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Vishay General Semiconductor - Diodes Division SMBG85A-E3/5B
- Part No.:
- SMBG85A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG85A-E3/5B.pdf
- Description:
- TVS DIODE 85VWM 137VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,147
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Product details
Overview
SMBG85A-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 DC power rails and signal lines. It features 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 137 V maximum clamping voltage (VC) at 4.4 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 μs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMBG85A-E3/5B datasheet, SMBG85A-E3/5B pinout, SMBG85A-E3/5B application, or SMBG85A-E3/5B equivalent, key selection criteria include clamping performance under 4.4 A surge, thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification, unidirectional polarity with cathode band marking, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert transient energy away from downstream circuitry. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at 85 V), while the low incremental surge resistance enables rapid voltage limiting during fast transients.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL level 1 per J-STD-020 (peak reflow 260 °C), and is qualified to AEC-Q101 for automotive under-hood applications - confirming reliability under thermal cycling, humidity, and mechanical stress conditions typical of engine control units and body electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 12 V/24 V/48 V systems. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - tight breakdown window ensures predictable turn-on without premature conduction. |
| VC @ IPPM | 137 V at 4.4 A - clamping voltage limits downstream voltage stress during 10/1000 μs surge events. |
| PPPM | 600 W - peak pulse power handling capability with standard lightning/surge waveform (IEC 61000-4-5). |
| TJ max. | +150 °C - enables use in high-temperature environments such as automotive power modules and motor drives. |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on recommended 5.0 mm × 5.0 mm copper pads. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD. |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, low-profile gull-wing leadframe with matte tin-plated terminals solderable per J-STD-002. Cathode identified by molded band on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected circuit ground or low-side return path. | Provides reference node for clamping action; must be routed with low-inductance path to ground plane. |
| Cathode | Current exit terminal in forward bias; marked with band; connected to protected line (e.g., 24 V rail or CAN_H). | Defines polarity-sensitive connection point - reversal prevents clamping and risks device failure. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 Level 3/4 surges without derating on standard PCB layouts. |
| Glass passivated junction | Ensures stable VBR over time and temperature, minimizing drift in critical safety-critical circuits. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain and chassis applications requiring zero-defect reliability. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without preconditioning or special handling. |
| Low profile SMBG package | Reduces board space vs. SMA/SMB; compatible with high-density routing and automated optical inspection (AOI). |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Digital Input Module |
|---|---|
Use Scenario: Protection of 24 V supply rail against load dump transients up to 120 V and inductive switching spikes from solenoid drivers. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between 24 V rail and chassis ground to clamp surges within 1 ns response time. Use Value: Limits rail voltage to ≤137 V during 600 W surges, preventing damage to MCU power regulators and CAN transceivers. | Use Scenario: Guarding 24 V digital input channels against field-wiring induced transients and ESD from operator interaction. IC Role / Device Role / Timing Role: Standoff-rated TVS on each input line, operating below 85 V normal state and clamping above 94.4 V. Use Value: Maintains signal integrity during 4 kV ESD (IEC 61000-4-2) and 1 kV burst noise (IEC 61000-4-4) without latch-up or degradation. |
| Telecom Power Supply Front-End | Motor Drive Gate Driver Protection |
Use Scenario: Secondary-side overvoltage suppression on 48 V telecom rectifier outputs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device parallel to bulk capacitor, activated only during >94.4 V excursions. Use Value: Absorbs 600 W pulses without thermal runaway, preserving hold-up time and avoiding crowbar shutdown. | Use Scenario: Protecting isolated gate driver supplies (e.g., 15 V) from Miller-induced voltage spikes during IGBT switching. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp referenced to driver ground, placed adjacent to gate driver IC. Use Value: Clamps gate-source voltage to safe levels (<137 V) during dV/dt-induced coupling, preventing false turn-on or oxide breakdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85A-E3/5B | Same VWM (85 V), identical SMB package, but lower PPPM (600 W same), slightly higher VC (139 V vs. 137 V). | Functionally interchangeable in most 24 V/48 V rail protection; minor clamping voltage difference affects margin in high-precision sensing paths. | Select SMBJ85A-E3/5B if legacy design uses SMBJ footprint and no AEC-Q101 requirement exists. |
| SMBG85CA-E3/5B | Bidirectional variant: same VWM (85 V), symmetric breakdown (±94.4 V), no polarity marking, ID doubled for ≤10 V types (not applicable here). | Required only for AC-coupled or differential signal lines (e.g., RS-485, CAN); unsuitable for DC rail protection due to dual-direction conduction. | Choose SMBG85CA-E3/5B only when protecting bidirectional data lines where reverse polarity surges occur. |
Compared with SMBJ85A-E3/5B and SMBG85CA-E3/5B, the SMBG85A-E3/5B offers AEC-Q101 qualification and optimized unidirectional clamping for DC power rails - making it preferred for automotive and industrial control where reliability and polarity-specific protection are mandatory.
Availability
SMBG85A-E3/5B is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom power supplies, and motor drive systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBG85A-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, TVS devices, and optoelectronics with emphasis on high-reliability, high-power, and automotive-qualified components.
The SMBG series was developed to deliver AEC-Q101-compliant transient protection in compact surface-mount packages for next-generation automotive and industrial power electronics demanding robustness and precision clamping.
FAQ
What is the maximum clamping voltage of the SMBG85A-E3/5B under standard surge conditions?
The SMBG85A-E3/5B has a maximum clamping voltage (VC) of 137 V at 4.4 A peak pulse current (IPPM), measured with a 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in the Vishay datasheet Document Number 88456, page 2. The SMBG85A-E3/5B maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is the SMBG85A-E3/5B suitable for automotive applications?
Yes, the SMBG85A-E3/5B is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet (Document Number 88456, page 1 and page 3). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, confirming its suitability for under-hood and chassis applications. The SMBG85A-E3/5B is commonly deployed in engine control units, body control modules, and ADAS power domains.
How does the SMBG85A-E3/5B differ from the SMBJ85A-E3/5B?
The SMBG85A-E3/5B and SMBJ85A-E3/5B share identical VWM (85 V), package (SMBG vs. SMB - mechanically compatible), and PPPM (600 W), but differ in qualification and clamping: SMBG85A-E3/5B is AEC-Q101 qualified and has VC = 137 V, while SMBJ85A-E3/5B has VC = 139 V and lacks AEC-Q101 certification. The SMBG85A-E3/5B also uses DO-215AA outline versus DO-214AA for SMBJ.
What is the thermal resistance of the SMBG85A-E3/5B, and how does it affect layout?
The SMBG85A-E3/5B 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 the Vishay datasheet (page 3). To maintain safe junction temperatures during repetitive surges, PCB layout must provide adequate copper area and avoid thermal bottlenecks - insufficient copper increases RθJA and risks thermal runaway during sustained transient activity.
Does the SMBG85A-E3/5B have polarity marking, and how is it oriented in circuit?
Yes, the SMBG85A-E3/5B is unidirectional and features a cathode band marking on the case body. In circuit, the cathode (banded end) connects to the line being protected (e.g., 24 V rail), and the anode connects to ground. Reversing this orientation disables clamping functionality and may cause catastrophic failure under overvoltage. The Vishay datasheet confirms polarity marking on page 5 (package outline) and page 1 (polarity note).
SMBG85A-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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 4.4A
- 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)
SMBG85A-E3/5B FAQ
1.How can I place an order for SMBG85A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG85A-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 SMBG85A-E3/5B reliable?
The price and inventory of SMBG85A-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 SMBG85A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBG85A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG85A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG85A-E3/5B?
SMBG85A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG85A-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 SMBG85A-E3/5B?
For technical support, including SMBG85A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG85A-E3/5B requirements.
6.How does Aetrix verify that SMBG85A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG85A-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 SMBG85A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBG85A-E3/5B?
All SMBG85A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG85A-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 SMBG85A-E3/5B part is unused and in its original packaging.
Return procedure for SMBG85A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG85A-E3/5B Tags
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