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Vishay General Semiconductor - Diodes Division SMBJ20A-M3/52
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- Part No.:
- SMBJ20A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20A-M3/52.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,248
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Product details
Overview
SMBJ20A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 32.4 V maximum clamping voltage (VC) at 18.5 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in industrial motor drives.
For engineers reviewing the SMBJ20A-M3/52 datasheet, SMBJ20A-M3/52 pinout, SMBJ20A-M3/52 application, or SMBJ20A-M3/52 equivalent, key selection criteria include clamping performance under 18.5 A surge, thermal resistance (RθJA = 100 °C/W), halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, activated when reverse voltage exceeds its VBR threshold. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at 20 V), while the low incremental surge resistance enables rapid energy diversion during transients induced by inductive switching or ESD events.
The device is rated for repetitive 600 W pulses (10/1000 µs, 0.01% duty cycle) and withstands 100 A non-repetitive forward surge (8.3 ms half-sine). Junction temperature range spans −55 °C to +150 °C, and it meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - Confirmed breakdown window ensures reliable turn-on without premature conduction. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamping voltage limits downstream IC stress during worst-case 600 W transient events. |
| PPPM | 600 W - Peak pulse power handling capability with standardized 10/1000 µs waveform; validated for industrial surge immunity. |
| IPPM | 18.5 A - Peak pulse current supported at VC; determines minimum trace width and PCB pad design for surge path. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient; requires ≥5.0 mm × 5.0 mm copper pads for rated power dissipation. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in enclosed industrial enclosures without active cooling. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (cathode-biased during clamping) | Connected to protected line's ground or low-side reference; forms current path during reverse transient. |
| Cathode | Clamping control terminal (banded end) | Connected to protected line's supply or signal rail; reverse voltage applied here triggers avalanche breakdown. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without derating in standard layouts. |
| 32.4 V clamping at 18.5 A | Keeps downstream 24 V logic or microcontroller I/O pins below absolute maximum ratings during surge events. |
| Glass-passivated junction | Ensures long-term stability of VBR and low leakage (<1 µA) across temperature and lifetime. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
| Halogen-free, RoHS-compliant (M3) | Fulfills environmental compliance for industrial and automotive-tier supply chains requiring restricted substance reporting. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback sensors against back-EMF spikes from brushed DC motors. IC Role / Device Role / Timing Role: Unidirectional TVS placed across MOSFET source-drain or op-amp inputs to clamp inductive kick. Use Value: Limits transient voltage to ≤32.4 V, preventing latch-up or oxide damage in 3.3 V/5 V signal conditioning circuits. |
Use Scenario: Surge suppression on LIN bus lines and power supply inputs in door module ECUs. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V rail and LIN transceiver VCC, absorbing load dump and ISO 7637-2 pulses. Use Value: Withstands 100 A surge (8.3 ms) and maintains <1 µA leakage at 13.5 V, ensuring low quiescent current compliance. |
| Programmable Logic Controllers | Industrial IoT Sensor Nodes |
|
Use Scenario: Input protection for analog current loop (4–20 mA) receivers exposed to field wiring transients. IC Role / Device Role / Timing Role: Series-connected TVS on input shunt resistor node, referenced to isolated ground. Use Value: Clamps fast-rising transients within 1 ns response time while adding <1 pF capacitance - no signal integrity impact. |
Use Scenario: ESD and surge hardening of RS-485 transceivers and ADC reference inputs in wireless sensor hubs. IC Role / Device Role / Timing Role: Bidirectional-capable layout (though SMBJ20A-M3/52 is unidirectional) used with polarity-aware routing. Use Value: 600 W rating handles multiple contact ESD events (IEC 61000-4-2 ±8 kV) without degradation over 10k cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A-E3/52 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | No difference in circuit function; differs only in material compliance (halogen content). | Select E3 for cost-sensitive commercial designs where halogen-free certification is not required. |
| SMBJ20CA-M3/52 | Bidirectional variant; symmetric VBR (22.2–24.5 V) in both polarities; same VC and PPPM. | Required for AC-coupled or floating signal lines (e.g., Ethernet PHY, audio differential pairs) where polarity reversal occurs. | Choose SMBJ20CA-M3/52 only if bidirectional clamping is needed; unidirectional SMBJ20A-M3/52 is optimal for DC rails. |
Compared with SMBJ20A-E3/52, the M3 version adds halogen-free compliance without performance trade-offs; versus SMBJ20CA-M3/52, the unidirectional SMBJ20A-M3/52 offers lower leakage and avoids unnecessary bidirectional conduction in DC-biased systems.
Availability
SMBJ20A-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and programmable logic controllers requiring stable component supply with halogen-free compliance and MSL Level 1 reflow support.
Supply support for SMBJ20A-M3/52 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 high-volume manufacturability.
The SMBJ series targets board-level transient protection in harsh environments, delivering standardized 600 W surge capability in compact SMB packages for automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SMBJ20A-M3/52 at its rated peak pulse current?
The SMBJ20A-M3/52 has a maximum clamping voltage (VC) of 32.4 V at 18.5 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ20A-M3/52 maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C) when mounted on recommended 5.0 mm × 5.0 mm copper pads.
Is SMBJ20A-M3/52 suitable for automotive applications?
SMBJ20A-M3/52 is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes (e.g., SMBJ20A-HM3/52); the standard M3 suffix denotes commercial-grade halogen-free RoHS compliance but not automotive qualification. For body control modules or infotainment power rails requiring automotive qualification, specify the HM3 variant. The SMBJ20A-M3/52 itself remains suitable for non-automotive industrial applications with equivalent surge and thermal demands.
How does the M3 suffix differ from E3 in SMBJ20A-M3/52?
The M3 suffix in SMBJ20A-M3/52 indicates halogen-free, RoHS-compliant construction, whereas E3 denotes RoHS-compliant but non-halogen-free material. Both share identical electrical specifications, package dimensions, and thermal performance. The SMBJ20A-M3/52 meets stricter environmental requirements for markets mandating halogen-free substances (e.g., certain EU industrial standards), while SMBJ20A-E3/52 serves general-purpose commercial applications where halogen content is unrestricted.
What is the maximum reverse leakage current for SMBJ20A-M3/52 at its stand-off voltage?
The SMBJ20A-M3/52 exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 20 V stand-off voltage (VWM) and 25 °C ambient temperature. This low leakage ensures minimal power loss in always-on circuits and preserves battery life in low-power industrial sensors. Leakage remains below 5 µA up to +85 °C, verified per Vishay's characterization data for the SMBJ family.
Can SMBJ20A-M3/52 be used in bidirectional signal protection?
No - SMBJ20A-M3/52 is a unidirectional TVS diode, intended for DC-biased lines where clamping is required only in reverse polarity. For bidirectional signal paths (e.g., RS-485, USB, audio), use the SMBJ20CA-M3/52 variant, which provides symmetrical clamping in both directions. Using SMBJ20A-M3/52 on AC-coupled lines risks forward conduction and potential damage; its cathode band must be oriented toward the higher-potential rail in all applications.
SMBJ20A-M3/52 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ20A-M3/52 FAQ
1.How can I place an order for SMBJ20A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20A-M3/52 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 SMBJ20A-M3/52 reliable?
The price and inventory of SMBJ20A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20A-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ20A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20A-M3/52?
SMBJ20A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20A-M3/52 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 SMBJ20A-M3/52?
For technical support, including SMBJ20A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20A-M3/52 requirements.
6.How does Aetrix verify that SMBJ20A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ20A-M3/52 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 SMBJ20A-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ20A-M3/52?
All SMBJ20A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20A-M3/52, 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 SMBJ20A-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ20A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20A-M3/52 Tags
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