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Vishay General Semiconductor - Diodes Division SMBG18A-M3/5B
- Part No.:
- SMBG18A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG18A-M3/5B.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,338
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Product details
Overview
SMBG18A-M3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, rated for 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR at 1.0 mA), and 600 W peak pulse power (10/1000 μs). It clamps transients to ≤29.2 V at 20.5 A peak surge current and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the SMBG18A-M3/5B datasheet, SMBG18A-M3/5B pinout, SMBG18A-M3/5B application, or SMBG18A-M3/5B equivalent, this page delivers verified electrical parameters, polarity marking, junction-to-lead thermal resistance (20 °C/W), MSL Level 1 compliance, and halogen-free RoHS industrial-grade construction - all critical for ESD/surge protection design-in and automotive BOM validation.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, optimized for fast response (<1 ns) to voltage transients induced by inductive load switching or lightning surges. Its glass-passivated junction ensures stable leakage performance (≤1.0 μA at 18 V) and low incremental surge resistance.
Designed for surface-mount automated placement, it delivers 600 W peak pulse power handling per 10/1000 μs waveform at TA = 25 °C, with derating above 25 °C per Fig. 2 and junction temperature limits of –55 °C to +150 °C. Thermal resistance from junction to lead is 20 °C/W, enabling effective heat dissipation on standard PCB copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line bias margin. |
| VBR (min/max) | 20.0 V / 22.1 V at 1.0 mA - Confirmed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamped voltage under full 600 W surge; determines protected IC's maximum stress level. |
| IPPM | 20.5 A - Peak pulse current supported with 10/1000 μs waveform; defines transient energy absorption capacity. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance; supports thermal design using PCB copper pad heatsinking. |
| MSL Level | Level 1 (per J-STD-020) - No floor life limitation; allows indefinite dry pack storage and standard reflow without baking. |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount gull-wing, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity marked with cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-potential node; completes clamping path during positive transients. |
| Cathode | High-side surge input terminal | Marked with band; connects to protected line (e.g., 12 V rail or sensor signal); conducts during reverse overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for engine control, ADAS, and body electronics. |
| 600 W peak pulse power | Withstands high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without degradation when mounted on 5.0 mm × 5.0 mm copper pads. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1.0 μA) across temperature and lifetime - critical for low-power sensor interfaces. |
| Low profile SMBG package | Height ≤0.030" (0.76 mm); enables compact layout in space-constrained modules like ECUs and infotainment head units. |
| Halogen-free & RoHS compliant (M3 suffix) | Meets automotive environmental standards (e.g., ELV, IMDS); eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in engine control units against load dump and alternator ripple transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and DC/DC input, conducting only during negative-going surges relative to ground. Use Value: Limits voltage to ≤29.2 V during 20.5 A transients, preventing damage to downstream PMICs and microcontrollers rated for 30 V absolute maximum. | Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA current loops) in PLC I/O modules exposed to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SMBG18A-M3/5B serves as unidirectional clamp on supply-referenced signal paths where polarity is fixed. Use Value: Sub-1 ns response time and 1.0 μA leakage at 18 V preserve signal integrity and minimize offset error in precision current-sense circuits. |
| Consumer Power Adapter Input Protection | Telecom Line Card Surge Suppression |
Use Scenario: Front-end protection for AC/DC adapters handling universal input (90–264 VAC), guarding against differential-mode surges entering via primary-side rectifier. IC Role / Device Role / Timing Role: Placed across bulk capacitor terminals to clamp fast-rising spikes from switching noise or lightning-induced coupling. Use Value: 600 W rating and 20 °C/W RθJL allow repeated surge absorption without thermal runaway when paired with adequate PCB copper area. | Use Scenario: Secondary-side protection on Ethernet PHY power rails (e.g., 3.3 V or 5 V) in network switches subjected to IEC 61000-4-5 line surge tests. IC Role / Device Role / Timing Role: Unidirectional TVS connected between VDD and GND to shunt common-mode surges coupled onto low-voltage logic rails. Use Value: AEC-Q101 qualification and MSL Level 1 ensure robustness in high-volume telecom manufacturing and long-term field deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBG18A-E3/5B | Same electrical specs and SMBG package; RoHS-compliant but not halogen-free (E3 vs. M3). | Approved for industrial use but lacks halogen-free certification required by some automotive OEMs. | Select SMBG18A-E3/5B only if halogen-free material is not mandated; otherwise prefer SMBG18A-M3/5B. |
| SMBJ18A-M3/5B | Same VWM (18 V), VBR, and VC, but in larger SMB (DO-214AA) package with higher IFSM (40 A vs. 100 A) and lower RθJA (85 °C/W vs. 100 °C/W). | Better thermal performance and surge robustness, but requires larger PCB footprint and different pad layout. | Choose SMBJ18A-M3/5B when higher single-pulse surge margin or improved thermal management is needed; SMBG18A-M3/5B suits space-constrained designs. |
Compared with SMBG18A-E3/5B, the M3 suffix adds halogen-free compliance essential for automotive Tier 1 sourcing; versus SMBJ18A-M3/5B, the SMBG package saves >30 % board area while maintaining identical clamping performance and AEC-Q101 qualification.
Availability
SMBG18A-M3/5B is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and telecom line card surge suppression requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMBG18A-M3/5B 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMBG series is part of Vishay's TRANSZORB® TVS platform, engineered for high-energy transient suppression in automotive, industrial, and communications systems where compact size, fast response, and AEC-Q101 qualification are mandatory.
FAQ
What is the breakdown voltage range for SMBG18A-M3/5B?
The SMBG18A-M3/5B has a guaranteed breakdown voltage (VBR) range of 20.0 V to 22.1 V at a test current of 1.0 mA, measured per ANSI/IEEE C62.35. This range ensures consistent clamping behavior across production lots and supports reliable overvoltage protection design margins for 18 V nominal systems.
Is SMBG18A-M3/5B suitable for automotive applications?
Yes, SMBG18A-M3/5B is AEC-Q101 qualified and rated for junction temperatures from –55 °C to +150 °C. Its halogen-free (M3) construction, MSL Level 1 rating, and 600 W surge capability make it suitable for engine control units, body electronics, and ADAS modules where automotive-grade reliability is required.
What does the "M3" suffix indicate in SMBG18A-M3/5B?
The "M3" suffix in SMBG18A-M3/5B denotes halogen-free, RoHS-compliant, industrial-grade construction per Vishay's ordering nomenclature. It specifies matte tin-plated leads, JESD 201 Class 2 whisker resistance, and compliance with UL 94 V-0 flammability - distinct from E3 (RoHS only) and HM3 (AEC-Q101 + halogen-free) variants.
How is polarity identified on SMBG18A-M3/5B?
SMBG18A-M3/5B uses a cathode band marking on the package body to identify the cathode terminal. As a unidirectional TVS, the banded end connects to the protected line (e.g., 12 V rail), while the opposite end (anode) connects to ground - ensuring correct orientation for clamping positive transients relative to ground.
What is the peak pulse current rating for SMBG18A-M3/5B?
The SMBG18A-M3/5B is rated for a peak pulse current (IPPM) of 20.5 A under the standard 10/1000 μs double-exponential waveform. This value corresponds directly to its 600 W peak pulse power rating and is validated with 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per JEDEC test conditions.
SMBG18A-M3/5B 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 20.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG18A-M3/5B FAQ
1.How can I place an order for SMBG18A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG18A-M3/5B 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 SMBG18A-M3/5B reliable?
The price and inventory of SMBG18A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG18A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBG18A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG18A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG18A-M3/5B?
SMBG18A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG18A-M3/5B 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 SMBG18A-M3/5B?
For technical support, including SMBG18A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG18A-M3/5B requirements.
6.How does Aetrix verify that SMBG18A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG18A-M3/5B 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 SMBG18A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBG18A-M3/5B?
All SMBG18A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG18A-M3/5B, 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 SMBG18A-M3/5B part is unused and in its original packaging.
Return procedure for SMBG18A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG18A-M3/5B Tags
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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