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Vishay General Semiconductor - Diodes Division SMBJ8.5A-E3/52
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- Part No.:
- SMBJ8.5A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5A-E3/52.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,850
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Product details
Overview
SMBJ8.5A-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. 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 41.7 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 μs waveform).
For engineers reviewing the SMBJ8.5A-E3/52 datasheet, SMBJ8.5A-E3/52 pinout, SMBJ8.5A-E3/52 application, or SMBJ8.5A-E3/52 equivalent, key selection considerations include clamping performance under 41.7 A surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity with cathode band marking, RoHS-compliant matte tin plating, and suitability for automotive-grade designs when ordered with HE3 suffix.
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 below 1 ns to clamp transient overvoltages. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) immunity standards when applied with appropriate PCB layout-specifically using 0.2" × 0.2" copper pads per terminal per Vishay's derating guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level signal integrity margin. |
| VBR min/max | 9.44 V / 10.4 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 14.4 V at 41.7 A - Clamped voltage during 10/1000 μs surge; defines maximum stress on downstream ICs like microcontrollers or sensors. |
| PPPM | 600 W - Peak pulse power handling capability; supports robust protection against industrial-grade surges without degradation. |
| ID @ VWM | 1.0 μA max - Ultra-low reverse leakage preserves battery life and signal integrity in low-power sensor interfaces. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; requires minimum 0.2" × 0.2" copper pad per lead for rated power dissipation. |
| Package | SMB (DO-214AA) - Surface-mount outline with 2.20 mm × 3.94 mm footprint; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode identified by a visible band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to circuit ground or lowest potential rail; completes clamping path during positive transients. |
| Cathode | Protected line input | Connected to signal/power line being protected; avalanche conduction occurs from cathode to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables single-device protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) on 24 V industrial buses. |
| Clamping voltage ≤14.4 V at 41.7 A | Ensures protected 3.3 V or 5 V logic circuits remain within absolute maximum ratings during worst-case transients. |
| Glass passivated chip junction | Delivers stable VBR over 1000+ surge cycles and >150 °C junction temperature operation without parameter drift. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| RoHS-compliant, halogen-free option available | Meets IPC-1752A material declaration requirements for automotive and medical OEM supply chains. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input channels in programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Shunt TVS placed between channel and ground to clamp transients before they reach input conditioning op-amps or isolation barriers. Use Value: Limits voltage excursion to ≤14.4 V during 41.7 A surges, preventing latch-up or damage to 32-bit ARM-based controller inputs. | Use Scenario: LIN bus lines and switched 12 V loads (e.g., door locks, window motors) in vehicle body control units. IC Role / Device Role / Timing Role: Unidirectional suppression on power rails and data lines to absorb load dump spikes and ISO 7637-2 Pulse 1/2a/3a transients. Use Value: Withstands 100 A non-repetitive forward surge (IFSM), enabling reliable protection even during simultaneous actuator switching events. |
| Consumer Power Adapter Input | Telecom Ethernet Port Protection |
Use Scenario: Secondary-side DC output of AC/DC adapters powering USB-C PD devices or IoT hubs. IC Role / Device Role / Timing Role: Final-stage overvoltage clamp after bulk capacitance to prevent overvoltage damage to USB-PD controllers or Type-C port ICs. Use Value: 1.0 μA max leakage at 8.5 V avoids standby current penalty; 14.4 V VC ensures safe operation of 9 V–12 V input-rated PMICs. | Use Scenario: Low-voltage auxiliary power (12 V or 24 V) feeding PoE-powered network switches or base stations. IC Role / Device Role / Timing Role: Primary surge suppression on DC input rails upstream of DC/DC converters and Ethernet PHYs. Use Value: 600 W rating handles combined lightning-induced surges across multiple ports without thermal runaway due to RθJL = 20 °C/W. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A-M3/52 | Halogen-free, RoHS-compliant variant; identical electrical specs and SMB package. | No functional difference; selected where halogen-free compliance is mandated (e.g., EU medical equipment). | Choose M3/52 for halogen-free BOMs; same footprint, thermal, and protection performance as SMBJ8.5A-E3/52. |
| SMBJ8.5CA-E3/52 | Bidirectional version; symmetric VBR (9.44–10.4 V) and VC (14.4 V); no polarity marking. | Required for AC-coupled or bidirectional signal lines (e.g., RS-485, CAN FD) where reverse polarity transients occur. | Select CA variant only when protecting balanced differential pairs or AC signals; not interchangeable with unidirectional SMBJ8.5A-E3/52 without circuit review. |
Compared with SMBJ8.5A-M3/52, the SMBJ8.5A-E3/52 offers standard RoHS compliance without halogen restrictions; compared with SMBJ8.5CA-E3/52, it provides optimized clamping for DC-biased rails but cannot suppress negative-going transients on AC paths.
Availability
SMBJ8.5A-E3/52 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and consumer power adapter input stages requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ8.5A-E3/52 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, power efficiency, and AEC-Q qualification.
The SMBJ series is engineered for robust transient suppression in harsh environments-designed to meet IEC/EN 61000-4-x immunity standards while supporting automotive, industrial, and telecom applications demanding high surge endurance and low clamping voltage.
FAQ
What is the maximum clamping voltage of SMBJ8.5A-E3/52 under a 10/1000 µs surge?
The SMBJ8.5A-E3/52 has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 41.7 A using the standardized 10/1000 µs waveform. This value is measured per IEC 61000-4-5 test conditions and confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88392. The SMBJ8.5A-E3/52 maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C) with minimal drift.
Is SMBJ8.5A-E3/52 RoHS-compliant and lead-free?
Yes, SMBJ8.5A-E3/52 is RoHS-compliant and lead-free, with matte tin-plated leads that meet J-STD-002 and JESD 22-B102 solderability standards. The "E3" suffix explicitly denotes commercial-grade, RoHS-compliant construction per Vishay's ordering nomenclature. The device also satisfies JESD 201 Class 2 whisker resistance testing and UL 94 V-0 flammability requirements for its molding compound.
Can SMBJ8.5A-E3/52 be used in automotive applications?
SMBJ8.5A-E3/52 itself is commercial-grade; however, the functionally identical automotive-qualified variant is SMBJ8.5AHE3_B/H (or _B/I). That part carries AEC-Q101 qualification, extended temperature validation, and enhanced process controls. For automotive use, specify the HE3 suffix-SMBJ8.5A-E3/52 is not AEC-Q101 qualified and should not be deployed in safety-critical or temperature-extended automotive systems without redesign validation.
What is the thermal resistance and recommended PCB layout for SMBJ8.5A-E3/52?
The SMBJ8.5A-E3/52 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, as specified in Vishay's datasheet. To achieve rated 600 W pulse power, designers must implement these minimum pad dimensions and ensure adequate copper area for heat spreading. Smaller pads increase thermal impedance and reduce surge handling capability proportionally.
How does SMBJ8.5A-E3/52 differ from SMBJ8.5CA-E3/52?
SMBJ8.5A-E3/52 is unidirectional with cathode-band polarity marking and protects only positive-going transients relative to ground; SMBJ8.5CA-E3/52 is bidirectional, symmetric in both directions, and lacks polarity marking. Their VBR, VC, and PPPM values are identical, but the CA version is required for AC-coupled lines (e.g., RS-485, CAN, audio) where voltage reversals occur. They are not pin-compatible replacements without circuit modification.
SMBJ8.5A-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ8.5A-E3/52 FAQ
1.How can I place an order for SMBJ8.5A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5A-E3/52 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 SMBJ8.5A-E3/52 reliable?
The price and inventory of SMBJ8.5A-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5A-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ8.5A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5A-E3/52?
SMBJ8.5A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5A-E3/52 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 SMBJ8.5A-E3/52?
For technical support, including SMBJ8.5A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5A-E3/52 requirements.
6.How does Aetrix verify that SMBJ8.5A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5A-E3/52 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 SMBJ8.5A-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ8.5A-E3/52?
All SMBJ8.5A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5A-E3/52, 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 SMBJ8.5A-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ8.5A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5A-E3/52 Tags
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