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Vishay General Semiconductor - Diodes Division SMBG8.5A-E3/52
- Part No.:
- SMBG8.5A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG8.5A-E3/52.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO215AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBG8.5A-E3/52 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) 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 20 A peak pulse current (IPPM), and 600 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMBG8.5A-E3/52 datasheet, SMBG8.5A-E3/52 pinout, SMBG8.5A-E3/52 application, or SMBG8.5A-E3/52 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.45), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2" × 0.2" 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), limiting transient-induced voltage excursions to ≤14.4 V at 20 A. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM).
Thermal performance is defined by RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), enabling reliable operation up to TJ = +150 °C. The device meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability requirements for molded compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level DC rail margin. |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - Confirmed breakdown range ensures predictable turn-on across production lot and temperature. |
| VC @ IPPM | 14.4 V at 20 A (10/1000 μs) - Clamping voltage directly limits stress on downstream ICs like microcontrollers or CAN transceivers. |
| PPPM | 600 W - Peak surge power handling capability under standardized lightning/surge test conditions (IEC 61000-4-5). |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage preserves battery life and avoids false triggering in low-power sensor nodes. |
| TJ max. | +150 °C - Enables deployment in under-hood automotive environments and thermally constrained industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, low-profile gull-wing lead frame with matte tin-plated terminals solderable per J-STD-002 and JESD22-B102. Cathode indicated by band marking on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; defines current path during transient clamp event. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 12 V supply or LIN bus); carries full surge current into ground via anode. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables compliance with IEC 61000-4-5 Level 3 (1 kV line-to-ground, 2 kV line-to-line) without derating. |
| Clamping ratio VC/VBR ≈ 1.45 | Minimizes overvoltage overshoot during fast transients, protecting 3.3 V and 5 V logic interfaces downstream. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without moisture-related popcorning or delamination. |
| Glass-passivated junction | Ensures long-term stability of VBR and low parametric drift over temperature and lifetime. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules requiring zero-failure field performance. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-supplied ECUs from load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between battery rail and ground, activated within <1 ns to limit voltage to ≤14.4 V. Use Value: Prevents latch-up or permanent damage to MCU power domains and analog front-ends during vehicle cranking or alternator failure events. |
Use Scenario: Safeguarding 4–20 mA current loop inputs on PLC analog I/O modules against ESD and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS connected across input terminals, clamping transients before they reach precision op-amps or ADC drivers. Use Value: Maintains measurement integrity and eliminates field failures caused by 8 kV contact ESD or relay coil flyback in factory automation systems. |
| Consumer USB Port ESD Protection | Telecom DSL Line Surge Suppression |
|
Use Scenario: Secondary-level ESD protection on VBUS line of USB Type-A receptacles in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of polyfuse and USB switch, absorbing ±15 kV air discharge per IEC 61000-4-2. Use Value: Complements primary polymer PTC and integrated ESD diodes by handling higher-energy surges without degradation or leakage increase. |
Use Scenario: Primary surge protection on DSL line interface cards exposed to lightning-induced surges on outside plant wiring. IC Role / Device Role / Timing Role: Front-end unidirectional TVS in series with gas discharge tube (GDT), clamping induced common-mode transients before hybrid transformer. Use Value: Limits peak voltage to safe levels for line driver ICs while maintaining low capacitance (<100 pF) to avoid signal attenuation at 2 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A-E3/52 | Same VWM (8.5 V), identical SMB (DO-214AA) package but slightly larger footprint (0.205" × 0.135") vs. SMBG (0.235" × 0.130"); RθJA = 85 °C/W (vs. 100 °C/W). | Higher thermal efficiency allows marginally higher sustained surge duty cycles; less suitable for ultra-dense layouts where SMBG's smaller outline is critical. | Select SMBJ8.5A-E3/52 when board space permits and thermal headroom is prioritized over minimal footprint. |
| 1.5SMC8.5A | Same electrical specs (VWM, VBR, VC), but in larger SMC (DO-214AB) package (0.275" × 0.195"); rated for same 600 W but with lower RθJA (60 °C/W). | Lower thermal resistance supports higher average power dissipation in high-repetition surge environments (e.g., motor drive feedback lines). | Choose 1.5SMC8.5A for industrial drives or inverters where surge repetition rate exceeds 0.01% duty cycle and PCB area is available. |
Compared with SMBG8.5A-E3/52, SMBJ8.5A-E3/52 offers better thermal performance in a marginally larger footprint, while 1.5SMC8.5A delivers superior heat dissipation in a significantly larger package - making SMBG8.5A-E3/52 optimal for space-constrained AEC-Q101-compliant automotive modules where MSL Level 1 and gull-wing manufacturability are essential.
Availability
SMBG8.5A-E3/52 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and consumer USB power delivery systems requiring stable component supply, AEC-Q101 validation, and RoHS-compliant manufacturing.
Supply support for SMBG8.5A-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 automotive qualification.
The SMBG series was engineered specifically for high-reliability surface-mount transient suppression in space-constrained, thermally demanding applications - targeting automotive, industrial, and telecom infrastructure where AEC-Q101 compliance and MSL Level 1 reflow compatibility are mandatory.
FAQ
What is the maximum clamping voltage of SMBG8.5A-E3/52 at its rated peak pulse current?
The SMBG8.5A-E3/52 has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current (IPPM) of 20 A under the standard 10/1000 μs waveform. This value is measured per Figure 1 in Vishay Document 88456 and represents the upper bound of voltage seen by protected circuitry during worst-case surge events - critical for ensuring compatibility with 12 V system ICs.
Is SMBG8.5A-E3/52 suitable for bidirectional transient protection?
No, SMBG8.5A-E3/52 is a unidirectional TVS diode, as indicated by the "A" suffix and absence of "CA" in the part number. It conducts only in reverse bias above VBR and blocks forward current beyond VF ≈ 3.5 V at 50 A. For bidirectional protection, use SMBG8.5CA-E3/52, which provides symmetrical clamping in both polarities.
Does SMBG8.5A-E3/52 meet automotive reliability standards?
Yes, SMBG8.5A-E3/52 is AEC-Q101 qualified, as confirmed in the Vishay datasheet revision 09-Jan-2024 (Document Number: 88456). This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD - validating its use in automotive powertrain, body electronics, and ADAS modules.
What is the moisture sensitivity level (MSL) rating for SMBG8.5A-E3/52?
SMBG8.5A-E3/52 is rated MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. This means it can be stored indefinitely at ambient conditions and processed through standard lead-free reflow profiles without baking - simplifying SMT line integration for high-volume automotive and industrial manufacturing.
How does the SMBG package differ from SMB in mechanical terms?
The SMBG (DO-215AA) package used by SMBG8.5A-E3/52 features a modified gull-wing leadform with tighter pitch (0.058" vs. SMB's 0.065"), shorter body length (0.235" vs. 0.205"), and optimized thermal pad layout - resulting in a 12% smaller footprint than SMB (DO-214AA). This enables higher board density while maintaining 600 W surge capability and MSL Level 1 compatibility.
SMBG8.5A-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- 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 (SMBG)
SMBG8.5A-E3/52 FAQ
1.How can I place an order for SMBG8.5A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG8.5A-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 SMBG8.5A-E3/52 reliable?
The price and inventory of SMBG8.5A-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 SMBG8.5A-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBG8.5A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG8.5A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG8.5A-E3/52?
SMBG8.5A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG8.5A-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 SMBG8.5A-E3/52?
For technical support, including SMBG8.5A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG8.5A-E3/52 requirements.
6.How does Aetrix verify that SMBG8.5A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG8.5A-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 SMBG8.5A-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBG8.5A-E3/52?
All SMBG8.5A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG8.5A-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 SMBG8.5A-E3/52 part is unused and in its original packaging.
Return procedure for SMBG8.5A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG8.5A-E3/52 Tags
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