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Vishay General Semiconductor - Diodes Division SMBJ20CD-M3/I
- Part No.:
- SMBJ20CD-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CD-M3/I.pdf
- Description:
- TVS DIODE 20VWM 32VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,600
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Product details
Overview
SMBJ20CD-M3/I 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 and power lines. It features a 20 V stand-off voltage (VWM), 22.5–24.2 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), and clamps to ≤32.0 V at 18.8 A peak surge current - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ20CD-M3/I datasheet, SMBJ20CD-M3/I pinout, SMBJ20CD-M3/I application, or SMBJ20CD-M3/I equivalent, this page delivers verified electrical parameters, bidirectional polarity behavior, thermal derating curves, M3-grade halogen-free RoHS compliance, and direct alternative part comparisons for ESD/surge protection design-in.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (22.5–24.2 V), VWM (20 V), and clamping voltage (VC ≤ 32.0 V at IPPM = 18.8 A). Its low incremental surge resistance and fast response time enable effective suppression of EFT, lightning-induced surges, and inductive switching transients.
Thermal performance is defined by RθJA = 125 °C/W (on minimum pad) and RθJM = 20 °C/W, supporting operation from –55 °C to +150 °C junction temperature. The device meets MSL Level 1 per J-STD-020 and passes JESD 201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 22.5 V / 24.2 V at 1 mA - tight ±3.5 % tolerance ensures predictable turn-on across production lots |
| VC @ IPPM | ≤32.0 V at 18.8 A - clamping voltage limits downstream IC stress during 10/1000 μs surge events |
| PPPM | 600 W - peak pulse power handling capability under standardized 10/1000 μs waveform |
| ID @ VWM | ≤0.5 μA - ultra-low leakage preserves signal integrity in high-impedance sensor or data lines |
| TJ max | +150 °C - enables reliable operation in enclosed industrial enclosures without forced cooling |
| Package | SMB (DO-214AA) - 2-pin surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no cathode band marking; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Pin 1 & Pin 2) | Bidirectional surge path | Interchangeable terminals; voltage clamping occurs identically in either polarity direction |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise, repeatable clamping thresholds across manufacturing batches and temperature ranges |
| 600 W PPPM (10/1000 μs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-earth) in compact SMB layout |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT assembly without moisture sensitivity concerns |
| M3 suffix compliance | Halogens-free, RoHS-compliant, and qualified to JESD 201 Class 2 whisker resistance |
| Low ID ≤ 0.5 μA @ VWM | Minimizes standby power loss and avoids false triggering in battery-powered sensor nodes |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
Use Scenario: Protecting analog output (4–20 mA) and digital I/O lines of pressure/temperature sensors exposed to motor drive noise and relay switching transients. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transient energy before reaching ADC or microcontroller GPIO. Use Value: Limits induced voltage spikes to ≤32.0 V, preserving sensor signal fidelity and preventing latch-up in downstream ASICs. |
Use Scenario: Shielding RS-485/RS-232 data lines in base station backhaul units from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Primary surge suppression device mounted differential across A/B bus lines, leveraging bidirectional symmetry for AC-coupled signals. Use Value: Withstands 18.8 A peak current while maintaining <32 V clamping, ensuring communication link integrity during 10/1000 μs transients. |
| Consumer Power Adapter Input | Automotive Body Control Module |
Use Scenario: Secondary-side overvoltage protection on 12 V DC input rails of USB-C PD adapters subjected to load dump and hot-swap events. IC Role / Device Role / Timing Role: Fast-response TVS placed after primary filter stage to clamp residual transients escaping upstream MOVs. Use Value: 600 W rating and 32 V clamping prevent damage to synchronous rectifier controllers and secondary-side monitoring ICs. |
Use Scenario: CAN FD physical layer protection in door module ECUs where ESD and load dump pulses threaten transceiver ICs. IC Role / Device Role / Timing Role: Bidirectional TVS connected between CAN_H/CAN_L and chassis ground to suppress differential and common-mode surges. Use Value: Tight VBR tolerance (±3.5 %) ensures consistent clamping onset across temperature, critical for CAN bus signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA-E3/52 (Vishay) | Same VWM/VBR/PPPM specs; differs only in packaging (tape-and-reel vs. bulk) and M3 vs. standard M suffix | No functional difference; E3/52 denotes different reel size and tray packaging, not electrical variation | Select SMBJ20CD-M3/I when M3-grade whisker resistance and halogen-free compliance are required for high-reliability industrial use. |
| P6SMB20CA (ON Semiconductor) | Identical SMB package, 20 V VWM, 22.2–24.6 V VBR range, 600 W PPPM - but ±5 % VBR tolerance vs. ±3.5 % for SMBJ20CD-M3/I | Higher VBR spread may increase risk of premature conduction in precision 20 V rail designs | Choose SMBJ20CD-M3/I where tighter clamping consistency across temperature and lot is critical for sensor interface stability. |
Compared with SMBJ20CA-E3/52, SMBJ20CD-M3/I offers guaranteed M3 whisker resistance and halogen-free construction; versus P6SMB20CA, it delivers superior VBR tolerance control (±3.5 % vs. ±5 %), enabling more robust margining in 20 V system-level surge protection.
Availability
SMBJ20CD-M3/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, consumer power adapter inputs, and automotive body control modules requiring stable component supply and long-term lifecycle assurance.
Supply support for SMBJ20CD-M3/I 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 and ruggedness.
The SMBJ series was engineered specifically for high-energy transient suppression in space-constrained surface-mount applications, targeting industrial, telecom, and automotive systems demanding repeatable clamping and extended thermal endurance.
FAQ
What is the polarity configuration of SMBJ20CD-M3/I?
SMBJ20CD-M3/I is a bidirectional TVS diode, meaning it provides symmetrical clamping in both forward and reverse directions. Unlike unidirectional variants (e.g., SMBJ20D), it has no cathode band marking and functions identically regardless of voltage polarity applied across its terminals - essential for protecting AC-coupled or differential signal lines like RS-485 or CAN bus.
Does SMBJ20CD-M3/I meet RoHS and halogen-free requirements?
Yes, SMBJ20CD-M3/I carries the M3 suffix, confirming it is halogen-free, RoHS-compliant, and qualified to JESD 201 Class 2 for tin whisker resistance. This makes it suitable for high-reliability industrial and automotive applications where material compliance and long-term solder joint integrity are mandatory.
What is the maximum clamping voltage for SMBJ20CD-M3/I under surge conditions?
The maximum clamping voltage (VC) for SMBJ20CD-M3/I is 32.0 V at a peak pulse current (IPPM) of 18.8 A, measured using the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is critical for ensuring downstream ICs remain within absolute maximum ratings.
How does SMBJ20CD-M3/I differ from unidirectional SMBJ20D?
SMBJ20CD-M3/I is bidirectional with symmetrical VBR and VC characteristics in both polarities, while SMBJ20D is unidirectional and conducts only in reverse bias (cathode-banded). SMBJ20CD-M3/I is used where polarity reversal or AC signals exist; SMBJ20D suits DC power rail protection where polarity is fixed and lower leakage at zero bias is prioritized.
What PCB pad layout is recommended for optimal thermal performance of SMBJ20CD-M3/I?
Vishay specifies a minimum 5.0 mm × 5.0 mm copper pad area per terminal for SMBJ20CD-M3/I to achieve rated power dissipation. Using this layout reduces RθJA from 125 °C/W to 100 °C/W, allowing higher sustained surge duty cycles and improved reliability in thermally constrained environments such as sealed industrial enclosures.
SMBJ20CD-M3/I 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):
- 22.5V
- Voltage - Clamping (Max) @ Ipp:
- 32V
- Current - Peak Pulse (10/1000µs):
- 18.8A
- 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)
SMBJ20CD-M3/I FAQ
1.How can I place an order for SMBJ20CD-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CD-M3/I 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 SMBJ20CD-M3/I reliable?
The price and inventory of SMBJ20CD-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20CD-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ20CD-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CD-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CD-M3/I?
SMBJ20CD-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CD-M3/I 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 SMBJ20CD-M3/I?
For technical support, including SMBJ20CD-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CD-M3/I requirements.
6.How does Aetrix verify that SMBJ20CD-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ20CD-M3/I 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 SMBJ20CD-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ20CD-M3/I?
All SMBJ20CD-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CD-M3/I, 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 SMBJ20CD-M3/I part is unused and in its original packaging.
Return procedure for SMBJ20CD-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CD-M3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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