long-lifetime industrial applications. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) in engine control modules from load dump and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional shunt clamping element placed between signal line and ground, responding within <1 ns to transients. Use Value: Limits voltage to ≤14.4 V during 40 A surges, preventing latch-up or gate oxide damage in connected microcontrollers and signal conditioners. |
Use Scenario: Safeguarding PLC digital input channels exposed to relay coil back-EMF and field wiring surges in factory automation. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input lines, operating in parallel with optocoupler input stages. Use Value: Withstands repeated 800 W surges without degradation, eliminating need for fuse replacement or channel downtime in harsh industrial settings. |
| Automotive Camera Module Power Line | USB Type-C Port ESD/Surge Protection |
Use Scenario: Protecting 12 V power rail of rear-view or surround-view camera modules from ISO 7637-2 Pulse 5a (load dump). IC Role / Device Role / Timing Role: High-power TVS placed upstream of DC-DC converter input, clamping transients before regulation stage. Use Value: 800 W PPPM rating handles 12 V system load dump events without failure, ensuring camera uptime during vehicle ignition cycles. |
Use Scenario: Secondary surge protection on VBUS line of USB-C receptacles in docking stations and automotive infotainment head units. IC Role / Device Role / Timing Role: Coordinated clamping device working with primary ESD array (e.g., 15 kV HBM) to absorb high-energy surges beyond ESD spec. Use Value: Clamps 10/1000 µs surges to 14.4 V while maintaining <1.0 µA leakage - preserving VBUS regulation accuracy and USB PD negotiation integrity. |
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_A/H | Same electrical specs, but RoHS-compliant without halogen-free certification (E3 vs HM3). | Approved for commercial/industrial use; not certified for halogen-free automotive programs requiring IEC 61249-2-21 compliance. | Select SMB8J8.5CAHE3_A/H when halogen-free requirement is not mandated and cost optimization is prioritized. |
| SMAJ8.5CA | Lower PPPM (400 W), smaller SMA (DO-214AC) package, higher RθJA (~100 °C/W), same VWM/VBR/VC. | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); unsuitable for ISO 7637-2 Pulse 5a or lightning-induced surges. | Choose SMAJ8.5CA only for space-constrained consumer electronics where 800 W surge immunity is not required. |
Compared with SMB8J8.5CAHE3_A/H and SMAJ8.5CA, SMB8J8.5CAHM3_A/H uniquely combines AEC-Q101 qualification, halogen-free construction, and 800 W surge capacity - making it the only option qualified for high-reliability automotive power-line protection without layout or thermal redesign.
Availability
SMB8J8.5CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and USB-C power delivery protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMB8J8.5CAHM3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMB8JxxCA series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, bidirectional surge suppression in automotive and industrial environments where AEC-Q101 compliance and thermal robustness are mandatory.
FAQ
What is the clamping voltage of SMB8J8.5CAHM3_A/H at its rated peak pulse current?
The SMB8J8.5CAHM3_A/H has a maximum clamping voltage (VC) of 14.4 V at 40 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring connected ICs remain within absolute maximum ratings.
Is SMB8J8.5CAHM3_A/H suitable for automotive applications?
Yes, SMB8J8.5CAHM3_A/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction - meeting requirements for engine control units, ADAS sensors, and infotainment systems. Its -55 °C to +150 °C operating range and validated reliability testing confirm suitability for under-hood and cabin automotive deployments.
How does the SMB8J8.5CAHM3_A/H differ from unidirectional variants like SMB10J8.5A?
SMB8J8.5CAHM3_A/H is bidirectional with symmetric clamping behavior on both polarities and no cathode marking, whereas SMB10J8.5A is unidirectional (cathode-banded), offers 1000 W PPPM, and conducts only in reverse bias. The "8" prefix denotes 800 W rating; "10" denotes 1000 W - making SMB10J8.5A unsuitable for AC-coupled or dual-polarity signal lines protected by SMB8J8.5CAHM3_A/H.
What is the thermal resistance of SMB8J8.5CAHM3_A/H, and how does it affect PCB layout?
SMB8J8.5CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperature during repeated surges, PCB layout must provide adequate copper area and thermal vias - undersized pads increase RθJA and risk thermal runaway during high-duty-cycle transients.
Does SMB8J8.5CAHM3_A/H require orientation-specific placement on the PCB?
No, SMB8J8.5CAHM3_A/H is a bidirectional TVS diode with symmetrical terminals and no polarity marking - orientation during placement has no electrical impact. Unlike unidirectional variants (e.g., SMB10J8.5A), it does not feature a cathode band and functions identically regardless of anode/cathode alignment on the board.
SMB8J8.5CAHM3_A/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:
- Obsolete
- 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_A/H FAQ
1.How can I place an order for SMB8J8.5CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J8.5CAHM3_A/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_A/H reliable?
The price and inventory of SMB8J8.5CAHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J8.5CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J8.5CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J8.5CAHM3_A/H?
SMB8J8.5CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J8.5CAHM3_A/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_A/H?
For technical support, including SMB8J8.5CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J8.5CAHM3_A/H requirements.
6.How does Aetrix verify that SMB8J8.5CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J8.5CAHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J8.5CAHM3_A/H?
All SMB8J8.5CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J8.5CAHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMB8J8.5CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J8.5CAHM3_A/H Tags
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