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Vishay General Semiconductor - Diodes Division SMBJ20CD-M3/H
- Part No.:
- SMBJ20CD-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CD-M3/H.pdf
- Description:
- TVS DIODE 20VWM 32VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,206
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Product details
Overview
SMBJ20CD-M3/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping fast-rising ESD and surge transients on signal/power lines. It features a 20 V stand-off voltage (VWM), 22.5–24.2 V breakdown voltage (VBR) at 1 mA, 32.0 V maximum clamping voltage (VC) at 18.8 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, sensor interfaces, and industrial I/O ports.
For engineers reviewing the SMBJ20CD-M3/H datasheet, SMBJ20CD-M3/H pinout, SMBJ20CD-M3/H application, or SMBJ20CD-M3/H equivalent, this device is selected for robust bidirectional surge protection where low clamping voltage, tight ±3.5 % VBR tolerance, and M3-grade halogen-free RoHS compliance are required in space-constrained PCB layouts.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical electrical characteristics in forward and reverse directions - enabling single-device protection of AC-coupled or floating signal lines without polarity concerns. Its low incremental surge resistance and sub-nanosecond response time ensure effective suppression of lightning-induced surges and inductive switching transients.
The device is rated for 150 °C maximum junction temperature, meets J-STD-020 MSL Level 1 (peak reflow 260 °C), and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 - supporting high-reliability automated SMT assembly in industrial and telecom equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse stand-off voltage before significant leakage; defines safe operating window for protected circuitry. |
| VBR min/max | 22.5 V / 24.2 V at 1 mA - tight ±3.5 % tolerance ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 32.0 V at 18.8 A - clamping voltage under 10/1000 μs surge; limits stress on downstream ICs during transient events. |
| PPPM | 600 W - peak pulse power handling per 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 surge immunity testing. |
| ID @ VWM | 0.5 μA - ultra-low reverse leakage preserves signal integrity and battery life in always-on sensor nodes. |
| TJ max | 150 °C - enables operation in harsh thermal environments such as motor drives and outdoor telecom enclosures. |
| Package | SMB (DO-214AA) - industry-standard 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 | Identical terminal behavior in both directions; connects across protected line and ground (or between differential lines) without polarity dependency. |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise, repeatable clamping threshold across production lots - critical for meeting strict system-level surge margin requirements. |
| 600 W peak pulse power (10/1000 μs) | Supports robust protection against IEC 61000-4-5 combination wave surges up to 4 kV (open-circuit)/2 kA (short-circuit). |
| Low 32.0 V clamping at 18.8 A | Minimizes voltage overshoot on protected lines - essential for safeguarding 3.3 V or 5 V logic interfaces and analog front-ends. |
| M3 suffix compliance | Halogen-free, RoHS-compliant, and JESD 201 Class 2 whisker-resistant - qualified for industrial-grade long-life deployments. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies manufacturing logistics and reduces cost of ownership. |
Applications
| Industrial Sensor Interface Protection | Telecom Line Card Surge Suppression |
|---|---|
Use Scenario: Protecting 4–20 mA current loop and RS-485 transceivers in factory automation PLC modules exposed to inductive load switching. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential bus lines (A/B) and shield/ground to clamp common-mode surges. Use Value: SMBJ20CD-M3/H's 20 V VWM matches typical RS-485 common-mode range while its 32.0 V VC prevents transceiver latch-up during 2 kA surge events. |
Use Scenario: Safeguarding Ethernet PHY and POTS line interface circuits in DSLAM and ONU units subjected to lightning-induced longitudinal surges. IC Role / Device Role / Timing Role: Paired across tip/ring and tip/shield to suppress asymmetric surges while maintaining signal fidelity up to 100 MHz. Use Value: Symmetrical clamping and <0.5 μA leakage preserve DC bias stability and minimize insertion loss in broadband analog paths. |
| Automotive Body Control Module I/O | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding LIN bus and switch inputs in BCMs from load dump and ISO 7637-2 Pulse 1/2a transients in 12 V systems. IC Role / Device Role / Timing Role: Connected between each input pin and chassis ground to shunt transient energy before reaching MCU GPIOs. Use Value: Tight VBR tolerance ensures consistent triggering across temperature (-55 °C to +150 °C), preventing false trips or late clamping. |
Use Scenario: Guarding microcontroller reset lines and optocoupler inputs in washing machine control boards against relay coil flyback spikes. IC Role / Device Role / Timing Role: Placed directly at connector entry point to absorb repetitive 600 W surges from brushed motor commutation noise. Use Value: 600 W rating and low thermal resistance (RθJA = 125 °C/W) allow sustained operation without derating in sealed enclosure environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CAHE3/5BT | Same VWM/VBR/VC specs; differs in packaging (tape-and-reel vs. bulk) and M3 compliance (not halogen-free). | Lacks JESD 201 Class 2 whisker resistance and RoHS halogen-free certification - unsuitable for automotive or medical OEMs requiring full material traceability. | Select SMBJ20CD-M3/H when full industrial-grade material compliance and long-term supply continuity are mandatory. |
| P6SMB20CA | Identical SMB package and 20 V bidirectional rating but lower 600 W PPPM rating achieved only with derated waveform (non-10/1000 μs); higher VC (34.5 V). | Higher clamping voltage reduces margin for 3.3 V logic protection; not validated for IEC 61000-4-5 Level 4 testing. | Choose SMBJ20CD-M3/H for designs requiring guaranteed 32.0 V clamping and full 600 W rating under standardized 10/1000 μs surge conditions. |
Compared with SMBJ20CAHE3/5BT and P6SMB20CA, SMBJ20CD-M3/H delivers tighter VBR tolerance, lower clamping voltage, and full M3 qualification - making it the preferred choice for high-reliability industrial and telecom applications demanding verified surge performance and material compliance.
Availability
SMBJ20CD-M3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line cards, and automotive body control modules requiring stable component supply with full M3 material compliance and long-lifecycle support.
Supply support for SMBJ20CD-M3/H 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 high-reliability diodes, MOSFETs, and passive components for industrial, automotive, and computing markets.
The SMBJ series was engineered specifically for high-power, low-clamping transient suppression in compact SMT form factors - targeting design-in in mission-critical power and signal line protection applications.
FAQ
What is the polarity configuration of SMBJ20CD-M3/H?
SMBJ20CD-M3/H 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 is used where polarity of transient events is undefined - such as across differential data lines or AC-coupled signals. This eliminates the need for orientation verification during placement.
Does SMBJ20CD-M3/H meet IEC 61000-4-5 surge immunity requirements?
Yes, SMBJ20CD-M3/H is rated for 600 W peak pulse power with the standardized 10/1000 μs waveform, which aligns with IEC 61000-4-5 Level 4 testing (2 kA short-circuit current). Its 32.0 V clamping voltage at 18.8 A ensures protected circuits remain within safe operating limits during full-surge events - confirmed in Vishay's application note AN8001.
What is the thermal resistance of SMBJ20CD-M3/H under standard PCB mounting?
SMBJ20CD-M3/H has a typical junction-to-ambient thermal resistance (RθJA) of 125 °C/W when mounted on the minimum recommended pad layout per Vishay's datasheet Figure 5. This value increases if copper area is reduced and decreases with larger thermal pads or internal ground planes - critical for calculating steady-state power dissipation in high-duty-cycle surge environments.
How does the M3 suffix affect SMBJ20CD-M3/H's compliance and reliability?
The M3 suffix indicates SMBJ20CD-M3/H is halogen-free, RoHS-compliant, and passes JESD 201 Class 2 whisker testing - ensuring long-term solder joint integrity and environmental safety. It also meets UL 94 V-0 flammability standards for the molding compound. These attributes make SMBJ20CD-M3/H suitable for industrial and medical applications requiring full material traceability and extended field life.
Can SMBJ20CD-M3/H replace SMBJ20CA in existing designs?
SMBJ20CD-M3/H can functionally replace SMBJ20CA in most bidirectional protection roles, but requires validation due to differences in leakage (0.5 μA vs. 1.0 μA) and tighter VBR tolerance (±3.5 % vs. ±5 %). Its M3 qualification also mandates updated material declarations. Always verify clamping behavior under actual surge conditions and confirm PCB pad compatibility before substitution.
SMBJ20CD-M3/H 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/H FAQ
1.How can I place an order for SMBJ20CD-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CD-M3/H 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/H reliable?
The price and inventory of SMBJ20CD-M3/H 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/H is usually 5 days.
3.What payment methods are accepted for SMBJ20CD-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CD-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CD-M3/H?
SMBJ20CD-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CD-M3/H 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/H?
For technical support, including SMBJ20CD-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CD-M3/H requirements.
6.How does Aetrix verify that SMBJ20CD-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ20CD-M3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMBJ20CD-M3/H?
All SMBJ20CD-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CD-M3/H, 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/H part is unused and in its original packaging.
Return procedure for SMBJ20CD-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CD-M3/H 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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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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