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Vishay General Semiconductor - Diodes Division SMB8J8.5CAHE3/5B
- Part No.:
- SMB8J8.5CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J8.5CAHE3/5B.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,264
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Product details
Overview
SMB8J8.5CAHE3/5B 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 SMB8J8.5CAHE3/5B datasheet, SMB8J8.5CAHE3/5B pinout, SMB8J8.5CAHE3/5B application, or SMB8J8.5CAHE3/5B equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 72 °C/W), junction temperature range (−55 to +150 °C), and bidirectional clamping behavior critical for ESD and load-dump transient design.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal bias it presents high impedance (<1 µA leakage at 8.5 V), then rapidly avalanches when transients exceed VBR to clamp line voltage at ≤14.4 V. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
Designed per ANSI/IEEE C62.35, it sustains 40 A peak pulse current (10/1000 µs) with 800 W dissipation, derates linearly above 25 °C ambient (Fig. 2), and meets MSL Level 1 reflow profile (260 °C peak). AEC-Q101 qualification confirms suitability for automotive powertrain and body electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - guaranteed avalanche initiation window; ensures consistent turn-on across production lots |
| VC @ IPPM | 14.4 V at 40 A - clamped voltage during 10/1000 µs surge; determines protected IC's maximum stress exposure |
| PPPM | 800 W - peak transient energy absorption capability; enables robust protection against ISO 7637-2 Pulse 1/2/5a in automotive systems |
| TJ max. | +150 °C - maximum junction temperature; supports operation in under-hood environments with minimal derating |
| RθJA | 72 °C/W - thermal resistance junction-to-ambient on standard 5.0 mm × 5.0 mm copper pads; informs PCB thermal layout requirements |
| AEC-Q101 | Qualified - validated for automotive reliability including HTOL, TC, UHAST, and ESD; required for ASIL-B sensor modules |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. No polarity marking - bidirectional device with symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient shunt path | Both terminals function identically; connects across protected line (e.g., CAN_H–CAN_L or RS-485 A–B) to clamp differential surges |
| Cathode Band (absent) | Polarity indicator | Not applicable - bidirectional construction eliminates cathode marking; device installs without orientation concern |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor hubs requiring long-term reliability under thermal cycling and humidity |
| 800 W peak pulse power | Withstands 40 A, 10/1000 µs transients - exceeds ISO 7637-2 Pulse 5a (load dump) requirements for 12 V systems |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on downstream ICs; enables use with 12 V tolerant transceivers without additional series impedance |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies SMT assembly in high-volume automotive manufacturing |
| Glass-passivated junction | Ensures stable VBR over time and temperature; prevents parameter drift in harsh environments like industrial motor drives |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs from battery load dump and ESD events in door module ECUs. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed directly at connector entry point to limit transient voltage before signal conditioning stage. Use Value: Clamps to 14.4 V during 40 A surge, keeping transceiver input within absolute maximum rating while maintaining signal integrity during normal 8.5 V operation. |
Use Scenario: Safeguarding RS-485 transceivers in factory automation PLCs exposed to inductive switching noise on long cable runs. IC Role / Device Role / Timing Role: Differential-line TVS across A/B bus lines to suppress common-mode surges without distorting data timing. Use Value: 800 W PPPM handles repetitive 1 kV/100 Ω surge tests per IEC 61000-4-5; low capacitance avoids signal edge degradation at 250 kbps. |
| Consumer Power Adapter Input | Medical Patient Monitor Signal Line |
Use Scenario: Secondary-side DC input protection in USB-C PD adapters subjected to hot-plug transients and lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on 9–12 V rail to absorb fast-rising spikes before DC-DC controller ICs. Use Value: 8.5 V VWM allows clean regulation up to 12 V; 14.4 V VC prevents latch-up in synchronous rectifier MOSFETs during surge events. |
Use Scenario: ESD protection on analog front-end inputs of portable ECG monitors connected to patient electrodes. IC Role / Device Role / Timing Role: Low-leakage bidirectional clamp on biopotential amplifier inputs to prevent damage without degrading microvolt-level signal fidelity. Use Value: <1 µA leakage at 8.5 V preserves amplifier input bias stability; AEC-Q101 qualification ensures long-term parametric consistency in field-deployed devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J8.5CAHM3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification | Required where halogen-free material compliance is mandated (e.g., EU medical equipment directives) | Select when environmental compliance overrides cost sensitivity; same footprint and performance |
| SMAJ8.5CAHE3/A | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VBR/VC ratings | Suitable for space-constrained consumer electronics but insufficient for automotive load-dump duty cycles | Choose only for non-automotive, lower-energy applications where board area is critical and 400 W surge margin is adequate |
Compared with SMB8J8.5CAHE3/5B, the HM3 variant offers identical protection performance with halogen-free materials, while the SMAJ8.5CAHE3/A reduces surge capacity by 50 % and shrinks package size - making it unsuitable for AEC-Q101-requiring systems despite matching voltage parameters.
Availability
SMB8J8.5CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor protection, industrial communication bus hardening, and medical device ESD safeguarding requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMB8J8.5CAHE3/5B 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMB8Jx.xCA family delivers high-power-density TVS protection optimized for AEC-Q101-compliant automotive subsystems and ruggedized industrial interfaces requiring repeatable clamping and long-term parametric stability.
FAQ
What is the peak pulse power rating of SMB8J8.5CAHE3/5B and how is it defined?
The SMB8J8.5CAHE3/5B has a peak pulse power rating (PPPM) of 800 W, measured using the standardized 10/1000 µs double-exponential current waveform per ANSI/IEEE C62.35. This rating reflects its ability to absorb transient energy without failure when mounted on 5.0 mm × 5.0 mm copper pads, and applies specifically to bidirectional operation - distinct from the 1000 W rating of unidirectional variants like SMB10J8.5A.
Is SMB8J8.5CAHE3/5B suitable for automotive applications, and what qualification does it hold?
Yes, SMB8J8.5CAHE3/5B is AEC-Q101 qualified, confirming its reliability for automotive use cases including engine control, body electronics, and ADAS sensor modules. The HE3 suffix explicitly denotes RoHS-compliant and AEC-Q101-qualified construction, validated across temperature cycling, humidity testing, and ESD robustness - making SMB8J8.5CAHE3/5B appropriate for ASIL-B system designs.
How does the clamping voltage of SMB8J8.5CAHE3/5B compare to its breakdown voltage, and why does that matter?
The SMB8J8.5CAHE3/5B clamps at 14.4 V (VC) when subjected to its rated 40 A peak pulse current, while its breakdown voltage (VBR) ranges from 9.44 V to 10.4 V at 1 mA. This clamping ratio (~1.45× VBR) ensures rapid voltage limiting with minimal overshoot - critical for protecting 12 V-tolerant transceivers and preventing latch-up in downstream ICs during surge events.
What is the thermal resistance of SMB8J8.5CAHE3/5B, and how does it affect PCB layout?
SMB8J8.5CAHE3/5B 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. This value directly informs minimum pad area and copper pour requirements: reducing pad size increases RθJA, risking thermal runaway during repeated surges - so PCB layouts must adhere to Vishay's recommended mounting footprint to maintain rated PPPM.
Does SMB8J8.5CAHE3/5B have polarity markings, and how is it installed on the PCB?
No, SMB8J8.5CAHE3/5B has no polarity markings because it is a bidirectional TVS diode - both terminals are functionally identical. Installation requires no orientation check; the device is placed symmetrically across the protected line pair (e.g., between CAN_H and CAN_L or RS-485 A and B), enabling simplified automated placement and eliminating risk of reverse installation errors.
SMB8J8.5CAHE3/5B 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J8.5CAHE3/5B FAQ
1.How can I place an order for SMB8J8.5CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J8.5CAHE3/5B 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 SMB8J8.5CAHE3/5B reliable?
The price and inventory of SMB8J8.5CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J8.5CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J8.5CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J8.5CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J8.5CAHE3/5B?
SMB8J8.5CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J8.5CAHE3/5B 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 SMB8J8.5CAHE3/5B?
For technical support, including SMB8J8.5CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J8.5CAHE3/5B requirements.
6.How does Aetrix verify that SMB8J8.5CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J8.5CAHE3/5B 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 SMB8J8.5CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J8.5CAHE3/5B?
All SMB8J8.5CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J8.5CAHE3/5B, 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 SMB8J8.5CAHE3/5B part is unused and in its original packaging.
Return procedure for SMB8J8.5CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J8.5CAHE3/5B Tags
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