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Vishay General Semiconductor - Diodes Division SMBG85CAHE3/5B
- Part No.:
- SMBG85CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG85CAHE3/5B.pdf
- Description:
- TVS DIODE 85VWM 137VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,322
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Product details
Overview
SMBG85CAHE3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for robust overvoltage protection of sensitive electronics. 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, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMBG85CAHE3/5B datasheet, SMBG85CAHE3/5B pinout, SMBG85CAHE3/5B application, or SMBG85CAHE3/5B equivalent, key selection considerations include bidirectional clamping capability, AEC-Q101 qualification, low incremental surge resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector, responding within picoseconds to transients exceeding its VWM threshold. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity-dependent layout constraints in AC-coupled or floating signal paths.
It uses a glass-passivated silicon junction with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W, enabling reliable operation up to TJ = +150 °C. The SMBG (DO-215AA) package meets UL 94 V-0 and J-STD-020 MSL level 1 (260 °C peak reflow).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Confirmed breakdown range ensuring predictable turn-on margin |
| VC @ IPPM | 137 V at 4.4 A - Clamping voltage under 10/1000 μs surge defines worst-case protected node voltage |
| PPPM | 600 W - Peak pulse power handling capacity per single transient event |
| IFSM | Not applicable - Bidirectional device has no forward surge rating (unidirectional only) |
| TJ max | +150 °C - Maximum junction temperature supporting under-hood automotive use |
| Qualification | AEC-Q101 qualified - Validated for automotive-grade reliability and stress testing |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 6.48 mm × 3.94 mm × 2.41 mm (L × W × H); matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Acts as cathode during positive transients and anode during negative transients - symmetrical conduction |
| Cathode | Transient return path (bidirectional) | Acts as anode during positive transients and cathode during negative transients - no band marking required |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or ungrounded sensor outputs without polarity concerns |
| 600 W peak pulse power | Withstands high-energy transients such as ISO 7637-2 Pulse 1/2a/5a in automotive environments |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes voltage overshoot during clamping, reducing risk of downstream IC latch-up or damage |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies manufacturing logistics |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching spikes in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly across signal line and ground, clamping surges before they reach the protected IC. Use Value: Maintains signal integrity under ISO 16750-2 and ISO 7637-2 compliance tests while supporting AEC-Q100 grade 0/1 ICs. | Use Scenario: Safeguarding digital input/output channels of programmable logic controllers against ESD and relay coil flyback in factory automation systems. IC Role / Device Role / Timing Role: Standby-mode voltage clamp that activates only during overvoltage events, drawing zero steady-state current. Use Value: Enables >100 kV ESD immunity (IEC 61000-4-2) and 1 kV/μs surge immunity (IEC 61000-4-5) without signal attenuation or bandwidth loss. |
| Telecom Line Interface | Consumer Appliance Control Board |
Use Scenario: Protecting RS-485 transceivers and Ethernet PHYs in base station backhaul equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS placed at connector entry point to divert bulk surge energy before secondary protection stages. Use Value: Withstands repetitive 600 W pulses at 0.01% duty cycle, meeting Telcordia GR-1089-CORE requirements for central office equipment. | Use Scenario: Shielding microcontroller GPIOs and display driver lines in smart home appliances from user-handling ESD and motor commutation noise. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at 0 V) shunt protector preserving signal rise/fall times on 1–10 MHz control lines. Use Value: Prevents firmware lockup and display corruption during 8 kV contact ESD events per IEC 61000-4-2 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA | Same VWM (85 V), lower PPPM (600 W same), but higher VC (139 V vs. 137 V); non-AEC-Q101 rated | Lacks automotive qualification; suitable for industrial/commercial only | Select SMBG85CAHE3/5B when AEC-Q101 compliance and tighter clamping are required |
| SMAJ85CA | Lower PPPM (400 W), larger VC (139 V), same VWM; SMA package (DO-214AC), higher RθJA (140 °C/W) | Reduced surge handling and thermal performance; less suitable for high-reliability or dense layouts | Choose SMBG85CAHE3/5B for higher power density, better thermal dissipation, and automotive use cases |
Compared with SMBJ85CA and SMAJ85CA, the SMBG85CAHE3/5B delivers tighter clamping, AEC-Q101 validation, and superior thermal resistance - making it the preferred choice for space-constrained, high-reliability automotive and industrial designs where surge margin and long-term stability are critical.
Availability
SMBG85CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for SMBG85CAHE3/5B 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, efficiency, and application-specific optimization.
The SMBG series is engineered for high-power transient suppression in demanding environments - targeting automotive, industrial, and telecom applications where compact size, AEC-Q101 compliance, and repeatable clamping performance are essential.
FAQ
What is the clamping voltage of SMBG85CAHE3/5B at its rated peak pulse current?
The SMBG85CAHE3/5B has a maximum clamping voltage (VC) of 137 V at 4.4 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBG85CAHE3/5B maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMBG85CAHE3/5B suitable for automotive applications?
Yes, SMBG85CAHE3/5B is AEC-Q101 qualified and specifically designed for automotive use. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility, and validated performance under temperature cycling, humidity bias, and mechanical shock tests. The SMBG85CAHE3/5B is commonly deployed in engine control units, body control modules, and ADAS sensor interfaces where ISO 7637-2 and ISO 16750-2 compliance is required.
Does SMBG85CAHE3/5B have polarity markings on the package?
No, SMBG85CAHE3/5B does not feature polarity markings because it is a bidirectional TVS diode. Unlike unidirectional variants (e.g., SMBG85A), which use a cathode band, the SMBG85CAHE3/5B exhibits symmetric electrical behavior in both directions and requires no orientation during PCB placement. This simplifies layout and eliminates risk of reverse installation.
What is the thermal resistance of SMBG85CAHE3/5B from junction to ambient?
The SMBG85CAHE3/5B 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. Its junction-to-lead resistance (RθJL) is 20 °C/W. These values enable effective heat dissipation during repetitive surge events and support continuous operation at TJ up to +150 °C - critical for under-hood automotive deployments.
How does SMBG85CAHE3/5B differ from SMBG85A?
The SMBG85CAHE3/5B is bidirectional, while SMBG85A is unidirectional. This means SMBG85CAHE3/5B clamps transients of either polarity identically, whereas SMBG85A only protects against reverse-polarity surges and conducts forward current up to 100 A (IFSM). The SMBG85CAHE3/5B omits the cathode band marking and lacks IFSM rating. Both share identical VWM, VBR, VC, and PPPM specs, but differ fundamentally in circuit role and layout integration.
SMBG85CAHE3/5B 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:
- -
- Bidirectional Channels:
- 1
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG85CAHE3/5B FAQ
1.How can I place an order for SMBG85CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG85CAHE3/5B 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 SMBG85CAHE3/5B reliable?
The price and inventory of SMBG85CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG85CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBG85CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG85CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG85CAHE3/5B?
SMBG85CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG85CAHE3/5B 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 SMBG85CAHE3/5B?
For technical support, including SMBG85CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG85CAHE3/5B requirements.
6.How does Aetrix verify that SMBG85CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG85CAHE3/5B 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 SMBG85CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBG85CAHE3/5B?
All SMBG85CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG85CAHE3/5B, 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 SMBG85CAHE3/5B part is unused and in its original packaging.
Return procedure for SMBG85CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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