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Vishay General Semiconductor - Diodes Division SMBG8.5A/54
- Part No.:
- SMBG8.5A/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG8.5A/54.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,696
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Product details
Overview
SMBG8.5A/54 from Littelfuse is a unidirectional surface-mount transient voltage suppressor (TVS) designed for robust overvoltage protection in DC power rails and signal lines. It features a 8.5 V reverse stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR), 14.4 V clamping voltage (VC) at 41.7 A peak pulse current, and 600 W peak pulse power handling with 10/1000 µs waveform - used to safeguard microcontrollers, sensors, and communication interfaces against ESD and lightning-induced surges.
For engineers reviewing the SMBG8.5A/54 datasheet, SMBG8.5A/54 pinout, SMBG8.5A/54 application, or SMBG8.5A/54 equivalent, this device is selected where low-leakage (<1.0 µA at VWM), fast response (<1.0 ps), and DO-214AA gull-wing packaging are required for space-constrained industrial and automotive PCB layouts.
Technical Context
This unidirectional TVS diode uses a glass-passivated junction and low incremental surge resistance to achieve precise clamping with minimal voltage overshoot during transient events. Its 10/1000 µs surge rating is validated under JEDEC-standard mounting conditions (0.2 × 0.2 inch copper pads), and it operates across –55 °C to +150 °C junction temperature range.
The SMBG8.5A/54 is rated for 100 A non-repetitive forward surge current (IFSM) and exhibits a maximum forward voltage of 3.5 V at 50 A - confirming suitability for high-energy, low-duty-cycle transients such as IEC 61000-4-5 surge events on power inputs and data lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 8.5 V - maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 9.44–10.4 V at 1.0 mA test current - defines onset of avalanche conduction |
| Clamping Voltage (VC) | 14.4 V at 41.7 A peak pulse current - limits protected circuit voltage during surge |
| Peak Pulse Power (PPPM) | 600 W with 10/1000 µs waveform - supports lightning-surge immunity per IEC 61000-4-5 Level 3 |
| Leakage Current (ID) | <1.0 µA at VWM - ensures negligible standby power loss in battery-powered systems |
| Response Time | <1.0 ps - enables protection of high-speed digital interfaces without signal distortion |
| Operating Temperature | –55 °C to +150 °C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
Package: DO-214AA (SMBG) gull-wing surface-mount package per JEDEC standard; 0.205 × 0.220 inch body with 0.030 inch lead pitch; polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (non-banded end) | Input/Line side | Connected to protected line (e.g., 12 V rail or RS-485 A/B); conducts surge current toward cathode |
| Cathode (banded end) | Ground reference | Connected to system ground plane; provides low-impedance path for transient energy dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling |
| Low incremental surge resistance | Minimizes VC rise under high IPPM, improving clamping precision for sensitive ICs |
| UL 94V-0 flammability rating | Meets safety requirements for enclosed industrial and transportation equipment |
| Built-in strain relief | Reduces mechanical stress on solder joints during board flexure or thermal expansion |
| High-temperature soldering tolerance | Withstands 250 °C for 10 seconds - compatible with lead-free reflow profiles |
Applications
| Automotive Power Input Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and bulk capacitor to clamp transients before they reach PMIC or MCU. Use Value: Clamps to 14.4 V at 41.7 A, preventing overvoltage damage while maintaining <1.0 µA leakage to preserve sleep-mode current budget. |
Use Scenario: 4–20 mA current-loop sensor nodes in factory automation cabinets. IC Role / Device Role / Timing Role: TVS mounted at terminal block entry to absorb induced surges from nearby motor switching. Use Value: Sub-1 ps response ensures protection of analog front-end op-amps and ADCs without affecting loop accuracy or settling time. |
| DC Power Supply Output Protection | RS-485 Transceiver Line Protection |
Use Scenario: Secondary-side 5 V/3.3 V outputs of isolated DC-DC converters in medical devices. IC Role / Device Role / Timing Role: TVS placed downstream of filter inductor to suppress cross-coupled noise and fast transients. Use Value: 600 W surge rating handles repetitive switching noise from adjacent SMPS stages without degradation. |
Use Scenario: Half-duplex RS-485 bus nodes in building management systems with long cable runs. IC Role / Device Role / Timing Role: Paired unidirectional TVS diodes (A/B to GND) protect transceiver I/O pins against ESD and cable discharge. Use Value: Low capacitance and fast response prevent signal edge degradation at up to 10 Mbps data rates. |
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 | Same VWM (8.5 V), identical VBR (9.44–10.4 V), but slightly higher VC = 14.5 V at 41.5 A; DO-214AA package, same gull-wing leadform | Valid for identical PCB footprints and functional requirements; minor VC difference has negligible impact on most 12 V rail protections | Select SMBJ8.5A if dual-sourcing is required and legacy design validation already covers SMBJ-series parameters |
| SMCJ8.5A | Higher PPPM = 1500 W, same VWM/VBR, larger DO-214AB package (0.265 × 0.285 inch); VC = 14.4 V at 104 A | Used where higher surge margin is mandated (e.g., outdoor telecom power inputs); requires PCB layout change due to larger footprint | Choose SMCJ8.5A only when 600 W is insufficient per system-level surge testing - not a drop-in replacement |
Compared with SMBG8.5A/54, SMBJ8.5A offers identical electrical performance and mechanical compatibility, making it a seamless second-source option; SMCJ8.5A delivers greater surge capacity but demands board redesign - neither is pin-compatible without layout verification.
Availability
SMBG8.5A/54 is available at Aetrix Electronics and suitable for automotive infotainment power conditioning, industrial PLC I/O protection, and medical device DC-DC output stabilization requiring stable component supply and full traceability.
Supply support for SMBG8.5A/54 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
Littelfuse is a global leader in circuit protection, specializing in fuses, TVS diodes, and overcurrent solutions for automotive, industrial, and consumer markets.
The SMBG series was engineered specifically for high-reliability surface-mount transient suppression in space-constrained, thermally demanding environments - emphasizing low leakage, tight VBR tolerance, and robust surge endurance.
FAQ
What is the clamping voltage of SMBG8.5A/54 and how is it measured?
The SMBG8.5A/54 has a maximum clamping voltage (VC) of 14.4 V, measured at a peak pulse current (IPPM) of 41.7 A using the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed per the manufacturer's electrical characteristics table and reflects worst-case voltage seen by downstream components during a surge event - critical for ensuring protected ICs remain within absolute maximum ratings.
Is SMBG8.5A/54 unidirectional or bidirectional, and how is polarity identified?
SMBG8.5A/54 is a unidirectional TVS diode. Polarity is marked by a color band on the cathode end of the DO-214AA package; the banded terminal must be connected to system ground, while the opposite (anode) terminal connects to the line being protected. Bidirectional variants use "C" or "CA" suffixes (e.g., SMBG8.5CA), which SMBG8.5A/54 does not carry.
What is the maximum leakage current of SMBG8.5A/54 at its stand-off voltage?
The SMBG8.5A/54 exhibits a maximum reverse leakage current (ID) of 1.0 µA when biased at its rated stand-off voltage of 8.5 V and tested at 25 °C ambient. This ultra-low leakage supports energy-sensitive applications such as battery-backed sensors and always-on monitoring circuits where quiescent current must be minimized.
Can SMBG8.5A/54 be used in automotive applications, and what temperature range does it support?
Yes, SMBG8.5A/54 is qualified for automotive use with a specified operating junction temperature range of –55 °C to +150 °C. Its construction - including glass-passivated junction, UL 94V-0 molding compound, and high-temperature soldering tolerance - meets AEC-Q101 stress-test requirements for under-hood and cabin-mounted electronics.
What is the peak pulse power rating of SMBG8.5A/54 and under what test conditions is it specified?
SMBG8.5A/54 is rated for 600 W peak pulse power (PPPM) with a 10/1000 µs waveform, tested at 25 °C ambient on 0.2 × 0.2 inch copper pads per JEDEC standards. This rating applies to single, non-repetitive surges at ≤0.01% duty cycle - aligning with IEC 61000-4-5 surge immunity testing for industrial and automotive equipment.
SMBG8.5A/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- Series:
- TransZorb®
- Packaging:
- Cut Tape (CT)
- 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/54 FAQ
1.How can I place an order for SMBG8.5A/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG8.5A/54 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/54 reliable?
The price and inventory of SMBG8.5A/54 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/54 is usually 5 days.
3.What payment methods are accepted for SMBG8.5A/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG8.5A/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG8.5A/54?
SMBG8.5A/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG8.5A/54 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/54?
For technical support, including SMBG8.5A/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG8.5A/54 requirements.
6.How does Aetrix verify that SMBG8.5A/54 is sourced from the original manufacturer or authorized distributors?
All SMBG8.5A/54 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/54 meets industry standards.
7.What is the process for return or replacement of SMBG8.5A/54?
All SMBG8.5A/54 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG8.5A/54, 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/54 part is unused and in its original packaging.
Return procedure for SMBG8.5A/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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