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Vishay General Semiconductor - Diodes Division SMBJ8.5CAHE3/52
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- Part No.:
- SMBJ8.5CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CAHE3/52.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,068
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Product details
Overview
SMBJ8.5CAHE3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. 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 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 industrial sensor interfaces.
For engineers reviewing the SMBJ8.5CAHE3/52 datasheet, SMBJ8.5CAHE3/52 pinout, SMBJ8.5CAHE3/52 application, or SMBJ8.5CAHE3/52 equivalent, this device serves as a RoHS-compliant, AEC-Q101-qualified transient protector for bidirectional AC-coupled lines, DC power inputs, and low-voltage data interfaces requiring fast response (<1 ns), low clamping ratio, and stable performance across -55 °C to +150 °C junction temperature range.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction delivers sub-nanosecond response time and low incremental surge resistance, enabling effective suppression of ESD, lightning-induced surges, and inductive switching transients without degradation under repetitive 0.01% duty cycle stress.
The device is rated for 600 W peak pulse power per 10/1000 µs waveform, derated linearly above 25 °C ambient per Fig. 2, and exhibits a typical thermal resistance of 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its 1.0 µA max reverse leakage at VWM ensures minimal standby power loss in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before significant conduction begins; sets safe margin below system nominal voltage. |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - Confirmed breakdown threshold defining turn-on consistency and tolerance band for design margining. |
| VC @ IPPM | 14.4 V at 41.7 A - Clamped voltage during 600 W transient event; determines maximum stress imposed on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability with 10/1000 µs waveform; defines transient energy absorption capacity. |
| IPPM | 41.7 A - Peak pulse current corresponding to VC; used to size PCB trace width and verify layout survivability. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in high-temperature industrial and automotive under-hood environments. |
| Package | SMB (DO-214AA) - 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, MSL Level 1 (260 °C peak reflow), UL 94 V-0 rated compound. Bidirectional construction has no polarity marking; terminals are symmetrical anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Provides low-impedance path to ground or reference rail during either polarity surge; connects to protected line. |
| Cathode | Transient return path (bidirectional) | Functionally identical to Anode in bidirectional configuration; enables clamping in both voltage polarities without external bias. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, audio) without polarity concerns. |
| 600 W peak pulse power | Withstands high-energy transients such as IEC 61000-4-5 Level 4 (4 kV surge) when properly mounted on recommended copper pads. |
| AEC-Q101 qualified | Validated for automotive applications including body control modules and infotainment power supplies where reliability under thermal cycling is critical. |
| Low clamping ratio (VC/VBR ≈ 1.43) | Minimizes overvoltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs and ICs. |
| 1.0 µA max reverse leakage @ VWM | Ensures negligible standby current draw in always-on IoT sensors and battery-backed systems, preserving operational lifetime. |
Applications
| Industrial Sensor Interface | Automotive Power Input Protection |
|---|---|
|
Use Scenario: Protecting analog output lines (4–20 mA) and digital I/O of pressure/temperature sensors exposed to motor drive noise and relay switching spikes. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and ground, clamping transients before they reach ADC input or microcontroller GPIO. Use Value: Prevents sensor calibration drift and false readings caused by >100 V transients, maintaining measurement integrity in factory automation PLCs. |
Use Scenario: Safeguarding 12 V power input of telematics control units (TCUs) against load dump (ISO 7637-2 Pulse 5a) and jump-start surges. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on main power rail, coordinated with upstream fuse and downstream LDO. Use Value: Limits voltage excursion to ≤14.4 V during 600 W events, preventing brownout resets and permanent damage to PMIC and SoC. |
| RS-485 Communication Line | Consumer Appliance Motor Control |
|
Use Scenario: Shielding differential bus lines in smart metering and building automation networks from ESD (IEC 61000-4-2 ±8 kV) and fast transients. IC Role / Device Role / Timing Role: Placed across A/B lines and referenced to ground, providing symmetrical clamping without disrupting common-mode range. Use Value: Maintains signal integrity up to 10 Mbps while surviving repeated ±15 kV contact discharge, reducing field failure rates in outdoor deployments. |
Use Scenario: Protecting gate drivers and MCU I/O in washing machine motor inverters subjected to back-EMF spikes from brushed DC motors. IC Role / Device Role / Timing Role: Mounted directly at motor connector interface to absorb inductive kickback before it propagates into control board traces. Use Value: Eliminates need for additional RC snubbers; reduces component count and PCB area while meeting IEC 61000-4-4 Level 3 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CA-E3/52 | Commercial-grade variant without AEC-Q101 qualification; same VWM, VBR, VC, and package. | Approved for industrial and consumer use only; not certified for automotive production. | Select when AEC-Q101 compliance is unnecessary and cost sensitivity is higher. |
| SMAJ8.5CAHE3/A | Same electrical specs but in smaller SMA (DO-214AC) package; 20% smaller footprint and lower thermal mass. | Limited to ≤400 W peak pulse power due to reduced thermal dissipation; unsuitable for sustained surge testing. | Choose for space-constrained designs where transient energy is limited to <500 W and board real estate is critical. |
Compared with SMBJ8.5CAHE3/52, the E3/52 variant offers identical protection performance at lower qualification level, while the SMAJ8.5CAHE3/A trades thermal robustness for compactness - making SMBJ8.5CAHE3/52 optimal for automotive and high-reliability industrial applications demanding full 600 W capability and AEC-Q101 validation.
Availability
SMBJ8.5CAHE3/52 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive power input protection, RS-485 communication lines, and consumer appliance motor control requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ8.5CAHE3/52 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was developed to deliver high-power transient suppression in compact surface-mount packages for automotive, industrial, and communications equipment where robustness and AEC-Q101 compliance are mandatory.
FAQ
What does the "CA" suffix indicate in SMBJ8.5CAHE3/52?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ8.5CAHE3/52 provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMBJ8.5A), it has no cathode marking and functions identically in either polarity, making it ideal for AC signal lines, differential buses, and floating power domains where polarity reversal may occur.
Is SMBJ8.5CAHE3/52 suitable for IEC 61000-4-5 surge testing?
Yes, SMBJ8.5CAHE3/52 is rated for 600 W peak pulse power with a 10/1000 µs waveform, which aligns with IEC 61000-4-5 Level 4 (4 kV open-circuit voltage, 2 Ω source impedance). When mounted per Vishay's recommended 0.2" × 0.2" copper pad layout, it reliably clamps to 14.4 V during such events - protecting downstream circuitry without failure across multiple surge cycles.
How does the HE3 suffix affect SMBJ8.5CAHE3/52's qualification status?
The "HE3" suffix indicates that SMBJ8.5CAHE3/52 is RoHS-compliant and AEC-Q101 qualified - verified for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock. This distinguishes it from commercial-grade variants like SMBJ8.5CA-E3/52 and confirms suitability for under-hood and safety-critical vehicle subsystems.
What is the maximum allowable PCB trace length between SMBJ8.5CAHE3/52 and the protected IC?
To maintain effective clamping, PCB trace inductance must be minimized: total loop inductance from SMBJ8.5CAHE3/52 to ground plane should remain below 10 nH. This typically requires trace lengths under 5 mm with direct vias to inner ground planes - longer paths increase VPEAK during fast transients due to L·di/dt, potentially exceeding the protected IC's absolute maximum ratings despite SMBJ8.5CAHE3/52's 14.4 V clamping voltage.
Can SMBJ8.5CAHE3/52 replace SMBJ8.0CAHE3/52 in an existing design?
Yes, SMBJ8.5CAHE3/52 can generally replace SMBJ8.0CAHE3/52 if the system's normal operating voltage allows a 0.5 V higher VWM. Both share identical package, clamping behavior, and AEC-Q101 qualification. However, verify that the increased VBR (9.44–10.4 V vs. 8.89–9.83 V) does not compromise margin against overvoltage alarms or undervoltage lockout thresholds in your power monitoring circuitry.
SMBJ8.5CAHE3/52 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):
- 41.7A
- Power - Peak Pulse:
- 600W
- 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 (SMBJ)
SMBJ8.5CAHE3/52 FAQ
1.How can I place an order for SMBJ8.5CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CAHE3/52 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 SMBJ8.5CAHE3/52 reliable?
The price and inventory of SMBJ8.5CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CAHE3/52?
SMBJ8.5CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CAHE3/52 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 SMBJ8.5CAHE3/52?
For technical support, including SMBJ8.5CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CAHE3/52 requirements.
6.How does Aetrix verify that SMBJ8.5CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CAHE3/52 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 SMBJ8.5CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CAHE3/52?
All SMBJ8.5CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CAHE3/52, 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 SMBJ8.5CAHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ8.5CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5CAHE3/52 Tags
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Diodes Incorporated
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