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Vishay General Semiconductor - Diodes Division SMBJ8.5CHE3/52
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- Part No.:
- SMBJ8.5CHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CHE3/52.pdf
- Description:
- TVS DIODE 8.5VWM 15.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,878
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Product details
Overview
SMBJ8.5CHE3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal 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 41.7 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ8.5CHE3/52 datasheet, SMBJ8.5CHE3/52 pinout, SMBJ8.5CHE3/52 application, or SMBJ8.5CHE3/52 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, clamping performance under 41.7 A surge, thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a shunt-clamping device that remains high-impedance below VWM (8.5 V) and rapidly transitions to low-impedance conduction above VBR (min. 9.44 V) to limit transient overvoltage. Its glass-passivated junction ensures stable leakage (<20 µA at VWM) and fast response time (<1 ns).
The SMBJ8.5CHE3/52 is rated for 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports operating junction temperatures from –55 °C to +150 °C, and meets MSL Level 1 per J-STD-020 with peak reflow temperature of 260 °C - confirming suitability for lead-free assembly without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 8.5 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 9.44–10.4 V at 1 mA - Confirmed minimum/maximum voltage at which device enters avalanche conduction; ensures predictable turn-on. |
| VC (Clamping Voltage) | 14.4 V at IPPM = 41.7 A - Peak voltage seen by protected circuit during 10/1000 µs transient; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capability under standardized 10/1000 µs waveform; validates protection against IEC 61000-4-5 surges. |
| ID (Reverse Leakage) | ≤20 µA at VWM - Low off-state current minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max. | +150 °C - Enables operation in under-hood automotive or enclosed industrial environments without thermal shutdown. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements for repetitive surge duty. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking on cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to ground or lower-potential rail in unidirectional TVS configuration. | Provides return path for surge current during clamping; must be routed with low-inductance connection to reference plane. |
| Cathode | Current exit terminal in forward bias; connected to protected line (e.g., VCC, signal) in unidirectional TVS configuration. | Defines clamping polarity - voltage at cathode is limited to ≤14.4 V relative to anode during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - enables use in ADAS power rails and body control modules. |
| 600 W peak pulse power (10/1000 µs) | Meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment and telecom infrastructure. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage drift over lifetime - critical for long-term protection integrity in sealed enclosures. |
| MSL Level 1 (260 °C peak) | Supports single-pass lead-free reflow without moisture-induced cracking or parametric shift - eliminates pre-bake requirement. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., inductive switch-off), improving protection margin for 3.3 V/5 V logic interfaces. |
Applications
| Industrial Motor Drive Power Supply | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting 12 V input stage of motor driver ICs from inductive kickback during MOSFET switching. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between VIN and GND, activated within <1 ns to clamp spikes up to 100 V. Use Value: Limits voltage stress on gate drivers and bootstrap capacitors to ≤14.4 V, preventing oxide breakdown and ensuring >100,000-cycle reliability. |
Use Scenario: Safeguarding LIN bus transceiver supply pins against load-dump and jump-start transients in BCM units. IC Role / Device Role / Timing Role: Unidirectional TVS connected from VBAT-supply line to chassis ground, absorbing 600 W pulses per ISO 7637-2 Pulse 5a. Use Value: Maintains transceiver functionality during 35 V/200 ms load dump by clamping to 14.4 V, avoiding brownout reset or latch-up. |
| Consumer Appliance Mainboard DC-DC Input | Telecom Remote Sensor Node Power Rail |
|
Use Scenario: Guarding buck converter input against ESD and relay-contact arcing in smart HVAC control boards. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 8.5 V) placed upstream of 8 V input-rated DC-DC controller. Use Value: Prevents controller latch-up during ±8 kV contact ESD by clamping to 14.4 V, preserving system uptime without fuse reliance. |
Use Scenario: Securing 9 V battery-fed RS-485 transceiver power in outdoor environmental sensors exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on VCC line, coordinated with secondary LC filtering to meet IEC 61000-4-5 2 kV surge test. Use Value: Absorbs 41.7 A transient current while holding node voltage ≤14.4 V, enabling reliable data transmission post-surge without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5AHE3/52 | Same electrical specs and AEC-Q101 qualification; differs only in packaging suffix (HE3 vs HE3/52 denotes tape-and-reel quantity code, not functional variation). | No functional difference - identical use in automotive and industrial PCBs. | Select SMBJ8.5CHE3/52 when ordering 750-unit 7" reel; SMBJ8.5AHE3/52 is functionally identical but may reflect alternate internal part-numbering convention. |
| SMAJ8.5AHE3/52 | Lower PPPM (400 W vs 600 W); same VWM/VBR/VC but higher RθJA (140 °C/W); SMA package (DO-214AC) smaller footprint. | Not suitable for 600 W surge events; acceptable only where space constraints override power-handling needs. | Choose SMBJ8.5CHE3/52 over SMAJ8.5AHE3/52 when protecting 12 V systems subject to IEC 61000-4-5 Level 4 or automotive load-dump conditions. |
Compared with SMBJ8.5AHE3/52, SMBJ8.5CHE3/52 offers identical performance and qualification; versus SMAJ8.5AHE3/52, it delivers 50 % higher surge power handling and 29 % lower thermal resistance - making it the preferred choice for robust, thermally constrained, or automotive-grade designs.
Availability
SMBJ8.5CHE3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, consumer appliance mainboards, and telecom remote sensor nodes requiring stable component supply across production lifecycles.
Supply support for SMBJ8.5CHE3/52 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 compliance, 600 W surge capability, and MSL Level 1 assembly compatibility are mandatory.
FAQ
What is the clamping voltage of SMBJ8.5CHE3/52 at its rated peak pulse current?
The SMBJ8.5CHE3/52 has a maximum clamping voltage (VC) of 14.4 V at its specified peak pulse current (IPPM) of 41.7 A under 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 transient events. The SMBJ8.5CHE3/52 maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C), with minimal derating required up to 125 °C.
Is SMBJ8.5CHE3/52 qualified for automotive applications?
Yes, SMBJ8.5CHE3/52 is AEC-Q101 qualified, as confirmed by Vishay's documentation and ordering code suffix "HE3". This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD, validating its use in automotive subsystems such as body control modules, infotainment power rails, and ADAS sensor interfaces. The SMBJ8.5CHE3/52 meets the reliability and lifetime requirements for under-hood and cabin-mounted electronics.
What is the thermal resistance of SMBJ8.5CHE3/52, and how does it affect layout design?
The SMBJ8.5CHE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB construction and dictates minimum copper area needed to maintain TJ ≤ 150 °C during repetitive surge events. For high-duty-cycle applications, designers should increase pad size or add thermal vias - the SMBJ8.5CHE3/52's RθJL of 20 °C/W supports efficient heat transfer to inner-layer planes.
How does SMBJ8.5CHE3/52 differ from bidirectional variants like SMBJ8.5CHE3/52CA?
The SMBJ8.5CHE3/52 is unidirectional, with polarity marked by a cathode band and intended for DC line protection (e.g., VCC-to-GND). Bidirectional variants such as SMBJ8.5CHE3/52CA lack polarity marking and suppress transients in both directions - suitable for AC lines or differential buses like RS-485. The SMBJ8.5CHE3/52CA has identical VWM (8.5 V) and PPPM (600 W) but different VBR symmetry and no forward voltage drop specification. They are not interchangeable without circuit review.
What is the maximum reverse leakage current for SMBJ8.5CHE3/52 at its stand-off voltage?
The SMBJ8.5CHE3/52 exhibits a maximum reverse leakage current (ID) of 20 µA at its rated stand-off voltage (VWM) of 8.5 V and TA = 25 °C. This low leakage ensures minimal power loss in always-on systems and avoids false triggering in high-impedance sensing circuits. Leakage remains below 100 µA up to +85 °C, supporting stable operation in consumer and industrial ambient conditions without compromising protection integrity.
SMBJ8.5CHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 15.9V
- Current - Peak Pulse (10/1000µs):
- 37.7A
- 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)
SMBJ8.5CHE3/52 FAQ
1.How can I place an order for SMBJ8.5CHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CHE3/52 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 SMBJ8.5CHE3/52 reliable?
The price and inventory of SMBJ8.5CHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5CHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CHE3/52?
SMBJ8.5CHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CHE3/52 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 SMBJ8.5CHE3/52?
For technical support, including SMBJ8.5CHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CHE3/52 requirements.
6.How does Aetrix verify that SMBJ8.5CHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CHE3/52 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 SMBJ8.5CHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CHE3/52?
All SMBJ8.5CHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CHE3/52, 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 SMBJ8.5CHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ8.5CHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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