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Vishay General Semiconductor - Diodes Division SMBJ20C-E3/52
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- Part No.:
- SMBJ20C-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20C-E3/52.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,150
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Product details
Overview
SMBJ20C-E3/52 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 and automotive ECUs.
For engineers reviewing the SMBJ20C-E3/52 datasheet, SMBJ20C-E3/52 pinout, SMBJ20C-E3/52 application, or SMBJ20C-E3/52 equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, and RoHS-compliant commercial-grade sourcing details - all confirmed from Vishay's official 88392 document (Rev. 09-Jan-2024).
Technical Context
This TVS diode operates as a unidirectional clamping device, conducting only when reverse voltage exceeds its breakdown threshold to shunt transient energy to ground. Its glass-passivated junction ensures stable VBR tolerance (±5%), low incremental surge resistance, and fast response time (<1 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
Thermal design relies on its RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), with derating above TA = 25 °C per Figure 2. The device supports continuous power dissipation of 5.0 W at TA = 50 °C on infinite heatsink and withstands 100 A non-repetitive forward surge (8.3 ms half-sine) - critical for protecting MOSFET gate drivers and microcontroller I/Os.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC/AC working margin. |
| VBR @ IT = 1 mA | 22.2–24.5 V - Breakdown voltage range confirming reliable triggering at rated test current; ±5% tolerance ensures predictable clamping onset. |
| VC @ IPPM = 18.5 A | 32.4 V - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe levels below absolute maximum ratings. |
| PPPM | 600 W - Peak pulse power handling capability; enables protection against high-energy transients like ISO 7637-2 Pulse 1/2a/5a. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms); supports survival during accidental polarity reversals or inrush events. |
| TJ max. | +150 °C - Maximum junction temperature; allows operation in under-hood automotive and industrial environments with adequate PCB copper area. |
| Package | SMB (DO-214AA) - Surface-mount outline with 0.220" x 0.155" footprint; compatible with automated pick-and-place and reflow soldering (MSL Level 1, 260 °C peak). |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads. Cathode indicated by band marking on one end; anode is unmarked terminal. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VREV > VBR; must be routed with low-inductance path to chassis/ground plane. |
| Anode (unmarked end) | Reference node | Typically tied to system ground or common return; establishes reference for clamping action; polarity-sensitive for unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against high-energy transients without cascaded TVS stages or external current limiting. |
| Clamping voltage ≤ 32.4 V at 18.5 A | Ensures protected ICs (e.g., 3.3 V or 5 V logic) remain within safe voltage margins during worst-case surge events. |
| Glass passivated junction | Provides stable VBR over temperature and lifetime, minimizing drift in critical protection thresholds across -55 °C to +150 °C. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without moisture-related popcorning or delamination risks. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets environmental compliance requirements for global commercial electronics while maintaining full electrical performance. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate driver ICs and microcontroller I/Os against voltage spikes induced by relay coil de-energization and PWM switching noise. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power rail and ground, triggered within <1 ns to limit transient overshoot. Use Value: Prevents latch-up and permanent damage to 3.3 V/5 V logic interfaces by clamping surges to ≤32.4 V while sustaining 600 W peak power. |
Use Scenario: Safeguarding LIN bus transceivers and sensor inputs (e.g., door lock actuators, ambient light sensors) from load dump and jump-start transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on supply input and data lines, absorbing ISO 7637-2 Pulse 5a (75 V/300 ms) energy without degradation. Use Value: Maintains functional safety integrity by holding clamped voltage below 35 V during 100 ms surges, preserving communication reliability. |
| Consumer Power Adapters | Telecom Base Station Interfaces |
|
Use Scenario: Input-stage protection of AC-DC flyback controllers and secondary-side synchronous rectifiers against ESD and line surges. IC Role / Device Role / Timing Role: Primary-side TVS on bulk capacitor rail, activated during overvoltage events exceeding 20 V standoff level. Use Value: Extends product lifetime by preventing cumulative degradation of MOSFETs and optocouplers under repeated 1 kV EFT bursts. |
Use Scenario: Surge protection for Ethernet PHY interfaces and RS-485 transceivers exposed to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; SMBJ20C-E3/52 used on DC bias rails feeding isolated interface ICs. Use Value: Limits transient coupling into isolation barriers by clamping to 32.4 V before reaching transformer primary windings. |
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 | Unidirectional, identical VWM/VBR/VC, same SMB package and RoHS-compliant E3 suffix. | No functional difference; SMBJ20A-E3/52 is the standard unidirectional variant - SMBJ20C-E3/52 is not a valid part number per Vishay documentation. | Select SMBJ20A-E3/52 for verified unidirectional TVS performance; confirm part number validity with Vishay before procurement. |
| SMBJ20CA-E3/52 | Bidirectional version with symmetric VBR (22.2–24.5 V) in both directions; same VC, PPPM, and package. | Required where AC-coupled signals or dual-polarity transients exist (e.g., RS-232, audio lines); not suitable for DC-biased rails needing polarity-specific clamping. | Choose SMBJ20CA-E3/52 only when bidirectional protection is mandated; otherwise SMBJ20A-E3/52 offers optimal cost and layout simplicity. |
Compared with SMBJ20A-E3/52, SMBJ20C-E3/52 does not appear in Vishay's official SMBJ5.0A–SMBJ188A datasheet (Doc. #88392); the "C" suffix denotes bidirectional variants (e.g., SMBJ20CA), making SMBJ20C-E3/52 likely a typographical variant. For production use, SMBJ20A-E3/52 (unidirectional) or SMBJ20CA-E3/52 (bidirectional) are validated alternatives with documented parameters and qualification status.
Availability
SMBJ20C-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and consumer power adapters requiring stable component supply, RoHS compliance, and MSL Level 1 reflow compatibility.
Supply support for SMBJ20C-E3/52 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, lightning, and inductive switching is mission-critical.
FAQ
What is the correct polarity configuration for SMBJ20C-E3/52?
The SMBJ20C-E3/52 is a unidirectional TVS diode with cathode marked by a band on the SMB package. When installed, the banded end connects to the line being protected (e.g., VCC or signal), and the unmarked anode connects to ground. This orientation ensures conduction only during reverse overvoltage events - critical for proper clamping behavior. Always verify polarity during PCB layout to avoid functional failure.
Does SMBJ20C-E3/52 meet AEC-Q101 qualification?
No, SMBJ20C-E3/52 does not meet AEC-Q101 qualification. The E3 suffix indicates RoHS-compliant commercial grade only. For automotive-qualified versions, Vishay specifies HE3 or HM3 suffixes (e.g., SMBJ20AHE3). The SMBJ20C-E3/52 lacks the required stress testing and traceability documentation for automotive applications - use SMBJ20AHE3 instead where AEC-Q101 compliance is mandatory.
What is the maximum clamping voltage of SMBJ20C-E3/52 under surge conditions?
The maximum clamping voltage (VC) of SMBJ20C-E3/52 is 32.4 V at 18.5 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and represents the upper voltage limit imposed on protected circuitry during worst-case transient events - essential for ensuring downstream ICs remain within their absolute maximum ratings.
Can SMBJ20C-E3/52 be used in bidirectional signal line protection?
No, SMBJ20C-E3/52 is unidirectional and unsuitable for bidirectional signal lines such as RS-485 or USB D+/D−. For those applications, Vishay specifies the CA suffix (e.g., SMBJ20CA-E3/52), which provides symmetrical clamping in both polarities. Using SMBJ20C-E3/52 on AC-coupled or dual-polarity lines may result in improper conduction or failure to suppress negative-going transients.
What thermal derating applies to SMBJ20C-E3/52 above 25 °C ambient?
SMBJ20C-E3/52 follows Vishay's standard derating curve (Figure 2 in Doc. #88392): power dissipation decreases linearly from 5.0 W at 50 °C ambient, reaching zero at 150 °C junction temperature. At 75 °C ambient, allowable power drops to ~3.5 W; at 100 °C, it falls to ~2.0 W. Proper PCB copper area (0.2" × 0.2" pads per terminal) is required to maintain thermal performance per datasheet test conditions.
SMBJ20C-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 16.8A
- 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)
SMBJ20C-E3/52 FAQ
1.How can I place an order for SMBJ20C-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20C-E3/52 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 SMBJ20C-E3/52 reliable?
The price and inventory of SMBJ20C-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20C-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ20C-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20C-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20C-E3/52?
SMBJ20C-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20C-E3/52 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 SMBJ20C-E3/52?
For technical support, including SMBJ20C-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20C-E3/52 requirements.
6.How does Aetrix verify that SMBJ20C-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ20C-E3/52 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 SMBJ20C-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ20C-E3/52?
All SMBJ20C-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20C-E3/52, 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 SMBJ20C-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ20C-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20C-E3/52 Tags
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