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Vishay General Semiconductor - Diodes Division SMBJ18-E3/5B
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- Part No.:
- SMBJ18-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18-E3/5B.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,179
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Product details
Overview
SMBJ18-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 29.2 V maximum clamping voltage (VC) at 20.5 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMBJ18-E3/5B datasheet, SMBJ18-E3/5B pinout, SMBJ18-E3/5B application, or SMBJ18-E3/5B equivalent, this device is selected for robust overvoltage protection on DC power rails, MOSFET gate drivers, and sensor signal lines in industrial control, automotive subsystems, and telecom infrastructure where fast response (<1 ps), low clamping ratio, and AEC-Q101-compliant variants are critical.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, conducting only when reverse voltage exceeds VBR, with cathode-band polarity marking. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while its low incremental surge resistance enables tight clamping under high-current transients.
The device is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its thermal resistance (RθJA = 100 °C/W) assumes mounting on 0.2" × 0.2" copper pads - essential for sustaining repetitive 600 W pulses at 0.01% duty cycle without thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 24 V systems. |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - Confirmed breakdown range ensures reliable triggering above system noise but below IC absolute maximum ratings. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamping voltage limits transient energy delivered to downstream components during 10/1000 µs surge events. |
| PPPM | 600 W - Peak pulse power handling capacity with standardized 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 compliance when properly laid out. |
| IPPM | 20.5 A - Peak surge current capability derived from VC and PPPM; validates protection for typical 1 Ω source impedance transients. |
| TJ max | +150 °C - Enables operation in under-hood automotive or industrial environments without derating below ambient 125 °C. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated. Cathode identified by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential node in unidirectional configuration; conducts during positive transients relative to cathode. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V rail); avalanche breakdown occurs here when voltage exceeds VBR, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-event suppression of high-energy transients common in motor drives and relay coils without thermal failure. |
| 29.2 V clamping voltage at 20.5 A | Provides <2.5× VWM clamping ratio - tighter than typical 3× - reducing stress on downstream 30 V-rated MOSFETs or regulators. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage across temperature and life cycles; eliminates risk of metallization migration under surge stress. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free assembly without pre-baking; eliminates moisture-related popcorning during PCB manufacturing. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental regulations without halogen content restrictions; suitable for non-automotive industrial and consumer applications. |
Applications
| Industrial Motor Control | Automotive Body Electronics |
|---|---|
|
Use Scenario: Protection of H-bridge gate drivers and current-sense amplifiers against back-EMF spikes from brushed DC motors. IC Role / Device Role / Timing Role: Unidirectional TVS placed between high-side gate and ground, clamping negative flyback transients within nanoseconds. Use Value: Prevents latch-up or oxide breakdown in 20 V-rated gate drivers by limiting transient voltage to ≤29.2 V during 20.5 A inductive kick. |
Use Scenario: Surge protection on LIN bus lines and door module power inputs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-clamp element on 12 V supply rail, absorbing ISO 7637-2 Pulse 1/2a/5a energy without affecting normal operation. Use Value: Maintains system uptime by surviving repeated 100 V/50 ms transients without degradation, validated per AEC-Q101 when using HE3 variant. |
| Telecom Power Supply | Consumer Sensor Interface |
|
Use Scenario: Input-stage protection for 24 V PoE-powered base stations and remote radio units subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on DC input before DC/DC converter, coordinated with upstream GDT or MOV for staged protection. Use Value: Limits let-through voltage to <30 V during 6 kV/3 kA IEC 61000-4-5 combination wave testing, preserving 36 V input-rated converters. |
Use Scenario: ESD and surge hardening of analog outputs from MEMS accelerometers and temperature sensors in smart home hubs. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) unidirectional clamp on 3.3 V or 5 V analog output lines, referenced to local ground. Use Value: Suppresses >8 kV HBM ESD events while adding <0.5 pF parasitic capacitance - negligible impact on 100 kHz sensor bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-E3/5B | Same electrical specs and package; identical marking code "LT" and VBR range (20.0–22.1 V). No functional difference. | No distinction in use case - both intended for commercial-grade unidirectional TVS applications. | Select SMBJ18A-E3/5B if cross-referencing legacy designators; SMBJ18-E3/5B is the current preferred part number per Vishay ordering matrix. |
| SMBJ18CA-E3/5B | Bidirectional variant: symmetric VBR (20.0–22.1 V) in both directions; no polarity marking; higher ID leakage at low VWM. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where bidirectional clamping is mandatory. | Choose SMBJ18CA-E3/5B only when protecting balanced differential pairs or ungrounded circuits; not a drop-in replacement for SMBJ18-E3/5B. |
Compared with SMBJ18A-E3/5B (identical specification) and SMBJ18CA-E3/5B (bidirectional), SMBJ18-E3/5B provides optimized unidirectional clamping for grounded DC rails - delivering lower leakage, tighter VC/VBR ratio, and simpler layout versus bidirectional alternatives.
Availability
SMBJ18-E3/5B is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and telecom power supply designs requiring stable component supply, RoHS-compliant packaging, and proven surge immunity.
Supply support for SMBJ18-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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive qualification.
The SMBJ series was developed for high-power, surface-mount transient suppression in space-constrained applications - targeting industrial automation, automotive subsystems, and communications infrastructure where robustness and repeatability are non-negotiable.
FAQ
What is the breakdown voltage range for SMBJ18-E3/5B?
The SMBJ18-E3/5B has a guaranteed breakdown voltage (VBR) range of 20.0 V to 22.1 V at 1 mA test current, measured per ANSI/IEEE C62.35. This range ensures consistent clamping behavior across production lots and supports design margining for 24 V nominal systems where transient headroom must exceed 20 V.
Is SMBJ18-E3/5B suitable for automotive applications?
SMBJ18-E3/5B is RoHS-compliant and qualified to commercial temperature grade (−55 °C to +150 °C), but it is not AEC-Q101 qualified. For automotive use, specify SMBJ18HE3-B/I (AEC-Q101 qualified, halogen-free) instead. The SMBJ18-E3/5B remains appropriate for non-safety-critical industrial or consumer applications requiring the same electrical performance.
What does the "E3/5B" suffix indicate in SMBJ18-E3/5B?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads; "5B" specifies packaging in 13-inch diameter tape-and-reel format containing 3200 units. This matches Vishay's standard ordering code structure and ensures compatibility with high-speed SMT assembly lines using 13" feeders.
How does SMBJ18-E3/5B compare to SMAJ18A in terms of power handling?
SMBJ18-E3/5B delivers 600 W peak pulse power (10/1000 µs), whereas SMAJ18A is rated for 400 W. The larger SMB package provides lower thermal resistance (RθJA = 100 °C/W vs. ~130 °C/W for SMA), enabling higher surge repetition rates and improved reliability in thermally demanding layouts - critical for motor drive and power supply applications.
Can SMBJ18-E3/5B be used in bidirectional signal protection?
No - SMBJ18-E3/5B is unidirectional and features a cathode band marking; it conducts only in reverse bias. For bidirectional protection (e.g., on AC lines or differential buses), use SMBJ18CA-E3/5B, which has symmetrical breakdown in both directions and no polarity marking. Substituting SMBJ18-E3/5B in bidirectional roles risks catastrophic failure during positive half-cycles.
SMBJ18-E3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 18.6A
- 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 (SMBJ)
SMBJ18-E3/5B FAQ
1.How can I place an order for SMBJ18-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18-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 SMBJ18-E3/5B reliable?
The price and inventory of SMBJ18-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 SMBJ18-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ18-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18-E3/5B?
SMBJ18-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18-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 SMBJ18-E3/5B?
For technical support, including SMBJ18-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18-E3/5B requirements.
6.How does Aetrix verify that SMBJ18-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ18-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 SMBJ18-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ18-E3/5B?
All SMBJ18-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18-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 SMBJ18-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ18-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18-E3/5B Tags
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