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Vishay General Semiconductor - Diodes Division SMBJ18CA-M3/5B
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- Part No.:
- SMBJ18CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CA-M3/5B.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,006
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Product details
Overview
SMBJ18CA-M3/5B from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features a 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤29.2 V at 20.5 A peak surge current - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ18CA-M3/5B datasheet, SMBJ18CA-M3/5B pinout, SMBJ18CA-M3/5B application, or SMBJ18CA-M3/5B equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, thermal resistance (RθJA = 100 °C/W), JEDEC-compliant MSL Level 1 handling, and halogen-free RoHS compliance per Vishay's M3 suffix.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, IPPM, and VC ratings in forward and reverse directions. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching transients.
The device is rated for TJ = –55 °C to +150 °C, derates linearly above 25 °C per Fig. 2, and achieves 20.5 A peak pulse current (IPPM) under 10/1000 µs waveform while maintaining low incremental surge resistance - critical for protecting downstream MOSFETs and ICs without latch-up risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | ≤29.2 V at 20.5 A - Clamped voltage under 600 W transient; limits stress on protected circuitry. |
| PPPM | 600 W (10/1000 µs) - Peak surge energy handling capacity; supports repetitive 0.01% duty cycle pulses. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage at standoff voltage; preserves signal integrity in high-impedance paths. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs board-level thermal design. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated placement and reflow. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals with matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (reverse bias) | Accepts surge current when voltage exceeds VBR in either direction; connects to line under protection. |
| Cathode | Transient current entry (forward bias) | Same physical terminal as Anode in bidirectional construction; enables symmetrical clamping on AC or floating lines. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout in AC or differential signal lines. |
| 600 W peak pulse power | Withstands 10/1000 µs transients up to 20.5 A - protects against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) on 24 V systems. |
| MSL Level 1 rating | Moisture sensitivity level compliant per J-STD-020 - allows unlimited floor life and standard reflow without baking. |
| Halogen-free & RoHS | M3 suffix confirms halogen-free molding compound and full RoHS compliance - meets IPC-1752A material declaration requirements. |
| Low clamping ratio | VC/VWM = 1.62 - tight voltage margin between standby and clamping ensures robust protection without overdesign. |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting analog output lines (4–20 mA) and digital I/O (RS-485) in PLC modules from field-induced surges. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across signal pair or signal-to-ground. Use Value: Limits transient voltage to ≤29.2 V, preventing damage to op-amps, isolators, and RS-485 transceivers rated for ±30 V common-mode. |
Use Scenario: Shielding Ethernet PHY interface and PoE data lines from lightning-induced surges in outdoor access points. IC Role / Device Role / Timing Role: Primary TVS on differential pairs (e.g., TX+/TX−) and common-mode lines. Use Value: Responds in <1 ns to suppress 10/1000 µs surges up to 600 W, preserving signal integrity and meeting IEC 61000-4-5 compliance. |
| Automotive Body Control Module | Consumer Power Adapter Input |
|
Use Scenario: Safeguarding LIN bus and switched 12 V supply rails in BCMs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Secondary clamping device downstream of primary fuses and inductors. Use Value: Withstands 20.5 A peak current at 29.2 V clamp, reducing stress on downstream TVS arrays and enabling smaller PCB area vs. unidirectional alternatives. |
Use Scenario: Input-stage surge suppression on AC-DC adapter primary side (rectified DC bus) before bulk capacitor. IC Role / Device Role / Timing Role: Fast-acting shunt protector triggered by line transients exceeding 18 V. Use Value: Halogen-free M3 construction supports eco-design standards; 100 °C/W RθJA enables thermal reliability in compact, sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA-E3/5B | RoHS-compliant but not halogen-free; same electrical specs and SMB package. | Preferred for commercial-grade designs where halogen content is unrestricted. | Select SMBJ18CA-E3/5B when cost optimization is prioritized and halogen-free requirement is absent. |
| SMAJ18CA-M3 | Lower 400 W PPPM; SMA (DO-214AC) package with smaller 4.5 mm × 2.7 mm footprint. | Suitable for space-constrained consumer electronics with lower surge exposure. | Choose SMAJ18CA-M3 only if system-level surge testing validates 400 W capability and PCB layout permits smaller pad geometry. |
Compared with SMBJ18CA-E3/5B, the SMBJ18CA-M3/5B adds halogen-free compliance without sacrificing performance; versus SMAJ18CA-M3, it delivers 50% higher surge power in a slightly larger but thermally superior SMB package - making it optimal for industrial and automotive front-end protection.
Availability
SMBJ18CA-M3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and consumer power adapter inputs requiring stable component supply across production lifecycles.
Supply support for SMBJ18CA-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, rectifiers, and protection devices with emphasis on reliability and application-specific validation.
The SMBJ series targets high-energy transient suppression in harsh environments - engineered for automotive (AEC-Q101 qualified variants), industrial automation, and telecom infrastructure where robustness and consistency are non-negotiable.
FAQ
What is the clamping voltage of SMBJ18CA-M3/5B at its rated peak pulse current?
The SMBJ18CA-M3/5B clamps to a maximum of 29.2 V at its rated peak pulse current of 20.5 A (10/1000 µs waveform). This value is measured under standardized test conditions with 0.2" × 0.2" copper pads and represents the upper limit of voltage seen by protected circuitry during a full-power transient event. The SMBJ18CA-M3/5B maintains this clamping performance bidirectionally, ensuring consistent protection regardless of surge polarity.
Is SMBJ18CA-M3/5B suitable for automotive applications?
The SMBJ18CA-M3/5B itself is commercial-grade (M3 suffix), not AEC-Q101 qualified. However, Vishay offers the functionally identical SMBJ18CA-HM3_B/I variant with AEC-Q101 qualification for automotive use. For non-safety-critical automotive subsystems like infotainment or lighting controls where qualification is not mandated, the SMBJ18CA-M3/5B may be used - but the SMBJ18CA-M3/5B must be validated per system-level requirements before deployment in vehicle platforms.
How does the M3 suffix differ from E3 in SMBJ18CA-M3/5B?
The M3 suffix in SMBJ18CA-M3/5B denotes halogen-free, RoHS-compliant construction, whereas E3 indicates RoHS-compliant but standard brominated flame-retardant molding compound. Electrically and mechanically, SMBJ18CA-M3/5B and SMBJ18CA-E3/5B are identical - same VWM, VBR, VC, package, and thermal characteristics. The SMBJ18CA-M3/5B meets IPC-1752A environmental reporting requirements and is preferred for green electronics initiatives.
What is the maximum operating temperature for SMBJ18CA-M3/5B?
The SMBJ18CA-M3/5B has a maximum junction temperature (TJ) of +150 °C and an operating ambient range of –55 °C to +150 °C. Derating begins above 25 °C per Figure 2 in the datasheet, with pulse power reduced linearly to zero at 150 °C. At 100 °C ambient, the SMBJ18CA-M3/5B retains ~50% of its 600 W peak pulse rating - a key consideration for thermally dense PCB layouts.
Does SMBJ18CA-M3/5B require a heatsink for standard operation?
No external heatsink is required for SMBJ18CA-M3/5B under typical transient conditions, as its RθJA of 100 °C/W is specified with minimum recommended 0.2" × 0.2" copper pads per terminal. Continuous power dissipation is limited to 5.0 W, but the device handles short-duration surges (≤50 ms) without thermal runaway. Layout best practices - including adequate copper pour and thermal vias - ensure the SMBJ18CA-M3/5B remains within safe operating limits during repetitive surge events.
SMBJ18CA-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ18CA-M3/5B FAQ
1.How can I place an order for SMBJ18CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CA-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 SMBJ18CA-M3/5B reliable?
The price and inventory of SMBJ18CA-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 SMBJ18CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ18CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CA-M3/5B?
SMBJ18CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CA-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 SMBJ18CA-M3/5B?
For technical support, including SMBJ18CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ18CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ18CA-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 SMBJ18CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ18CA-M3/5B?
All SMBJ18CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CA-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 SMBJ18CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ18CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CA-M3/5B Tags
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