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Vishay General Semiconductor - Diodes Division SMBG8.5A-E3/5B
- Part No.:
- SMBG8.5A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG8.5A-E3/5B.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,567
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Product details
Overview
SMBG8.5A-E3/5B 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, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor signal lines, industrial I/O interfaces, and DC power rail protection.
For engineers reviewing the SMBG8.5A-E3/5B datasheet, SMBG8.5A-E3/5B pinout, SMBG8.5A-E3/5B application, or SMBG8.5A-E3/5B equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, 150 °C max junction temperature, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below 8.5 V and rapidly transitions to low-impedance conduction above its 9.44–10.4 V breakdown threshold. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching transients.
The SMBG8.5A-E3/5B delivers 20 A peak pulse current (IPPM) under 10/1000 μs waveform while maintaining clamping at ≤14.4 V, resulting in low incremental surge resistance (~0.72 Ω). It is rated for -55 °C to +150 °C operation, meets UL 497B recognition (QVGQ2), and is qualified to AEC-Q101 for automotive under-hood and chassis applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on margin |
| VC @ IPPM | 14.4 V at 20 A - Clamping voltage limiting downstream circuit stress during surge events |
| PPPM | 600 W - Peak pulse power handling capability with 10/1000 μs waveform, 0.01% duty cycle |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage preserving signal integrity in high-impedance circuits |
| TJ max | +150 °C - Enables use in under-hood automotive environments and thermally constrained PCBs |
| MSL Level | Level 1 per J-STD-020 - Supports standard reflow without dry-pack or bake requirements |
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 JESD 22-B102. Cathode indicated by band marking; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction (e.g., during surge clamp in reverse bias) | Connected to protected line (e.g., signal or power rail); must be routed with low-inductance path to ground |
| Cathode | Current exit terminal during clamping; marked with band | Connected to system ground or low-impedance return path; defines unidirectional polarity orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification |
| Glass passivated junction | Ensures stable VBR tolerance, low leakage drift over life, and immunity to humidity-induced degradation |
| 600 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV surge) compliance when properly laid out with 5.0 mm × 5.0 mm thermal pads |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes voltage overshoot during transients, protecting 12 V logic interfaces and automotive microcontrollers |
| MSL Level 1 rating | Enables direct placement into standard SMT reflow profiles without moisture sensitivity concerns |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and jump-start transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between signal line and chassis ground, responding within <1 ns to limit voltage excursion. Use Value: Maintains signal integrity below 8.5 V normal operation while clamping surges to ≤14.4 V - compatible with 16 V-rated automotive interface ICs. | Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Standoff protector on 24 V DC input channels, absorbing repetitive 600 W pulses without degradation. Use Value: Enables >100,000 surge cycles per IEC 61000-4-5 due to low thermal resistance (RθJL = 20 °C/W) and robust silicon construction. |
| DC Power Rail Protection | Consumer USB Port ESD Protection |
Use Scenario: Secondary overvoltage protection on 5 V or 12 V DC-DC converter outputs feeding FPGAs, memory, or PMICs. IC Role / Device Role / Timing Role: Fast-clamp shunt device placed adjacent to load, diverting surge energy away from downstream ICs. Use Value: Limits rail overshoot to ≤14.4 V during 20 A transients - preventing latch-up or gate oxide damage in sensitive loads. | Use Scenario: ESD protection for USB 2.0 data lines (D+/D−) in portable devices where space and capacitance are critical. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS (typ. CJ < 100 pF at 0 V) placed inline with signal traces. Use Value: Provides ±15 kV air/±8 kV contact ESD immunity (IEC 61000-4-2) without distorting 480 Mbps data signals. |
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-E3/5B | Same VWM (8.5 V), but lower PPPM (600 W vs. SMBJ's 600 W - identical rating); SMBJ uses DO-214AA package (slightly larger footprint, higher RθJA) | SMBJ8.5A-E3/5B has 120 °C max TJ and no AEC-Q101 qualification - unsuitable for automotive under-hood use | Select SMBG8.5A-E3/5B when AEC-Q101 compliance, +150 °C operation, or tighter board space (SMBG vs. SMBJ) is required |
| 1.5SMC8.5A | Same electrical specs (VWM, VBR, VC), but in larger SMC (DO-214AB) package; higher RθJA (60 °C/W) limits power handling in compact layouts | 1.5SMC8.5A supports same surge levels but requires larger PCB area and exhibits slower thermal recovery in repetitive surge scenarios | Choose SMBG8.5A-E3/5B for space-constrained designs needing superior thermal performance (RθJL = 20 °C/W) and automotive qualification |
Compared with SMBJ8.5A-E3/5B and 1.5SMC8.5A, the SMBG8.5A-E3/5B offers identical clamping performance in a smaller, AEC-Q101-qualified package with lower junction-to-lead thermal resistance - making it optimal for automotive and high-density industrial PCBs where reliability and layout efficiency are critical.
Availability
SMBG8.5A-E3/5B is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and DC power distribution systems requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant surge protection.
Supply support for SMBG8.5A-E3/5B 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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SMBG series was engineered specifically for high-reliability transient suppression in space-constrained, thermally demanding environments - targeting automotive, industrial control, and telecom infrastructure applications where AEC-Q101 compliance and low-profile packaging are mandatory.
FAQ
What is the maximum clamping voltage of SMBG8.5A-E3/5B at its rated peak pulse current?
The SMBG8.5A-E3/5B has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated 20 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is guaranteed across temperature and ensures downstream components experience limited overvoltage stress during surge events. The SMBG8.5A-E3/5B maintains this clamping performance consistently due to its glass-passivated junction and low incremental surge resistance.
Is SMBG8.5A-E3/5B qualified for automotive applications?
Yes, SMBG8.5A-E3/5B is AEC-Q101 qualified - verified for automotive-grade reliability including temperature cycling, high-temperature reverse bias (HTRB), and ESD testing. Its +150 °C maximum junction temperature and MSL Level 1 rating make it suitable for under-hood and chassis-mounted systems. The SMBG8.5A-E3/5B meets UL 497B recognition (QVGQ2) and is commonly used in automotive sensor units and body control modules.
What is the reverse leakage current of SMBG8.5A-E3/5B at its stand-off voltage?
The SMBG8.5A-E3/5B exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 8.5 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage preserves signal integrity in high-impedance circuits such as sensor bias networks and analog front-ends. The SMBG8.5A-E3/5B maintains leakage below 5 μA up to +125 °C, supporting stable operation across automotive temperature ranges.
Does SMBG8.5A-E3/5B have polarity markings, and how is it oriented on the PCB?
Yes, SMBG8.5A-E3/5B is unidirectional and features a cathode band marking on the package body. During PCB layout, the banded end must connect to system ground (or the lowest potential reference), while the anode connects to the line being protected. Incorrect orientation renders the device non-functional for surge suppression. The SMBG8.5A-E3/5B's polarity is critical - unlike bidirectional variants (e.g., SMBG8.5CA), it conducts only in reverse breakdown mode.
What is the thermal resistance profile of SMBG8.5A-E3/5B, and why does it matter for surge handling?
The SMBG8.5A-E3/5B has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient (RθJA) of 100 °C/W when mounted on 5.0 mm × 5.0 mm copper pads. Low RθJL enables rapid heat dissipation from the silicon die into the PCB leads during short-duration surges, preventing thermal runaway. This allows the SMBG8.5A-E3/5B to sustain repetitive 600 W pulses without degradation - essential for industrial equipment exposed to frequent switching transients.
SMBG8.5A-E3/5B 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-E3/5B FAQ
1.How can I place an order for SMBG8.5A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG8.5A-E3/5B 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 SMBG8.5A-E3/5B reliable?
The price and inventory of SMBG8.5A-E3/5B 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-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBG8.5A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG8.5A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG8.5A-E3/5B?
SMBG8.5A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG8.5A-E3/5B 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 SMBG8.5A-E3/5B?
For technical support, including SMBG8.5A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG8.5A-E3/5B requirements.
6.How does Aetrix verify that SMBG8.5A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG8.5A-E3/5B 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 SMBG8.5A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBG8.5A-E3/5B?
All SMBG8.5A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG8.5A-E3/5B, 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 SMBG8.5A-E3/5B part is unused and in its original packaging.
Return procedure for SMBG8.5A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG8.5A-E3/5B Tags
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