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Vishay General Semiconductor - Diodes Division SMBG8.5AHE3/5B
- Part No.:
- SMBG8.5AHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG8.5AHE3/5B.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,621
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Product details
Overview
SMBG8.5AHE3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in 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 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 interfaces, industrial I/O modules, and DC power rail protection.
For engineers reviewing the SMBG8.5AHE3/5B datasheet, SMBG8.5AHE3/5B pinout, SMBG8.5AHE3/5B application, or SMBG8.5AHE3/5B equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, DO-215AA (SMBG) package compatibility, and verified clamping performance under repetitive surge conditions per IEC 61000-4-5.
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). Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and repeatable breakdown behavior across temperature.
Designed for transient suppression per IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge), it delivers 20 A peak pulse current (IPPM) with 14.4 V clamping, enabling reliable protection of downstream 5 V–12 V logic and analog circuitry without latch-up or thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for 9 V nominal supply rails. |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - Confirmed breakdown threshold ensuring predictable turn-on margin above VWM. |
| VC @ IPPM | 14.4 V at 20 A - Clamped voltage during 10/1000 μs surge; limits stress on protected ICs such as CAN transceivers or microcontroller GPIOs. |
| PPPM | 600 W - Peak pulse power handling capability; supports repeated surges up to 0.01% duty cycle without degradation. |
| IFSM | 100 A - Non-repetitive forward surge rating (8.3 ms half-sine); enables survival of high-energy inductive switch-off events. |
| TJ max | +150 °C - Maximum junction temperature; allows operation in under-hood automotive environments and sealed industrial enclosures. |
| Leakage @ VWM | ≤1.0 μA - Ultra-low reverse leakage preserves battery life and signal integrity in always-on sensor nodes. |
Pinout & Package
Package: SMBG (DO-215AA) - surface-mount, low-profile gull-wing package with matte tin-plated leads; meets UL 94 V-0, MSL Level 1 (260 °C reflow), and AEC-Q101 qualification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line (e.g., CAN_H, 12 V rail); conducts transient energy to ground when VLINE exceeds VBR. |
| Anode | Reference/ground return path | Typically tied to system ground plane; completes clamping loop and establishes reference for VWM/VBR thresholds. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress - suitable for engine control, ADAS sensors, and infotainment power rails. |
| 600 W peak pulse power (10/1000 μs) | Withstands repeated lightning-induced surges per IEC 61000-4-5 Level 3 (1 kV/2 kV line-earth) without parameter shift or failure. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients - critical for protecting 3.3 V and 5 V logic inputs with tight absolute maximum ratings. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage under humidity, thermal cycling, and bias stress - essential for 10+ year industrial deployments. |
| MSL Level 1 moisture sensitivity | Enables standard SMT assembly without baking; compatible with high-volume automated placement and lead-free reflow profiles up to 260 °C peak. |
Applications
| Automotive Sensor Interface | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting LIN bus transceivers and temperature/pressure sensor outputs from load dump and ISO 7637-2 pulses in vehicle body electronics. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between signal line and chassis ground to clamp transients before they reach the sensor ASIC input stage. Use Value: Maintains signal integrity during 12 V system load dump events (up to +35 V, 400 ms) by limiting voltage to ≤14.4 V at 20 A surge. | Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on the input front-end, positioned ahead of optocoupler or Schmitt trigger input conditioning. Use Value: Prevents false triggering and component damage by clamping induced spikes (e.g., 1 kV/500 A surge) within 1 ns response time and <14.4 V clamping. |
| DC Power Rail Protection | USB Type-C VBUS Line |
Use Scenario: Secondary surge protection on 5 V/12 V DC-DC converter outputs feeding sensitive MCU or memory subsystems. IC Role / Device Role / Timing Role: Fast-acting parallel clamp that activates only during overvoltage excursions, preserving normal regulation and efficiency. Use Value: Limits transient overshoot to ≤14.4 V during hot-swap or capacitor inrush events, preventing latch-up in downstream LDOs and PMICs. | Use Scenario: Overvoltage guard on USB Type-C VBUS lines subject to accidental 20 V adapter misconnection or ESD coupling. IC Role / Device Role / Timing Role: Standby protection element that remains non-conductive at 5 V–20 V steady-state but clamps >20 V faults to safe levels. Use Value: Enables compliance with USB PD 3.1 fault tolerance requirements by clamping VBUS to <14.4 V before internal port controller damage occurs. |
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), identical VBR and VC, but rated for 600 W with 8.3 ms surge waveform instead of 10/1000 μs; lower IPPM (17.3 A). | Optimized for shorter-duration surges (e.g., EFT bursts); less effective for longer 10/1000 μs lightning surges. | Select SMBG8.5AHE3/5B when IEC 61000-4-5 compliance is required; choose SMBJ8.5A-E3/5B for IEC 61000-4-4 focused designs. |
| 1.5SMC8.5A | Same electrical specs but in larger SMC (DO-214AB) package; higher thermal mass, RθJA = 65 °C/W vs. 100 °C/W for SMBG. | Better suited for high-ambient-temperature PCB layouts where SMBG's 100 °C/W thermal resistance may limit power derating. | Prefer SMBG8.5AHE3/5B for space-constrained automotive modules; use 1.5SMC8.5A where board area permits and thermal headroom is critical. |
Compared with SMBJ8.5A-E3/5B and 1.5SMC8.5A, SMBG8.5AHE3/5B uniquely combines AEC-Q101 qualification, DO-215AA footprint, and validated 10/1000 μs surge performance - making it the preferred choice for compact, automotive-grade transient protection where both reliability and layout density are prioritized.
Availability
SMBG8.5AHE3/5B is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC input conditioning, and DC power rail safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMBG8.5AHE3/5B 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 qualification.
The SMBG series is engineered specifically for high-reliability transient suppression in space-constrained, thermally demanding environments - targeting automotive, industrial, and telecom infrastructure applications where AEC-Q101 compliance and consistent clamping performance are mandatory.
FAQ
What is the clamping voltage of SMBG8.5AHE3/5B at its rated peak pulse current?
The SMBG8.5AHE3/5B has a maximum clamping voltage (VC) of 14.4 V at 20 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuits during surge events - a critical parameter for ensuring compatibility with 5 V and 12 V IC absolute maximum ratings. The SMBG8.5AHE3/5B maintains this clamping performance across its full operating temperature range.
Is SMBG8.5AHE3/5B qualified for automotive applications?
Yes, SMBG8.5AHE3/5B is AEC-Q101 qualified, as confirmed by Vishay's official documentation and ordering code suffix "HE3". This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD robustness - validating its suitability for under-hood and cabin electronics such as body control modules, sensor interfaces, and infotainment power supplies. The SMBG8.5AHE3/5B meets automotive-grade reliability requirements without derating.
What does the "5B" suffix mean in SMBG8.5AHE3/5B?
The "5B" suffix in SMBG8.5AHE3/5B indicates packaging in a 13-inch diameter plastic tape-and-reel format with a base quantity of 3200 units per reel. This contrasts with "52", which denotes a 7-inch reel containing 750 units. Both formats use the same SMBG (DO-215AA) package and electrical specifications; the "5B" variant is optimized for high-volume SMT production lines requiring extended reel life and reduced changeover frequency. The SMBG8.5AHE3/5B is RoHS compliant and halogen-free.
How does SMBG8.5AHE3/5B differ from bidirectional TVS diodes like SMBG8.5CA?
SMBG8.5AHE3/5B is unidirectional, meaning it conducts only in reverse bias above VBR and blocks forward current - ideal for DC power lines and single-polarity signal paths. In contrast, SMBG8.5CA is bidirectional with symmetrical clamping in both directions, suited for AC lines or differential buses like RS-485. The SMBG8.5AHE3/5B features a cathode band marking and exhibits forward voltage drop (~3.5 V at 50 A), while SMBG8.5CA has no polarity marking and identical VBR in both directions.
What is the maximum operating temperature range for SMBG8.5AHE3/5B?
The SMBG8.5AHE3/5B has an operating junction and storage temperature range of -55 °C to +150 °C, as specified in Vishay's datasheet Document Number 88456. This wide range supports deployment in extreme environments such as automotive engine compartments, industrial motor drives, and outdoor telecom equipment. Derating of peak pulse power begins above 25 °C ambient per Figure 2 in the datasheet, and the SMBG8.5AHE3/5B maintains full specification compliance within this thermal envelope.
SMBG8.5AHE3/5B 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG8.5AHE3/5B FAQ
1.How can I place an order for SMBG8.5AHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG8.5AHE3/5B 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 SMBG8.5AHE3/5B reliable?
The price and inventory of SMBG8.5AHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG8.5AHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBG8.5AHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG8.5AHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG8.5AHE3/5B?
SMBG8.5AHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG8.5AHE3/5B 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 SMBG8.5AHE3/5B?
For technical support, including SMBG8.5AHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG8.5AHE3/5B requirements.
6.How does Aetrix verify that SMBG8.5AHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG8.5AHE3/5B 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 SMBG8.5AHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBG8.5AHE3/5B?
All SMBG8.5AHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG8.5AHE3/5B, 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 SMBG8.5AHE3/5B part is unused and in its original packaging.
Return procedure for SMBG8.5AHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG8.5AHE3/5B Tags
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