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Vishay General Semiconductor - Diodes Division SMBJ20CA-M3/5B
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- Part No.:
- SMBJ20CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CA-M3/5B.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,268
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Product details
Overview
SMBJ20CA-M3/5B from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features a 20 V stand-off voltage (VWM), 32.4 V maximum clamping voltage (VC) at 18.5 A peak pulse current (IPPM), and 600 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ20CA-M3/5B datasheet, SMBJ20CA-M3/5B pinout, SMBJ20CA-M3/5B application, or SMBJ20CA-M3/5B equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.62), MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and compatibility with automated SMT placement on PCBs with 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative transients without polarity dependency. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports consistent clamping under repetitive surge events.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its 0.094 %/°C temperature coefficient of VBR ensures predictable voltage drift across operating temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 24 V nominal systems. |
| VBR min / max | 22.2 V / 24.5 V at 1.0 mA - Verified breakdown threshold range ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamped voltage under 10/1000 µs surge; limits downstream IC stress to safe levels in 24 V bus protection. |
| PPPM | 600 W - Peak transient energy handling capacity; sustains single surges per IEC 61000-4-5 Level 4 (4 kV) test conditions. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| TJ max | +150 °C - Enables operation in under-hood automotive or industrial enclosures without derating below full power. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.21 mm × 4.06 mm footprint and 2.20 mm height; compatible with JEDEC MS-012. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | Either terminal serves as anode or cathode depending on transient polarity; no DC bias dependency required. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 surge events up to 4 kV without degradation under specified duty cycle (0.01 %). |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or damage to 3.3 V/5 V logic interfaces downstream. |
| MSL Level 1 (J-STD-020) | Allows unlimited floor life and reflow at 260 °C peak without baking - simplifies manufacturing and eliminates pre-bake logistics. |
| Halogen-free & RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for industrial and consumer electronics sold in EU, China, and other regulated markets. |
| Glass-passivated junction | Provides stable, repeatable breakdown characteristics and long-term reliability under thermal cycling and humidity exposure. |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting RS-485 transceivers and analog sensor outputs (e.g., 4–20 mA loops) from ESD and inductive switching transients in factory automation cabinets. IC Role / Device Role: Bidirectional clamping element placed across differential signal pairs or between signal and ground. Use Value: Limits transient voltage to ≤32.4 V, preventing damage to ±12 V tolerant transceivers and preserving signal fidelity during 2 kV contact ESD events. |
Use Scenario: Shielding Ethernet PHY front-end circuitry (e.g., RJ45 magnetics secondary side) from lightning-induced surges in outdoor access points. IC Role / Device Role: Secondary-stage TVS mounted adjacent to connector, shunting common-mode surges to chassis ground. Use Value: Absorbs 600 W surge energy while maintaining <1.0 µA leakage, avoiding false triggering or baseline shift in 100BASE-TX signaling. |
| Automotive Body Control Module | Power Supply Input Stage |
|
Use Scenario: Safeguarding LIN bus nodes and switch inputs in door modules exposed to load dump and jump-start transients. IC Role / Device Role: Bidirectional suppressor across LIN bus lines (VBAT and LIN) to clamp both positive and negative spikes. Use Value: Withstands 150 °C ambient and clamps 20 V nominal bus transients to 32.4 V, ensuring ASIL-B functional safety compliance for non-safety-critical nodes. |
Use Scenario: Front-end protection for 24 V DC-DC converters in industrial PLC power supplies subjected to ISO 7637-2 pulse 1/2a/5a. IC Role / Device Role: Parallel-connected TVS across input capacitor to clamp fast-rising transients before they reach switching regulator IC. Use Value: Delivers 18.5 A peak surge current handling with 32.4 V clamping, preventing overvoltage shutdown or MOSFET avalanche failure in buck controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA-E3/5B | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3 suffix). | Preferred for commercial-grade applications where halogen content is unrestricted. | Select when cost optimization is prioritized and halogen-free certification is not mandated by end-customer requirements. |
| SAC20CA | Same VWM (20 V) and VC (32.4 V), but in smaller SOD-123FL package (lower PPPM = 400 W). | Suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD), not full IEC 61000-4-5 surge. | Choose for space-constrained designs where 400 W rating suffices and PCB real estate is critical. |
Compared with SMBJ20CA-E3/5B, the M3 version adds halogen-free compliance without performance trade-offs; versus SAC20CA, SMBJ20CA-M3/5B provides 50 % higher surge power handling and superior thermal dissipation via larger SMB package - critical for sustained industrial surge immunity.
Availability
SMBJ20CA-M3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and 24 V power supply input stages requiring stable component supply and long-term obsolescence management.
Supply support for SMBJ20CA-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, MOSFETs, and protection devices with emphasis on reliability and application-specific performance.
The SMBJ series delivers standardized, high-power TVS protection for industrial, automotive, and telecom systems - engineered to meet stringent surge immunity standards while supporting automated manufacturing and long-lifecycle deployments.
FAQ
What is the clamping voltage of SMBJ20CA-M3/5B under a 10/1000 µs surge?
The SMBJ20CA-M3/5B clamps to a maximum of 32.4 V when subjected to its rated 18.5 A peak pulse current (IPPM) using the standard 10/1000 µs waveform. This value is measured at the device terminals under defined test conditions (TA = 25 °C, mounted on 5.0 mm × 5.0 mm copper pads), and represents the upper limit of voltage seen by protected circuitry during surge events.
Is SMBJ20CA-M3/5B suitable for automotive applications?
SMBJ20CA-M3/5B is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes; the M3/5B variant is commercial-grade and not AEC-Q101 certified. However, its 150 °C TJ max, robust clamping performance, and halogen-free construction make it widely used in non-safety-critical automotive subsystems such as body control modules and infotainment power rails - provided system-level qualification is performed.
How does the bidirectional design of SMBJ20CA-M3/5B affect circuit layout?
The bidirectional nature of SMBJ20CA-M3/5B eliminates polarity concerns during placement: either terminal connects to line or ground without regard to DC bias direction. This simplifies PCB routing for AC-coupled or differential signal paths (e.g., RS-485, CAN FD) and avoids errors in high-volume assembly - unlike unidirectional TVS diodes that require strict cathode/anode orientation.
What is the maximum steady-state power dissipation of SMBJ20CA-M3/5B?
SMBJ20CA-M3/5B has a maximum steady-state power dissipation (PD) of 5.0 W at TA = 50 °C on an infinite heatsink. In practical PCB layouts with 0.2" × 0.2" copper pads per terminal, derating applies above 25 °C ambient; at 70 °C ambient, usable PD drops to approximately 3.5 W based on the thermal derating curve in Figure 2 of the datasheet.
Does SMBJ20CA-M3/5B require special handling during reflow soldering?
No special handling is required: SMBJ20CA-M3/5B meets MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C. It can be placed directly into standard lead-free reflow profiles without baking or dry-packaging - significantly reducing manufacturing overhead compared to MSL Level 3+ components.
SMBJ20CA-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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 18.5A
- 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)
SMBJ20CA-M3/5B FAQ
1.How can I place an order for SMBJ20CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CA-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 SMBJ20CA-M3/5B reliable?
The price and inventory of SMBJ20CA-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 SMBJ20CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ20CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CA-M3/5B?
SMBJ20CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CA-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 SMBJ20CA-M3/5B?
For technical support, including SMBJ20CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ20CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ20CA-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 SMBJ20CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ20CA-M3/5B?
All SMBJ20CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CA-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 SMBJ20CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ20CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CA-M3/5B Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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Diodes Incorporated
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