🔎 Overview
When helping customers choose alternatives, they often ask:
- "Our original supplier has a long lead time—do you have alternatives?"
- "Can you offer maximum support in terms of price and lead time for mass production?"
- "If we use Semiware's alternatives, will the PCB need to be changed?"
This article uses the SMBJ18CA as an example to discuss the substitutability of Semiware's TVS diodes.
What's the SMBJ18CA?
The SMBJ18CA is a bidirectional transient voltage suppressor (TVS) diode widely used in industrial electronics, automotive subsystems, and power management circuits due to its standardized electrical parameters and SMB package.
🔋 SMBJ18CA Key Specifications
| Parameter | Value |
| Reverse Standoff Voltage (VRWM) | 18V |
| Breakdown Voltage (VBR) | 20V-22.1V |
| Clamping Voltage (VC) | 29.2V |
| Peak Pulse Power (10/1000 μs) | 600W |
| Package | SMB / DO-214AA |
| Polarity | Bidirectional |
| Operating Temperature | -55°C to +150°C |
| Brand | Semiware |
In Which Circuit Designs Does the SMBJ18CA Typically Appear?
The SMBJ18CA is commonly used for power lines, primarily in:
- 18V–24V DC input rails
- Industrial control boards
- Communication equipment
- Adapter-powered electronic devices
Common Selection Issues for SMB TVS Diode
1️⃣ Focusing only on voltage, ignoring clamping voltage
Problem: Excessive clamping voltage damages the downstream IC.
Checkpoint: Ensure clamping voltage < the maximum withstand voltage of the protected device (usually leave a 20% margin).
2️⃣ Package
Problem: Replacing SMB with SMA results in insufficient continuous power dissipation, causing the TVS to fail after multiple surges.
Key: SMB packages have lower thermal resistance, making them suitable for higher energy surge applications.
3️⃣ Ignoring bidirectional/unidirectional difference
Problem: Incorrectly using a unidirectional TVS on AC signal lines causes signal distortion.
Remember: SMBJ18CA (bidirectional) is for power/differential signals; SMBJ18A (unidirectional) is for the positive terminal of DC power supply.
Our Supply Advantages
- Inventory: SMBJ18CA and equivalent models are usually in stock.
- Technical Support: Free surge testing solution evaluation provided.
- Flexible Supply: MOQ supported, mixed models accepted.
- Quality Assurance: Test reports provided for all models.
❓ Frequently Asked Questions (FAQs)
Q: Can you provide actual surge test data for the SMBJ18CA equivalent?
Yes, we can provide actual surge test data for the SMBJ18CA equivalent, including detailed performance test reports and data, for customer reference and verification.
Q: What is the minimum order quantity (MOQ)? Do you support free sample requests?
We support free samples and small-batch testing requests.
Q: How many days can the lead time be reduced for urgent needs?
Our standard lead time is 2-4 weeks, but for urgent needs, we can provide expedited production and shipping services. Please contact our account manager for details.
Q: What are your bulk pricing tiers?
We offer flexible pricing tiers for bulk purchasing customers. Prices will be adjusted according to the order quantity. We will provide a customized quote based on your specific needs.
Instant Verification:
If you are evaluating alternatives, feel free to request our free samples first.
↗️ https://en.semiware.com/contact/ .Compare product performance through actual testing to ensure it meets your needs.
Technical Consultation:
If you have specific application circuit requirements, please send us your circuit design, and we will provide you with a customized protection solution.
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